Fonts.c

/*
 
 File: Fonts.h
 
 Abstract: Defines utility functions for interacting with fonts in the
 application.
 
 Version: 1.0
 
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 */ 

#include "Fonts.h"
#include "ArcView.h"

// Change the font based on the font selection event from the Fonts window. 
void ChangeFont(EventRef inEvent, HIWindowRef window)
{
	CTFontDescriptorRef	descriptor, newDescriptor;
	CGFloat				size;
	
	OSStatus			err;
	ArcView				*arcView;
	
	// Use the front window if none specified.
	if (window == NULL)
		window = FrontNonFloatingWindow();
	
	arcView = GetArcViewForWindow(window);
	
	// Get the original font descriptor from the view
	descriptor = CTFontCopyFontDescriptor(ArcViewGetFont(arcView));
	size = CTFontGetSize(ArcViewGetFont(arcView));

	err = GetEventParameter(inEvent, kEventParamCTFontDescriptor, typeCTFontDescriptorRef, NULL, sizeof(newDescriptor), NULL, &newDescriptor);
	if (err == noErr && newDescriptor != NULL) {
		CFDictionaryRef newAttributes = CTFontDescriptorCopyAttributes(newDescriptor);
		
		// Merge the changes from the font panel with our current font. The font panel is smart enough to provide the necessary items to update the font correctly, and CoreText merges the necessary attributes such as variations and features.
		newDescriptor = CTFontDescriptorCreateCopyWithAttributes(descriptor, newAttributes);
		
		CFRelease(newAttributes);
		CFRelease(descriptor);
		descriptor = newDescriptor;
	}	// Create our new font from the descriptor
    
	if (descriptor != NULL) {
		CTFontRef font = CTFontCreateWithFontDescriptor(descriptor, 0., NULL);
		
		// Set the font to the view
		ArcViewSetFont(arcView, font);
		
		CFRelease(descriptor);
		CFRelease(font);
	}
}

// Toggles the specified trait of the font for the view in the specified window.
void ToggleFontTrait(HIWindowRef window, CTFontSymbolicTraits trait) 
{
	ArcView					*arcView;
	CTFontSymbolicTraits	origTraits;
	CTFontRef				convertedFont;
	CTFontRef				font;
	
	// Use the front window if none specified
	if (window == NULL)
		window = FrontNonFloatingWindow();
	
	arcView = GetArcViewForWindow(window);
	
	// Get the current font and traits
	font = ArcViewGetFont(arcView);
	origTraits = CTFontGetSymbolicTraits(font);
	
	// Add or remove the trait depending on whether the font currently has it or not. Note that the mask is always the trait(s) we are modifying and the trait value is the value we want to assign to the traits. Traits are a bitmask.
	if ((origTraits & trait) == 0) {
		convertedFont = CTFontCreateCopyWithSymbolicTraits(font, 0., NULL,  trait, trait);
	} else {
		convertedFont = CTFontCreateCopyWithSymbolicTraits(font, 0., NULL,  0, trait);
	}
	// If we got a new font, set it to the view
	if (convertedFont != NULL) {
		ArcViewSetFont(arcView, convertedFont);
		
		CFRelease(convertedFont);
	}
}

// Check to see if the font can toggle the specified trait. This is accomplished by attempting to switch the trait's value to the opposite of the current value. 
Boolean CanToggleFontTrait(CTFontRef font, CTFontSymbolicTraits trait) 
{
	Boolean					result = false;
	CTFontSymbolicTraits	origTraits;
	CTFontRef				convertedFont;
	
	// Get the original traits
	origTraits = CTFontGetSymbolicTraits(font);
	
	// Try to add or remove the trait depending on whether the font currently has it or not. Note that the mask is always the trait(s) we are modifying and the trait value is the value we want to assign to the traits. Traits are a bitmask.
	if ((origTraits & trait) == 0) {
		convertedFont = CTFontCreateCopyWithSymbolicTraits(font, 0., NULL,  trait, trait);
	} else {
		convertedFont = CTFontCreateCopyWithSymbolicTraits(font, 0., NULL,  0, trait);
	}
	if (convertedFont != NULL) {
		// Success, release the font and return true
		CFRelease(convertedFont);
		result = true;
	}
	return result;
}