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Posted 8 Oct 2008

Control Message Bar

, 23 Oct 2008 CPOL
Code to add a message bar to virtually any existing Windows control.
// File:	CtrlMessageBar.h
// Version:	1.0
// Created:	08-Oct-2008
// Author:	Paul S. Vickery
// E-mail:
// Class to add a message-bar to (virtually) any control.
// 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) 2005-2008 Paul S. Vickery
// Version History:
// Version 1.0 - 08-Oct-2008
// =========================
// Initial version

#pragma once

// CCtrlMessageBarDblSubclassWnd based on CDblSubclassWnd class             //
// Written By Ralph Varjabedian, 08/02/2002,           //
// (see         //
// Stripped down by Paul S. Vickery for use in CCtrlMessageBar              //

// special hit-test codes for message bar area
#define HTMESSAGEBAR	  0x100

#define CLR_DEFAULT             0xFF000000L
#endif // CLR_DEFAULT

class CCtrlMessageBar;

/* return FALSE to show default menu */
typedef BOOL (*PFNSHOWMENUCALLBACK)(CCtrlMessageBar* pBar, CWnd* pCtrl, UINT nHitTest, CPoint point);

// class to add a message bar strip to the top of a control window
class CCtrlMessageBar : public CObject
  virtual ~CCtrlMessageBar();

  BOOL Attach(CWnd* pCtrl);
  BOOL Attach(CWnd& ctrl) { return Attach(&ctrl); }
  BOOL Attach(CWnd* pDlg, UINT nID);
  CWnd* Detach();

  CWnd* GetCtrl() const { return m_pCtrlMessageBarThis; }
  BOOL IsAttached() const { return GetCtrl() != NULL; }

  void SetImageList(CImageList* piml);

  virtual void SetText(LPCTSTR lpszText, UINT nImage = -1, BOOL bShow = TRUE);
  virtual CString GetText() const { return m_sMessageBarText; }

  virtual void Show(BOOL bShow = TRUE);
  virtual BOOL IsShown() const { return m_bShowMessageBar; }

  void SetImage(UINT nImage, BOOL bShow = TRUE);
  UINT GetImage() const { return m_nMessageBarImage; }

  CRect GetRect(BOOL bDrawing = FALSE) const;
  CRect GetCloseButtonRect(CRect& rc) const;
  UINT GetMessageHeight() const { return m_nMessageBarHeight; }

  void SetCloseButton(BOOL bShow = TRUE) { m_bMessageBarCloseButton = bShow; }
  BOOL GetCloseButton() const { return m_bMessageBarCloseButton; }

  void SetWrapText(BOOL bWrap = TRUE) { m_bWrapMessageBarText = bWrap; Show(m_bShowMessageBar); }
  BOOL GetWrapText() const { return m_bWrapMessageBarText; }

  void SetHighlightOnMouseOver(BOOL bHighlight = TRUE) { m_bHighlightOnMouseOver = bHighlight; }
  BOOL GetHighlightOnMouseOver() const { return m_bHighlightOnMouseOver; }

  void SetColours(COLORREF crBackgroundNormal = CLR_DEFAULT, COLORREF crTextNormal = CLR_DEFAULT, COLORREF crBackgroundHilite = CLR_DEFAULT, COLORREF crTextHilite = CLR_DEFAULT);
  void GetColours(COLORREF& crBackgroundNormal, COLORREF& crTextNormal, COLORREF& crBackgroundHilite, COLORREF& crTextHilite) const;

  void SetResize(BOOL bResize = TRUE) { m_bResize = bResize; }
  BOOL GetResize() const { return m_bResize; }

  static CCtrlMessageBar* GetMessageBarCtrl(CWnd* pCtrl);

  void SetShowMenuCallback(PFNSHOWMENUCALLBACK pfnShowMenuCallback) { m_pfnShowMenuCallback = pfnShowMenuCallback; }

  LRESULT DoWindowProc(UINT message, WPARAM wParam, LPARAM lParam, LRESULT lResult);

  void DoNcPaint();
  void DoNcCalcSize(BOOL bCalcValidRects, NCCALCSIZE_PARAMS FAR* lpncsp);
  UINT DoNcHitTest(CPoint point, UINT nCode);
  void DoNcMouseButtonMsg(UINT nMsg, UINT nHitTest, CPoint point);

  virtual void GetCtrlMessageBarOffset(CRect& rcOffset) const { rcOffset.SetRectEmpty(); }

  BOOL m_bShowMessageBar;
  CString m_sMessageBarText;
  UINT m_nMessageBarHeight;
  CImageList m_imlMessageBar;
  UINT m_nMessageBarImage;
  BOOL m_bMessageBarCloseButton;
  BOOL m_bWrapMessageBarText;
  BOOL m_bResize;
  PFNSHOWMENUCALLBACK m_pfnShowMenuCallback;

  BOOL m_bTextTruncated;
  BOOL m_bHighlightOnMouseOver;
  BOOL m_bMouseHover;

  COLORREF m_crBackgroundNormal;
  COLORREF m_crTextNormal;
  COLORREF m_crBackgroundHilite;
  COLORREF m_crTextHilite;

  CToolTipCtrl m_tipMessageBar;

  class _CCtrlMessageBarDblSubclassWnd  
	  static BOOL SubclassWindow(HWND hWnd, CCtrlMessageBar* pBar = NULL);
	  static void UnSubclassWindow(HWND hWnd);
	  static BOOL IsSubclassed(HWND hWnd);
	  friend LRESULT AFXAPI OurCallWndProc(CWnd* pWnd, HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam);

	  // _CTempWndSubclass window
	  class _CTempWndSubclass : public CWnd
	  // Construction
			  { InterlockedIncrement(&_m_lObjectCount); }
		  static long _m_lObjectCount;
		  virtual ~_CTempWndSubclass()
			  { InterlockedDecrement(&_m_lObjectCount); }
		  void SetMessageBar(CCtrlMessageBar* pBar) { m_pBar = pBar; }
		  CCtrlMessageBar* GetMessageBar() const { return m_pBar; }
		  CCtrlMessageBar* m_pBar;
		  afx_msg void OnNcDestroy()
			  { CWnd::OnNcDestroy(); delete this; /* auto delete the object */ }

  CWnd* m_pCtrlMessageBarThis;  // the ctrl we are supporting

typedef CCtrlMessageBar::_CCtrlMessageBarDblSubclassWnd CCtrlMessageBarDblSubclassWnd;
typedef CCtrlMessageBar::_CCtrlMessageBarDblSubclassWnd::_CTempWndSubclass _CTempWndSubclass;

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Paul Vickery
Software Developer (Senior)
United Kingdom United Kingdom
Originally from an electronics background, I moved into software in 1996, partly as a result of being made redundant, and partly because I was very much enjoying the small amount of coding (in-at-the-deep-end-C) that I had been doing!

I swiftly moved from C to C++, and learned MFC, and then went on to real-time C on Unix. After this I moved to the company for which I currently work, which specialises in Configuration Management software, and currently program mainly in C/C++, for Windows. I have been gradually moving their legacy C code over to use C++ (with STL, MFC, ATL, and WTL). I have pulled in other technologies (Java, C#, VB, COM, SOAP) where appropriate, especially when integrating with third-party products.

In addition to that, I have overseen the technical side of the company website (ASP, VBScript, JavaScript, HTML, CSS), and have also worked closely with colleagues working on other products (Web-based, C#, ASP.NET, SQL, etc).

For developing, I mainly use Visual Studio 2010, along with an in-house-designed editor based on Andrei Stcherbatchenko's syntax parsing classes, and various (mostly freeware) tools. For website design, I use Dreaweaver CS3.

When not developing software, I enjoy listening to and playing music, playing electric and acoustic guitars and mandolin.

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