Changes the mini tab title animation.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1902005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@46485 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 59 insertions, 0 deletions

diff --git a/app/multi_animation.cc b/app/multi_animation.cc
new file mode 100644
index 0000000..703ed85
--- /dev/null
+++ b/app/multi_animation.cc
@@ -0,0 +1,59 @@
+// Copyright (c) 2010 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 "app/multi_animation.h"
+
+// Default interval, in ms.
+static const int kDefaultInterval = 20;
+
+static int TotalTime(const MultiAnimation::Parts& parts) {
+  int time_ms = 0;
+  for (size_t i = 0; i < parts.size(); ++i)
+    time_ms += parts[i].time_ms;
+  return time_ms;
+}
+
+MultiAnimation::MultiAnimation(const Parts& parts)
+    : Animation(base::TimeDelta::FromMilliseconds(kDefaultInterval)),
+      parts_(parts),
+      cycle_time_ms_(TotalTime(parts)),
+      current_value_(0),
+      current_part_index_(0) {
+  DCHECK(!parts_.empty());
+}
+
+void MultiAnimation::Step(base::TimeTicks time_now) {
+  double last_value = current_value_;
+  size_t last_index = current_part_index_;
+
+  int delta = static_cast<int>((time_now - start_time()).InMilliseconds() %
+                               cycle_time_ms_);
+  const Part& part = GetPart(&delta, &current_part_index_);
+  double percent = static_cast<double>(delta) /
+        static_cast<double>(part.time_ms);
+  current_value_ = Tween::CalculateValue(part.type, percent);
+
+  if ((current_value_ != last_value || current_part_index_ != last_index) &&
+      delegate()) {
+    delegate()->AnimationProgressed(this);
+  }
+}
+
+const MultiAnimation::Part& MultiAnimation::GetPart(int* time_ms,
+                                                    size_t* part_index) {
+  DCHECK(*time_ms < cycle_time_ms_);
+
+  for (size_t i = 0; i < parts_.size(); ++i) {
+    if (*time_ms < parts_[i].time_ms) {
+      *part_index = i;
+      return parts_[i];
+    }
+
+    *time_ms -= parts_[i].time_ms;
+  }
+  NOTREACHED();
+  *time_ms = 0;
+  *part_index = 0;
+  return parts_[0];
+}