chromeos: Sync animation.

ash/launcher/app_placeholder_view.cc

+// Copyright (c) 2012 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/launcher/app_placeholder_view.h"
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_animator.h"
+#include "ui/compositor/layer_animation_element.h"
+#include "ui/compositor/layer_animation_sequence.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/transform_util.h"
+
+namespace ash {
+namespace internal {
+
+namespace {
+
+const int kIconSize = 28;
+const SkColor kIconColor = SkColorSetARGB(204, 255, 255, 255);
+
+const int kAnimationDurationInMs = 600;
+const float kAnimationOpacity[] = { 0.4f, 0.8f, 0.4f };
+const float kAnimationScale[] = { 0.8f, 1.0f, 0.8f };
+
+// Delay in milliseconds to start pulse animation.
+int g_animation_start_delay = 0;

[sky, 2012/08/14 20:02:34]

This isn't really a global, I think it should be animation_start_delay.

[xiyuan, 2012/08/15 18:23:27]

Done.

+
+}  // namespace
+
+AppPlaceholderView::AppPlaceholderView() {
+  animation_delay_timer_.Start(
+      FROM_HERE,
+      base::TimeDelta::FromMilliseconds(g_animation_start_delay),
+      this, &AppPlaceholderView::ScheduleAnimation);
+  g_animation_start_delay += kAnimationDurationInMs / 2;

[sky, 2012/08/14 20:02:34]

This seems arbitrary. Shouldn't it be based on when parented?

[xiyuan, 2012/08/15 18:23:27]

Done.

+}
+
+AppPlaceholderView::~AppPlaceholderView() {
+}
+
+void AppPlaceholderView::ScheduleAnimation() {
+  // The two animation set should have the same size.
+  DCHECK(arraysize(kAnimationOpacity) == arraysize(kAnimationScale));

[sky, 2012/08/14 20:02:34]

DCHECK_EQ

[xiyuan, 2012/08/15 18:23:27]

Done.

+
+  ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
+  settings.SetTransitionDuration(
+      base::TimeDelta::FromMilliseconds(kAnimationDurationInMs));
+  layer()->SetOpacity(kAnimationOpacity[0]);
+  layer()->SetTransform(
+      ui::GetScaleTransform(GetLocalBounds().CenterPoint(),
+                            kAnimationScale[0]));
+
+  scoped_ptr<ui::LayerAnimationSequence> opacity_sequence(
+      new ui::LayerAnimationSequence());
+  scoped_ptr<ui::LayerAnimationSequence> transform_sequence(
+      new ui::LayerAnimationSequence());
+
+  // The animations loop infinitely.
+  opacity_sequence->set_is_cyclic(true);
+  transform_sequence->set_is_cyclic(true);
+
+  for (size_t i = 0; i < arraysize(kAnimationOpacity); ++i) {
+    opacity_sequence->AddElement(
+        ui::LayerAnimationElement::CreateOpacityElement(
+            kAnimationOpacity[i],
+            base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
+    transform_sequence->AddElement(
+        ui::LayerAnimationElement::CreateTransformElement(
+            ui::GetScaleTransform(GetLocalBounds().CenterPoint(),
+                                  kAnimationScale[i]),
+            base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
+  }
+
+  ui::LayerAnimationElement::AnimatableProperties opacity_properties;
+  opacity_properties.insert(ui::LayerAnimationElement::OPACITY);
+  opacity_sequence->AddElement(
+      ui::LayerAnimationElement::CreatePauseElement(
+          opacity_properties,
+          base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
+
+  ui::LayerAnimationElement::AnimatableProperties transform_properties;
+  transform_properties.insert(ui::LayerAnimationElement::TRANSFORM);
+  transform_sequence->AddElement(
+      ui::LayerAnimationElement::CreatePauseElement(
+          transform_properties,
+          base::TimeDelta::FromMilliseconds(kAnimationDurationInMs)));
+
+  std::vector<ui::LayerAnimationSequence*> animations;
+  // LayerAnimator::ScheduleTogether takes ownership of the sequences.
+  animations.push_back(opacity_sequence.release());
+  animations.push_back(transform_sequence.release());
+  layer()->GetAnimator()->ScheduleTogether(animations);
+}
+
+void AppPlaceholderView::OnPaint(gfx::Canvas* canvas) {
+  gfx::Rect rect(GetContentsBounds());
+  rect = rect.Center(gfx::Size(kIconSize, kIconSize));
+
+  canvas->FillRect(rect, kIconColor);
+}
+
+}  // namespace internal
+}  // namespace ash