Re: CEdit AND enter-key

"RAN" <nijenhuis@wish.nl> ha scritto nel messaggio
news:1186750597.981398.160060@x35g2000prf.googlegroups.com...


If you want to intercept the enter key from the edit-box, you may want to
derive a class from CEdit, and:

1. override OnGetDlgCode (WM_GETDLGCODE message), to make sure that the
derived edit-box receives the Enter key event

2. override OnChar (WM_CHAR message), to intercept the enter key
(VK_RETURN), and do proper action.

Here you can find a little sample I wrote of a CEdit-derived class, which
displays a message-box with the content of the edit-box when Enter key is
pressed.

This is the header file for CEditEnter sample class:

<CODE file="EditEnter.h">
#pragma once

//////////////////////////////////////////////////////////////////////////
// CLASS: CEditEnter
// DESCR: An edit control that intercepts the enter key
//////////////////////////////////////////////////////////////////////////
class CEditEnter : public CEdit
{
    DECLARE_DYNAMIC(CEditEnter)

public:
    CEditEnter();
    virtual ~CEditEnter();

public:

protected:

    // Called when enter key is pressed
    virtual void OnKeyEnterPressed();

protected:
    DECLARE_MESSAGE_MAP()
public:
    afx_msg UINT OnGetDlgCode();
    afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
};

</CODE>

And this is the implementation file:

<CODE file="EditEnter.cpp">
// EditEnter.cpp : implementation file
//

#include "stdafx.h"
#include "EditEnter.h"

// CEditEnter

IMPLEMENT_DYNAMIC(CEditEnter, CEdit)
CEditEnter::CEditEnter()
{
}

CEditEnter::~CEditEnter()
{
}

BEGIN_MESSAGE_MAP(CEditEnter, CEdit)
    ON_WM_GETDLGCODE()
    ON_WM_CHAR()
END_MESSAGE_MAP()

// CEditEnter message handlers

UINT CEditEnter::OnGetDlgCode()
{
    // Assure we will receive Enter key
    return CEdit::OnGetDlgCode() | DLGC_WANTALLKEYS;
}

void CEditEnter::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    if ( nChar == VK_RETURN )
    {
        // Intercept return key and call the handler
        OnKeyEnterPressed();
    }

    CEdit::OnChar(nChar, nRepCnt, nFlags);
}

void CEditEnter::OnKeyEnterPressed()
{
    //
    // Do something when Enter key is pressed
    //

    CString msg( _T("User entered:\n\n") );

    CString text;
    GetWindowText(text);

    msg += text;

    AfxMessageBox( msg );
}

</CODE>

Giovanni