Classes/FontFamsController.m
/* |
File: FontFamsController.m |
Abstract: A table view controller to manage and display a list of font families to use. |
The view controller manages one array that contains the set of fontFams the app can show |
and the associated font features, in fontFamsForDisplay. |
The table view displays the contents of the fontFamsForDisplay array. |
The view controller has a delegate that it notifies if row in the table view is selected. |
Version: 1.1 |
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*/ |
#import "FontFamsController.h" |
#import "AttributedStringDoc.h" |
#import "CoreText/CoreText.h" |
#pragma mark - |
#pragma mark FontNameAndFeatures |
// Simple data-holder class that contains a font name as presented by the |
// UI and a bitset of valid font features for the given font |
@interface FontNameAndFeatures : NSObject |
{ |
NSString *fontName; |
ASDFeaturesBits featureBits; |
} |
@property (nonatomic, retain) NSString *fontName; |
@property (nonatomic) ASDFeaturesBits featureBits; |
- (id)initWithFontName:(NSString *)fontName; |
- (NSComparisonResult)localizedCaseInsensitiveCompare:(FontNameAndFeatures *)aFontNameAndFeatures; |
@end |
@implementation FontNameAndFeatures |
@synthesize fontName, featureBits; |
// Convenience init for specified font |
- (id)initWithFontName:(NSString *)theFontName |
{ |
if((self = [super init])) { |
self.fontName = theFontName; |
// Look up the font and its feature set |
featureBits = 0; |
CTFontRef fontRef = CTFontCreateWithName((CFStringRef)fontName, 12., NULL); |
CFArrayRef fontFeatureArray = CTFontCopyFeatures(fontRef); |
if (fontFeatureArray) { |
int fontFeatureArrayCount = CFArrayGetCount(fontFeatureArray); |
for (int fontFeatureArrayIndex = 0; fontFeatureArrayIndex < fontFeatureArrayCount; fontFeatureArrayIndex++) { |
NSDictionary *fontFeatureDictionary = (NSDictionary *)CFArrayGetValueAtIndex( fontFeatureArray, |
fontFeatureArrayIndex ); |
NSString* featureName = [fontFeatureDictionary objectForKey:(NSString*)kCTFontFeatureTypeNameKey]; |
// NOTE: For UI purposes, we don't distinguish "exclusive" vs "non-exclusive" features (determined via |
// looking for kCTFontFeatureTypeExclusiveKey in the feature dictionary) -- in other words, we will |
// end up treating all features as exclusive in the UI by only allowing the user to select a single feature |
// per font. |
if ([featureName isEqual:ASD_SMALL_CAPITALS]) { |
featureBits |= ASDFeaturesSmallCaps; |
} |
else if ([featureName isEqual:@"Ligatures"]) { |
featureBits |= ASDFeaturesLigatures; |
} |
else if ([featureName isEqual:@"Number Spacing"]) { |
featureBits |= ASDFeaturesPropNumbers; |
} |
else if ([featureName isEqual:@"Letter Case"]) { |
// We treat "letter case" as equivalent to small caps for this sample |
featureBits |= ASDFeaturesSmallCaps; |
} |
else if ([featureName isEqual:ASD_STYLISTIC_VARS]) { |
// Only expected to be present in Zapfino for this sample |
featureBits |= ASDFeaturesStylisticVariants; |
} |
} |
CFRelease(fontFeatureArray); |
} |
CFRelease(fontRef); |
} |
return self; |
} |
// Comparison method used for sorting fonts in UI list |
- (NSComparisonResult)localizedCaseInsensitiveCompare:(FontNameAndFeatures *)aFontNameAndFeatures { |
return ([self.fontName localizedCaseInsensitiveCompare:aFontNameAndFeatures.fontName]); |
} |
@end |
#pragma mark - |
#pragma mark FontFamsController |
@implementation FontFamsController |
@synthesize delegate, fontFamsForDisplay, selectedFontFam, selectedFontFeature; |
// Helper method to grab featureBits for currently selected font |
- (ASDFeaturesBits)featureBitsForCurrentSelectedFont { |
ASDFeaturesBits featureBits = 0; |
for (FontNameAndFeatures *fontNameAndFeatures in fontFamsForDisplay) { |
if ([selectedFontFam isEqual:fontNameAndFeatures.fontName]) { |
featureBits = fontNameAndFeatures.featureBits; |
} |
} |
return featureBits; |
} |
// Helper method to unselect all fonts in the UI -- used when the user switches samples |
- (void)deselectAllFonts { |
// Mark all fonts and features in our tableview as unselected. |
// This happens when the user selects a different text sample, which |
// initially will use the fonts and styles contained in the text sample. |
selectedFontFam = @""; |
selectedFontFeature = 0; |
// Update tableview cells to reflect our selection state |
[self.tableView reloadData]; |
} |
#pragma mark - |
#pragma mark View lifecycle |
- (void)viewDidLoad { |
[super viewDidLoad]; |
self.title = @"Fonts and Features"; |
self.contentSizeForViewInPopover = CGSizeMake(300.0, 560.0); |
// filter out the available font families to the specified set below - note |
// some platforms may not have all the requested fonts installed |
NSSet* fontCandidatesSet = [NSSet setWithObjects: |
@"BodoniSvtyTwoITCTT-Book", //use PostScript names in CTFontCreateWithName() for best performance |
@"BitstreamVeraSansMono-Roman", |
@"Didot", |
@"Futura-Medium", |
@"Helvetica", |
@"HoeflerText-Regular", |
@"Zapfino", |
nil ]; |
NSMutableSet* familiesSet = [NSMutableSet setWithArray:[UIFont familyNames]]; |
[familiesSet intersectSet:fontCandidatesSet]; |
NSMutableArray *fontFamsForDisplayMutable = [NSMutableArray arrayWithCapacity:7]; |
NSEnumerator *enumerator = [familiesSet objectEnumerator]; |
FontNameAndFeatures *fontNameAndFeatures; |
NSString *candidateName; |
while ((candidateName = [enumerator nextObject])) { |
// Note that more sanity checking is needed for cases where font is not present on system |
fontNameAndFeatures = [[FontNameAndFeatures alloc] initWithFontName:candidateName]; |
[fontFamsForDisplayMutable addObject:fontNameAndFeatures]; |
[fontNameAndFeatures release]; |
} |
fontFamsForDisplay = [[NSArray arrayWithArray:[fontFamsForDisplayMutable sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)]] retain]; |
// Note that at viewDidLoad, none of the fonts are treated as "selected", because the default |
// behavior is to use whatever font (or fonts) are contained within the current sample document data. |
selectedFontFam = @""; |
selectedFontFeature = 0; |
} |
- (BOOL)shouldAutorotate { |
return YES; |
} |
#pragma mark - |
#pragma mark Table view methods |
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { |
return 2; // Font and Font features, although the latter for some fonts may have no feature enabled |
} |
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { |
if (section == 0) { |
return [fontFamsForDisplay count]; |
} else if (section == 1) { |
return 4; // always display 4 features, but we will disable/enable depending on the currently selected font |
} |
return 0; |
} |
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { |
if (section == 0) { |
return @"Fonts"; |
} else if (section == 1) { |
return @"Font Features"; |
} |
return @""; |
} |
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { |
static NSString *CellIdentifier = @"Cell"; |
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; |
if (cell == nil) { |
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; |
} |
cell.selectionStyle = UITableViewCellSelectionStyleBlue; |
cell.accessoryType = UITableViewCellAccessoryNone; |
cell.textLabel.enabled = YES; |
if (indexPath.section == 0) { |
// For Fonts section, set the cell text to the font name |
FontNameAndFeatures *fontNameAndFeatures = [fontFamsForDisplay objectAtIndex:indexPath.row]; |
NSString *fontName = fontNameAndFeatures.fontName; |
if ([selectedFontFam isEqual:fontNameAndFeatures.fontName]) { |
// Mark that this is the currently active font |
cell.accessoryType = UITableViewCellAccessoryCheckmark; |
} |
cell.textLabel.text = fontName; |
cell.textLabel.font = [UIFont fontWithName:fontName size:17.0]; |
} else if (indexPath.section == 1) { |
// For Font Features section, set the cell text to font feature, and select, |
// disable/enable as necessary |
cell.textLabel.font = [UIFont systemFontOfSize:17.0]; |
ASDFeaturesBits featureBits = [self featureBitsForCurrentSelectedFont]; |
switch (indexPath.row) { |
case 0: |
cell.textLabel.text = ASD_SMALL_CAPITALS; |
if (! (featureBits & ASDFeaturesSmallCaps)) { |
cell.selectionStyle = UITableViewCellSelectionStyleNone; |
cell.textLabel.enabled = NO; |
} |
if (selectedFontFeature == ASDFeaturesSmallCaps) { |
cell.accessoryType = UITableViewCellAccessoryCheckmark; |
} |
break; |
case 1: |
cell.textLabel.text = ASD_RARE_LIGATURES; |
if (! (featureBits & ASDFeaturesLigatures)) { |
cell.selectionStyle = UITableViewCellSelectionStyleNone; |
cell.textLabel.enabled = NO; |
} |
if (selectedFontFeature == ASDFeaturesLigatures) { |
cell.accessoryType = UITableViewCellAccessoryCheckmark; |
} |
break; |
case 2: |
cell.textLabel.text = ASD_PROP_NUMBERS; |
if (! (featureBits & ASDFeaturesPropNumbers)) { |
cell.selectionStyle = UITableViewCellSelectionStyleNone; |
cell.textLabel.enabled = NO; |
} |
if (selectedFontFeature == ASDFeaturesPropNumbers) { |
cell.accessoryType = UITableViewCellAccessoryCheckmark; |
} |
break; |
case 3: |
cell.textLabel.text = ASD_STYLISTIC_VARS; |
if (! (featureBits & ASDFeaturesStylisticVariants)) { |
cell.selectionStyle = UITableViewCellSelectionStyleNone; |
cell.textLabel.enabled = NO; |
} |
if (selectedFontFeature == ASDFeaturesStylisticVariants) { |
cell.accessoryType = UITableViewCellAccessoryCheckmark; |
} |
break; |
default: |
cell.textLabel.text = @""; |
break; |
} |
} |
return cell; |
} |
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { |
// Notify the delegate if a row is selected. |
if (indexPath.section == 0) { |
FontNameAndFeatures *fontNameAndFeatures = [fontFamsForDisplay objectAtIndex:indexPath.row]; |
// Track newly selected font for UI. Note that we do not mark font-features as unselected |
// upon selection of new font -- the UI currently tracks these independently based on |
// how CoreTextScrollView keeps track of the current viewOptions. This can result in |
// displaying a "selected but disabled" font feature in cases where the previously |
// selected font feature is not supported in the newly selected font. |
self.selectedFontFam = fontNameAndFeatures.fontName; |
// call reloadData to properly show selection accessory view for new cell and |
// remove it for previous selected cell (if any) |
[self.tableView reloadData]; |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectString:)]) { |
[delegate fontFamsController:self didSelectString:fontNameAndFeatures.fontName]; |
} |
} else if (indexPath.section == 1) { |
ASDFeaturesBits featureBits = [self featureBitsForCurrentSelectedFont]; |
switch (indexPath.row) { |
case 0: |
if (featureBits & ASDFeaturesSmallCaps) { |
if (selectedFontFeature == ASDFeaturesSmallCaps) { |
// was previously the selected font feature, so de-select it and update |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:@""]; |
} |
selectedFontFeature = 0; |
} else { |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:ASD_SMALL_CAPITALS]; |
} |
selectedFontFeature = ASDFeaturesSmallCaps; |
} |
[self.tableView reloadData]; |
} |
break; |
case 1: |
if (featureBits & ASDFeaturesLigatures) { |
if (selectedFontFeature == ASDFeaturesLigatures) { |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:@""]; |
} |
selectedFontFeature = 0; |
} else { |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:ASD_RARE_LIGATURES]; |
} |
selectedFontFeature = ASDFeaturesLigatures; |
} |
[self.tableView reloadData]; |
} |
break; |
case 2: |
if (featureBits & ASDFeaturesPropNumbers) { |
if (selectedFontFeature == ASDFeaturesPropNumbers) { |
// was previously the selected font feature, so de-select it and update |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:@""]; |
} |
selectedFontFeature = 0; |
} else { |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:ASD_PROP_NUMBERS]; |
} |
selectedFontFeature = ASDFeaturesPropNumbers; |
} |
[self.tableView reloadData]; |
} |
break; |
case 3: |
if (featureBits & ASDFeaturesStylisticVariants) { |
if (selectedFontFeature == ASDFeaturesStylisticVariants) { |
// was previously the selected font feature, so de-select it and update |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:@""]; |
} |
selectedFontFeature = 0; |
} else { |
if (delegate && [delegate respondsToSelector:@selector(fontFamsController:didSelectFeaturesString:)]) { |
[delegate fontFamsController:self didSelectFeaturesString:ASD_STYLISTIC_VARS]; |
} |
selectedFontFeature = ASDFeaturesStylisticVariants; |
} |
[self.tableView reloadData]; |
} |
break; |
default: |
break; |
} |
} |
} |
#pragma mark - |
#pragma mark Memory management |
- (void)dealloc { |
[fontFamsForDisplay release]; |
[super dealloc]; |
} |
@end |
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