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