1 files changed, 81 insertions, 0 deletions
diff --git a/ui/base/animation/throb_animation.cc b/ui/base/animation/throb_animation.cc
new file mode 100644
index 0000000..95e9a65
--- /dev/null
+++ b/ui/base/animation/throb_animation.cc
@@ -0,0 +1,81 @@
+// Copyright (c) 2011 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 "ui/base/animation/throb_animation.h"
+
+#include <limits>
+
+namespace ui {
+
+static const int kDefaultThrobDurationMS = 400;
+
+ThrobAnimation::ThrobAnimation(AnimationDelegate* target)
+    : SlideAnimation(target),
+      slide_duration_(GetSlideDuration()),
+      throb_duration_(kDefaultThrobDurationMS),
+      cycles_remaining_(0),
+      throbbing_(false) {
+}
+
+void ThrobAnimation::StartThrobbing(int cycles_til_stop) {
+  cycles_til_stop = cycles_til_stop >= 0 ? cycles_til_stop :
+                                           std::numeric_limits<int>::max();
+  cycles_remaining_ = cycles_til_stop;
+  throbbing_ = true;
+  SlideAnimation::SetSlideDuration(throb_duration_);
+  if (is_animating())
+    return;  // We're already running, we'll cycle when current loop finishes.
+
+  if (IsShowing())
+    SlideAnimation::Hide();
+  else
+    SlideAnimation::Show();
+  cycles_remaining_ = cycles_til_stop;
+}
+
+void ThrobAnimation::Reset() {
+  ResetForSlide();
+  SlideAnimation::Reset();
+}
+
+void ThrobAnimation::Show() {
+  ResetForSlide();
+  SlideAnimation::Show();
+}
+
+void ThrobAnimation::Hide() {
+  ResetForSlide();
+  SlideAnimation::Hide();
+}
+
+void ThrobAnimation::SetSlideDuration(int duration) {
+  slide_duration_ = duration;
+}
+
+void ThrobAnimation::Step(base::TimeTicks time_now) {
+  LinearAnimation::Step(time_now);
+
+  if (!is_animating() && throbbing_) {
+    // Were throbbing a finished a cycle. Start the next cycle unless we're at
+    // the end of the cycles, in which case we stop.
+    cycles_remaining_--;
+    if (IsShowing()) {
+      // We want to stop hidden, hence this doesn't check cycles_remaining_.
+      SlideAnimation::Hide();
+    } else if (cycles_remaining_ > 0) {
+      SlideAnimation::Show();
+    } else {
+      // We're done throbbing.
+      throbbing_ = false;
+    }
+  }
+}
+
+void ThrobAnimation::ResetForSlide() {
+  SlideAnimation::SetSlideDuration(slide_duration_);
+  cycles_remaining_ = 0;
+  throbbing_ = false;
+}
+
+}  // namespace ui