ash/magnifier/magnification_controller.h

   1 // Copyright (c) 2012 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_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
   6 #define ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "ui/gfx/point.h"
  13 #include "ui/gfx/rect.h"
  14
  15 namespace aura {
  16 class RootWindow;
  17 }
  18
  19 namespace ash {
  20
  21 class ASH_EXPORT MagnificationController {
  22  public:
  23   enum ScrollDirection {
  24     SCROLL_NONE,
  25     SCROLL_LEFT,
  26     SCROLL_RIGHT,
  27     SCROLL_UP,
  28     SCROLL_DOWN
  29   };
  30
  31   virtual ~MagnificationController() {}
  32
  33   // Creates a new MagnificationController. The caller takes ownership of the
  34   // returned object.
  35   static MagnificationController* CreateInstance();
  36
  37   // Enables (or disables if |enabled| is false) screen magnifier feature.
  38   virtual void SetEnabled(bool enabled) = 0;
  39
  40   // Returns if the screen magnifier is enabled or not.
  41   virtual bool IsEnabled() const = 0;
  42
  43   // Sets the magnification ratio. 1.0f means no magnification.
  44   virtual void SetScale(float scale, bool animate) = 0;
  45   // Returns the current magnification ratio.
  46   virtual float GetScale() const = 0;
  47
  48   // Set the top-left point of the magnification window.
  49   virtual void MoveWindow(int x, int y, bool animate) = 0;
  50   virtual void MoveWindow(const gfx::Point& point, bool animate) = 0;
  51   // Returns the current top-left point of the magnification window.
  52   virtual gfx::Point GetWindowPosition() const = 0;
  53
  54   virtual void SetScrollDirection(ScrollDirection direction) = 0;
  55
  56   // Returns |point_of_interest_| in MagnificationControllerImpl. This is
  57   // the internal variable to stores the last mouse cursor (or last touched)
  58   // location. This method is only for test purpose.
  59   virtual gfx::Point GetPointOfInterestForTesting() = 0;
  60
  61  protected:
  62   MagnificationController() {}
  63
  64  private:
  65   DISALLOW_COPY_AND_ASSIGN(MagnificationController);
  66 };
  67
  68 }  // namespace ash
  69
  70 #endif  // ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_