Reenable triggering of screen rotations by sensors.

Depends on http://codereview.chromium.org/8395046

BUG=None
TEST=Visiting about:rotate?right, about:rotate?left, etc. should cause the appropriate screen rotations.


Review URL: http://codereview.chromium.org/8402002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108889 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 56 insertions, 0 deletions

diff --git a/ui/gfx/compositor/screen_rotation.h b/ui/gfx/compositor/screen_rotation.h
new file mode 100644
index 0000000..1d95a5d
--- /dev/null
+++ b/ui/gfx/compositor/screen_rotation.h
@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef UI_GFX_COMPOSITOR_SCREEN_ROTATION_H_
+#define UI_GFX_COMPOSITOR_SCREEN_ROTATION_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/animation/animation_delegate.h"
+#include "ui/gfx/compositor/compositor_export.h"
+#include "ui/gfx/compositor/layer_animation_element.h"
+#include "ui/gfx/point.h"
+
+namespace ui {
+class InterpolatedTransform;
+class LayerAnimationDelegate;
+
+// A screen rotation represents a single transition from one screen orientation
+// to another. The  intended usage is that a new instance of the class is
+// created for every transition. It is possible to update the target orientation
+// in the middle of a transition.
+class COMPOSITOR_EXPORT ScreenRotation : public LayerAnimationElement {
+ public:
+  // The screen rotation does not own the view or the listener, and these
+  // objects are required to outlive the Screen rotation object.
+  ScreenRotation(int degrees);
+  virtual ~ScreenRotation();
+
+ private:
+  // Implementation of LayerAnimationDelegate
+  virtual void OnStart(LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual void OnProgress(double t,
+                          LayerAnimationDelegate* delegate) OVERRIDE;
+  virtual void OnGetTarget(TargetValue* target) const OVERRIDE;
+  virtual void OnAbort() OVERRIDE;
+
+  static const LayerAnimationElement::AnimatableProperties& GetProperties();
+
+  // Generates the intermediate transformation matrices used during the
+  // animation.
+  scoped_ptr<InterpolatedTransform> interpolated_transform_;
+
+  // The number of degrees to rotate.
+  int degrees_;
+
+  // The target origin
+  gfx::Point new_origin_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenRotation);
+};
+
+}  // namespace ui
+
+#endif  // UI_GFX_COMPOSITOR_SCREEN_ROTATION_H_