Introduction

CCustomBitmapButton is MFC control derived from the CWnd class. The button has two parts: a background and a foreground. If the operating system is WinXP and XP Themes are enabled the background is a bitmap loaded from the current active theme resource file (I use similar technique to draw the scroll buttons in the CCustomTabCtrl control); otherwise, the "DrawFrameControl" function is used to draw the button background. The foreground is a user-defined monochrome bitmap (glyph) drawn transparently on the button background.

Supported features:

• Standard or XP Themes view
• 12 predefined background styles
• User-defined foregrounds (bitmap glyphs)
• Button states supported: "NORMAL","HOT","PRESSED", and "DISABLED"
• Buttons can be created in the caption bar area
• Dialog, SDI and MDI support for the caption buttons
• Ficker-free drawing
• Built-in tooltips

Using the Code

To integrate the CCustomBitmapButton class into your application as a caption frame, please follow the steps below:

1. Add ThemeUtil.h, ThemeUtil.cpp, CustomBitmapButton.h, CustomBitmapButton.cpp, Tmschema.h, and Schemadef.h to your project.
2. Include CustomBitmapButton.h to the appropriate header file—usually the dialog class header where the CCustomBitmapButton class is used.

   //  CustomBitmapButtonDemoDlg.h : header file
      #include "CustomBitmapButton.h"
   

3. Declare m_ctrlCaptionFrame object of type CCustomBitmapButton in your dialog header.

   //  CustomBitmapButtonDemoDlg.h : header file
      class CCustomBitmapButtonDemoDlg : CDialog
      {
         ......
      private:
         CCustomBitmapButton m_ctrlCaptionFrame;
      };
   

4. Create the caption frame.

   In your dialog's OnInitDialog, add the following code:

   //  CustomBitmapButtonDemoDlg.cpp : definition file
      m_ctrlCaptionFrame.CreateCaptionFrame(this,IDR_MAINFRAME);
   

5. After creating the caption frame, add as many buttons as you need.

To add caption buttons, call AddCaptionButton in your dialog's OnInitDialog:

//  CustomCaptionButtonDemoDlg.cpp : definition file
   m_ctrlCaptionFrame.AddCaptionButton(CRect(0,0,0,0),1,
      CBNBKGNDSTYLE_CLOSE, FALSE);
   m_ctrlCaptionFrame.AddCaptionButton(CRect(0,0,150,0),2,
      CBNBKGNDSTYLE_CAPTION, TRUE);
   CCustomBitmapButton* pBn1 =
      m_ctrlCaptionFrame.GetCaptionButtonPtr(1);
   if(pBn1)
   {
      CBitmap bmpGlyph1;
      bmpGlyph1.LoadBitmap(IDB_GLYPH1);
      pBn1->SetGlyphBitmap(bmpGlyph1);
      pBn1->SetTooltipText(_T("Double click to close the
                               window, Right click to
                               display the popup menu"));
   }
   CCustomBitmapButton* pBn2 =
      m_ctrlCaptionFrame.GetCaptionButtonPtr(2);
   if(pBn2)
   {
      CBitmap bmpGlyph2;
      bmpGlyph2.LoadBitmap(IDB_GLYPH2);
      pBn2->SetGlyphBitmap(bmpGlyph2);
      pBn2->SetTooltipText(_T("Articles by Andrzej
                               Markowski"));
   }

6. Process WM_NOTIFY messages from the caption buttons in your dialog class. As users click a button, the button sends notification messages (NM_CLICK, NM_RCLICK, NM_DBLCLK, and NM_RDBLCLK) to its parent window. Handle these messages if you want to do something in response.

   //  CustomBitmapButtonDemoDlg.cpp : definition file
      BEGIN_MESSAGE_MAP(CCustomBitmapButtonDemoDlg, CDialog)
      //{{AFX_MSG_MAP(CCustomBitmapButtonDemoDlg)
      ON_NOTIFY(NM_DBLCLK, 1, OnBnDblClickedCaptionbn1)
      ON_NOTIFY(NM_RCLICK, 1, OnBnRClickedCaptionbn1)
      ON_NOTIFY(NM_CLICK,  2, OnBnClickedCaptionbn2)
      //}}AFX_MSG_MAP
      END_MESSAGE_MAP()
      ....
      void CCustomBitmapButtonDemoDlg::
         OnBnDblClickedCaptionbn1(NMHDR * pNotifyStruct,
                                  LRESULT * result)
      {
         CPoint pt;
         ::GetCursorPos(&pt);
         PostMessage(WM_SYSCOMMAND,SC_CLOSE,MAKEWORD(pt.x,pt.y));
      }
      ....
   

7. Don't forget to destroy the caption frame; otherwise, you will have memory leaks.

   //  CustomBitmapButtonDemoDlg.cpp : definition file
   
      void CCustomBitmapButtonDemoDlg::OnDestroy() 
      {
         m_ctrlCaptionFrame.DestroyCaptionFrame();
         CDialog::OnDestroy();
      }
   

CCustomBitmapButton Class Members

Construction/Destruction
Attributes
Operations
Notification Messages
Error Codes

Construction/Destruction

Attributes

Operations

CCustomBitmapButton::CCustomBitmapButton

CCustomBitmapButton( );

Remarks

Call this function to construct a CCustomBitmapButton object.

CCustomBitmapButton::Create

BOOL Create( DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID );

Return Value

TRUE if initialization of the object was successful; otherwise, FALSE.

Parameters

dwStyle—Specifies the button style.

rect—Specifies the button size and position. It can be either a CRect object or a RECT structure.

pParentWnd—Specifies the button parent window.

nID—Specifies the button ID.

Remarks

Creates a bitmap button and attaches it to an instance of a CCustomBitmapButton object.

CCustomBitmapButton::CreateCaptionFrame

int CreateCaptionFrame( CWnd* pCaptionWnd, int nIDIcon );

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

pCaptionWnd—Specifies the caption bar owner window.

nIDIcon—Specifies the caption icon resource id.

Remarks

Creates a caption frame.

CCustomBitmapButton::DestroyCaptionFrame

int DestroyCaptionFrame();

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Remarks

Destroys a caption frame.

CCustomBitmapButton::GetCaptionButtonPtr

CCustomBitmapButton* GetCaptionButtonPtr( int nButtonID ) const;

Return Value

Pointer to the CCustomBitmapButton object if successful; otherwise, NULL.

Parameters

nButtonID—The ID of the caption button.

Remarks

Call this function to retrieve the pointer to the caption button.

CCustomBitmapButton::SetTooltipText

int SetTooltipText( CString sText );

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

sText—Pointer to a string object that contains the new tooltip text.

Remarks

This function changes the tooltip text of a button.

CCustomBitmapButton::GetBkStyle

int GetBkStyle();

Return Value

Returns the button background style for this CCustomBitmapButton object.

Remarks

Call this function to retrieve information about the button control background style.

CCustomBitmapButton::SetBkStyle

int SetBkStyle( int nBkStyle );

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

nBkStyle—Specifies the button background style.

Supported background styles:

• CBNBKGNDSTYLE_CAPTION—frame buttons
• CBNBKGNDSTYLE_CLOSE
• CBNBKGNDSTYLE_MDI
• CBNBKGNDSTYLE_COMBO—combobox dropdown button
• CBNBKGNDSTYLE_SPINUP—spin buttons
• CBNBKGNDSTYLE_SPINDN
• CBNBKGNDSTYLE_SPINUPHOR
• CBNBKGNDSTYLE_SPINDNHOR
• CBNBKGNDSTYLE_SCROLLUP—scrollbar buttons
• CBNBKGNDSTYLE_SCROLLDOWN
• CBNBKGNDSTYLE_SCROLLLEFT
• CBNBKGNDSTYLE_SCROLLRIGHT

Remarks

Changes the background style of a button.

CCustomBitmapButton::GetGlyphBitmap

HBITMAP GetGlyphBitmap();

Return Value

A handle to a bitmap. NULL if no bitmap is previously specified.

Remarks

Call this member function to get the handle of a glyph bitmap that is associated with a button.

CCustomBitmapButton::SetGlyphBitmap

int SetGlyphBitmap( HBITMAP hBmpGlyph );

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

hBmpGlyph—The handle of a bitmap.

Remarks

Call this member function to associate a new glyph bitmap with the button.

CCustomBitmapButton::EnableWindow

int EnableWindow( BOOL bEnable = TRUE);

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

bEnable—Specifies whether the given window is to be enabled or disabled. If this parameter is TRUE, the window will be enabled. If this parameter is FALSE, the window will be disabled.

Remarks

Call this function to enable or disable a button control.

CCustomBitmapButton::AddCaptionButton

int AddCaptionButton( LPCRECT lpRect, UINT nID, int nBkStyle, BOOL fUserDefWidth );

Return Value

CBNERRR_NOERROR if successful; otherwise, CBNERRR_ERRORCODE.

Parameters

lpRect—Specifies the button width if fUserDefWidth is true; otherwise, ignored.

nID—Specifies the button ID.

nBkStyle—Specifies the button background style.

fUserDefWidth—If TRUE—user defined button width.

Remarks

Call this function to insert a new button in an existing caption bar.

Notification Messages

The following notification codes are supported by the button control:

• NM_CLICK—User clicked left mouse button in the control.
• NM_RCLICK—User clicked right mouse button in the control.
• NM_DBLCLK—User double clicked left mouse button in the control.
• NM_RDBLCLK—User double clicked right mouse button in the control.

Error Codes

The following errors can be returned by the button control functions:

• CBNERRR_NOERROR—Operation succesful.
• CBNERR_OUTOFMEMORY—Function call failed because there was not enough memory available.
• CBNERR_INCORRECTPARAMETER—Function call failed because an incorrect function parameter was specified.
• CBNERR_INCORRECTBUTTONSTYLE—Function call failed because an incorrect button style was specified.
• CBNERR_INCORRECTFRAMESTYLE—Function call failed because the WS_CAPTION style was not specified.
• CBNERR_INCORRECTFUNCCALL—Incorrect function call (for example: ob.SetTooltipText(...) where ob is an instance of the caption frame object).
• CBNERR_CREATEBUTTONFAILED—Function call failed because creation of the button control failed.
• CBNERR_CREATETOOLTIPCTRLFAILED—Function call failed because creation of the tooltip control failed.
• CBNERR_COPYIMAGEFAILED—Function call failed because copying of the glyph image failed.
• CBNERR_SETWINDOWLONGFAILED—Call to the function "SetWindowLong" failed.
• CBNERR_FRAMEALREADYCREATED—Function call failed because the caption frame was already created.
• CBNERR_FRAMENOTCREATED—Function call failed because the caption frame was not created.