CoreTextArcCocoa/APLDocument.m

/*
     File: APLDocument.m 
 Abstract: n/a 
  Version: 1.2 
  
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 */
 
#import "APLDocument.h"
#import "APLCoreTextArcView.h"
 
#import <Foundation/NSObjCRuntime.h>
#import <objc/runtime.h>
 
 
@interface NSFont (FontStyleAdditions)
- (BOOL)isBold;
- (BOOL)isItalic;
- (BOOL)canToggleTrait:(NSFontTraitMask)trait;
@end
 
 
@interface APLDocument ()
 
@property (weak) IBOutlet APLCoreTextArcView *arcView;
@property (weak) IBOutlet NSButton *boldButton;
@property (weak) IBOutlet NSButton *italicButton;
 
@end
 
 
@implementation APLDocument
 
 
- (void)controlTextDidChange:(NSNotification *)notification {
    [self setString:[notification object]];
}
 
 
- (IBAction)setString:(id)sender {
    self.arcView.string = [sender stringValue];
    [self updateDisplay];
}
 
 
- (IBAction)setShowsGlyphOutlines:(id)sender {
    self.arcView.showsGlyphBounds = ([sender state] == NSOnState);
    [self updateDisplay];
}
 
 
- (IBAction)setShowsLineMetrics:(id)sender {
    self.arcView.showsLineMetrics = ([sender state] == NSOnState);
    [self updateDisplay];
}
 
 
- (IBAction)setDimsSubstitutedGlyphs:(id)sender {
    self.arcView.dimsSubstitutedGlyphs = ([sender state] == NSOnState);
    [self updateDisplay];
}
 
 
#pragma mark - Managing font
 
- (void)changeFont:(id)sender {
    self.arcView.font = [sender convertFont:self.arcView.font];
    [self updateDisplay];
}
 
 
- (void)setArcViewFont:(NSFont *)newFont {
    if (newFont != nil) {
        self.arcView.font = newFont;
        [self updateDisplay];
        [[NSFontPanel sharedFontPanel] setPanelFont:self.arcView.font isMultiple:NO];
    }
}
 
/*
 The logic of toggling state from a button is the opposite of that from a menu item.
 */
- (IBAction)takeBoldSettingFromButton:(NSButton *)sender {
    if ([sender state] == NSOnState) {
        [self changeArcViewFontTrait:NSFontBoldTrait to:YES];
    }
    else {
        [self changeArcViewFontTrait:NSFontBoldTrait to:NO];
    }
}
 
 
- (IBAction)takeBoldSettingFrom:(id)sender {
    if ([sender state] == NSOffState) {
        [self changeArcViewFontTrait:NSFontBoldTrait to:YES];
    }
    else {
        [self changeArcViewFontTrait:NSFontBoldTrait to:NO];
    }
}
 
 
- (IBAction)takeItalicSettingFromButton:(NSButton *)sender {
    if ([sender state] == NSOnState) {
        [self changeArcViewFontTrait:NSFontItalicTrait to:YES];
    }
    else {
        [self changeArcViewFontTrait:NSFontItalicTrait to:NO];
    }
}
 
 
- (IBAction)takeItalicSettingFrom:(id)sender {
    if ([sender state] == NSOffState) {
        [self changeArcViewFontTrait:NSFontItalicTrait to:YES];
    }
    else {
        [self changeArcViewFontTrait:NSFontItalicTrait to:NO];
    }
}
 
 
- (void)changeArcViewFontTrait:(NSInteger)fontTrait to:(BOOL)yn{
 
    NSFont *newFont;
    if (yn) {
        newFont = [[NSFontManager sharedFontManager] convertFont:self.arcView.font toHaveTrait:fontTrait];
    }
    else {
        newFont = [[NSFontManager sharedFontManager] convertFont:self.arcView.font toNotHaveTrait:fontTrait];
    }
    [self setArcViewFont:newFont];
}
 
 
#pragma mark - Managing UI
 
- (void)updateDisplay {
    [self.arcView setNeedsDisplay:YES];
 
    // Update the bold button.
    if ([self.arcView.font isBold]) {
        [self.boldButton setState:NSOnState];
    }
    else {
        [self.boldButton setState:NSOffState];
    }
 
    if ([self.arcView.font canToggleTrait:NSFontBoldTrait]) {
        [self.boldButton setEnabled:YES];
    }
    else {
        [self.boldButton setEnabled:NO];
    }
    
    
    // Update the italic button.
    if ([self.arcView.font isItalic]) {
        [self.italicButton setState:NSOnState];
    }
    else {
        [self.italicButton setState:NSOffState];
    }
 
    if ([self.arcView.font canToggleTrait:NSFontItalicTrait]) {
        [self.italicButton setEnabled:YES];
    }
    else {
        [self.italicButton setEnabled:NO];
    }
    
    // Update the window title.
    for (NSWindowController *controller in [self windowControllers]) {
        [[controller window] setTitle:[self displayName]];
    }
}
 
 
- (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)item {
    SEL action = [item action];
 
    if (sel_isEqual(action, @selector(takeBoldSettingFrom:))) {
        // Set the state based on the presence of the trait.
        if ([(id)item respondsToSelector:@selector(setState:)]) {
            if ([self.arcView.font isBold]) {
                [(id)item setState:NSOnState];
            }
            else {
                [(id)item setState:NSOffState];
            }
        }
        // Test whether we can convert the traits to enable or disable the control.
        return [self.arcView.font canToggleTrait:NSFontBoldTrait];
    }
    else if (sel_isEqual(action, @selector(takeItalicSettingFrom:))) {
        // Set the state based on the presence of the trait.
        if ([(id)item respondsToSelector:@selector(setState:)]) {
            if ([self.arcView.font isItalic]) {
                [(id)item setState:NSOnState];
            }
            else {
                [(id)item setState:NSOffState];
            }
        }
        // Test whether we can convert the traits to enable or disable the control.
        return [self.arcView.font canToggleTrait:NSFontItalicTrait];
    }
    return YES;
}
 
 
- (void)windowDidBecomeKey:(NSNotification *)notification {
    [[NSFontManager sharedFontManager] setTarget:self];
    [[NSFontPanel sharedFontPanel] setPanelFont:self.arcView.font isMultiple:NO];
}
 
 
#pragma - NSDocument overrides
 
- (NSString *)displayName {
    return self.arcView.string;
}
 
 
- (NSString *)windowNibName {
    return @"APLDocument";
}
 
@end
 
 
#pragma mark - NSFont (FontStyleAdditions
 
/*
 NSFont category for convenience methods to return information about the font in a format that's more easly used in this particular application.
 */
@implementation NSFont (FontStyleAdditions)
 
- (BOOL)isBold {
    return ([[self fontDescriptor] symbolicTraits] & NSFontBoldTrait);
}
 
 
- (BOOL)isItalic {
    return ([[self fontDescriptor] symbolicTraits] & NSFontItalicTrait);
}
 
 
- (BOOL)canToggleTrait:(NSFontTraitMask)trait {
    NSFont *testFont = nil;
    if ([[self fontDescriptor] symbolicTraits] & trait) {
        testFont = [[NSFontManager sharedFontManager] convertFont:self toNotHaveTrait:trait];
    }
    else {
        testFont = [[NSFontManager sharedFontManager] convertFont:self toHaveTrait:trait];
    }
 
    if (testFont != nil) {
        if (([[testFont fontDescriptor] symbolicTraits] ^ [[self fontDescriptor] symbolicTraits]) == trait) {
            return YES;
        }
    }
    return NO;
}
 
@end