C++ 设计模式之（观察者模式）

天下 — Mon, 11 Jan 2016 08:34:00 GMT

//UiBase.h
#pragma once
#include

namespace dui
{
    using std::list;
    struct Event
    {
        int        type;
        void*    sender;
        int        argl;
        char*    argu;
    };
    class IControl{
    public:
        virtual bool OnCreate(Event* _event)=0;
        //virtual bool OnPaint(Event* _event)=0;
    };

    typedef bool (IControl::*EVENT_PROC)(Event*);

    class EventManager
    {
    public:
        bool Notify(EVENT_PROC method,Event* _event);
        void AddNotifier(IControl* control);
        void RemoveNotifier(IControl* control);
    public:
        list m_ctrls;
    };



    class Button:public IControl
    {
    public:
        virtual bool OnCreate(Event* _event);
        //virtual bool OnPaint(Event* _event);
    };
    class Edit:public IControl
    {
    public:
        virtual bool OnCreate(Event* _event);
        //virtual bool OnPaint(Event* _event);
    };

}

//UiBase.cpp
#include "stdafx.h"
#include "UiBase.h"

using namespace dui;

void EventManager::AddNotifier(IControl* control)
{
    m_ctrls.push_back(control);
}
void EventManager::RemoveNotifier(IControl* control)
{
    list::iterator iter;
    for(iter = m_ctrls.begin();iter!=m_ctrls.end();)
    {
        if ( *iter == control){
            iter = m_ctrls.erase(iter);
        }
        else{
            iter++;
        }
    }
}
bool EventManager::Notify(EVENT_PROC method,Event* _event)
{
    printf("\r\n\r\nEventManager::Notify() Entry\r\n--------------------------------------\r\n");
    list::iterator iter;
    for(iter = m_ctrls.begin();iter!=m_ctrls.end();iter++)
    {
        (*iter->*method)(_event);
        //if (!(*iter->*method)(_event))
        //    return false;
    }
    return true;
}

bool Button::OnCreate(Event* _event){
    printf("Button OnCreate() Entry,event.type=%d \r\n",_event->type);
    return true;
}

bool Edit::OnCreate(Event* _event){
    printf("Edit OnCreate() Entry,event.type=%d \r\n",_event->type);
    return true;
}

//Main.cpp

#include "stdafx.h"

#include "UiBase.h"

int _tmain()
{
    using namespace dui;

    Event _event;
    _event.type = 0x1001;

    EventManager event_manager;

    Button* btn = new Button();
    event_manager.AddNotifier(btn);

    Edit* edit = new Edit();
    event_manager.AddNotifier(edit);

    event_manager.Notify(&IControl::OnCreate,&_event);


    event_manager.RemoveNotifier(btn);
    event_manager.Notify(&IControl::OnCreate,&_event);
    system("pause");
    return 0;
}

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C++ 设计模式之（观察者模式）