| // Copyright (c) 2011 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 BASE_MESSAGE_PUMP_X_H |
| #define BASE_MESSAGE_PUMP_X_H |
| |
| #include "base/message_pump.h" |
| #include "base/message_pump_glib.h" |
| #include "base/message_pump_observer.h" |
| |
| #include <bitset> |
| |
| #include <glib.h> |
| |
| #if defined(TOOLKIT_USES_GTK) |
| #include <gtk/gtk.h> |
| #endif |
| |
| typedef struct _XDisplay Display; |
| |
| namespace base { |
| |
| // The documentation for this class is in message_pump_glib.h |
| // |
| // The nested loop is exited by either posting a quit, or returning EVENT_QUIT |
| // from Dispatch. |
| class MessagePumpDispatcher { |
| public: |
| enum DispatchStatus { |
| EVENT_IGNORED, // The event was not processed. |
| EVENT_PROCESSED, // The event has been processed. |
| EVENT_QUIT // The event was processed and the message-loop should |
| // terminate. |
| }; |
| |
| // Dispatches the event. EVENT_IGNORED is returned if the event was ignored |
| // (i.e. not processed). EVENT_PROCESSED is returned if the event was |
| // processed. The nested loop exits immediately if EVENT_QUIT is returned. |
| virtual DispatchStatus Dispatch(XEvent* xevent) = 0; |
| |
| protected: |
| virtual ~MessagePumpDispatcher() {} |
| }; |
| |
| // This class implements a message-pump for dispatching X events. |
| class BASE_EXPORT MessagePumpX : public MessagePumpGlib { |
| public: |
| MessagePumpX(); |
| virtual ~MessagePumpX(); |
| |
| // Overridden from MessagePumpGlib: |
| virtual bool RunOnce(GMainContext* context, bool block) OVERRIDE; |
| |
| // Returns default X Display. |
| static Display* GetDefaultXDisplay(); |
| |
| // Returns true if the system supports XINPUT2. |
| static bool HasXInput2(); |
| |
| private: |
| // Initializes the glib event source for X. |
| void InitXSource(); |
| |
| // Decides whether we are interested in processing this XEvent. |
| bool ShouldCaptureXEvent(XEvent* event); |
| |
| // Dispatches the XEvent and returns true if we should exit the current loop |
| // of message processing. |
| bool ProcessXEvent(XEvent* event); |
| |
| // Sends the event to the observers. If an observer returns true, then it does |
| // not send the event to any other observers and returns true. Returns false |
| // if no observer returns true. |
| bool WillProcessXEvent(XEvent* xevent); |
| void DidProcessXEvent(XEvent* xevent); |
| #if defined(TOOLKIT_USES_GTK) |
| // Some XEvent's can't be directly read from X event queue and will go |
| // through GDK's dispatching process and may get discarded. This function |
| // sets up a filter to intercept those XEvent's we are interested in |
| // and dispatches them so that they won't get lost. |
| static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent, |
| GdkEvent* gevent, |
| gpointer data); |
| |
| static void EventDispatcherX(GdkEvent* event, gpointer data); |
| |
| // Indicates whether a GDK event was injected by chrome (when |true|) or if it |
| // was captured and being processed by GDK (when |false|). |
| bool IsDispatchingEvent(void) { return dispatching_event_; } |
| |
| // Update the lookup table and flag the events that should be captured and |
| // processed so that GDK doesn't get to them. |
| void InitializeEventsToCapture(void); |
| |
| // The event source for GDK events. |
| GSource* gdksource_; |
| |
| // The default GDK event dispatcher. This is stored so that it can be restored |
| // when necessary during nested event dispatching. |
| gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*); |
| |
| // Indicates whether a GDK event was injected by chrome (when |true|) or if it |
| // was captured and being processed by GDK (when |false|). |
| bool dispatching_event_; |
| |
| #if ! GTK_CHECK_VERSION(2,18,0) |
| // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a |
| // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works |
| // for all versions. |
| #define GDK_EVENT_LAST 37 |
| #endif |
| |
| // Ideally we would #include X.h for LASTEvent, but it brings in a lot of stupid |
| // stuff (like Time, CurrentTime etc.) that messes up a lot of things. So define |
| // XLASTEvent here to a large enough value so that it works. |
| #define XLASTEvent 40 |
| |
| // We do not want to process all the events ourselves. So we use a lookup |
| // table to quickly check if a particular event should be handled by us or if |
| // it should be passed on to the default GDK handler. |
| std::bitset<XLASTEvent> capture_x_events_; |
| std::bitset<GDK_EVENT_LAST> capture_gdk_events_; |
| #endif // defined(TOOLKIT_USES_GTK) |
| |
| // The event source for X events (used only when GTK event processing is |
| // disabled). |
| GSource* x_source_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MessagePumpX); |
| }; |
| |
| typedef MessagePumpX MessagePumpForUI; |
| |
| } // namespace base |
| |
| #endif // BASE_MESSAGE_PUMP_X_H |