ViewManager.cpp

/*
    Copyright 2006-2008 by Robert Knight <robertknight@gmail.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

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

// Own
#include "ViewManager.h"

#include <config-konsole.h>

// Qt
#include <QtCore/QSignalMapper>
#include <QtCore/QStringList>
#include <QAction>
#include <QtDBus/QtDBus>

// KDE
#include <KAcceleratorManager>
#include <KLocalizedString>
#include <KActionCollection>
#include <KConfigGroup>

// Konsole
#include <windowadaptor.h>

#include "ColorScheme.h"
#include "ColorSchemeManager.h"
#include "Session.h"
#include "TerminalDisplay.h"
#include "SessionController.h"
#include "SessionManager.h"
#include "ProfileManager.h"
#include "ViewSplitter.h"
#include "Enumeration.h"

using namespace Konsole;

int ViewManager::lastManagerId = 0;

ViewManager::ViewManager(QObject* parent , KActionCollection* collection)
    : QObject(parent)
    , _viewSplitter(0)
    , _actionCollection(collection)
    , _containerSignalMapper(new QSignalMapper(this))
    , _navigationMethod(TabbedNavigation)
    , _navigationVisibility(ViewContainer::AlwaysShowNavigation)
    , _navigationPosition(ViewContainer::NavigationPositionTop)
    , _showQuickButtons(false)
    , _newTabBehavior(PutNewTabAtTheEnd)
    , _navigationStyleSheet(QString())
    , _managerId(0)
{
    // create main view area
    _viewSplitter = new ViewSplitter(0);
    KAcceleratorManager::setNoAccel(_viewSplitter);

    // the ViewSplitter class supports both recursive and non-recursive splitting,
    // in non-recursive mode, all containers are inserted into the same top-level splitter
    // widget, and all the divider lines between the containers have the same orientation
    //
    // the ViewManager class is not currently able to handle a ViewSplitter in recursive-splitting
    // mode
    _viewSplitter->setRecursiveSplitting(false);
    _viewSplitter->setFocusPolicy(Qt::NoFocus);

    // setup actions which are related to the views
    setupActions();

    // emit a signal when all of the views held by this view manager are destroyed
    connect(_viewSplitter.data() , &Konsole::ViewSplitter::allContainersEmpty , this , &Konsole::ViewManager::empty);
    connect(_viewSplitter.data() , &Konsole::ViewSplitter::empty , this , &Konsole::ViewManager::empty);

    // listen for addition or removal of views from associated containers
    connect(_containerSignalMapper , static_cast<void(QSignalMapper::*)(QObject*)>(&QSignalMapper::mapped) , this , &Konsole::ViewManager::containerViewsChanged);

    // listen for profile changes
    connect(ProfileManager::instance() , &Konsole::ProfileManager::profileChanged , this, &Konsole::ViewManager::profileChanged);
    connect(SessionManager::instance() , &Konsole::SessionManager::sessionUpdated , this, &Konsole::ViewManager::updateViewsForSession);

    //prepare DBus communication
    new WindowAdaptor(this);

    _managerId = ++lastManagerId;
    QDBusConnection::sessionBus().registerObject(QLatin1String("/Windows/") + QString::number(_managerId), this);
}

ViewManager::~ViewManager()
{
}

int ViewManager::managerId() const
{
    return _managerId;
}

QWidget* ViewManager::activeView() const
{
    ViewContainer* container = _viewSplitter->activeContainer();
    if (container) {
        return container->activeView();
    } else {
        return 0;
    }
}

QWidget* ViewManager::widget() const
{
    return _viewSplitter;
}

void ViewManager::setupActions()
{
    KActionCollection* collection = _actionCollection;

    QAction* nextViewAction = new QAction(i18nc("@action Shortcut entry", "Next Tab") , this);
    QAction* previousViewAction = new QAction(i18nc("@action Shortcut entry", "Previous Tab") , this);
    QAction* lastViewAction = new QAction(i18nc("@action Shortcut entry", "Switch to Last Tab") , this);
    QAction* nextContainerAction = new QAction(i18nc("@action Shortcut entry", "Next View Container") , this);

    QAction* moveViewLeftAction = new QAction(i18nc("@action Shortcut entry", "Move Tab Left") , this);
    QAction* moveViewRightAction = new QAction(i18nc("@action Shortcut entry", "Move Tab Right") , this);

    // list of actions that should only be enabled when there are multiple view
    // containers open
    QList<QAction*> multiViewOnlyActions;
    multiViewOnlyActions << nextContainerAction;

    if (collection) {
        QAction* splitLeftRightAction = new QAction(QIcon::fromTheme(QStringLiteral("view-split-left-right")),
                i18nc("@action:inmenu", "Split View Left/Right"),
                this);
        collection->setDefaultShortcut(splitLeftRightAction, Qt::CTRL + Qt::Key_ParenLeft);
        collection->addAction("split-view-left-right", splitLeftRightAction);
        connect(splitLeftRightAction , &QAction::triggered , this , &Konsole::ViewManager::splitLeftRight);

        QAction* splitTopBottomAction = new QAction(QIcon::fromTheme(QStringLiteral("view-split-top-bottom")) ,
                i18nc("@action:inmenu", "Split View Top/Bottom"), this);
        collection->setDefaultShortcut(splitTopBottomAction, Qt::CTRL + Qt::Key_ParenRight);
        collection->addAction("split-view-top-bottom", splitTopBottomAction);
        connect(splitTopBottomAction , &QAction::triggered , this , &Konsole::ViewManager::splitTopBottom);

        QAction* closeActiveAction = new QAction(i18nc("@action:inmenu Close Active View", "Close Active") , this);
        closeActiveAction->setIcon(QIcon::fromTheme(QStringLiteral("view-close")));
        collection->setDefaultShortcut(closeActiveAction, Qt::CTRL + Qt::SHIFT + Qt::Key_S);
        closeActiveAction->setEnabled(false);
        collection->addAction("close-active-view", closeActiveAction);
        connect(closeActiveAction , &QAction::triggered , this , &Konsole::ViewManager::closeActiveContainer);

        multiViewOnlyActions << closeActiveAction;

        QAction* closeOtherAction = new QAction(i18nc("@action:inmenu Close Other Views", "Close Others") , this);
        collection->setDefaultShortcut(closeOtherAction, Qt::CTRL + Qt::SHIFT + Qt::Key_O);
        closeOtherAction->setEnabled(false);
        collection->addAction("close-other-views", closeOtherAction);
        connect(closeOtherAction , &QAction::triggered , this , &Konsole::ViewManager::closeOtherContainers);

        multiViewOnlyActions << closeOtherAction;

        // Expand & Shrink Active View
        QAction* expandActiveAction = new QAction(i18nc("@action:inmenu", "Expand View") , this);
        collection->setDefaultShortcut(expandActiveAction, Qt::CTRL + Qt::SHIFT + Qt::Key_BracketRight);
        expandActiveAction->setEnabled(false);
        collection->addAction("expand-active-view", expandActiveAction);
        connect(expandActiveAction , &QAction::triggered , this , &Konsole::ViewManager::expandActiveContainer);

        multiViewOnlyActions << expandActiveAction;

        QAction* shrinkActiveAction = new QAction(i18nc("@action:inmenu", "Shrink View") , this);
        collection->setDefaultShortcut(shrinkActiveAction, Qt::CTRL + Qt::SHIFT + Qt::Key_BracketLeft);
        shrinkActiveAction->setEnabled(false);
        collection->addAction("shrink-active-view", shrinkActiveAction);
        connect(shrinkActiveAction , &QAction::triggered , this , &Konsole::ViewManager::shrinkActiveContainer);

        multiViewOnlyActions << shrinkActiveAction;

#if defined(ENABLE_DETACHING)
        QAction* detachViewAction = collection->addAction("detach-view");
        detachViewAction->setIcon(QIcon::fromTheme(QStringLiteral("tab-detach")));
        detachViewAction->setText(i18nc("@action:inmenu", "D&etach Current Tab"));
        // Ctrl+Shift+D is not used as a shortcut by default because it is too close
        // to Ctrl+D - which will terminate the session in many cases
        collection->setDefaultShortcut(detachViewAction, Qt::CTRL + Qt::SHIFT + Qt::Key_H);

        connect(this , &Konsole::ViewManager::splitViewToggle , this , &Konsole::ViewManager::updateDetachViewState);
        connect(detachViewAction , &QAction::triggered , this , &Konsole::ViewManager::detachActiveView);
#endif

        // Next / Previous View , Next Container
        collection->addAction("next-view", nextViewAction);
        collection->addAction("previous-view", previousViewAction);
        collection->addAction("last-tab", lastViewAction);
        collection->addAction("next-container", nextContainerAction);
        collection->addAction("move-view-left", moveViewLeftAction);
        collection->addAction("move-view-right", moveViewRightAction);

        // Switch to tab N shortcuts
        const int SWITCH_TO_TAB_COUNT = 19;
        QSignalMapper* switchToTabMapper = new QSignalMapper(this);
        connect(switchToTabMapper, static_cast<void(QSignalMapper::*)(int)>(&QSignalMapper::mapped), this, &Konsole::ViewManager::switchToView);
        for (int i = 0; i < SWITCH_TO_TAB_COUNT; i++) {
            QAction* switchToTabAction = new QAction(i18nc("@action Shortcut entry", "Switch to Tab %1", i + 1), this);
            switchToTabMapper->setMapping(switchToTabAction, i);
            connect(switchToTabAction, &QAction::triggered, switchToTabMapper, static_cast<void(QSignalMapper::*)()>(&QSignalMapper::map));
            collection->addAction(QString("switch-to-tab-%1").arg(i), switchToTabAction);
        }
    }

    foreach(QAction* action, multiViewOnlyActions) {
        connect(this , &Konsole::ViewManager::splitViewToggle , action , &QAction::setEnabled);
    }

    // keyboard shortcut only actions
    collection->setDefaultShortcut(nextViewAction, Qt::SHIFT + Qt::Key_Right);
    connect(nextViewAction, &QAction::triggered , this , &Konsole::ViewManager::nextView);
    _viewSplitter->addAction(nextViewAction);

    collection->setDefaultShortcut(previousViewAction, Qt::SHIFT + Qt::Key_Left);
    connect(previousViewAction, &QAction::triggered , this , &Konsole::ViewManager::previousView);
    _viewSplitter->addAction(previousViewAction);

    collection->setDefaultShortcut(nextContainerAction, Qt::SHIFT + Qt::Key_Tab);
    connect(nextContainerAction , &QAction::triggered , this , &Konsole::ViewManager::nextContainer);
    _viewSplitter->addAction(nextContainerAction);

    collection->setDefaultShortcut(moveViewLeftAction, Qt::CTRL + Qt::SHIFT + Qt::Key_Left);
    connect(moveViewLeftAction , &QAction::triggered , this , &Konsole::ViewManager::moveActiveViewLeft);
    _viewSplitter->addAction(moveViewLeftAction);

    collection->setDefaultShortcut(moveViewRightAction, Qt::CTRL + Qt::SHIFT + Qt::Key_Right);
    connect(moveViewRightAction , &QAction::triggered , this , &Konsole::ViewManager::moveActiveViewRight);
    _viewSplitter->addAction(moveViewRightAction);

    connect(lastViewAction, &QAction::triggered , this , &Konsole::ViewManager::lastView);
    _viewSplitter->addAction(lastViewAction);
}
void ViewManager::switchToView(int index)
{
    Q_ASSERT(index >= 0);
    ViewContainer* container = _viewSplitter->activeContainer();
    Q_ASSERT(container);
    QList<QWidget*> containerViews = container->views();
    if (index >= containerViews.count())
        return;
    container->setActiveView(containerViews.at(index));
}
void ViewManager::updateDetachViewState()
{
    if (!_actionCollection)
        return;

    const bool splitView = _viewSplitter->containers().count() >= 2;
    auto activeContainer = _viewSplitter->activeContainer();
    const bool shouldEnable = splitView || (activeContainer && activeContainer->views().count() >= 2);

    QAction* detachAction = _actionCollection->action("detach-view");

    if (detachAction && shouldEnable != detachAction->isEnabled())
        detachAction->setEnabled(shouldEnable);
}
void ViewManager::moveActiveViewLeft()
{
    ViewContainer* container = _viewSplitter->activeContainer();
    Q_ASSERT(container);
    container->moveActiveView(ViewContainer::MoveViewLeft);
}
void ViewManager::moveActiveViewRight()
{
    ViewContainer* container = _viewSplitter->activeContainer();
    Q_ASSERT(container);
    container->moveActiveView(ViewContainer::MoveViewRight);
}
void ViewManager::nextContainer()
{
    _viewSplitter->activateNextContainer();
}

void ViewManager::nextView()
{
    ViewContainer* container = _viewSplitter->activeContainer();

    Q_ASSERT(container);

    container->activateNextView();
}

void ViewManager::previousView()
{
    ViewContainer* container = _viewSplitter->activeContainer();

    Q_ASSERT(container);

    container->activatePreviousView();
}

void ViewManager::lastView()
{
    ViewContainer* container = _viewSplitter->activeContainer();

    Q_ASSERT(container);

    container->activateLastView();
}

void ViewManager::detachActiveView()
{
    // find the currently active view and remove it from its container
    ViewContainer* container = _viewSplitter->activeContainer();

    detachView(container, container->activeView());
}

void ViewManager::detachView(ViewContainer* container, QWidget* widgetView)
{
#if !defined(ENABLE_DETACHING)
    return;
#endif

    TerminalDisplay * viewToDetach = qobject_cast<TerminalDisplay*>(widgetView);

    if (!viewToDetach)
        return;

    emit viewDetached(_sessionMap[viewToDetach]);

    _sessionMap.remove(viewToDetach);

    // remove the view from this window
    container->removeView(viewToDetach);
    viewToDetach->deleteLater();

    // if the container from which the view was removed is now empty then it can be deleted,
    // unless it is the only container in the window, in which case it is left empty
    // so that there is always an active container
    if (_viewSplitter->containers().count() > 1 &&
            container->views().count() == 0) {
        removeContainer(container);
    }
}

void ViewManager::sessionFinished()
{
    // if this slot is called after the view manager's main widget
    // has been destroyed, do nothing
    if (!_viewSplitter)
        return;

    Session* session = qobject_cast<Session*>(sender());
    Q_ASSERT(session);

    // close attached views
    QList<TerminalDisplay*> children = _viewSplitter->findChildren<TerminalDisplay*>();

    foreach(TerminalDisplay* view , children) {
        if (_sessionMap[view] == session) {
            _sessionMap.remove(view);
            view->deleteLater();
        }
    }

    // This is needed to remove this controller from factory() in
    // order to prevent BUG: 185466 - disappearing menu popup
    if (_pluggedController)
        emit unplugController(_pluggedController);
}

void ViewManager::viewActivated(QWidget* view)
{
    Q_ASSERT(view != 0);

    // focus the activated view, this will cause the SessionController
    // to notify the world that the view has been focused and the appropriate UI
    // actions will be plugged in.
    view->setFocus(Qt::OtherFocusReason);
}

void ViewManager::splitLeftRight()
{
    splitView(Qt::Horizontal);
}
void ViewManager::splitTopBottom()
{
    splitView(Qt::Vertical);
}

void ViewManager::splitView(Qt::Orientation orientation)
{
    ViewContainer* container = createContainer();

    // iterate over each session which has a view in the current active
    // container and create a new view for that session in a new container
    foreach(QWidget* view,  _viewSplitter->activeContainer()->views()) {
        Session* session = _sessionMap[qobject_cast<TerminalDisplay*>(view)];
        TerminalDisplay* display = createTerminalDisplay(session);
        const Profile::Ptr profile = SessionManager::instance()->sessionProfile(session);
        applyProfileToView(display, profile);
        ViewProperties* properties = createController(session, display);

        _sessionMap[display] = session;

        container->addView(display, properties);
        session->addView(display);
    }

    _viewSplitter->addContainer(container, orientation);
    emit splitViewToggle(_viewSplitter->containers().count() > 0);

    // focus the new container
    container->containerWidget()->setFocus();

    // ensure that the active view is focused after the split / unsplit
    ViewContainer* activeContainer = _viewSplitter->activeContainer();
    QWidget* activeView = activeContainer ? activeContainer->activeView() : 0;

    if (activeView)
        activeView->setFocus(Qt::OtherFocusReason);
}
void ViewManager::removeContainer(ViewContainer* container)
{
    // remove session map entries for views in this container
    foreach(QWidget* view , container->views()) {
        TerminalDisplay* display = qobject_cast<TerminalDisplay*>(view);
        Q_ASSERT(display);
        _sessionMap.remove(display);
    }

    _viewSplitter->removeContainer(container);
    container->deleteLater();

    emit splitViewToggle(_viewSplitter->containers().count() > 1);
}
void ViewManager::expandActiveContainer()
{
    _viewSplitter->adjustContainerSize(_viewSplitter->activeContainer(), 10);
}
void ViewManager::shrinkActiveContainer()
{
    _viewSplitter->adjustContainerSize(_viewSplitter->activeContainer(), -10);
}
void ViewManager::closeActiveContainer()
{
    // only do something if there is more than one container active
    if (_viewSplitter->containers().count() > 1) {
        ViewContainer* container = _viewSplitter->activeContainer();

        removeContainer(container);

        // focus next container so that user can continue typing
        // without having to manually focus it themselves
        nextContainer();
    }
}
void ViewManager::closeOtherContainers()
{
    ViewContainer* active = _viewSplitter->activeContainer();

    foreach(ViewContainer* container, _viewSplitter->containers()) {
        if (container != active)
            removeContainer(container);
    }
}

SessionController* ViewManager::createController(Session* session , TerminalDisplay* view)
{
    // create a new controller for the session, and ensure that this view manager
    // is notified when the view gains the focus
    SessionController* controller = new SessionController(session, view, this);
    connect(controller , &Konsole::SessionController::focused , this , &Konsole::ViewManager::controllerChanged);
    connect(session , &Konsole::Session::destroyed , controller , &Konsole::SessionController::deleteLater);
    connect(session , &Konsole::Session::primaryScreenInUse , controller , &Konsole::SessionController::setupPrimaryScreenSpecificActions);
    connect(session , &Konsole::Session::selectionChanged , controller , &Konsole::SessionController::selectionChanged);
    connect(view , &Konsole::TerminalDisplay::destroyed , controller , &Konsole::SessionController::deleteLater);

    // if this is the first controller created then set it as the active controller
    if (!_pluggedController)
        controllerChanged(controller);

    return controller;
}

void ViewManager::controllerChanged(SessionController* controller)
{
    if (controller == _pluggedController)
        return;

    _viewSplitter->setFocusProxy(controller->view());

    _pluggedController = controller;
    emit activeViewChanged(controller);
}

SessionController* ViewManager::activeViewController() const
{
    return _pluggedController;
}

IncrementalSearchBar* ViewManager::searchBar() const
{
    return _viewSplitter->activeSplitter()->activeContainer()->searchBar();
}

void ViewManager::createView(Session* session, ViewContainer* container, int index)
{
    // notify this view manager when the session finishes so that its view
    // can be deleted
    //
    // Use Qt::UniqueConnection to avoid duplicate connection
    connect(session, &Konsole::Session::finished, this, &Konsole::ViewManager::sessionFinished, Qt::UniqueConnection);

    TerminalDisplay* display = createTerminalDisplay(session);
    const Profile::Ptr profile = SessionManager::instance()->sessionProfile(session);
    applyProfileToView(display, profile);

    // set initial size
    const QSize& preferredSize = session->preferredSize();
    // FIXME: +1 is needed here for getting the expected rows
    // Note that the display shouldn't need to take into account the tabbar.
    // However, it appears that taking into account the tabbar is needed.
    // If tabbar is not visible, no +1 is needed here; however, depending on
    // settings/tabbar style, +2 might be needed.
    // 1st attempt at fixing the above:
    // Guess if tabbar will NOT be visible; ignore ShowNavigationAsNeeded
    int heightAdjustment = 0;
    if (_navigationVisibility != ViewContainer::AlwaysHideNavigation) {
        heightAdjustment = 2;
    }

    display->setSize(preferredSize.width(), preferredSize.height() + heightAdjustment);
    ViewProperties* properties = createController(session, display);

    _sessionMap[display] = session;
    container->addView(display, properties, index);
    session->addView(display);

    // tell the session whether it has a light or dark background
    session->setDarkBackground(colorSchemeForProfile(profile)->hasDarkBackground());

    if (container == _viewSplitter->activeContainer()) {
        container->setActiveView(display);
        display->setFocus(Qt::OtherFocusReason);
    }

    updateDetachViewState();
}

void ViewManager::createView(Session* session)
{
    // create the default container
    if (_viewSplitter->containers().count() == 0) {
        ViewContainer* container = createContainer();
        _viewSplitter->addContainer(container, Qt::Vertical);
        emit splitViewToggle(false);
    }

    // new tab will be put at the end by default.
    int index = -1;

    if (_newTabBehavior == PutNewTabAfterCurrentTab) {
        QWidget* view = activeView();
        if (view) {
            QList<QWidget*> views =  _viewSplitter->activeContainer()->views();
            index = views.indexOf(view) + 1;
        }
    }

    // iterate over the view containers owned by this view manager
    // and create a new terminal display for the session in each of them, along with
    // a controller for the session/display pair
    foreach(ViewContainer* container,  _viewSplitter->containers()) {
        createView(session, container, index);
    }
}

ViewContainer* ViewManager::createContainer()
{
    ViewContainer* container = 0;

    switch (_navigationMethod) {
    case TabbedNavigation: {
        TabbedViewContainer* tabbedContainer = new TabbedViewContainer(_navigationPosition, this, _viewSplitter);
        container = tabbedContainer;

        connect(tabbedContainer, &TabbedViewContainer::detachTab, this, &ViewManager::detachView);
        connect(tabbedContainer, &TabbedViewContainer::closeTab, this, &ViewManager::closeTabFromContainer);
    }
    break;
    case NoNavigation:
    default:
        container = new StackedViewContainer(_viewSplitter);
    }

    // FIXME: these code feels duplicated
    container->setNavigationVisibility(_navigationVisibility);
    container->setNavigationPosition(_navigationPosition);
    container->setStyleSheet(_navigationStyleSheet);
    if (_showQuickButtons) {
        container->setFeatures(container->features()
                               | ViewContainer::QuickNewView
                               | ViewContainer::QuickCloseView);
    } else {
        container->setFeatures(container->features()
                               & ~ViewContainer::QuickNewView
                               & ~ViewContainer::QuickCloseView);
    }

    // connect signals and slots
    connect(container , &Konsole::ViewContainer::viewAdded , _containerSignalMapper , static_cast<void(QSignalMapper::*)()>(&QSignalMapper::map));
    connect(container , &Konsole::ViewContainer::viewRemoved , _containerSignalMapper , static_cast<void(QSignalMapper::*)()>(&QSignalMapper::map));
    _containerSignalMapper->setMapping(container, container);

    connect(container, static_cast<void(ViewContainer::*)()>(&Konsole::ViewContainer::newViewRequest), this, static_cast<void(ViewManager::*)()>(&Konsole::ViewManager::newViewRequest));
    connect(container, static_cast<void(ViewContainer::*)(Profile::Ptr)>(&Konsole::ViewContainer::newViewRequest), this, static_cast<void(ViewManager::*)(Profile::Ptr)>(&Konsole::ViewManager::newViewRequest));
    connect(container, &Konsole::ViewContainer::moveViewRequest, this , &Konsole::ViewManager::containerMoveViewRequest);
    connect(container , &Konsole::ViewContainer::viewRemoved , this , &Konsole::ViewManager::viewDestroyed);
    connect(container , &Konsole::ViewContainer::activeViewChanged , this , &Konsole::ViewManager::viewActivated);

    return container;
}

void ViewManager::containerMoveViewRequest(int index, int id, bool& moved, TabbedViewContainer* sourceTabbedContainer)
{
    ViewContainer* container = qobject_cast<ViewContainer*>(sender());
    SessionController* controller = qobject_cast<SessionController*>(ViewProperties::propertiesById(id));

    if (!controller)
        return;

    // do not move the last tab in a split view.
    if (sourceTabbedContainer) {
        QPointer<ViewContainer> sourceContainer = qobject_cast<ViewContainer*>(sourceTabbedContainer);

        if (_viewSplitter->containers().contains(sourceContainer)) {
            return;
        } else {
            ViewManager* sourceViewManager = sourceTabbedContainer->connectedViewManager();

            // do not remove the last tab on the window
            if (qobject_cast<ViewSplitter*>(sourceViewManager->widget())->containers().size() > 1) {
                return;
            }
        }
    }

    createView(controller->session(), container, index);
    controller->session()->refresh();
    moved = true;
}

void ViewManager::setNavigationMethod(NavigationMethod method)
{
    _navigationMethod = method;

    KActionCollection* collection = _actionCollection;

    if (collection) {
        // FIXME: The following disables certain actions for the KPart that it
        // doesn't actually have a use for, to avoid polluting the action/shortcut
        // namespace of an application using the KPart (otherwise, a shortcut may
        // be in use twice, and the user gets to see an "ambiguous shortcut over-
        // load" error dialog). However, this approach sucks - it's the inverse of
        // what it should be. Rather than disabling actions not used by the KPart,
        // a method should be devised to only enable those that are used, perhaps
        // by using a separate action collection.

        const bool enable = (_navigationMethod != NoNavigation);
        QAction* action;

        action = collection->action("next-view");
        if (action) action->setEnabled(enable);

        action = collection->action("previous-view");
        if (action) action->setEnabled(enable);

        action = collection->action("last-tab");
        if (action) action->setEnabled(enable);

        action = collection->action("split-view-left-right");
        if (action) action->setEnabled(enable);

        action = collection->action("split-view-top-bottom");
        if (action) action->setEnabled(enable);

        action = collection->action("rename-session");
        if (action) action->setEnabled(enable);