latte-dock/app/layout.cpp

/*
*  Copyright 2017  Smith AR <audoban@openmailbox.org>
*                  Michail Vourlakos <mvourlakos@gmail.com>
*
*  This file is part of Latte-Dock
*
*  Latte-Dock 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.
*
*  Latte-Dock 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, see <http://www.gnu.org/licenses/>.
*/

#include "layout.h"

#include "screenpool.h"

#include <QDir>
#include <QFile>
#include <KSharedConfig>

namespace Latte {

Layout::Layout(QObject *parent, QString layoutFile, QString assignedName)
    : QObject(parent)
{
    qDebug() << "Layout file to create object: " << layoutFile << " with name: " << assignedName;

    if (QFile(layoutFile).exists()) {
        if (assignedName.isEmpty()) {
            assignedName =  layoutName(layoutFile);
        }

        KSharedConfigPtr lConfig = KSharedConfig::openConfig(layoutFile);
        m_layoutGroup = KConfigGroup(lConfig, "LayoutSettings");

        setFile(layoutFile);
        setName(assignedName);
        loadConfig();
        init();
    }
}

Layout::~Layout()
{
    if (!m_layoutFile.isEmpty()) {
        //saveConfig();
        m_layoutGroup.sync();
    }
}

void Layout::unloadContainments()
{
    if (!m_corona) {
        return;
    }

    qDebug() << "Layout - " + name() + " unload: containments ... size: " << m_containments.size();

    while (!m_containments.isEmpty()) {
        Plasma::Containment *containment = m_containments.at(0);
        m_containments.removeFirst();
        delete containment;
    }
}

void Layout::unloadDockViews()
{
    if (!m_corona) {
        return;
    }

    qDebug() << "Layout - " + name() + " unload: dockViews ... size: " << m_dockViews.size();

    qDeleteAll(m_dockViews);
    qDeleteAll(m_waitingDockViews);
    m_dockViews.clear();
    m_waitingDockViews.clear();
}

void Layout::init()
{
    connect(this, &Layout::activitiesChanged, this, &Layout::saveConfig);
    connect(this, &Layout::versionChanged, this, &Layout::saveConfig);
    connect(this, &Layout::colorChanged, this, &Layout::saveConfig);
    connect(this, &Layout::showInMenuChanged, this, &Layout::saveConfig);
    connect(this, &Layout::launchersChanged, this, &Layout::saveConfig);
}

void Layout::initToCorona(DockCorona *corona)
{
    m_corona = corona;

    foreach (auto containment, m_corona->containments()) {
        // QString layout = containment->config().readEntry("layout", QString());
        addContainment(containment);
    }

    qDebug() << "Layout ::::: " << name() << " added contaiments ::: " << m_containments.size();

    connect(m_corona, &Plasma::Corona::containmentAdded, this, &Layout::addContainment);
}

int Layout::version() const
{
    return m_version;
}

void Layout::setVersion(int ver)
{
    if (m_version == ver) {
        return;
    }

    m_version = ver;

    emit versionChanged();
}

bool Layout::showInMenu() const
{
    return m_showInMenu;
}

void Layout::setShowInMenu(bool show)
{
    if (m_showInMenu == show) {
        return;
    }

    m_showInMenu = show;
    emit showInMenuChanged();
}

QString Layout::name() const
{
    return m_layoutName;
}

void Layout::setName(QString name)
{
    if (m_layoutName == name) {
        return;
    }

    qDebug() << "Layout name:" << name;

    m_layoutName = name;

    emit nameChanged();
}

QString Layout::color() const
{
    return m_color;
}

void Layout::setColor(QString color)
{
    if (m_color == color) {
        return;
    }

    m_color = color;
    emit colorChanged();
}


QString Layout::file() const
{
    return m_layoutFile;
}

void Layout::setFile(QString file)
{
    if (m_layoutFile == file) {
        return;
    }

    qDebug() << "Layout file:" << file;

    m_layoutFile = file;
    emit fileChanged();
}

QStringList Layout::launchers() const
{
    return m_launchers;
}

void Layout::setLaunchers(QStringList launcherList)
{
    if (m_launchers == launcherList)
        return;

    m_launchers = launcherList;

    emit launchersChanged();
}

QStringList Layout::activities() const
{
    return m_activities;
}

void Layout::setActivities(QStringList activities)
{
    if (m_activities == activities) {
        return;
    }

    m_activities = activities;

    emit activitiesChanged();
}

bool Layout::fileIsBroken() const
{
    if (m_layoutFile.isEmpty() || !QFile(m_layoutFile).exists()) {
        return false;
    }

    KSharedConfigPtr lFile = KSharedConfig::openConfig(m_layoutFile);
    KConfigGroup containmentsEntries = KConfigGroup(lFile, "Containments");

    QStringList ids;

    ids << containmentsEntries.groupList();
    QStringList conts;
    conts << ids;
    QStringList applets;

    foreach (auto cId, containmentsEntries.groupList()) {
        auto appletsEntries = containmentsEntries.group(cId).group("Applets");

        ids << appletsEntries.groupList();
        applets << appletsEntries.groupList();
    }

    QSet<QString> idsSet = QSet<QString>::fromList(ids);

    QMap<QString, int> countOfStrings;

    for (int i = 0; i < ids.count(); i++) {
        countOfStrings[ids[i]]++;
    }

    if (idsSet.count() != ids.count()) {
        qDebug() << "   ----   ERROR: BROKEN LAYOUT ----";

        foreach (QString c, conts) {
            if (applets.contains(c)) {
                qDebug() << "Error: Same applet and containment id found ::: " << c;
            }
        }

        for (int i = 0; i < ids.count(); ++i) {
            for (int j = i + 1; j < ids.count(); ++j) {
                if (ids[i] == ids[j]) {
                    qDebug() << "Error: Applets with same id ::: " << ids[i];
                }
            }
        }

        return true;
    }

    return false;
}


QString Layout::layoutName(const QString &fileName)
{
    int lastSlash = fileName.lastIndexOf("/");
    QString tempLayoutFile = fileName;
    QString layoutName = tempLayoutFile.remove(0, lastSlash + 1);

    int ext = layoutName.lastIndexOf(".layout.latte");
    layoutName = layoutName.remove(ext, 13);

    return layoutName;
}

void Layout::loadConfig()
{
    m_version = m_layoutGroup.readEntry("version", 2);
    m_color = m_layoutGroup.readEntry("color", QString("blue"));
    m_showInMenu = m_layoutGroup.readEntry("showInMenu", false);
    m_activities = m_layoutGroup.readEntry("activities", QStringList());
    m_launchers = m_layoutGroup.readEntry("launchers", QStringList());
}

void Layout::saveConfig()
{
    qDebug() << "layout is saving... for layout:" << m_layoutName;
    m_layoutGroup.writeEntry("version", m_version);
    m_layoutGroup.writeEntry("showInMenu", m_showInMenu);
    m_layoutGroup.writeEntry("color", m_color);
    m_layoutGroup.writeEntry("launchers", m_launchers);
    m_layoutGroup.writeEntry("activities", m_activities);

    m_layoutGroup.sync();
}

//! Containments Actions

void Layout::addContainment(Plasma::Containment *containment)
{
    if (m_containments.contains(containment)) {
        return;
    }

    m_containments.append(containment);
    connect(containment, &QObject::destroyed, this, &Layout::containmentDestroyed);
}

QHash<const Plasma::Containment *, DockView *> *Layout::dockViews()
{
    return &m_dockViews;
}

void Layout::destroyedChanged(bool destroyed)
{
    if (!m_corona) {
        return;
    }

    qDebug() << "dock containment destroyed changed!!!!";
    Plasma::Containment *sender = qobject_cast<Plasma::Containment *>(QObject::sender());

    if (!sender) {
        return;
    }

    if (destroyed) {
        m_waitingDockViews[sender] = m_dockViews.take(static_cast<Plasma::Containment *>(sender));
    } else {
        m_dockViews[sender] = m_waitingDockViews.take(static_cast<Plasma::Containment *>(sender));
    }

    emit m_corona->docksCountChanged();
    emit m_corona->availableScreenRectChanged();
    emit m_corona->availableScreenRegionChanged();
}

void Layout::containmentDestroyed(QObject *cont)
{
    if (!m_corona) {
        return;
    }

    Plasma::Containment *containment = static_cast<Plasma::Containment *>(cont);

    if (containment) {
        int containmentIndex = m_containments.indexOf(containment);

        if (containmentIndex >= 0) {
            m_containments.removeAt(containmentIndex);
        }

        qDebug() << "Layout " << name() << " :: containment destroyed!!!!";
        auto view = m_dockViews.take(containment);

        if (!view) {
            view = m_waitingDockViews.take(containment);
        }

        if (view) {
            view->deleteLater();

            emit m_corona->docksCountChanged();
            emit m_corona->availableScreenRectChanged();
            emit m_corona->availableScreenRegionChanged();
        }
    }
}

void Layout::addDock(Plasma::Containment *containment, bool forceLoading, int expDockScreen)
{
    if (!containment || !m_corona || !containment->kPackage().isValid()) {
        qWarning() << "the requested containment plugin can not be located or loaded";
        return;
    }

    auto metadata = containment->kPackage().metadata();

    if (metadata.pluginId() != "org.kde.latte.containment")
        return;

    for (auto *dock : m_dockViews) {
        if (dock->containment() == containment)
            return;
    }

    QScreen *nextScreen{qGuiApp->primaryScreen()};

    bool onPrimary = containment->config().readEntry("onPrimary", true);
    int id = containment->screen();

    if (id == -1 && expDockScreen == -1) {
        id = containment->lastScreen();
    }

    if (expDockScreen > -1) {
        id = expDockScreen;
    }

    qDebug() << "add dock - containment id: " << containment->id() << " ,screen id : " << id << " ,onprimary:" << onPrimary << " ,forceDockLoad:" << forceLoading;

    if (id >= 0 && !onPrimary && !forceLoading) {
        QString connector = m_corona->screenPool()->connector(id);
        qDebug() << "add dock - connector : " << connector;
        bool found{false};

        foreach (auto scr, qGuiApp->screens()) {
            if (scr && scr->name() == connector) {
                found = true;
                nextScreen = scr;
                break;
            }
        }

        if (!found) {
            qDebug() << "adding dock rejected, screen not available : " << connector;
            return;
        }
    } else if (onPrimary) {
        if (m_corona->explicitDockOccupyEdge(m_corona->screenPool()->primaryScreenId(), containment->location())) {
            //we must check that an onPrimary dock should never catch up the same edge on
            //the same screen with an explicit dock
            return;
        }
    }

    qDebug() << "Adding dock for container...";
    qDebug() << "onPrimary: " << onPrimary << "screen!!! :" << nextScreen->name();

    //! it is used to set the correct flag during the creation
    //! of the window... This of course is also used during
    //! recreations of the window between different visibility modes
    auto mode = static_cast<Dock::Visibility>(containment->config().readEntry("visibility", static_cast<int>(Dock::DodgeActive)));
    bool dockWin{true};

    if (mode == Dock::AlwaysVisible || mode == Dock::WindowsGoBelow) {
        dockWin = true;
    } else {
        dockWin = containment->config().readEntry("dockWindowBehavior", true);
    }

    auto dockView = new DockView(m_corona, nextScreen, dockWin);
    dockView->init();
    dockView->setContainment(containment);
    dockView->setManagedLayout(this);

    //! force this special dock case to become primary
    //! even though it isnt
    if (forceLoading) {
        dockView->setOnPrimary(true);
    }

    //  connect(containment, &QObject::destroyed, this, &Layout::containmentDestroyed);
    connect(containment, &Plasma::Applet::destroyedChanged, this, &Layout::destroyedChanged);
    connect(containment, &Plasma::Applet::locationChanged, m_corona, &DockCorona::dockLocationChanged);
    connect(containment, &Plasma::Containment::appletAlternativesRequested
            , m_corona, &DockCorona::showAlternativesForApplet, Qt::QueuedConnection);

    //! Qt 5.9 creates a crash for this in wayland, that is why the check is used
    //! but on the other hand we need this for copy to work correctly and show
    //! the copied dock under X11
    //if (!KWindowSystem::isPlatformWayland()) {
    dockView->show();
    //}

    m_dockViews[containment] = dockView;

    emit m_corona->docksCountChanged();
}

void Layout::copyDock(Plasma::Containment *containment)
{
    if (!containment || !m_corona)
        return;

    qDebug() << "copying containment layout";
    //! Settting mutable for create a containment
    m_corona->setImmutability(Plasma::Types::Mutable);

    QStringList toCopyContainmentIds;
    QStringList toCopyAppletIds;

    QString temp1File = QDir::homePath() + "/.config/lattedock.copy1.bak";
    QString temp2File = QDir::homePath() + "/.config/lattedock.copy2.bak";

    //! WE NEED A WAY TO COPY A CONTAINMENT!!!!
    QFile copyFile(temp1File);
    QFile copyFile2(temp2File);

    if (copyFile.exists())
        copyFile.remove();

    if (copyFile2.exists())
        copyFile2.remove();

    KSharedConfigPtr newFile = KSharedConfig::openConfig(QDir::homePath() + "/.config/lattedock.copy1.bak");
    KConfigGroup copied_conts = KConfigGroup(newFile, "Containments");
    KConfigGroup copied_c1 = KConfigGroup(&copied_conts, QString::number(containment->id()));
    KConfigGroup copied_systray;

    toCopyContainmentIds << QString::number(containment->id());
    toCopyAppletIds << containment->config().group("Applets").groupList();
    containment->config().copyTo(&copied_c1);

    //!investigate if there is a systray in the containment to copy also
    int systrayId = -1;
    QString systrayAppletId;
    auto applets = containment->config().group("Applets");

    foreach (auto applet, applets.groupList()) {
        KConfigGroup appletSettings = applets.group(applet).group("Configuration");

        int tSysId = appletSettings.readEntry("SystrayContainmentId", "-1").toInt();

        if (tSysId != -1) {
            systrayId = tSysId;
            systrayAppletId = applet;
            qDebug() << "systray was found in the containment...";
            break;
        }
    }

    if (systrayId != -1) {
        Plasma::Containment *systray{nullptr};

        foreach (auto containment, m_corona->containments()) {
            if (containment->id() == systrayId) {
                systray = containment;
                break;
            }
        }

        if (systray) {
            copied_systray = KConfigGroup(&copied_conts, QString::number(systray->id()));
            toCopyContainmentIds << QString::number(systray->id());
            toCopyAppletIds << systray->config().group("Applets").groupList();
            systray->config().copyTo(&copied_systray);
        }
    }

    //! end of systray specific code

    //! BEGIN updating the ids in the temp file
    QStringList allIds;
    allIds << m_corona->containmentsIds();
    allIds << m_corona->appletsIds();

    //qDebug() << "Ids:" << allIds;

    //qDebug() << "to copy containments: " << toCopyContainmentIds;
    //qDebug() << "to copy applets: " << toCopyAppletIds;

    QStringList assignedIds;
    QHash<QString, QString> assigned;

    foreach (auto contId, toCopyContainmentIds) {
        QString newId = availableId(allIds, assignedIds, 12);
        assignedIds << newId;
        assigned[contId] = newId;
    }

    foreach (auto appId, toCopyAppletIds) {
        QString newId = availableId(allIds, assignedIds, 40);
        assignedIds << newId;
        assigned[appId] = newId;
    }

    qDebug() << "full assignments ::: " << assigned;

    QString order1 = copied_c1.group("General").readEntry("appletOrder", QString());
    QStringList order1Ids = order1.split(";");
    QStringList fixedOrder1Ids;

    //qDebug() << "order1 :: " << order1;

    for (int i = 0; i < order1Ids.count(); ++i) {
        fixedOrder1Ids.append(assigned[order1Ids[i]]);
    }

    QString fixedOrder1 = fixedOrder1Ids.join(";");
    //qDebug() << "fixed order ::: " << fixedOrder1;
    copied_c1.group("General").writeEntry("appletOrder", fixedOrder1);

    //! must update also the systray id in its applet
    if (systrayId > -1) {
        copied_c1.group("Applets").group(systrayAppletId).group("Configuration").writeEntry("SystrayContainmentId", assigned[QString::number(systrayId)]);
        copied_systray.sync();
    }

    copied_c1.sync();

    QFile(temp1File).copy(temp2File);

    QFile f(temp2File);

    if (!f.open(QFile::ReadOnly)) {
        qDebug() << "temp file couldnt be opened...";
        return;
    }

    QTextStream in(&f);
    QString fileText = in.readAll();

    foreach (auto contId, toCopyContainmentIds) {
        fileText = fileText.replace("[Containments][" + contId + "]", "[Containments][" + assigned[contId] + "]");
    }

    foreach (auto appId, toCopyAppletIds) {
        fileText = fileText.replace("][Applets][" + appId + "]", "][Applets][" + assigned[appId] + "]");
    }

    f.close();

    if (!f.open(QFile::WriteOnly)) {
        qDebug() << "temp file couldnt be opened for writing...";
        return;
    }

    QTextStream outputStream(&f);
    outputStream << fileText;
    f.close();
    //! END of updating the ids in the temp file

    //! Finally import the configuration
    KSharedConfigPtr newFile2 = KSharedConfig::openConfig(QDir::homePath() + "/.config/lattedock.copy2.bak");
    auto nConts = m_corona->importLayout(KConfigGroup(newFile2, ""));

    ///Find latte and systray containments
    qDebug() << " imported containments ::: " << nConts.length();

    Plasma::Containment *newContainment{nullptr};
    int newSystrayId = -1;

    foreach (auto containment, nConts) {
        KPluginMetaData meta = containment->kPackage().metadata();

        if (meta.pluginId() == "org.kde.latte.containment") {
            qDebug() << "new latte containment id: " << containment->id();
            newContainment = containment;
        } else if (meta.pluginId() == "org.kde.plasma.private.systemtray") {
            qDebug() << "new systray containment id: " << containment->id();
            newSystrayId = containment->id();
        }
    }

    if (!newContainment)
        return;

    ///after systray was found we must update in latte the relevant id
    if (newSystrayId != -1) {
        applets = newContainment->config().group("Applets");

        qDebug() << "systray found with id : " << newSystrayId << " and applets in the containment :" << applets.groupList().count();

        foreach (auto applet, applets.groupList()) {
            KConfigGroup appletSettings = applets.group(applet).group("Configuration");

            if (appletSettings.hasKey("SystrayContainmentId")) {
                qDebug() << "!!! updating systray id to : " << newSystrayId;
                appletSettings.writeEntry("SystrayContainmentId", newSystrayId);
            }
        }
    }

    if (!newContainment || !newContainment->kPackage().isValid()) {
        qWarning() << "the requested containment plugin can not be located or loaded";
        return;
    }

    auto config = newContainment->config();

    //in multi-screen environment the copied dock is moved to alternative screens first
    const auto screens = qGuiApp->screens();
    auto dock = m_dockViews[containment];

    bool setOnExplicitScreen = false;

    int dockScrId = -1;
    int copyScrId = -1;

    if (dock) {
        dockScrId = m_corona->screenPool()->id(dock->currentScreen());
        qDebug() << "COPY DOCK SCREEN ::: " << dockScrId;

        if (dockScrId != -1 && screens.count() > 1) {
            foreach (auto scr, screens) {
                copyScrId = m_corona->screenPool()->id(scr->name());

                //the screen must exist and not be the same with the original dock
                if (copyScrId > -1 && copyScrId != dockScrId) {
                    QList<Plasma::Types::Location> fEdges = m_corona->freeEdges(copyScrId);

                    if (fEdges.contains((Plasma::Types::Location)containment->location())) {
                        ///set this containment to an explicit screen
                        config.writeEntry("onPrimary", false);
                        config.writeEntry("lastScreen", copyScrId);
                        newContainment->setLocation(containment->location());

                        qDebug() << "COPY DOCK SCREEN NEW SCREEN ::: " << copyScrId;

                        setOnExplicitScreen = true;
                        break;
                    }
                }
            }
        }
    }

    if (!setOnExplicitScreen) {
        QList<Plasma::Types::Location> edges = m_corona->freeEdges(newContainment->screen());

        if (edges.count() > 0) {
            newContainment->setLocation(edges.at(0));
        } else {
            newContainment->setLocation(Plasma::Types::BottomEdge);
        }

        config.writeEntry("onPrimary", false);
        config.writeEntry("lastScreen", dockScrId);
    }

    newContainment->config().sync();

    if (setOnExplicitScreen && copyScrId > -1) {
        qDebug() << "Copy Dock in explicit screen ::: " << copyScrId;
        addDock(newContainment, copyScrId);
        newContainment->reactToScreenChange();
    } else {
        qDebug() << "Copy Dock in current screen...";
        addDock(newContainment, dockScrId);
    }
}

QString Layout::availableId(QStringList all, QStringList assigned, int base)
{
    bool found = false;

    int i = base;

    while (!found && i < 30000) {
        QString iStr = QString::number(i);

        if (!all.contains(iStr) && !assigned.contains(iStr)) {
            return iStr;
        }

        i++;
    }

    return QString("");
}

void Layout::recreateDock(Plasma::Containment *containment)
{
    if (!m_corona) {
        return;
    }

    //! give the time to config window to close itself first and then recreate the dock
    //! step:1 remove the dockview
    QTimer::singleShot(350, [this, containment]() {
        auto view = m_dockViews.take(containment);

        if (view) {
            qDebug() << "recreate - step 1: removing dock for containment:" << containment->id();

            //! step:2 add the new dockview
            connect(view, &QObject::destroyed, this, [this, containment]() {
                QTimer::singleShot(250, this, [this, containment]() {
                    if (!m_dockViews.contains(containment)) {
                        qDebug() << "recreate - step 2: adding dock for containment:" << containment->id();
                        addDock(containment);
                    }
                });
            });

            view->deleteLater();

        }
    });
}

//! the central functions that updates loading/unloading dockviews
//! concerning screen changed (for multi-screen setups mainly)
void Layout::syncDockViewsToScreens()
{
    if (!m_corona) {
        return;
    }

    qDebug() << "screen count changed -+-+ " << qGuiApp->screens().size();

    qDebug() << "adding consideration....";
    qDebug() << "dock view running : " << m_dockViews.count();

    foreach (auto scr, qGuiApp->screens()) {
        qDebug() << "Found screen: " << scr->name();

        foreach (auto cont, m_corona->containments()) {
            int id = cont->screen();

            if (id == -1) {
                id = cont->lastScreen();
            }

            bool onPrimary = cont->config().readEntry("onPrimary", true);
            Plasma::Types::Location location = static_cast<Plasma::Types::Location>((int)cont->config().readEntry("location", (int)Plasma::Types::BottomEdge));

            //! two main situations that a dock must be added when it is not already running
            //! 1. when a dock is primary, not running and the edge for which is associated is free
            //! 2. when a dock in explicit, not running and the associated screen currently exists
            //! e.g. the screen has just been added
            if (((onPrimary && m_corona->freeEdges(qGuiApp->primaryScreen()).contains(location)) || (!onPrimary && (m_corona->screenPool()->connector(id) == scr->name())))
                && (!m_dockViews.contains(cont))) {
                qDebug() << "screen Count signal: view must be added... for:" << scr->name();
                addDock(cont);
            }
        }
    }

    qDebug() << "removing consideration & updating screen for always on primary docks....";

    //! this code tries to find a containment that must not be deleted by
    //! automatic algorithm. Currently the containment with the minimum id
    //! containing tasks plasmoid wins
    int preserveContainmentId{ -1};
    bool dockWithTasksWillBeShown{false};

    //! associate correct values for preserveContainmentId and
    //! dockWithTasksWillBeShown
    foreach (auto view, m_dockViews) {
        bool found{false};

        foreach (auto scr, qGuiApp->screens()) {
            if (scr->name() == view->currentScreen()
                || (view->onPrimary() && scr == qGuiApp->primaryScreen())) {
                found = true;
                break;
            }
        }

        //!check if a tasks dock will be shown (try to prevent its deletion)
        if (found && view->tasksPresent()) {
            dockWithTasksWillBeShown = true;
        }

        if (!found && !view->onPrimary() && (m_dockViews.size() > 1) && m_dockViews.contains(view->containment())
            && !(view->tasksPresent() && m_corona->noDocksWithTasks() == 1)) { //do not delete last dock containing tasks
            if (view->tasksPresent()) {
                if (preserveContainmentId == -1)
                    preserveContainmentId = view->containment()->id();
                else if (view->containment()->id() < preserveContainmentId)
                    preserveContainmentId = view->containment()->id();
            }
        }
    }

    //! check which docks must be deleted e.g. when the corresponding
    //! screen does not exist any more.
    //! The code is smart enough in order
    //! to never delete the last tasks dock and also it makes sure that
    //! the last tasks dock which will exist in the end will be the one
    //! with the lowest containment id
    foreach (auto view, m_dockViews) {
        bool found{false};

        foreach (auto scr, qGuiApp->screens()) {
            if (scr->name() == view->currentScreen()
                || (view->onPrimary() && scr == qGuiApp->primaryScreen())) {
                found = true;
                break;
            }
        }


        //! which explicit docks can be deleted
        if (!found && !view->onPrimary() && (m_dockViews.size() > 1) && m_dockViews.contains(view->containment())
            && !(view->tasksPresent() && m_corona->noDocksWithTasks() == 1)) {
            //do not delete last dock containing tasks
            if (dockWithTasksWillBeShown || preserveContainmentId != view->containment()->id()) {
                qDebug() << "screen Count signal: view must be deleted... for:" << view->currentScreen();
                auto viewToDelete = m_dockViews.take(view->containment());
                viewToDelete->deleteLater();
            }

            //!which primary docks can be deleted
        } else if (view->onPrimary() && !found
                   && !m_corona->freeEdges(qGuiApp->primaryScreen()).contains(view->location())) {
            qDebug() << "screen Count signal: primary view must be deleted... for:" << view->currentScreen();
            auto viewToDelete = m_dockViews.take(view->containment());
            viewToDelete->deleteLater();
        } else {
            //! if the dock will not be deleted its a very good point to reconsider
            //! if the screen in which is running is the correct one
            view->reconsiderScreen();
        }
    }

    qDebug() << "end of screens count change....";
}

}