Upstream iOS UI utilities.

ios/chrome/browser/ui/animation_util.mm

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/chrome/browser/ui/animation_util.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include "ios/chrome/browser/ui/reversed_animation.h"
+
+CAAnimation* FrameAnimationMake(CALayer* layer,
+                                CGRect beginFrame,
+                                CGRect endFrame) {
+  CGRect beginBounds = {CGPointZero, beginFrame.size};
+  CGRect endBounds = {CGPointZero, endFrame.size};
+  CABasicAnimation* boundsAnimation =
+      [CABasicAnimation animationWithKeyPath:@"bounds"];
+  boundsAnimation.fromValue = [NSValue valueWithCGRect:beginBounds];
+  boundsAnimation.toValue = [NSValue valueWithCGRect:endBounds];
+  boundsAnimation.removedOnCompletion = NO;
+  boundsAnimation.fillMode = kCAFillModeBoth;
+  CGPoint beginPosition = CGPointMake(
+      beginFrame.origin.x + layer.anchorPoint.x * beginBounds.size.width,
+      beginFrame.origin.y + layer.anchorPoint.y * beginBounds.size.height);
+  CGPoint endPosition = CGPointMake(
+      endFrame.origin.x + layer.anchorPoint.x * endBounds.size.width,
+      endFrame.origin.y + layer.anchorPoint.y * endBounds.size.height);
+  CABasicAnimation* positionAnimation =
+      [CABasicAnimation animationWithKeyPath:@"position"];
+  positionAnimation.fromValue = [NSValue valueWithCGPoint:beginPosition];
+  positionAnimation.toValue = [NSValue valueWithCGPoint:endPosition];
+  positionAnimation.removedOnCompletion = NO;
+  positionAnimation.fillMode = kCAFillModeBoth;
+  return AnimationGroupMake(@[ boundsAnimation, positionAnimation ]);
+}
+
+CAAnimation* OpacityAnimationMake(CGFloat beginOpacity, CGFloat endOpacity) {
+  CABasicAnimation* opacityAnimation =
+      [CABasicAnimation animationWithKeyPath:@"opacity"];
+  opacityAnimation.fromValue = @(beginOpacity);
+  opacityAnimation.toValue = @(endOpacity);
+  opacityAnimation.fillMode = kCAFillModeBoth;
+  opacityAnimation.removedOnCompletion = NO;
+  return opacityAnimation;
+}
+
+CAAnimation* AnimationGroupMake(NSArray* animations) {
+  CAAnimationGroup* animationGroup = [CAAnimationGroup animation];
+  animationGroup.animations = animations;
+  CFTimeInterval duration = 0.0;
+  for (CAAnimation* animation in animations)
+    duration = std::max(duration, animation.beginTime + animation.duration);
+  animationGroup.duration = duration;
+  animationGroup.fillMode = kCAFillModeBoth;
+  animationGroup.removedOnCompletion = NO;
+  return animationGroup;
+}
+
+CAAnimation* DelayedAnimationMake(CAAnimation* animation,
+                                  CFTimeInterval delay) {
+  CAAnimation* delayedAnimation = [[animation copy] autorelease];
+  if (delayedAnimation) {
+    delayedAnimation.beginTime = delay;
+    delayedAnimation = AnimationGroupMake(@[ delayedAnimation ]);
+  }
+  return delayedAnimation;
+}
+
+CABasicAnimation* FindAnimationForKeyPath(NSString* keyPath,
+                                          CAAnimation* animation) {
+  __block CABasicAnimation* animationForKeyPath = nil;
+  if ([animation isKindOfClass:[CABasicAnimation class]]) {
+    CABasicAnimation* basicAnimation =
+        static_cast<CABasicAnimation*>(animation);
+    if ([basicAnimation.keyPath isEqualToString:keyPath])
+      animationForKeyPath = basicAnimation;
+  } else if ([animation isKindOfClass:[CAAnimationGroup class]]) {
+    CAAnimationGroup* animationGroup =
+        static_cast<CAAnimationGroup*>(animation);
+    [animationGroup.animations
+        enumerateObjectsUsingBlock:^(CAAnimation* subAnimation, NSUInteger idx,
+                                     BOOL* stop) {
+          animationForKeyPath = FindAnimationForKeyPath(keyPath, subAnimation);
+          *stop = animationForKeyPath != nil;
+        }];
+  }
+  return animationForKeyPath;
+}
+
+void RemoveAnimationForKeyFromLayers(NSString* key, NSArray* layers) {
+  for (CALayer* layer in layers)
+    [layer removeAnimationForKey:key];
+}