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