Add PlatformWindow/Event related code for Ozone X11.

ui/ozone/platform/x11/x11_event_factory.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2016 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_PLATFORM_X11_X11_EVENT_SOURCE_H_
-#define UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_H_
+#ifndef UI_OZONE_PLATFORM_X11_X11_EVENT_FACTORY_H_
+#define UI_OZONE_PLATFORM_X11_X11_EVENT_FACTORY_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_pump_libevent.h"
 #include "ui/events/events_export.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/gfx/x/x11_types.h"
+#include "ui/ozone/platform/x11/x11_window_manager_ozone.h"
 
 typedef struct _GPollFD GPollFD;
 typedef struct _GSource GSource;
 typedef union _XEvent XEvent;
 typedef unsigned long XID;
 
 namespace ui {
 
-class X11HotplugEventHandler;
-
 // A PlatformEventSource implementation for reading events from X11 server and
 // dispatching the events to the appropriate dispatcher.
-class EVENTS_EXPORT X11EventSource : public PlatformEventSource {
+class EVENTS_EXPORT X11EventFactory

[sadrul, 2016/01/21 14:53:01]

Why can't we use X11EventSourceLibevent instead?

[kylechar, 2016/01/21 15:13:35]

Similar X11Window the existing X11EventSourceLibevent implementation needs
PlatformEvent to be XEvent*. The new implementation needs PlatformEvent to be
void*.

Also there are some circular dependency problems because X11EventFactory needs
to know how to route XEvent messages directly back to X11WindowOzone.

+    : public PlatformEventSource,
+      public base::MessagePumpLibevent::Watcher {
  public:
-  explicit X11EventSource(XDisplay* display);
-  ~X11EventSource() override;
+  explicit X11EventFactory(XDisplay* display,
+                           scoped_refptr<X11WindowManagerOzone> window_manager);
+  ~X11EventFactory() override;
 
-  static X11EventSource* GetInstance();
+  static X11EventFactory* GetInstance();
 
   // Called by the glib source dispatch function. Processes all (if any)
   // available X events.
   void DispatchXEvents();
 
   // Blocks on the X11 event queue until we receive notification from the
   // xserver that |w| has been mapped; StructureNotifyMask events on |w| are
   // pulled out from the queue and dispatched out of order.
   //
   // For those that know X11, this is really a wrapper around XWindowEvent
   // which still makes sure the preempted event is dispatched instead of
   // dropped on the floor. This method exists because mapping a window is
   // asynchronous (and we receive an XEvent when mapped), while there are also
   // functions which require a mapped window.
   void BlockUntilWindowMapped(XID window);
 
- protected:
-  XDisplay* display() { return display_; }
+ private:
+  void AddEventWatcher();
 
- private:
   // Extracts cookie data from |xevent| if it's of GenericType, and dispatches
   // the event. This function also frees up the cookie data after dispatch is
   // complete.
   uint32_t ExtractCookieDataDispatchEvent(XEvent* xevent);
 
   // PlatformEventSource:
-  uint32_t DispatchEvent(XEvent* xevent) override;
+  uint32_t DispatchEvent(base::NativeEvent event) override;
   void StopCurrentEventStream() override;
   void OnDispatcherListChanged() override;
 
+  // base::MessagePumpLibevent::Watcher:
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override;
+
+  // Dispatches a XEvent for a XWindow that can't be translated to a ui::Event.
+  void DispatchXEventToXWindow(const XEvent& xevent);
+
   // The connection to the X11 server used to receive the events.
   XDisplay* display_;
 
   // Keeps track of whether this source should continue to dispatch all the
   // available events.
-  bool continue_stream_;
+  bool continue_stream_ = true;
 
-  scoped_ptr<X11HotplugEventHandler> hotplug_event_handler_;
+  scoped_refptr<X11WindowManagerOzone> window_manager_;
+  base::MessagePumpLibevent::FileDescriptorWatcher watcher_controller_;
+  bool initialized_ = false;
 
-  DISALLOW_COPY_AND_ASSIGN(X11EventSource);
+  DISALLOW_COPY_AND_ASSIGN(X11EventFactory);
 };
 
 }  // namespace ui
 
-#endif  // UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_H_
+#endif  // UI_OZONE_PLATFORM_X11_X11_EVENT_FACTORY_H_