chrome/browser/ui/cocoa/animatable_view.mm

   1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import <Cocoa/Cocoa.h>
   6 #import <QuartzCore/QuartzCore.h>
   7
   8 #import "chrome/browser/ui/cocoa/animatable_view.h"
   9 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMNSAnimation+Duration.h"
  10
  11 // NSAnimation subclass that animates the height of an AnimatableView.  Allows
  12 // the caller to start and cancel the animation as desired.
  13 @interface HeightAnimation : NSAnimation {
  14  @private
  15   AnimatableView* view_;  // weak, owns us.
  16   CGFloat startHeight_;
  17   CGFloat endHeight_;
  18 }
  19
  20 // Initialize a new height animation for the given view.  The animation will not
  21 // start until startAnimation: is called.
  22 - (id)initWithView:(AnimatableView*)view
  23        finalHeight:(CGFloat)height
  24           duration:(NSTimeInterval)duration;
  25 @end
  26
  27 @implementation HeightAnimation
  28 - (id)initWithView:(AnimatableView*)view
  29        finalHeight:(CGFloat)height
  30           duration:(NSTimeInterval)duration {
  31   if ((self = [super gtm_initWithDuration:duration
  32                                 eventMask:NSLeftMouseUpMask
  33                            animationCurve:NSAnimationEaseIn])) {
  34     view_ = view;
  35     startHeight_ = [view_ height];
  36     endHeight_ = height;
  37     [self setAnimationBlockingMode:NSAnimationNonblocking];
  38     [self setDelegate:view_];
  39   }
  40   return self;
  41 }
  42
  43 // Overridden to call setHeight for each progress tick.
  44 - (void)setCurrentProgress:(NSAnimationProgress)progress {
  45   [super setCurrentProgress:progress];
  46   [view_ setHeight:((progress * (endHeight_ - startHeight_)) + startHeight_)];
  47 }
  48 @end
  49
  50
  51 @implementation AnimatableView
  52 @synthesize delegate = delegate_;
  53 @synthesize resizeDelegate = resizeDelegate_;
  54
  55 - (void)dealloc {
  56   // Stop the animation if it is running, since it holds a pointer to this view.
  57   [self stopAnimation];
  58   [super dealloc];
  59 }
  60
  61 - (CGFloat)height {
  62   return [self frame].size.height;
  63 }
  64
  65 - (void)setHeight:(CGFloat)newHeight {
  66   // Force the height to be an integer because some animations look terrible
  67   // with non-integer intermediate heights.  We only ever set integer heights
  68   // for our views, so this shouldn't be a limitation in practice.
  69   int height = floor(newHeight);
  70   [resizeDelegate_ resizeView:self newHeight:height];
  71 }
  72
  73 - (void)animateToNewHeight:(CGFloat)newHeight
  74                   duration:(NSTimeInterval)duration {
  75   [currentAnimation_ stopAnimation];
  76
  77   currentAnimation_.reset([[HeightAnimation alloc] initWithView:self
  78                                                     finalHeight:newHeight
  79                                                        duration:duration]);
  80   if ([resizeDelegate_ respondsToSelector:@selector(setAnimationInProgress:)])
  81     [resizeDelegate_ setAnimationInProgress:YES];
  82   [currentAnimation_ startAnimation];
  83 }
  84
  85 - (void)stopAnimation {
  86   [currentAnimation_ stopAnimation];
  87 }
  88
  89 - (NSAnimationProgress)currentAnimationProgress {
  90   return [currentAnimation_ currentProgress];
  91 }
  92
  93 - (void)animationDidStop:(NSAnimation*)animation {
  94   if ([resizeDelegate_ respondsToSelector:@selector(setAnimationInProgress:)])
  95     [resizeDelegate_ setAnimationInProgress:NO];
  96   if ([delegate_ respondsToSelector:@selector(animationDidStop:)])
  97     [delegate_ animationDidStop:animation];
  98   currentAnimation_.reset(nil);
  99 }
 100
 101 - (void)animationDidEnd:(NSAnimation*)animation {
 102   if ([resizeDelegate_ respondsToSelector:@selector(setAnimationInProgress:)])
 103     [resizeDelegate_ setAnimationInProgress:NO];
 104   if ([delegate_ respondsToSelector:@selector(animationDidEnd:)])
 105     [delegate_ animationDidEnd:animation];
 106   currentAnimation_.reset(nil);
 107 }
 108
 109 @end