blob: 21516010811a647cc1a1e22c6505b107a636fb8e [file] [log] [blame]
// Copyright 2014 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/macros.h"
#include "ui/events/platform/x11/x11_event_source.h"
#include <glib.h>
#include <X11/Xlib.h>
namespace ui {
namespace {
struct GLibX11Source : public GSource {
// Note: The GLibX11Source is created and destroyed by GLib. So its
// constructor/destructor may or may not get called.
XDisplay* display;
GPollFD* poll_fd;
};
gboolean XSourcePrepare(GSource* source, gint* timeout_ms) {
GLibX11Source* gxsource = static_cast<GLibX11Source*>(source);
if (XPending(gxsource->display))
*timeout_ms = 0;
else
*timeout_ms = -1;
return FALSE;
}
gboolean XSourceCheck(GSource* source) {
GLibX11Source* gxsource = static_cast<GLibX11Source*>(source);
return XPending(gxsource->display);
}
gboolean XSourceDispatch(GSource* source,
GSourceFunc unused_func,
gpointer data) {
X11EventSource* x11_source = static_cast<X11EventSource*>(data);
x11_source->DispatchXEvents();
return TRUE;
}
GSourceFuncs XSourceFuncs = {
XSourcePrepare,
XSourceCheck,
XSourceDispatch,
NULL
};
class X11EventSourceGlib : public X11EventSource {
public:
explicit X11EventSourceGlib(XDisplay* display)
: X11EventSource(display),
x_source_(NULL) {
InitXSource(ConnectionNumber(display));
}
~X11EventSourceGlib() override {
g_source_destroy(x_source_);
g_source_unref(x_source_);
}
private:
void InitXSource(int fd) {
CHECK(!x_source_);
CHECK(display()) << "Unable to get connection to X server";
x_poll_.reset(new GPollFD());
x_poll_->fd = fd;
x_poll_->events = G_IO_IN;
x_poll_->revents = 0;
GLibX11Source* glib_x_source = static_cast<GLibX11Source*>
(g_source_new(&XSourceFuncs, sizeof(GLibX11Source)));
glib_x_source->display = display();
glib_x_source->poll_fd = x_poll_.get();
x_source_ = glib_x_source;
g_source_add_poll(x_source_, x_poll_.get());
g_source_set_can_recurse(x_source_, TRUE);
g_source_set_callback(x_source_, NULL, this, NULL);
g_source_attach(x_source_, g_main_context_default());
}
// The GLib event source for X events.
GSource* x_source_;
// The poll attached to |x_source_|.
scoped_ptr<GPollFD> x_poll_;
DISALLOW_COPY_AND_ASSIGN(X11EventSourceGlib);
};
} // namespace
scoped_ptr<PlatformEventSource> PlatformEventSource::CreateDefault() {
return make_scoped_ptr(new X11EventSourceGlib(gfx::GetXDisplay()));
}
} // namespace ui