Input Injection API on Ozone

ui/events/ozone/evdev/event_factory_evdev.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_OZONE_EVDEV_EVENT_FACTORY_EVDEV_H_
 #define UI_EVENTS_OZONE_EVDEV_EVENT_FACTORY_EVDEV_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_runner.h"
 #include "ui/events/ozone/device/device_event_observer.h"
 #include "ui/events/ozone/evdev/event_converter_evdev.h"
 #include "ui/events/ozone/evdev/event_modifiers_evdev.h"
 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
 #include "ui/events/ozone/evdev/keyboard_evdev.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/ozone/public/system_input_injector.h"
 
 namespace gfx {
 class PointF;
 }  // namespace gfx
 
 namespace ui {
 
 class CursorDelegateEvdev;
 class DeviceManager;
+class SystemInputInjector;
 
 #if defined(USE_EVDEV_GESTURES)
 class GesturePropertyProvider;
 #endif
 
 // Ozone events implementation for the Linux input subsystem ("evdev").
 class EVENTS_OZONE_EVDEV_EXPORT EventFactoryEvdev : public DeviceEventObserver,
                                                     public PlatformEventSource {
  public:
   EventFactoryEvdev(CursorDelegateEvdev* cursor,
                     DeviceManager* device_manager);
   ~EventFactoryEvdev() override;
 
   void WarpCursorTo(gfx::AcceleratedWidget widget,
                     const gfx::PointF& location);
 
+  scoped_ptr<SystemInputInjector> CreateSystemInputInjector();

[kelvinp, 2014/11/25 04:43:08]

Why CreateSystemInputInjector() instead of GetSystemInputInjector()?
A new instance of the input injector is created for each client so that we can
track the the modifiers applied by any particular client.  In this way, even if
a client sends a Ctrl down without a Ctrl Up, we can reset the modifiers when
the instance is destroyed to prevent modifier keys from getting stuck.

+
  protected:
   // DeviceEventObserver overrides:
   //
   // Callback for device add (on UI thread).
   void OnDeviceEvent(const DeviceEvent& event) override;
 
   // PlatformEventSource:
   void OnDispatcherListChanged() override;
 
  private:
@@ skipping 44 matching lines @@
 
   // Support weak pointers for attach & detach callbacks.
   base::WeakPtrFactory<EventFactoryEvdev> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EventFactoryEvdev);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_FACTORY_EVDEV_H_