Animate the script badges.

chrome/common/extensions/extension_action.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 "chrome/common/extensions/extension_action.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "chrome/common/badge_util.h"
 #include "googleurl/src/gurl.h"
 #include "grit/ui_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkDevice.h"
+#include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
+#include "ui/base/animation/animation_delegate.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/rect.h"
 
 namespace {
 
 // Different platforms need slightly different constants to look good.
 #if defined(OS_LINUX) && !defined(TOOLKIT_VIEWS)
 const float kTextSize = 9.0;
 const int kBottomMargin = 0;
@@ skipping 20 matching lines @@
 const int kBadgeHeight = 11;
 const int kMaxTextWidth = 23;
 // The minimum width for center-aligning the badge.
 const int kCenterAlignThreshold = 20;
 
 
 }  // namespace
 
 const int ExtensionAction::kDefaultTabId = -1;
 
+ExtensionAction::IconAnimation::IconAnimation(
+    ui::AnimationDelegate* delegate)
+    // 100ms animation at 50fps (so 5 animation frames in total).
+    : ui::LinearAnimation(100, 50, delegate) {}
+
+ExtensionAction::IconAnimation::~IconAnimation() {}
+
+const SkBitmap& ExtensionAction::IconAnimation::Apply(
+    const SkBitmap& icon) const {
+  DCHECK_GT(icon.width(), 0);
+  DCHECK_GT(icon.height(), 0);
+
+  if (!device_.get() ||
+      (device_->width() != icon.width()) ||
+      (device_->height() != icon.height())) {
+    device_.reset(new SkDevice(
+      SkBitmap::kARGB_8888_Config, icon.width(), icon.height(), true));
+  }
+
+  SkCanvas canvas(device_.get());
+  canvas.clear(SK_ColorWHITE);
+  SkPaint paint;
+  paint.setAlpha(CurrentValueBetween(0, 255));
+  canvas.drawBitmap(icon, 0, 0, &paint);
+  return device_->accessBitmap(false);
+}
+
+void ExtensionAction::IconAnimation::AddObserver(
+    ExtensionAction::IconAnimation::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ExtensionAction::IconAnimation::RemoveObserver(
+    ExtensionAction::IconAnimation::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void ExtensionAction::IconAnimation::AnimateToState(double state) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnIconChanged(*this));
+}
+
 ExtensionAction::ExtensionAction(const std::string& extension_id,
                                  Type action_type)
     : extension_id_(extension_id),
       action_type_(action_type) {
 }
 
 ExtensionAction::~ExtensionAction() {
 }
 
 void ExtensionAction::SetPopupUrl(int tab_id, const GURL& url) {
@@ skipping 23 matching lines @@
 
 void ExtensionAction::SetIconIndex(int tab_id, int index) {
   if (static_cast<size_t>(index) >= icon_paths_.size()) {
     NOTREACHED();
     return;
   }
   SetValue(&icon_index_, tab_id, index);
 }
 
 void ExtensionAction::ClearAllValuesForTab(int tab_id) {
+  popup_url_.erase(tab_id);
   title_.erase(tab_id);
   icon_.erase(tab_id);
   icon_index_.erase(tab_id);
   badge_text_.erase(tab_id);
   badge_text_color_.erase(tab_id);
   badge_background_color_.erase(tab_id);
   visible_.erase(tab_id);
-  popup_url_.erase(tab_id);
+  icon_animation_.erase(tab_id);
 }
 
 void ExtensionAction::PaintBadge(gfx::Canvas* canvas,
                                  const gfx::Rect& bounds,
                                  int tab_id) {
   std::string text = GetBadgeText(tab_id);
   if (text.empty())
     return;
 
   SkColor text_color = GetBadgeTextColor(tab_id);
@@ skipping 70 matching lines @@
   // text was too large.
   rect.fLeft += kPadding;
   rect.fRight -= kPadding;
   canvas->sk_canvas()->clipRect(rect);
   canvas->sk_canvas()->drawText(text.c_str(), text.size(),
                                 rect.fLeft + (rect.width() - text_width) / 2,
                                 rect.fTop + kTextSize + kTopTextPadding,
                                 *text_paint);
   canvas->Restore();
 }
+
+// Wraps an IconAnimation and implements its ui::AnimationDelegate to erase the
+// animation from a map when the animation ends or is cancelled, causing itself
+// and its owned IconAnimation to be deleted.
+class ExtensionAction::IconAnimationWrapper : public ui::AnimationDelegate {
+ public:
+  IconAnimationWrapper(ExtensionAction* owner, int tab_id)
+      : owner_(owner),
+        tab_id_(tab_id),
+        ALLOW_THIS_IN_INITIALIZER_LIST(animation_(this)) {}
+
+  virtual ~IconAnimationWrapper() {}
+
+  IconAnimation* animation() {
+    return &animation_;
+  }
+
+ private:
+  virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE {
+    Done();
+  }
+
+  virtual void AnimationCanceled(const ui::Animation* animation) OVERRIDE {
+    Done();
+  }
+
+  void Done() {
+    owner_->icon_animation_.erase(tab_id_);
+    // this will now have been deleted.
+  }
+
+  ExtensionAction* owner_;
+  int tab_id_;
+  IconAnimation animation_;
+};
+
+base::WeakPtr<ExtensionAction::IconAnimation> ExtensionAction::GetIconAnimation(

[Yoyo Zhou, 2012/06/26 18:38:15]

nit: Group ExtensionAnimation functions together in the cc file (don't interpose
the IconAnimationWrapper).

[not at google - send to devlin, 2012/06/27 06:26:54]

I don't understand what this means; they are grouped together? These are in the
.cc files the same order they are in the .h file.

[Yoyo Zhou, 2012/06/27 06:28:25]

Between ExtensionAction::PaintBadge and ExtensionAction::GetIconAnimation, you
have a whole class declaration.

+    int tab_id) const {
+  std::map<int, linked_ptr<IconAnimationWrapper> >::const_iterator it =
+      icon_animation_.find(tab_id);
+  return (it != icon_animation_.end()) ? it->second->animation()->AsWeakPtr()
+                                       : base::WeakPtr<IconAnimation>();
+}
+
+void ExtensionAction::RunIconAnimation(int tab_id) {
+  IconAnimationWrapper* icon_animation =
+      new IconAnimationWrapper(this, tab_id);
+  icon_animation_[tab_id] = make_linked_ptr(icon_animation);
+  icon_animation->animation()->Start();
+}