Move animation code to new ui/base/animation directory.

BUG=none
TEST=none
TBR=brettw

Review URL: http://codereview.chromium.org/6154001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70743 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 88 insertions, 0 deletions

diff --git a/ui/base/animation/multi_animation.cc b/ui/base/animation/multi_animation.cc
new file mode 100644
index 0000000..5a0c1e1
--- /dev/null
+++ b/ui/base/animation/multi_animation.cc
@@ -0,0 +1,88 @@
+// 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/multi_animation.h"
+
+#include "base/logging.h"
+#include "ui/base/animation/animation_delegate.h"
+
+namespace ui {
+
+// 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) {
+    DCHECK(parts[i].end_time_ms - parts[i].start_time_ms >= parts[i].time_ms);
+    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),
+      continuous_(true) {
+  DCHECK(!parts_.empty());
+}
+
+MultiAnimation::~MultiAnimation() {}
+
+double MultiAnimation::GetCurrentValue() const {
+  return current_value_;
+}
+
+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());
+  if (delta >= cycle_time_ms_ && !continuous_) {
+    current_part_index_ = parts_.size() - 1;
+    current_value_ = Tween::CalculateValue(parts_[current_part_index_].type, 1);
+    Stop();
+    return;
+  }
+  delta %= cycle_time_ms_;
+  const Part& part = GetPart(&delta, &current_part_index_);
+  double percent = static_cast<double>(delta + part.start_time_ms) /
+        static_cast<double>(part.end_time_ms);
+  DCHECK(percent <= 1);
+  current_value_ = Tween::CalculateValue(part.type, percent);
+
+  if ((current_value_ != last_value || current_part_index_ != last_index) &&
+      delegate()) {
+    delegate()->AnimationProgressed(this);
+  }
+}
+
+void MultiAnimation::SetStartTime(base::TimeTicks start_time) {
+  Animation::SetStartTime(start_time);
+  current_value_ = 0;
+  current_part_index_ = 0;
+}
+
+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];
+}
+
+}  // namespace ui