components/TextFields/src/FontThemer/MDCTextFieldFontThemer.m

// Copyright 2018-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 "MDCTextFieldFontThemer.h"

#import "MaterialTextFields.h"
#import "MaterialThemes.h"

@implementation MDCTextFieldFontThemer

+ (void)applyFontScheme:(id<MDCFontScheme>)fontScheme
    toTextInputController:(id<MDCTextInputController>)textInputController {
  textInputController.inlinePlaceholderFont = fontScheme.body1;
  textInputController.leadingUnderlineLabelFont = fontScheme.caption;
  textInputController.trailingUnderlineLabelFont = fontScheme.caption;
  if ([textInputController
          conformsToProtocol:@protocol(MDCTextInputControllerFloatingPlaceholder)]) {
    id<MDCTextInputControllerFloatingPlaceholder> textInputControllerFloatingPlaceholder =
        (id<MDCTextInputControllerFloatingPlaceholder>)textInputController;
    if (!fontScheme.body1 || !fontScheme.caption || fontScheme.caption.pointSize <= 0) {
      [textInputControllerFloatingPlaceholder setFloatingPlaceholderScaleDefault:0];
    } else {
      textInputControllerFloatingPlaceholder.floatingPlaceholderScale =
          [NSNumber numberWithDouble:fontScheme.caption.pointSize / fontScheme.body1.pointSize];
    }
  }
}

+ (void)applyFontScheme:(id<MDCFontScheme>)fontScheme toTextField:(MDCTextField *)textField {
  textField.font = fontScheme.body1;
  textField.placeholderLabel.font = fontScheme.body1;
  textField.leadingUnderlineLabel.font = fontScheme.caption;
  textField.trailingUnderlineLabel.font = fontScheme.caption;
}

// TODO: (larche) Drop this "#if !defined..." and the pragmas when we drop Xcode 8 support.
// This is to silence a warning that doesn't appear in Xcode 9 when you use Class as an object.
#if !defined(__IPHONE_11_0)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wobjc-method-access"
#endif
+ (void)applyFontScheme:(id<MDCFontScheme>)fontScheme
    toAllTextInputControllersOfClass:(Class<MDCTextInputController>)textInputControllerClass {
  [textInputControllerClass setInlinePlaceholderFontDefault:fontScheme.body1];
  [textInputControllerClass setTrailingUnderlineLabelFontDefault:fontScheme.caption];
  [textInputControllerClass setLeadingUnderlineLabelFontDefault:fontScheme.caption];
  if ([textInputControllerClass
          conformsToProtocol:@protocol(MDCTextInputControllerFloatingPlaceholder)]) {
    Class<MDCTextInputControllerFloatingPlaceholder> textInputControllerFloatingPlaceholderClass =
        (Class<MDCTextInputControllerFloatingPlaceholder>)textInputControllerClass;
    if (!fontScheme.body1 || !fontScheme.caption || fontScheme.caption.pointSize <= 0) {
      [textInputControllerFloatingPlaceholderClass setFloatingPlaceholderScaleDefault:0.75];
    } else {
      CGFloat scale = fontScheme.caption.pointSize / fontScheme.body1.pointSize;
      [textInputControllerFloatingPlaceholderClass setFloatingPlaceholderScaleDefault:scale];
    }
  }
}
#if !defined(__IPHONE_11_0)
#pragma clang diagnostic pop
#endif

@end