CMFCColorMenuButton Class

Artikel
11/16/2012

The CMFCColorMenuButton class supports a menu command or a toolbar button that starts a color picker dialog box.

class CMFCColorMenuButton : public CMFCToolBarMenuButton

Members

Public Constructors

Name	Description
CMFCColorMenuButton::CMFCColorMenuButton	Constructs a CMFCColorMenuButton object.

Public Methods

Name	Description
CMFCColorMenuButton::EnableAutomaticButton	Enables and disables an "automatic" button that is positioned above the regular color buttons. (The standard system automatic button is labeled Automatic.)
CMFCColorMenuButton::EnableDocumentColors	Enables the display of document-specific colors instead of system colors.
CMFCColorMenuButton::EnableOtherButton	Enables and disables an "other" button that is positioned below the regular color buttons. (The standard system "other" button is labeled More Colors….)
CMFCColorMenuButton::EnableTearOff	Enables the ability to tear off a color pane.
CMFCColorMenuButton::GetAutomaticColor	Retrieves the current automatic color.
CMFCColorMenuButton::GetColor	Retrieves the current button's color.
CMFCColorMenuButton::GetColorByCmdID	Retrieves the color that corresponds to a specified command ID.
CMFCColorMenuButton::OnChangeParentWnd	Called by the framework when the parent window changes.
CMFCColorMenuButton::OpenColorDialog	Opens a color selection dialog box.
CMFCColorMenuButton::SetColor	Sets the color of the current color button.
CMFCColorMenuButton::SetColorByCmdID	Sets the color of the specified color menu button.
CMFCColorMenuButton::SetColorName	Sets a new name for the specified color.
CMFCColorMenuButton::SetColumnsNumber	Sets the number of columns that are displayed by a CMFCColorBar object.

Protected Methods

Name	Description
CMFCColorMenuButton::CopyFrom	Copies another toolbar button to the current button.
CMFCColorMenuButton::CreatePopupMenu	Creates a color picker dialog box.
CMFCColorMenuButton::IsEmptyMenuAllowed	Indicates whether empty menus are supported.
CMFCColorMenuButton::OnDraw	Called by the framework to display an image on a button.
CMFCColorMenuButton::OnDrawOnCustomizeList	Called by the framework before a CMFCColorMenuButton object is displayed in the list of a toolbar customization dialog box.

Remarks

To replace the original menu command or toolbar button with a CMFCColorMenuButton object, create the CMFCColorMenuButton object, set any appropriate CMFCColorBar Class styles, and then call the ReplaceButton method of the CMFCToolBar Class class. If you customize a toolbar, call the CMFCToolBarsCustomizeDialog::ReplaceButton method.

The color picker dialog box is created during the processing of the CMFCColorMenuButton::CreatePopupMenu event handler. The event handler notifies the parent frame with a WM_COMMAND message. The CMFCColorMenuButton object sends the control ID that is assigned to the original menu command or toolbar button.

Example

The following example demonstrates how to create and configure a color menu button by using various methods in the CMFCColorMenuButton class. In the example, a CPalette object is first created and then used to construct an object of the CMFCColorMenuButton class. The CMFCColorMenuButton object is then configured by enabling its automatic and other buttons, and setting its color and the number of columns. This code is part of the WordPad Sample: MFC WordPad Application.

    CPalette    m_palColorPicker;   // Palette for color picker
    int         m_nNumColours;


...


CMFCColorMenuButton* CFormatBar::CreateColorButton ()
{
    if (m_palColorPicker.GetSafeHandle () == NULL)
    {
        m_nNumColours = sizeof (crColours)/sizeof(ColourTableEntry);
        ASSERT(m_nNumColours <= MAX_COLOURS);
        if (m_nNumColours > MAX_COLOURS)
            m_nNumColours = MAX_COLOURS;

        // Create the palette
        struct 
        {
            LOGPALETTE    LogPalette;
            PALETTEENTRY  PalEntry[MAX_COLOURS];
        }pal;

        LOGPALETTE* pLogPalette = (LOGPALETTE*) &pal;
        pLogPalette->palVersion    = 0x300;
        pLogPalette->palNumEntries = (WORD) m_nNumColours; 

        for (int i = 0; i < m_nNumColours; i+)
        {
            pLogPalette->palPalEntry[i].peRed   = GetRValue(crColours[i].crColour);
            pLogPalette->palPalEntry[i].peGreen = GetGValue(crColours[i].crColour);
            pLogPalette->palPalEntry[i].peBlue  = GetBValue(crColours[i].crColour);
            pLogPalette->palPalEntry[i].peFlags = 0;
        }

        m_palColorPicker.CreatePalette (pLogPalette);
    }


    CMFCColorMenuButton* pColorButton = new 
        CMFCColorMenuButton (ID_CHAR_COLOR, _T("Text Color..."), &m_palColorPicker);

    pColorButton->EnableAutomaticButton (_T("Automatic"), RGB (0, 0, 0));
    pColorButton->EnableOtherButton (_T("More Colors..."));
    pColorButton->EnableDocumentColors (_T("Document's Colors"));
    pColorButton->EnableTearOff (ID_COLOR_TEAROFF, 5, 2);
    pColorButton->SetColumnsNumber (8);
    pColorButton->SetColor(RGB(0,0,255));

    // Initialize color names:
    for (int i = 0; i < m_nNumColours; i+)
    {
        CMFCColorMenuButton::SetColorName (crColours[i].crColour, crColours[i].szName);
    }

    return pColorButton;
}