fix dual panel issue.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@580 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/gui/demo_panel.c

@@ -20,7 +20,7 @@ void panel_init(void)
     /* register main panel */
     rect.x1 = 0;
     rect.y1 = 25;
-    rect.x2 = 320;
+    rect.x2 = 240;
     rect.y2 = 320;
     rtgui_panel_register("main", &rect);
     rtgui_panel_set_default_focused("main");

examples/gui/demo_view_dc_buffer.c

@@ -0,0 +1,77 @@
+/*
+ * 程序清单：DC Buffer演示
+ *
+ * 这个例子会在创建出的view上进行DC Buffer的演示
+ */
+
+#include "demo_view.h"
+#include <rtgui/rtgui_system.h>
+#include <rtgui/widgets/label.h>
+#include <rtgui/widgets/slider.h>
+#include <rtgui/image.h>
+
+static rtgui_image_t *background;
+static struct rtgui_dc *dc_buffer;
+
+/*
+ * view的事件处理函数
+ */
+static rt_bool_t dc_buffer_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
+{
+
+	/* 仅对PAINT事件进行处理 */
+	if (event->type == RTGUI_EVENT_PAINT)
+	{
+		struct rtgui_dc* dc;
+		rtgui_rect_t rect;
+		rtgui_point_t point = {0, 0};
+
+		/*
+		 * 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);
+		/* 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） */
+		if (dc == RT_NULL)
+			return RT_FALSE;
+
+		/* 获得demo view允许绘图的区域 */
+		demo_view_get_rect(RTGUI_VIEW(widget), &rect);
+
+		rtgui_dc_blit(dc_buffer, &point, dc, &rect);
+
+		/* 绘图完成 */
+		rtgui_dc_end_drawing(dc);
+	}
+	else
+	{
+		/* 其他事件，调用默认的事件处理函数 */
+		return rtgui_view_event_handler(widget, event);
+	}
+
+	return RT_FALSE;
+}
+
+/* 创建用于DC Buffer操作演示用的视图 */
+rtgui_view_t *demo_view_dc_buffer(rtgui_workbench_t* workbench)
+{
+	rtgui_view_t *view;
+
+	if (dc_buffer == RT_NULL)
+	{
+		/* 创建 DC Buffer，长 50，宽 50 */
+		dc_buffer = rtgui_dc_buffer_create(50, 50);
+		rtgui_dc_set_color(dc_buffer, blue);
+		rtgui_dc_draw_circle(dc_buffer, 25, 25, 10);
+	}
+
+	view = demo_view(workbench, "缓冲DC演示");
+	if (view != RT_NULL)
+		/* 设置成自己的事件处理函数 */
+		rtgui_widget_set_event_handler(RTGUI_WIDGET(view), dc_buffer_event_handler);
+
+	return view;
+}

examples/gui/demo_workbench.c

@@ -53,6 +53,7 @@ static void workbench_entry(void* parameter)
 
 	/* 初始化各个例子的视图 */
 	demo_view_dc(workbench);
+	demo_view_dc_buffer(workbench);
 	demo_view_animation(workbench);
 	demo_view_window(workbench);
 	demo_view_label(workbench);