rt-thread-official/examples/gui/demo_view_animation.c

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

/*
 * ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC<EFBFBD>ϻ<EFBFBD>ͼ<EFBFBD><EFBFBD>ʵ<EFBFBD>ֶ<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><EFBFBD>
 *
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڶ<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>·<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҷ<EFBFBD>"
 */
static rt_int8_t dx = 1, dy = 1;
static rtgui_rect_t text_rect;
static rtgui_timer_t *timer;

void timeout(struct rtgui_timer* timer, void* parameter)
{
	struct rtgui_dc* dc;
	rtgui_rect_t rect;
	rtgui_widget_t *widget;

	/* <20>ؼ<EFBFBD>(view)ͨ<><CDA8>parameter<65><72><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݸ<EFBFBD><DDB8><EFBFBD>ʱ<EFBFBD><CAB1> */
	widget = (rtgui_widget_t*)parameter;

	/* <20><><EFBFBD>ÿؼ<C3BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC */
	dc = rtgui_dc_begin_drawing(widget);
	if (dc == RT_NULL) /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC<44><43><EFBFBD><EFBFBD><EFBFBD>أ<EFBFBD><D8A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD><D8BC>򸸿ؼ<F2B8B8BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC>DC<44>ǻ<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ɹ<EFBFBD><C9B9>ģ<EFBFBD> */
		return ;

	/* <20><><EFBFBD><EFBFBD>demo view<65><77><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD>жϱ߽<CFB1> */
	demo_view_get_rect(RTGUI_VIEW(widget), &rect);
	rect.y2 -= 5;

	/* <20>ж<EFBFBD><D0B6>Ƿ<EFBFBD><C7B7>ǵ<EFBFBD>һ<EFBFBD>λ<EFBFBD>ͼ */
	if ((text_rect.x1 == 0) && (text_rect.y1 == 0))
	{
		rtgui_rect_moveto(&text_rect, rect.x1, rect.y1);
	}
	else
	{
	    /* <20><><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5><EFBFBD><EFBFBD><EFBFBD> */
	    rtgui_dc_fill_rect(dc, &text_rect);
	}

    /* <20><><EFBFBD><EFBFBD>dx<64><78>dy */
	if (text_rect.x2 >= rect.x2) dx = -1;
	if (text_rect.x1 < rect.x1)  dx = 1;
	if (text_rect.y2 >= rect.y2) dy = -1;
	if (text_rect.y1 < rect.y1) dy = 1;

    /* <20>ƶ<EFBFBD><C6B6>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB> */
	text_rect.x1 += dx; text_rect.x2 += dx;
	text_rect.y1 += dy; text_rect.y2 += dy;

    /* <20><>ͼ */
	rtgui_dc_draw_text(dc, "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҷ<EFBFBD>", &text_rect);

	/* <20><>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD> */
	rtgui_dc_end_drawing(dc);
}

rt_bool_t animation_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
{
	if (event->type == RTGUI_EVENT_PAINT)
	{
		struct rtgui_dc* dc;
		rtgui_rect_t rect;

		/* <20><>Ϊ<EFBFBD>õ<EFBFBD><C3B5><EFBFBD>demo view<65><77><EFBFBD><EFBFBD><EFBFBD>汾<EFBFBD><E6B1BE><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֿؼ<D6BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD>ͼʱ<CDBC><CAB1>Ҫ<EFBFBD><D2AA>demo view<65>Ȼ<EFBFBD>ͼ */
		rtgui_view_event_handler(widget, event);

		/* <20><><EFBFBD>ÿؼ<C3BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC */
		dc = rtgui_dc_begin_drawing(widget);
		if (dc == RT_NULL) /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DC<44><43><EFBFBD><EFBFBD><EFBFBD>أ<EFBFBD><D8A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD><D8BC>򸸿ؼ<F2B8B8BF><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<D7B4><CCAC>DC<44>ǻ<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ɹ<EFBFBD><C9B9>ģ<EFBFBD> */
			return RT_FALSE;

        /* <20><><EFBFBD><EFBFBD>demo view<65><77><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
        demo_view_get_rect(RTGUI_VIEW(widget), &rect);

	    /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
	    rtgui_dc_fill_rect(dc, &rect);

        /* <20><>ͼ */
        rtgui_dc_draw_text(dc, "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҷ<EFBFBD>", &text_rect);

		/* <20><>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD> */
		rtgui_dc_end_drawing(dc);
	}
	else
	{
		/* <20><><EFBFBD><EFBFBD>Ĭ<EFBFBD>ϵ<EFBFBD><CFB5>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
		return rtgui_view_event_handler(widget, event);
	}

	return RT_FALSE;
}

rtgui_view_t *demo_view_animation(rtgui_workbench_t* workbench)
{
	rtgui_view_t *view;

	view = demo_view(workbench, "DC <20><><EFBFBD><EFBFBD>");
	if (view != RT_NULL)
		rtgui_widget_set_event_handler(RTGUI_WIDGET(view), animation_event_handler);

	rtgui_font_get_metrics(RTGUI_WIDGET_FONT(RTGUI_WIDGET(view)), "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҷ<EFBFBD>", &text_rect);

	/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
	timer = rtgui_timer_create(2, RT_TIMER_FLAG_PERIODIC, timeout, (void*)view);
	rtgui_timer_start(timer);

	return view;
}