edit_subitems.shtml.htm

mfc资料集合5

//

/////////////////////////////////////////////////////////////////////////////
// CInPlaceEdit window

class CInPlaceEdit : public CEdit
{
// Construction
public:
	CInPlaceEdit(int iItem, int iSubItem, CString sInitText);

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CInPlaceEdit)
	public:
	virtual BOOL PreTranslateMessage(MSG* pMsg);
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CInPlaceEdit();

	// Generated message map functions
protected:
	//{{AFX_MSG(CInPlaceEdit)
	afx_msg void OnKillFocus(CWnd* pNewWnd);
	afx_msg void OnNcDestroy();
	afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
private:
	int m_iItem;
	int m_iSubItem;
	CString m_sInitText;
	BOOL    m_bESC;	 	// To indicate whether ESC key was pressed
};

/////////////////////////////////////////////////////////////////////////////</FONT></TT></PRE>
The listing of the implementation file now follows. The CInPlaceEdit constructor
simply saves the values passed through its arguments and initializes m_bESC
to false. The overridden PreTranslateMessage() is to ascertain that certain
key strokes do make it to the edit control. The escape key and the enter
key are normally pre-translated by the CDialog or the CFormView object,
we therefore specifically check for these and pass it on to the edit control.
The check for GetKeyState( VK_CONTROL) makes sure that key combinations
such as Ctrl-C, Ctrl-V and Ctrl-X get forwarded to the edit control.

<P>OnKillFocus() sends of the LVN_ENDLABELEDIT notification and destroys
the edit control. The notification is sent to the parent of the list view
control and not to the list view control itself. When sending the notification,
the m_bESC member variable is used to determine whether to send a NULL
string.

<P>The OnNcDestroy() function is the appropriate place to destroy the C++
object.

<P>The OnChar() function ends the edit if the Escape or the Enter key is
pressed. It does this by setting focus to the list view control which force
the OnKillFocus() of the edit control to be called. For any other character,
the OnChar() function lets the base class function take care of it before
it tries to determine if the control needs to be resized. The function
first gets the extent of the new string using the proper font and then
compares it to the current dimension of the edit control. If the string
is too long to fit within the edit control, it resizes the edit control
after checking the parent window ( the list view control ) to determine
if there is space for the edit control to grow.

<P>The OnCreate() function creates the edit control and initializes it
with the proper values.
<BR>
<BR>
<PRE><TT><FONT COLOR="#990000">// InPlaceEdit.cpp : implementation file
//

#include "stdafx.h"
#include "InPlaceEdit.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CInPlaceEdit

CInPlaceEdit::CInPlaceEdit(int iItem, int iSubItem, CString sInitText)
:m_sInitText( sInitText )
{
	m_iItem = iItem;
	m_iSubItem = iSubItem;
	m_bESC = FALSE;
}

CInPlaceEdit::~CInPlaceEdit()
{
}


BEGIN_MESSAGE_MAP(CInPlaceEdit, CEdit)
	//{{AFX_MSG_MAP(CInPlaceEdit)
	ON_WM_KILLFOCUS()
	ON_WM_NCDESTROY()
	ON_WM_CHAR()
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CInPlaceEdit message handlers

BOOL CInPlaceEdit::PreTranslateMessage(MSG* pMsg)
{
	if( pMsg->message == WM_KEYDOWN )
	{
		if(pMsg->wParam == VK_RETURN
				|| pMsg->wParam == VK_DELETE
				|| pMsg->wParam == VK_ESCAPE
				|| GetKeyState( VK_CONTROL)
				)
		{
			::TranslateMessage(pMsg);
			::DispatchMessage(pMsg);
			return TRUE;		&nbsp;&nbsp;&nbsp;&nbsp;	// DO NOT process further
		}
	}

	return CEdit::PreTranslateMessage(pMsg);
}


void CInPlaceEdit::OnKillFocus(CWnd* pNewWnd)
{
	CEdit::OnKillFocus(pNewWnd);

	CString str;
	GetWindowText(str);

	// Send Notification to parent of ListView ctrl
	LV_DISPINFO dispinfo;
	dispinfo.hdr.hwndFrom = GetParent()->m_hWnd;
	dispinfo.hdr.idFrom = GetDlgCtrlID();
	dispinfo.hdr.code = LVN_ENDLABELEDIT;

	dispinfo.item.mask = LVIF_TEXT;
	dispinfo.item.iItem = m_iItem;
	dispinfo.item.iSubItem = m_iSubItem;
	dispinfo.item.pszText = m_bESC ? NULL : LPTSTR((LPCTSTR)str);
	dispinfo.item.cchTextMax = str.GetLength();

	GetParent()->GetParent()->SendMessage( WM_NOTIFY, GetParent()->GetDlgCtrlID(), 
					(LPARAM)&amp;dispinfo );

	DestroyWindow();
}

void CInPlaceEdit::OnNcDestroy()
{
	CEdit::OnNcDestroy();

	delete this;
}


void CInPlaceEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	if( nChar == VK_ESCAPE || nChar == VK_RETURN)
	{
		if( nChar == VK_ESCAPE )
			m_bESC = TRUE;
		GetParent()->SetFocus();
		return;
	}


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

	// Resize edit control if needed

	// Get text extent
	CString str;

	GetWindowText( str );
	CWindowDC dc(this);
	CFont *pFont = GetParent()->GetFont();
	CFont *pFontDC = dc.SelectObject( pFont );
	CSize size = dc.GetTextExtent( str );
	dc.SelectObject( pFontDC );
	size.cx += 5;			&nbsp;&nbsp;&nbsp;	// add some extra buffer

	// Get client rect
	CRect rect, parentrect;
	GetClientRect( &amp;rect );
	GetParent()->GetClientRect( &amp;parentrect );

	// Transform rect to parent coordinates
	ClientToScreen( &amp;rect );
	GetParent()->ScreenToClient( &amp;rect );

	// Check whether control needs to be resized
	// and whether there is space to grow
	if( size.cx > rect.Width() )
	{
		if( size.cx + rect.left &lt; parentrect.right )
			rect.right = rect.left + size.cx;
		else
			rect.right = parentrect.right;
		MoveWindow( &amp;rect );
	}
}

int CInPlaceEdit::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CEdit::OnCreate(lpCreateStruct) == -1)
		return -1;

	// Set the proper font
	CFont* font = GetParent()->GetFont();
	SetFont(font);

	SetWindowText( m_sInitText );
	SetFocus();
	SetSel( 0, -1 );
	return 0;
}</FONT></TT></PRE>


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