ash: Animate changes in the uber tray.

ash/system/tray/tray_item_view.cc

Index: ash/system/tray/tray_item_view.cc
diff --git a/ash/system/tray/tray_item_view.cc b/ash/system/tray/tray_item_view.cc
new file mode 100644
index 0000000000000000000000000000000000000000..22a605b68048c119d635d9657d11b901df27acf4
--- /dev/null
+++ b/ash/system/tray/tray_item_view.cc
@@ -0,0 +1,114 @@
+// 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/system/tray/tray_item_view.h"
+
+#include "ui/base/animation/slide_animation.h"
+#include "ui/gfx/compositor/layer.h"
+#include "ui/views/controls/image_view.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/widget/widget.h"
+
+namespace {
+const int kTrayIconHeight = 29;
+const int kTrayItemAnimationDurationMS = 200;
+}
+
+namespace ash {
+namespace internal {
+
+TrayItemView::TrayItemView()
+    : label_(NULL),
+      image_view_(NULL) {
+  SetPaintToLayer(true);
+  SetFillsBoundsOpaquely(false);
+  SetLayoutManager(new views::FillLayout);
+}
+
+TrayItemView::~TrayItemView() {}
+
+void TrayItemView::CreateLabel() {
+  label_ = new views::Label;
+  AddChildView(label_);
+}
+
+void TrayItemView::CreateImageView() {
+  image_view_ = new views::ImageView;
+  AddChildView(image_view_);
+}
+
+void TrayItemView::SetVisible(bool set_visible) {
+  if (!GetWidget()) {
+    views::View::SetVisible(set_visible);
+    return;
+  }
+
+  if (!animation_.get()) {
+    animation_.reset(new ui::SlideAnimation(this));
+    animation_->SetSlideDuration(GetAnimationDurationMS());
+    animation_->SetTweenType(ui::Tween::LINEAR);
+    animation_->Reset(visible() ? 1.0 : 0.0);
+  }
+
+  if (!set_visible) {
+    animation_->Hide();
+    AnimationProgressed(animation_.get());
+  } else {
+    animation_->Show();
+    AnimationProgressed(animation_.get());
+    views::View::SetVisible(true);
+  }
+}
+
+void TrayItemView::ApplyChange() {
+  // Forcing the widget to the new size is sufficient. The positioning is
+  // taken care of by the layout manager (ShelfLayoutManager).
+  GetWidget()->SetSize(GetWidget()->GetContentsView()->GetPreferredSize());
+}
+
+gfx::Size TrayItemView::DesiredSize() {
+  return views::View::GetPreferredSize();
+}
+
+int TrayItemView::GetAnimationDurationMS() {
+  return kTrayItemAnimationDurationMS;
+}
+
+void TrayItemView::PreferredSizeChanged() {
+  views::View::PreferredSizeChanged();
+  ApplyChange();
+}
+
+gfx::Size TrayItemView::GetPreferredSize() {
+  gfx::Size size = DesiredSize();
+  size.set_height(kTrayIconHeight);
+  if (!animation_.get() || !animation_->is_animating())
+    return size;
+  size.set_width(std::max(1,
+      static_cast<int>(size.width() * animation_->GetCurrentValue())));
+  return size;
+}
+
+void TrayItemView::AnimationProgressed(const ui::Animation* animation) {
+  ui::Transform transform;
+  transform.SetScale(animation->GetCurrentValue(),
+                     animation->GetCurrentValue());
+  transform.ConcatTranslate(0, animation->CurrentValueBetween(
+      static_cast<double>(height()) / 2, 0.));
+  layer()->SetTransform(transform);
+  ApplyChange();
+}
+
+void TrayItemView::AnimationEnded(const ui::Animation* animation) {
+  if (animation->GetCurrentValue() < 0.1)
+    views::View::SetVisible(false);
+}
+
+void TrayItemView::AnimationCanceled(const ui::Animation* animation) {
+  AnimationEnded(animation);
+}
+
+}  // namespace internal
+}  // namespace ash