ui/aura/root_window_transformer.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_AURA_ROOT_WINDOW_TRANSFORMER_H_
   6 #define UI_AURA_ROOT_WINDOW_TRANSFORMER_H_
   7
   8 #include "ui/aura/aura_export.h"
   9
  10 namespace gfx {
  11 class Insets;
  12 class Rect;
  13 class Size;
  14 class Transform;
  15 }
  16
  17 namespace aura {
  18
  19 // RootWindowTransformer controls how RootWindow should be placed and
  20 // transformed inside the host window.
  21 class AURA_EXPORT RootWindowTransformer {
  22  public:
  23   virtual ~RootWindowTransformer() {}
  24
  25   // Returns the transform the root window in DIP.
  26   virtual gfx::Transform GetTransform() const = 0;
  27
  28   // Returns the inverse of the transform above. This method is to
  29   // provie an accurate inverse of the transform because the result of
  30   // |gfx::Transform::GetInverse| may contains computational error.
  31   virtual gfx::Transform GetInverseTransform() const = 0;
  32
  33   // Returns the root window's bounds for given host window size in DIP.
  34   // This is necessary to handle the case where the root window's size
  35   // is bigger than the host window. (Screen magnifier for example).
  36   virtual gfx::Rect GetRootWindowBounds(const gfx::Size& host_size) const = 0;
  37
  38   // Returns the insets that specifies the effective area of
  39   // the host window.
  40   virtual gfx::Insets GetHostInsets() const = 0;
  41 };
  42
  43 }  // namespace aura
  44
  45 #endif  // UI_AURA_ROOT_WINDOW_TRANSFORMER_H_