148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
#include <rtgui/dc.h>
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#include "mywidget.h"
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/* 控件绘图函数 */
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static void rtgui_mywidget_ondraw(struct rtgui_mywidget* me)
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{
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struct rtgui_dc* dc;
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struct rtgui_rect rect;
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rt_uint16_t x, y;
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/* 获得目标DC，开始绘图 */
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dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(me));
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if (dc == RT_NULL) return;
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/* 获得窗口的尺寸 */
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rtgui_widget_get_rect(RTGUI_WIDGET(me), &rect);
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/* 绘制背景色 */
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RTGUI_DC_BC(dc) = white;
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rtgui_dc_fill_rect(dc, &rect);
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/* 计算中心原点 */
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x = (rect.x2 + rect.x1)/2;
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y = (rect.y2 + rect.y1)/2;
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/* 绘制十字架 */
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RTGUI_DC_BC(dc) = black;
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rtgui_dc_draw_hline(dc, rect.x1, rect.x2, y);
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rtgui_dc_draw_vline(dc, x, rect.y1, rect.y2);
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/* 根据状态绘制圆圈 */
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if (me->status == MYWIDGET_STATUS_ON)
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RTGUI_DC_BC(dc) = green;
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else
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RTGUI_DC_BC(dc) = red;
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rtgui_dc_fill_circle(dc, x, y, 5);
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/* 结束绘图 */
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rtgui_dc_end_drawing(dc);
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return;
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}
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/* 鼠标事件处理函数 */
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static void rtgui_mywidget_onmouse(struct rtgui_mywidget* me, struct rtgui_event_mouse* mouse)
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{
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struct rtgui_rect rect;
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rt_uint16_t x, y;
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/* 仅对鼠标抬起动作进行处理 */
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if (!(mouse->button & RTGUI_MOUSE_BUTTON_UP)) return;
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/* 获得控件的位置 */
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rtgui_widget_get_rect(RTGUI_WIDGET(me), &rect);
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/* get_rect函数获得是控件的相对位置，而鼠标事件给出的坐标是绝对坐标，需要做一个转换 */
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rtgui_widget_rect_to_device(RTGUI_WIDGET(me), &rect);
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/* 计算中心原点 */
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x = (rect.x2 + rect.x1)/2;
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y = (rect.y2 + rect.y1)/2;
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/* 比较鼠标坐标是否在圈内 */
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if ((mouse->x < x + 5 && mouse->x > x - 5) &&
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(mouse->y < y + 5 && mouse->y > y - 5))
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{
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/* 更改控件状态 */
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if (me->status & MYWIDGET_STATUS_ON) me->status = MYWIDGET_STATUS_OFF;
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else me->status = MYWIDGET_STATUS_ON;
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/* 刷新(重新绘制)控件 */
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rtgui_mywidget_ondraw(me);
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}
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}
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/* mywidget控件的事件处理函数 */
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rt_bool_t rtgui_mywidget_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
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{
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/* 调用事件处理函数时，widget指针指向控件本身，所以先获得相应控件对象的指针 */
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struct rtgui_mywidget* me = RTGUI_MYWIDGET(widget);
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switch (event->type)
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{
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case RTGUI_EVENT_PAINT:
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/* 绘制事件，调用绘图函数绘制 */
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rtgui_mywidget_ondraw(me);
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break;
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case RTGUI_EVENT_MOUSE_BUTTON:
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/* 鼠标事件 */
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rtgui_mywidget_onmouse(RTGUI_MYWIDGET(me), (struct rtgui_event_mouse*) event);
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break;
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/* 其他事件调用父类的事件处理函数 */
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default:
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return rtgui_widget_event_handler(widget, event);
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}
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return RT_FALSE;
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}
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/* 自定义控件的构造函数 */
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static void _rtgui_mywidget_constructor(rtgui_mywidget_t *mywidget)
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{
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/* 默认这个控件接收聚焦 */
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RTGUI_WIDGET(mywidget)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
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/* 初始化控件并设置事件处理函数 */
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rtgui_widget_set_event_handler(RTGUI_WIDGET(mywidget), rtgui_mywidget_event_handler);
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/* 初始状态时OFF */
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mywidget->status = MYWIDGET_STATUS_OFF;
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}
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/* 获得控件的类型 */
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rtgui_type_t *rtgui_mywidget_type_get(void)
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{
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/* 控件的类型是一个静态变量，默认是NULL */
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static rtgui_type_t *mywidget_type = RT_NULL;
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if (!mywidget_type)
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{
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/* 当控件类型不存在时，创建它，并指定这种类型数据的大小及指定相应的构造函数和析构函数 */
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mywidget_type = rtgui_type_create("mywidget", RTGUI_WIDGET_TYPE,
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sizeof(rtgui_mywidget_t),
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RTGUI_CONSTRUCTOR(_rtgui_mywidget_constructor), RT_NULL);
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}
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return mywidget_type;
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}
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/* 创建一个自定义控件 */
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struct rtgui_mywidget* rtgui_mywidget_create(rtgui_rect_t* r)
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{
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struct rtgui_mywidget* me;
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/* 让rtgui_widget创建出一个指定类型：RTGUI_MYWIDGET_TYPE类型的控件 */
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me = (struct rtgui_mywidget*) rtgui_widget_create (RTGUI_MYWIDGET_TYPE);
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if (me != RT_NULL)
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{
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rtgui_widget_set_rect(RTGUI_WIDGET(me), r);
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}
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return me;
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}
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/* 删除一个自定义控件 */
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void rtgui_mywidget_destroy(struct rtgui_mywidget* me)
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{
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rtgui_widget_destroy(RTGUI_WIDGET(me));
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}
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