add return action in listview demo.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@364 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/gui/demo_listview.c

@@ -5,6 +5,8 @@
 #include <rtgui/widgets/list_view.h>
 
 static rtgui_workbench_t* workbench = RT_NULL;
+static rtgui_view_t* _view = RT_NULL;
+static rtgui_image_t* return_image = RT_NULL;
 
 static void listitem_action(void* parameter)
 {
@@ -33,35 +35,44 @@ static void listitem_action(void* parameter)
 	rtgui_win_show(win, RT_FALSE);
 }
 
-static struct rtgui_list_item items[] = 
+static void return_action(void* parameter)
+{
+	if (_view != RT_NULL)
+	{
+		rtgui_view_destroy(_view);
+		_view = RT_NULL;
+	}
+}
+
+static const struct rtgui_list_item items[] = 
 {
 	{"б1", RT_NULL, listitem_action, (void*)1},
 	{"б2", RT_NULL, listitem_action, (void*)2},
 	{"б3", RT_NULL, listitem_action, (void*)3},
 	{"б4", RT_NULL, listitem_action, (void*)4},
 	{"б5", RT_NULL, listitem_action, (void*)5},
+	{"", RT_NULL, return_action, RT_NULL},
 };
 
 static void open_btn_onbutton(rtgui_widget_t* widget, struct rtgui_event* event)
 {
 	/* create a file list view */
 	rtgui_rect_t rect;
-	rtgui_list_view_t *view;
 
 	workbench = RTGUI_WORKBENCH(rtgui_widget_get_toplevel(widget));
 	rtgui_widget_get_rect(RTGUI_WIDGET(workbench), &rect);
 
-	view = rtgui_list_view_create(items, sizeof(items)/sizeof(struct rtgui_list_item), &rect);
-	rtgui_workbench_add_view(workbench, RTGUI_VIEW(view));
+	_view = rtgui_list_view_create(items, sizeof(items)/sizeof(struct rtgui_list_item), &rect);
+	rtgui_workbench_add_view(workbench, RTGUI_VIEW(_view));
 
 	/* ģʽʾͼ */
-	rtgui_view_show(RTGUI_VIEW(view), RT_FALSE);
+	rtgui_view_show(RTGUI_VIEW(_view), RT_FALSE);
 }
 
 rtgui_view_t* demo_listview_view(rtgui_workbench_t* workbench)
 {
 	rtgui_rect_t rect;
-	rtgui_view_t* view;
+	rtgui_list_view_t *view;
 	rtgui_button_t* open_btn;
 
 	view = demo_view(workbench, "бͼʾ");