base/message_pump_glib_x.h

   1 // Copyright (c) 2011 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 BASE_MESSAGE_PUMP_GLIB_X_H
   6 #define BASE_MESSAGE_PUMP_GLIB_X_H
   7
   8 #include "base/message_pump.h"
   9 #include "base/message_pump_glib.h"
  10
  11 #include <bitset>
  12 #include <set>
  13
  14 #include <glib.h>
  15 #include <gtk/gtk.h>
  16 #include <X11/X.h>
  17
  18 namespace base {
  19
  20 class MessagePumpGlibX : public MessagePumpForUI {
  21  public:
  22   MessagePumpGlibX();
  23   virtual ~MessagePumpGlibX();
  24
  25   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
  26   // was captured and being processed by GDK (when |false|).
  27   bool IsDispatchingEvent(void) { return dispatching_event_; }
  28
  29 #if defined(HAVE_XINPUT2)
  30   // Setup an X Window for XInput2 events.
  31   void SetupXInput2ForXWindow(Window xid);
  32 #endif
  33
  34   // Overridden from MessagePumpForUI:
  35   virtual bool RunOnce(GMainContext* context, bool block);
  36
  37  private:
  38   static void EventDispatcherX(GdkEvent* event, gpointer data);
  39
  40   // Update the lookup table and flag the events that should be captured and
  41   // processed so that GDK doesn't get to them.
  42   void InitializeEventsToCapture(void);
  43
  44 #if defined(HAVE_XINPUT2)
  45   // Initialize X2 input.
  46   void InitializeXInput2(void);
  47
  48   // The opcode used for checking events.
  49   int xiopcode_;
  50
  51   // The list of master pointer devices. We maintain this list so that it is not
  52   // necessary to query X for the list of devices for each GdkWindow created.
  53   std::set<int> masters_;
  54
  55   // The list of slave (physical) pointer devices.
  56   // TODO(sad): This is currently unused, and may be removed eventually.
  57   std::set<int> slaves_;
  58 #endif
  59
  60   // The event source for GDK events.
  61   GSource* gdksource_;
  62
  63   // The default GDK event dispatcher. This is stored so that it can be restored
  64   // when necessary during nested event dispatching.
  65   gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*);
  66
  67   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
  68   // was captured and being processed by GDK (when |false|).
  69   bool dispatching_event_;
  70
  71 #if ! GTK_CHECK_VERSION(2,18,0)
  72 // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
  73 // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
  74 // for all versions.
  75 #define GDK_EVENT_LAST 37
  76 #endif
  77
  78   // We do not want to process all the events ourselves. So we use a lookup
  79   // table to quickly check if a particular event should be handled by us or if
  80   // it should be passed on to the default GDK handler.
  81   std::bitset<LASTEvent> capture_x_events_;
  82   std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX);
  85 };
  86
  87 }  // namespace base
  88
  89 #endif  // BASE_MESSAGE_PUMP_GLIB_X_H