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_BC(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_BC(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_BC(dc) = green;
else
RTGUI_DC_BC(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);
}
}
/* mywidget控件的事件处理函数 */
rt_bool_t rtgui_mywidget_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
{
/* 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 */
struct rtgui_mywidget* me = 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:
return rtgui_widget_event_handler(widget, event);
}
return RT_FALSE;
}
/* 自定义控件的构造函数 */
static void _rtgui_mywidget_constructor(rtgui_mywidget_t *mywidget)
{
/* 默认这个控件接收聚焦 */
RTGUI_WIDGET(mywidget)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
/* 初始化控件并设置事件处理函数 */
rtgui_widget_set_event_handler(RTGUI_WIDGET(mywidget), rtgui_mywidget_event_handler);
/* 初始状态时OFF */
mywidget->status = MYWIDGET_STATUS_OFF;
}
/* 获得控件的类型 */
rtgui_type_t *rtgui_mywidget_type_get(void)
{
/* 控件的类型是一个静态变量默认是NULL */
static rtgui_type_t *mywidget_type = RT_NULL;
if (!mywidget_type)
{
/* 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 */
mywidget_type = rtgui_type_create("mywidget", RTGUI_WIDGET_TYPE,
sizeof(rtgui_mywidget_t),
RTGUI_CONSTRUCTOR(_rtgui_mywidget_constructor), RT_NULL);
}
return mywidget_type;
}
/* 创建一个自定义控件 */
struct rtgui_mywidget* rtgui_mywidget_create(rtgui_rect_t* r)
{
struct rtgui_mywidget* me;
/* 让rtgui_widget创建出一个指定类型RTGUI_MYWIDGET_TYPE类型的控件 */
me = (struct rtgui_mywidget*) rtgui_widget_create (RTGUI_MYWIDGET_TYPE);
if (me != RT_NULL)
{
rtgui_widget_set_rect(RTGUI_WIDGET(me), r);
}
return me;
}
/* 删除一个自定义控件 */
void rtgui_mywidget_destroy(struct rtgui_mywidget* me)
{
rtgui_widget_destroy(RTGUI_WIDGET(me));
}