| // Copyright 2019-present the Material Components for iOS authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #import "MDCFontScaler.h" |
| |
| #import <objc/runtime.h> |
| |
| #import "UIFont+MaterialScalable.h" |
| #import "private/MDCTypographyUtilities.h" |
| |
| MDCTextStyle const MDCTextStyleHeadline1 = @"MDC.TextStyle.Headline1"; |
| MDCTextStyle const MDCTextStyleHeadline2 = @"MDC.TextStyle.Headline2"; |
| MDCTextStyle const MDCTextStyleHeadline3 = @"MDC.TextStyle.Headline3"; |
| MDCTextStyle const MDCTextStyleHeadline4 = @"MDC.TextStyle.Headline4"; |
| MDCTextStyle const MDCTextStyleHeadline5 = @"MDC.TextStyle.Headline5"; |
| MDCTextStyle const MDCTextStyleHeadline6 = @"MDC.TextStyle.Headline6"; |
| MDCTextStyle const MDCTextStyleSubtitle1 = @"MDC.TextStyle.Subtitle1"; |
| MDCTextStyle const MDCTextStyleSubtitle2 = @"MDC.TextStyle.Subtitle2"; |
| MDCTextStyle const MDCTextStyleBody1 = @"MDC.TextStyle.Body1"; |
| MDCTextStyle const MDCTextStyleBody2 = @"MDC.TextStyle.Body2"; |
| MDCTextStyle const MDCTextStyleButton = @"MDC.TextStyle.Button"; |
| MDCTextStyle const MDCTextStyleCaption = @"MDC.TextStyle.Caption"; |
| MDCTextStyle const MDCTextStyleOverline = @"MDC.TextStyle.Overline"; |
| |
| @implementation MDCFontScaler { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *_scalingCurve; |
| MDCTextStyle _textStyle; |
| } |
| |
| + (instancetype)scalerForMaterialTextStyle:(MDCTextStyle)textStyle { |
| return [[MDCFontScaler alloc] initForMaterialTextStyle:textStyle]; |
| } |
| |
| - (instancetype)initForMaterialTextStyle:(MDCTextStyle)textStyle { |
| self = [super init]; |
| if (self) { |
| _textStyle = [textStyle copy]; |
| |
| // NOTE: All scaling curves MUST include a full set of values for ALL UIContentSizeCategory |
| // values. This values must not decrease as the category size increases. To put it another |
| // way, the value for UIContentSizeCategoryLarge must not be smaller than the value for |
| // UIContentSizeCategoryMedium. |
| if ([MDCTextStyleHeadline1 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @84, |
| UIContentSizeCategorySmall : @88, |
| UIContentSizeCategoryMedium : @92, |
| UIContentSizeCategoryLarge : @96, |
| UIContentSizeCategoryExtraLarge : @100, |
| UIContentSizeCategoryExtraExtraLarge : @104, |
| UIContentSizeCategoryExtraExtraExtraLarge : @108, |
| UIContentSizeCategoryAccessibilityMedium : @108, |
| UIContentSizeCategoryAccessibilityLarge : @108, |
| UIContentSizeCategoryAccessibilityExtraLarge : @108, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @108, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @108 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleHeadline2 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @54, |
| UIContentSizeCategorySmall : @56, |
| UIContentSizeCategoryMedium : @58, |
| UIContentSizeCategoryLarge : @60, |
| UIContentSizeCategoryExtraLarge : @62, |
| UIContentSizeCategoryExtraExtraLarge : @64, |
| UIContentSizeCategoryExtraExtraExtraLarge : @66, |
| UIContentSizeCategoryAccessibilityMedium : @66, |
| UIContentSizeCategoryAccessibilityLarge : @66, |
| UIContentSizeCategoryAccessibilityExtraLarge : @66, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @66, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @66 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleHeadline3 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @42, |
| UIContentSizeCategorySmall : @44, |
| UIContentSizeCategoryMedium : @46, |
| UIContentSizeCategoryLarge : @48, |
| UIContentSizeCategoryExtraLarge : @50, |
| UIContentSizeCategoryExtraExtraLarge : @52, |
| UIContentSizeCategoryExtraExtraExtraLarge : @54, |
| UIContentSizeCategoryAccessibilityMedium : @54, |
| UIContentSizeCategoryAccessibilityLarge : @54, |
| UIContentSizeCategoryAccessibilityExtraLarge : @54, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @54, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @54 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleHeadline4 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @28, |
| UIContentSizeCategorySmall : @30, |
| UIContentSizeCategoryMedium : @32, |
| UIContentSizeCategoryLarge : @34, |
| UIContentSizeCategoryExtraLarge : @36, |
| UIContentSizeCategoryExtraExtraLarge : @38, |
| UIContentSizeCategoryExtraExtraExtraLarge : @40, |
| UIContentSizeCategoryAccessibilityMedium : @42, |
| UIContentSizeCategoryAccessibilityLarge : @42, |
| UIContentSizeCategoryAccessibilityExtraLarge : @42, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @42, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @42 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleHeadline5 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @21, |
| UIContentSizeCategorySmall : @22, |
| UIContentSizeCategoryMedium : @23, |
| UIContentSizeCategoryLarge : @24, |
| UIContentSizeCategoryExtraLarge : @26, |
| UIContentSizeCategoryExtraExtraLarge : @28, |
| UIContentSizeCategoryExtraExtraExtraLarge : @30, |
| UIContentSizeCategoryAccessibilityMedium : @32, |
| UIContentSizeCategoryAccessibilityLarge : @32, |
| UIContentSizeCategoryAccessibilityExtraLarge : @32, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @32, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @32 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleHeadline6 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @17, |
| UIContentSizeCategorySmall : @18, |
| UIContentSizeCategoryMedium : @19, |
| UIContentSizeCategoryLarge : @20, |
| UIContentSizeCategoryExtraLarge : @22, |
| UIContentSizeCategoryExtraExtraLarge : @24, |
| UIContentSizeCategoryExtraExtraExtraLarge : @26, |
| UIContentSizeCategoryAccessibilityMedium : @28, |
| UIContentSizeCategoryAccessibilityLarge : @28, |
| UIContentSizeCategoryAccessibilityExtraLarge : @28, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @28, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @28 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleSubtitle1 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @13, |
| UIContentSizeCategorySmall : @14, |
| UIContentSizeCategoryMedium : @15, |
| UIContentSizeCategoryLarge : @16, |
| UIContentSizeCategoryExtraLarge : @18, |
| UIContentSizeCategoryExtraExtraLarge : @20, |
| UIContentSizeCategoryExtraExtraExtraLarge : @22, |
| UIContentSizeCategoryAccessibilityMedium : @25, |
| UIContentSizeCategoryAccessibilityLarge : @30, |
| UIContentSizeCategoryAccessibilityExtraLarge : @37, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @44, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @52 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleSubtitle2 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @11, |
| UIContentSizeCategorySmall : @12, |
| UIContentSizeCategoryMedium : @13, |
| UIContentSizeCategoryLarge : @14, |
| UIContentSizeCategoryExtraLarge : @16, |
| UIContentSizeCategoryExtraExtraLarge : @18, |
| UIContentSizeCategoryExtraExtraExtraLarge : @20, |
| UIContentSizeCategoryAccessibilityMedium : @22, |
| UIContentSizeCategoryAccessibilityLarge : @25, |
| UIContentSizeCategoryAccessibilityExtraLarge : @30, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @36, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @42 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleBody2 isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @11, |
| UIContentSizeCategorySmall : @12, |
| UIContentSizeCategoryMedium : @13, |
| UIContentSizeCategoryLarge : @14, |
| UIContentSizeCategoryExtraLarge : @16, |
| UIContentSizeCategoryExtraExtraLarge : @18, |
| UIContentSizeCategoryExtraExtraExtraLarge : @20, |
| UIContentSizeCategoryAccessibilityMedium : @22, |
| UIContentSizeCategoryAccessibilityLarge : @25, |
| UIContentSizeCategoryAccessibilityExtraLarge : @30, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @36, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @42 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleButton isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @11, |
| UIContentSizeCategorySmall : @12, |
| UIContentSizeCategoryMedium : @13, |
| UIContentSizeCategoryLarge : @14, |
| UIContentSizeCategoryExtraLarge : @16, |
| UIContentSizeCategoryExtraExtraLarge : @18, |
| UIContentSizeCategoryExtraExtraExtraLarge : @20, |
| UIContentSizeCategoryAccessibilityMedium : @22, |
| UIContentSizeCategoryAccessibilityLarge : @24, |
| UIContentSizeCategoryAccessibilityExtraLarge : @26, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @28, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @30 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleCaption isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @11, |
| UIContentSizeCategorySmall : @11, |
| UIContentSizeCategoryMedium : @11, |
| UIContentSizeCategoryLarge : @12, |
| UIContentSizeCategoryExtraLarge : @14, |
| UIContentSizeCategoryExtraExtraLarge : @16, |
| UIContentSizeCategoryExtraExtraExtraLarge : @18, |
| UIContentSizeCategoryAccessibilityMedium : @20, |
| UIContentSizeCategoryAccessibilityLarge : @22, |
| UIContentSizeCategoryAccessibilityExtraLarge : @24, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @26, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @28 |
| }; |
| _scalingCurve = scalingCurve; |
| } else if ([MDCTextStyleOverline isEqualToString:textStyle]) { |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @8, |
| UIContentSizeCategorySmall : @8, |
| UIContentSizeCategoryMedium : @9, |
| UIContentSizeCategoryLarge : @10, |
| UIContentSizeCategoryExtraLarge : @12, |
| UIContentSizeCategoryExtraExtraLarge : @14, |
| UIContentSizeCategoryExtraExtraExtraLarge : @16, |
| UIContentSizeCategoryAccessibilityMedium : @18, |
| UIContentSizeCategoryAccessibilityLarge : @20, |
| UIContentSizeCategoryAccessibilityExtraLarge : @22, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @24, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @26 |
| }; |
| _scalingCurve = scalingCurve; |
| } else { |
| // If nothing matches, return the metrics for MDCTextStyleBody1 |
| _textStyle = [MDCTextStyleBody1 copy]; |
| NSDictionary<UIContentSizeCategory, NSNumber *> *scalingCurve = @{ |
| UIContentSizeCategoryExtraSmall : @13, |
| UIContentSizeCategorySmall : @14, |
| UIContentSizeCategoryMedium : @15, |
| UIContentSizeCategoryLarge : @16, |
| UIContentSizeCategoryExtraLarge : @18, |
| UIContentSizeCategoryExtraExtraLarge : @20, |
| UIContentSizeCategoryExtraExtraExtraLarge : @22, |
| UIContentSizeCategoryAccessibilityMedium : @26, |
| UIContentSizeCategoryAccessibilityLarge : @30, |
| UIContentSizeCategoryAccessibilityExtraLarge : @34, |
| UIContentSizeCategoryAccessibilityExtraExtraLarge : @38, |
| UIContentSizeCategoryAccessibilityExtraExtraExtraLarge : @42 |
| }; |
| _scalingCurve = scalingCurve; |
| } |
| } |
| |
| return self; |
| } |
| |
| - (UIFont *)scaledFontWithFont:(UIFont *)font { |
| // If it is available, query the preferredContentSizeCategory. |
| UIContentSizeCategory sizeCategory = GetCurrentSizeCategory(); |
| |
| // We create a new font to ensure we have a complete set of font traits. |
| // They we apply our new scaling curve before returning a scaled font. |
| UIFont *templateFont = [UIFont fontWithDescriptor:font.fontDescriptor size:0.0]; |
| templateFont.mdc_scalingCurve = _scalingCurve; |
| UIFont *scaledFont = [templateFont mdc_scaledFontForSizeCategory:sizeCategory]; |
| |
| return scaledFont; |
| } |
| |
| - (NSString *)description { |
| NSString *superDescription = [super description]; |
| NSString *styleDescription = @"No Attached Style"; |
| if (_textStyle) { |
| styleDescription = _textStyle; |
| } |
| |
| return [NSString stringWithFormat:@"%@ %@", superDescription, styleDescription]; |
| } |
| |
| @end |
