Symbian3/PDK/Source/GUID-72986B3C-047C-5411-8F15-BC9C65C3289C.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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permissions -rw-r--r--
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept xml:lang="en" id="GUID-72986B3C-047C-5411-8F15-BC9C65C3289C"><title>Using Typefaces </title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Typefaces are stored in the Font Store. Each typeface in the store has an index number. </p> <p>You can examine the contents of the typeface store using functions in <xref href="GUID-B6AB1A2A-705C-3ABA-8BBB-C36F3319501F.dita"><apiname>CGraphicsDevice.</apiname></xref>  </p> <p>To find the number of typefaces available: </p> <codeblock id="GUID-DD17B13B-29E0-5584-B85E-639FD2BAB7DF" xml:space="preserve">
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// Find the number of typefaces
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TInt numTypefaces = iCoeEnv-&gt;ScreenDevice()-&gt;NumTypefaces();</codeblock> <p>You can find out about a type face using the <codeph>TypefaceSupport</codeph> function which returns a <xref href="GUID-39BEE3B2-6A44-33EC-8F93-31E633844086.dita"><apiname>TTypeFaceSupport</apiname></xref>. Each typeface can have a number of sizes or be scalable between a minimum and maximum size. </p> <codeblock id="GUID-B47975BF-3B7A-57B2-854E-1D59166A47A3" xml:space="preserve">
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class TTypefaceSupport
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    {
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public:    
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    TTypeface iTypeface  ;  // The name and attributes of the typeface.
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    TInt iNumHeights;       // The number of distinct font heights available in the typeface. 
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    TInt iMinHeightInTwips; // The typeface's minimum font height, in twips.
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    TInt iMaxHeightInTwips; // The typeface's maximum font height, in twips. 
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    TBool iIsScalable;      // ETrue if  scalable, otherwise EFalse. 
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    };
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class TTypeface
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    {
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public:
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    enum
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        {
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        EProportional = 1, // (e.g. Swiss)
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        ESerif = 2, // (e.g. Times )
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        ESymbol = 4, // (e.g. Symbol )
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        };
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public:
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    ...
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    IMPORT_C TBool IsProportional() const;
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    IMPORT_C TBool IsSerif() const;
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    IMPORT_C TBool IsSymbol() const;
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    TBufC&lt;KMaxTypefaceNameLength&gt; iName;
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    ....
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    };
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</codeblock> <p>The code below illustrates a simple iteration through the typeface store (see also <xref href="GUID-78FB26E2-AA60-5531-B2FE-4FA6C88F2D47.dita">selecting a font</xref>). </p> <codeblock id="GUID-368C7CBB-254E-5904-A3C5-51BB1FA94931" xml:space="preserve">...
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CGraphicsDevice* gDev = iCoeEnv-&gt;ScreenDevice() ;
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CWindowGc&amp; gc = SystemGc() ;
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TPoint textPosition ( 0 , 0 ) ; // Start position for drawing text.
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// display a list of typefaces - with each in its own typeface
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for ( index = 0 ; index &lt; numTypefaces ; index++ )
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    {
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    // get the next typeface
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    TTypefaceSupport typeface ;
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    gDev-&gt;TypefaceSupport( typeface, index ) ;
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    TPtrC fontName = typeface.iTypeface.iName.Des() ;
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    // use the typeface to get a font 
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    TFontSpec fontSpec( fontName, 300 ) ; // 300 twips font height
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    CFont* font ; 
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    gDev-&gt;GetNearestFontToMaxHeightInTwips( font , fontSpec ) ;
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    // use the font in the graphics context
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    gc.UseFont( font ) ;
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    // display the name of the font 
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    textPosition.iTL.iY += font.iAscentInPixels ;
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    gc.DrawText( fontName, textPosition ) ; // draw text on baseline
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    textPosition.iTL.iY += ( font.iDescentInPixels + KWhiteSpaceBetweenLines ) ;
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    // 
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    gc.DiscardFont( font ) ;
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    gDev-&gt;ReleaseFont( font ) ;
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    }
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...</codeblock> </conbody><related-links><link href="GUID-C1B080D9-9C6C-520B-B73E-4EB344B1FC5E.dita"><linktext>GDI Collection Overview</linktext> </link> <link href="GUID-90644B52-69D7-595C-95E3-D6F7A30C060D.dita"><linktext> Font and Text Services Collection
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                Overview</linktext> </link> <link href="GUID-71DADA82-3ABC-52D2-8360-33FAEB2E5DE9.dita"><linktext> Font and Bitmap Server
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                Component Overview </linktext> </link> <link href="GUID-416A3756-B5D5-5BCD-830E-2371C5F6B502.dita"><linktext>Font Store Component
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                Overview</linktext> </link> </related-links></concept>