rt-thread-official/examples/gui/mywidget.c

#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<E5A78B><E7BB98>?*/
	dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(me));
	if (dc == RT_NULL) return;

	/* 获得窗口的尺<E79A84><E5B0BA>?*/
	rtgui_widget_get_rect(RTGUI_WIDGET(me), &rect);
	/* 绘制背景<E8838C><E699AF>?*/
	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<E58D81><E5AD97>?*/
	RTGUI_DC_FC(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<E588B6><E59C86>?*/
	if (me->status == MYWIDGET_STATUS_ON)
		RTGUI_DC_FC(dc) = green;
	else
		RTGUI_DC_FC(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<E79A84><E4BD8D>?*/
	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<E4B8AA><E8BDAC>?*/
	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<E59CA8><E59C88>?*/
	if ((mouse->x < x + 5 && mouse->x > x - 5) &&
			(mouse->y < y + 5 && mouse->y > y - 5))
	{
		/* 更改控件状<E4BBB6><E78AB6>?*/
		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<E79086><E587BD>?*/
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<E79A84><E68C87>?*/
	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<E695B0><E7BB98>?*/
		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<E79086><E587BD>?*/
	default:
		return rtgui_widget_event_handler(widget, event);
	}

	return RT_FALSE;
}

/* 自定义控件的构造函<E980A0><E587BD>?*/
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;
}

DEFINE_CLASS_TYPE(mywidget, "mywidget", 
	RTGUI_WIDGET_TYPE,
	_rtgui_mywidget_constructor,
	RT_NULL,
	sizeof(struct rtgui_mywidget));

/* 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<E79A84><E68EA7>?*/
	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));
}