vcl/unx/kde4/VCLKDEApplication.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "VCLKDEApplication.hxx"
  21
  22 #include <QtGui/QClipboard>
  23 #include <QtCore/QEvent>
  24
  25 #include "KDESalDisplay.hxx"
  26
  27 VCLKDEApplication::VCLKDEApplication() :
  28     KApplication()
  29 {
  30 }
  31
  32 bool VCLKDEApplication::x11EventFilter(XEvent* ev)
  33 {
  34     //if we have a display and the display consumes the event
  35     //do not process the event in qt
  36     if (SalKDEDisplay::self() && SalKDEDisplay::self()->Dispatch(ev))
  37     {
  38         return true;
  39     }
  40
  41     return false;
  42 }
  43
  44 // various hacks to be performed before re-entering Qt's event loop
  45 // because of showing a Qt dialog
  46 void VCLKDEApplication::preDialogSetup()
  47 {
  48     // KFileDialog integration requires using event loop with QClipboard.
  49     // Opening the KDE file dialog here can lead to QClipboard
  50     // asking for clipboard contents. If LO core is the owner of the clipboard
  51     // content, without event loop use this will block for 5 seconds and timeout,
  52     // since the clipboard thread will not be able to acquire SolarMutex
  53     // and thus won't be able to respond. If the event loops
  54     // are properly integrated and QClipboard can use a nested event loop
  55     // (see the KDE VCL plug), then this won't happen.
  56     // We cannot simply release SolarMutex here, because the event loop started
  57     // by the file dialog would also call back to LO code.
  58     assert( QApplication::clipboard()->property( "useEventLoopWhenWaiting" ).toBool() );
  59 }
  60
  61 // various hacks to be performed after a Qt dialog has been closed
  62 void VCLKDEApplication::postDialogCleanup()
  63 {
  64     // HACK: KFileDialog uses KConfig("kdeglobals") for saving some settings
  65     // (such as the auto-extension flag), but that doesn't update KGlobal::config()
  66     // (which is probably a KDE bug), so force reading the new configuration,
  67     // otherwise the next opening of the dialog would use the old settings.
  68     KGlobal::config()->reparseConfiguration();
  69     // HACK: If Qt owns clipboard or selection, give up on their ownership now. Otherwise
  70     // LO core might ask for the contents, but it would block while doing so (i.e. it
  71     // doesn't seem to have an equivalent of QClipboard's "useEventLoopWhenWaiting"),
  72     // therefore QClipboard wouldn't be able to respond, and whole LO would block until
  73     // a timeout. Given that Klipper is most probably running, giving up clipboard/selection
  74     // ownership will not only avoid the blocking, but even pasting that content in LO
  75     // will in fact work, if Klipper can handle it.
  76     // Technically proper solution would be of course to allow Qt to process QClipboard
  77     // events while LO waits for clipboard contents, or short-circuit to QClipboard somehow
  78     // (it's a mystery why LO's clipboard handling has its own thread when whole LO can
  79     // get blocked by both trying to send and receive clipboard contents anyway).
  80     QClipboard* clipboard = QApplication::clipboard();
  81     if( clipboard->ownsSelection())
  82         clipboard->clear( QClipboard::Selection );
  83     if( clipboard->ownsClipboard())
  84         clipboard->clear();
  85 }
  86
  87 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */