rt-thread/examples/gui/mywidget.c

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#include <rtgui/dc.h>
#include "mywidget.h"
/* 控件绘图函数 */
static void rtgui_mywidget_ondraw(struct rtgui_mywidget* me)
{
struct rtgui_dc* dc;
struct rtgui_rect rect;
rt_uint16_t x, y;
/* 获得目标DC开始绘图 */
dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(me));
if (dc == RT_NULL) return;
/* 获得窗口的尺寸 */
rtgui_widget_get_rect(RTGUI_WIDGET(me), &rect);
/* 绘制背景色 */
rtgui_dc_set_color(dc, white);
rtgui_dc_fill_rect(dc, &rect);
/* 计算中心原点 */
x = (rect.x2 + rect.x1)/2; y = (rect.y2 + rect.y1)/2;
/* 绘制十字架 */
rtgui_dc_set_color(dc, black);
rtgui_dc_draw_hline(dc, rect.x1, rect.x2, y);
rtgui_dc_draw_vline(dc, x, rect.y1, rect.y2);
/* 根据状态绘制圆圈 */
if (me->status == MYWIDGET_STATUS_ON)
rtgui_dc_set_color(dc, green);
else
rtgui_dc_set_color(dc, red);
rtgui_dc_fill_circle(dc, x, y, 5);
/* 结束绘图 */
rtgui_dc_end_drawing(dc);
return;
}
/* 鼠标事件处理函数 */
static void rtgui_mywidget_onmouse(struct rtgui_mywidget* me, struct rtgui_event_mouse* mouse)
{
struct rtgui_rect rect;
rt_uint16_t x, y;
/* 仅对鼠标抬起动作进行处理 */
if (!(mouse->button & RTGUI_MOUSE_BUTTON_UP)) return;
/* 获得控件的位置 */
rtgui_widget_get_rect(RTGUI_WIDGET(me), &rect);
/* 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 */
rtgui_widget_rect_to_device(RTGUI_WIDGET(me), &rect);
/* 计算中心原点 */
x = (rect.x2 + rect.x1)/2; y = (rect.y2 + rect.y1)/2;
/* 比较鼠标坐标是否在圈内 */
if ((mouse->x < x + 5 && mouse->x > x - 5) &&
(mouse->y < y + 5 && mouse->y > y - 5))
{
/* 更改控件状态 */
if (me->status & MYWIDGET_STATUS_ON) me->status = MYWIDGET_STATUS_OFF;
else me->status = MYWIDGET_STATUS_ON;
/* 刷新(重新绘制)控件 */
rtgui_mywidget_ondraw(me);
}
}
static rt_bool_t rtgui_mywidget_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
{
struct rtgui_mywidget* me = (struct rtgui_mywidget*)widget;
switch (event->type)
{
case RTGUI_EVENT_PAINT:
/* 绘制事件,调用绘图函数绘制 */
rtgui_mywidget_ondraw(me);
break;
case RTGUI_EVENT_MOUSE_BUTTON:
/* 鼠标事件 */
rtgui_mywidget_onmouse(RTGUI_MYWIDGET(me), (struct rtgui_event_mouse*) event);
break;
/* 其他事件调用父类的事件处理函数 */
default:
rtgui_widget_event_handler(widget, event);
}
return RT_FALSE;
}
static void _rtgui_mywidget_constructor(rtgui_mywidget_t *mywidget)
{
/* 初始化控件并设置事件处理函数 */
RTGUI_WIDGET(mywidget)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
rtgui_widget_set_event_handler(RTGUI_WIDGET(mywidget), rtgui_mywidget_event_handler);
mywidget->status = MYWIDGET_STATUS_OFF;
}
static void _rtgui_mywidget_destructor(rtgui_mywidget_t *mywidget)
{
}
rtgui_type_t *rtgui_mywidget_type_get(void)
{
static rtgui_type_t *mywidget_type = RT_NULL;
if (!mywidget_type)
{
mywidget_type = rtgui_type_create("mywidget", RTGUI_WIDGET_TYPE,
sizeof(rtgui_mywidget_t),
RTGUI_CONSTRUCTOR(_rtgui_mywidget_constructor),
RTGUI_DESTRUCTOR(_rtgui_mywidget_destructor));
}
return mywidget_type;
}
struct rtgui_mywidget* rtgui_mywidget_create(rtgui_rect_t* r)
{
struct rtgui_mywidget* me;
me = (struct rtgui_mywidget*) rtgui_widget_create (RTGUI_MYWIDGET_TYPE);
if (me != RT_NULL)
{
rtgui_widget_set_rect(RTGUI_WIDGET(me), r);
}
return me;
}
void rtgui_mywidget_destroy(struct rtgui_mywidget* me)
{
rtgui_widget_destroy(RTGUI_WIDGET(me));
}