81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/*
|
||
* 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 <rtgui/event.h>
|
||
#include <rtgui/widgets/view.h>
|
||
#include <rtgui/rtgui_system.h>
|
||
#include <rtgui/widgets/label.h>
|
||
#include <rtgui/widgets/slider.h>
|
||
#include <rtgui/image.h>
|
||
#include "demo_view.h"
|
||
|
||
static struct rtgui_dc *dc_buffer;
|
||
|
||
/*
|
||
* view的事件处理函数
|
||
*/
|
||
static rt_bool_t dc_buffer_event_handler(PVOID wdt, 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(wdt, event);
|
||
|
||
/* 获得控件所属的DC */
|
||
dc = rtgui_dc_begin_drawing(wdt);
|
||
/* 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;
|
||
rtgui_widget_get_rect(wdt, &rect);
|
||
rect.x1 += 10;
|
||
rect.y1 += 40;
|
||
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(wdt, event);
|
||
}
|
||
|
||
return RT_FALSE;
|
||
}
|
||
|
||
/* 创建用于DC Buffer操作演示用的视图 */
|
||
rtgui_view_t *demo_gui_dc_buffer(rtgui_view_t* parent_view)
|
||
{
|
||
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_create(parent_view, "缓冲DC演示");
|
||
if (view == RT_NULL) return RT_NULL;
|
||
/* 设置成自己的事件处理函数 */
|
||
rtgui_widget_set_event_handler(view, dc_buffer_event_handler);
|
||
|
||
return view;
|
||
}
|