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      1 // Copyright (c) 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_BASE_OZONE_EVENT_FACTORY_OZONE_H_
      6 #define UI_BASE_OZONE_EVENT_FACTORY_OZONE_H_
      7 
      8 #include <map>
      9 
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/message_loop/message_pump_libevent.h"
     12 #include "ui/base/ozone/event_converter_ozone.h"
     13 #include "ui/base/ui_export.h"
     14 
     15 namespace ui {
     16 
     17 class EventFactoryDelegateOzone;
     18 
     19 // Creates and dispatches |ui.Event|'s. Ozone assumes that events arrive on file
     20 // descriptors with one  |EventConverterOzone| instance for each descriptor.
     21 // Ozone presumes that the set of file desctiprtors can vary at runtime so this
     22 // class supports dynamically adding and removing |EventConverterOzone|
     23 // instances as necessary.
     24 class UI_EXPORT EventFactoryOzone {
     25  public:
     26   EventFactoryOzone();
     27   ~EventFactoryOzone();
     28 
     29   // Sets an optional delegate responsible for creating the starting set of
     30   // EventConvertOzones under management. This permits embedders to override the
     31   // Linux /dev/input/*-based default as desired. The caller must manage the
     32   // scope of this object.
     33   static void SetEventFactoryDelegateOzone(EventFactoryDelegateOzone* delegate);
     34 
     35   // Called from RootWindowHostOzone to create the starting set of event
     36   // converters.
     37   void CreateStartupEventConverters();
     38 
     39   // Add an |EventConverterOzone| instances for the given file descriptor.
     40   // Transfers ownership of the |EventConverterOzone| to this class.
     41   void AddEventConverter(int fd, scoped_ptr<EventConverterOzone> converter);
     42 
     43   // Remote the |EventConverterOzone|
     44   void RemoveEventConverter(int fd);
     45 
     46  private:
     47   // |EventConverterOzone| for each file descriptor.
     48   typedef EventConverterOzone* Converter;
     49   typedef base::MessagePumpLibevent::FileDescriptorWatcher* FDWatcher;
     50   std::map<int, Converter> converters_;
     51   std::map<int, FDWatcher> watchers_;
     52 
     53   static EventFactoryDelegateOzone* delegate_;
     54 
     55   DISALLOW_COPY_AND_ASSIGN(EventFactoryOzone);
     56 };
     57 
     58 }  // namespace ui
     59 
     60 #endif  // UI_BASE_OZONE_EVENT_FACTORY_OZONE_H_
     61