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