src/ui/app_list/views/folder_background_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/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