ui/ozone/ozone_platform.h

   1 // Copyright 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_OZONE_OZONE_PLATFORM_H_
   6 #define UI_OZONE_OZONE_PLATFORM_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "ui/ozone/ozone_export.h"
  10
  11 namespace gfx {
  12 class SurfaceFactoryOzone;
  13 }
  14
  15 namespace ui {
  16
  17 class CursorFactoryOzone;
  18 class EventFactoryOzone;
  19 class NativeDisplayDelegate;
  20 class TouchscreenDeviceManager;
  21
  22 // Base class for Ozone platform implementations.
  23 //
  24 // Ozone platforms must override this class and implement the virtual
  25 // GetFooFactoryOzone() methods to provide implementations of the
  26 // various ozone interfaces.
  27 //
  28 // The OzonePlatform subclass can own any state needed by the
  29 // implementation that is shared between the various ozone interfaces,
  30 // such as a connection to the windowing system.
  31 //
  32 // A platform is free to use different implementations of each
  33 // interface depending on the context. You can, for example, create
  34 // different objects depending on the underlying hardware, command
  35 // line flags, or whatever is appropriate for the platform.
  36 class OZONE_EXPORT OzonePlatform {
  37  public:
  38   OzonePlatform();
  39   virtual ~OzonePlatform();
  40
  41   // Initializes the subsystems/resources necessary for the UI process (e.g.
  42   // events, surface, etc.)
  43   static void InitializeForUI();
  44
  45   // Initializes the subsystems/resources necessary for the GPU process.
  46   static void InitializeForGPU();
  47
  48   static OzonePlatform* GetInstance();
  49
  50   // Factory getters to override in subclasses. The returned objects will be
  51   // injected into the appropriate layer at startup. Subclasses should not
  52   // inject these objects themselves. Ownership is retained by OzonePlatform.
  53   virtual gfx::SurfaceFactoryOzone* GetSurfaceFactoryOzone() = 0;
  54   virtual ui::EventFactoryOzone* GetEventFactoryOzone() = 0;
  55   virtual ui::CursorFactoryOzone* GetCursorFactoryOzone() = 0;
  56 #if defined(OS_CHROMEOS)
  57   virtual scoped_ptr<ui::NativeDisplayDelegate>
  58       CreateNativeDisplayDelegate() = 0;
  59   virtual scoped_ptr<ui::TouchscreenDeviceManager>
  60       CreateTouchscreenDeviceManager() = 0;
  61 #endif
  62
  63  private:
  64   virtual void InitializeUI() = 0;
  65   virtual void InitializeGPU() = 0;
  66
  67   static void CreateInstance();
  68
  69   static OzonePlatform* instance_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(OzonePlatform);
  72 };
  73
  74 }  // namespace ui
  75
  76 #endif  // UI_OZONE_OZONE_PLATFORM_H_