Using Rebar Controls

Using Rebar Controls

This section contains example code showing how to implement rebar controls.

Creating a Rebar Control

Creating a Rebar Control

An application creates a rebar control by calling the CreateWindowEx function, specifying REBARCLASSNAME as the window class. The application must first register the window class by calling the InitCommonControlsEx function, specifying the ICC_COOL_CLASSES bit in the accompanying INITCOMMONCONTROLSEX structure.

The following sample creates a rebar control with two bands—one that contains a combo box and another that contains a toolbar. (See the illustration at Rebar Controls.) These controls are created separately and passed to the example function as parameters.

HWND WINAPI CreateRebar(HWND hwndOwner, HWND hwndToolbar, HWND hwndCombo)
{
    // Check parameters.
    if ((hwndToolbar == NULL) || (hwndCombo == NULL))
    {
        return NULL;
    }

    // Initialize common controls.
    INITCOMMONCONTROLSEX icex;
    icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
    icex.dwICC   = ICC_COOL_CLASSES | ICC_BAR_CLASSES;
    InitCommonControlsEx(&icex);

    // Create the rebar.
    HWND hwndRebar = CreateWindowEx(WS_EX_TOOLWINDOW,
        REBARCLASSNAME,
        NULL,
        WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS |
        WS_CLIPCHILDREN | RBS_VARHEIGHT |
        CCS_NODIVIDER | RBS_BANDBORDERS,
        0,0,0,0,
        hwndOwner,
        NULL,
        g_hInst,
        NULL);

    if(!hwndRebar)
    {
        return NULL;
    }

    // Initialize band info used by both bands.
    REBARBANDINFO rbBand = { sizeof(REBARBANDINFO) };
    rbBand.fMask  = 
          RBBIM_STYLE       // fStyle is valid.
        | RBBIM_TEXT        // lpText is valid.
        | RBBIM_CHILD       // hwndChild is valid.
        | RBBIM_CHILDSIZE   // child size members are valid.
        | RBBIM_SIZE;       // cx is valid
    rbBand.fStyle = RBBS_CHILDEDGE | RBBS_GRIPPERALWAYS;  //RBBS_FIXEDSIZE | 

    // Get the height of the toolbar.
    DWORD dwBtnSize = (DWORD)SendMessage(hwndToolbar, TB_GETBUTTONSIZE, 0,0);

    // Set values unique to the band with the toolbar.
    rbBand.lpText = TEXT("");
    rbBand.hwndChild = hwndToolbar;
    rbBand.cyChild = LOWORD(dwBtnSize);
    rbBand.cxMinChild = NUMBUTTONS * HIWORD(dwBtnSize);
    rbBand.cyMinChild = LOWORD(dwBtnSize);
    // The default width is the width of the buttons.
    rbBand.cx = 0;

    // Add the band that has the toolbar.
    SendMessage(hwndRebar, RB_INSERTBAND, (WPARAM)-1, (LPARAM)&rbBand);

    // Set values unique to the band with the combo box.
    RECT rc;
    GetWindowRect(hwndCombo, &rc);
    rbBand.lpText = TEXT("Font");
    rbBand.hwndChild = hwndCombo;
    rbBand.cxMinChild = 0;
    rbBand.cyMinChild = rc.bottom - rc.top;
    // The default width should be set to some value wider than the text. The combo 
    // box itself will expand to fill the band.
    rbBand.cx = 100;

    // Add the band that has the combo box.
    SendMessage(hwndRebar, RB_INSERTBAND, (WPARAM)-1, (LPARAM)&rbBand);
    
    return (hwndRebar);
}