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// 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.
#include "base/message_pump_glib_x.h"
#include <gdk/gdkx.h>
#if defined(HAVE_XINPUT2)
#include <X11/extensions/XInput2.h>
#else
#include <X11/Xlib.h>
#endif
#include "base/message_pump_glib_x_dispatch.h"
namespace {
gboolean PlaceholderDispatch(GSource* source,
GSourceFunc cb,
gpointer data) {
return TRUE;
}
} // namespace
namespace base {
MessagePumpGlibX::MessagePumpGlibX() : base::MessagePumpForUI(),
#if defined(HAVE_XINPUT2)
xiopcode_(-1),
#endif
gdksource_(NULL),
dispatching_event_(false),
capture_x_events_(0),
capture_gdk_events_(0) {
gdk_window_add_filter(NULL, &GdkEventFilter, this);
gdk_event_handler_set(&EventDispatcherX, this, NULL);
#if defined(HAVE_XINPUT2)
InitializeXInput2();
#endif
InitializeEventsToCapture();
}
MessagePumpGlibX::~MessagePumpGlibX() {
gdk_window_remove_filter(NULL, &GdkEventFilter, this);
// It is not necessary to reset the GDK event handler using
// gdk_event_handler_set since it's done in the destructor for
// MessagePumpForUI.
}
bool MessagePumpGlibX::ShouldCaptureXEvent(XEvent* xev) {
return capture_x_events_[xev->type]
#if defined(HAVE_XINPUT2)
&& (xev->type != GenericEvent || xev->xcookie.extension == xiopcode_)
#endif
;
}
bool MessagePumpGlibX::ProcessXEvent(XEvent* xev) {
bool should_quit = false;
#if defined(HAVE_XINPUT2)
bool have_cookie = false;
if (xev->type == GenericEvent &&
XGetEventData(xev->xgeneric.display, &xev->xcookie)) {
have_cookie = true;
}
#endif
if (!WillProcessXEvent(xev)) {
MessagePumpGlibXDispatcher::DispatchStatus status =
static_cast<MessagePumpGlibXDispatcher*>
(GetDispatcher())->DispatchX(xev);
if (status == MessagePumpGlibXDispatcher::EVENT_QUIT) {
should_quit = true;
Quit();
} else if (status == MessagePumpGlibXDispatcher::EVENT_IGNORED) {
DLOG(WARNING) << "Event (" << xev->type << ") not handled.";
}
}
#if defined(HAVE_XINPUT2)
if (have_cookie) {
XFreeEventData(xev->xgeneric.display, &xev->xcookie);
}
#endif
return should_quit;
}
bool MessagePumpGlibX::RunOnce(GMainContext* context, bool block) {
GdkDisplay* gdisp = gdk_display_get_default();
if (!gdisp || !GetDispatcher())
return MessagePumpForUI::RunOnce(context, block);
Display* display = GDK_DISPLAY_XDISPLAY(gdisp);
if (XPending(display)) {
XEvent xev;
XPeekEvent(display, &xev);
if (ShouldCaptureXEvent(&xev)) {
XNextEvent(display, &xev);
if (ProcessXEvent(&xev))
return true;
} else {
// TODO(sad): A couple of extra events can still sneak in during this.
// Those should be sent back to the X queue from the dispatcher
// EventDispatcherX.
if (gdksource_)
gdksource_->source_funcs->dispatch = gdkdispatcher_;
g_main_context_iteration(context, FALSE);
}
}
bool retvalue;
if (gdksource_) {
// Replace the dispatch callback of the GDK event source temporarily so that
// it doesn't read events from X.
gboolean (*cb)(GSource*, GSourceFunc, void*) =
gdksource_->source_funcs->dispatch;
gdksource_->source_funcs->dispatch = PlaceholderDispatch;
dispatching_event_ = true;
retvalue = g_main_context_iteration(context, block);
dispatching_event_ = false;
gdksource_->source_funcs->dispatch = cb;
} else {
retvalue = g_main_context_iteration(context, block);
}
return retvalue;
}
GdkFilterReturn MessagePumpGlibX::GdkEventFilter(GdkXEvent* gxevent,
GdkEvent* gevent,
gpointer data) {
MessagePumpGlibX* pump = static_cast<MessagePumpGlibX*>(data);
XEvent* xev = static_cast<XEvent*>(gxevent);
if (pump->ShouldCaptureXEvent(xev) && pump->GetDispatcher()) {
pump->ProcessXEvent(xev);
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
bool MessagePumpGlibX::WillProcessXEvent(XEvent* xevent) {
ObserverListBase<Observer>::Iterator it(observers());
Observer* obs;
while ((obs = it.GetNext()) != NULL) {
MessagePumpXObserver* xobs =
static_cast<MessagePumpXObserver*>(obs);
if (xobs->WillProcessXEvent(xevent))
return true;
}
return false;
}
void MessagePumpGlibX::EventDispatcherX(GdkEvent* event, gpointer data) {
MessagePumpGlibX* pump_x = reinterpret_cast<MessagePumpGlibX*>(data);
if (!pump_x->gdksource_) {
pump_x->gdksource_ = g_main_current_source();
if (pump_x->gdksource_)
pump_x->gdkdispatcher_ = pump_x->gdksource_->source_funcs->dispatch;
} else if (!pump_x->IsDispatchingEvent()) {
if (event->type != GDK_NOTHING &&
pump_x->capture_gdk_events_[event->type]) {
NOTREACHED() << "GDK received an event it shouldn't have";
}
}
pump_x->DispatchEvents(event);
}
void MessagePumpGlibX::InitializeEventsToCapture(void) {
// TODO(sad): Decide which events we want to capture and update the tables
// accordingly.
capture_x_events_[KeyPress] = true;
capture_gdk_events_[GDK_KEY_PRESS] = true;
capture_x_events_[KeyRelease] = true;
capture_gdk_events_[GDK_KEY_RELEASE] = true;
capture_x_events_[ButtonPress] = true;
capture_gdk_events_[GDK_BUTTON_PRESS] = true;
capture_x_events_[ButtonRelease] = true;
capture_gdk_events_[GDK_BUTTON_RELEASE] = true;
capture_x_events_[MotionNotify] = true;
capture_gdk_events_[GDK_MOTION_NOTIFY] = true;
#if defined(HAVE_XINPUT2)
capture_x_events_[GenericEvent] = true;
#endif
}
#if defined(HAVE_XINPUT2)
void MessagePumpGlibX::InitializeXInput2(void) {
GdkDisplay* display = gdk_display_get_default();
if (!display)
return;
Display* xdisplay = GDK_DISPLAY_XDISPLAY(display);
int event, err;
if (!XQueryExtension(xdisplay, "XInputExtension", &xiopcode_, &event, &err)) {
DLOG(WARNING) << "X Input extension not available.";
xiopcode_ = -1;
return;
}
int major = 2, minor = 0;
if (XIQueryVersion(xdisplay, &major, &minor) == BadRequest) {
DLOG(WARNING) << "XInput2 not supported in the server.";
xiopcode_ = -1;
return;
}
}
#endif // HAVE_XINPUT2
bool MessagePumpXObserver::WillProcessXEvent(XEvent* xev) {
return false;
}
} // namespace base
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