114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
#include <rtgui/dc.h>
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#include <rtgui/rtgui_system.h>
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#include <rtgui/widgets/view.h>
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#include "demo_view.h"
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/*
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* 直接在DC上绘图以实现动画效果
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*
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* 动画是依赖于定时器驱动的，会上下翻滚显示文字
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* "飞线乱飞"
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*/
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static rt_int8_t dx = 1, dy = 1;
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static rtgui_rect_t text_rect;
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static rtgui_timer_t *timer;
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void timeout(struct rtgui_timer* timer, void* parameter)
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{
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struct rtgui_dc* dc;
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rtgui_rect_t rect;
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rtgui_widget_t *widget;
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/* 控件(view)通过parameter参数传递给定时器 */
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widget = (rtgui_widget_t*)parameter;
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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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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） */
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return ;
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/* 获得demo view允许绘图的区域，主要用于判断边界 */
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demo_view_get_rect(RTGUI_VIEW(widget), &rect);
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rect.y2 -= 5;
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/* 判断是否是第一次绘图 */
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if ((text_rect.x1 == 0) && (text_rect.y1 == 0))
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{
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rtgui_rect_moveto(&text_rect, rect.x1, rect.y1);
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}
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else
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{
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/* 擦除老的文字 */
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rtgui_dc_fill_rect(dc, &text_rect);
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}
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/* 设置dx和dy */
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if (text_rect.x2 >= rect.x2) dx = -1;
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if (text_rect.x1 < rect.x1) dx = 1;
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if (text_rect.y2 >= rect.y2) dy = -1;
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if (text_rect.y1 < rect.y1) dy = 1;
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/* 移动文本框的位置 */
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text_rect.x1 += dx; text_rect.x2 += dx;
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text_rect.y1 += dy; text_rect.y2 += dy;
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/* 绘图 */
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rtgui_dc_draw_text(dc, "飞线乱飞", &text_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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rt_bool_t animation_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
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{
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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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/* 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 */
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rtgui_view_event_handler(widget, 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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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） */
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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_rect(RTGUI_VIEW(widget), &rect);
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/* 擦除所有 */
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rtgui_dc_fill_rect(dc, &rect);
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/* 绘图 */
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rtgui_dc_draw_text(dc, "飞线乱飞", &text_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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/* 调用默认的事件处理函数 */
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return rtgui_view_event_handler(widget, event);
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}
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return RT_FALSE;
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}
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rtgui_view_t *demo_view_animation(rtgui_workbench_t* workbench)
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{
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rtgui_view_t *view;
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view = demo_view(workbench, "DC 动画");
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if (view != RT_NULL)
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rtgui_widget_set_event_handler(RTGUI_WIDGET(view), animation_event_handler);
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rtgui_font_get_metrics(RTGUI_WIDGET_FONT(RTGUI_WIDGET(view)), "飞线乱飞", &text_rect);
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/* 启动定时器以触发动画 */
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timer = rtgui_timer_create(2, RT_TIMER_FLAG_PERIODIC, timeout, (void*)view);
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rtgui_timer_start(timer);
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return view;
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}
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