kcmoduleproxy.cpp

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/*  This file is part of the KDE project
    Copyright (C) 2004 Frans Englich <frans.englich@telia.com>
    Copyright (C) 2003 Matthias Kretz <kretz@kde.org>

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

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "kcmoduleproxy.h"
#include "kcmoduleproxy_p.h"

#include <QtGui/QApplication>
#include <QtGui/QCursor>
#include <QtCore/QDataStream>
#include <QtGui/QKeyEvent>
#include <QtCore/QFileInfo>
#include <QtGui/QFrame>
#include <QtGui/QLabel>
#include <QtGui/QLayout>
#include <QtCore/QPoint>

#include <QtGui/QImage>

#include <QtDBus/QtDBus>

#include <kaboutdata.h>
#include <kcmodule.h>
#include <kcmoduleinfo.h>

#include <kdebug.h>
#include <kdialog.h>
#include <klocale.h>
#include <kservice.h>
#include <kstandarddirs.h>
#include <kuser.h>

#include <kvbox.h>

#include <kcmoduleloader.h>

#include "kcolorscheme.h"

#include "ksettingswidgetadaptor.h"

/*
 TODO:

 - Two Layout problems in runAsRoot:
    * lblBusy doesn't show
    * d->kcm/d->rootInfo doesn't get it right when the user
        presses cancel in the kdesu dialog

 - Resizing horizontally is contrained; minimum size is set somewhere.
    It appears to be somehow derived from the module's size.

 - Prettify: set icon in KCMultiDialog.

 */
/***************************************************************/
KCModule* KCModuleProxy::realModule() const
{
    Q_D(const KCModuleProxy);
    /*
     * Note, don't call any function that calls realModule() since
     * that leads to an infinite loop.
     */

    /* Already loaded */
    if( !d->kcm )
    {
        QApplication::setOverrideCursor( Qt::WaitCursor );
        const_cast<KCModuleProxyPrivate *>(d)->loadModule();
        QApplication::restoreOverrideCursor();
    }
    return d->kcm;
}

void KCModuleProxyPrivate::loadModule()
{
    if( !topLayout )
    {
        topLayout = new QVBoxLayout( parent );
        topLayout->setMargin( 0 );

        QString name = modInfo.handle();
        dbusPath = QLatin1String("/internal/KSettingsWidget/") + name;
        dbusService = QLatin1String("org.kde.internal.KSettingsWidget-") + name;
    }

    if( QDBusConnection::sessionBus().registerService( dbusService ) || bogusOccupier )
    { /* We got the name we requested, because no one was before us,
       * or, it was an random application which had picked that name */
        kDebug(711) << "Module not already loaded, loading module " << modInfo.moduleName() << " from library " << modInfo.library() << " using symbol " << modInfo.handle();

        kcm = KCModuleLoader::loadModule( modInfo, KCModuleLoader::Inline, parent, args );

        QObject::connect(kcm, SIGNAL(changed(bool)), parent, SLOT(_k_moduleChanged(bool)));
        QObject::connect(kcm, SIGNAL(destroyed()), parent, SLOT(_k_moduleDestroyed()));
        QObject::connect( kcm, SIGNAL(quickHelpChanged()), parent, SIGNAL(quickHelpChanged()) );
        parent->setWhatsThis( kcm->quickHelp() );

        if ( kcm->layout() ) {
            kcm->layout()->setMargin( 0 );
        }
        topLayout->addWidget( kcm );
        if( !modInfo.handle().isEmpty() )
            QDBusConnection::sessionBus().registerObject(dbusPath, new KSettingsWidgetAdaptor(parent), QDBusConnection::ExportAllSlots);

        if ( !rootInfo && /* If it's not already done */
                kcm->useRootOnlyMessage() && /* kcm wants root message */
                !KUser().isSuperUser() ) /* Not necessary if we're root */
        {
            /*rootInfo = new QLabel( parent );
            topLayout->insertWidget( 0, rootInfo );
            
            QPalette palette = rootInfo->palette();
            KStatefulBrush stbrush(KColorScheme::Window, KColorScheme::NeutralBackground);
            qDebug() << stbrush.brush(rootInfo);
            palette.setBrush(QPalette::Window, stbrush.brush(rootInfo));
            rootInfo->setPalette(palette);
            rootInfo->setAutoFillBackground(true);

            const QString message = kcm->rootOnlyMessage();
            if( message.isEmpty() )
                rootInfo->setText( i18n(
                      "<b>Changes in this section require root access.</b><br />"
                      "On applying your changes you will have to supply your root "
                      "password." ) );
            else
                rootInfo->setText(message);

            rootInfo->setWhatsThis( i18n(
                  "This section requires special permissions, probably "
                  "for system-wide changes; therefore, it is "
                  "required that you provide the root password to be "
                  "able to change the module's properties. If "
                  "you cannot provide the password, the changes of the "
                  "module cannot be saved " ) );*/
        }
    }
    else
    {
        kDebug(711) << "Module already loaded, loading KCMError";

        /* Figure out the name of where the module is already loaded */
        QDBusInterface proxy( dbusService, dbusPath, "org.kde.internal.KSettingsWidget" );
        QDBusReply<QString> reply = proxy.call("applicationName");

        if( reply.isValid() )
        {
            QObject::connect( QDBusConnection::sessionBus().interface(), SIGNAL(serviceOwnerChanged(QString,QString,QString)),
                    parent, SLOT(_k_ownerChanged(QString,QString,QString)));
            kcm = KCModuleLoader::reportError( KCModuleLoader::Inline,
                    i18nc( "Argument is application name", "This configuration section is "
                        "already opened in %1" ,  reply.value() ), " ", parent );
            topLayout->addWidget( kcm );
        }
        else
        {
            kDebug(711) << "Calling KCModuleProxy's DBus interface for fetching the name failed.";
            bogusOccupier = true;
            loadModule();
        }
    }
}

void KCModuleProxyPrivate::_k_ownerChanged(const QString &service, const QString &oldOwner, const QString &)
{
    if (service == dbusService && !oldOwner.isEmpty()) {
        // Violence: Get rid of KCMError & CO, so that
        // realModule() attempts to reload the module
        delete kcm;
        kcm = 0;
        Q_Q(KCModuleProxy);
        q->realModule();

        Q_ASSERT(kcm);
        kcm->show();
    }
}

void KCModuleProxy::showEvent( QShowEvent * ev )
{
    Q_D(KCModuleProxy);

    ( void )realModule();

    /* We have no kcm, if we're in root mode */
    if( d->kcm ) {
        d->kcm->showEvent(ev);
    }

    QWidget::showEvent( ev );

}

KCModuleProxy::~KCModuleProxy()
{
    deleteClient();
    KCModuleLoader::unloadModule(moduleInfo());

    delete d_ptr;
}

void KCModuleProxy::deleteClient()
{
    Q_D(KCModuleProxy);
    delete d->kcm;
    d->kcm = 0;

    qApp->syncX();
}

void KCModuleProxyPrivate::_k_moduleChanged(bool c)
{
    if(changed == c) {
        return;
    }

    Q_Q(KCModuleProxy);
    changed = c;
    emit q->changed(c);
    emit q->changed(q);
}

void KCModuleProxyPrivate::_k_moduleDestroyed()
{
    kcm = 0;
}

KCModuleProxy::KCModuleProxy( const KService::Ptr& service, QWidget * parent,
        const QStringList& args )
    : QWidget(parent), d_ptr(new KCModuleProxyPrivate(this, KCModuleInfo(service), args))
{
    d_ptr->q_ptr = this;
}

KCModuleProxy::KCModuleProxy( const KCModuleInfo& info, QWidget * parent,
        const QStringList& args )
    : QWidget(parent), d_ptr(new KCModuleProxyPrivate(this, info, args))
{
    d_ptr->q_ptr = this;
}

KCModuleProxy::KCModuleProxy( const QString& serviceName, QWidget * parent,
        const QStringList& args )
    : QWidget(parent), d_ptr(new KCModuleProxyPrivate(this, KCModuleInfo(serviceName), args))
{
    d_ptr->q_ptr = this;
}


void KCModuleProxy::load()
{
    Q_D(KCModuleProxy);
    if( realModule() )
    {
        d->kcm->load();
        d->_k_moduleChanged(false);
    }
}

void KCModuleProxy::save()
{
    Q_D(KCModuleProxy);
    if( d->changed && realModule() )
    {
        d->kcm->save();
        d->_k_moduleChanged(false);
    }
}

void KCModuleProxy::defaults()
{
    Q_D(KCModuleProxy);
    if( realModule() )
        d->kcm->defaults();
}

QString KCModuleProxy::quickHelp() const
{
    return realModule() ? realModule()->quickHelp() : QString();
}

const KAboutData * KCModuleProxy::aboutData() const
{
    return realModule() ? realModule()->aboutData() : 0;
}

KCModule::Buttons KCModuleProxy::buttons() const
{
    if( realModule() )
        return realModule()->buttons();
    return KCModule::Buttons( KCModule::Help | KCModule::Default | KCModule::Apply );
}

QString KCModuleProxy::rootOnlyMessage() const
{
    return realModule() ? realModule()->rootOnlyMessage() : QString();
}

bool KCModuleProxy::useRootOnlyMessage() const
{
    return realModule() ? realModule()->useRootOnlyMessage() : true;
}

KComponentData KCModuleProxy::componentData() const
{
    return realModule() ? realModule()->componentData() : KComponentData();
}

bool KCModuleProxy::changed() const
{
    Q_D(const KCModuleProxy);
    return d->changed;
}

KCModuleInfo KCModuleProxy::moduleInfo() const
{
    Q_D(const KCModuleProxy);
    return d->modInfo;
}

QString KCModuleProxy::dbusService() const
{
    Q_D(const KCModuleProxy);
    return d->dbusService;
}

QString KCModuleProxy::dbusPath() const
{
    Q_D(const KCModuleProxy);
    return d->dbusPath;
}

QSize KCModuleProxy::minimumSizeHint() const
{
    return QWidget::minimumSizeHint();
}

//X void KCModuleProxy::emitQuickHelpChanged()
//X {
//X     emit quickHelpChanged();
//X }

/***************************************************************/
#include "kcmoduleproxy.moc"

// vim: ts=4