112 lines
2.3 KiB
C++
112 lines
2.3 KiB
C++
/*
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* QuartzTextLayout.h
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*
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* Original Code by Evan Jones on Wed Oct 02 2002.
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* Contributors:
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* Shane Caraveo, ActiveState
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* Bernd Paradies, Adobe
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*
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*/
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#ifndef _QUARTZ_TEXT_LAYOUT_H
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#define _QUARTZ_TEXT_LAYOUT_H
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#include <Cocoa/Cocoa.h>
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#include "QuartzTextStyle.h"
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class QuartzTextLayout
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{
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public:
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/** Create a text layout for drawing on the specified context. */
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explicit QuartzTextLayout( CGContextRef context )
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{
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mString = NULL;
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mLine = NULL;
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stringLength = 0;
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setContext(context);
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}
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~QuartzTextLayout()
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{
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if ( mString != NULL )
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{
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CFRelease(mString);
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mString = NULL;
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}
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if ( mLine != NULL )
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{
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CFRelease(mLine);
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mLine = NULL;
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}
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}
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inline void setText( const UInt8* buffer, size_t byteLength, CFStringEncoding encoding, const QuartzTextStyle& r )
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{
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CFStringRef str = CFStringCreateWithBytes( NULL, buffer, byteLength, encoding, false );
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if (!str)
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return;
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stringLength = CFStringGetLength(str);
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CFMutableDictionaryRef stringAttribs = r.getCTStyle();
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if (mString != NULL)
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CFRelease(mString);
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mString = ::CFAttributedStringCreate(NULL, str, stringAttribs);
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if (mLine != NULL)
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CFRelease(mLine);
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mLine = ::CTLineCreateWithAttributedString(mString);
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CFRelease( str );
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}
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/** Draw the text layout into the current CGContext at the specified position.
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* @param x The x axis position to draw the baseline in the current CGContext.
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* @param y The y axis position to draw the baseline in the current CGContext. */
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void draw( float x, float y )
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{
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if (mLine == NULL)
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return;
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::CGContextSetTextMatrix(gc, CGAffineTransformMakeScale(1.0, -1.0));
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// Set the text drawing position.
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::CGContextSetTextPosition(gc, x, y);
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// And finally, draw!
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::CTLineDraw(mLine, gc);
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}
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float MeasureStringWidth()
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{
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if (mLine == NULL)
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return 0.0f;
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return static_cast<float>(::CTLineGetTypographicBounds(mLine, NULL, NULL, NULL));
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}
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CTLineRef getCTLine() {
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return mLine;
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}
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CFIndex getStringLength() {
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return stringLength;
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}
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inline void setContext (CGContextRef context)
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{
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gc = context;
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}
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private:
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CGContextRef gc;
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CFAttributedStringRef mString;
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CTLineRef mLine;
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CFIndex stringLength;
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};
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#endif
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