| // 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 <UIKit/UIKit.h> |
| |
| /** |
| This protocol allows child view controllers to tell parent view controllers that conform to this |
| protocol that they would like their content size categories changed. The methods accept buttons so |
| that the parent can disable the appropriate button when either the smallest or largest content size |
| category is adopted. |
| */ |
| @protocol MDCTraitEnvironmentChangeDelegate |
| - (void) |
| childViewControllerDidRequestPreferredContentSizeCategoryDecrement: |
| (UIViewController *)childViewController |
| decreaseButton:(UIButton *)decreaseButton |
| increaseButton:(UIButton *)increaseButton; |
| - (void) |
| childViewControllerDidRequestPreferredContentSizeCategoryIncrement: |
| (UIViewController *)childViewController |
| decreaseButton:(UIButton *)decreaseButton |
| increaseButton:(UIButton *)increaseButton; |
| |
| - (void)childViewControllerDidRequestUserInterfaceStyle:(UIViewController *)childViewController |
| userInterfaceStyle:(UIUserInterfaceStyle)userInterfaceStyle |
| API_AVAILABLE(ios(12.0)); |
| |
| - (void)childViewControllerDidRequestLayoutDirection:(UIViewController *)childViewController |
| layoutDirection: |
| (UITraitEnvironmentLayoutDirection)layoutDirection |
| API_AVAILABLE(ios(10.0)); |
| |
| @end |
