src/gui/kernel/qeventdispatcher_x11.cpp
changeset 0 1918ee327afb
child 4 3b1da2848fc7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/kernel/qeventdispatcher_x11.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,191 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qeventdispatcher_x11_p.h"
+
+#include "qapplication.h"
+#include "qx11info_x11.h"
+
+#include "qt_x11_p.h"
+#include <private/qeventdispatcher_unix_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QEventDispatcherX11Private : public QEventDispatcherUNIXPrivate
+{
+    Q_DECLARE_PUBLIC(QEventDispatcherX11)
+public:
+    inline QEventDispatcherX11Private()
+        : xfd(-1)
+    { }
+    int xfd;
+    QList<XEvent> queuedUserInputEvents;
+};
+
+QEventDispatcherX11::QEventDispatcherX11(QObject *parent)
+    : QEventDispatcherUNIX(*new QEventDispatcherX11Private, parent)
+{ }
+
+QEventDispatcherX11::~QEventDispatcherX11()
+{ }
+
+bool QEventDispatcherX11::processEvents(QEventLoop::ProcessEventsFlags flags)
+{
+    Q_D(QEventDispatcherX11);
+
+    d->interrupt = false;
+    QApplication::sendPostedEvents();
+
+    ulong marker = XNextRequest(X11->display);
+    int nevents = 0;
+    do {
+        while (!d->interrupt) {
+            XEvent event;
+            if (!(flags & QEventLoop::ExcludeUserInputEvents)
+                && !d->queuedUserInputEvents.isEmpty()) {
+                // process a pending user input event
+                event = d->queuedUserInputEvents.takeFirst();
+            } else if (XEventsQueued(X11->display, QueuedAlready)) {
+                // process events from the X server
+                XNextEvent(X11->display, &event);
+
+                if (flags & QEventLoop::ExcludeUserInputEvents) {
+                    // queue user input events
+                    switch (event.type) {
+                    case ButtonPress:
+                    case ButtonRelease:
+                    case MotionNotify:
+                    case XKeyPress:
+                    case XKeyRelease:
+                    case EnterNotify:
+                    case LeaveNotify:
+                        d->queuedUserInputEvents.append(event);
+                        continue;
+
+                    case ClientMessage:
+                        // only keep the wm_take_focus and
+                        // _qt_scrolldone protocols, queue all other
+                        // client messages
+                        if (event.xclient.format == 32) {
+                            if (event.xclient.message_type == ATOM(WM_PROTOCOLS) &&
+                                (Atom) event.xclient.data.l[0] == ATOM(WM_TAKE_FOCUS)) {
+                                break;
+                            } else if (event.xclient.message_type == ATOM(_QT_SCROLL_DONE)) {
+                                break;
+                            }
+                        }
+                        d->queuedUserInputEvents.append(event);
+                        continue;
+
+                    default:
+                        break;
+                    }
+                }
+            } else {
+                // no event to process
+                break;
+            }
+
+            // send through event filter
+            if (filterEvent(&event))
+                continue;
+
+            nevents++;
+            if (qApp->x11ProcessEvent(&event) == 1)
+                return true;
+
+            if (event.xany.serial >= marker) {
+                if (XEventsQueued(X11->display, QueuedAfterFlush))
+                    flags &= ~QEventLoop::WaitForMoreEvents;
+                goto out;
+            }
+        }
+    } while (!d->interrupt && XEventsQueued(X11->display, QueuedAfterFlush));
+
+ out:
+    if (!d->interrupt) {
+        const uint exclude_all =
+            QEventLoop::ExcludeSocketNotifiers | QEventLoop::X11ExcludeTimers | QEventLoop::WaitForMoreEvents;
+        if (nevents > 0 && ((uint)flags & exclude_all) == exclude_all) {
+            QApplication::sendPostedEvents();
+            return nevents > 0;
+        }
+        // return true if we handled events, false otherwise
+        return QEventDispatcherUNIX::processEvents(flags) ||  (nevents > 0);
+    }
+    return nevents > 0;
+}
+
+bool QEventDispatcherX11::hasPendingEvents()
+{
+    extern uint qGlobalPostedEventsCount(); // from qapplication.cpp
+    return (qGlobalPostedEventsCount() || XPending(X11->display));
+}
+
+void QEventDispatcherX11::flush()
+{
+    XFlush(X11->display);
+}
+
+void QEventDispatcherX11::startingUp()
+{
+    Q_D(QEventDispatcherX11);
+    d->xfd = XConnectionNumber(X11->display);
+}
+
+void QEventDispatcherX11::closingDown()
+{
+    Q_D(QEventDispatcherX11);
+    d->xfd = -1;
+}
+
+int QEventDispatcherX11::select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+                                timeval *timeout)
+{
+    Q_D(QEventDispatcherX11);
+    if (d->xfd > 0) {
+        nfds = qMax(nfds - 1, d->xfd) + 1;
+        FD_SET(d->xfd, readfds);
+    }
+    return QEventDispatcherUNIX::select(nfds, readfds, writefds, exceptfds, timeout);
+}
+
+QT_END_NAMESPACE