| // 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 <CoreGraphics/CoreGraphics.h> |
| #import <UIKit/UIKit.h> |
| |
| /** |
| Allows elevation changes to propagate down the view hierarchy and allows objects conforming to |
| @c MDCElevatable to react to those changes accordingly. |
| */ |
| @interface UIView (MaterialElevationResponding) |
| |
| /** |
| Returns the sum of all @c mdc_currentElevation of the superviews going up the view hierarchy |
| recursively. |
| |
| If a view in the hierarchy conforms to @c MDCElevationOveriding and @c mdc_overrideBaseElevation |
| is non-negative, then the sum of the current total plus the value of @c mdc_overrideBaseElevation |
| is returned. |
| |
| If a @c UIViewController conforms to @c MDCElevatable or @c MDCElevationOveriding then its @c view |
| will report the view controllers base elevation. |
| */ |
| @property(nonatomic, assign, readonly) CGFloat mdc_baseElevation; |
| |
| /** |
| Returns the sum of the view's @c mdc_currentElevation with the @c mdc_currentElevation of its |
| superviews going up the view hierarchy recursively. |
| |
| This value is effectively the sum of @c mdc_baseElevation and @c mdc_currentElevation. |
| */ |
| @property(nonatomic, assign, readonly) CGFloat mdc_absoluteElevation; |
| |
| /** |
| Should be called when the view's @c mdc_currentElevation has changed. Will be called on the |
| receiver's @c subviews. |
| |
| If a @c UIView views conform to @c MDCElevation then @c mdc_elevationDidChangeBlock: is called. |
| */ |
| - (void)mdc_elevationDidChange; |
| |
| @end |
