121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
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#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
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#include <bitset>
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#include <map>
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#include "base/memory/scoped_ptr.h"
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#include "base/message_loop/message_pump.h"
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#include "base/message_loop/message_pump_dispatcher.h"
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#include "base/message_loop/message_pump_glib.h"
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#include "base/message_loop/message_pump_observer.h"
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#include "base/observer_list.h"
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// It would be nice to include the X11 headers here so that we use Window
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// instead of its typedef of unsigned long, but we can't because everything in
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// chrome includes us through base/message_loop/message_loop.h, and X11's crappy
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// #define heavy headers muck up half of chrome.
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typedef struct _GPollFD GPollFD;
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typedef struct _GSource GSource;
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typedef struct _XDisplay Display;
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namespace base {
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// This class implements a message-pump for dispatching X events.
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//
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// If there's a current dispatcher given through RunWithDispatcher(), that
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// dispatcher receives events. Otherwise, we route to messages to dispatchers
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// who have subscribed to messages from a specific X11 window.
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class BASE_EXPORT MessagePumpAuraX11 : public MessagePumpGlib,
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public MessagePumpDispatcher {
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public:
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MessagePumpAuraX11();
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virtual ~MessagePumpAuraX11();
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// Returns default X Display.
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static Display* GetDefaultXDisplay();
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// Returns true if the system supports XINPUT2.
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static bool HasXInput2();
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// Returns the UI message pump.
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static MessagePumpAuraX11* Current();
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// Adds/Removes |dispatcher| for the |xid|. This will route all messages from
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// the window |xid| to |dispatcher.
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void AddDispatcherForWindow(MessagePumpDispatcher* dispatcher,
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unsigned long xid);
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void RemoveDispatcherForWindow(unsigned long xid);
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// Adds/Removes |dispatcher| to receive all events sent to the X root
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// window. A root window can have multiple dispatchers, and events on root
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// windows will be dispatched to all.
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void AddDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
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void RemoveDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
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// Internal function. Called by the glib source dispatch function. Processes
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// all available X events.
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bool DispatchXEvents();
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// Blocks on the X11 event queue until we receive notification from the
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// xserver that |w| has been mapped; StructureNotifyMask events on |w| are
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// pulled out from the queue and dispatched out of order.
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//
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// For those that know X11, this is really a wrapper around XWindowEvent
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// which still makes sure the preempted event is dispatched instead of
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// dropped on the floor. This method exists because mapping a window is
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// asynchronous (and we receive an XEvent when mapped), while there are also
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// functions which require a mapped window.
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void BlockUntilWindowMapped(unsigned long xid);
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private:
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typedef std::map<unsigned long, MessagePumpDispatcher*> DispatchersMap;
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// Initializes the glib event source for X.
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void InitXSource();
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// Dispatches the XEvent and returns true if we should exit the current loop
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// of message processing.
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bool ProcessXEvent(MessagePumpDispatcher* dispatcher, XEvent* event);
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// Sends the event to the observers. If an observer returns true, then it does
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// not send the event to any other observers and returns true. Returns false
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// if no observer returns true.
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bool WillProcessXEvent(XEvent* xevent);
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void DidProcessXEvent(XEvent* xevent);
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// Returns the Dispatcher based on the event's target window.
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MessagePumpDispatcher* GetDispatcherForXEvent(const NativeEvent& xev) const;
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// Overridden from MessagePumpDispatcher:
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virtual bool Dispatch(const NativeEvent& event) OVERRIDE;
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// The event source for X events.
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GSource* x_source_;
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// The poll attached to |x_source_|.
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scoped_ptr<GPollFD> x_poll_;
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DispatchersMap dispatchers_;
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// Dispatch calls can cause addition of new dispatchers as we iterate
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// through them. Use ObserverList to ensure the iterator remains valid across
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// additions.
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ObserverList<MessagePumpDispatcher> root_window_dispatchers_;
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unsigned long x_root_window_;
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DISALLOW_COPY_AND_ASSIGN(MessagePumpAuraX11);
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};
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typedef MessagePumpAuraX11 MessagePumpForUI;
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} // namespace base
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#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
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