Custom buttons in CFrameWnd caption?

Does anyone know how I can draw my own buttons in a FrameWnd caption?  Maybe the answer lies in ::DrawCaption()?   But if so, I can't get it to work.
LVL 7
Bill NolanOwner, Lead Technology ProgrammerAsked:
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JunHaanCommented:
Slimfinger,

To have a button in the title bar, you'd need to create a 'pseudo' button. We would have to process the mouse messages and draw the button ourselves...

First of all, since we're drawing our own button, we'd need two bitmaps... One for the button-up state amd the other for the button-down state. Give the bitmaps a dimension of 16x16(I assume you're app is a regular window, not a tool window). I'll use IDB_BUTTONUP and IDB_BUTTONDOWN for this example.

First, declare a few variables in your header file, as public :

//Start of code

class CYourDlg : public CDialog
{
// Construction
public:
 CYourDlg(CWnd* pParent = NULL); // standard constructor

 //Add these
 void DrawCapButton();
 void GetButtonRect( CRect &rect );    

 bool m_bPressed;
 CBitmap m_bitmapPressed;
 CBitmap m_bitmapUnpressed;

}    

//End of code

In the constructor of your dialog class, load the two bitmaps :

//Start of code

CYourDlg::CYourDlg(CWnd *pParent ) : CDialog( CYourDlg::IDD, pParent )
{
 //{{AFX_DATA_INIT(CYourDlg)
 //}}AFX_DATA_INIT
 //Add these
 m_bPressed = FALSE;
 m_bitmapPressed.LoadBitmap( IDB_BUTTONDOWN );
 m_bitmapUnpressed.LoadBitmap( IDB_BUTTONUP );

}    

//End of code

Then, using the ClassWizard, add the WM_NCPAINT and the WM_ACTIVATE message handlers to your class. Modify them and
add the DrawCapButton and GetButtonRect functions as well :

//Start of code
void CYourDlg::OnNcPaint()
{
 //Add this
 DrawCapButton();
}

void CYourDlg::OnActivate( UINT nState, CWnd* pWndOther, BOOL bMinimized )
{
 //Add this
 DrawCapButton();
}    


void CYourDlg::DrawCapButton()
{

 //Skip if window is not visible or minimized
 if( !IsWindowVisible() || IsIconic() ) return;

 //Get the bitmap
 CDC memDC;
 CDC* pDC = GetWindowDC();
 memDC.CreateCompatibleDC( pDC );
 memDC.SelectObject( m_bPressed ? &m_bitmapPressed : &m_bitmapUnpressed );

 //Convert button rect into non-client area coordinates
 CRect rect, rectWnd;
 GetButtonRect(rect);
 GetWindowRect(rectWnd);
 rect.OffsetRect( -rectWnd.left, -rectWnd.top );

 //Draw
 pDC->StretchBlt( rect.left, rect.top, rect.Width(),
              rect.Height(). &memDC, 0, 0, 16, 16, SRCCOPY );

 //Clean up
 memDC.DeleteDC();
 ReleaseDC( pDC );
}

void CWinsysDlg::GetButtonRect(CRect& rect)
{
GetWindowRect(&rect);

rect.top += GetSystemMetrics(SM_CYFRAME)+1;
rect.bottom = rect.top + GetSystemMetrics(SM_CYSIZE)-4;
            rect.left = rect.right - GetSystemMetrics(SM_CXFRAME) - ( 4 * GetSystemMetrics(SM_CXSIZE))-1;
            //Replace 4 with the current number of buttons in your caption + 1

rect.right = rect.left + GetSystemMetrics(SM_CXSIZE)-3;
}

Okay, now you'd want to activate your button :

//Start of Code
//In .h file

// Generated message map functions
//{{AFX_MSG(CYourDlg)
afx_msg void OnNcLButtonDown( UINT nHitTest, CPoint point ); //Add this
//}}AFX_MSG
DECLARE_MESSAGE_MAP()

//In .cpp file
//Add to message map

BEGIN_MESSAGE_MAP(CYourDlg, CDialog)
//{{AFX_MSG_MAP(CYourDlg)
ON_WM_NCLBUTTONDOWN()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CWinsysDlg::OnNcLButtonDown(UINT nHitTest, CPoint point)
{
if( nHitTest == HTCAPTION )
{

//see if in button area
CRect rect;
GetButtonRect( rect );
if( rect.PtInRect( point ) )
{
m_bPressed = !m_bPressed;
DrawCapButton();
}
}
CDialog::OnNcLButtonDown( nHitTest, point);
}

//End of Code
Phew! Hope this answers your question! :)

0
 
migelCommented:
Hi!
look at www.codeguru.com
here is example how to draw custom window caption
0
 
Bill NolanOwner, Lead Technology ProgrammerAuthor Commented:
*Where?* This seems to be a local favorite here.  Several times I've been referred to codeguru.com, yet given absolutely no idea on how to find the article in question,  just "here is an example". In this case, there is nothing in their cute database that comes up under anything related to this topic.  And I can't find anything in the highlighted sections, either.
0
 
migelCommented:
also look at dialog section (same site) there is article about adding controls to the dialog caption/ The technique is the same for any non dialog window.
0
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