add buffer animation demo.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@691 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/gui/SConscript

@@ -7,6 +7,7 @@ demo_listview.c
 demo_panel_single.c
 demo_view.c
 demo_view_animation.c
+demo_view_buffer_animation.c
 demo_view_box.c
 demo_view_button.c
 demo_view_checkbox.c

examples/gui/demo_view_buffer_animation.c

+#include <rtgui/dc.h>
+#include <rtgui/rtgui_system.h>
+#include <rtgui/widgets/view.h>
+#include "demo_view.h"
+
+/*
+ * 直接在DC上绘图以实现动画效果
+ *
+ * 动画是依赖于定时器驱动的，会上下翻滚显示文字
+ * "飞线乱飞"
+ */
+static rt_int8_t dx = 1, dy = 1;
+static rtgui_rect_t text_rect;
+static rtgui_timer_t *timer;
+static struct rtgui_dc *dc_buffer;
+static void timeout(struct rtgui_timer* timer, void* parameter)
+{
+	struct rtgui_dc* dc;
+	rtgui_rect_t rect;
+	rtgui_widget_t *widget;
+
+	/* 控件(view)通过parameter参数传递给定时器 */
+	widget = (rtgui_widget_t*)parameter;
+
+	/* 获得控件所属的DC */
+	dc = rtgui_dc_begin_drawing(widget);
+	if (dc == RT_NULL) /* 如果不能正常获得DC，返回（如果控件或父控件是隐藏状态，DC是获取不成功的） */
+		return ;
+
+	/* 获得demo view允许绘图的区域，主要用于判断边界 */
+	demo_view_get_rect(RTGUI_VIEW(widget), &rect);
+	rect.y2 -= 5;
+
+	/* 判断是否是第一次绘图 */
+	if ((text_rect.x1 == 0) && (text_rect.y1 == 0))
+	{
+		rtgui_rect_moveto(&text_rect, rect.x1, rect.y1);
+	}
+
+    /* 设置dx和dy */
+	if (text_rect.x2 >= rect.x2) dx = -1;
+	if (text_rect.x1 < rect.x1)  dx = 1;
+	if (text_rect.y2 >= rect.y2) dy = -1;
+	if (text_rect.y1 < rect.y1) dy = 1;
+
+    /* 移动文本框的位置 */
+	text_rect.x1 += dx; text_rect.x2 += dx;
+	text_rect.y1 += dy; text_rect.y2 += dy;
+
+    /* 绘图 */
+	rect = text_rect;
+	rect.x2 += 2; rect.y2 += 2;
+	rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
+
+	/* 绘图完成 */
+	rtgui_dc_end_drawing(dc);
+}
+
+static rt_bool_t animation_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
+{
+	if (event->type == RTGUI_EVENT_PAINT)
+	{
+		struct rtgui_dc* dc;
+		rtgui_rect_t rect;
+
+		/* 因为用的是demo view，上面本身有一部分控件，所以在绘图时先要让demo view先绘图 */
+		rtgui_view_event_handler(widget, event);
+
+		/* 获得控件所属的DC */
+		dc = rtgui_dc_begin_drawing(widget);
+		if (dc == RT_NULL) /* 如果不能正常获得DC，返回（如果控件或父控件是隐藏状态，DC是获取不成功的） */
+			return RT_FALSE;
+
+        /* 获得demo view允许绘图的区域 */
+        demo_view_get_rect(RTGUI_VIEW(widget), &rect);
+
+		/* 绘图 */
+		rect = text_rect;
+		rtgui_rect_inflate(&rect, +1);
+		rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
+
+		/* 绘图完成 */
+		rtgui_dc_end_drawing(dc);
+	}
+	else
+	{
+		/* 调用默认的事件处理函数 */
+		return rtgui_view_event_handler(widget, event);
+	}
+
+	return RT_FALSE;
+}
+
+rtgui_view_t *demo_view_buffer_animation(rtgui_workbench_t* workbench)
+{
+	rtgui_view_t *view;
+
+	view = demo_view(workbench, "DC 动画");
+	if (view != RT_NULL)
+		rtgui_widget_set_event_handler(RTGUI_WIDGET(view), animation_event_handler);
+
+	rtgui_font_get_metrics(RTGUI_WIDGET_FONT(RTGUI_WIDGET(view)), "飞线乱飞", &text_rect);
+	if (dc_buffer == RT_NULL)
+	{
+		rtgui_rect_t rect;
+
+		rect.x1 = 0; rect.x2 = rtgui_rect_width(text_rect) + 2;
+		rect.y1 = 0; rect.y2 = rtgui_rect_height(text_rect) + 2;
+
+		/* 创建 DC Buffer，长 50，宽 50 */
+		dc_buffer = rtgui_dc_buffer_create(rtgui_rect_width(rect), rtgui_rect_height(rect));
+		RTGUI_DC_FC(dc_buffer) = RTGUI_WIDGET_BACKGROUND(RTGUI_WIDGET(view));
+		rtgui_dc_fill_rect(dc_buffer, &rect);
+		RTGUI_DC_FC(dc_buffer) = black;
+		rect.x1 = 1; rect.y1 = 1;
+		rtgui_dc_draw_text(dc_buffer, "飞线乱飞", &rect);
+	}
+
+	/* 启动定时器以触发动画 */
+	timer = rtgui_timer_create(2, RT_TIMER_FLAG_PERIODIC, timeout, (void*)view);
+	rtgui_timer_start(timer);
+
+	return view;
+}

examples/gui/demo_workbench.c

@@ -54,6 +54,7 @@ static void workbench_entry(void* parameter)
 	demo_view_dc(workbench);
 	demo_view_dc_buffer(workbench);
 	demo_view_animation(workbench);
+	demo_view_buffer_animation(workbench);
 	demo_view_window(workbench);
 	demo_view_label(workbench);
 	demo_view_button(workbench);