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Triangular Button

Posted by Janus Kjempff on November 24th, 1998
Tried out the CRoundButton class by Chris Maunder, and got inspired to make a Triangle Button instead (actually i copy/pasted the code structure from that) - Anyway it might be useful to someone, so here it is.

A class derived from CButton, that displays the button as a triangle pointing in one of four directions (LEFT, RIGHT, UP, DOWN) (see demo).

Download source 31KB

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Comments

  • Resourece Leak at DeleteObject in PreSubClassWindow

    Posted by Legacy on 12/20/2002 12:00am

    Originally posted by: Jibesh 

    It was great work 

    You got appreciation 

    Very nice Buttons ...

    if(CurrentRegion.Detach()!=NULL) // Line 102

     CurrentRegion.DeleteObject() 

     // Check the Handle Value before deleting it

     // or It will produce a resource leak

     // I got this leak when i debug using Bounds checker in windows 2000

    Reply

  • resource leak

    Posted by Legacy on 07/26/1999 12:00am

    Originally posted by: Peggy Van Lierde

    Hi,

    First of all, I love the control. It really adds something more
    to the interface than just the common rectangular button,
    or even the bitmapbutton.

    When checking my project with boundschecker, I discovered
    a resource-leak for each csxbutton I created.
    Has anyone else noticed this too, or did I forget something ?

    I added here the message which boundschecker reported:
    Resource leak: allocated by CopyImage in Sxbutton.cpp (116), HANDLE: 0x7B050D58

    Following, I copy-pasted the method in which boundschecker detects this resource leak :

    BOOL CSXButton::SetBitmapCommon( UINT nID, int nWidth, int nHeight, COLORREF crTransparentMask, BOOL bUseMask )
    {
    if (m_hBitmapDisabled != 0)
    DeleteObject( m_hBitmapDisabled);
    if ( m_hBitmap )
    DeleteObject( m_hBitmap );

    // GS980730 added AfxFindResourceHandle to make MFC find resources in DLLs too...
    HINSTANCE hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nID),
    RT_BITMAP);

    // If it is not a masked bitmap, just go through the
    // motions as if it was, but set then number of color mappings to 0

    COLORMAP mapColor;
    mapColor.from = crTransparentMask;
    mapColor.to = ::GetSysColor( COLOR_BTNFACE );
    HBITMAP bmTemp = (HBITMAP)::CreateMappedBitmap(hInstResource, nID, IMAGE_BITMAP, &mapColor;, bUseMask ? 1 : 0 );

    //Resource leak is in following line
    m_hBitmap = (HBITMAP)::CopyImage( bmTemp, IMAGE_BITMAP, nWidth, nHeight, LR_COPYDELETEORG );

    // Create disabled bitmap. We need to make the masked area white so
    // it will appear transparent when the bitmap is rendered as an
    // 'embossed' (disabled) image in DrawItem() below. Since DrawState
    // converts the image to monochrome, white is transparent, black is
    // graphics data.
    mapColor.to = RGB( 255, 255, 255 );
    bmTemp = (HBITMAP)::CreateMappedBitmap(hInstResource, nID, IMAGE_BITMAP, &mapColor;, bUseMask ? 1 : 0 );
    m_hBitmapDisabled = (HBITMAP)::CopyImage( bmTemp, IMAGE_BITMAP, nWidth, nHeight, LR_COPYDELETEORG );

    if( m_hBitmap == 0 || m_hBitmapDisabled == 0 )
    return FALSE;

    m_nImageWidth = nWidth;
    m_nImageHeight = nHeight;

    m_hIcon = 0;

    Redraw();

    return TRUE;
    }

    Regards,
    Peggy Van Lierde.

    Reply

  • TriangleButton works right out of the box!

    Posted by Legacy on 06/17/1999 12:00am

    Originally posted by: G Larkin

    Downloaded the code, and it worked the first try when I incorporated it into my code where I needed triangular buttons. Commented out the focus code in the DrawItem function, as it was leaving some 'droppings'.

    Reply

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