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      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/folder_background_view.h"
      6 
      7 #include "ui/app_list/app_list_constants.h"
      8 #include "ui/app_list/views/app_list_folder_view.h"
      9 #include "ui/app_list/views/apps_container_view.h"
     10 #include "ui/compositor/scoped_layer_animation_settings.h"
     11 #include "ui/gfx/canvas.h"
     12 #include "ui/gfx/transform_util.h"
     13 
     14 namespace app_list {
     15 
     16 namespace {
     17 
     18 const float kFolderInkBubbleScale = 1.2f;
     19 const int kBubbleTransitionDurationMs = 200;
     20 
     21 }  // namespace
     22 
     23 FolderBackgroundView::FolderBackgroundView()
     24     : folder_view_(NULL),
     25       show_state_(NO_BUBBLE) {
     26   SetPaintToLayer(true);
     27   SetFillsBoundsOpaquely(false);
     28 }
     29 
     30 FolderBackgroundView::~FolderBackgroundView() {
     31 }
     32 
     33 void FolderBackgroundView::UpdateFolderContainerBubble(ShowState state) {
     34   if (show_state_ == state ||
     35       (state == HIDE_BUBBLE && show_state_ == NO_BUBBLE)) {
     36     return;
     37   }
     38 
     39   show_state_ = state;
     40 
     41   // Set the initial state before the animation starts.
     42   const gfx::Rect bounds(layer()->bounds().size());
     43   gfx::Transform transform =
     44       gfx::GetScaleTransform(bounds.CenterPoint(), kFolderInkBubbleScale);
     45   if (show_state_ == SHOW_BUBBLE) {
     46     layer()->SetOpacity(0.0f);
     47     layer()->SetTransform(transform);
     48   } else {
     49     layer()->SetOpacity(1.0f);
     50     layer()->SetTransform(gfx::Transform());
     51   }
     52 
     53   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
     54   settings.AddObserver(this);
     55   settings.SetTransitionDuration(
     56       base::TimeDelta::FromMilliseconds((kBubbleTransitionDurationMs)));
     57   if (show_state_ == SHOW_BUBBLE) {
     58     settings.SetTweenType(gfx::Tween::LINEAR_OUT_SLOW_IN);
     59     layer()->SetOpacity(1.0f);
     60     layer()->SetTransform(gfx::Transform());
     61   } else {
     62     settings.SetTweenType(gfx::Tween::FAST_OUT_LINEAR_IN);
     63     layer()->SetOpacity(0.0f);
     64     layer()->SetTransform(transform);
     65   }
     66 
     67   SchedulePaint();
     68 }
     69 
     70 int FolderBackgroundView::GetFolderContainerBubbleRadius() const {
     71   return std::max(GetContentsBounds().width(), GetContentsBounds().height()) /
     72          2;
     73 }
     74 
     75 void FolderBackgroundView::OnPaint(gfx::Canvas* canvas) {
     76   if (show_state_ == NO_BUBBLE)
     77     return;
     78 
     79   // Draw ink bubble that shows the folder boundary.
     80   SkPaint paint;
     81   paint.setStyle(SkPaint::kFill_Style);
     82   paint.setAntiAlias(true);
     83   paint.setColor(kFolderBubbleColor);
     84   canvas->DrawCircle(GetContentsBounds().CenterPoint(),
     85                      GetFolderContainerBubbleRadius(),
     86                      paint);
     87 }
     88 
     89 void FolderBackgroundView::OnImplicitAnimationsCompleted() {
     90   // Show folder name after the ink bubble disappears.
     91   if (show_state_ == HIDE_BUBBLE) {
     92     static_cast<AppsContainerView*>(parent())->app_list_folder_view()->
     93         UpdateFolderNameVisibility(true);
     94   }
     95 }
     96 
     97 }  // namespace app_list
     98