add WM support class

Add a QXcbWMSupport class to better integrate with
NET_WM compliant window managers.

Suppport NET_WM_USER_TIME on windows.

Reviewed-by: Samuel

1 files changed, 136 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbwmsupport.cpp b/src/plugins/platforms/xcb/qxcbwmsupport.cpp
new file mode 100644
index 0000000000..8e55bf8e41
--- /dev/null
+++ b/src/plugins/platforms/xcb/qxcbwmsupport.cpp
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qxcbwmsupport.h"
+#include "qxcbscreen.h"
+
+#include <qdebug.h>
+
+QXcbWMSupport::QXcbWMSupport(QXcbConnection *c)
+    : QXcbObject(c)
+{
+    updateNetWMAtoms();
+    updateVirtualRoots();
+}
+
+bool QXcbWMSupport::isSupportedByWM(xcb_atom_t atom) const
+{
+    return net_wm_atoms.contains(atom);
+}
+
+
+
+void QXcbWMSupport::updateNetWMAtoms()
+{
+    net_wm_atoms.clear();
+
+    xcb_window_t root = connection()->screens().at(connection()->primaryScreen())->root();
+    int offset = 0;
+    int remaining = 0;
+    do {
+        xcb_generic_error_t *error = 0;
+        xcb_get_property_cookie_t cookie = xcb_get_property(xcb_connection(), false, root, atom(QXcbAtom::_NET_SUPPORTED), QXcbAtom::XA_ATOM, offset, 1024);
+        xcb_get_property_reply_t *reply = xcb_get_property_reply(xcb_connection(), cookie, &error);
+        if (!reply || error)
+            break;
+
+        remaining = 0;
+
+        if (reply->type == QXcbAtom::XA_ATOM && reply->format == 32) {
+            int len = xcb_get_property_value_length(reply)/4;
+            xcb_atom_t *atoms = (xcb_atom_t *)xcb_get_property_value(reply);
+            int s = net_wm_atoms.size();
+            net_wm_atoms.resize(s + len);
+            memcpy(net_wm_atoms.data() + s, atoms, len*sizeof(xcb_atom_t));
+
+            remaining = reply->bytes_after;
+            offset += len;
+        }
+
+        free(reply);
+    } while (remaining > 0);
+
+//    qDebug() << "======== updateNetWMAtoms";
+//    for (int i = 0; i < net_wm_atoms.size(); ++i)
+//        qDebug() << atomName(net_wm_atoms.at(i));
+//    qDebug() << "======== updateNetWMAtoms";
+}
+
+// update the virtual roots array
+void QXcbWMSupport::updateVirtualRoots()
+{
+    net_virtual_roots.clear();
+
+    if (!isSupportedByWM(atom(QXcbAtom::_NET_VIRTUAL_ROOTS)))
+        return;
+
+    xcb_window_t root = connection()->screens().at(connection()->primaryScreen())->root();
+    int offset = 0;
+    int remaining = 0;
+    do {
+        xcb_generic_error_t *error = 0;
+        xcb_get_property_cookie_t cookie = xcb_get_property(xcb_connection(), false, root, atom(QXcbAtom::_NET_VIRTUAL_ROOTS), QXcbAtom::XA_ATOM, offset, 1024);
+        xcb_get_property_reply_t *reply = xcb_get_property_reply(xcb_connection(), cookie, &error);
+        if (!reply || error)
+            break;
+
+        remaining = 0;
+
+        if (reply->type == QXcbAtom::XA_ATOM && reply->format == 32) {
+            int len = xcb_get_property_value_length(reply)/4;
+            xcb_atom_t *atoms = (xcb_atom_t *)xcb_get_property_value(reply);
+            int s = net_wm_atoms.size();
+            net_wm_atoms.resize(s + len);
+            memcpy(net_wm_atoms.data() + s, atoms, len*sizeof(xcb_atom_t));
+
+            remaining = reply->bytes_after;
+            offset += len;
+        }
+
+        free(reply);
+    } while (remaining > 0);
+
+    qDebug() << "======== updateVirtualRoots";
+    for (int i = 0; i < net_virtual_roots.size(); ++i)
+        qDebug() << connection()->atomName(net_virtual_roots.at(i));
+    qDebug() << "======== updateVirtualRoots";
+}
+