求助：如何使用view的句柄函数

发布于 2012-06-11 14:02:46 浏览：3190 订阅该版

在一个workbench上建立三个view，每个view都建立自己的事件处理句柄函数（目前先做按键事件），希望按键可以在不同的view上进行不同的操作。当monitor_view_event_handler句柄函数的键盘事件在demo_workbench_event_handler句柄函数中时是可以正常执行的；而当建立view的句柄函数后就只能执行一次按键事件后就不再进入句柄函数（change view按键依然有效），无法实现正常的按键事件功能，请问如何才能实现按键在不同的句柄函数中的不同操作（相同按键在不同view中可以实现不同的功能）？
    另外，请助一下关于在句柄函数中return RT_FALSE的用法：当保留demo_workbench_event_handler句柄函数中的return RT_FALSE或return RT_TRUE时会造成view句柄函数一次按键事件也不能正常执行；而是否保留monitor_view_event_handler句柄函数中的return RT_FALSE和return RT_TRUE对代码现状没有改变，请问是否当view句柄函数增加多个时会有影响，是否可以像文档中所说的向下一个view继续进行处理？求助关于return RT_FALSE与return RT_TRUE在句柄处理函数中的用法。
    最后，后续还需在view句柄函数中实现绘图事件，是否在相应句柄函数中用if语句判断增加PAINT事件即可实现，多个view中实现不同PAINT事件是否可能？请给予指导，谢谢！ 下为几个主要函数的代码：

static rt_bool_t demo_workbench_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
{
	
	// 我们目前只对按键事件感兴趣。如果当前workbench处于模式显示状态，忽略它
	if((event->type==RTGUI_EVENT_KBD) && !RTGUI_WORKBENCH_IS_MODAL_MODE(RTGUI_WORKBENCH(widget)))
	{
		struct rtgui_event_kbd* ekbd = (struct rtgui_event_kbd*)event;
		if (ekbd->type == RTGUI_KEYDOWN)
		{
			switch(ekbd->key)
			{  	
				
				/*		    		
				case RTGUIK_UP:	
					//焦点控件向上移动
			   		chn_focused_row_pre();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_DOWN:
					//焦点控件向下移动
					chn_focused_row_next();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_LEFT:
					//焦点控件向左移动
					chn_focused_pre();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_RIGHT:
					//焦点控件向右移动
					chn_focused_next();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				//set
				case RTGUIK_SPACE:
					//triggle button window		
					rtgui_button_set_onbutton(channel_para[uch_focused_flag].button_name,demo_win_onbutton);
					//rtgui_widget_focus(RTGUI_WIDGET(win_button[0]));					 
					
					break;
			      */

//change view
				case RTGUIK_PAGEUP:
					demo_view_next(RT_NULL, RT_NULL);
					//break;
					//return RT_TRUE;
					
				//trigger button of autowin
				case RTGUIK_RETURN:						
					rtgui_button_set_onbutton(channel_para[uch_focused_flag].button_name,demo_autowin_onbutton);
				 
					//	return RT_FALSE;
					
					break;
				default:
					break;
			}						
			
			//return RT_TRUE;	
		}
		//return RT_FALSE;
	} 	
	// 如果不是按键事件，使用workbench原来的事件处理函数处理 
	return rtgui_workbench_event_handler(widget, event);
}

static rt_bool_t monitor_view_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
{
	
	// 目前只对按键事件感兴趣。
	if ((event->type == RTGUI_EVENT_KBD))
	{
		struct rtgui_event_kbd* ekbd = (struct rtgui_event_kbd*)event;

if (ekbd->type == RTGUI_KEYDOWN)
		{
			switch(ekbd->key)
			{  			    		
					
				case RTGUIK_UP:	
					//焦点控件向上移动
			   		chn_focused_row_pre();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_DOWN:
					//焦点控件向下移动
					chn_focused_row_next();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_LEFT:
					//焦点控件向左移动
					chn_focused_pre();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_RIGHT:
					//焦点控件向右移动
					chn_focused_next();
					rtgui_widget_focus(RTGUI_WIDGET(channel_para[uch_focused_flag].button_name ));
					break;
				case RTGUIK_SPACE:
					//triggle button window		
					rtgui_button_set_onbutton(channel_para[uch_focused_flag].button_name,demo_win_onbutton);
					//rtgui_widget_focus(RTGUI_WIDGET(win_button[0]));				
					break;
				
				//trigger autowin
				case RTGUIK_RETURN:					
					rtgui_button_set_onbutton(channel_para[uch_focused_flag].button_name,demo_autowin_onbutton);							
					break;
				default:
					break;
			}						
			
			//return RT_TRUE;	
		}
		return RT_FALSE;
	}

// 如果不是键盘事件，使用view原来的事件处理函数处理 
	return rtgui_view_event_handler(widget, event);
}

rtgui_view_t* page_monitor_view(rtgui_workbench_t* workbench)
{
	rtgui_rect_t rect;
	rtgui_view_t* view;
	rtgui_button_t* button;	
	rt_uint16_t cnt;

// 先创建一个演示用的视图
	view = creat_page_view(workbench, "防区监控");

// 获得视图的位置信息 
	demo_view_get_rect(view, &rect);
	
	for(cnt=0;cnt<16;cnt++)
	{
		rect.x1 = channel_para[cnt].rect.x1;
		rect.x2 = channel_para[cnt].rect.x2;
		rect.y1 = channel_para[cnt].rect.y1;
		rect.y2 = channel_para[cnt].rect.y2;
		//创建一个button控件 
		button = rtgui_button_create(channel_para[cnt].chn_text);
		RTGUI_WIDGET_FOREGROUND(RTGUI_WIDGET(button)) = channel_para[cnt].text_color;
		RTGUI_WIDGET_BACKGROUND(RTGUI_WIDGET(button)) = channel_para[cnt].back_color;
		//RTGUI_WIDGET_FOREGROUND(RTGUI_WIDGET(button)) = channel_para[cnt].back_color;
		//RTGUI_WIDGET_FOREGROUND(RTGUI_WIDGET(button)) = channel_para[cnt].text_color;
		//RTGUI_WIDGET_BACKGROUND(RTGUI_WIDGET(button)) = channel_para[cnt].text_color;
		//设置button的位置  
		rtgui_widget_set_rect(RTGUI_WIDGET(button), &rect);
		// view是一个container控件，调用add_child方法添加这个button控件  
		rtgui_container_add_child(RTGUI_CONTAINER(view), RTGUI_WIDGET(button));
		channel_para[cnt].button_name = button;		
	}
	
	//rtgui_widget_focus(RTGUI_WIDGET(channel_para[0].button_name ));

return view;
}

void workbench_entry(void* parameter)
{
	rt_mq_t mq;
	struct rtgui_workbench* workbench;
	rtgui_view_t* monitor_view,system_view,record_view;

//创建GUI应用需要的消息队列
	mq = rt_mq_create("workbench", 32, 32, RT_IPC_FLAG_FIFO);
	//注册当前线程为GUI线程 
	rtgui_thread_register(rt_thread_self(), mq);
	//创建一个工作台 
	workbench = rtgui_workbench_create("main", "workbench");
	if (workbench == RT_NULL) return; 
	//workbench handler 函数
	rtgui_widget_set_event_handler(RTGUI_WIDGET(workbench), demo_workbench_event_handler);

//监控界面显示
	monitor_view = page_monitor_view(workbench);
	//monitor_view handler 函数
	rtgui_widget_set_event_handler(RTGUI_WIDGET(monitor_view),monitor_view_event_handler);
	/* this view can be focused */
        //RTGUI_WIDGET(view)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
 	
	system_view = page_system_view(workbench);
	// system_view handler 函数
	//rtgui_widget_set_event_handler(RTGUI_WIDGET(system_view),system_view_event_handler);
	//record_view handler 函数
	record_view = page_record_view(workbench);
	//rtgui_widget_set_event_handler(RTGUI_WIDGET(record_view),record_view_event_handler);

// 显示视图 
	current_view_show();	
	// 执行工作台事件循环
	rtgui_workbench_event_loop(workbench);
	//去注册GUI线程
	rtgui_thread_deregister(rt_thread_self());
	rt_mq_delete(mq);
}