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- /*
- * 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;
- /*
- * 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_logic_rect(RTGUI_VIEW(widget), &rect);
- rect.x1 += 10;
- rect.y1 += 10;
- rtgui_dc_blit(dc_buffer, NULL, 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)
- {
- rtgui_rect_t rect = {0, 0, 50, 50};
- /* 创建 DC Buffer,长 50,宽 50 */
- dc_buffer = rtgui_dc_buffer_create(50, 50);
- RTGUI_DC_FC(dc_buffer) = blue;
- rtgui_dc_fill_rect(dc_buffer, &rect);
- RTGUI_DC_FC(dc_buffer) = red;
- 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;
- }
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