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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_x.h"
#include <gdk/gdkx.h>
#include <X11/extensions/XInput2.h>
#include "base/basictypes.h"
#include "base/message_loop.h"
namespace {
gboolean PlaceholderDispatch(GSource* source,
GSourceFunc cb,
gpointer data) {
return TRUE;
}
// A flag to disable GTK's message pump. This is intermediate step
// to remove gtk and will be removed once migration is complete.
bool use_gtk_message_pump = true;
} // namespace
namespace base {
MessagePumpX::MessagePumpX() : MessagePumpGlib(),
xiopcode_(-1),
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);
InitializeXInput2();
if (use_gtk_message_pump)
InitializeEventsToCapture();
}
MessagePumpX::~MessagePumpX() {
gdk_window_remove_filter(NULL, &GdkEventFilter, this);
gdk_event_handler_set(reinterpret_cast<GdkEventFunc>(gtk_main_do_event),
this, NULL);
}
// static
void MessagePumpX::DisableGtkMessagePump() {
use_gtk_message_pump = false;
}
// static
Display* MessagePumpX::GetDefaultXDisplay() {
static GdkDisplay* display = gdk_display_get_default();
return display ? GDK_DISPLAY_XDISPLAY(display) : NULL;
}
bool MessagePumpX::ShouldCaptureXEvent(XEvent* xev) {
return (!use_gtk_message_pump || capture_x_events_[xev->type])
&& (xev->type != GenericEvent || xev->xcookie.extension == xiopcode_)
;
}
bool MessagePumpX::ProcessXEvent(XEvent* xev) {
bool should_quit = false;
bool have_cookie = false;
if (xev->type == GenericEvent &&
XGetEventData(xev->xgeneric.display, &xev->xcookie)) {
have_cookie = true;
}
if (WillProcessXEvent(xev) == MessagePumpObserver::EVENT_CONTINUE) {
MessagePumpDispatcher::DispatchStatus status =
GetDispatcher()->Dispatch(xev);
if (status == MessagePumpDispatcher::EVENT_QUIT) {
should_quit = true;
Quit();
} else if (status == MessagePumpDispatcher::EVENT_IGNORED) {
VLOG(1) << "Event (" << xev->type << ") not handled.";
}
}
if (have_cookie) {
XFreeEventData(xev->xgeneric.display, &xev->xcookie);
}
return should_quit;
}
bool MessagePumpX::RunOnce(GMainContext* context, bool block) {
Display* display = GetDefaultXDisplay();
if (!display || !GetDispatcher())
return g_main_context_iteration(context, block);
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_ && use_gtk_message_pump)
gdksource_->source_funcs->dispatch = gdkdispatcher_;
g_main_context_iteration(context, FALSE);
}
}
bool retvalue;
if (gdksource_ && use_gtk_message_pump) {
// 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 MessagePumpX::GdkEventFilter(GdkXEvent* gxevent,
GdkEvent* gevent,
gpointer data) {
MessagePumpX* pump = static_cast<MessagePumpX*>(data);
XEvent* xev = static_cast<XEvent*>(gxevent);
if (pump->ShouldCaptureXEvent(xev) && pump->GetDispatcher()) {
pump->ProcessXEvent(xev);
return GDK_FILTER_REMOVE;
}
CHECK(use_gtk_message_pump) << "GdkEvent:" << gevent->type;
return GDK_FILTER_CONTINUE;
}
bool MessagePumpX::WillProcessXEvent(XEvent* xevent) {
ObserverListBase<MessagePumpObserver>::Iterator it(observers());
MessagePumpObserver* obs;
while ((obs = it.GetNext()) != NULL) {
if (obs->WillProcessXEvent(xevent))
return true;
}
return false;
}
void MessagePumpX::EventDispatcherX(GdkEvent* event, gpointer data) {
MessagePumpX* pump_x = reinterpret_cast<MessagePumpX*>(data);
CHECK(use_gtk_message_pump) << "GdkEvent:" << event->type;
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";
}
}
gtk_main_do_event(event);
}
void MessagePumpX::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;
capture_x_events_[GenericEvent] = true;
}
void MessagePumpX::InitializeXInput2(void) {
Display* display = GetDefaultXDisplay();
if (!display)
return;
int event, err;
if (!XQueryExtension(display, "XInputExtension", &xiopcode_, &event, &err)) {
VLOG(1) << "X Input extension not available.";
xiopcode_ = -1;
return;
}
int major = 2, minor = 0;
if (XIQueryVersion(display, &major, &minor) == BadRequest) {
VLOG(1) << "XInput2 not supported in the server.";
xiopcode_ = -1;
return;
}
}
MessagePumpObserver::EventStatus
MessagePumpObserver::WillProcessXEvent(XEvent* xev) {
return EVENT_CONTINUE;
}
COMPILE_ASSERT(XLASTEvent >= LASTEvent, XLASTEvent_too_small);
} // namespace base
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