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// Copyright (c) 2012 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/memory/scoped_ptr.h"
#include "base/message_pump.h"
#include "base/message_pump_glib.h"
#include "base/message_pump_observer.h"
#include <bitset>
#include <glib.h>
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.
};
virtual ~MessagePumpDispatcher() {}
// 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;
};
// This class implements a message-pump for dispatching X events.
class BASE_EXPORT MessagePumpX : public MessagePumpGlib {
public:
MessagePumpX();
virtual ~MessagePumpX();
// Returns default X Display.
static Display* GetDefaultXDisplay();
// Returns true if the system supports XINPUT2.
static bool HasXInput2();
// Sets the default dispatcher to process native events.
static void SetDefaultDispatcher(MessagePumpDispatcher* dispatcher);
// Internal function. Called by the glib source dispatch function. Processes
// all available X events.
gboolean DispatchXEvents();
private:
// Initializes the glib event source for X.
void InitXSource();
// Dispatches the XEvent and returns true if we should exit the current loop
// of message processing.
bool ProcessXEvent(MessagePumpDispatcher* dispatcher, 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);
// The event source for X events.
GSource* x_source_;
// The poll attached to |x_source_|.
scoped_ptr<GPollFD> x_poll_;
DISALLOW_COPY_AND_ASSIGN(MessagePumpX);
};
typedef MessagePumpX MessagePumpForUI;
} // namespace base
#endif // BASE_MESSAGE_PUMP_X_H
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