179 lines
5.4 KiB
C++
179 lines
5.4 KiB
C++
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/**********************************************************************/
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/** Microsoft Windows/NT **/
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/** Copyright(c) Microsoft Corp., 1991 **/
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/**********************************************************************/
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/*
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bltfont.hxx
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This file contains the definition for the BLT FONT class.
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FILE HISTORY:
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Johnl 03-Apr-1991 Created
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beng 14-May-1991 Made depend on blt.hxx for clients
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terryk 26-Nov-1991 Added FONT_DEFAULT_FIXED_PITCH
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*/
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#ifndef _BLT_HXX_
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#error "Don't include this file directly; instead, include it through blt.hxx"
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#endif // _BLT_HXX_
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#ifndef _BLTFONT_HXX_
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#define _BLTFONT_HXX_
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/* Default fonts (will currently resolve to Helv. 8).
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*/
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enum FontType { FONT_DEFAULT,
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FONT_DEFAULT_FIXED_PITCH,
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FONT_DEFAULT_BOLD,
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FONT_DEFAULT_ITALIC,
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FONT_DEFAULT_BOLD_ITALIC
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};
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/* Font attributes. Note that FONT_ATT_DEFAULT is mututally exclusive
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* from all other attributes.
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*/
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enum FontAttributes { FONT_ATT_DEFAULT = 0x0000, // Use default attributes
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FONT_ATT_ITALIC = 0x0001,
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FONT_ATT_BOLD = 0x0002,
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FONT_ATT_UNDERLINE = 0x0004,
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FONT_ATT_STRIKEOUT = 0x0008
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};
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/*************************************************************************
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NAME: FONT
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SYNOPSIS: The FONT class is a wrapper for the Windows font creation
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and deletion process. It can be very complex so it is
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worth wrapping in a class.
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INTERFACE:
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FONT( )
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Constructor, where FontType is one of the default fonts
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(FONT_DEFAULT, FONT_DEFAULT_BOLD, FONT_DEFAULT_ITALIC,
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or FONT_DEFAULT_BOLD_ITALIC).
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FONT()
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Constructor, where LOGFONT is a filled in LOGFONT structure
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FONT()
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Constructor, where:
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pchFaceName is the name of the font ("Helv", TmsRmn" etc.)
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lfPitchAndFamily is the as in the LOGFONT documentation
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nPointSize is the point size of the font.
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FontAttributes is a combination of the FontAttributes
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enum, "|"ed together.
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~FONT()
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Destructor, deletes the font
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HFONT QueryFontHandle()
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Retrieves the handle to the requested font. Will assert out
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under debug if an error has occurred.
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SetFont()
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Takes a handle to a new font. Must already created be created.
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Can use this method to prevent deleting of the font if you
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the set the HFONT to NULL.
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SetFont()
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Takes a LOGFONT. Will delete the old font (if there is one)
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and creates a new font based on the LOGFONT structure.
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QueryError()
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Returns NERR_Success if construction was successful
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CAVEATS:
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NOTES: SetXxx methods should be avoided because they require the FONT
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class to regenerate the font. It is generally better to
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simply declare a new FONT object with the desired attributes.
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HISTORY:
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Johnl 03-Apr-1991 Created
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beng 04-Oct-1991 Correct data types
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**************************************************************************/
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DLL_CLASS FONT : public BASE
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{
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private:
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HFONT _hFont;
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public:
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FONT( enum FontType );
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FONT( const LOGFONT & logfont );
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FONT( const TCHAR * pchFaceName, BYTE lfPitchAndFamily,
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INT nPointSize, enum FontAttributes fontatt );
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~FONT();
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HFONT QueryHandle() const
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{ return _hFont; }
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APIERR SetFont( HFONT hNewFont );
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APIERR SetFont( const LOGFONT & logFont );
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};
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/*******************************************************************
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NAME: BLTLogUnits2Points
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SYNOPSIS: Converts a number of logical units to the corresponding
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Point size
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ENTRY: nLogUnits - Count of logical units to convert to points
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EXIT: Returns the number of points
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NOTES: We are assuming that the default mapping mode (MM_TEXT) is
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used. In this mapping mode, one logical unit is one
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pixel. We grab the desktop's pixels per logical inch.
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A point is 1/72 of an inch.
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See Petzold's chapter on fonts for a discussion of fonts.
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HISTORY:
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Johnl 05-Apr-1991 Created
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********************************************************************/
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inline INT BLTLogUnits2Points( INT nLogUnits )
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{
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SCREEN_DC dcScreen;
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INT nLogUnitsPerInch = GetDeviceCaps( dcScreen.QueryHdc(), LOGPIXELSY );
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return ( (72 * nLogUnits)/nLogUnitsPerInch );
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}
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/*******************************************************************
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NAME: BLTPoints2LogUnits
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SYNOPSIS: Converts a point size to a count of logical units.
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ENTRY: nPoints is the font point size
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EXIT: Returns the logical units
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NOTES: See BLTLogUnits2Points for a discussion
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HISTORY:
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Johnl 05-Apr-1991 Created
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********************************************************************/
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inline INT BLTPoints2LogUnits( INT nPoints )
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{
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SCREEN_DC dcScreen;
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INT nLogUnitsPerInch = GetDeviceCaps( dcScreen.QueryHdc(), LOGPIXELSY );
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return ( (nPoints * nLogUnitsPerInch)/72 );
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}
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#endif // _BLTFONT_HXX_ - end of file
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