A cool bitmap slider like Media Player's...

• Download source files - 8.08 Kb
• Download demo project - 137 Kb

Introduction

Do you like the cool slider in Windows Media Player 9.0? Yes!!

Let's build it, following this article.

Used custom classes

• CBitItem

  Inherits none. Manages bitmap resources, one or more bitmaps.

• CBitWnd

  Inherits CWnd. Manages owner draw bitmap window.

• CBitSlider

  Inherits CSliderCtrl. Manages owner draw bitmap slider.

By the way:

CBitItem and CBitWnd are common tool classes for any place where you want to make bitmap owner draw window...

Sample demo code

Step 1: Get the hand cursor from OS

HCURSOR    CCoolSliderDlg::GetSysHandCursor()
{
    TCHAR        strWinDir[MAX_PATH] = {0};
    HCURSOR        hHandCursor    = NULL;
    hHandCursor = ::LoadCursor(NULL, MAKEINTRESOURCE(32649));
    
    // Still no cursor handle - load the WinHelp hand cursor

    if( hHandCursor == NULL )
    {
        GetWindowsDirectory(strWinDir, MAX_PATH);
        strcat(strWinDir, _T("\\winhlp32.exe"));
        
        // This retrieves cursor #106 from winhlp32.exe,

        // which is a hand pointer

        HMODULE hModule = ::LoadLibrary(strWinDir);
        DWORD    dwErr = GetLastError();
        if( hModule != NULL )
        {
            HCURSOR     hTempCur = ::LoadCursor(hModule, MAKEINTRESOURCE(106));
            hHandCursor = (hTempCur != NULL) ? CopyCursor(hTempCur) : NULL;
            FreeLibrary(hModule);
        }
    }
    return hHandCursor;
}

Step 2: Build a cool-slider using exclusive bitmap resource

void CCoolSliderDlg::BuildCoolSlider()
{
    m_hHandCur = this->GetSysHandCursor();
    ASSERT( m_hHandCur != NULL );
    
    m_ctlSlider.SetFlipCursor(m_hHandCur);
    m_ctlSlider.BuildThumbItem(IDB_BITMAP_THUMB, 6, 12);
    m_ctlSlider.BuildBackItem(IDB_BITMAP_NORMAL, IDB_BITMAP_ACTIVE);
    m_ctlSlider.SetTopOffset(3);
    m_ctlSlider.SetRange(0, 100);
    m_ctlSlider.SetLineSize(0);
    m_ctlSlider.SetPos(20);
}

Step 3: Build some cool-sliders using shared bitmap resource (3 sliders use the same bitmap resource)

void CCoolSliderDlg::BuildShareSlider()
{
    ASSERT( m_hHandCur != NULL );

    ASSERT( m_lpActive == NULL );
    ASSERT( m_lpNormal == NULL );
    ASSERT( m_lpThumb == NULL );

    m_lpActive = new CBitItem(IDB_BITMAP_ACTIVE, 0, 0);
    m_lpNormal = new CBitItem(IDB_BITMAP_NORMAL, 0, 0);
    m_lpThumb  = new CBitItem(IDB_BITMAP_THUMB, 6, 12);

    m_ctlShare1.SetFlipCursor(m_hHandCur);
    m_ctlShare1.BuildThumbItem(m_lpThumb);
    m_ctlShare1.BuildBackItem(m_lpNormal, m_lpActive);
    m_ctlShare1.SetTopOffset(3);
    m_ctlShare1.SetRange(0, 100);
    m_ctlShare1.SetLineSize(0);
    m_ctlShare1.SetPos(40);

    m_ctlShare2.SetFlipCursor(m_hHandCur);
    m_ctlShare2.BuildThumbItem(m_lpThumb);
    m_ctlShare2.BuildBackItem(m_lpNormal, m_lpActive);
    m_ctlShare2.SetTopOffset(3);
    m_ctlShare2.SetRange(0, 100);
    m_ctlShare2.SetLineSize(0);
    m_ctlShare2.SetPos(60);

    m_ctlShare3.SetFlipCursor(m_hHandCur);
    m_ctlShare3.BuildThumbItem(m_lpThumb);
    m_ctlShare3.BuildBackItem(m_lpNormal, m_lpActive);
    m_ctlShare3.SetTopOffset(3);
    m_ctlShare3.SetRange(0, 100);
    m_ctlShare3.SetLineSize(0);
    m_ctlShare3.SetPos(80);
}

Step 4: Erase the dialog background using slider bitmap's back-color

BOOL CCoolSliderDlg::OnEraseBkgnd(CDC* pDC) 
{
    CRect    rcRect;
    this->GetClientRect(rcRect);
    
    pDC->FillSolidRect(rcRect, RGB(96, 123, 189));

    return TRUE;
}

Step 5: Release all the allocated resources when program exits

CCoolSliderDlg::~CCoolSliderDlg()
{
    if( m_lpNormal != NULL )
    {
        delete m_lpNormal;
        m_lpNormal = NULL;
    }
    if( m_lpActive != NULL )
    {
        delete m_lpActive;
        m_lpActive = NULL;
    }
    if( m_lpThumb != NULL )
    {
        delete m_lpThumb;
        m_lpThumb = NULL;
    }
}

Want to know more detail? Please see the demo project!!

Bug report or comments, please contact me: Jackey.

Enjoy it!!

History

• 07/24/2004

  First version... (Only supports horizontal slider:))

• 07/25/2004

  Added vertical slider support, thanks for PJ Arends.

• To be continued...