Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/common/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/common/material_design/material_design_controller.h"
+#include "ash/common/shelf/shelf_background_animator.h"
+#include "ash/common/shelf/shelf_background_animator_observer.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm/window_animation_types.h"
 #include "ash/common/wm/window_parenting_utils.h"
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_lookup.h"
@@ skipping 23 matching lines @@
 // static
 const int DockedWindowLayoutManager::kMinDockGap = 2;
 // static
 const int DockedWindowLayoutManager::kIdealWidth = 250;
 const int kMinimumHeight = 250;
 const int kSlideDurationMs = 120;
 const int kFadeDurationMs = 60;
 const int kMinimizeDurationMs = 720;
 
 class DockedBackgroundWidget : public views::Widget,
-                               public BackgroundAnimatorDelegate,
-                               public WmShelfObserver {
+                               public WmShelfObserver,
+                               public ShelfBackgroundAnimatorObserver {
  public:
   explicit DockedBackgroundWidget(DockedWindowLayoutManager* manager)
       : manager_(manager),
         alignment_(DOCKED_ALIGNMENT_NONE),
-        background_animator_(this, 0, GetShelfConstant(SHELF_BACKGROUND_ALPHA)),
-        alpha_(0),
+        background_animator_(SHELF_BACKGROUND_DEFAULT, nullptr),
+        asset_background_alpha_(0),
         opaque_background_(ui::LAYER_SOLID_COLOR),
         visible_background_type_(manager_->shelf()->GetBackgroundType()),
         visible_background_change_type_(BACKGROUND_CHANGE_IMMEDIATE) {
     manager_->shelf()->AddObserver(this);
     InitWidget(manager_->dock_container());
+
+    background_animator_.AddObserver(this);
   }
 
   ~DockedBackgroundWidget() override {
+    background_animator_.RemoveObserver(this);
     manager_->shelf()->RemoveObserver(this);
   }
 
   // Sets widget bounds and sizes opaque background layer to fill the widget.
   void SetBackgroundBounds(const gfx::Rect& bounds, DockedAlignment alignment) {
     SetBounds(bounds);
     opaque_background_.SetBounds(gfx::Rect(bounds.size()));
     alignment_ = alignment;
   }
 
  private:
   // views::Widget:
   void OnNativeWidgetVisibilityChanged(bool visible) override {
     views::Widget::OnNativeWidgetVisibilityChanged(visible);
     UpdateBackground();
   }
 
   void OnNativeWidgetPaint(const ui::PaintContext& context) override {
     gfx::Rect local_window_bounds(GetWindowBoundsInScreen().size());
     ui::PaintRecorder recorder(context, local_window_bounds.size());
 
-    if (MaterialDesignController::IsShelfMaterial()) {
-      recorder.canvas()->FillRect(local_window_bounds,
-                                  SkColorSetA(kShelfBaseColor, alpha_));
-    } else {
+    if (!MaterialDesignController::IsShelfMaterial()) {
       const gfx::ImageSkia& shelf_background(alignment_ == DOCKED_ALIGNMENT_LEFT
                                                  ? shelf_background_left_
                                                  : shelf_background_right_);
       SkPaint paint;
-      paint.setAlpha(alpha_);
+      paint.setAlpha(asset_background_alpha_);
       recorder.canvas()->DrawImageInt(
           shelf_background, 0, 0, shelf_background.width(),
           shelf_background.height(),
           alignment_ == DOCKED_ALIGNMENT_LEFT
               ? local_window_bounds.width() - shelf_background.width()
               : 0,
           0, shelf_background.width(), local_window_bounds.height(), false,
           paint);
       recorder.canvas()->DrawImageInt(
           shelf_background,
           alignment_ == DOCKED_ALIGNMENT_LEFT ? 0
                                               : shelf_background.width() - 1,
           0, 1, shelf_background.height(),
           alignment_ == DOCKED_ALIGNMENT_LEFT ? 0 : shelf_background.width(), 0,
           local_window_bounds.width() - shelf_background.width(),
           local_window_bounds.height(), false, paint);
     }
   }
 
-  // BackgroundAnimatorDelegate:
-  void UpdateBackground(int alpha) override {
-    alpha_ = alpha;
+  // ShelfBackgroundAnimatorObserver:
+  void UpdateShelfOpaqueBackground(int alpha) override {
+    const float kMaxAlpha = 255.0f;
+    opaque_background_.SetOpacity(alpha / kMaxAlpha);
+  }
+
+  void UpdateShelfAssetBackground(int alpha) override {
+    asset_background_alpha_ = alpha;
     SchedulePaintInRect(gfx::Rect(GetWindowBoundsInScreen().size()));
   }
 
-  // ShelfLayoutManagerObserver:
-  void OnBackgroundUpdated(ShelfBackgroundType background_type,
-                           BackgroundAnimatorChangeType change_type) override {
+  // WmShelfObserver:
+  void OnBackgroundTypeChanged(
+      ShelfBackgroundType background_type,
+      BackgroundAnimatorChangeType change_type) override {
     // Sets the background type. Starts an animation to transition to
     // |background_type| if the widget is visible. If the widget is not visible,
     // the animation is postponed till the widget becomes visible.
     visible_background_type_ = background_type;
     visible_background_change_type_ = change_type;
     if (IsVisible())
       UpdateBackground();
   }
 
   void InitWidget(WmWindow* parent) {
@@ skipping 33 matching lines @@
   }
 
   // Transitions to |visible_background_type_| if the widget is visible and to
   // SHELF_BACKGROUND_DEFAULT if it is not.
   void UpdateBackground() {
     ShelfBackgroundType background_type =
         IsVisible() ? visible_background_type_ : SHELF_BACKGROUND_DEFAULT;
     BackgroundAnimatorChangeType change_type =
         IsVisible() ? visible_background_change_type_
                     : BACKGROUND_CHANGE_IMMEDIATE;
-
-    float target_opacity =
-        (background_type == SHELF_BACKGROUND_MAXIMIZED) ? 1.0f : 0.0f;
-    std::unique_ptr<ui::ScopedLayerAnimationSettings>
-        opaque_background_animation;
-    if (change_type != BACKGROUND_CHANGE_IMMEDIATE) {
-      opaque_background_animation.reset(new ui::ScopedLayerAnimationSettings(
-          opaque_background_.GetAnimator()));
-      opaque_background_animation->SetTransitionDuration(
-          base::TimeDelta::FromMilliseconds(kTimeToSwitchBackgroundMs));
-    }
-    opaque_background_.SetOpacity(target_opacity);
-
-    // TODO(varkha): use ui::Layer on both opaque_background and normal
-    // background retire background_animator_ at all. It would be simpler.
-    // See also ShelfWidget::SetPaintsBackground.
-    background_animator_.SetPaintsBackground(
-        background_type != SHELF_BACKGROUND_DEFAULT, change_type);
+    background_animator_.PaintBackground(background_type, change_type);
     SchedulePaintInRect(gfx::Rect(GetWindowBoundsInScreen().size()));
   }
 
   DockedWindowLayoutManager* manager_;
 
   DockedAlignment alignment_;
 
   // The animator for the background transitions.
-  BackgroundAnimator background_animator_;
+  ShelfBackgroundAnimator background_animator_;
 
   // The alpha to use for drawing image assets covering the docked background.
-  int alpha_;
+  int asset_background_alpha_;
 
+  // TODO(bruthig): Remove opaque_background_ (see https://crbug.com/621551).
   // Solid black background that can be made fully opaque.
   ui::Layer opaque_background_;
 
   // Backgrounds created from shelf background by 90 or 270 degree rotation.
   // TODO(tdanderson): These members can be removed once the material design
   // shelf is enabled by default. See crbug.com/614453.
   gfx::ImageSkia shelf_background_left_;
   gfx::ImageSkia shelf_background_right_;
 
   // The background type to use when the widget is visible. When not visible,
@@ skipping 1153 matching lines @@
 
 void DockedWindowLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 }  // namespace ash