JComponent,
* you must place the component in a containment hierarchy
* whose root is a top-level Swing container.
* Top-level Swing containers --
* such as JFrame, JDialog,
* and JApplet --
* are specialized components
* that provide a place for other Swing components to paint themselves.
* For an explanation of containment hierarchies, see
* Swing Components and the Containment Hierarchy,
* a section in The Java Tutorial.
*
*
* The JComponent class provides:
*
JComponent contains all of the methods in the
* Accessible interface,
* but it doesn't actually implement the interface. That is the
* responsibility of the individual classes
* that extend JComponent.
* JComponent.
*
* JComponent and its subclasses document default values
* for certain properties. For example, JTable documents the
* default row height as 16. Each JComponent subclass
* that has a ComponentUI will create the
* ComponentUI as part of its constructor. In order
* to provide a particular look and feel each
* ComponentUI may set properties back on the
* JComponent that created it. For example, a custom
* look and feel may require JTables to have a row
* height of 24. The documented defaults are the value of a property
* BEFORE the ComponentUI has been installed. If you
* need a specific value for a particular property you should
* explicitly set it.
*
* In release 1.4, the focus subsystem was rearchitected. * For more information, see * * How to Use the Focus Subsystem, * a section in The Java Tutorial. *
* Warning: Swing is not thread safe. For more * information see Swing's Threading * Policy. *
* Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeansTM
* has been added to the
* The default value for this is false, but some
* This is a bound property.
*
* @param value whether or not the JPopupMenu is inherited
* @see #setComponentPopupMenu
* @beaninfo
* bound: true
* description: Whether or not the JPopupMenu is inherited
* @since 1.5
*/
public void setInheritsPopupMenu(boolean value) {
boolean oldValue = getFlag(INHERITS_POPUP_MENU);
setFlag(INHERITS_POPUP_MENU, value);
firePropertyChange("inheritsPopupMenu", oldValue, value);
}
/**
* Returns true if the JPopupMenu should be inherited from the parent.
*
* @see #setComponentPopupMenu
* @since 1.5
*/
public boolean getInheritsPopupMenu() {
return getFlag(INHERITS_POPUP_MENU);
}
/**
* Sets the
* If
* This is a bound property.
*
* @param popup - the popup that will be assigned to this component
* may be null
* @see #getComponentPopupMenu
* @beaninfo
* bound: true
* preferred: true
* description: Popup to show
* @since 1.5
*/
public void setComponentPopupMenu(JPopupMenu popup) {
if(popup != null) {
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
JPopupMenu oldPopup = this.popupMenu;
this.popupMenu = popup;
firePropertyChange("componentPopupMenu", oldPopup, popup);
}
/**
* Returns
* Additionally
* If you override this in a subclass you should not make permanent
* changes to the passed in
* The passed in
* If you override this in a subclass you should not make permanent
* changes to the passed in
* This method actually delegates the work of painting to three
* protected methods:
* Alternatively, or for components that delegate painting to other objects,
* you can query during painting whether or not the component is in the
* midst of a print operation. The
* This method sets the component's state such that the double buffer
* will not be used: painting will be done directly on the passed in
*
* You can detect changes in the value of this property by listening for
* property change events on this component with name
*
* Note: This method provides complimentary functionality to that provided
* by other high level Swing printing APIs. However, it deals strictly with
* painting and should not be confused as providing information on higher
* level print processes. For example, a {@link javax.swing.JTable#print()}
* operation doesn't necessarily result in a continuous rendering of the
* full component, and the return value of this method can change multiple
* times during that operation. It is even possible for the component to be
* painted to the screen while the printing process is ongoing. In such a
* case, the return value of this method is
* Changes this
* Overrides the default
* Returns the
* Please see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial,
* for more information.
*
* @param requestFocusEnabled indicates whether you want this
*
* Please see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial,
* for more information.
*
* @return
* Note that the use of this method is discouraged because
* its behavior is platform dependent. Instead we recommend the
* use of {@link #requestFocusInWindow() requestFocusInWindow()}.
* If you would like more information on focus, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
*
* @see java.awt.Component#requestFocusInWindow()
* @see java.awt.Component#requestFocusInWindow(boolean)
* @since 1.4
*/
public void requestFocus() {
super.requestFocus();
}
/**
* Requests that this
* Note that the use of this method is discouraged because
* its behavior is platform dependent. Instead we recommend the
* use of {@link #requestFocusInWindow(boolean)
* requestFocusInWindow(boolean)}.
* If you would like more information on focus, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
*
* @param temporary boolean indicating if the focus change is temporary
* @return
* If you would like more information on focus, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
*
* @return
* If you would like more information on focus, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
*
* @param temporary boolean indicating if the focus change is temporary
* @return
* This method is intended for use by focus implementations. Client code
* should not use this method; instead, it should use
*
* Although technically you can set the border on any object
* that inherits from
* This is a bound property.
*
* @param border the border to be rendered for this component
* @see Border
* @see CompoundBorder
* @beaninfo
* bound: true
* preferred: true
* attribute: visualUpdate true
* description: The component's border.
*/
public void setBorder(Border border) {
Border oldBorder = this.border;
this.border = border;
firePropertyChange("border", oldBorder, border);
if (border != oldBorder) {
if (border == null || oldBorder == null ||
!(border.getBorderInsets(this).equals(oldBorder.getBorderInsets(this)))) {
revalidate();
}
repaint();
}
}
/**
* Returns the border of this component or
* Register a new keyboard action.
*
* The
* The
* The combination of keystrokes and conditions lets you define high
* level (semantic) action events for a specified keystroke+modifier
* combination (using the KeyStroke class) and direct to a parent or
* child of a component that has the focus, or to the component itself.
* In other words, in any hierarchical structure of components, an
* arbitrary key-combination can be immediately directed to the
* appropriate component in the hierarchy, and cause a specific method
* to be invoked (usually by way of adapter objects).
*
* If an action has already been registered for the receiving
* container, with the same charCode and the same modifiers,
*
* Unregisters a keyboard action.
* This will remove the binding from the
* For Java 2 platform v1.3, a
* This method calls into the
* This method calls into the
* Requests focus on this Note: Disabling a component does not disable its children.
*
* Note: Disabling a lightweight component does not prevent it from
* receiving MouseEvents.
*
* @param enabled true if this component should be enabled, false otherwise
* @see java.awt.Component#isEnabled
* @see java.awt.Component#isLightweight
*
* @beaninfo
* preferred: true
* bound: true
* attribute: visualUpdate true
* description: The enabled state of the component.
*/
public void setEnabled(boolean enabled) {
boolean oldEnabled = isEnabled();
super.setEnabled(enabled);
firePropertyChange("enabled", oldEnabled, enabled);
if (enabled != oldEnabled) {
repaint();
}
}
/**
* Sets the foreground color of this component. It is up to the
* look and feel to honor this property, some may choose to ignore
* it.
*
* @param fg the desired foreground
* It is up to the look and feel to honor this property, some may
* choose to ignore it.
*
* @param bg the desired background
* This method is implemented to do nothing. Subclasses would
* normally override this method if they process some
* key events themselves. If the event is processed,
* it should be consumed.
*/
protected void processComponentKeyEvent(KeyEvent e) {
}
/** Overrides
* See How to Use Tool Tips
* in The Java Tutorial
* for further documentation.
*
* @param text the string to display; if the text is
* If the new {@code TransferHandler} is not {@code null}, this method
* also installs a new {@code DropTarget} on the component to
* activate drop handling through the {@code TransferHandler} and activate
* any built-in support (such as calculating and displaying potential drop
* locations). If you do not wish for this component to respond in any way
* to drops, you can disable drop support entirely either by removing the
* drop target ({@code setDropTarget(null)}) or by de-activating it
* ({@code getDropTaget().setActive(false)}).
*
* If the new {@code TransferHandler} is {@code null}, this method removes
* the drop target.
*
* Under two circumstances, this method does not modify the drop target:
* First, if the existing drop target on this component was explicitly
* set by the developer to a {@code non-null} value. Second, if the
* system property {@code suppressSwingDropSupport} is {@code true}. The
* default value for the system property is {@code false}.
*
* Please see
*
* How to Use Drag and Drop and Data Transfer,
* a section in The Java Tutorial, for more information.
*
* @param newHandler the new {@code TransferHandler}
*
* @see TransferHandler
* @see #getTransferHandler
* @since 1.4
* @beaninfo
* bound: true
* hidden: true
* description: Mechanism for transfer of data to and from the component
*/
public void setTransferHandler(TransferHandler newHandler) {
TransferHandler oldHandler = (TransferHandler)getClientProperty(
JComponent_TRANSFER_HANDLER);
putClientProperty(JComponent_TRANSFER_HANDLER, newHandler);
SwingUtilities.installSwingDropTargetAsNecessary(this, newHandler);
firePropertyChange("transferHandler", oldHandler, newHandler);
}
/**
* Gets the
* Let's say that on the first call to this method the component decides
* to save some state (because it is about to use the selection to show
* a drop index). It can return a state object to the caller encapsulating
* any saved selection state. On a second call, let's say the drop location
* is being changed to something else. The component doesn't need to
* restore anything yet, so it simply passes back the same state object
* to have the DnD system continue storing it. Finally, let's say this
* method is messaged with
* Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeansTM
* has been added to the
* The
* The
* This method may throw a {@code ClassCastException} if any {@code Object}
* in {@code keystrokes} is not an {@code AWTKeyStroke}.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @param keystrokes the Set of AWTKeyStroke for the specified operation
* @see java.awt.KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
* @see java.awt.KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
* @see java.awt.KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes
* contains null, or if any keystroke represents a KEY_TYPED event,
* or if any keystroke already maps to another focus traversal
* operation for this Component
* @since 1.5
* @beaninfo
* bound: true
*/
public void
setFocusTraversalKeys(int id, Set keystrokes)
{
if (id == KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS) {
setFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET,true);
} else if (id == KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS) {
setFlag(FOCUS_TRAVERSAL_KEYS_BACKWARD_SET,true);
}
super.setFocusTraversalKeys(id,keystrokes);
}
/* --- Transitional java.awt.Component Support ---
* The methods and fields in this section will migrate to
* java.awt.Component in the next JDK release.
*/
/**
* Returns true if this component is lightweight, that is, if it doesn't
* have a native window system peer.
*
* @return true if this component is lightweight
*/
@SuppressWarnings("deprecation")
public static boolean isLightweightComponent(Component c) {
return c.getPeer() instanceof LightweightPeer;
}
/**
* @deprecated As of JDK 5,
* replaced by
* Moves and resizes this component.
*
* @param x the new horizontal location
* @param y the new vertical location
* @param w the new width
* @param h the new height
* @see java.awt.Component#setBounds
*/
@Deprecated
public void reshape(int x, int y, int w, int h) {
super.reshape(x, y, w, h);
}
/**
* Stores the bounds of this component into "return value"
*
* An opaque component paints every pixel within its
* rectangular bounds. A non-opaque component paints only a subset of
* its pixels or none at all, allowing the pixels underneath it to
* "show through". Therefore, a component that does not fully paint
* its pixels provides a degree of transparency.
*
* Subclasses that guarantee to always completely paint their contents
* should override this method and return true.
*
* @return true if this component is completely opaque
* @see #setOpaque
*/
public boolean isOpaque() {
return getFlag(IS_OPAQUE);
}
/**
* If true the component paints every pixel within its bounds.
* Otherwise, the component may not paint some or all of its
* pixels, allowing the underlying pixels to show through.
*
* The default value of this property is false for
*
* You can specify the
* Calls
* This method will automatically be called on this component
* when a property value changes such that size, location, or
* internal layout of this component has been affected. This automatic
* updating differs from the AWT because programs generally no
* longer need to invoke
*
* @see java.awt.Component#invalidate
* @see java.awt.Container#validate
* @see #isValidateRoot
* @see RepaintManager#addInvalidComponent
*/
public void revalidate() {
if (getParent() == null) {
// Note: We don't bother invalidating here as once added
// to a valid parent invalidate will be invoked (addImpl
// invokes addNotify which will invoke invalidate on the
// new Component). Also, if we do add a check to isValid
// here it can potentially be called before the constructor
// which was causing some people grief.
return;
}
if (SwingUtilities.isEventDispatchThread()) {
invalidate();
RepaintManager.currentManager(this).addInvalidComponent(this);
}
else {
// To avoid a flood of Runnables when constructing GUIs off
// the EDT, a flag is maintained as to whether or not
// a Runnable has been scheduled.
synchronized(this) {
if (getFlag(REVALIDATE_RUNNABLE_SCHEDULED)) {
return;
}
setFlag(REVALIDATE_RUNNABLE_SCHEDULED, true);
}
Runnable callRevalidate = new Runnable() {
public void run() {
synchronized(JComponent.this) {
setFlag(REVALIDATE_RUNNABLE_SCHEDULED, false);
}
revalidate();
}
};
SwingUtilities.invokeLater(callRevalidate);
}
}
/**
* If this method returns true,
* It's rarely necessary to call this method. In most cases it's
* more efficient to call repaint, which defers the actual painting
* and can collapse redundant requests into a single paint call.
* This method is useful if one needs to update the display while
* the current event is being dispatched.
*
* This method is to be overridden when the dirty region needs to be changed
* for components that are painting origins.
*
* @param x the x value of the region to be painted
* @param y the y value of the region to be painted
* @param w the width of the region to be painted
* @param h the height of the region to be painted
* @see #repaint
* @see #isPaintingOrigin()
*/
public void paintImmediately(int x,int y,int w, int h) {
Component c = this;
Component parent;
if(!isShowing()) {
return;
}
JComponent paintingOigin = SwingUtilities.getPaintingOrigin(this);
if (paintingOigin != null) {
Rectangle rectangle = SwingUtilities.convertRectangle(
c, new Rectangle(x, y, w, h), paintingOigin);
paintingOigin.paintImmediately(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
return;
}
while(!c.isOpaque()) {
parent = c.getParent();
if(parent != null) {
x += c.getX();
y += c.getY();
c = parent;
} else {
break;
}
if(!(c instanceof JComponent)) {
break;
}
}
if(c instanceof JComponent) {
((JComponent)c)._paintImmediately(x,y,w,h);
} else {
c.repaint(x,y,w,h);
}
}
/**
* Paints the specified region now.
*
* @param r a
* As each component is read in we keep track of the current set of
* root components here, in the roots vector. Note that there's only one
* java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see KeyStroke
* @see Action
* @see #setBorder
* @see #registerKeyboardAction
* @see JOptionPane
* @see #setDebugGraphicsOptions
* @see #setToolTipText
* @see #setAutoscrolls
*
* @author Hans Muller
* @author Arnaud Weber
*/
public abstract class JComponent extends Container implements Serializable,
TransferHandler.HasGetTransferHandler
{
/**
* @see #getUIClassID
* @see #writeObject
*/
private static final String uiClassID = "ComponentUI";
/**
* @see #readObject
*/
private static final Hashtable_paintImmediately.
* Will indicate the child that initiated the painting operation.
* If paintingChild is opaque, no need to paint
* any child components after paintingChild.
* Test used in paintChildren.
*/
transient Component paintingChild;
/**
* Constant used for registerKeyboardAction that
* means that the command should be invoked when
* the component has the focus.
*/
public static final int WHEN_FOCUSED = 0;
/**
* Constant used for registerKeyboardAction that
* means that the command should be invoked when the receiving
* component is an ancestor of the focused component or is
* itself the focused component.
*/
public static final int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT = 1;
/**
* Constant used for registerKeyboardAction that
* means that the command should be invoked when
* the receiving component is in the window that has the focus
* or is itself the focused component.
*/
public static final int WHEN_IN_FOCUSED_WINDOW = 2;
/**
* Constant used by some of the APIs to mean that no condition is defined.
*/
public static final int UNDEFINED_CONDITION = -1;
/**
* The key used by JComponent to access keyboard bindings.
*/
private static final String KEYBOARD_BINDINGS_KEY = "_KeyboardBindings";
/**
* An array of KeyStrokes used for
* WHEN_IN_FOCUSED_WINDOW are stashed
* in the client properties under this string.
*/
private static final String WHEN_IN_FOCUSED_WINDOW_BINDINGS = "_WhenInFocusedWindow";
/**
* The comment to display when the cursor is over the component,
* also known as a "value tip", "flyover help", or "flyover label".
*/
public static final String TOOL_TIP_TEXT_KEY = "ToolTipText";
private static final String NEXT_FOCUS = "nextFocus";
/**
* JPopupMenu assigned to this component
* and all of its childrens
*/
private JPopupMenu popupMenu;
/** Private flags **/
private static final int IS_DOUBLE_BUFFERED = 0;
private static final int ANCESTOR_USING_BUFFER = 1;
private static final int IS_PAINTING_TILE = 2;
private static final int IS_OPAQUE = 3;
private static final int KEY_EVENTS_ENABLED = 4;
private static final int FOCUS_INPUTMAP_CREATED = 5;
private static final int ANCESTOR_INPUTMAP_CREATED = 6;
private static final int WIF_INPUTMAP_CREATED = 7;
private static final int ACTIONMAP_CREATED = 8;
private static final int CREATED_DOUBLE_BUFFER = 9;
// bit 10 is free
private static final int IS_PRINTING = 11;
private static final int IS_PRINTING_ALL = 12;
private static final int IS_REPAINTING = 13;
/** Bits 14-21 are used to handle nested writeObject calls. **/
private static final int WRITE_OBJ_COUNTER_FIRST = 14;
private static final int RESERVED_1 = 15;
private static final int RESERVED_2 = 16;
private static final int RESERVED_3 = 17;
private static final int RESERVED_4 = 18;
private static final int RESERVED_5 = 19;
private static final int RESERVED_6 = 20;
private static final int WRITE_OBJ_COUNTER_LAST = 21;
private static final int REQUEST_FOCUS_DISABLED = 22;
private static final int INHERITS_POPUP_MENU = 23;
private static final int OPAQUE_SET = 24;
private static final int AUTOSCROLLS_SET = 25;
private static final int FOCUS_TRAVERSAL_KEYS_FORWARD_SET = 26;
private static final int FOCUS_TRAVERSAL_KEYS_BACKWARD_SET = 27;
private static final int REVALIDATE_RUNNABLE_SCHEDULED = 28;
/**
* Temporary rectangles.
*/
private static java.util.ListWHEN_FOCUSED bindings. */
private InputMap focusInputMap;
/** Used for WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings. */
private InputMap ancestorInputMap;
/** Used for WHEN_IN_FOCUSED_KEY bindings. */
private ComponentInputMap windowInputMap;
/** ActionMap. */
private ActionMap actionMap;
/** Key used to store the default locale in an AppContext **/
private static final String defaultLocale = "JComponent.defaultLocale";
private static Component componentObtainingGraphicsFrom;
private static Object componentObtainingGraphicsFromLock = new
StringBuilder("componentObtainingGraphicsFrom");
/**
* AA text hints.
*/
transient private Object aaTextInfo;
static Graphics safelyGetGraphics(Component c) {
return safelyGetGraphics(c, SwingUtilities.getRoot(c));
}
static Graphics safelyGetGraphics(Component c, Component root) {
synchronized(componentObtainingGraphicsFromLock) {
componentObtainingGraphicsFrom = root;
Graphics g = c.getGraphics();
componentObtainingGraphicsFrom = null;
return g;
}
}
static void getGraphicsInvoked(Component root) {
if (!JComponent.isComponentObtainingGraphicsFrom(root)) {
JRootPane rootPane = ((RootPaneContainer)root).getRootPane();
if (rootPane != null) {
rootPane.disableTrueDoubleBuffering();
}
}
}
/**
* Returns true if {@code c} is the component the graphics is being
* requested of. This is intended for use when getGraphics is invoked.
*/
private static boolean isComponentObtainingGraphicsFrom(Component c) {
synchronized(componentObtainingGraphicsFromLock) {
return (componentObtainingGraphicsFrom == c);
}
}
/**
* Returns the Set of KeyStrokes to use if the component
* is managing focus for forward focus traversal.
*/
static SetKeyStrokes to use if the component
* is managing focus for backward focus traversal.
*/
static SetgetComponentPopupMenu should delegate
* to the parent if this component does not have a JPopupMenu
* assigned to it.
* JComponent
* subclasses that are implemented as a number of JComponents
* may set this to true.
* JPopupMenu for this JComponent.
* The UI is responsible for registering bindings and adding the necessary
* listeners such that the JPopupMenu will be shown at
* the appropriate time. When the JPopupMenu is shown
* depends upon the look and feel: some may show it on a mouse event,
* some may enable a key binding.
* popup is null, and getInheritsPopupMenu
* returns true, then getComponentPopupMenu will be delegated
* to the parent. This provides for a way to make all child components
* inherit the popupmenu of the parent.
* JPopupMenu that assigned for this component.
* If this component does not have a JPopupMenu assigned
* to it and getInheritsPopupMenu is true, this
* will return getParent().getComponentPopupMenu() (assuming
* the parent is valid.)
*
* @return JPopupMenu assigned for this component
* or null if no popup assigned
* @see #setComponentPopupMenu
* @since 1.5
*/
public JPopupMenu getComponentPopupMenu() {
if(!getInheritsPopupMenu()) {
return popupMenu;
}
if(popupMenu == null) {
// Search parents for its popup
Container parent = getParent();
while (parent != null) {
if(parent instanceof JComponent) {
return ((JComponent)parent).getComponentPopupMenu();
}
if(parent instanceof Window ||
parent instanceof Applet) {
// Reached toplevel, break and return null
break;
}
parent = parent.getParent();
}
return null;
}
return popupMenu;
}
/**
* Default JComponent constructor. This constructor does
* very little initialization beyond calling the Container
* constructor. For example, the initial layout manager is
* null. It does, however, set the component's locale
* property to the value returned by
* JComponent.getDefaultLocale.
*
* @see #getDefaultLocale
*/
public JComponent() {
super();
// We enable key events on all JComponents so that accessibility
// bindings will work everywhere. This is a partial fix to BugID
// 4282211.
enableEvents(AWTEvent.KEY_EVENT_MASK);
if (isManagingFocus()) {
LookAndFeel.installProperty(this,
"focusTraversalKeysForward",
getManagingFocusForwardTraversalKeys());
LookAndFeel.installProperty(this,
"focusTraversalKeysBackward",
getManagingFocusBackwardTraversalKeys());
}
super.setLocale( JComponent.getDefaultLocale() );
}
/**
* Resets the UI property to a value from the current look and feel.
* JComponent subclasses must override this method
* like this:
*
* public void updateUI() {
* setUI((SliderUI)UIManager.getUI(this);
* }
*
*
* @see #setUI
* @see UIManager#getLookAndFeel
* @see UIManager#getUI
*/
public void updateUI() {}
/**
* Sets the look and feel delegate for this component.
* JComponent subclasses generally override this method
* to narrow the argument type. For example, in JSlider:
*
* public void setUI(SliderUI newUI) {
* super.setUI(newUI);
* }
*
* JComponent subclasses must provide a
* getUI method that returns the correct type. For example:
*
* public SliderUI getUI() {
* return (SliderUI)ui;
* }
*
*
* @param newUI the new UI delegate
* @see #updateUI
* @see UIManager#getLookAndFeel
* @see UIManager#getUI
* @beaninfo
* bound: true
* hidden: true
* attribute: visualUpdate true
* description: The component's look and feel delegate.
*/
protected void setUI(ComponentUI newUI) {
/* We do not check that the UI instance is different
* before allowing the switch in order to enable the
* same UI instance *with different default settings*
* to be installed.
*/
uninstallUIAndProperties();
// aaText shouldn't persist between look and feels, reset it.
aaTextInfo =
UIManager.getDefaults().get(SwingUtilities2.AA_TEXT_PROPERTY_KEY);
ComponentUI oldUI = ui;
ui = newUI;
if (ui != null) {
ui.installUI(this);
}
firePropertyChange("UI", oldUI, newUI);
revalidate();
repaint();
}
/**
* Uninstalls the UI, if any, and any client properties designated
* as being specific to the installed UI - instances of
* {@code UIClientPropertyKey}.
*/
private void uninstallUIAndProperties() {
if (ui != null) {
ui.uninstallUI(this);
//clean UIClientPropertyKeys from client properties
if (clientProperties != null) {
synchronized(clientProperties) {
Object[] clientPropertyKeys =
clientProperties.getKeys(null);
if (clientPropertyKeys != null) {
for (Object key : clientPropertyKeys) {
if (key instanceof UIClientPropertyKey) {
putClientProperty(key, null);
}
}
}
}
}
}
}
/**
* Returns the UIDefaults key used to
* look up the name of the swing.plaf.ComponentUI
* class that defines the look and feel
* for this component. Most applications will never need to
* call this method. Subclasses of JComponent that support
* pluggable look and feel should override this method to
* return a UIDefaults key that maps to the
* ComponentUI subclass that defines their look and feel.
*
* @return the UIDefaults key for a
* ComponentUI subclass
* @see UIDefaults#getUI
* @beaninfo
* expert: true
* description: UIClassID
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Returns the graphics object used to paint this component.
* If DebugGraphics is turned on we create a new
* DebugGraphics object if necessary.
* Otherwise we just configure the
* specified graphics object's foreground and font.
*
* @param g the original Graphics object
* @return a Graphics object configured for this component
*/
protected Graphics getComponentGraphics(Graphics g) {
Graphics componentGraphics = g;
if (ui != null && DEBUG_GRAPHICS_LOADED) {
if ((DebugGraphics.debugComponentCount() != 0) &&
(shouldDebugGraphics() != 0) &&
!(g instanceof DebugGraphics)) {
componentGraphics = new DebugGraphics(g,this);
}
}
componentGraphics.setColor(getForeground());
componentGraphics.setFont(getFont());
return componentGraphics;
}
/**
* Calls the UI delegate's paint method, if the UI delegate
* is non-null. We pass the delegate a copy of the
* Graphics object to protect the rest of the
* paint code from irrevocable changes
* (for example, Graphics.translate).
* Graphics. For example, you
* should not alter the clip Rectangle or modify the
* transform. If you need to do these operations you may find it
* easier to create a new Graphics from the passed in
* Graphics and manipulate it. Further, if you do not
* invoker super's implementation you must honor the opaque property,
* that is
* if this component is opaque, you must completely fill in the background
* in a non-opaque color. If you do not honor the opaque property you
* will likely see visual artifacts.
* Graphics object might
* have a transform other than the identify transform
* installed on it. In this case, you might get
* unexpected results if you cumulatively apply
* another transform.
*
* @param g the Graphics object to protect
* @see #paint
* @see ComponentUI
*/
protected void paintComponent(Graphics g) {
if (ui != null) {
Graphics scratchGraphics = (g == null) ? null : g.create();
try {
ui.update(scratchGraphics, this);
}
finally {
scratchGraphics.dispose();
}
}
}
/**
* Paints this component's children.
* If shouldUseBuffer is true,
* no component ancestor has a buffer and
* the component children can use a buffer if they have one.
* Otherwise, one ancestor has a buffer currently in use and children
* should not use a buffer to paint.
* @param g the Graphics context in which to paint
* @see #paint
* @see java.awt.Container#paint
*/
protected void paintChildren(Graphics g) {
Graphics sg = g;
synchronized(getTreeLock()) {
int i = getComponentCount() - 1;
if (i < 0) {
return;
}
// If we are only to paint to a specific child, determine
// its index.
if (paintingChild != null &&
(paintingChild instanceof JComponent) &&
paintingChild.isOpaque()) {
for (; i >= 0; i--) {
if (getComponent(i) == paintingChild){
break;
}
}
}
Rectangle tmpRect = fetchRectangle();
boolean checkSiblings = (!isOptimizedDrawingEnabled() &&
checkIfChildObscuredBySibling());
Rectangle clipBounds = null;
if (checkSiblings) {
clipBounds = sg.getClipBounds();
if (clipBounds == null) {
clipBounds = new Rectangle(0, 0, getWidth(),
getHeight());
}
}
boolean printing = getFlag(IS_PRINTING);
final Window window = SwingUtilities.getWindowAncestor(this);
final boolean isWindowOpaque = window == null || window.isOpaque();
for (; i >= 0 ; i--) {
Component comp = getComponent(i);
if (comp == null) {
continue;
}
final boolean isJComponent = comp instanceof JComponent;
// Enable painting of heavyweights in non-opaque windows.
// See 6884960
if ((!isWindowOpaque || isJComponent ||
isLightweightComponent(comp)) && comp.isVisible())
{
Rectangle cr;
cr = comp.getBounds(tmpRect);
boolean hitClip = g.hitClip(cr.x, cr.y, cr.width,
cr.height);
if (hitClip) {
if (checkSiblings && i > 0) {
int x = cr.x;
int y = cr.y;
int width = cr.width;
int height = cr.height;
SwingUtilities.computeIntersection
(clipBounds.x, clipBounds.y,
clipBounds.width, clipBounds.height, cr);
if(getObscuredState(i, cr.x, cr.y, cr.width,
cr.height) == COMPLETELY_OBSCURED) {
continue;
}
cr.x = x;
cr.y = y;
cr.width = width;
cr.height = height;
}
Graphics cg = sg.create(cr.x, cr.y, cr.width,
cr.height);
cg.setColor(comp.getForeground());
cg.setFont(comp.getFont());
boolean shouldSetFlagBack = false;
try {
if(isJComponent) {
if(getFlag(ANCESTOR_USING_BUFFER)) {
((JComponent)comp).setFlag(
ANCESTOR_USING_BUFFER,true);
shouldSetFlagBack = true;
}
if(getFlag(IS_PAINTING_TILE)) {
((JComponent)comp).setFlag(
IS_PAINTING_TILE,true);
shouldSetFlagBack = true;
}
if(!printing) {
comp.paint(cg);
}
else {
if (!getFlag(IS_PRINTING_ALL)) {
comp.print(cg);
}
else {
comp.printAll(cg);
}
}
} else {
// The component is either lightweight, or
// heavyweight in a non-opaque window
if (!printing) {
comp.paint(cg);
}
else {
if (!getFlag(IS_PRINTING_ALL)) {
comp.print(cg);
}
else {
comp.printAll(cg);
}
}
}
} finally {
cg.dispose();
if(shouldSetFlagBack) {
((JComponent)comp).setFlag(
ANCESTOR_USING_BUFFER,false);
((JComponent)comp).setFlag(
IS_PAINTING_TILE,false);
}
}
}
}
}
recycleRectangle(tmpRect);
}
}
/**
* Paints the component's border.
* Graphics. For example, you
* should not alter the clip Rectangle or modify the
* transform. If you need to do these operations you may find it
* easier to create a new Graphics from the passed in
* Graphics and manipulate it.
*
* @param g the Graphics context in which to paint
*
* @see #paint
* @see #setBorder
*/
protected void paintBorder(Graphics g) {
Border border = getBorder();
if (border != null) {
border.paintBorder(this, g, 0, 0, getWidth(), getHeight());
}
}
/**
* Calls paint. Doesn't clear the background but see
* ComponentUI.update, which is called by
* paintComponent.
*
* @param g the Graphics context in which to paint
* @see #paint
* @see #paintComponent
* @see javax.swing.plaf.ComponentUI
*/
public void update(Graphics g) {
paint(g);
}
/**
* Invoked by Swing to draw components.
* Applications should not invoke paint directly,
* but should instead use the repaint method to
* schedule the component for redrawing.
* paintComponent,
* paintBorder,
* and paintChildren. They're called in the order
* listed to ensure that children appear on top of component itself.
* Generally speaking, the component and its children should not
* paint in the insets area allocated to the border. Subclasses can
* just override this method, as always. A subclass that just
* wants to specialize the UI (look and feel) delegate's
* paint method should just override
* paintComponent.
*
* @param g the Graphics context in which to paint
* @see #paintComponent
* @see #paintBorder
* @see #paintChildren
* @see #getComponentGraphics
* @see #repaint
*/
public void paint(Graphics g) {
boolean shouldClearPaintFlags = false;
if ((getWidth() <= 0) || (getHeight() <= 0)) {
return;
}
Graphics componentGraphics = getComponentGraphics(g);
Graphics co = componentGraphics.create();
try {
RepaintManager repaintManager = RepaintManager.currentManager(this);
Rectangle clipRect = co.getClipBounds();
int clipX;
int clipY;
int clipW;
int clipH;
if (clipRect == null) {
clipX = clipY = 0;
clipW = getWidth();
clipH = getHeight();
}
else {
clipX = clipRect.x;
clipY = clipRect.y;
clipW = clipRect.width;
clipH = clipRect.height;
}
if(clipW > getWidth()) {
clipW = getWidth();
}
if(clipH > getHeight()) {
clipH = getHeight();
}
if(getParent() != null && !(getParent() instanceof JComponent)) {
adjustPaintFlags();
shouldClearPaintFlags = true;
}
int bw,bh;
boolean printing = getFlag(IS_PRINTING);
if (!printing && repaintManager.isDoubleBufferingEnabled() &&
!getFlag(ANCESTOR_USING_BUFFER) && isDoubleBuffered() &&
(getFlag(IS_REPAINTING) || repaintManager.isPainting()))
{
repaintManager.beginPaint();
try {
repaintManager.paint(this, this, co, clipX, clipY, clipW,
clipH);
} finally {
repaintManager.endPaint();
}
}
else {
// Will ocassionaly happen in 1.2, especially when printing.
if (clipRect == null) {
co.setClip(clipX, clipY, clipW, clipH);
}
if (!rectangleIsObscured(clipX,clipY,clipW,clipH)) {
if (!printing) {
paintComponent(co);
paintBorder(co);
}
else {
printComponent(co);
printBorder(co);
}
}
if (!printing) {
paintChildren(co);
}
else {
printChildren(co);
}
}
} finally {
co.dispose();
if(shouldClearPaintFlags) {
setFlag(ANCESTOR_USING_BUFFER,false);
setFlag(IS_PAINTING_TILE,false);
setFlag(IS_PRINTING,false);
setFlag(IS_PRINTING_ALL,false);
}
}
}
// paint forcing use of the double buffer. This is used for historical
// reasons: JViewport, when scrolling, previously directly invoked paint
// while turning off double buffering at the RepaintManager level, this
// codes simulates that.
void paintForceDoubleBuffered(Graphics g) {
RepaintManager rm = RepaintManager.currentManager(this);
Rectangle clip = g.getClipBounds();
rm.beginPaint();
setFlag(IS_REPAINTING, true);
try {
rm.paint(this, this, g, clip.x, clip.y, clip.width, clip.height);
} finally {
rm.endPaint();
setFlag(IS_REPAINTING, false);
}
}
/**
* Returns true if this component, or any of its ancestors, are in
* the processing of painting.
*/
boolean isPainting() {
Container component = this;
while (component != null) {
if (component instanceof JComponent &&
((JComponent)component).getFlag(ANCESTOR_USING_BUFFER)) {
return true;
}
component = component.getParent();
}
return false;
}
private void adjustPaintFlags() {
JComponent jparent;
Container parent;
for(parent = getParent() ; parent != null ; parent =
parent.getParent()) {
if(parent instanceof JComponent) {
jparent = (JComponent) parent;
if(jparent.getFlag(ANCESTOR_USING_BUFFER))
setFlag(ANCESTOR_USING_BUFFER, true);
if(jparent.getFlag(IS_PAINTING_TILE))
setFlag(IS_PAINTING_TILE, true);
if(jparent.getFlag(IS_PRINTING))
setFlag(IS_PRINTING, true);
if(jparent.getFlag(IS_PRINTING_ALL))
setFlag(IS_PRINTING_ALL, true);
break;
}
}
}
/**
* Invoke this method to print the component. This method invokes
* print on the component.
*
* @param g the Graphics context in which to paint
* @see #print
* @see #printComponent
* @see #printBorder
* @see #printChildren
*/
public void printAll(Graphics g) {
setFlag(IS_PRINTING_ALL, true);
try {
print(g);
}
finally {
setFlag(IS_PRINTING_ALL, false);
}
}
/**
* Invoke this method to print the component to the specified
* Graphics. This method will result in invocations
* of printComponent, printBorder and
* printChildren. It is recommended that you override
* one of the previously mentioned methods rather than this one if
* your intention is to customize the way printing looks. However,
* it can be useful to override this method should you want to prepare
* state before invoking the superclass behavior. As an example,
* if you wanted to change the component's background color before
* printing, you could do the following:
*
* public void print(Graphics g) {
* Color orig = getBackground();
* setBackground(Color.WHITE);
*
* // wrap in try/finally so that we always restore the state
* try {
* super.print(g);
* } finally {
* setBackground(orig);
* }
* }
*
* isPaintingForPrint method provides
* this ability and its return value will be changed by this method: to
* true immediately before rendering and to false
* immediately after. With each change a property change event is fired on
* this component with the name "paintingForPrint".
* Graphics.
*
* @param g the Graphics context in which to paint
* @see #printComponent
* @see #printBorder
* @see #printChildren
* @see #isPaintingForPrint
*/
public void print(Graphics g) {
setFlag(IS_PRINTING, true);
firePropertyChange("paintingForPrint", false, true);
try {
paint(g);
}
finally {
setFlag(IS_PRINTING, false);
firePropertyChange("paintingForPrint", true, false);
}
}
/**
* This is invoked during a printing operation. This is implemented to
* invoke paintComponent on the component. Override this
* if you wish to add special painting behavior when printing.
*
* @param g the Graphics context in which to paint
* @see #print
* @since 1.3
*/
protected void printComponent(Graphics g) {
paintComponent(g);
}
/**
* Prints this component's children. This is implemented to invoke
* paintChildren on the component. Override this if you
* wish to print the children differently than painting.
*
* @param g the Graphics context in which to paint
* @see #print
* @since 1.3
*/
protected void printChildren(Graphics g) {
paintChildren(g);
}
/**
* Prints the component's border. This is implemented to invoke
* paintBorder on the component. Override this if you
* wish to print the border differently that it is painted.
*
* @param g the Graphics context in which to paint
* @see #print
* @since 1.3
*/
protected void printBorder(Graphics g) {
paintBorder(g);
}
/**
* Returns true if the component is currently painting a tile.
* If this method returns true, paint will be called again for another
* tile. This method returns false if you are not painting a tile or
* if the last tile is painted.
* Use this method to keep some state you might need between tiles.
*
* @return true if the component is currently painting a tile,
* false otherwise
*/
public boolean isPaintingTile() {
return getFlag(IS_PAINTING_TILE);
}
/**
* Returns true if the current painting operation on this
* component is part of a print operation. This method is
* useful when you want to customize what you print versus what you show
* on the screen.
* "paintingForPrint".
* true when, and only
* when, the table is being painted as part of the printing process.
*
* @return true if the current painting operation on this component
* is part of a print operation
* @see #print
* @since 1.6
*/
public final boolean isPaintingForPrint() {
return getFlag(IS_PRINTING);
}
/**
* In release 1.4, the focus subsystem was rearchitected.
* For more information, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
* JComponent's focus traversal keys to
* CTRL+TAB and CTRL+SHIFT+TAB. Also prevents
* SortingFocusTraversalPolicy from considering descendants
* of this JComponent when computing a focus traversal cycle.
*
* @see java.awt.Component#setFocusTraversalKeys
* @see SortingFocusTraversalPolicy
* @deprecated As of 1.4, replaced by
* Component.setFocusTraversalKeys(int, Set) and
* Container.setFocusCycleRoot(boolean).
*/
@Deprecated
public boolean isManagingFocus() {
return false;
}
private void registerNextFocusableComponent() {
registerNextFocusableComponent(getNextFocusableComponent());
}
private void registerNextFocusableComponent(Component
nextFocusableComponent) {
if (nextFocusableComponent == null) {
return;
}
Container nearestRoot =
(isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
FocusTraversalPolicy policy = nearestRoot.getFocusTraversalPolicy();
if (!(policy instanceof LegacyGlueFocusTraversalPolicy)) {
policy = new LegacyGlueFocusTraversalPolicy(policy);
nearestRoot.setFocusTraversalPolicy(policy);
}
((LegacyGlueFocusTraversalPolicy)policy).
setNextFocusableComponent(this, nextFocusableComponent);
}
private void deregisterNextFocusableComponent() {
Component nextFocusableComponent = getNextFocusableComponent();
if (nextFocusableComponent == null) {
return;
}
Container nearestRoot =
(isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
if (nearestRoot == null) {
return;
}
FocusTraversalPolicy policy = nearestRoot.getFocusTraversalPolicy();
if (policy instanceof LegacyGlueFocusTraversalPolicy) {
((LegacyGlueFocusTraversalPolicy)policy).
unsetNextFocusableComponent(this, nextFocusableComponent);
}
}
/**
* In release 1.4, the focus subsystem was rearchitected.
* For more information, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
* FocusTraversalPolicy for this
* JComponent's focus traversal cycle by unconditionally
* setting the specified Component as the next
* Component in the cycle, and this JComponent
* as the specified Component's previous
* Component in the cycle.
*
* @param aComponent the Component that should follow this
* JComponent in the focus traversal cycle
*
* @see #getNextFocusableComponent
* @see java.awt.FocusTraversalPolicy
* @deprecated As of 1.4, replaced by FocusTraversalPolicy
*/
@Deprecated
public void setNextFocusableComponent(Component aComponent) {
boolean displayable = isDisplayable();
if (displayable) {
deregisterNextFocusableComponent();
}
putClientProperty(NEXT_FOCUS, aComponent);
if (displayable) {
registerNextFocusableComponent(aComponent);
}
}
/**
* In release 1.4, the focus subsystem was rearchitected.
* For more information, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
* Component set by a prior call to
* setNextFocusableComponent(Component) on this
* JComponent.
*
* @return the Component that will follow this
* JComponent in the focus traversal cycle, or
* null if none has been explicitly specified
*
* @see #setNextFocusableComponent
* @deprecated As of 1.4, replaced by FocusTraversalPolicy.
*/
@Deprecated
public Component getNextFocusableComponent() {
return (Component)getClientProperty(NEXT_FOCUS);
}
/**
* Provides a hint as to whether or not this JComponent
* should get focus. This is only a hint, and it is up to consumers that
* are requesting focus to honor this property. This is typically honored
* for mouse operations, but not keyboard operations. For example, look
* and feels could verify this property is true before requesting focus
* during a mouse operation. This would often times be used if you did
* not want a mouse press on a JComponent to steal focus,
* but did want the JComponent to be traversable via the
* keyboard. If you do not want this JComponent focusable at
* all, use the setFocusable method instead.
* JComponent to be focusable or not
* @see Focus Specification
* @see java.awt.Component#setFocusable
*/
public void setRequestFocusEnabled(boolean requestFocusEnabled) {
setFlag(REQUEST_FOCUS_DISABLED, !requestFocusEnabled);
}
/**
* Returns true if this JComponent should
* get focus; otherwise returns false.
* true if this component should get focus,
* otherwise returns false
* @see #setRequestFocusEnabled
* @see Focus
* Specification
* @see java.awt.Component#isFocusable
*/
public boolean isRequestFocusEnabled() {
return !getFlag(REQUEST_FOCUS_DISABLED);
}
/**
* Requests that this Component gets the input focus.
* Refer to {@link java.awt.Component#requestFocus()
* Component.requestFocus()} for a complete description of
* this method.
* Component gets the input focus.
* Refer to {@link java.awt.Component#requestFocus(boolean)
* Component.requestFocus(boolean)} for a complete description of
* this method.
* false if the focus change request is guaranteed to
* fail; true if it is likely to succeed
* @see java.awt.Component#requestFocusInWindow()
* @see java.awt.Component#requestFocusInWindow(boolean)
* @since 1.4
*/
public boolean requestFocus(boolean temporary) {
return super.requestFocus(temporary);
}
/**
* Requests that this Component gets the input focus.
* Refer to {@link java.awt.Component#requestFocusInWindow()
* Component.requestFocusInWindow()} for a complete description of
* this method.
* false if the focus change request is guaranteed to
* fail; true if it is likely to succeed
* @see java.awt.Component#requestFocusInWindow()
* @see java.awt.Component#requestFocusInWindow(boolean)
* @since 1.4
*/
public boolean requestFocusInWindow() {
return super.requestFocusInWindow();
}
/**
* Requests that this Component gets the input focus.
* Refer to {@link java.awt.Component#requestFocusInWindow(boolean)
* Component.requestFocusInWindow(boolean)} for a complete description of
* this method.
* false if the focus change request is guaranteed to
* fail; true if it is likely to succeed
* @see java.awt.Component#requestFocusInWindow()
* @see java.awt.Component#requestFocusInWindow(boolean)
* @since 1.4
*/
protected boolean requestFocusInWindow(boolean temporary) {
return super.requestFocusInWindow(temporary);
}
/**
* Requests that this Component get the input focus, and that this
* Component's top-level ancestor become the focused Window. This component
* must be displayable, visible, and focusable for the request to be
* granted.
* requestFocusInWindow().
*
* @see #requestFocusInWindow()
*/
public void grabFocus() {
requestFocus();
}
/**
* Sets the value to indicate whether input verifier for the
* current focus owner will be called before this component requests
* focus. The default is true. Set to false on components such as a
* Cancel button or a scrollbar, which should activate even if the
* input in the current focus owner is not "passed" by the input
* verifier for that component.
*
* @param verifyInputWhenFocusTarget value for the
* verifyInputWhenFocusTarget property
* @see InputVerifier
* @see #setInputVerifier
* @see #getInputVerifier
* @see #getVerifyInputWhenFocusTarget
*
* @since 1.3
* @beaninfo
* bound: true
* description: Whether the Component verifies input before accepting
* focus.
*/
public void setVerifyInputWhenFocusTarget(boolean
verifyInputWhenFocusTarget) {
boolean oldVerifyInputWhenFocusTarget =
this.verifyInputWhenFocusTarget;
this.verifyInputWhenFocusTarget = verifyInputWhenFocusTarget;
firePropertyChange("verifyInputWhenFocusTarget",
oldVerifyInputWhenFocusTarget,
verifyInputWhenFocusTarget);
}
/**
* Returns the value that indicates whether the input verifier for the
* current focus owner will be called before this component requests
* focus.
*
* @return value of the verifyInputWhenFocusTarget property
*
* @see InputVerifier
* @see #setInputVerifier
* @see #getInputVerifier
* @see #setVerifyInputWhenFocusTarget
*
* @since 1.3
*/
public boolean getVerifyInputWhenFocusTarget() {
return verifyInputWhenFocusTarget;
}
/**
* Gets the FontMetrics for the specified Font.
*
* @param font the font for which font metrics is to be
* obtained
* @return the font metrics for font
* @throws NullPointerException if font is null
* @since 1.5
*/
public FontMetrics getFontMetrics(Font font) {
return SwingUtilities2.getFontMetrics(this, font);
}
/**
* Sets the preferred size of this component.
* If preferredSize is null, the UI will
* be asked for the preferred size.
* @beaninfo
* preferred: true
* bound: true
* description: The preferred size of the component.
*/
public void setPreferredSize(Dimension preferredSize) {
super.setPreferredSize(preferredSize);
}
/**
* If the preferredSize has been set to a
* non-null value just returns it.
* If the UI delegate's getPreferredSize
* method returns a non null value then return that;
* otherwise defer to the component's layout manager.
*
* @return the value of the preferredSize property
* @see #setPreferredSize
* @see ComponentUI
*/
@Transient
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
Dimension size = null;
if (ui != null) {
size = ui.getPreferredSize(this);
}
return (size != null) ? size : super.getPreferredSize();
}
/**
* Sets the maximum size of this component to a constant
* value. Subsequent calls to getMaximumSize will always
* return this value; the component's UI will not be asked
* to compute it. Setting the maximum size to null
* restores the default behavior.
*
* @param maximumSize a Dimension containing the
* desired maximum allowable size
* @see #getMaximumSize
* @beaninfo
* bound: true
* description: The maximum size of the component.
*/
public void setMaximumSize(Dimension maximumSize) {
super.setMaximumSize(maximumSize);
}
/**
* If the maximum size has been set to a non-null value
* just returns it. If the UI delegate's getMaximumSize
* method returns a non-null value then return that;
* otherwise defer to the component's layout manager.
*
* @return the value of the maximumSize property
* @see #setMaximumSize
* @see ComponentUI
*/
@Transient
public Dimension getMaximumSize() {
if (isMaximumSizeSet()) {
return super.getMaximumSize();
}
Dimension size = null;
if (ui != null) {
size = ui.getMaximumSize(this);
}
return (size != null) ? size : super.getMaximumSize();
}
/**
* Sets the minimum size of this component to a constant
* value. Subsequent calls to getMinimumSize will always
* return this value; the component's UI will not be asked
* to compute it. Setting the minimum size to null
* restores the default behavior.
*
* @param minimumSize the new minimum size of this component
* @see #getMinimumSize
* @beaninfo
* bound: true
* description: The minimum size of the component.
*/
public void setMinimumSize(Dimension minimumSize) {
super.setMinimumSize(minimumSize);
}
/**
* If the minimum size has been set to a non-null value
* just returns it. If the UI delegate's getMinimumSize
* method returns a non-null value then return that; otherwise
* defer to the component's layout manager.
*
* @return the value of the minimumSize property
* @see #setMinimumSize
* @see ComponentUI
*/
@Transient
public Dimension getMinimumSize() {
if (isMinimumSizeSet()) {
return super.getMinimumSize();
}
Dimension size = null;
if (ui != null) {
size = ui.getMinimumSize(this);
}
return (size != null) ? size : super.getMinimumSize();
}
/**
* Gives the UI delegate an opportunity to define the precise
* shape of this component for the sake of mouse processing.
*
* @return true if this component logically contains x,y
* @see java.awt.Component#contains(int, int)
* @see ComponentUI
*/
public boolean contains(int x, int y) {
return (ui != null) ? ui.contains(this, x, y) : super.contains(x, y);
}
/**
* Sets the border of this component. The Border object is
* responsible for defining the insets for the component
* (overriding any insets set directly on the component) and
* for optionally rendering any border decorations within the
* bounds of those insets. Borders should be used (rather
* than insets) for creating both decorative and non-decorative
* (such as margins and padding) regions for a swing component.
* Compound borders can be used to nest multiple borders within a
* single component.
* JComponent, the look and
* feel implementation of many standard Swing components
* doesn't work well with user-set borders. In general,
* when you want to set a border on a standard Swing
* component other than JPanel or JLabel,
* we recommend that you put the component in a JPanel
* and set the border on the JPanel.
* null if no
* border is currently set.
*
* @return the border object for this component
* @see #setBorder
*/
public Border getBorder() {
return border;
}
/**
* If a border has been set on this component, returns the
* border's insets; otherwise calls super.getInsets.
*
* @return the value of the insets property
* @see #setBorder
*/
public Insets getInsets() {
if (border != null) {
return border.getBorderInsets(this);
}
return super.getInsets();
}
/**
* Returns an Insets object containing this component's inset
* values. The passed-in Insets object will be reused
* if possible.
* Calling methods cannot assume that the same object will be returned,
* however. All existing values within this object are overwritten.
* If insets is null, this will allocate a new one.
*
* @param insets the Insets object, which can be reused
* @return the Insets object
* @see #getInsets
* @beaninfo
* expert: true
*/
public Insets getInsets(Insets insets) {
if (insets == null) {
insets = new Insets(0, 0, 0, 0);
}
if (border != null) {
if (border instanceof AbstractBorder) {
return ((AbstractBorder)border).getBorderInsets(this, insets);
} else {
// Can't reuse border insets because the Border interface
// can't be enhanced.
return border.getBorderInsets(this);
}
} else {
// super.getInsets() always returns an Insets object with
// all of its value zeroed. No need for a new object here.
insets.left = insets.top = insets.right = insets.bottom = 0;
return insets;
}
}
/**
* Overrides Container.getAlignmentY to return
* the horizontal alignment.
*
* @return the value of the alignmentY property
* @see #setAlignmentY
* @see java.awt.Component#getAlignmentY
*/
public float getAlignmentY() {
if (isAlignmentYSet) {
return alignmentY;
}
return super.getAlignmentY();
}
/**
* Sets the the horizontal alignment.
*
* @param alignmentY the new horizontal alignment
* @see #getAlignmentY
* @beaninfo
* description: The preferred vertical alignment of the component.
*/
public void setAlignmentY(float alignmentY) {
this.alignmentY = alignmentY > 1.0f ? 1.0f : alignmentY < 0.0f ? 0.0f : alignmentY;
isAlignmentYSet = true;
}
/**
* Overrides Container.getAlignmentX to return
* the vertical alignment.
*
* @return the value of the alignmentX property
* @see #setAlignmentX
* @see java.awt.Component#getAlignmentX
*/
public float getAlignmentX() {
if (isAlignmentXSet) {
return alignmentX;
}
return super.getAlignmentX();
}
/**
* Sets the the vertical alignment.
*
* @param alignmentX the new vertical alignment
* @see #getAlignmentX
* @beaninfo
* description: The preferred horizontal alignment of the component.
*/
public void setAlignmentX(float alignmentX) {
this.alignmentX = alignmentX > 1.0f ? 1.0f : alignmentX < 0.0f ? 0.0f : alignmentX;
isAlignmentXSet = true;
}
/**
* Sets the input verifier for this component.
*
* @param inputVerifier the new input verifier
* @since 1.3
* @see InputVerifier
* @beaninfo
* bound: true
* description: The component's input verifier.
*/
public void setInputVerifier(InputVerifier inputVerifier) {
InputVerifier oldInputVerifier = (InputVerifier)getClientProperty(
JComponent_INPUT_VERIFIER);
putClientProperty(JComponent_INPUT_VERIFIER, inputVerifier);
firePropertyChange("inputVerifier", oldInputVerifier, inputVerifier);
}
/**
* Returns the input verifier for this component.
*
* @return the inputVerifier property
* @since 1.3
* @see InputVerifier
*/
public InputVerifier getInputVerifier() {
return (InputVerifier)getClientProperty(JComponent_INPUT_VERIFIER);
}
/**
* Returns this component's graphics context, which lets you draw
* on a component. Use this method to get a Graphics object and
* then invoke operations on that object to draw on the component.
* @return this components graphics context
*/
public Graphics getGraphics() {
if (DEBUG_GRAPHICS_LOADED && shouldDebugGraphics() != 0) {
DebugGraphics graphics = new DebugGraphics(super.getGraphics(),
this);
return graphics;
}
return super.getGraphics();
}
/** Enables or disables diagnostic information about every graphics
* operation performed within the component or one of its children.
*
* @param debugOptions determines how the component should display
* the information; one of the following options:
*
*
* ExternalWindow that displays the operations
* performed on the View's offscreen buffer.
* debugOptions is bitwise OR'd into the current value
*
* @beaninfo
* preferred: true
* enum: NONE_OPTION DebugGraphics.NONE_OPTION
* LOG_OPTION DebugGraphics.LOG_OPTION
* FLASH_OPTION DebugGraphics.FLASH_OPTION
* BUFFERED_OPTION DebugGraphics.BUFFERED_OPTION
* description: Diagnostic options for graphics operations.
*/
public void setDebugGraphicsOptions(int debugOptions) {
DebugGraphics.setDebugOptions(this, debugOptions);
}
/** Returns the state of graphics debugging.
*
* @return a bitwise OR'd flag of zero or more of the following options:
*
*
* @see #setDebugGraphicsOptions
*/
public int getDebugGraphicsOptions() {
return DebugGraphics.getDebugOptions(this);
}
/**
* Returns true if debug information is enabled for this
* ExternalWindow that displays the operations
* performed on the View's offscreen buffer.
* JComponent or one of its parents.
*/
int shouldDebugGraphics() {
return DebugGraphics.shouldComponentDebug(this);
}
/**
* This method is now obsolete, please use a combination of
* getActionMap() and getInputMap() for
* similiar behavior. For example, to bind the KeyStroke
* aKeyStroke to the Action anAction
* now use:
*
* component.getInputMap().put(aKeyStroke, aCommand);
* component.getActionMap().put(aCommmand, anAction);
*
* The above assumes you want the binding to be applicable for
* WHEN_FOCUSED. To register bindings for other focus
* states use the getInputMap method that takes an integer.
* anAction will be invoked if a key event matching
* aKeyStroke occurs and aCondition is verified.
* The KeyStroke object defines a
* particular combination of a keyboard key and one or more modifiers
* (alt, shift, ctrl, meta).
* aCommand will be set in the delivered event if
* specified.
* aCondition can be one of:
*
*
*
*
* anAction will replace the action.
*
* @param anAction the Action to be registered
* @param aCommand the command to be set in the delivered event
* @param aKeyStroke the KeyStroke to bind to the action
* @param aCondition the condition that needs to be met, see above
* @see KeyStroke
*/
public void registerKeyboardAction(ActionListener anAction,String aCommand,KeyStroke aKeyStroke,int aCondition) {
InputMap inputMap = getInputMap(aCondition, true);
if (inputMap != null) {
ActionMap actionMap = getActionMap(true);
ActionStandin action = new ActionStandin(anAction, aCommand);
inputMap.put(aKeyStroke, action);
if (actionMap != null) {
actionMap.put(action, action);
}
}
}
/**
* Registers any bound WHEN_IN_FOCUSED_WINDOW actions with
* the KeyboardManager. If onlyIfNew
* is true only actions that haven't been registered are pushed
* to the KeyboardManager;
* otherwise all actions are pushed to the KeyboardManager.
*
* @param onlyIfNew if true, only actions that haven't been registered
* are pushed to the KeyboardManager
*/
private void registerWithKeyboardManager(boolean onlyIfNew) {
InputMap inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW, false);
KeyStroke[] strokes;
HashtableWHEN_IN_FOCUSED_WINDOW KeyStroke bindings.
*/
private void unregisterWithKeyboardManager() {
HashtableComponentInputMap when its bindings change.
* If inputMap is the current windowInputMap
* (or a parent of the window InputMap)
* the KeyboardManager is notified of the new bindings.
*
* @param inputMap the map containing the new bindings
*/
void componentInputMapChanged(ComponentInputMap inputMap) {
InputMap km = getInputMap(WHEN_IN_FOCUSED_WINDOW, false);
while (km != inputMap && km != null) {
km = km.getParent();
}
if (km != null) {
registerWithKeyboardManager(false);
}
}
private void registerWithKeyboardManager(KeyStroke aKeyStroke) {
KeyboardManager.getCurrentManager().registerKeyStroke(aKeyStroke,this);
}
private void unregisterWithKeyboardManager(KeyStroke aKeyStroke) {
KeyboardManager.getCurrentManager().unregisterKeyStroke(aKeyStroke,
this);
}
/**
* This method is now obsolete, please use a combination of
* getActionMap() and getInputMap() for
* similiar behavior.
*/
public void registerKeyboardAction(ActionListener anAction,KeyStroke aKeyStroke,int aCondition) {
registerKeyboardAction(anAction,null,aKeyStroke,aCondition);
}
/**
* This method is now obsolete. To unregister an existing binding
* you can either remove the binding from the
* ActionMap/InputMap, or place a dummy binding the
* InputMap. Removing the binding from the
* InputMap allows bindings in parent InputMaps
* to be active, whereas putting a dummy binding in the
* InputMap effectively disables
* the binding from ever happening.
* ActionMap
* (if it exists) as well as the InputMaps.
*/
public void unregisterKeyboardAction(KeyStroke aKeyStroke) {
ActionMap am = getActionMap(false);
for (int counter = 0; counter < 3; counter++) {
InputMap km = getInputMap(counter, false);
if (km != null) {
Object actionID = km.get(aKeyStroke);
if (am != null && actionID != null) {
am.remove(actionID);
}
km.remove(aKeyStroke);
}
}
}
/**
* Returns the KeyStrokes that will initiate
* registered actions.
*
* @return an array of KeyStroke objects
* @see #registerKeyboardAction
*/
public KeyStroke[] getRegisteredKeyStrokes() {
int[] counts = new int[3];
KeyStroke[][] strokes = new KeyStroke[3][];
for (int counter = 0; counter < 3; counter++) {
InputMap km = getInputMap(counter, false);
strokes[counter] = (km != null) ? km.allKeys() : null;
counts[counter] = (strokes[counter] != null) ?
strokes[counter].length : 0;
}
KeyStroke[] retValue = new KeyStroke[counts[0] + counts[1] +
counts[2]];
for (int counter = 0, last = 0; counter < 3; counter++) {
if (counts[counter] > 0) {
System.arraycopy(strokes[counter], 0, retValue, last,
counts[counter]);
last += counts[counter];
}
}
return retValue;
}
/**
* Returns the condition that determines whether a registered action
* occurs in response to the specified keystroke.
* KeyStroke can be associated
* with more than one condition.
* For example, 'a' could be bound for the two
* conditions WHEN_FOCUSED and
* WHEN_IN_FOCUSED_WINDOW condition.
*
* @return the action-keystroke condition
*/
public int getConditionForKeyStroke(KeyStroke aKeyStroke) {
for (int counter = 0; counter < 3; counter++) {
InputMap inputMap = getInputMap(counter, false);
if (inputMap != null && inputMap.get(aKeyStroke) != null) {
return counter;
}
}
return UNDEFINED_CONDITION;
}
/**
* Returns the object that will perform the action registered for a
* given keystroke.
*
* @return the ActionListener
* object invoked when the keystroke occurs
*/
public ActionListener getActionForKeyStroke(KeyStroke aKeyStroke) {
ActionMap am = getActionMap(false);
if (am == null) {
return null;
}
for (int counter = 0; counter < 3; counter++) {
InputMap inputMap = getInputMap(counter, false);
if (inputMap != null) {
Object actionBinding = inputMap.get(aKeyStroke);
if (actionBinding != null) {
Action action = am.get(actionBinding);
if (action instanceof ActionStandin) {
return ((ActionStandin)action).actionListener;
}
return action;
}
}
}
return null;
}
/**
* Unregisters all the bindings in the first tier InputMaps
* and ActionMap. This has the effect of removing any
* local bindings, and allowing the bindings defined in parent
* InputMap/ActionMaps
* (the UI is usually defined in the second tier) to persist.
*/
public void resetKeyboardActions() {
// Keys
for (int counter = 0; counter < 3; counter++) {
InputMap inputMap = getInputMap(counter, false);
if (inputMap != null) {
inputMap.clear();
}
}
// Actions
ActionMap am = getActionMap(false);
if (am != null) {
am.clear();
}
}
/**
* Sets the InputMap to use under the condition
* condition to
* map. A null value implies you
* do not want any bindings to be used, even from the UI. This will
* not reinstall the UI InputMap (if there was one).
* condition has one of the following values:
*
*
* If WHEN_IN_FOCUSED_WINDOW
* WHEN_FOCUSED
* WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
* condition is WHEN_IN_FOCUSED_WINDOW
* and map is not a ComponentInputMap, an
* IllegalArgumentException will be thrown.
* Similarly, if condition is not one of the values
* listed, an IllegalArgumentException will be thrown.
*
* @param condition one of the values listed above
* @param map the InputMap to use for the given condition
* @exception IllegalArgumentException if condition is
* WHEN_IN_FOCUSED_WINDOW and map
* is not an instance of ComponentInputMap; or
* if condition is not one of the legal values
* specified above
* @since 1.3
*/
public final void setInputMap(int condition, InputMap map) {
switch (condition) {
case WHEN_IN_FOCUSED_WINDOW:
if (map != null && !(map instanceof ComponentInputMap)) {
throw new IllegalArgumentException("WHEN_IN_FOCUSED_WINDOW InputMaps must be of type ComponentInputMap");
}
windowInputMap = (ComponentInputMap)map;
setFlag(WIF_INPUTMAP_CREATED, true);
registerWithKeyboardManager(false);
break;
case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
ancestorInputMap = map;
setFlag(ANCESTOR_INPUTMAP_CREATED, true);
break;
case WHEN_FOCUSED:
focusInputMap = map;
setFlag(FOCUS_INPUTMAP_CREATED, true);
break;
default:
throw new IllegalArgumentException("condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
}
}
/**
* Returns the InputMap that is used during
* condition.
*
* @param condition one of WHEN_IN_FOCUSED_WINDOW, WHEN_FOCUSED,
* WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
* @return the InputMap for the specified
* condition
* @since 1.3
*/
public final InputMap getInputMap(int condition) {
return getInputMap(condition, true);
}
/**
* Returns the InputMap that is used when the
* component has focus.
* This is convenience method for getInputMap(WHEN_FOCUSED).
*
* @return the InputMap used when the component has focus
* @since 1.3
*/
public final InputMap getInputMap() {
return getInputMap(WHEN_FOCUSED, true);
}
/**
* Sets the ActionMap to am. This does not set
* the parent of the am to be the ActionMap
* from the UI (if there was one), it is up to the caller to have done this.
*
* @param am the new ActionMap
* @since 1.3
*/
public final void setActionMap(ActionMap am) {
actionMap = am;
setFlag(ACTIONMAP_CREATED, true);
}
/**
* Returns the ActionMap used to determine what
* Action to fire for particular KeyStroke
* binding. The returned ActionMap, unless otherwise
* set, will have the ActionMap from the UI set as the parent.
*
* @return the ActionMap containing the key/action bindings
* @since 1.3
*/
public final ActionMap getActionMap() {
return getActionMap(true);
}
/**
* Returns the InputMap to use for condition
* condition. If the InputMap hasn't
* been created, and create is
* true, it will be created.
*
* @param condition one of the following values:
*
*
* @param create if true, create the InputMap if it
* is not already created
* @return the InputMap for the given condition;
* if create is false and the InputMap
* hasn't been created, returns null
* @exception IllegalArgumentException if condition
* is not one of the legal values listed above
*/
final InputMap getInputMap(int condition, boolean create) {
switch (condition) {
case WHEN_FOCUSED:
if (getFlag(FOCUS_INPUTMAP_CREATED)) {
return focusInputMap;
}
// Hasn't been created yet.
if (create) {
InputMap km = new InputMap();
setInputMap(condition, km);
return km;
}
break;
case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
if (getFlag(ANCESTOR_INPUTMAP_CREATED)) {
return ancestorInputMap;
}
// Hasn't been created yet.
if (create) {
InputMap km = new InputMap();
setInputMap(condition, km);
return km;
}
break;
case WHEN_IN_FOCUSED_WINDOW:
if (getFlag(WIF_INPUTMAP_CREATED)) {
return windowInputMap;
}
// Hasn't been created yet.
if (create) {
ComponentInputMap km = new ComponentInputMap(this);
setInputMap(condition, km);
return km;
}
break;
default:
throw new IllegalArgumentException("condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
}
return null;
}
/**
* Finds and returns the appropriate ActionMap.
*
* @param create if true, create the ActionMap if it
* is not already created
* @return the ActionMap for this component; if the
* create flag is false and there is no
* current ActionMap, returns null
*/
final ActionMap getActionMap(boolean create) {
if (getFlag(ACTIONMAP_CREATED)) {
return actionMap;
}
// Hasn't been created.
if (create) {
ActionMap am = new ActionMap();
setActionMap(am);
return am;
}
return null;
}
/**
* Returns the baseline. The baseline is measured from the top of
* the component. This method is primarily meant for
* LayoutManagers to align components along their
* baseline. A return value less than 0 indicates this component
* does not have a reasonable baseline and that
* LayoutManagers should not align this component on
* its baseline.
* ComponentUI method of the
* same name. If this component does not have a ComponentUI
* -1 will be returned. If a value >= 0 is
* returned, then the component has a valid baseline for any
* size >= the minimum size and getBaselineResizeBehavior
* can be used to determine how the baseline changes with size.
*
* @throws IllegalArgumentException {@inheritDoc}
* @see #getBaselineResizeBehavior
* @see java.awt.FontMetrics
* @since 1.6
*/
public int getBaseline(int width, int height) {
// check size.
super.getBaseline(width, height);
if (ui != null) {
return ui.getBaseline(this, width, height);
}
return -1;
}
/**
* Returns an enum indicating how the baseline of the component
* changes as the size changes. This method is primarily meant for
* layout managers and GUI builders.
* ComponentUI method of
* the same name. If this component does not have a
* ComponentUI
* BaselineResizeBehavior.OTHER will be
* returned. Subclasses should
* never return null; if the baseline can not be
* calculated return BaselineResizeBehavior.OTHER. Callers
* should first ask for the baseline using
* getBaseline and if a value >= 0 is returned use
* this method. It is acceptable for this method to return a
* value other than BaselineResizeBehavior.OTHER even if
* getBaseline returns a value less than 0.
*
* @see #getBaseline(int, int)
* @since 1.6
*/
public BaselineResizeBehavior getBaselineResizeBehavior() {
if (ui != null) {
return ui.getBaselineResizeBehavior(this);
}
return BaselineResizeBehavior.OTHER;
}
/**
* In release 1.4, the focus subsystem was rearchitected.
* For more information, see
*
* How to Use the Focus Subsystem,
* a section in The Java Tutorial.
* JComponent's
* FocusTraversalPolicy's default Component.
* If this JComponent is a focus cycle root, then its
* FocusTraversalPolicy is used. Otherwise, the
* FocusTraversalPolicy of this JComponent's
* focus-cycle-root ancestor is used.
*
* @see java.awt.FocusTraversalPolicy#getDefaultComponent
* @deprecated As of 1.4, replaced by
* FocusTraversalPolicy.getDefaultComponent(Container).requestFocus()
*/
@Deprecated
public boolean requestDefaultFocus() {
Container nearestRoot =
(isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
if (nearestRoot == null) {
return false;
}
Component comp = nearestRoot.getFocusTraversalPolicy().
getDefaultComponent(nearestRoot);
if (comp != null) {
comp.requestFocus();
return true;
} else {
return false;
}
}
/**
* Makes the component visible or invisible.
* Overrides Component.setVisible.
*
* @param aFlag true to make the component visible; false to
* make it invisible
*
* @beaninfo
* attribute: visualUpdate true
*/
public void setVisible(boolean aFlag) {
if (aFlag != isVisible()) {
super.setVisible(aFlag);
if (aFlag) {
Container parent = getParent();
if (parent != null) {
Rectangle r = getBounds();
parent.repaint(r.x, r.y, r.width, r.height);
}
revalidate();
}
}
}
/**
* Sets whether or not this component is enabled.
* A component that is enabled may respond to user input,
* while a component that is not enabled cannot respond to
* user input. Some components may alter their visual
* representation when they are disabled in order to
* provide feedback to the user that they cannot take input.
* Color
* @see java.awt.Component#getForeground
*
* @beaninfo
* preferred: true
* bound: true
* attribute: visualUpdate true
* description: The foreground color of the component.
*/
public void setForeground(Color fg) {
Color oldFg = getForeground();
super.setForeground(fg);
if ((oldFg != null) ? !oldFg.equals(fg) : ((fg != null) && !fg.equals(oldFg))) {
// foreground already bound in AWT1.2
repaint();
}
}
/**
* Sets the background color of this component. The background
* color is used only if the component is opaque, and only
* by subclasses of JComponent or
* ComponentUI implementations. Direct subclasses of
* JComponent must override
* paintComponent to honor this property.
* Color
* @see java.awt.Component#getBackground
* @see #setOpaque
*
* @beaninfo
* preferred: true
* bound: true
* attribute: visualUpdate true
* description: The background color of the component.
*/
public void setBackground(Color bg) {
Color oldBg = getBackground();
super.setBackground(bg);
if ((oldBg != null) ? !oldBg.equals(bg) : ((bg != null) && !bg.equals(oldBg))) {
// background already bound in AWT1.2
repaint();
}
}
/**
* Sets the font for this component.
*
* @param font the desired Font for this component
* @see java.awt.Component#getFont
*
* @beaninfo
* preferred: true
* bound: true
* attribute: visualUpdate true
* description: The font for the component.
*/
public void setFont(Font font) {
Font oldFont = getFont();
super.setFont(font);
// font already bound in AWT1.2
if (font != oldFont) {
revalidate();
repaint();
}
}
/**
* Returns the default locale used to initialize each JComponent's
* locale property upon creation.
*
* The default locale has "AppContext" scope so that applets (and
* potentially multiple lightweight applications running in a single VM)
* can have their own setting. An applet can safely alter its default
* locale because it will have no affect on other applets (or the browser).
*
* @return the default Locale.
* @see #setDefaultLocale
* @see java.awt.Component#getLocale
* @see #setLocale
* @since 1.4
*/
static public Locale getDefaultLocale() {
Locale l = (Locale) SwingUtilities.appContextGet(defaultLocale);
if( l == null ) {
//REMIND(bcb) choosing the default value is more complicated
//than this.
l = Locale.getDefault();
JComponent.setDefaultLocale( l );
}
return l;
}
/**
* Sets the default locale used to initialize each JComponent's locale
* property upon creation. The initial value is the VM's default locale.
*
* The default locale has "AppContext" scope so that applets (and
* potentially multiple lightweight applications running in a single VM)
* can have their own setting. An applet can safely alter its default
* locale because it will have no affect on other applets (or the browser).
*
* @param l the desired default Locale for new components.
* @see #getDefaultLocale
* @see java.awt.Component#getLocale
* @see #setLocale
* @since 1.4
*/
static public void setDefaultLocale( Locale l ) {
SwingUtilities.appContextPut(defaultLocale, l);
}
/**
* Processes any key events that the component itself
* recognizes. This is called after the focus
* manager and any interested listeners have been
* given a chance to steal away the event. This
* method is called only if the event has not
* yet been consumed. This method is called prior
* to the keyboard UI logic.
* processKeyEvent to process events. **/
protected void processKeyEvent(KeyEvent e) {
boolean result;
boolean shouldProcessKey;
// This gives the key event listeners a crack at the event
super.processKeyEvent(e);
// give the component itself a crack at the event
if (! e.isConsumed()) {
processComponentKeyEvent(e);
}
shouldProcessKey = KeyboardState.shouldProcess(e);
if(e.isConsumed()) {
return;
}
if (shouldProcessKey && processKeyBindings(e, e.getID() ==
KeyEvent.KEY_PRESSED)) {
e.consume();
}
}
/**
* Invoked to process the key bindings for ks as the result
* of the KeyEvent e. This obtains
* the appropriate InputMap,
* gets the binding, gets the action from the ActionMap,
* and then (if the action is found and the component
* is enabled) invokes notifyAction to notify the action.
*
* @param ks the KeyStroke queried
* @param e the KeyEvent
* @param condition one of the following values:
*
*
* @param pressed true if the key is pressed
* @return true if there was a binding to an action, and the action
* was enabled
*
* @since 1.3
*/
protected boolean processKeyBinding(KeyStroke ks, KeyEvent e,
int condition, boolean pressed) {
InputMap map = getInputMap(condition, false);
ActionMap am = getActionMap(false);
if(map != null && am != null && isEnabled()) {
Object binding = map.get(ks);
Action action = (binding == null) ? null : am.get(binding);
if (action != null) {
return SwingUtilities.notifyAction(action, ks, e, this,
e.getModifiers());
}
}
return false;
}
/**
* This is invoked as the result of a KeyEvent
* that was not consumed by the FocusManager,
* KeyListeners, or the component. It will first try
* WHEN_FOCUSED bindings,
* then WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings,
* and finally WHEN_IN_FOCUSED_WINDOW bindings.
*
* @param e the unconsumed KeyEvent
* @param pressed true if the key is pressed
* @return true if there is a key binding for e
*/
boolean processKeyBindings(KeyEvent e, boolean pressed) {
if (!SwingUtilities.isValidKeyEventForKeyBindings(e)) {
return false;
}
// Get the KeyStroke
// There may be two keystrokes associated with a low-level key event;
// in this case a keystroke made of an extended key code has a priority.
KeyStroke ks;
KeyStroke ksE = null;
if (e.getID() == KeyEvent.KEY_TYPED) {
ks = KeyStroke.getKeyStroke(e.getKeyChar());
}
else {
ks = KeyStroke.getKeyStroke(e.getKeyCode(),e.getModifiers(),
(pressed ? false:true));
if (e.getKeyCode() != e.getExtendedKeyCode()) {
ksE = KeyStroke.getKeyStroke(e.getExtendedKeyCode(),e.getModifiers(),
(pressed ? false:true));
}
}
// Do we have a key binding for e?
// If we have a binding by an extended code, use it.
// If not, check for regular code binding.
if(ksE != null && processKeyBinding(ksE, e, WHEN_FOCUSED, pressed)) {
return true;
}
if(processKeyBinding(ks, e, WHEN_FOCUSED, pressed))
return true;
/* We have no key binding. Let's try the path from our parent to the
* window excluded. We store the path components so we can avoid
* asking the same component twice.
*/
Container parent = this;
while (parent != null && !(parent instanceof Window) &&
!(parent instanceof Applet)) {
if(parent instanceof JComponent) {
if(ksE != null && ((JComponent)parent).processKeyBinding(ksE, e,
WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
return true;
if(((JComponent)parent).processKeyBinding(ks, e,
WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
return true;
}
// This is done so that the children of a JInternalFrame are
// given precedence for WHEN_IN_FOCUSED_WINDOW bindings before
// other components WHEN_IN_FOCUSED_WINDOW bindings. This also gives
// more precedence to the WHEN_IN_FOCUSED_WINDOW bindings of the
// JInternalFrame's children vs the
// WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings of the parents.
// maybe generalize from JInternalFrame (like isFocusCycleRoot).
if ((parent instanceof JInternalFrame) &&
JComponent.processKeyBindingsForAllComponents(e,parent,pressed)){
return true;
}
parent = parent.getParent();
}
/* No components between the focused component and the window is
* actually interested by the key event. Let's try the other
* JComponent in this window.
*/
if(parent != null) {
return JComponent.processKeyBindingsForAllComponents(e,parent,pressed);
}
return false;
}
static boolean processKeyBindingsForAllComponents(KeyEvent e,
Container container, boolean pressed) {
while (true) {
if (KeyboardManager.getCurrentManager().fireKeyboardAction(
e, pressed, container)) {
return true;
}
if (container instanceof Popup.HeavyWeightWindow) {
container = ((Window)container).getOwner();
}
else {
return false;
}
}
}
/**
* Registers the text to display in a tool tip.
* The text displays when the cursor lingers over the component.
* null,
* the tool tip is turned off for this component
* @see #TOOL_TIP_TEXT_KEY
* @beaninfo
* preferred: true
* description: The text to display in a tool tip.
*/
public void setToolTipText(String text) {
String oldText = getToolTipText();
putClientProperty(TOOL_TIP_TEXT_KEY, text);
ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
if (text != null) {
if (oldText == null) {
toolTipManager.registerComponent(this);
}
} else {
toolTipManager.unregisterComponent(this);
}
}
/**
* Returns the tooltip string that has been set with
* setToolTipText.
*
* @return the text of the tool tip
* @see #TOOL_TIP_TEXT_KEY
*/
public String getToolTipText() {
return (String)getClientProperty(TOOL_TIP_TEXT_KEY);
}
/**
* Returns the string to be used as the tooltip for event.
* By default this returns any string set using
* setToolTipText. If a component provides
* more extensive API to support differing tooltips at different locations,
* this method should be overridden.
*/
public String getToolTipText(MouseEvent event) {
return getToolTipText();
}
/**
* Returns the tooltip location in this component's coordinate system.
* If null is returned, Swing will choose a location.
* The default implementation returns null.
*
* @param event the MouseEvent that caused the
* ToolTipManager to show the tooltip
* @return always returns null
*/
public Point getToolTipLocation(MouseEvent event) {
return null;
}
/**
* Returns the preferred location to display the popup menu in this
* component's coordinate system. It is up to the look and feel to
* honor this property, some may choose to ignore it.
* If {@code null}, the look and feel will choose a suitable location.
*
* @param event the {@code MouseEvent} that triggered the popup to be
* shown, or {@code null} if the popup is not being shown as the
* result of a mouse event
* @return location to display the {@code JPopupMenu}, or {@code null}
* @since 1.5
*/
public Point getPopupLocation(MouseEvent event) {
return null;
}
/**
* Returns the instance of JToolTip that should be used
* to display the tooltip.
* Components typically would not override this method,
* but it can be used to
* cause different tooltips to be displayed differently.
*
* @return the JToolTip used to display this toolTip
*/
public JToolTip createToolTip() {
JToolTip tip = new JToolTip();
tip.setComponent(this);
return tip;
}
/**
* Forwards the scrollRectToVisible() message to the
* JComponent's parent. Components that can service
* the request, such as JViewport,
* override this method and perform the scrolling.
*
* @param aRect the visible Rectangle
* @see JViewport
*/
public void scrollRectToVisible(Rectangle aRect) {
Container parent;
int dx = getX(), dy = getY();
for (parent = getParent();
!(parent == null) &&
!(parent instanceof JComponent) &&
!(parent instanceof CellRendererPane);
parent = parent.getParent()) {
Rectangle bounds = parent.getBounds();
dx += bounds.x;
dy += bounds.y;
}
if (!(parent == null) && !(parent instanceof CellRendererPane)) {
aRect.x += dx;
aRect.y += dy;
((JComponent)parent).scrollRectToVisible(aRect);
aRect.x -= dx;
aRect.y -= dy;
}
}
/**
* Sets the autoscrolls property.
* If true mouse dragged events will be
* synthetically generated when the mouse is dragged
* outside of the component's bounds and mouse motion
* has paused (while the button continues to be held
* down). The synthetic events make it appear that the
* drag gesture has resumed in the direction established when
* the component's boundary was crossed. Components that
* support autoscrolling must handle mouseDragged
* events by calling scrollRectToVisible with a
* rectangle that contains the mouse event's location. All of
* the Swing components that support item selection and are
* typically displayed in a JScrollPane
* (JTable, JList, JTree,
* JTextArea, and JEditorPane)
* already handle mouse dragged events in this way. To enable
* autoscrolling in any other component, add a mouse motion
* listener that calls scrollRectToVisible.
* For example, given a JPanel, myPanel:
*
* MouseMotionListener doScrollRectToVisible = new MouseMotionAdapter() {
* public void mouseDragged(MouseEvent e) {
* Rectangle r = new Rectangle(e.getX(), e.getY(), 1, 1);
* ((JPanel)e.getSource()).scrollRectToVisible(r);
* }
* };
* myPanel.addMouseMotionListener(doScrollRectToVisible);
*
* The default value of the autoScrolls
* property is false.
*
* @param autoscrolls if true, synthetic mouse dragged events
* are generated when the mouse is dragged outside of a component's
* bounds and the mouse button continues to be held down; otherwise
* false
* @see #getAutoscrolls
* @see JViewport
* @see JScrollPane
*
* @beaninfo
* expert: true
* description: Determines if this component automatically scrolls its contents when dragged.
*/
public void setAutoscrolls(boolean autoscrolls) {
setFlag(AUTOSCROLLS_SET, true);
if (this.autoscrolls != autoscrolls) {
this.autoscrolls = autoscrolls;
if (autoscrolls) {
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
else {
Autoscroller.stop(this);
}
}
}
/**
* Gets the autoscrolls property.
*
* @return the value of the autoscrolls property
* @see JViewport
* @see #setAutoscrolls
*/
public boolean getAutoscrolls() {
return autoscrolls;
}
/**
* Sets the {@code TransferHandler}, which provides support for transfer
* of data into and out of this component via cut/copy/paste and drag
* and drop. This may be {@code null} if the component does not support
* data transfer operations.
* transferHandler property.
*
* @return the value of the transferHandler property
*
* @see TransferHandler
* @see #setTransferHandler
* @since 1.4
*/
public TransferHandler getTransferHandler() {
return (TransferHandler)getClientProperty(JComponent_TRANSFER_HANDLER);
}
/**
* Calculates a custom drop location for this type of component,
* representing where a drop at the given point should insert data.
* null is returned if this component doesn't calculate
* custom drop locations. In this case, TransferHandler
* will provide a default DropLocation containing just
* the point.
*
* @param p the point to calculate a drop location for
* @return the drop location, or null
*/
TransferHandler.DropLocation dropLocationForPoint(Point p) {
return null;
}
/**
* Called to set or clear the drop location during a DnD operation.
* In some cases, the component may need to use its internal selection
* temporarily to indicate the drop location. To help facilitate this,
* this method returns and accepts as a parameter a state object.
* This state object can be used to store, and later restore, the selection
* state. Whatever this method returns will be passed back to it in
* future calls, as the state parameter. If it wants the DnD system to
* continue storing the same state, it must pass it back every time.
* Here's how this is used:
* null. This means DnD
* is finished with this component for now, meaning it should restore
* state. At this point, it can use the state parameter to restore
* said state, and of course return null since there's
* no longer anything to store.
*
* @param location the drop location (as calculated by
* dropLocationForPoint) or null
* if there's no longer a valid drop location
* @param state the state object saved earlier for this component,
* or null
* @param forDrop whether or not the method is being called because an
* actual drop occurred
* @return any saved state for this component, or null if none
*/
Object setDropLocation(TransferHandler.DropLocation location,
Object state,
boolean forDrop) {
return null;
}
/**
* Called to indicate to this component that DnD is done.
* Needed by JTree.
*/
void dndDone() {
}
/**
* Processes mouse events occurring on this component by
* dispatching them to any registered
* MouseListener objects, refer to
* {@link java.awt.Component#processMouseEvent(MouseEvent)}
* for a complete description of this method.
*
* @param e the mouse event
* @see java.awt.Component#processMouseEvent
* @since 1.5
*/
protected void processMouseEvent(MouseEvent e) {
if (autoscrolls && e.getID() == MouseEvent.MOUSE_RELEASED) {
Autoscroller.stop(this);
}
super.processMouseEvent(e);
}
/**
* Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED.
*
* @param e the MouseEvent
* @see MouseEvent
*/
protected void processMouseMotionEvent(MouseEvent e) {
boolean dispatch = true;
if (autoscrolls && e.getID() == MouseEvent.MOUSE_DRAGGED) {
// We don't want to do the drags when the mouse moves if we're
// autoscrolling. It makes it feel spastic.
dispatch = !Autoscroller.isRunning(this);
Autoscroller.processMouseDragged(e);
}
if (dispatch) {
super.processMouseMotionEvent(e);
}
}
// Inner classes can't get at this method from a super class
void superProcessMouseMotionEvent(MouseEvent e) {
super.processMouseMotionEvent(e);
}
/**
* This is invoked by the RepaintManager if
* createImage is called on the component.
*
* @param newValue true if the double buffer image was created from this component
*/
void setCreatedDoubleBuffer(boolean newValue) {
setFlag(CREATED_DOUBLE_BUFFER, newValue);
}
/**
* Returns true if the RepaintManager
* created the double buffer image from the component.
*
* @return true if this component had a double buffer image, false otherwise
*/
boolean getCreatedDoubleBuffer() {
return getFlag(CREATED_DOUBLE_BUFFER);
}
/**
* ActionStandin is used as a standin for
* ActionListeners that are
* added via registerKeyboardAction.
*/
final class ActionStandin implements Action {
private final ActionListener actionListener;
private final String command;
// This will be non-null if actionListener is an Action.
private final Action action;
ActionStandin(ActionListener actionListener, String command) {
this.actionListener = actionListener;
if (actionListener instanceof Action) {
this.action = (Action)actionListener;
}
else {
this.action = null;
}
this.command = command;
}
public Object getValue(String key) {
if (key != null) {
if (key.equals(Action.ACTION_COMMAND_KEY)) {
return command;
}
if (action != null) {
return action.getValue(key);
}
if (key.equals(NAME)) {
return "ActionStandin";
}
}
return null;
}
public boolean isEnabled() {
if (actionListener == null) {
// This keeps the old semantics where
// registerKeyboardAction(null) would essentialy remove
// the binding. We don't remove the binding from the
// InputMap as that would still allow parent InputMaps
// bindings to be accessed.
return false;
}
if (action == null) {
return true;
}
return action.isEnabled();
}
public void actionPerformed(ActionEvent ae) {
if (actionListener != null) {
actionListener.actionPerformed(ae);
}
}
// We don't allow any values to be added.
public void putValue(String key, Object value) {}
// Does nothing, our enabledness is determiend from our asociated
// action.
public void setEnabled(boolean b) { }
public void addPropertyChangeListener
(PropertyChangeListener listener) {}
public void removePropertyChangeListener
(PropertyChangeListener listener) {}
}
// This class is used by the KeyboardState class to provide a single
// instance that can be stored in the AppContext.
static final class IntVector {
int array[] = null;
int count = 0;
int capacity = 0;
int size() {
return count;
}
int elementAt(int index) {
return array[index];
}
void addElement(int value) {
if (count == capacity) {
capacity = (capacity + 2) * 2;
int[] newarray = new int[capacity];
if (count > 0) {
System.arraycopy(array, 0, newarray, 0, count);
}
array = newarray;
}
array[count++] = value;
}
void setElementAt(int value, int index) {
array[index] = value;
}
}
@SuppressWarnings("serial")
static class KeyboardState implements Serializable {
private static final Object keyCodesKey =
JComponent.KeyboardState.class;
// Get the array of key codes from the AppContext.
static IntVector getKeyCodeArray() {
IntVector iv =
(IntVector)SwingUtilities.appContextGet(keyCodesKey);
if (iv == null) {
iv = new IntVector();
SwingUtilities.appContextPut(keyCodesKey, iv);
}
return iv;
}
static void registerKeyPressed(int keyCode) {
IntVector kca = getKeyCodeArray();
int count = kca.size();
int i;
for(i=0;ijava.awt.Component.setEnabled(boolean).
*/
@Deprecated
public void disable() {
if (isEnabled() != false) {
super.disable();
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.ENABLED, null);
}
}
}
/**
* The AccessibleContext associated with this
* JComponent.
*/
protected AccessibleContext accessibleContext = null;
/**
* Returns the AccessibleContext associated with this
* JComponent. The method implemented by this base
* class returns null. Classes that extend JComponent
* should implement this method to return the
* AccessibleContext associated with the subclass.
*
* @return the AccessibleContext of this
* JComponent
*/
public AccessibleContext getAccessibleContext() {
return accessibleContext;
}
/**
* Inner class of JComponent used to provide default support for
* accessibility. This class is not meant to be used directly by
* application developers, but is instead meant only to be
* subclassed by component developers.
* java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*/
public abstract class AccessibleJComponent extends AccessibleAWTContainer
implements AccessibleExtendedComponent
{
/**
* Though the class is abstract, this should be called by
* all sub-classes.
*/
protected AccessibleJComponent() {
super();
}
protected ContainerListener accessibleContainerHandler = null;
protected FocusListener accessibleFocusHandler = null;
/**
* Fire PropertyChange listener, if one is registered,
* when children added/removed.
*/
protected class AccessibleContainerHandler
implements ContainerListener {
public void componentAdded(ContainerEvent e) {
Component c = e.getChild();
if (c != null && c instanceof Accessible) {
AccessibleJComponent.this.firePropertyChange(
AccessibleContext.ACCESSIBLE_CHILD_PROPERTY,
null, c.getAccessibleContext());
}
}
public void componentRemoved(ContainerEvent e) {
Component c = e.getChild();
if (c != null && c instanceof Accessible) {
AccessibleJComponent.this.firePropertyChange(
AccessibleContext.ACCESSIBLE_CHILD_PROPERTY,
c.getAccessibleContext(), null);
}
}
}
/**
* Fire PropertyChange listener, if one is registered,
* when focus events happen
* @since 1.3
*/
protected class AccessibleFocusHandler implements FocusListener {
public void focusGained(FocusEvent event) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.FOCUSED);
}
}
public void focusLost(FocusEvent event) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.FOCUSED, null);
}
}
} // inner class AccessibleFocusHandler
/**
* Adds a PropertyChangeListener to the listener list.
*
* @param listener the PropertyChangeListener to be added
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
if (accessibleFocusHandler == null) {
accessibleFocusHandler = new AccessibleFocusHandler();
JComponent.this.addFocusListener(accessibleFocusHandler);
}
if (accessibleContainerHandler == null) {
accessibleContainerHandler = new AccessibleContainerHandler();
JComponent.this.addContainerListener(accessibleContainerHandler);
}
super.addPropertyChangeListener(listener);
}
/**
* Removes a PropertyChangeListener from the listener list.
* This removes a PropertyChangeListener that was registered
* for all properties.
*
* @param listener the PropertyChangeListener to be removed
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
if (accessibleFocusHandler != null) {
JComponent.this.removeFocusListener(accessibleFocusHandler);
accessibleFocusHandler = null;
}
super.removePropertyChangeListener(listener);
}
/**
* Recursively search through the border hierarchy (if it exists)
* for a TitledBorder with a non-null title. This does a depth
* first search on first the inside borders then the outside borders.
* The assumption is that titles make really pretty inside borders
* but not very pretty outside borders in compound border situations.
* It's rather arbitrary, but hopefully decent UI programmers will
* not create multiple titled borders for the same component.
*/
protected String getBorderTitle(Border b) {
String s;
if (b instanceof TitledBorder) {
return ((TitledBorder) b).getTitle();
} else if (b instanceof CompoundBorder) {
s = getBorderTitle(((CompoundBorder) b).getInsideBorder());
if (s == null) {
s = getBorderTitle(((CompoundBorder) b).getOutsideBorder());
}
return s;
} else {
return null;
}
}
// AccessibleContext methods
//
/**
* Gets the accessible name of this object. This should almost never
* return java.awt.Component.getName(), as that generally isn't
* a localized name, and doesn't have meaning for the user. If the
* object is fundamentally a text object (such as a menu item), the
* accessible name should be the text of the object (for example,
* "save").
* If the object has a tooltip, the tooltip text may also be an
* appropriate String to return.
*
* @return the localized name of the object -- can be null if this
* object does not have a name
* @see AccessibleContext#setAccessibleName
*/
public String getAccessibleName() {
String name = accessibleName;
// fallback to the client name property
//
if (name == null) {
name = (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
}
// fallback to the titled border if it exists
//
if (name == null) {
name = getBorderTitle(getBorder());
}
// fallback to the label labeling us if it exists
//
if (name == null) {
Object o = getClientProperty(JLabel.LABELED_BY_PROPERTY);
if (o instanceof Accessible) {
AccessibleContext ac = ((Accessible) o).getAccessibleContext();
if (ac != null) {
name = ac.getAccessibleName();
}
}
}
return name;
}
/**
* Gets the accessible description of this object. This should be
* a concise, localized description of what this object is - what
* is its meaning to the user. If the object has a tooltip, the
* tooltip text may be an appropriate string to return, assuming
* it contains a concise description of the object (instead of just
* the name of the object - for example a "Save" icon on a toolbar that
* had "save" as the tooltip text shouldn't return the tooltip
* text as the description, but something like "Saves the current
* text document" instead).
*
* @return the localized description of the object -- can be null if
* this object does not have a description
* @see AccessibleContext#setAccessibleDescription
*/
public String getAccessibleDescription() {
String description = accessibleDescription;
// fallback to the client description property
//
if (description == null) {
description = (String)getClientProperty(AccessibleContext.ACCESSIBLE_DESCRIPTION_PROPERTY);
}
// fallback to the tool tip text if it exists
//
if (description == null) {
try {
description = getToolTipText();
} catch (Exception e) {
// Just in case the subclass overrode the
// getToolTipText method and actually
// requires a MouseEvent.
// [[[FIXME: WDW - we probably should require this
// method to take a MouseEvent and just pass it on
// to getToolTipText. The swing-feedback traffic
// leads me to believe getToolTipText might change,
// though, so I was hesitant to make this change at
// this time.]]]
}
}
// fallback to the label labeling us if it exists
//
if (description == null) {
Object o = getClientProperty(JLabel.LABELED_BY_PROPERTY);
if (o instanceof Accessible) {
AccessibleContext ac = ((Accessible) o).getAccessibleContext();
if (ac != null) {
description = ac.getAccessibleDescription();
}
}
}
return description;
}
/**
* Gets the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.SWING_COMPONENT;
}
/**
* Gets the state of this object.
*
* @return an instance of AccessibleStateSet containing the current
* state set of the object
* @see AccessibleState
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleStateSet states = super.getAccessibleStateSet();
if (JComponent.this.isOpaque()) {
states.add(AccessibleState.OPAQUE);
}
return states;
}
/**
* Returns the number of accessible children in the object. If all
* of the children of this object implement Accessible, than this
* method should return the number of children of this object.
*
* @return the number of accessible children in the object.
*/
public int getAccessibleChildrenCount() {
return super.getAccessibleChildrenCount();
}
/**
* Returns the nth Accessible child of the object.
*
* @param i zero-based index of child
* @return the nth Accessible child of the object
*/
public Accessible getAccessibleChild(int i) {
return super.getAccessibleChild(i);
}
// ----- AccessibleExtendedComponent
/**
* Returns the AccessibleExtendedComponent
*
* @return the AccessibleExtendedComponent
*/
AccessibleExtendedComponent getAccessibleExtendedComponent() {
return this;
}
/**
* Returns the tool tip text
*
* @return the tool tip text, if supported, of the object;
* otherwise, null
* @since 1.4
*/
public String getToolTipText() {
return JComponent.this.getToolTipText();
}
/**
* Returns the titled border text
*
* @return the titled border text, if supported, of the object;
* otherwise, null
* @since 1.4
*/
public String getTitledBorderText() {
Border border = JComponent.this.getBorder();
if (border instanceof TitledBorder) {
return ((TitledBorder)border).getTitle();
} else {
return null;
}
}
/**
* Returns key bindings associated with this object
*
* @return the key bindings, if supported, of the object;
* otherwise, null
* @see AccessibleKeyBinding
* @since 1.4
*/
public AccessibleKeyBinding getAccessibleKeyBinding() {
return null;
}
} // inner class AccessibleJComponent
/**
* Returns an ArrayTable used for
* key/value "client properties" for this component. If the
* clientProperties table doesn't exist, an empty one
* will be created.
*
* @return an ArrayTable
* @see #putClientProperty
* @see #getClientProperty
*/
private ArrayTable getClientProperties() {
if (clientProperties == null) {
clientProperties = new ArrayTable();
}
return clientProperties;
}
/**
* Returns the value of the property with the specified key. Only
* properties added with putClientProperty will return
* a non-null value.
*
* @param key the being queried
* @return the value of this property or null
* @see #putClientProperty
*/
public final Object getClientProperty(Object key) {
if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
return aaTextInfo;
} else if (key == SwingUtilities2.COMPONENT_UI_PROPERTY_KEY) {
return ui;
}
if(clientProperties == null) {
return null;
} else {
synchronized(clientProperties) {
return clientProperties.get(key);
}
}
}
/**
* Adds an arbitrary key/value "client property" to this component.
* get/putClientProperty methods provide access to
* a small per-instance hashtable. Callers can use get/putClientProperty
* to annotate components that were created by another module.
* For example, a
* layout manager might store per child constraints this way. For example:
*
* componentA.putClientProperty("to the left of", componentB);
*
* If value is null this method will remove the property.
* Changes to client properties are reported with
* PropertyChange events.
* The name of the property (for the sake of PropertyChange
* events) is key.toString().
* clientProperty dictionary is not intended to
* support large
* scale extensions to JComponent nor should be it considered an
* alternative to subclassing when designing a new component.
*
* @param key the new client property key
* @param value the new client property value; if null
* this method will remove the property
* @see #getClientProperty
* @see #addPropertyChangeListener
*/
public final void putClientProperty(Object key, Object value) {
if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
aaTextInfo = value;
return;
}
if (value == null && clientProperties == null) {
// Both the value and ArrayTable are null, implying we don't
// have to do anything.
return;
}
ArrayTable clientProperties = getClientProperties();
Object oldValue;
synchronized(clientProperties) {
oldValue = clientProperties.get(key);
if (value != null) {
clientProperties.put(key, value);
} else if (oldValue != null) {
clientProperties.remove(key);
} else {
// old == new == null
return;
}
}
clientPropertyChanged(key, oldValue, value);
firePropertyChange(key.toString(), oldValue, value);
}
// Invoked from putClientProperty. This is provided for subclasses
// in Swing.
void clientPropertyChanged(Object key, Object oldValue,
Object newValue) {
}
/*
* Sets the property with the specified name to the specified value if
* the property has not already been set by the client program.
* This method is used primarily to set UI defaults for properties
* with primitive types, where the values cannot be marked with
* UIResource.
* @see LookAndFeel#installProperty
* @param propertyName String containing the name of the property
* @param value Object containing the property value
*/
void setUIProperty(String propertyName, Object value) {
if (propertyName == "opaque") {
if (!getFlag(OPAQUE_SET)) {
setOpaque(((Boolean)value).booleanValue());
setFlag(OPAQUE_SET, false);
}
} else if (propertyName == "autoscrolls") {
if (!getFlag(AUTOSCROLLS_SET)) {
setAutoscrolls(((Boolean)value).booleanValue());
setFlag(AUTOSCROLLS_SET, false);
}
} else if (propertyName == "focusTraversalKeysForward") {
if (!getFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET)) {
super.setFocusTraversalKeys(KeyboardFocusManager.
FORWARD_TRAVERSAL_KEYS,
(SetComponent.setBounds(int, int, int, int).
* rv and returns rv.
* If rv is null a new Rectangle
* is allocated. This version of getBounds is useful
* if the caller wants to avoid allocating a new Rectangle
* object on the heap.
*
* @param rv the return value, modified to the component's bounds
* @return rv; if rv is null
* return a newly created Rectangle with this
* component's bounds
*/
public Rectangle getBounds(Rectangle rv) {
if (rv == null) {
return new Rectangle(getX(), getY(), getWidth(), getHeight());
}
else {
rv.setBounds(getX(), getY(), getWidth(), getHeight());
return rv;
}
}
/**
* Stores the width/height of this component into "return value"
* rv and returns rv.
* If rv is null a new Dimension
* object is allocated. This version of getSize
* is useful if the caller wants to avoid allocating a new
* Dimension object on the heap.
*
* @param rv the return value, modified to the component's size
* @return rv
*/
public Dimension getSize(Dimension rv) {
if (rv == null) {
return new Dimension(getWidth(), getHeight());
}
else {
rv.setSize(getWidth(), getHeight());
return rv;
}
}
/**
* Stores the x,y origin of this component into "return value"
* rv and returns rv.
* If rv is null a new Point
* is allocated. This version of getLocation is useful
* if the caller wants to avoid allocating a new Point
* object on the heap.
*
* @param rv the return value, modified to the component's location
* @return rv
*/
public Point getLocation(Point rv) {
if (rv == null) {
return new Point(getX(), getY());
}
else {
rv.setLocation(getX(), getY());
return rv;
}
}
/**
* Returns the current x coordinate of the component's origin.
* This method is preferable to writing
* component.getBounds().x, or
* component.getLocation().x because it doesn't cause any
* heap allocations.
*
* @return the current x coordinate of the component's origin
*/
public int getX() { return super.getX(); }
/**
* Returns the current y coordinate of the component's origin.
* This method is preferable to writing
* component.getBounds().y, or
* component.getLocation().y because it doesn't cause any
* heap allocations.
*
* @return the current y coordinate of the component's origin
*/
public int getY() { return super.getY(); }
/**
* Returns the current width of this component.
* This method is preferable to writing
* component.getBounds().width, or
* component.getSize().width because it doesn't cause any
* heap allocations.
*
* @return the current width of this component
*/
public int getWidth() { return super.getWidth(); }
/**
* Returns the current height of this component.
* This method is preferable to writing
* component.getBounds().height, or
* component.getSize().height because it doesn't cause any
* heap allocations.
*
* @return the current height of this component
*/
public int getHeight() { return super.getHeight(); }
/**
* Returns true if this component is completely opaque.
* JComponent.
* However, the default value for this property on most standard
* JComponent subclasses (such as JButton and
* JTree) is look-and-feel dependent.
*
* @param isOpaque true if this component should be opaque
* @see #isOpaque
* @beaninfo
* bound: true
* expert: true
* description: The component's opacity
*/
public void setOpaque(boolean isOpaque) {
boolean oldValue = getFlag(IS_OPAQUE);
setFlag(IS_OPAQUE, isOpaque);
setFlag(OPAQUE_SET, true);
firePropertyChange("opaque", oldValue, isOpaque);
}
/**
* If the specified rectangle is completely obscured by any of this
* component's opaque children then returns true. Only direct children
* are considered, more distant descendants are ignored. A
* JComponent is opaque if
* JComponent.isOpaque() returns true, other lightweight
* components are always considered transparent, and heavyweight components
* are always considered opaque.
*
* @param x x value of specified rectangle
* @param y y value of specified rectangle
* @param width width of specified rectangle
* @param height height of specified rectangle
* @return true if the specified rectangle is obscured by an opaque child
*/
boolean rectangleIsObscured(int x,int y,int width,int height)
{
int numChildren = getComponentCount();
for(int i = 0; i < numChildren; i++) {
Component child = getComponent(i);
int cx, cy, cw, ch;
cx = child.getX();
cy = child.getY();
cw = child.getWidth();
ch = child.getHeight();
if (x >= cx && (x + width) <= (cx + cw) &&
y >= cy && (y + height) <= (cy + ch) && child.isVisible()) {
if(child instanceof JComponent) {
// System.out.println("A) checking opaque: " + ((JComponent)child).isOpaque() + " " + child);
// System.out.print("B) ");
// Thread.dumpStack();
return child.isOpaque();
} else {
/** Sometimes a heavy weight can have a bound larger than its peer size
* so we should always draw under heavy weights
*/
return false;
}
}
}
return false;
}
/**
* Returns the Component's "visible rect rectangle" - the
* intersection of the visible rectangles for the component c
* and all of its ancestors. The return value is stored in
* visibleRect.
*
* @param c the component
* @param visibleRect a Rectangle computed as the
* intersection of all visible rectangles for the component
* c and all of its ancestors -- this is the
* return value for this method
* @see #getVisibleRect
*/
static final void computeVisibleRect(Component c, Rectangle visibleRect) {
Container p = c.getParent();
Rectangle bounds = c.getBounds();
if (p == null || p instanceof Window || p instanceof Applet) {
visibleRect.setBounds(0, 0, bounds.width, bounds.height);
} else {
computeVisibleRect(p, visibleRect);
visibleRect.x -= bounds.x;
visibleRect.y -= bounds.y;
SwingUtilities.computeIntersection(0,0,bounds.width,bounds.height,visibleRect);
}
}
/**
* Returns the Component's "visible rect rectangle" - the
* intersection of the visible rectangles for this component
* and all of its ancestors. The return value is stored in
* visibleRect.
*
* @param visibleRect a Rectangle computed as the
* intersection of all visible rectangles for this
* component and all of its ancestors -- this is the return
* value for this method
* @see #getVisibleRect
*/
public void computeVisibleRect(Rectangle visibleRect) {
computeVisibleRect(this, visibleRect);
}
/**
* Returns the Component's "visible rectangle" - the
* intersection of this component's visible rectangle,
* new Rectangle(0, 0, getWidth(), getHeight()),
* and all of its ancestors' visible rectangles.
*
* @return the visible rectangle
*/
public Rectangle getVisibleRect() {
Rectangle visibleRect = new Rectangle();
computeVisibleRect(visibleRect);
return visibleRect;
}
/**
* Support for reporting bound property changes for boolean properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
*/
public void firePropertyChange(String propertyName,
boolean oldValue, boolean newValue) {
super.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Support for reporting bound property changes for integer properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
*/
public void firePropertyChange(String propertyName,
int oldValue, int newValue) {
super.firePropertyChange(propertyName, oldValue, newValue);
}
// XXX This method is implemented as a workaround to a JLS issue with ambiguous
// methods. This should be removed once 4758654 is resolved.
public void firePropertyChange(String propertyName, char oldValue, char newValue) {
super.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Supports reporting constrained property changes.
* This method can be called when a constrained property has changed
* and it will send the appropriate PropertyChangeEvent
* to any registered VetoableChangeListeners.
*
* @param propertyName the name of the property that was listened on
* @param oldValue the old value of the property
* @param newValue the new value of the property
* @exception PropertyVetoException when the attempt to set the
* property is vetoed by the component
*/
protected void fireVetoableChange(String propertyName, Object oldValue, Object newValue)
throws java.beans.PropertyVetoException
{
if (vetoableChangeSupport == null) {
return;
}
vetoableChangeSupport.fireVetoableChange(propertyName, oldValue, newValue);
}
/**
* Adds a VetoableChangeListener to the listener list.
* The listener is registered for all properties.
*
* @param listener the VetoableChangeListener to be added
*/
public synchronized void addVetoableChangeListener(VetoableChangeListener listener) {
if (vetoableChangeSupport == null) {
vetoableChangeSupport = new java.beans.VetoableChangeSupport(this);
}
vetoableChangeSupport.addVetoableChangeListener(listener);
}
/**
* Removes a VetoableChangeListener from the listener list.
* This removes a VetoableChangeListener that was registered
* for all properties.
*
* @param listener the VetoableChangeListener to be removed
*/
public synchronized void removeVetoableChangeListener(VetoableChangeListener listener) {
if (vetoableChangeSupport == null) {
return;
}
vetoableChangeSupport.removeVetoableChangeListener(listener);
}
/**
* Returns an array of all the vetoable change listeners
* registered on this component.
*
* @return all of the component's VetoableChangeListeners
* or an empty
* array if no vetoable change listeners are currently registered
*
* @see #addVetoableChangeListener
* @see #removeVetoableChangeListener
*
* @since 1.4
*/
public synchronized VetoableChangeListener[] getVetoableChangeListeners() {
if (vetoableChangeSupport == null) {
return new VetoableChangeListener[0];
}
return vetoableChangeSupport.getVetoableChangeListeners();
}
/**
* Returns the top-level ancestor of this component (either the
* containing Window or Applet),
* or null if this component has not
* been added to any container.
*
* @return the top-level Container that this component is in,
* or null if not in any container
*/
public Container getTopLevelAncestor() {
for(Container p = this; p != null; p = p.getParent()) {
if(p instanceof Window || p instanceof Applet) {
return p;
}
}
return null;
}
private AncestorNotifier getAncestorNotifier() {
return (AncestorNotifier)
getClientProperty(JComponent_ANCESTOR_NOTIFIER);
}
/**
* Registers listener so that it will receive
* AncestorEvents when it or any of its ancestors
* move or are made visible or invisible.
* Events are also sent when the component or its ancestors are added
* or removed from the containment hierarchy.
*
* @param listener the AncestorListener to register
* @see AncestorEvent
*/
public void addAncestorListener(AncestorListener listener) {
AncestorNotifier ancestorNotifier = getAncestorNotifier();
if (ancestorNotifier == null) {
ancestorNotifier = new AncestorNotifier(this);
putClientProperty(JComponent_ANCESTOR_NOTIFIER,
ancestorNotifier);
}
ancestorNotifier.addAncestorListener(listener);
}
/**
* Unregisters listener so that it will no longer receive
* AncestorEvents.
*
* @param listener the AncestorListener to be removed
* @see #addAncestorListener
*/
public void removeAncestorListener(AncestorListener listener) {
AncestorNotifier ancestorNotifier = getAncestorNotifier();
if (ancestorNotifier == null) {
return;
}
ancestorNotifier.removeAncestorListener(listener);
if (ancestorNotifier.listenerList.getListenerList().length == 0) {
ancestorNotifier.removeAllListeners();
putClientProperty(JComponent_ANCESTOR_NOTIFIER, null);
}
}
/**
* Returns an array of all the ancestor listeners
* registered on this component.
*
* @return all of the component's AncestorListeners
* or an empty
* array if no ancestor listeners are currently registered
*
* @see #addAncestorListener
* @see #removeAncestorListener
*
* @since 1.4
*/
public AncestorListener[] getAncestorListeners() {
AncestorNotifier ancestorNotifier = getAncestorNotifier();
if (ancestorNotifier == null) {
return new AncestorListener[0];
}
return ancestorNotifier.getAncestorListeners();
}
/**
* Returns an array of all the objects currently registered
* as FooListeners
* upon this JComponent.
* FooListeners are registered using the
* addFooListener method.
*
* listenerType argument
* with a class literal,
* such as
* FooListener.class.
* For example, you can query a
* JComponent c
* for its mouse listeners with the following code:
* MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* java.util.EventListener
* @return an array of all objects registered as
* FooListeners on this component,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if listenerType
* doesn't specify a class or interface that implements
* java.util.EventListener
*
* @since 1.3
*
* @see #getVetoableChangeListeners
* @see #getAncestorListeners
*/
public KeyboardAction event listeners.
* This method is called by the toolkit internally and should
* not be called directly by programs.
*
* @see #registerKeyboardAction
*/
public void addNotify() {
super.addNotify();
firePropertyChange("ancestor", null, getParent());
registerWithKeyboardManager(false);
registerNextFocusableComponent();
}
/**
* Notifies this component that it no longer has a parent component.
* When this method is invoked, any KeyboardActions
* set up in the the chain of parent components are removed.
* This method is called by the toolkit internally and should
* not be called directly by programs.
*
* @see #registerKeyboardAction
*/
public void removeNotify() {
super.removeNotify();
// This isn't strictly correct. The event shouldn't be
// fired until *after* the parent is set to null. But
// we only get notified before that happens
firePropertyChange("ancestor", getParent(), null);
unregisterWithKeyboardManager();
deregisterNextFocusableComponent();
if (getCreatedDoubleBuffer()) {
RepaintManager.currentManager(this).resetDoubleBuffer();
setCreatedDoubleBuffer(false);
}
if (autoscrolls) {
Autoscroller.stop(this);
}
}
/**
* Adds the specified region to the dirty region list if the component
* is showing. The component will be repainted after all of the
* currently pending events have been dispatched.
*
* @param tm this parameter is not used
* @param x the x value of the dirty region
* @param y the y value of the dirty region
* @param width the width of the dirty region
* @param height the height of the dirty region
* @see #isPaintingOrigin()
* @see java.awt.Component#isShowing
* @see RepaintManager#addDirtyRegion
*/
public void repaint(long tm, int x, int y, int width, int height) {
RepaintManager.currentManager(this).addDirtyRegion(this, x, y, width, height);
}
/**
* Adds the specified region to the dirty region list if the component
* is showing. The component will be repainted after all of the
* currently pending events have been dispatched.
*
* @param r a Rectangle containing the dirty region
* @see #isPaintingOrigin()
* @see java.awt.Component#isShowing
* @see RepaintManager#addDirtyRegion
*/
public void repaint(Rectangle r) {
repaint(0,r.x,r.y,r.width,r.height);
}
/**
* Supports deferred automatic layout.
* invalidate and then adds this component's
* validateRoot to a list of components that need to be
* validated. Validation will occur after all currently pending
* events have been dispatched. In other words after this method
* is called, the first validateRoot (if any) found when walking
* up the containment hierarchy of this component will be validated.
* By default, JRootPane, JScrollPane,
* and JTextField return true
* from isValidateRoot.
* validate to get the contents of the
* GUI to update.
* revalidate calls by
* descendants of this component will cause the entire tree
* beginning with this root to be validated.
* Returns false by default. JScrollPane overrides
* this method and returns true.
*
* @return always returns false
* @see #revalidate
* @see java.awt.Component#invalidate
* @see java.awt.Container#validate
* @see java.awt.Container#isValidateRoot
*/
@Override
public boolean isValidateRoot() {
return false;
}
/**
* Returns true if this component tiles its children -- that is, if
* it can guarantee that the children will not overlap. The
* repainting system is substantially more efficient in this
* common case. JComponent subclasses that can't make this
* guarantee, such as JLayeredPane,
* should override this method to return false.
*
* @return always returns true
*/
public boolean isOptimizedDrawingEnabled() {
return true;
}
/**
* Returns {@code true} if a paint triggered on a child component should cause
* painting to originate from this Component, or one of its ancestors.
* Rectangle containing the region to be painted
*/
public void paintImmediately(Rectangle r) {
paintImmediately(r.x,r.y,r.width,r.height);
}
/**
* Returns whether this component should be guaranteed to be on top.
* For example, it would make no sense for Menus to pop up
* under another component, so they would always return true.
* Most components will want to return false, hence that is the default.
*
* @return always returns false
*/
// package private
boolean alwaysOnTop() {
return false;
}
void setPaintingChild(Component paintingChild) {
this.paintingChild = paintingChild;
}
void _paintImmediately(int x, int y, int w, int h) {
Graphics g;
Container c;
Rectangle b;
int tmpX, tmpY, tmpWidth, tmpHeight;
int offsetX=0,offsetY=0;
boolean hasBuffer = false;
JComponent bufferedComponent = null;
JComponent paintingComponent = this;
RepaintManager repaintManager = RepaintManager.currentManager(this);
// parent Container's up to Window or Applet. First container is
// the direct parent. Note that in testing it was faster to
// alloc a new Vector vs keeping a stack of them around, and gc
// seemed to have a minimal effect on this.
java.util.ListisOptimizedDrawingEnabled
* returns false.
*
* @return always returns true
*/
boolean checkIfChildObscuredBySibling() {
return true;
}
private void setFlag(int aFlag, boolean aValue) {
if(aValue) {
flags |= (1 << aFlag);
} else {
flags &= ~(1 << aFlag);
}
}
private boolean getFlag(int aFlag) {
int mask = (1 << aFlag);
return ((flags & mask) == mask);
}
// These functions must be static so that they can be called from
// subclasses inside the package, but whose inheritance hierarhcy includes
// classes outside of the package below JComponent (e.g., JTextArea).
static void setWriteObjCounter(JComponent comp, byte count) {
comp.flags = (comp.flags & ~(0xFF << WRITE_OBJ_COUNTER_FIRST)) |
(count << WRITE_OBJ_COUNTER_FIRST);
}
static byte getWriteObjCounter(JComponent comp) {
return (byte)((comp.flags >> WRITE_OBJ_COUNTER_FIRST) & 0xFF);
}
/** Buffering **/
/**
* Sets whether this component should use a buffer to paint.
* If set to true, all the drawing from this component will be done
* in an offscreen painting buffer. The offscreen painting buffer will
* the be copied onto the screen.
* If a Component is buffered and one of its ancestor
* is also buffered, the ancestor buffer will be used.
*
* @param aFlag if true, set this component to be double buffered
*/
public void setDoubleBuffered(boolean aFlag) {
setFlag(IS_DOUBLE_BUFFERED,aFlag);
}
/**
* Returns whether this component should use a buffer to paint.
*
* @return true if this component is double buffered, otherwise false
*/
public boolean isDoubleBuffered() {
return getFlag(IS_DOUBLE_BUFFERED);
}
/**
* Returns the JRootPane ancestor for this component.
*
* @return the JRootPane that contains this component,
* or null if no JRootPane is found
*/
public JRootPane getRootPane() {
return SwingUtilities.getRootPane(this);
}
/** Serialization **/
/**
* This is called from Component by way of reflection. Do NOT change
* the name unless you change the code in Component as well.
*/
void compWriteObjectNotify() {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, (byte)(count + 1));
if (count != 0) {
return;
}
uninstallUIAndProperties();
/* JTableHeader is in a separate package, which prevents it from
* being able to override this package-private method the way the
* other components can. We don't want to make this method protected
* because it would introduce public-api for a less-than-desirable
* serialization scheme, so we compromise with this 'instanceof' hack
* for now.
*/
if (getToolTipText() != null ||
this instanceof javax.swing.table.JTableHeader) {
ToolTipManager.sharedInstance().unregisterComponent(JComponent.this);
}
}
/**
* This object is the ObjectInputStream callback
* that's called after a complete graph of objects (including at least
* one JComponent) has been read.
* It sets the UI property of each Swing component
* that was read to the current default with updateUI.
* ReadObjectCallback per ObjectInputStream,
* they're stored in the static readObjectCallbacks
* hashtable.
*
* @see java.io.ObjectInputStream#registerValidation
* @see SwingUtilities#updateComponentTreeUI
*/
private class ReadObjectCallback implements ObjectInputValidation
{
private final VectorSwingUtilities.updateComponentTreeUI.
*/
public void validateObject() throws InvalidObjectException {
try {
for (JComponent root : roots) {
SwingUtilities.updateComponentTreeUI(root);
}
}
finally {
readObjectCallbacks.remove(inputStream);
}
}
/**
* If c isn't a descendant of a component we've already
* seen, then add it to the roots Vector.
*
* @param c the JComponent to add
*/
private void registerComponent(JComponent c)
{
/* If the Component c is a descendant of one of the
* existing roots (or it IS an existing root), we're done.
*/
for (JComponent root : roots) {
for(Component p = c; p != null; p = p.getParent()) {
if (p == root) {
return;
}
}
}
/* Otherwise: if Component c is an ancestor of any of the
* existing roots then remove them and add c (the "new root")
* to the roots vector.
*/
for(int i = 0; i < roots.size(); i++) {
JComponent root = roots.elementAt(i);
for(Component p = root.getParent(); p != null; p = p.getParent()) {
if (p == c) {
roots.removeElementAt(i--); // !!
break;
}
}
}
roots.addElement(c);
}
}
/**
* We use the ObjectInputStream "registerValidation"
* callback to update the UI for the entire tree of components
* after they've all been read in.
*
* @param s the ObjectInputStream from which to read
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException
{
s.defaultReadObject();
/* If there's no ReadObjectCallback for this stream yet, that is, if
* this is the first call to JComponent.readObject() for this
* graph of objects, then create a callback and stash it
* in the readObjectCallbacks table. Note that the ReadObjectCallback
* constructor takes care of calling s.registerValidation().
*/
ReadObjectCallback cb = readObjectCallbacks.get(s);
if (cb == null) {
try {
readObjectCallbacks.put(s, cb = new ReadObjectCallback(s));
}
catch (Exception e) {
throw new IOException(e.toString());
}
}
cb.registerComponent(this);
// Read back the client properties.
int cpCount = s.readInt();
if (cpCount > 0) {
clientProperties = new ArrayTable();
for (int counter = 0; counter < cpCount; counter++) {
clientProperties.put(s.readObject(),
s.readObject());
}
}
if (getToolTipText() != null) {
ToolTipManager.sharedInstance().registerComponent(this);
}
setWriteObjCounter(this, (byte)0);
}
/**
* Before writing a JComponent to an
* ObjectOutputStream we temporarily uninstall its UI.
* This is tricky to do because we want to uninstall
* the UI before any of the JComponent's children
* (or its LayoutManager etc.) are written,
* and we don't want to restore the UI until the most derived
* JComponent subclass has been been stored.
*
* @param s the ObjectOutputStream in which to write
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
ArrayTable.writeArrayTable(s, clientProperties);
}
/**
* Returns a string representation of this JComponent.
* This method
* is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be null.
*
* @return a string representation of this JComponent
*/
protected String paramString() {
String preferredSizeString = (isPreferredSizeSet() ?
getPreferredSize().toString() : "");
String minimumSizeString = (isMinimumSizeSet() ?
getMinimumSize().toString() : "");
String maximumSizeString = (isMaximumSizeSet() ?
getMaximumSize().toString() : "");
String borderString = (border == null ? ""
: (border == this ? "this" : border.toString()));
return super.paramString() +
",alignmentX=" + alignmentX +
",alignmentY=" + alignmentY +
",border=" + borderString +
",flags=" + flags + // should beef this up a bit
",maximumSize=" + maximumSizeString +
",minimumSize=" + minimumSizeString +
",preferredSize=" + preferredSizeString;
}
/**
* {@inheritDoc}
*/
@Override
@Deprecated
public void hide() {
boolean showing = isShowing();
super.hide();
if (showing) {
Container parent = getParent();
if (parent != null) {
Rectangle r = getBounds();
parent.repaint(r.x, r.y, r.width, r.height);
}
revalidate();
}
}
}