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CMFCToolBarFontComboBox Class

  • Artikkeli

A toolbar button that contains a combo box control that enables the user to select a font from a list of system fonts.

Syntax

class CMFCToolBarFontComboBox : public CMFCToolBarComboBoxButton

Members

Protected Constructors

Name Description
CMFCToolBarFontComboBox::CMFCToolBarFontComboBox Constructs a CMFCToolBarFontComboBox object.

Public Methods

Name Description
CMFCToolBarFontComboBox::GetFontDesc Returns a pointer to the CMFCFontInfo object for a specified index in the combo box.
CMFCToolBarFontComboBox::SetFont Selects a font in the font combo box according to either the name of the font, or the prefix and character set of the font.

Data Members

CMFCToolBarFontComboBox::m_nFontHeight
The height of the characters in the font combo box.

Remarks

To add a font combo box button to a toolbar, follow these steps:

  1. Reserve a dummy resource ID for the button in the parent toolbar resource.

  2. Construct a CMFCToolBarFontComboBox object.

  3. In the message handler that processes the AFX_WM_RESETTOOLBAR message, replace the original button with the new combo box button by using CMFCToolBar::ReplaceButton.

  4. Synchronize the font that is selected in the combo box with the font in the document by using the CMFCToolBarFontComboBox::SetFont method.

To synchronize the document's font with the font selected in the combo box, use the CMFCToolBarFontComboBox::GetFontDesc method to retrieve the attributes of the selected font, and use those attributes to create a CFont Class object.

The font combo box button calls the Win32 function EnumFontFamiliesEx to determine the screen and printer fonts available to the system.

Inheritance Hierarchy

CObject

CMFCToolBarButton

CMFCToolBarComboBoxButton

CMFCToolBarFontComboBox

Requirements

Header: afxtoolbarfontcombobox.h

CMFCToolBarFontComboBox::CMFCToolBarFontComboBox

Constructs a CMFCToolBarFontComboBox object.

public:
CMFCToolBarFontComboBox(
    UINT uiID,
    int iImage,
    int nFontType = DEVICE_FONTTYPE | RASTER_FONTTYPE | TRUETYPE_FONTTYPE,
    BYTE nCharSet = DEFAULT_CHARSET,
    DWORD dwStyle = CBS_DROPDOWN,
    int iWidth = 0,
    BYTE nPitchAndFamily = DEFAULT_PITCH);

protected:
CMFCToolBarFontComboBox(
    CObList* pLstFontsExternal,
    int nFontType,
    BYTE nCharSet,
    BYTE nPitchAndFamily);

CMFCToolBarFontComboBox();

Parameters

uiID
[in] The command ID of the combo box.

iImage
[in] The zero-based index of a toolbar image. The image is located in the CMFCToolBarImages Class object that CMFCToolBar Class class maintains.

nFontType
[in] The types of fonts that the combo box contains. This parameter can be a combination (boolean OR) of the following values:

DEVICE_FONTTYPE

RASTER_FONTTYPE

TRUETYPE_FONTTYPE

nCharSet
[in] If set to DEFAULT_CHARSET, the combo box contains all uniquely-named fonts in all character sets. (If there are two fonts with the same name, the combo box contains one of them.) If set to a valid character set value, the combo box contains only fonts in the specified character set. See LOGFONT for a listing of possible character sets.

dwStyle
[in] The style of the combo box. (see Combo-Box Styles)

iWidth
[in] The width in pixels of the edit control.

nPitchAndFamily
[in] If set to DEFAULT_PITCH, the combo box contains fonts regardless of pitch. If set to FIXED_PITCH or VARIABLE_PITCH, the combo box contains only fonts with that pitch type. Filtering based on font family is not currently supported.

pLstFontsExternal
[out] Pointer to a CObList Class object that stores the available fonts.

Remarks

Usually, CMFCToolBarFontComboBox objects store the list of available fonts in a single shared CObList object. If you use the second overload of the constructor and provide a valid pointer to pLstFontsExternal, that CMFCToolBarFontComboBox object will instead fill the CObList that pLstFontsExternal points to with available fonts.

Example

The following example demonstrates how to construct a CMFCToolBarFontComboBox object. This code snippet is part of the Word Pad sample.

CMFCToolBarFontComboBox *CFormatBar::CreateFontComboButton()
{
   // CSize m_szBaseUnits
   return new CMFCToolBarFontComboBox(IDC_FONTNAME,
                                      GetCmdMgr()->GetCmdImage(IDC_FONTNAME, FALSE),
                                      TRUETYPE_FONTTYPE | DEVICE_FONTTYPE,
                                      DEFAULT_CHARSET,
                                      WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | CBS_DROPDOWN |
                                          CBS_AUTOHSCROLL | CBS_HASSTRINGS | CBS_OWNERDRAWFIXED,
                                      (3 * LF_FACESIZE * m_szBaseUnits.cx) / 2);
}

CMFCToolBarFontComboBox::GetFontDesc

Returns a pointer to the CMFCFontInfo object for a specified index in the combo box.

const CMFCFontInfo* GetFontDesc(int iIndex=-1) const;

Parameters

iIndex
[in] Specifies the zero-based index of a combo box item.

Return Value

A pointer to a CMFCFontInfo object. If iIndex does not specify a valid item index, the return value is NULL.

CMFCToolBarFontComboBox::m_nFontHeight

Specifies the height, in pixels, of characters in the font combo box if the combo box has owner draw style.

static int m_nFontHeight

Remarks

If the m_nFontHeight variable is 0, the height is calculated automatically according to the default font of the combo box. The height includes both the ascent of characters above the baseline and the descent of characters underneath the baseline.

CMFCToolBarFontComboBox::SetFont

Selects the font in the font combo box according to the font name and character set that are specified in the parameters.

BOOL SetFont(
    LPCTSTR lpszName,
    BYTE nCharSet=DEFAULT_CHARSET,
    BOOL bExact=FALSE);

Parameters

lpszName
[in] Specifies the font name or prefix.

nCharSet
[in] Specifies the character set.

bExact
[in] Specifies whether lpszName contains the font name or the font prefix.

Return Value

Nonzero if the font was selected successfully; otherwise 0.

Remarks

If bExact is TRUE, this method selects a font that exactly matches the name that you specified as lpszName. If bExact is FALSE, this method selects a font that starts with the text specified as lpszName and that uses the character set that you specified as nCharSet. If nCharSet is set to DEFAULT_CHARSET, the character set will be ignored and only lpszName will be used to select a font.

See also

Hierarchy Chart
Classes
CMFCToolBar Class
CMFCToolBarButton Class
CMFCToolBarComboBoxButton Class
CMFCFontInfo Class
CMFCToolBar::ReplaceButton
Walkthrough: Putting Controls On Toolbars