mirror of
https://github.com/RT-Thread/rt-thread.git
synced 2026-09-28 16:14:20 +08:00
bernard.xiong@gmail.com
7774d03fd7
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@967 bbd45198-f89e-11dd-88c7-29a3b14d5316
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* 程序清单：TTF字体显示演示
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*
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* 这个例子会在创建出的view上进行TTF字体显示的演示
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*/
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#include "demo_view.h"
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#include <rtgui/dc.h>
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#include <rtgui/font.h>
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#include <rtgui/rtgui_system.h>
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#ifdef RTGUI_USING_TTF
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static rtgui_font_t *font_16, *font_24, *font_36, *font_48;
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/*
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* view的事件处理函数
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*/
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rt_bool_t ttf_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
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{
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/* 仅对PAINT事件进行处理 */
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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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rtgui_font_t* saved;
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/*
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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
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* 先绘图
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*/
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rtgui_view_event_handler(widget, event);
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/************************************************************************/
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/* 下面的是DC的操作 */
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/************************************************************************/
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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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/* 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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if (dc == RT_NULL)
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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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saved = RTGUI_WIDGET_FONT(widget);
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RTGUI_WIDGET_FONT(widget) = font_16;
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rtgui_dc_draw_text(dc, "ABCD中文", &rect);
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rect.y1 += 18;
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RTGUI_WIDGET_FONT(widget) = font_24;
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rtgui_dc_draw_text(dc, "ABCD中文", &rect);
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rect.y1 += 26;
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RTGUI_WIDGET_FONT(widget) = font_36;
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rtgui_dc_draw_text(dc, "ABCD中文", &rect);
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rect.y1 += 38;
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RTGUI_WIDGET_FONT(widget) = font_48;
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rtgui_dc_draw_text(dc, "ABCD中文", &rect);
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RTGUI_WIDGET_FONT(widget) = saved;
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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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/* 其他事件，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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/* 创建用于TTF字体显示演示用的视图 */
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rtgui_view_t *demo_view_ttf(rtgui_workbench_t* workbench)
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{
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rtgui_view_t *view;
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font_16 = rtgui_freetype_font_create("d:/simsun.ttf", 0, 0, 16);
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font_24 = rtgui_freetype_font_create("d:/simsun.ttf", 0, 0, 24);
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font_36 = rtgui_freetype_font_create("d:/simsun.ttf", 0, 0, 36);
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font_48 = rtgui_freetype_font_create("d:/simsun.TTF", 0, 0, 72);
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view = demo_view(workbench, "TTF 演示");
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if (view != RT_NULL)
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{
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RTGUI_WIDGET_BACKGROUND(RTGUI_WIDGET(view)) = white;
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/* 设置成自己的事件处理函数 */
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rtgui_widget_set_event_handler(RTGUI_WIDGET(view), ttf_event_handler);
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}
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return view;
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}
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#endif
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