This repository has been archived by the owner on Aug 30, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 17
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add new APIs for implicit animations. (#30)
* Add new APIs for implicit animations. * Docs. * Add docs. * Docs. * Cleanup. * Remove strong. * Return copy. * Docs and rework. * Add missing header. * More tests.
- Loading branch information
Showing
6 changed files
with
398 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| /* | ||
| Copyright 2017-present The Material Motion 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 <Foundation/Foundation.h> | ||
| #import <QuartzCore/QuartzCore.h> | ||
|
|
||
| @interface MDMImplicitAction: NSObject | ||
| @property(nonatomic, strong, readonly) id initialValue; | ||
| @property(nonatomic, copy, readonly) NSString *keyPath; | ||
| @property(nonatomic, strong, readonly) CALayer *layer; | ||
| @end | ||
|
|
||
| NSArray<MDMImplicitAction *> *MDMAnimateImplicitly(void (^animations)(void)); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| /* | ||
| Copyright 2017-present The Material Motion 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 "MDMBlockAnimations.h" | ||
|
|
||
| #import <UIKit/UIKit.h> | ||
| #import <objc/runtime.h> | ||
|
|
||
| static IMP sOriginalActionForLayerImp = NULL; | ||
|
|
||
| @interface MDMActionContext: NSObject | ||
| @property(nonatomic, readonly) NSArray<MDMImplicitAction *> *interceptedActions; | ||
| @end | ||
|
|
||
| @implementation MDMImplicitAction | ||
|
|
||
| - (instancetype)initWithLayer:(CALayer *)layer | ||
| keyPath:(NSString *)keyPath | ||
| initialValue:(id)initialValue { | ||
| self = [super init]; | ||
| if (self) { | ||
| _layer = layer; | ||
| _keyPath = [keyPath copy]; | ||
| _initialValue = initialValue; | ||
| } | ||
| return self; | ||
| } | ||
|
|
||
| @end | ||
|
|
||
| @implementation MDMActionContext { | ||
| NSMutableArray<MDMImplicitAction *> *_interceptedActions; | ||
| } | ||
|
|
||
| - (instancetype)init { | ||
| self = [super init]; | ||
| if (self) { | ||
| _interceptedActions = [NSMutableArray array]; | ||
| } | ||
| return self; | ||
| } | ||
|
|
||
| - (void)addActionForLayer:(CALayer *)layer | ||
| keyPath:(NSString *)keyPath | ||
| withInitialValue:(id)initialValue { | ||
| [_interceptedActions addObject:[[MDMImplicitAction alloc] initWithLayer:layer | ||
| keyPath:keyPath | ||
| initialValue:initialValue]]; | ||
| } | ||
|
|
||
| - (NSArray<MDMImplicitAction *> *)interceptedActions { | ||
| return [_interceptedActions copy]; | ||
| } | ||
|
|
||
| @end | ||
|
|
||
| static NSMutableArray *sActionContext = nil; | ||
|
|
||
| static id<CAAction> ActionForLayer(id self, SEL _cmd, CALayer *layer, NSString *event) { | ||
| NSCAssert([NSStringFromSelector(_cmd) isEqualToString: | ||
| NSStringFromSelector(@selector(actionForLayer:forKey:))], | ||
| @"Invalid method signature."); | ||
|
|
||
| MDMActionContext *context = [sActionContext lastObject]; | ||
| NSCAssert(context != nil, @"MotionAnimator action method invoked out of implicit scope."); | ||
|
|
||
| if (context == nil) { | ||
| // Graceful handling of invalid state on non-debug builds for if our context is nil invokes our | ||
| // original implementation: | ||
| return ((id<CAAction>(*)(id, SEL, CALayer *, NSString *))sOriginalActionForLayerImp) | ||
| (self, _cmd, layer, event); | ||
| } | ||
|
|
||
| // We don't have access to the "to" value of our animation here, so we unfortunately can't | ||
| // calculate additive values if the animator is configured as such. So, to support additive | ||
| // animations, we queue up the modified actions and then add them all at the end of our | ||
| // MDMAnimateBlock invocation. | ||
| id initialValue = [layer valueForKeyPath:event]; | ||
| [context addActionForLayer:layer keyPath:event withInitialValue:initialValue]; | ||
| return [NSNull null]; | ||
| } | ||
|
|
||
| NSArray<MDMImplicitAction *> *MDMAnimateImplicitly(void (^work)(void)) { | ||
| if (!work) { | ||
| return nil; | ||
| } | ||
|
|
||
| // This method can be called recursively, so we maintain a recursive context stack in the scope of | ||
| // this method. Note that this is absolutely not thread safe, but neither is Core Animation. | ||
| if (!sActionContext) { | ||
| sActionContext = [NSMutableArray array]; | ||
| } | ||
| [sActionContext addObject:[[MDMActionContext alloc] init]]; | ||
|
|
||
| SEL selector = @selector(actionForLayer:forKey:); | ||
| Method method = class_getInstanceMethod([UIView class], selector); | ||
|
|
||
| if (sOriginalActionForLayerImp == nil) { | ||
| // Swap the original UIView implementation with our own so that we can intercept all | ||
| // actionForLayer:forKey: events. All events will be | ||
| sOriginalActionForLayerImp = method_setImplementation(method, (IMP)ActionForLayer); | ||
| } | ||
|
|
||
| work(); | ||
|
|
||
| // Return any intercepted actions we received during the invocation of work. | ||
| MDMActionContext *context = [sActionContext lastObject]; | ||
| [sActionContext removeLastObject]; | ||
|
|
||
| if ([sActionContext count] == 0) { | ||
| // Restore our original method if we've emptied the stack: | ||
| method_setImplementation(method, sOriginalActionForLayerImp); | ||
|
|
||
| sOriginalActionForLayerImp = nil; | ||
| sActionContext = nil; | ||
| } | ||
|
|
||
| return context.interceptedActions; | ||
| } |
Oops, something went wrong.