Animate window control changes in TouchView

ash/frame/caption_buttons/frame_caption_button_container_view.cc

Index: ash/frame/caption_buttons/frame_caption_button_container_view.cc
diff --git a/ash/frame/caption_buttons/frame_caption_button_container_view.cc b/ash/frame/caption_buttons/frame_caption_button_container_view.cc
index 06103f46bd77d6fef7711c8dd5c33ea8e01d93f7..d5c4f801790b4cd6e672996439c7d9ac72dd03e6 100644
--- a/ash/frame/caption_buttons/frame_caption_button_container_view.cc
+++ b/ash/frame/caption_buttons/frame_caption_button_container_view.cc
@@ -5,6 +5,7 @@
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 
 #include <cmath>
+#include <map>
 
 #include "ash/ash_switches.h"
 #include "ash/frame/caption_buttons/frame_caption_button.h"
@@ -14,7 +15,10 @@
 #include "grit/ui_strings.h"  // Accessibility names
 #include "ui/base/hit_test.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/gfx/animation/tween.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/point.h"
@@ -25,6 +29,14 @@ namespace ash {
 
 namespace {
 
+// Visual design parameters for animating the transition to maximize mode.
+// When the size button hides we delay sliding the minimize button into its
+// location. Also used to delay showing the size button so that the minimize
+// button slides out of that position.
+const int kAnimationDelayMs = 100;
+const int kMinimizeSlideDurationMs = 500;
+const int kSizeFadeDurationMs = 250;
+
 // Converts |point| from |src| to |dst| and hittests against |dst|.
 bool ConvertPointToViewAndHitTest(const views::View* src,
                                   const views::View* dst,
@@ -47,22 +59,32 @@ FrameCaptionButtonContainerView::FrameCaptionButtonContainerView(
       minimize_button_(NULL),
       size_button_(NULL),
       close_button_(NULL) {
+  SetPaintToLayer(true);
+  SetFillsBoundsOpaquely(false);
+
   // Insert the buttons left to right.
   minimize_button_ = new FrameCaptionButton(this, CAPTION_BUTTON_ICON_MINIMIZE);
   minimize_button_->SetAccessibleName(
       l10n_util::GetStringUTF16(IDS_APP_ACCNAME_MINIMIZE));
   minimize_button_->SetVisible(minimize_allowed == MINIMIZE_ALLOWED);
+  minimize_button_->SetPaintToLayer(true);
+  minimize_button_->SetFillsBoundsOpaquely(false);
+
   AddChildView(minimize_button_);
 
   size_button_ = new FrameSizeButton(this, frame, this);
   size_button_->SetAccessibleName(
       l10n_util::GetStringUTF16(IDS_APP_ACCNAME_MAXIMIZE));
+  size_button_->SetPaintToLayer(true);
+  size_button_->SetFillsBoundsOpaquely(false);
   UpdateSizeButtonVisibility(false);
   AddChildView(size_button_);
 
   close_button_ = new FrameCaptionButton(this, CAPTION_BUTTON_ICON_CLOSE);
   close_button_->SetAccessibleName(
       l10n_util::GetStringUTF16(IDS_APP_ACCNAME_CLOSE));
+  close_button_->SetPaintToLayer(true);
+  close_button_->SetFillsBoundsOpaquely(false);
   AddChildView(close_button_);
 }
 
@@ -127,8 +149,48 @@ void FrameCaptionButtonContainerView::UpdateSizeButtonVisibility(
   // time when ShellObserver::OnMaximizeModeStarted is called. This prevents
   // this method from performing that check, and instead relies on the calling
   // code to tell it to force being hidden.
-  size_button_->SetVisible(
-      !force_hidden && frame_->widget_delegate()->CanMaximize());
+
+  bool visible = !force_hidden && frame_->widget_delegate()->CanMaximize();
+
+  // Turning visibility off prevents animations from rendering. Setting the
+  // size button visibility to false will occur after the animation.
+  if (visible) {
+    size_button_->SetVisible(visible);
+    // If SetVisible(true) is called while animating to not visible, then
+    // views::View::SetVisible(true) is a no-op. When the previous animation
+    // ends layer->SetVisible(false) is called. To prevent this
+    // layer->SetVisible(true) immediately interrupts the  animation of this
+    // property, and keeps the layer visible.

[flackr, 2014/05/23 15:17:26]

I would just say,
Because we delay calling View::SetVisible(false) until the end of the animation,
if SetVisible(true) is called mid-animation, the View still believes it is
visible and will not update the target layer visibility.

[jonross, 2014/05/23 17:08:57]

Done.

+    size_button_->layer()->SetVisible(true);
+  }
+
+  ui::ScopedLayerAnimationSettings settings(
+      size_button_->layer()->GetAnimator());
+  settings.SetTransitionDuration(
+      base::TimeDelta::FromMilliseconds(kSizeFadeDurationMs));
+  settings.SetPreemptionStrategy(
+      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+
+  if (visible) {
+    settings.SetTweenType(gfx::Tween::EASE_OUT);
+    // Delay fade in so that the minimize button has begun its sliding
+    // animation.
+    size_button_->layer()->GetAnimator()->SchedulePauseForProperties(
+        base::TimeDelta::FromMilliseconds(kAnimationDelayMs),
+        ui::LayerAnimationElement::OPACITY);
+    size_button_->layer()->SetOpacity(1.0f);
+  } else {
+    settings.SetTweenType(gfx::Tween::EASE_IN);
+    // Observer will call size_button_->SetVisible(false) upon completion of
+    // the animation.
+    // TODO(jonross): avoid the delayed SetVisible(false) call by acquring
+    // the size_button's layer before making it invisible. That layer can then
+    // be animated and deleted upon completion of the animation. See
+    // LayerOwner::RecreateLayer
+    settings.AddObserver(this);
+    size_button_->layer()->SetOpacity(0.0f);
+    size_button_->layer()->SetVisible(false);
+  }
 }
 
 gfx::Size FrameCaptionButtonContainerView::GetPreferredSize() {
@@ -142,15 +204,56 @@ gfx::Size FrameCaptionButtonContainerView::GetPreferredSize() {
 }
 
 void FrameCaptionButtonContainerView::Layout() {
-  int x = 0;
-  for (int i = 0; i < child_count(); ++i) {
+  int x = width();
+  // Offsets the initial position of a child, so that buttons slide into the
+  // place as other buttons are added/removed.
+  int offset_x = 0;
+  for (int i = child_count() - 1; i >= 0; --i) {
     views::View* child = child_at(i);
-    if (!child->visible())
+    ui::LayerAnimator* child_animator = child->layer()->GetAnimator();
+    bool child_animating = child_animator->is_animating();
+    // The actual property visibility is not being animated, otherwise the
+    // view does not render.
+    bool child_animating_opacity = child_animator->
+        IsAnimatingProperty(ui::LayerAnimationElement::OPACITY);
+    bool child_target_visibility = child->layer()->GetTargetVisibility();
+
+    if (child_animating_opacity) {
+      if (child_target_visibility)
+        offset_x += child->width();
+      else
+        offset_x -= child->width();
+    }
+
+    if (!child->visible() || !child_target_visibility)
       continue;
 
+    scoped_ptr<ui::ScopedLayerAnimationSettings> animation;
     gfx::Size size = child->GetPreferredSize();
+    x -= size.width();
+
+    // Animate the button if a previous button is currently animating
+    // its visibility.
+    if (offset_x != 0) {
+      if (!child_animating)
+        child->SetBounds(x + offset_x, 0, size.width(), size.height());
+      if (offset_x < 0) {
+        // Delay sliding to where the previous button was located.
+        child_animator->SchedulePauseForProperties(
+            base::TimeDelta::FromMilliseconds(kAnimationDelayMs),
+            ui::LayerAnimationElement::BOUNDS);
+      }
+
+      ui::ScopedLayerAnimationSettings* settings =
+          new ui::ScopedLayerAnimationSettings(child_animator);
+      settings->SetTransitionDuration(
+          base::TimeDelta::FromMilliseconds(kMinimizeSlideDurationMs));
+      settings->SetPreemptionStrategy(
+          ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+      settings->SetTweenType(gfx::Tween::EASE_OUT);
+      animation.reset(settings);
+    }
     child->SetBounds(x, 0, size.width(), size.height());
-    x += size.width();
   }
 }
 
@@ -202,7 +305,7 @@ void FrameCaptionButtonContainerView::ButtonPressed(views::Button* sender,
   if (sender == minimize_button_) {
     frame_->Minimize();
   } else if (sender == size_button_) {
-    if (frame_->IsFullscreen()) { // Can be clicked in immersive fullscreen.
+    if (frame_->IsFullscreen()) {  // Can be clicked in immersive fullscreen.
       frame_->SetFullscreen(false);
       action = ash::UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_EXIT_FULLSCREEN;
     } else if (frame_->IsMaximized()) {
@@ -212,7 +315,7 @@ void FrameCaptionButtonContainerView::ButtonPressed(views::Button* sender,
       frame_->Maximize();
       action = ash::UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MAXIMIZE;
     }
-  } else if(sender == close_button_) {
+  } else if (sender == close_button_) {
     frame_->Close();
     action = ash::UMA_WINDOW_CLOSE_BUTTON_CLICK;
   } else {
@@ -289,6 +392,23 @@ void FrameCaptionButtonContainerView::SetHoveredAndPressedButtons(
   }
 }
 
+void FrameCaptionButtonContainerView::OnImplicitAnimationsCompleted() {
+  // If there is another animation in the queue, the reverse animation was
+  // triggered before the completion of animating to invisible. Do not turn off
+  // the visibility so that the next animation may render.
+  if (!size_button_->layer()->GetAnimator()->is_animating() &&
+      !size_button_->layer()->GetTargetVisibility())

[flackr, 2014/05/23 15:17:26]

nit: multiline if condition needs braces { }.

[jonross, 2014/05/23 17:08:57]

Done.

+    size_button_->SetVisible(false);
+  // TODO(jonross): currently we need to delay telling the parent about the
+  // size change from visibility. When the size changes this forces a relayout
+  // and we want to animate both the bounds of FrameCaptionButtonContainerView
+  // along with that of its children. However when the parent is currently
+  // having its bounds changed this leads to strange animations where this view
+  // renders outside of its parents. Create a more specific animation where
+  // height and y are immediately fixed, and where we only animate width and x.
+  PreferredSizeChanged();
+}
+
 FrameCaptionButtonContainerView::ButtonIconIds::ButtonIconIds()
     : icon_image_id(-1),
       inactive_icon_image_id(-1),