Support for Adaptive Handle Orientation

content/browser/renderer_host/input/touch_handle.h

 // Copyright 2014 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_HANDLE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_HANDLE_H_
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "ui/events/gesture_detection/motion_event.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace content {
 
 class TouchHandle;
 
 enum TouchHandleOrientation {
   TOUCH_HANDLE_LEFT,
   TOUCH_HANDLE_CENTER,
   TOUCH_HANDLE_RIGHT,
+  TOUCH_HANDLE_LEFT_INVERTED,

[jdduke (slow), 2014/08/20 15:15:01]

I don't think we should add these until we actually start using them; otherwise
it's confusing.

Also, INVERTED and FLIPPED is somewhat confusing terminology.  I almost feel
like the drawables could be responsible for "automatically" inverting/flipping
themselves to stay visible, rather than having that be explicitly controlled,
which could greatly increase complexity.

+  TOUCH_HANDLE_RIGHT_INVERTED,
+  TOUCH_HANDLE_LEFT_FLIPPED,
+  TOUCH_HANDLE_RIGHT_FLIPPED,
+  TOUCH_HANDLE_LEFT_FLIPPED_INVERTED,
+  TOUCH_HANDLE_RIGHT_FLIPPED_INVERTED,
+  TOUCH_HANDLE_CENTER_INVERTED,
   TOUCH_HANDLE_ORIENTATION_UNDEFINED,
 };
 
 // Interface through which |TouchHandle| delegates rendering-specific duties.
 class CONTENT_EXPORT TouchHandleDrawable {
  public:
   virtual ~TouchHandleDrawable() {}
   virtual void SetEnabled(bool enabled) = 0;
   virtual void SetOrientation(TouchHandleOrientation orientation) = 0;
   virtual void SetAlpha(float alpha) = 0;
@@ skipping 88 matching lines @@
   bool enabled_;
   bool is_visible_;
   bool is_dragging_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchHandle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_HANDLE_H_