rt-thread/examples/gui/demo_view_benchmark.c

#include <rtgui/dc.h>
#include <rtgui/dc_hw.h>
#include <rtgui/rtgui_system.h>
#include <rtgui/widgets/view.h>
#include "demo_view.h"

#define RAND(x1, x2) ((rand() % (x2 - x1)) + x1)

static rtgui_view_t* view = RT_NULL;
static int running = 0;

void _onidle(rtgui_widget_t* widget, rtgui_event_t *event)
{
	rtgui_color_t color;
	rtgui_rect_t rect, draw_rect;
	struct rtgui_dc *dc;

	/* 获得控件所属的DC */
	// dc = rtgui_dc_hw_create(RTGUI_WIDGET(view)); 
	dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(view));
	if (dc == RT_NULL) return ;

	demo_view_get_rect(RTGUI_VIEW(view), &rect);
	draw_rect.x1 = RAND(rect.x1, rect.x2);
	draw_rect.y1 = RAND(rect.y1, rect.y2);
	draw_rect.x2 = RAND(draw_rect.x1, rect.x2);
	draw_rect.y2 = RAND(draw_rect.y1, rect.y2);

	color = RTGUI_RGB(rand() % 255, rand() % 255, rand() % 255);
	RTGUI_WIDGET_BACKGROUND(RTGUI_WIDGET(view)) = color;

	rtgui_dc_fill_rect(dc, &draw_rect);

	/* 绘图完成 */
	rtgui_dc_end_drawing(dc);
}

void _draw_default(rtgui_widget_t* widget, rtgui_event_t* event)
{
	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 ;

	/* 获得demo view允许绘图的区域 */
	demo_view_get_rect(RTGUI_VIEW(widget), &rect);

	/* 擦除所有 */
	RTGUI_WIDGET_BACKGROUND(widget) = default_background;
	rtgui_dc_fill_rect(dc, &rect);

	/* 显示提示 */
	rtgui_dc_draw_text(dc, "按任意键开始/停止测试...", &rect);

	/* 绘图完成 */
	rtgui_dc_end_drawing(dc);
}

rt_bool_t benchmark_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
{
	if (event->type == RTGUI_EVENT_PAINT)
	{
		_draw_default(widget, event);
	}
	else if (event->type == RTGUI_EVENT_KBD)
	{
		struct rtgui_event_kbd *kbd = (struct rtgui_event_kbd*)event;

		if (RTGUI_KBD_IS_UP(kbd))
		{
			if (running)
			{
				/* stop */
				rtgui_thread_set_onidle(RT_NULL);
				_draw_default(widget, event);
			}
			else
			{
				/* run */
				rtgui_thread_set_onidle(_onidle);
			}

			running = !running;
		}
		return RT_TRUE;
	}
	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_benchmark(rtgui_workbench_t* workbench)
{
	srand(100);
	view = demo_view(workbench, "绘图测试");
	rtgui_widget_set_event_handler(RTGUI_WIDGET(view), benchmark_event_handler);

	return view;
}