src/ui/app_list/views/top_icon_animation_view.cc

   1 // Copyright 2014 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 #include "ui/app_list/views/top_icon_animation_view.h"
   6
   7 #include "base/message_loop/message_loop_proxy.h"
   8 #include "ui/app_list/app_list_constants.h"
   9 #include "ui/compositor/scoped_layer_animation_settings.h"
  10 #include "ui/gfx/image/image_skia_operations.h"
  11 #include "ui/views/controls/image_view.h"
  12
  13 namespace app_list {
  14
  15 TopIconAnimationView::TopIconAnimationView(const gfx::ImageSkia& icon,
  16                                            const gfx::Rect& scaled_rect,
  17                                            bool open_folder)
  18     : icon_size_(kPreferredIconDimension, kPreferredIconDimension),
  19       icon_(new views::ImageView),
  20       scaled_rect_(scaled_rect),
  21       open_folder_(open_folder) {
  22   DCHECK(!icon.isNull());
  23   gfx::ImageSkia resized(gfx::ImageSkiaOperations::CreateResizedImage(
  24       icon,
  25       skia::ImageOperations::RESIZE_BEST, icon_size_));
  26   icon_->SetImage(resized);
  27   AddChildView(icon_);
  28
  29   SetPaintToLayer(true);
  30   SetFillsBoundsOpaquely(false);
  31 }
  32
  33 TopIconAnimationView::~TopIconAnimationView() {
  34   // Required due to RequiresNotificationWhenAnimatorDestroyed() returning true.
  35   // See ui::LayerAnimationObserver for details.
  36   StopObservingImplicitAnimations();
  37 }
  38
  39 void TopIconAnimationView::AddObserver(TopIconAnimationObserver* observer) {
  40   observers_.AddObserver(observer);
  41 }
  42
  43 void TopIconAnimationView::RemoveObserver(TopIconAnimationObserver* observer) {
  44   observers_.RemoveObserver(observer);
  45 }
  46
  47 void TopIconAnimationView::TransformView() {
  48   // This view will delete itself on animation completion.
  49   set_owned_by_client();
  50
  51   // Transform used for scaling down the icon and move it back inside to the
  52   // original folder icon.
  53   const float kIconTransformScale = 0.33333f;
  54   gfx::Transform transform;
  55   transform.Translate(scaled_rect_.x() - layer()->bounds().x(),
  56                       scaled_rect_.y() - layer()->bounds().y());
  57   transform.Scale(kIconTransformScale, kIconTransformScale);
  58
  59   if (open_folder_) {
  60     // Transform to a scaled down icon inside the original folder icon.
  61     layer()->SetTransform(transform);
  62   }
  63
  64   // Animate the icon to its target location and scale when opening or
  65   // closing a folder.
  66   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
  67   settings.AddObserver(this);
  68   settings.SetTweenType(gfx::Tween::FAST_OUT_SLOW_IN);
  69   settings.SetTransitionDuration(
  70       base::TimeDelta::FromMilliseconds(kFolderTransitionInDurationMs));
  71   layer()->SetTransform(open_folder_ ? gfx::Transform() : transform);
  72 }
  73
  74 gfx::Size TopIconAnimationView::GetPreferredSize() const {
  75   return icon_size_;
  76 }
  77
  78 void TopIconAnimationView::Layout() {
  79   icon_->SetBoundsRect(GetContentsBounds());
  80 }
  81
  82 void TopIconAnimationView::OnImplicitAnimationsCompleted() {
  83   SetVisible(false);
  84   FOR_EACH_OBSERVER(TopIconAnimationObserver,
  85                     observers_,
  86                     OnTopIconAnimationsComplete());
  87   base::MessageLoopProxy::current()->DeleteSoon(FROM_HERE, this);
  88 }
  89
  90 bool TopIconAnimationView::RequiresNotificationWhenAnimatorDestroyed() const {
  91   return true;
  92 }
  93
  94 }  // namespace app_list