ash/host/transformer_helper.h

   1 // Copyright 2014 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 ASH_HOST_TRANSFORMER_HELPER_H_
   6 #define ASH_HOST_TRANSFORMER_HELPER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9
  10 namespace gfx {
  11 class Insets;
  12 class Size;
  13 class Transform;
  14 }
  15
  16 namespace ash {
  17 class AshWindowTreeHost;
  18 class RootWindowTransformer;
  19
  20 // A helper class to handle ash specific feature that requires
  21 // transforming a root window (such as rotation, UI zooming).
  22 class TransformerHelper {
  23  public:
  24   explicit TransformerHelper(AshWindowTreeHost* ash_host);
  25   ~TransformerHelper();
  26
  27   // Initializes the transformer with identity transform.
  28   void Init();
  29
  30   // Returns the the insets that specifies the effective root window
  31   // area within the host window.
  32   gfx::Insets GetHostInsets() const;
  33
  34   // Sets a simple transform with no host insets.
  35   void SetTransform(const gfx::Transform& transform);
  36
  37   // Sets a RootWindowTransformer which takes the insets into account.
  38   void SetRootWindowTransformer(scoped_ptr<RootWindowTransformer> transformer);
  39
  40   // Returns the transforms applied to the root window.
  41   gfx::Transform GetTransform() const;
  42   gfx::Transform GetInverseTransform() const;
  43
  44   // Updates the root window size based on the host size and
  45   // current transform.
  46   void UpdateWindowSize(const gfx::Size& host_size);
  47
  48  private:
  49   AshWindowTreeHost* ash_host_;
  50   scoped_ptr<RootWindowTransformer> transformer_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(TransformerHelper);
  53 };
  54
  55 }  // namespace ash
  56
  57 #endif  // ASH_HOST_TRANSFORMER_HELPER_H_