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/thread_task_runner_handle.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_(kGridIconDimension, kGridIconDimension),
  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. The transform's origin is this view's origin.
  53   gfx::Transform transform;
  54   transform.Translate(scaled_rect_.x() - bounds().x(),
  55                       scaled_rect_.y() - bounds().y());
  56   transform.Scale(
  57       static_cast<double>(scaled_rect_.width()) / bounds().width(),
  58       static_cast<double>(scaled_rect_.height()) / bounds().height());
  59
  60   if (open_folder_) {
  61     // Transform to a scaled down icon inside the original folder icon.
  62     layer()->SetTransform(transform);
  63   }
  64
  65   // Animate the icon to its target location and scale when opening or
  66   // closing a folder.
  67   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
  68   settings.AddObserver(this);
  69   settings.SetTweenType(gfx::Tween::FAST_OUT_SLOW_IN);
  70   settings.SetTransitionDuration(
  71       base::TimeDelta::FromMilliseconds(kFolderTransitionInDurationMs));
  72   layer()->SetTransform(open_folder_ ? gfx::Transform() : transform);
  73 }
  74
  75 gfx::Size TopIconAnimationView::GetPreferredSize() const {
  76   return icon_size_;
  77 }
  78
  79 void TopIconAnimationView::Layout() {
  80   icon_->SetBoundsRect(GetContentsBounds());
  81 }
  82
  83 void TopIconAnimationView::OnImplicitAnimationsCompleted() {
  84   SetVisible(false);
  85   FOR_EACH_OBSERVER(TopIconAnimationObserver,
  86                     observers_,
  87                     OnTopIconAnimationsComplete());
  88   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
  89 }
  90
  91 bool TopIconAnimationView::RequiresNotificationWhenAnimatorDestroyed() const {
  92   return true;
  93 }
  94
  95 }  // namespace app_list