kde-workspace/kcontrol/componentchooser/componentchooserwm.cpp

/***************************************************************************
                          componentchooserwm.cpp  -  description
                             -------------------
    copyright            : (C) 2002 by Joseph Wenninger
    email                : jowenn@kde.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License verstion 2 as    *
 *   published by the Free Software Foundation                             *
 *                                                                         *
 ***************************************************************************/

#include "componentchooserwm.h"
#include "moc_componentchooserwm.cpp"

#include <kdebug.h>
#include <kdesktopfile.h>
#include <kmessagebox.h>
#include <kstandarddirs.h>
#include <ktimerdialog.h>
#include <qprocess.h>
#include <qelapsedtimer.h>
#include <qdbusinterface.h>
#include <qdbusconnectioninterface.h>
#include <netwm.h>
#include <qx11info_x11.h>

CfgWm::CfgWm(QWidget *parent)
: QWidget(parent)
, Ui::WmConfig_UI()
, CfgPlugin()
{
    setupUi(this);
    connect(wmCombo,SIGNAL(activated(int)), this, SLOT(configChanged()));
    connect(kwinRB,SIGNAL(toggled(bool)),this,SLOT(configChanged()));
    connect(differentRB,SIGNAL(toggled(bool)),this,SLOT(configChanged()));
    connect(differentRB,SIGNAL(toggled(bool)),this,SLOT(checkConfigureWm()));
    connect(wmCombo,SIGNAL(activated(int)),this,SLOT(checkConfigureWm()));
    connect(configureButton,SIGNAL(clicked()),this,SLOT(configureWm()));

    KGlobal::dirs()->addResourceType( "windowmanagers", "data", "ksmserver/windowmanagers" );
}

CfgWm::~CfgWm()
{
}

void CfgWm::configChanged()
{
    emit changed(true);
}

void CfgWm::defaults()
{
    wmCombo->setCurrentIndex( 0 );
}


void CfgWm::load(KConfig *)
{
    KConfig cfg("ksmserverrc", KConfig::NoGlobals);
    KConfigGroup c( &cfg, "General");
    loadWMs(c.readEntry("windowManager", "kwin"));
    emit changed(false);
}

void CfgWm::save(KConfig *)
{
    saveAndConfirm();
}

bool CfgWm::saveAndConfirm()
{
    KConfig cfg("ksmserverrc", KConfig::NoGlobals);
    KConfigGroup c( &cfg, "General");
    c.writeEntry("windowManager", currentWm());
    emit changed(false);
    if( oldwm == currentWm())
        return true;
    QString restartArgument = currentWmData().restartArgument;
    if( restartArgument.isEmpty())
    {
        KMessageBox::information( this,
            i18n( "The new window manager will be used when KDE is started the next time." ),
            i18n( "Window Manager Change" ), "windowmanagerchange" );
        oldwm = currentWm();
        return true;
    }
    else
    {
        if( tryWmLaunch())
        {
            oldwm = currentWm();
            cfg.sync();
            QDBusInterface ksmserver("org.kde.ksmserver", "/KSMServer" );
            ksmserver.call( QDBus::NoBlock, "wmChanged" );
            KMessageBox::information( window(),
                i18n( "A new window manager is running.\n"
                    "It is still recommended to restart this KDE session to make sure "
                    "all running applications adjust for this change." ),
                    i18n( "Window Manager Replaced" ), "restartafterwmchange" );
            return true;
        }
        else
        { // revert config
            emit changed(true);
            c.writeEntry("windowManager", oldwm);
            if( oldwm == "kwin" )
            {
                kwinRB->setChecked( true );
                wmCombo->setEnabled( false );
            }
            else
            {
                differentRB->setChecked( true );
                wmCombo->setEnabled( true );
                for( QHash< QString, WmData >::ConstIterator it = wms.constBegin();
                     it != wms.constEnd();
                     ++it )
                {
                    if( (*it).internalName == oldwm ) // make it selected
                        wmCombo->setCurrentIndex( wmCombo->findText( it.key()));
                }
            }
            return false;
        }
    }
}

bool CfgWm::tryWmLaunch()
{
    if( currentWm() == "kwin"
        && qstrcmp( NETRootInfo( QX11Info::display(), NET::SupportingWMCheck ).wmName(), "KWin" ) == 0 )
    {
        return true; // it is already running, don't necessarily restart e.g. after a failure with other WM
    }
    KMessageBox::information( window(), i18n( "Your running window manager will be now replaced with "
        "the configured one." ), i18n( "Window Manager Change" ), "windowmanagerchange" );

    bool ret = false;
    if (QProcess::startDetached( currentWmData().exec, QStringList() << currentWmData().restartArgument )) {
        // assume it's forked into background
        ret = true;

        if (currentWmData().internalName == "openbox") {
            // HACK: forked but not operational yet, wait 2sec otherwise the timer dialog may not
            // show up and the configuration window becomes non-interactive until the timeout is
            // reached
            QElapsedTimer workaround;
            workaround.start();
            while (workaround.elapsed() < 2000) {
                QCoreApplication::processEvents();
            }
        }

        KTimerDialog* wmDialog = new KTimerDialog( 20000, KTimerDialog::CountDown, window(), i18n( "Config Window Manager Change" ),
            KTimerDialog::Ok | KTimerDialog::Cancel, KTimerDialog::Cancel );
        wmDialog->setButtonGuiItem( KDialog::Ok, KGuiItem( i18n( "&Accept Change" ), "dialog-ok" ));
        wmDialog->setButtonGuiItem( KDialog::Cancel, KGuiItem( i18n( "&Revert to Previous" ), "dialog-cancel" ));
        QLabel *label = new QLabel(
            i18n( "The configured window manager is being launched.\n"
                "Please check it has started properly and confirm the change.\n"
                "The launch will be automatically reverted in 20 seconds." ), wmDialog );
        label->setWordWrap( true );
        wmDialog->setMainWidget( label );

        if ( wmDialog->exec() != QDialog::Accepted ) {
            // cancelled for some reason
            ret = false;

            KMessageBox::sorry( window(),
                i18n( "The running window manager has been reverted to the previous window manager." ));
        }

        delete wmDialog;
        wmDialog = NULL;
    } else {
        ret = false;

        KMessageBox::sorry( window(),
            i18n( "The new window manager has failed to start.\n"
            "The running window manager has been reverted to the previous window manager." ));
    }

    if (!ret) {
        // case-insensitive search
        foreach (const QString &wmkey, wms.keys()) {
            if (wmkey.toLower() == oldwm) {
                WmData oldwmdata = wms.value(wmkey);
                QProcess::startDetached( oldwmdata.exec, QStringList() << oldwmdata.restartArgument );

                break;
            }
        }
    }

    return ret;
}

void CfgWm::loadWMs( const QString& current )
{
    WmData kwin;
    kwin.internalName = "kwin";
    kwin.exec = "kwin";
    kwin.configureCommand = "";
    kwin.restartArgument = "--replace";
    kwin.parentArgument = "";
    wms[ "KWin" ] = kwin;
    oldwm = "kwin";
    kwinRB->setChecked( true );
    wmCombo->setEnabled( false );

    QStringList list = KGlobal::dirs()->findAllResources( "windowmanagers", QString(), KStandardDirs::NoDuplicates );
    QRegExp reg( ".*/([^/\\.]*)\\.[^/\\.]*" );
    foreach( const QString& wmfile, list )
    {
        KDesktopFile file( wmfile );
        if( file.noDisplay())
            continue;
        if( !file.tryExec())
            continue;
        QString testexec = file.desktopGroup().readEntry( "X-KDE-WindowManagerTestExec" );
        if( !testexec.isEmpty())
        {
            if( QProcess::execute(testexec) != 0 )
                continue;
        }
        QString name = file.readName();
        if( name.isEmpty())
            continue;
        if( !reg.exactMatch( wmfile ))
            continue;
        QString wm = reg.cap( 1 );
        if( wms.contains( name ))
            continue;
        WmData data;
        data.internalName = wm;
        data.exec = file.desktopGroup().readEntry( "Exec" );
        if( data.exec.isEmpty())
            continue;
        data.configureCommand = file.desktopGroup().readEntry( "X-KDE-WindowManagerConfigure" );
        data.restartArgument = file.desktopGroup().readEntry( "X-KDE-WindowManagerRestartArgument" );
        data.parentArgument = file.desktopGroup().readEntry( "X-KDE-WindowManagerConfigureParentArgument" );
        wms[ name ] = data;
        wmCombo->addItem( name );
        if( wms[ name ].internalName == current ) // make it selected
        {
            wmCombo->setCurrentIndex( wmCombo->count() - 1 );
            oldwm = wm;
            differentRB->setChecked( true );
            wmCombo->setEnabled( true );
        }
    }
    differentRB->setEnabled( wmCombo->count()>0 );
    checkConfigureWm();
}

CfgWm::WmData CfgWm::currentWmData() const
{
    return kwinRB->isChecked() ? wms[ "KWin" ] : wms[ wmCombo->currentText() ];
}

QString CfgWm::currentWm() const
{
    return currentWmData().internalName;
}

void CfgWm::checkConfigureWm()
{
    configureButton->setEnabled( !currentWmData().configureCommand.isEmpty());
}

void CfgWm::configureWm()
{
    if( oldwm != currentWm() // needs switching first
        && !saveAndConfirm())
    {
        return;
    }
    QStringList args;
    if( !currentWmData().parentArgument.isEmpty())
        args << currentWmData().parentArgument << QString::number( window()->winId());
    if( !QProcess::startDetached( currentWmData().configureCommand, args ))
        KMessageBox::sorry( window(), i18n( "Running the configuration tool failed" ));
}