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      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_
     71