123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*
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* 程序清单：DC上显示图像演示
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*
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* 这个例子会在创建出的view上显示图像
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*/
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#include "demo_view.h"
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#include <rtgui/widgets/button.h>
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#include <rtgui/widgets/filelist_view.h>
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#include <string.h>
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static rtgui_image_t* image = RT_NULL;
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static rtgui_view_t* _view = RT_NULL;
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/* 打开按钮的回调函数 */
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static void open_btn_onbutton(rtgui_widget_t* widget, struct rtgui_event* event)
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{
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rtgui_filelist_view_t *view;
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rtgui_workbench_t *workbench;
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rtgui_rect_t rect;
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/* 获得顶层的workbench */
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workbench = RTGUI_WORKBENCH(rtgui_widget_get_toplevel(widget));
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rtgui_widget_get_rect(RTGUI_WIDGET(workbench), &rect);
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/* WIN32平台上和真实设备上的初始路径处理 */
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#ifdef _WIN32
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view = rtgui_filelist_view_create(workbench, "d:\\", "*.*", &rect);
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#else
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view = rtgui_filelist_view_create(workbench, "/", "*.*", &rect);
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#endif
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/* 模态显示一个文件列表视图，以提供给用户选择图像文件 */
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if (rtgui_view_show(RTGUI_VIEW(view), RT_TRUE) == RTGUI_MODAL_OK)
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{
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char path[32], image_type[8];
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/* 设置文件路径的标签 */
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rtgui_filelist_view_get_fullpath(view, path, sizeof(path));
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if (image != RT_NULL) rtgui_image_destroy(image);
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rt_memset(image_type, 0, sizeof(image_type));
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/* 获得图像的类型 */
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if (rt_strstr(path, ".png") != RT_NULL ||
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rt_strstr(path, ".PNG") != RT_NULL)
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strcat(image_type, "png");
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if (rt_strstr(path, ".jpg") != RT_NULL ||
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rt_strstr(path, ".JPG") != RT_NULL)
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strcat(image_type, "jpeg");
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if (rt_strstr(path, ".hdc") != RT_NULL ||
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rt_strstr(path, ".HDC") != RT_NULL)
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strcat(image_type, "hdc");
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/* 如果图像文件有效，创建相应的rtgui_image对象 */
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if (image_type[0] != '\0')
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image = rtgui_image_create_from_file(image_type, path, RT_TRUE);
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}
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/* 删除 文件列表 视图 */
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rtgui_view_destroy(RTGUI_VIEW(view));
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rtgui_view_show(_view, RT_FALSE);
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}
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/* 演示视图的事件处理函数 */
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static rt_bool_t demo_view_event_handler(rtgui_widget_t* widget, rtgui_event_t *event)
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{
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rt_bool_t result;
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/* 先调用默认的事件处理函数(这里只关心PAINT事件，但演示视图还有本身的一些控件) */
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result = rtgui_view_event_handler(widget, event);
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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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/* 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)
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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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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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/* 获得图像显示区域 */
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rect.x1 += 5; rect.x2 -= 5;
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rect.y1 += 30;
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if (image != RT_NULL)
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rtgui_image_blit(image, 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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return result;
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}
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/* 创建用于显示图像的演示视图 */
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rtgui_view_t* demo_view_image(rtgui_workbench_t* workbench)
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{
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rtgui_rect_t rect;
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rtgui_button_t* open_btn;
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/* 先创建一个演示视图 */
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_view = demo_view(workbench, "图像演示");
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if (_view != RT_NULL)
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/* 设置默认的事件处理函数到demo_view_event_handler函数 */
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rtgui_widget_set_event_handler(RTGUI_WIDGET(_view), demo_view_event_handler);
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/* 添加一个按钮 */
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demo_view_get_rect(_view, &rect);
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rect.x1 += 5; rect.x2 = rect.x1 + 120;
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rect.y2 = rect.y1 + 20;
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open_btn = rtgui_button_create("打开图像文件");
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rtgui_container_add_child(RTGUI_CONTAINER(_view), RTGUI_WIDGET(open_btn));
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rtgui_widget_set_rect(RTGUI_WIDGET(open_btn), &rect);
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rtgui_button_set_onbutton(open_btn, open_btn_onbutton);
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return _view;
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}
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