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      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 pointer devices we care about.  We maintain this list so that
     52   // it is not necessary to query X for the list of devices for each
     53   // GdkWindow created.
     54   std::set<int> pointer_devices_;
     55 #endif
     56 
     57   // The event source for GDK events.
     58   GSource* gdksource_;
     59 
     60   // The default GDK event dispatcher. This is stored so that it can be restored
     61   // when necessary during nested event dispatching.
     62   gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*);
     63 
     64   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
     65   // was captured and being processed by GDK (when |false|).
     66   bool dispatching_event_;
     67 
     68 #if ! GTK_CHECK_VERSION(2,18,0)
     69 // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
     70 // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
     71 // for all versions.
     72 #define GDK_EVENT_LAST 37
     73 #endif
     74 
     75   // We do not want to process all the events ourselves. So we use a lookup
     76   // table to quickly check if a particular event should be handled by us or if
     77   // it should be passed on to the default GDK handler.
     78   std::bitset<LASTEvent> capture_x_events_;
     79   std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
     80 
     81   DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX);
     82 };
     83 
     84 }  // namespace base
     85 
     86 #endif  // BASE_MESSAGE_PUMP_GLIB_X_H
     87