151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
#include <rtgui/dc.h>
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#include <rtgui/rtgui_system.h>
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#include <rtgui/widgets/container.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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static struct rtgui_dc *dc_buffer;
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static 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_logic_rect(RTGUI_CONTAINER(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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/* 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;
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text_rect.x2 += dx;
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text_rect.y1 += dy;
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text_rect.y2 += dy;
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/* 绘图 */
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rect = text_rect;
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rect.x2 += 2;
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rect.y2 += 2;
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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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static rt_bool_t animation_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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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_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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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_logic_rect(RTGUI_CONTAINER(widget), &rect);
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/* 绘图 */
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rect = text_rect;
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rtgui_rect_inflate(&rect, +1);
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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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/* 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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static rt_bool_t animation_on_show(struct rtgui_object *object, struct rtgui_event *event)
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{
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rt_kprintf("buffer animation on show\n");
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rtgui_timer_start(timer);
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return RT_TRUE;
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}
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static rt_bool_t animation_on_hide(struct rtgui_object *object, struct rtgui_event *event)
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{
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rt_kprintf("buffer animation on hide\n");
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rtgui_timer_stop(timer);
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return RT_TRUE;
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}
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struct rtgui_container *demo_view_buffer_animation(void)
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{
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struct rtgui_container *container;
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container = demo_view("DC 缓冲区动画");
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if (container != RT_NULL)
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rtgui_object_set_event_handler(RTGUI_OBJECT(container), animation_event_handler);
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rtgui_font_get_metrics(RTGUI_WIDGET_FONT(container), "缓冲动画", &text_rect);
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if (dc_buffer == RT_NULL)
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{
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rtgui_rect_t rect;
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rect.x1 = 0;
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rect.x2 = rtgui_rect_width(text_rect) + 2;
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rect.y1 = 0;
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rect.y2 = rtgui_rect_height(text_rect) + 2;
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/* 创建 DC Buffer，长 50，宽 50 */
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dc_buffer = rtgui_dc_buffer_create(rtgui_rect_width(rect), rtgui_rect_height(rect));
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RTGUI_DC_FC(dc_buffer) = RTGUI_WIDGET_BACKGROUND(container);
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rtgui_dc_fill_rect(dc_buffer, &rect);
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RTGUI_DC_FC(dc_buffer) = black;
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rect.x1 = 1;
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rect.y1 = 1;
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rtgui_dc_draw_text(dc_buffer, "缓冲动画", &rect);
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}
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/* 启动定时器以触发动画 */
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timer = rtgui_timer_create(1, RT_TIMER_FLAG_PERIODIC, timeout, (void *)container);
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rtgui_widget_set_onshow(RTGUI_WIDGET(container), animation_on_show);
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rtgui_widget_set_onhide(RTGUI_WIDGET(container), animation_on_hide);
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return container;
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}
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