Dynamically switchable multi-purpose control

////////////////////////////////////////////////////////////////////////////
// File:	BrowseEdit.cpp
// Version:	1.0.0.1
// Created:	05-Mar-2002
//
// Author:	Paul S. Vickery
// E-mail:	paul@vickeryhome.freeserve.co.uk
//
// Edit control with embedded ... (ellipsis) button
//
// You are free to use or modify this code, with no restrictions, other than
// you continue to acknowledge me as the original author in this source code,
// or any code derived from it.
//
// If you use this code, or use it as a base for your own code, it would be 
// nice to hear from you simply so I know it's not been a waste of time!
//
// Copyright (c) 2001-2002 Paul S. Vickery
//
////////////////////////////////////////////////////////////////////////////
// Version History:
//
// Version 1.0.0.1 - 05-Mar-2002
// =============================
// Fixes problem with a BrowseEdit created with ES_READONLY not having button
// disabled.
//
// Version 1.0.0.0 - 27-Jul-2001
// =============================
// Initial version.
// 
////////////////////////////////////////////////////////////////////////////
// PLEASE LEAVE THIS HEADER INTACT
////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "BrowseEdit.h"

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

#define ID_EDIT		1
#define ID_BUTTON	2

/////////////////////////////////////////////////////////////////////////////
// CBrowseEditButton

BEGIN_MESSAGE_MAP(CBrowseEditButton, CButton)
	//{{AFX_MSG_MAP(CBrowseEditButton)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBrowseEditButton message handlers

void CBrowseEditButton::OnLButtonUp(UINT nFlags, CPoint point) 
{
  CButton::OnLButtonUp(nFlags, point);
  // set the focus back to the parent, and stop it looking like the default button
  ModifyStyle(BS_DEFPUSHBUTTON, 0);
  GetParent()->SetFocus();
}

void CBrowseEditButton::OnLButtonDown(UINT nFlags, CPoint point) 
{
  CButton::OnLButtonDown(nFlags, point);
  // stop it looking like the default button
  ModifyStyle(BS_DEFPUSHBUTTON, 0);
}

/////////////////////////////////////////////////////////////////////////////
// CBrowseEdit

CBrowseEdit::CBrowseEdit()
{
  m_pEdit = new CEdit;
  m_pBtn = new CBrowseEditButton;
}

CBrowseEdit::~CBrowseEdit()
{
  if (m_pEdit != NULL)
    delete m_pEdit;
  if (m_pBtn != NULL)
    delete m_pBtn;
}

BEGIN_MESSAGE_MAP(CBrowseEdit, CWnd)
	//{{AFX_MSG_MAP(CBrowseEdit)
	ON_WM_CREATE()
	ON_WM_ENABLE()
	ON_WM_SETFOCUS()
	ON_WM_SIZE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBrowseEdit message handlers

void CBrowseEdit::PreSubclassWindow() 
{
  CWnd::PreSubclassWindow();

#if 0

  CRect rc(0, 0, 0, 0);

  // Get the edit control styles and create the edit control
  // we want to isolate the edit styles from the style, and
  // visible and disabled if specified
  // then add in WS_CHILD
  DWORD dwStyle = GetStyle();
  DWORD dwStyleEdit = dwStyle & (WS_VISIBLE | WS_DISABLED | 0x3DFFL);
  dwStyleEdit |= WS_CHILD | WS_CLIPSIBLINGS;
  if (!m_pEdit->Create(dwStyleEdit, rc, this, ID_EDIT))
    return;

  // Get the button styles and create the button
  // just allow visible and disabled from the specified style
  // and add WS_CHILD and BS_PUSHBUTTON
  DWORD dwStyleBtn = dwStyle & (WS_VISIBLE | WS_DISABLED);
  dwStyleBtn |= WS_CHILD | WS_CLIPSIBLINGS | BS_PUSHBUTTON;
  if (!m_pBtn->Create("...", dwStyleBtn, rc, this, ID_BUTTON))
    return;

  GetWindowRect(&rc);
  int cx = rc.Width();
  int cy = rc.Height();
  CRect rcEdit(0, 0, cx - cy, cy);
  CRect rcBtn(cx - cy, 0, cy, cy);
  m_pEdit->MoveWindow(0, 0, cx - cy, cy);
  m_pBtn->MoveWindow(cx - cy, 0, cy, cy);

  // set the font to this control's font
  CFont* pFont = GetFont();
  m_pEdit->SetFont(pFont);
  m_pBtn->SetFont(pFont);
#endif  
}

BOOL CBrowseEdit::Create(DWORD dwStyle, const RECT &rect, CWnd *pParentWnd, UINT nID)
{
  if (!CWnd::Create(NULL, NULL, dwStyle, rect, pParentWnd, nID))
    return FALSE;

  return TRUE;
}

int CBrowseEdit::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
  if (CWnd::OnCreate(lpCreateStruct) == -1)
	  return -1;

  CRect rc(0, 0, 0, 0);

  // Get the edit control styles and create the edit control
  // we want to isolate the edit styles from the style, and
  // visible and disabled if specified
  // then add in WS_CHILD
  DWORD dwStyleEdit = lpCreateStruct->style & (WS_VISIBLE | WS_DISABLED | 0x3DFFL);
  dwStyleEdit |= WS_CHILD | WS_CLIPSIBLINGS;
  if (!m_pEdit->Create(dwStyleEdit, rc, this, ID_EDIT))
    return -1;

  // Get the button styles and create the button
  // just allow visible and disabled from the specified style
  // and add WS_CHILD and BS_PUSHBUTTON
  DWORD dwStyleBtn = lpCreateStruct->style & (WS_VISIBLE | WS_DISABLED);
  dwStyleBtn |= WS_CHILD | WS_CLIPSIBLINGS | BS_PUSHBUTTON;
  if (!m_pBtn->Create("...", dwStyleBtn, rc, this, ID_BUTTON))
    return -1;
  
  // if the edit control is readonly, disable the button
  if (dwStyleEdit & ES_READONLY)
    m_pBtn->EnableWindow(FALSE);

  return 0;
}

void CBrowseEdit::OnEnable(BOOL bEnable) 
{
  CWnd::OnEnable(bEnable);

  m_pEdit->EnableWindow(bEnable);
  m_pBtn->EnableWindow(bEnable);
}

void CBrowseEdit::OnSetFocus(CWnd* pOldWnd) 
{
  CWnd::OnSetFocus(pOldWnd);

  // set the focus to the edit control
  m_pEdit->SetFocus();
  m_pEdit->SetSel(0, -1);
}

void CBrowseEdit::OnSize(UINT nType, int cx, int cy) 
{
  CWnd::OnSize(nType, cx, cy);

  // size the child controls
  m_pEdit->MoveWindow(0, 0, cx - cy, cy);
  m_pBtn->MoveWindow(cx - cy, 0, cy, cy);
}

BOOL CBrowseEdit::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
{
  // pass the notifications from the controls to the parent
  CWnd* pParent = GetParent();
  if (pParent != NULL)
  {
    NMHDR* pnmhdr = (NMHDR*)lParam;
    pnmhdr->idFrom = GetDlgCtrlID();
    pnmhdr->hwndFrom = GetSafeHwnd();
    *pResult = pParent->SendMessage(WM_NOTIFY, (WPARAM)GetDlgCtrlID(), lParam);
    return TRUE;
  }
  return CWnd::OnNotify(wParam, lParam, pResult);
}

BOOL CBrowseEdit::OnCommand(WPARAM wParam, LPARAM lParam) 
{
  // pass the commands from the controls to the parent
  CWnd* pParent = GetParent();
  if (pParent != NULL)
  {
    if (!pParent->SendMessage(WM_COMMAND, MAKEWPARAM(GetDlgCtrlID(), HIWORD(wParam)), (LPARAM)GetSafeHwnd()))
      return TRUE;
  }
  return CWnd::OnCommand(wParam, lParam);
}