85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
/*
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* 程序清单：DC Buffer演示
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*
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* 这个例子会在创建出的view上进行DC Buffer的演示
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*/
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#include "demo_view.h"
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#include <rtgui/rtgui_system.h>
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#include <rtgui/widgets/label.h>
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#include <rtgui/widgets/slider.h>
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#include <rtgui/image.h>
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static rtgui_image_t *background;
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static struct rtgui_dc *dc_buffer;
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/*
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* view的事件处理函数
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*/
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static rt_bool_t dc_buffer_event_handler(struct rtgui_object* object, rtgui_event_t *event)
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{
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struct rtgui_widget *widget = RTGUI_WIDGET(object);
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/* 仅对PAINT事件进行处理 */
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if (event->type == RTGUI_EVENT_PAINT)
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{
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struct rtgui_dc* dc;
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rtgui_rect_t rect;
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/*
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* 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
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* 先绘图
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*/
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rtgui_container_event_handler(object, event);
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/* 获得控件所属的DC */
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dc = rtgui_dc_begin_drawing(widget);
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/* 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） */
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if (dc == RT_NULL)
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return RT_FALSE;
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/* 获得demo view允许绘图的区域 */
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demo_view_get_logic_rect(RTGUI_CONTAINER(widget), &rect);
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rect.x1 += 10;
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rect.y1 += 10;
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rtgui_dc_blit(dc_buffer, NULL, dc, &rect);
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/* 绘图完成 */
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rtgui_dc_end_drawing(dc);
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}
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else
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{
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/* 其他事件，调用默认的事件处理函数 */
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return rtgui_container_event_handler(object, event);
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}
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return RT_FALSE;
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}
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/* 创建用于DC Buffer操作演示用的视图 */
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rtgui_container_t *demo_view_dc_buffer()
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{
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rtgui_container_t *view;
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if (dc_buffer == RT_NULL)
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{
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rtgui_rect_t rect = {0, 0, 50, 50};
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/* 创建 DC Buffer，长 50，宽 50 */
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dc_buffer = rtgui_dc_buffer_create(50, 50);
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RTGUI_DC_FC(dc_buffer) = blue;
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rtgui_dc_fill_rect(dc_buffer, &rect);
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RTGUI_DC_FC(dc_buffer) = red;
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rtgui_dc_draw_circle(dc_buffer, 25, 25, 10);
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}
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view = demo_view("缓冲DC演示");
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if (view != RT_NULL)
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/* 设置成自己的事件处理函数 */
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rtgui_object_set_event_handler(RTGUI_OBJECT(view), dc_buffer_event_handler);
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return view;
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}
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