如何将按钮按下消息通知父对话框

Question

我想子类化一个 CButton 来处理 ON_WM_LBUTTONDOWN 消息。

DownButton.cpp:

#include "stdafx.h" 
#include "DownButton.h" 

//CDownButton 

IMPLEMENT_DYNAMIC(CDownButton, CButton) 

CDownButton::CDownButton() 
{ 
} 

CDownButton::~CDownButton() 
{ 
} 


BEGIN_MESSAGE_MAP(CDownButton, CButton) 
    ON_WM_LBUTTONDOWN() 
END_MESSAGE_MAP() 



// CDownButton message handlers 

void CDownButton::OnLButtonDown(UINT nFlags, CPoint point) 
{ 
}

DownButton.h

#pragma once 


// CDownButton 

class CDownButton : public CButton 
{ 
    DECLARE_DYNAMIC(CDownButton) 

public: 
    CDownButton(); 
    virtual ~CDownButton(); 

protected: 
    DECLARE_MESSAGE_MAP() 
public: 
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point); 
};

但是如何通知包含此按钮的对话框发生这种情况？似乎它唯一可以接收的消息是 ON_BN_CLICKED.

Answer 1

您需要在 OnLButtonDown 中将消息重新发送给父项 - 事件：

void CDownButton::OnLButtonDown(UINT nFlags, CPoint point) 
{ 
   // do what you want to do ...

   GetParent()->SendMessage(WM_COMMAND, GetDlgCtrlID() | WM_LBUTTONDOWN << 16, (LONG) GetSafeHwnd());
}

如何将按钮按下消息通知父对话框

How to notify the parent dialog of a button down message

c++

mfc

subclassing