/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>

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, see <http://www.gnu.org/licenses/>.
*********************************************************************/

//#define QT_CLEAN_NAMESPACE

#include "workspace.h"

#include <kapplication.h>
#include <kstartupinfo.h>
#include <fixx11h.h>
#include <kconfig.h>
#include <kglobal.h>
#include <klocale.h>
#include <QRegExp>
#include <QPainter>
#include <QBitmap>
#include <QClipboard>
#include <kmenubar.h>
#include <kprocess.h>
#include <kglobalaccel.h>
#include <QToolButton>
#include <kactioncollection.h>
#include <kaction.h>
#include <kconfiggroup.h>
#include <kcmdlineargs.h>
#include <QtDBus/QtDBus>

#include "client.h"
#ifdef KWIN_BUILD_TABBOX
#include "tabbox.h"
#endif
#ifdef KWIN_BUILD_DESKTOPCHANGEOSD
#include "desktopchangeosd.h"
#endif
#include "atoms.h"
#include "placement.h"
#include "notifications.h"
#include "outline.h"
#include "group.h"
#include "rules.h"
#include "kwinadaptor.h"
#include "unmanaged.h"
#include "deleted.h"
#include "effects.h"
#include "overlaywindow.h"
#ifdef KWIN_BUILD_TILING
#include "tiling/tile.h"
#include "tiling/tilinglayout.h"
#include "tiling/tiling.h"
#endif

#include <X11/extensions/shape.h>
#include <X11/keysym.h>
#include <X11/keysymdef.h>
#include <X11/cursorfont.h>
#include <QX11Info>
#include <stdio.h>
#include <kauthorized.h>
#include <ktoolinvocation.h>
#include <kglobalsettings.h>
#include <kwindowsystem.h>
#include <kwindowinfo.h>

#include <kephal/screens.h>

namespace KWin
{

extern int screen_number;
static const int KWIN_MAX_NUMBER_DESKTOPS = 20;

Workspace* Workspace::_self = 0;

//-----------------------------------------------------------------------------
// Rikkus: This class is too complex. It needs splitting further.
// It's a nightmare to understand, especially with so few comments :(
//
// Matthias: Feel free to ask me questions about it. Feel free to add
// comments. I dissagree that further splittings makes it easier. 2500
// lines are not too much. It's the task that is complex, not the
// code.
//-----------------------------------------------------------------------------

Workspace::Workspace(bool restore)
    : QObject(0)
    // Desktop layout
    , desktopCount_(0)   // This is an invalid state
    , desktopGridSize_(1, 2)   // Default to two rows
    , desktopGrid_(new int[2])
    , currentDesktop_(0)
    // Unsorted
    , active_popup(NULL)
    , active_popup_client(NULL)
    , temporaryRulesMessages("_KDE_NET_WM_TEMPORARY_RULES", NULL, false)
    , rules_updates_disabled(false)
    , active_client(0)
    , last_active_client(0)
    , most_recently_raised(0)
    , movingClient(0)
    , pending_take_activity(NULL)
    , active_screen(0)
    , delayfocus_client(0)
    , force_restacking(false)
    , x_stacking_dirty(true)
    , showing_desktop(false)
    , block_showing_desktop(0)
    , was_user_interaction(false)
    , session_saving(false)
    , block_focus(0)
#ifdef KWIN_BUILD_TABBOX
    , tab_box(0)
#endif
#ifdef KWIN_BUILD_DESKTOPCHANGEOSD
    , desktop_change_osd(0)
#endif
    , popup(0)
    , advanced_popup(0)
    , desk_popup(0)
    , activity_popup(0)
    , add_tabs_popup(0)
    , switch_to_tab_popup(0)
    , keys(0)
    , client_keys(NULL)
    , disable_shortcuts_keys(NULL)
    , client_keys_dialog(NULL)
    , client_keys_client(NULL)
    , global_shortcuts_disabled(false)
    , global_shortcuts_disabled_for_client(false)
    , workspaceInit(true)
    , startup(0)
    , set_active_client_recursion(0)
    , block_stacking_updates(0)
    , forced_global_mouse_grab(false)
    , cm_selection(NULL)
    , compositingSuspended(false)
    , compositingBlocked(false)
    , xrrRefreshRate(0)
    , transSlider(NULL)
    , transButton(NULL)
    , forceUnredirectCheck(true)
    , m_finishingCompositing(false)
{
    (void) new KWinAdaptor(this);

    QDBusConnection dbus = QDBusConnection::sessionBus();
    dbus.registerObject("/KWin", this);
    dbus.connect(QString(), "/KWin", "org.kde.KWin", "reloadConfig",
                 this, SLOT(slotReloadConfig()));
    dbus.connect(QString(), "/KWin", "org.kde.KWin", "reinitCompositing",
                 this, SLOT(slotReinitCompositing()));

    // Initialize desktop grid array
    desktopGrid_[0] = 0;
    desktopGrid_[1] = 0;

    _self = this;
    mgr = new PluginMgr;
    QX11Info info;
    default_colormap = DefaultColormap(display(), info.screen());
    installed_colormap = default_colormap;

    connect(&temporaryRulesMessages, SIGNAL(gotMessage(QString)),
            this, SLOT(gotTemporaryRulesMessage(QString)));
    connect(&rulesUpdatedTimer, SIGNAL(timeout()), this, SLOT(writeWindowRules()));
    connect(&unredirectTimer, SIGNAL(timeout()), this, SLOT(delayedCheckUnredirect()));
    connect(&compositeResetTimer, SIGNAL(timeout()), this, SLOT(resetCompositing()));
    unredirectTimer.setSingleShot(true);
    compositeResetTimer.setSingleShot(true);

    updateXTime(); // Needed for proper initialization of user_time in Client ctor

    delayFocusTimer = 0;

#ifdef KWIN_BUILD_TILING
    m_tiling = new Tiling(this);
#endif

    if (restore)
        loadSessionInfo();

    loadWindowRules();

    // Call this before XSelectInput() on the root window
    startup = new KStartupInfo(
        KStartupInfo::DisableKWinModule | KStartupInfo::AnnounceSilenceChanges, this);

    // Select windowmanager privileges
    XSelectInput(display(), rootWindow(),
                 KeyPressMask |
                 PropertyChangeMask |
                 ColormapChangeMask |
                 SubstructureRedirectMask |
                 SubstructureNotifyMask |
                 FocusChangeMask | // For NotifyDetailNone
                 ExposureMask
                );

    Extensions::init();
    compositingSuspended = !options->isUseCompositing();
#ifdef KWIN_BUILD_TABBOX
    // need to create the tabbox before compositing scene is setup
    tab_box = new TabBox::TabBox(this);
#endif

    nextPaintReference.invalidate(); // Initialize the timer
    setupCompositing();

    // Compatibility
    long data = 1;

    XChangeProperty(
        display(),
        rootWindow(),
        atoms->kwin_running,
        atoms->kwin_running,
        32,
        PropModeAppend,
        (unsigned char*)(&data),
        1
    );

    client_keys = new KActionCollection(this);

#ifdef KWIN_BUILD_DESKTOPCHANGEOSD
    desktop_change_osd = new DesktopChangeOSD(this);
#endif
    m_outline = new Outline();

    initShortcuts();

    init();

    connect(Kephal::Screens::self(), SIGNAL(screenAdded(Kephal::Screen*)), &screenChangedTimer, SLOT(start()));
    connect(Kephal::Screens::self(), SIGNAL(screenRemoved(int)), &screenChangedTimer, SLOT(start()));
    connect(Kephal::Screens::self(), SIGNAL(screenResized(Kephal::Screen*,QSize,QSize)), &screenChangedTimer, SLOT(start()));
    connect(Kephal::Screens::self(), SIGNAL(screenMoved(Kephal::Screen*,QPoint,QPoint)), &screenChangedTimer, SLOT(start()));

    connect(&activityController_, SIGNAL(currentActivityChanged(QString)), SLOT(updateCurrentActivity(QString)));
    connect(&activityController_, SIGNAL(activityRemoved(QString)), SLOT(activityRemoved(QString)));
    connect(&activityController_, SIGNAL(activityAdded(QString)), SLOT(activityAdded(QString)));

    connect(&screenChangedTimer, SIGNAL(timeout()), SLOT(screenChangeTimeout()));
    screenChangedTimer.setSingleShot(true);
    screenChangedTimer.setInterval(100);
}

void Workspace::screenChangeTimeout()
{
    kDebug() << "It is time to call desktopResized";
    desktopResized();
}

void Workspace::init()
{
#ifdef KWIN_BUILD_SCREENEDGES
    m_screenEdge.init();
#endif

    // Not used yet
    //topDock = 0L;
    //maximizedWindowCounter = 0;

    supportWindow = new QWidget(NULL, Qt::X11BypassWindowManagerHint);
    XLowerWindow(display(), supportWindow->winId());   // See usage in layers.cpp

    XSetWindowAttributes attr;
    attr.override_redirect = 1;
    null_focus_window = XCreateWindow(display(), rootWindow(), -1, -1, 1, 1, 0, CopyFromParent,
                                      InputOnly, CopyFromParent, CWOverrideRedirect, &attr);
    XMapWindow(display(), null_focus_window);

    unsigned long protocols[5] = {
        NET::Supported |
        NET::SupportingWMCheck |
        NET::ClientList |
        NET::ClientListStacking |
        NET::DesktopGeometry |
        NET::NumberOfDesktops |
        NET::CurrentDesktop |
        NET::ActiveWindow |
        NET::WorkArea |
        NET::CloseWindow |
        NET::DesktopNames |
        NET::WMName |
        NET::WMVisibleName |
        NET::WMDesktop |
        NET::WMWindowType |
        NET::WMState |
        NET::WMStrut |
        NET::WMIconGeometry |
        NET::WMIcon |
        NET::WMPid |
        NET::WMMoveResize |
        NET::WMFrameExtents |
        NET::WMPing
        ,
        NET::NormalMask |
        NET::DesktopMask |
        NET::DockMask |
        NET::ToolbarMask |
        NET::MenuMask |
        NET::DialogMask |
        NET::OverrideMask |
        NET::UtilityMask |
        NET::SplashMask |
        // No compositing window types here unless we support them also as managed window types
        0
        ,
        NET::Modal |
        //NET::Sticky | // Large desktops not supported (and probably never will be)
        NET::MaxVert |
        NET::MaxHoriz |
        NET::Shaded |
        NET::SkipTaskbar |
        NET::KeepAbove |
        //NET::StaysOnTop | // The same like KeepAbove
        NET::SkipPager |
        NET::Hidden |
        NET::FullScreen |
        NET::KeepBelow |
        NET::DemandsAttention |
        0
        ,
        NET::WM2UserTime |
        NET::WM2StartupId |
        NET::WM2AllowedActions |
        NET::WM2RestackWindow |
        NET::WM2MoveResizeWindow |
        NET::WM2ExtendedStrut |
        NET::WM2KDETemporaryRules |
        NET::WM2ShowingDesktop |
        NET::WM2DesktopLayout |
        NET::WM2FullPlacement |
        NET::WM2FullscreenMonitors |
        NET::WM2KDEShadow |
        0
        ,
        NET::ActionMove |
        NET::ActionResize |
        NET::ActionMinimize |
        NET::ActionShade |
        //NET::ActionStick | // Sticky state is not supported
        NET::ActionMaxVert |
        NET::ActionMaxHoriz |
        NET::ActionFullScreen |
        NET::ActionChangeDesktop |
        NET::ActionClose |
        0
        ,
    };

    if (hasDecorationPlugin() && mgr->factory()->supports(AbilityExtendIntoClientArea))
        protocols[ NETRootInfo::PROTOCOLS2 ] |= NET::WM2FrameOverlap;

    QX11Info info;
    rootInfo = new RootInfo(this, display(), supportWindow->winId(), "KWin", protocols, 5, info.screen());

    loadDesktopSettings();
    updateDesktopLayout();
    // Extra NETRootInfo instance in Client mode is needed to get the values of the properties
    NETRootInfo client_info(display(), NET::ActiveWindow | NET::CurrentDesktop);
    int initial_desktop;
    if (!kapp->isSessionRestored())
        initial_desktop = client_info.currentDesktop();
    else {
        KConfigGroup group(kapp->sessionConfig(), "Session");
        initial_desktop = group.readEntry("desktop", 1);
    }
    if (!setCurrentDesktop(initial_desktop))
        setCurrentDesktop(1);
    allActivities_ = activityController_.listActivities();
    updateCurrentActivity(activityController_.currentActivity());

    // Now we know how many desktops we'll have, thus we initialize the positioning object
    initPositioning = new Placement(this);

    reconfigureTimer.setSingleShot(true);
    updateToolWindowsTimer.setSingleShot(true);

    connect(&reconfigureTimer, SIGNAL(timeout()), this, SLOT(slotReconfigure()));
    connect(&updateToolWindowsTimer, SIGNAL(timeout()), this, SLOT(slotUpdateToolWindows()));
    connect(&mousePollingTimer, SIGNAL(timeout()), SLOT(performMousePoll()));

    connect(KGlobalSettings::self(), SIGNAL(appearanceChanged()), this, SLOT(reconfigure()));
    connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)), this, SLOT(slotSettingsChanged(int)));
    connect(KGlobalSettings::self(), SIGNAL(blockShortcuts(int)), this, SLOT(slotBlockShortcuts(int)));

    active_client = NULL;
    rootInfo->setActiveWindow(None);
    focusToNull();
    if (!kapp->isSessionRestored())
        ++block_focus; // Because it will be set below

    {
        // Begin updates blocker block
        StackingUpdatesBlocker blocker(this);

        unsigned int i, nwins;
        Window root_return, parent_return;
        Window* wins;
        XQueryTree(display(), rootWindow(), &root_return, &parent_return, &wins, &nwins);
        bool fixoffset = KCmdLineArgs::parsedArgs()->getOption("crashes").toInt() > 0;
        for (i = 0; i < nwins; i++) {
            XWindowAttributes attr;
            XGetWindowAttributes(display(), wins[i], &attr);
            if (attr.override_redirect) {
                createUnmanaged(wins[i]);
                continue;
            }
            if (attr.map_state != IsUnmapped) {
                if (fixoffset)
                    fixPositionAfterCrash(wins[ i ], attr);
                createClient(wins[i], true);
            }
        }
        if (wins)
            XFree((void*)(wins));

        // Propagate clients, will really happen at the end of the updates blocker block
        updateStackingOrder(true);

        saveOldScreenSizes();
        updateClientArea();

        // NETWM spec says we have to set it to (0,0) if we don't support it
        NETPoint* viewports = new NETPoint[numberOfDesktops()];
        rootInfo->setDesktopViewport(numberOfDesktops(), *viewports);
        delete[] viewports;
        QRect geom = Kephal::ScreenUtils::desktopGeometry();
        NETSize desktop_geometry;
        desktop_geometry.width = geom.width();
        desktop_geometry.height = geom.height();
        rootInfo->setDesktopGeometry(-1, desktop_geometry);
        setShowingDesktop(false);

    } // End updates blocker block

    Client* new_active_client = NULL;
    if (!kapp->isSessionRestored()) {
        --block_focus;
        new_active_client = findClient(WindowMatchPredicate(client_info.activeWindow()));
    }
    if (new_active_client == NULL
            && activeClient() == NULL && should_get_focus.count() == 0) {
        // No client activated in manage()
        if (new_active_client == NULL)
            new_active_client = topClientOnDesktop(currentDesktop(), -1);
        if (new_active_client == NULL && !desktops.isEmpty())
            new_active_client = findDesktop(true, currentDesktop());
    }
    if (new_active_client != NULL)
        activateClient(new_active_client);

#ifdef KWIN_BUILD_TILING
    // Enable/disable tiling
    m_tiling->setEnabled(options->isTilingOn());
#endif

    // SELI TODO: This won't work with unreasonable focus policies,
    // and maybe in rare cases also if the selected client doesn't
    // want focus
    workspaceInit = false;

    // TODO: ungrabXServer()
}

Workspace::~Workspace()
{
    finishCompositing();
    blockStackingUpdates(true);
#ifdef KWIN_BUILD_TILING
    delete m_tiling;
#endif

    // TODO: grabXServer();

    // Use stacking_order, so that kwin --replace keeps stacking order
    for (ClientList::iterator it = stacking_order.begin(), end = stacking_order.end(); it != end; ++it) {
        // Only release the window
        (*it)->releaseWindow(true);
        // No removeClient() is called, it does more than just removing.
        // However, remove from some lists to e.g. prevent performTransiencyCheck()
        // from crashing.
        clients.removeAll(*it);
        desktops.removeAll(*it);
    }
    for (UnmanagedList::iterator it = unmanaged.begin(), end = unmanaged.end(); it != end; ++it)
        (*it)->release();
#ifdef KWIN_BUILD_DESKTOPCHANGEOSD
    delete desktop_change_osd;
#endif
    delete m_outline;
    discardPopup();
    XDeleteProperty(display(), rootWindow(), atoms->kwin_running);

    writeWindowRules();
    KGlobal::config()->sync();

    delete rootInfo;
    delete supportWindow;
    delete mgr;
    delete startup;
    delete initPositioning;
    delete client_keys_dialog;
    while (!rules.isEmpty()) {
        delete rules.front();
        rules.pop_front();
    }
    foreach (SessionInfo * s, session)
    delete s;
    XDestroyWindow(display(), null_focus_window);

    // TODO: ungrabXServer();

    delete[] desktopGrid_;

    _self = 0;
}

Client* Workspace::createClient(Window w, bool is_mapped)
{
    StackingUpdatesBlocker blocker(this);
    Client* c = new Client(this);
    if (!c->manage(w, is_mapped)) {
        Client::deleteClient(c, Allowed);
        return NULL;
    }
    addClient(c, Allowed);
#ifdef KWIN_BUILD_TILING
    m_tiling->createTile(c);
#endif
    return c;
}

Unmanaged* Workspace::createUnmanaged(Window w)
{
    if (compositing() && w == scene->overlayWindow()->window())
        return NULL;
    Unmanaged* c = new Unmanaged(this);
    if (!c->track(w)) {
        Unmanaged::deleteUnmanaged(c, Allowed);
        return NULL;
    }
    addUnmanaged(c, Allowed);
    emit unmanagedAdded(c);
    return c;
}

void Workspace::addClient(Client* c, allowed_t)
{
    Group* grp = findGroup(c->window());

    KWindowInfo info = KWindowSystem::windowInfo(c->window(), -1U, NET::WM2WindowClass);

    /*
    if (info.windowClassName() == QString("krunner")) {
    SWrapper::Workspace* ws_object = KWin::Scripting::workspace();
    if (ws_object != 0) {
        ws_object->sl_killWindowCalled(c);
    }
    }*/

    emit clientAdded(c);

    if (grp != NULL)
        grp->gotLeader(c);

    if (c->isDesktop()) {
        desktops.append(c);
        if (active_client == NULL && should_get_focus.isEmpty() && c->isOnCurrentDesktop())
            requestFocus(c);   // TODO: Make sure desktop is active after startup if there's no other window active
    } else {
        updateFocusChains(c, FocusChainUpdate);   // Add to focus chain if not already there
        clients.append(c);
    }
    if (!unconstrained_stacking_order.contains(c))
        unconstrained_stacking_order.append(c);   // Raise if it hasn't got any stacking position yet
    if (!stacking_order.contains(c))    // It'll be updated later, and updateToolWindows() requires
        stacking_order.append(c);      // c to be in stacking_order
    x_stacking_dirty = true;
    updateClientArea(); // This cannot be in manage(), because the client got added only now
    updateClientLayer(c);
    if (c->isDesktop()) {
        raiseClient(c);
        // If there's no active client, make this desktop the active one
        if (activeClient() == NULL && should_get_focus.count() == 0)
            activateClient(findDesktop(true, currentDesktop()));
    }
    c->checkActiveModal();
    checkTransients(c->window());   // SELI TODO: Does this really belong here?
    updateStackingOrder(true);   // Propagate new client
    if (c->isUtility() || c->isMenu() || c->isToolbar())
        updateToolWindows(true);
    checkNonExistentClients();
#ifdef KWIN_BUILD_TABBOX
    if (tabBox()->isDisplayed())
        tab_box->reset(true);
#endif
}

void Workspace::addUnmanaged(Unmanaged* c, allowed_t)
{
    unmanaged.append(c);
    x_stacking_dirty = true;
}

/**
 * Destroys the client \a c
 */
void Workspace::removeClient(Client* c, allowed_t)
{
    emit clientRemoved(c);

    if (c == active_popup_client)
        closeActivePopup();

    c->untab();

    if (client_keys_client == c)
        setupWindowShortcutDone(false);
    if (!c->shortcut().isEmpty()) {
        c->setShortcut(QString());   // Remove from client_keys
        clientShortcutUpdated(c);   // Needed, since this is otherwise delayed by setShortcut() and wouldn't run
    }

    if (c->isDialog())
        Notify::raise(Notify::TransDelete);
    if (c->isNormalWindow())
        Notify::raise(Notify::Delete);

#ifdef KWIN_BUILD_TABBOX
    if (tabBox()->isDisplayed() && tabBox()->currentClient() == c)
        tab_box->nextPrev(true);
#endif

    Q_ASSERT(clients.contains(c) || desktops.contains(c));
    // TODO: if marked client is removed, notify the marked list
    clients.removeAll(c);
    desktops.removeAll(c);
    unconstrained_stacking_order.removeAll(c);
    stacking_order.removeAll(c);
    x_stacking_dirty = true;
    for (int i = 1; i <= numberOfDesktops(); ++i)
        focus_chain[i].removeAll(c);
    global_focus_chain.removeAll(c);
    attention_chain.removeAll(c);
    showing_desktop_clients.removeAll(c);
    Group* group = findGroup(c->window());
    if (group != NULL)
        group->lostLeader();

    if (c == most_recently_raised)
        most_recently_raised = 0;
    should_get_focus.removeAll(c);
    Q_ASSERT(c != active_client);
    if (c == last_active_client)
        last_active_client = 0;
    if (c == pending_take_activity)
        pending_take_activity = NULL;
    if (c == delayfocus_client)
        cancelDelayFocus();

    updateStackingOrder(true);

    updateCompositeBlocking();

#ifdef KWIN_BUILD_TABBOX
    if (tabBox()->isDisplayed())
        tab_box->reset(true);
#endif

    updateClientArea();
}

void Workspace::removeUnmanaged(Unmanaged* c, allowed_t)
{
    assert(unmanaged.contains(c));
    unmanaged.removeAll(c);
    x_stacking_dirty = true;
}

void Workspace::addDeleted(Deleted* c, allowed_t)
{
    assert(!deleted.contains(c));
    deleted.append(c);
    x_stacking_dirty = true;
}

void Workspace::removeDeleted(Deleted* c, allowed_t)
{
    assert(deleted.contains(c));
    if (scene)
        scene->windowDeleted(c);
    emit deletedRemoved(c);
    deleted.removeAll(c);
    x_stacking_dirty = true;
}

void Workspace::updateFocusChains(Client* c, FocusChainChange change)
{
    if (!c->wantsTabFocus()) { // Doesn't want tab focus, remove
        for (int i = 1; i <= numberOfDesktops(); ++i)
            focus_chain[i].removeAll(c);
        global_focus_chain.removeAll(c);
        return;
    }
    if (c->desktop() == NET::OnAllDesktops) {
        // Now on all desktops, add it to focus_chains it is not already in
        for (int i = 1; i <= numberOfDesktops(); i++) {
            // Making first/last works only on current desktop, don't affect all desktops
            if (i == currentDesktop()
                    && (change == FocusChainMakeFirst || change == FocusChainMakeLast)) {
                focus_chain[i].removeAll(c);
                if (change == FocusChainMakeFirst)
                    focus_chain[i].append(c);
                else
                    focus_chain[i].prepend(c);
            } else if (!focus_chain[i].contains(c)) {
                // Add it after the active one
                if (active_client != NULL && active_client != c &&
                        !focus_chain[i].isEmpty() && focus_chain[i].last() == active_client)
                    focus_chain[i].insert(focus_chain[i].size() - 1, c);
                else
                    focus_chain[i].append(c);   // Otherwise add as the first one
            }
        }
    } else { // Now only on desktop, remove it anywhere else
        for (int i = 1; i <= numberOfDesktops(); i++) {
            if (i == c->desktop()) {
                if (change == FocusChainMakeFirst) {
                    focus_chain[i].removeAll(c);
                    focus_chain[i].append(c);
                } else if (change == FocusChainMakeLast) {
                    focus_chain[i].removeAll(c);
                    focus_chain[i].prepend(c);
                } else if (!focus_chain[i].contains(c)) {
                    // Add it after the active one
                    if (active_client != NULL && active_client != c &&
                            !focus_chain[i].isEmpty() && focus_chain[i].last() == active_client)
                        focus_chain[i].insert(focus_chain[i].size() - 1, c);
                    else
                        focus_chain[i].append(c);   // Otherwise add as the first one
                }
            } else
                focus_chain[i].removeAll(c);
        }
    }
    if (change == FocusChainMakeFirst) {
        global_focus_chain.removeAll(c);
        global_focus_chain.append(c);
    } else if (change == FocusChainMakeLast) {
        global_focus_chain.removeAll(c);
        global_focus_chain.prepend(c);
    } else if (!global_focus_chain.contains(c)) {
        // Add it after the active one
        if (active_client != NULL && active_client != c &&
                !global_focus_chain.isEmpty() && global_focus_chain.last() == active_client)
            global_focus_chain.insert(global_focus_chain.size() - 1, c);
        else
            global_focus_chain.append(c);   // Otherwise add as the first one
    }
}

void Workspace::updateToolWindows(bool also_hide)
{
    // TODO: What if Client's transiency/group changes? should this be called too? (I'm paranoid, am I not?)
    if (!options->isHideUtilityWindowsForInactive()) {
        for (ClientList::ConstIterator it = clients.constBegin(); it != clients.constEnd(); ++it)
            if (!(*it)->tabGroup() || (*it)->tabGroup()->current() == *it)
                (*it)->hideClient(false);
        return;
    }
    const Group* group = NULL;
    const Client* client = active_client;
    // Go up in transiency hiearchy, if the top is found, only tool transients for the top mainwindow
    // will be shown; if a group transient is group, all tools in the group will be shown
    while (client != NULL) {
        if (!client->isTransient())
            break;
        if (client->groupTransient()) {
            group = client->group();
            break;
        }
        client = client->transientFor();
    }
    // Use stacking order only to reduce flicker, it doesn't matter if block_stacking_updates == 0,
    // I.e. if it's not up to date

    // SELI TODO: But maybe it should - what if a new client has been added that's not in stacking order yet?
    ClientList to_show, to_hide;
    for (ClientList::ConstIterator it = stacking_order.constBegin();
            it != stacking_order.constEnd();
            ++it) {
        if ((*it)->isUtility() || (*it)->isMenu() || (*it)->isToolbar()) {
            bool show = true;
            if (!(*it)->isTransient()) {
                if ((*it)->group()->members().count() == 1)   // Has its own group, keep always visible
                    show = true;
                else if (client != NULL && (*it)->group() == client->group())
                    show = true;
                else
                    show = false;
            } else {
                if (group != NULL && (*it)->group() == group)
                    show = true;
                else if (client != NULL && client->hasTransient((*it), true))
                    show = true;
                else
                    show = false;
            }
            if (!show && also_hide) {
                const ClientList mainclients = (*it)->mainClients();
                // Don't hide utility windows which are standalone(?) or
                // have e.g. kicker as mainwindow
                if (mainclients.isEmpty())
                    show = true;
                for (ClientList::ConstIterator it2 = mainclients.constBegin();
                        it2 != mainclients.constEnd();
                        ++it2) {
                    if ((*it2)->isSpecialWindow())
                        show = true;
                }
                if (!show)
                    to_hide.append(*it);
            }
            if (show)
                to_show.append(*it);
        }
    } // First show new ones, then hide
    for (int i = to_show.size() - 1;
            i >= 0;
            --i)  // From topmost
        // TODO: Since this is in stacking order, the order of taskbar entries changes :(
        to_show.at(i)->hideClient(false);
    if (also_hide) {
        for (ClientList::ConstIterator it = to_hide.constBegin();
                it != to_hide.constEnd();
                ++it)  // From bottommost
            (*it)->hideClient(true);
        updateToolWindowsTimer.stop();
    } else // setActiveClient() is after called with NULL client, quickly followed
        // by setting a new client, which would result in flickering
        resetUpdateToolWindowsTimer();
}


void Workspace::resetUpdateToolWindowsTimer()
{
    updateToolWindowsTimer.start(200);
}

void Workspace::slotUpdateToolWindows()
{
    updateToolWindows(true);
}

/**
 * Updates the current colormap according to the currently active client
 */
void Workspace::updateColormap()
{
    Colormap cmap = default_colormap;
    if (activeClient() && activeClient()->colormap() != None)
        cmap = activeClient()->colormap();
    if (cmap != installed_colormap) {
        XInstallColormap(display(), cmap);
        installed_colormap = cmap;
    }
}

void Workspace::slotReloadConfig()
{
    reconfigure();
}

void Workspace::reconfigure()
{
    reconfigureTimer.start(200);
}

/**
 * This D-Bus call is used by the compositing kcm. Since the reconfigure()
 * D-Bus call delays the actual reconfiguring, it is not possible to immediately
 * call compositingActive(). Therefore the kcm will instead call this to ensure
 * the reconfiguring has already happened.
 */
bool Workspace::waitForCompositingSetup()
{
    if (reconfigureTimer.isActive()) {
        reconfigureTimer.stop();
        slotReconfigure();
    }
    return compositingActive();
}

void Workspace::slotSettingsChanged(int category)
{
    kDebug(1212) << "Workspace::slotSettingsChanged()";
    if (category == KGlobalSettings::SETTINGS_SHORTCUTS)
        discardPopup();
}

/**
 * Reread settings
 */
KWIN_PROCEDURE(CheckBorderSizesProcedure, Client, cl->checkBorderSizes(true));

void Workspace::slotReconfigure()
{
    kDebug(1212) << "Workspace::slotReconfigure()";
    reconfigureTimer.stop();

#ifdef KWIN_BUILD_SCREENEDGES
    m_screenEdge.reserveActions(false);
    if (options->electricBorders() == Options::ElectricAlways)
        m_screenEdge.reserveDesktopSwitching(false);
#endif

    bool borderlessMaximizedWindows = options->borderlessMaximizedWindows();

    KGlobal::config()->reparseConfiguration();
    unsigned long changed = options->updateSettings();

    emit configChanged();
    initPositioning->reinitCascading(0);
    discardPopup();
    forEachClient(CheckIgnoreFocusStealingProcedure());
    updateToolWindows(true);

    if (hasDecorationPlugin() && mgr->reset(changed)) {
        // Decorations need to be recreated

        // This actually seems to make things worse now
        //QWidget curtain;
        //curtain.setBackgroundMode( NoBackground );
        //curtain.setGeometry( Kephal::ScreenUtils::desktopGeometry() );
        //curtain.show();

        for (ClientList::ConstIterator it = clients.constBegin(); it != clients.constEnd(); ++it)
            (*it)->updateDecoration(true, true);
        // If the new decoration doesn't supports tabs then ungroup clients
        if (!decorationSupportsTabbing()) {
            foreach (Client * c, clients)
                c->untab();
        }
        mgr->destroyPreviousPlugin();
    } else {
        forEachClient(CheckBorderSizesProcedure());
        foreach (Client * c, clients)
            c->triggerDecorationRepaint();
    }

#ifdef KWIN_BUILD_SCREENEDGES
    m_screenEdge.reserveActions(true);
    if (options->electricBorders() == Options::ElectricAlways)
        m_screenEdge.reserveDesktopSwitching(true);
    m_screenEdge.update();
#endif

    if (!compositingSuspended) {
        setupCompositing();
        if (effects)   // setupCompositing() may fail
            effects->reconfigure();
        addRepaintFull();
    } else
        finishCompositing();

    loadWindowRules();
    for (ClientList::Iterator it = clients.begin();
            it != clients.end();
            ++it) {
        (*it)->setupWindowRules(true);
        (*it)->applyWindowRules();
        discardUsedWindowRules(*it, false);
    }

    if (borderlessMaximizedWindows != options->borderlessMaximizedWindows() &&
            !options->borderlessMaximizedWindows()) {
        // in case borderless maximized windows option changed and new option
        // is to have borders, we need to unset the borders for all maximized windows
        for (ClientList::Iterator it = clients.begin();
                it != clients.end();
                ++it) {
            if ((*it)->maximizeMode() == MaximizeFull)
                (*it)->checkNoBorder();
        }
    }

#ifdef KWIN_BUILD_TILING
    m_tiling->setEnabled(options->isTilingOn());
    // just so that we reset windows in the right manner, 'activate' the current active window
    m_tiling->notifyTilingWindowActivated(activeClient());
#endif
    if (hasDecorationPlugin()) {
        rootInfo->setSupported(NET::WM2FrameOverlap, mgr->factory()->supports(AbilityExtendIntoClientArea));
    } else {
        rootInfo->setSupported(NET::WM2FrameOverlap, false);
    }
}

void Workspace::restartKWin(const QString &reason)
{
    kDebug(1212) << "restarting kwin for:" << reason;
    char cmd[1024]; // copied from crashhandler - maybe not the best way to do?
    sprintf(cmd, "%s --replace &", QFile::encodeName(QCoreApplication::applicationFilePath()).constData());
    system(cmd);
}

void Workspace::slotReinitCompositing()
{
    // Reparse config. Config options will be reloaded by setupCompositing()
    KGlobal::config()->reparseConfiguration();
    const QString graphicsSystem = KConfigGroup(KSharedConfig::openConfig("kwinrc"), "Compositing").readEntry("GraphicsSystem", "");
    if ((Extensions::nonNativePixmaps() && graphicsSystem == "native") ||
        (!Extensions::nonNativePixmaps() && (graphicsSystem == "raster" || graphicsSystem == "raster")) ) {
        restartKWin("explicitly reconfigured graphicsSystem change");
        return;
    }

    // Update any settings that can be set in the compositing kcm.
#ifdef KWIN_BUILD_SCREENEDGES
    m_screenEdge.update();
#endif

    // Restart compositing
    finishCompositing();

    // resume compositing if suspended
    compositingSuspended = false;
    options->setCompositingInitialized(false);
    setupCompositing();
    if (hasDecorationPlugin()) {
        KDecorationFactory* factory = mgr->factory();
        factory->reset(SettingCompositing);
    }

    if (effects) { // setupCompositing() may fail
        effects->reconfigure();
        emit compositingToggled(true);
    }
}

static bool _loading_desktop_settings = false;
void Workspace::loadDesktopSettings()
{
    _loading_desktop_settings = true;
    KSharedConfig::Ptr c = KGlobal::config();
    QString groupname;
    if (screen_number == 0)
        groupname = "Desktops";
    else
        groupname.sprintf("Desktops-screen-%d", screen_number);
    KConfigGroup group(c, groupname);
    const int n = group.readEntry("Number", 1);
    setNumberOfDesktops(n);
    for (int i = 1; i <= n; i++) {
        QString s = group.readEntry(QString("Name_%1").arg(i), i18n("Desktop %1", i));
        rootInfo->setDesktopName(i, s.toUtf8().data());
        desktop_focus_chain[i-1] = i;
    }

    int rows = group.readEntry<int>("Rows", 2);
    rows = qBound(1, rows, n);
    // avoid weird cases like having 3 rows for 4 desktops, where the last row is unused
    int columns = n / rows;
    if (n % rows > 0) {
        columns++;
    }
    rootInfo->setDesktopLayout(NET::OrientationHorizontal, columns, rows, NET::DesktopLayoutCornerTopLeft);
    rootInfo->activate();
    _loading_desktop_settings = false;
}

void Workspace::saveDesktopSettings()
{
    if (_loading_desktop_settings)
        return;
    KSharedConfig::Ptr c = KGlobal::config();
    QString groupname;
    if (screen_number == 0)
        groupname = "Desktops";
    else
        groupname.sprintf("Desktops-screen-%d", screen_number);
    KConfigGroup group(c, groupname);

    group.writeEntry("Number", numberOfDesktops());
    for (int i = 1; i <= numberOfDesktops(); i++) {
        QString s = desktopName(i);
        QString defaultvalue = i18n("Desktop %1", i);
        if (s.isEmpty()) {
            s = defaultvalue;
            rootInfo->setDesktopName(i, s.toUtf8().data());
        }

        if (s != defaultvalue) {
            group.writeEntry(QString("Name_%1").arg(i), s);
        } else {
            QString currentvalue = group.readEntry(QString("Name_%1").arg(i), QString());
            if (currentvalue != defaultvalue)
                group.writeEntry(QString("Name_%1").arg(i), "");
        }
    }

    // Save to disk
    group.sync();
}

QStringList Workspace::configModules(bool controlCenter)
{
    QStringList args;
    args <<  "kwindecoration";
    if (controlCenter)
        args << "kwinoptions";
    else if (KAuthorized::authorizeControlModule("kde-kwinoptions.desktop"))
        args << "kwinactions" << "kwinfocus" <<  "kwinmoving" << "kwinadvanced"
             << "kwinrules" << "kwincompositing"
#ifdef KWIN_BUILD_TABBOX
             << "kwintabbox"
#endif
#ifdef KWIN_BUILD_SCREENEDGES
             << "kwinscreenedges"
#endif
#ifdef KWIN_BUILD_SCRIPTING
             << "kwinscripts"
#endif
             ;
    return args;
}

void Workspace::configureWM()
{
    QStringList args;
    args << "--icon" << "preferences-system-windows" << configModules(false);
    KToolInvocation::kdeinitExec("kcmshell4", args);
}

/**
 * Avoids managing a window with title \a title
 */
void Workspace::doNotManage(const QString& title)
{
    doNotManageList.append(title);
}

/**
 * Hack for java applets
 */
bool Workspace::isNotManaged(const QString& title)
{
    for (QStringList::Iterator it = doNotManageList.begin(); it != doNotManageList.end(); ++it) {
        QRegExp r((*it));
        if (r.indexIn(title) != -1) {
            doNotManageList.erase(it);
            return true;
        }
    }
    return false;
}

/**
 * Refreshes all the client windows
 */
void Workspace::refresh()
{
    QWidget w(NULL, Qt::X11BypassWindowManagerHint);
    w.setGeometry(Kephal::ScreenUtils::desktopGeometry());
    w.show();
    w.hide();
    QApplication::flush();
}

/**
 * During virt. desktop switching, desktop areas covered by windows that are
 * going to be hidden are first obscured by new windows with no background
 * ( i.e. transparent ) placed right below the windows. These invisible windows
 * are removed after the switch is complete.
 * Reduces desktop ( wallpaper ) repaints during desktop switching
 */
class ObscuringWindows
{
public:
    ~ObscuringWindows();
    void create(Client* c);
private:
    QList<Window> obscuring_windows;
    static QList<Window>* cached;
    static unsigned int max_cache_size;
};

QList<Window>* ObscuringWindows::cached = 0;
unsigned int ObscuringWindows::max_cache_size = 0;

void ObscuringWindows::create(Client* c)
{
    if (compositing())
        return; // Not needed with compositing
    if (cached == 0)
        cached = new QList<Window>;
    Window obs_win;
    XWindowChanges chngs;
    int mask = CWSibling | CWStackMode;
    if (cached->count() > 0) {
        cached->removeAll(obs_win = cached->first());
        chngs.x = c->x();
        chngs.y = c->y();
        chngs.width = c->width();
        chngs.height = c->height();
        mask |= CWX | CWY | CWWidth | CWHeight;
    } else {
        XSetWindowAttributes a;
        a.background_pixmap = None;
        a.override_redirect = True;
        obs_win = XCreateWindow(display(), rootWindow(), c->x(), c->y(),
                                c->width(), c->height(), 0, CopyFromParent, InputOutput,
                                CopyFromParent, CWBackPixmap | CWOverrideRedirect, &a);
    }
    chngs.sibling = c->frameId();
    chngs.stack_mode = Below;
    XConfigureWindow(display(), obs_win, mask, &chngs);
    XMapWindow(display(), obs_win);
    obscuring_windows.append(obs_win);
}

ObscuringWindows::~ObscuringWindows()
{
    max_cache_size = qMax(int(max_cache_size), obscuring_windows.count() + 4) - 1;
    for (QList<Window>::ConstIterator it = obscuring_windows.constBegin();
            it != obscuring_windows.constEnd();
            ++it) {
        XUnmapWindow(display(), *it);
        if (cached->count() < int(max_cache_size))
            cached->prepend(*it);
        else
            XDestroyWindow(display(), *it);
    }
}

/**
 * Sets the current desktop to \a new_desktop
 *
 * Shows/Hides windows according to the stacking order and finally
 * propages the new desktop to the world
 */
bool Workspace::setCurrentDesktop(int new_desktop)
{
    if (new_desktop < 1 || new_desktop > numberOfDesktops())
        return false;

    closeActivePopup();
    ++block_focus;
    // TODO: Q_ASSERT( block_stacking_updates == 0 ); // Make sure stacking_order is up to date
    StackingUpdatesBlocker blocker(this);

    int old_desktop = currentDesktop();
    int old_active_screen = activeScreen();
    if (new_desktop != currentDesktop()) {
        ++block_showing_desktop;
        // Optimized Desktop switching: unmapping done from back to front
        // mapping done from front to back => less exposure events
        Notify::raise((Notify::Event)(Notify::DesktopChange + new_desktop));

        ObscuringWindows obs_wins;

        currentDesktop_ = new_desktop; // Change the desktop (so that Client::updateVisibility() works)

        for (ClientList::ConstIterator it = stacking_order.constBegin();
                it != stacking_order.constEnd();
                ++it)
            if (!(*it)->isOnDesktop(new_desktop) && (*it) != movingClient && (*it)->isOnCurrentActivity()) {
                if ((*it)->isShown(true) && (*it)->isOnDesktop(old_desktop))
                    obs_wins.create(*it);
                (*it)->updateVisibility();
            }

        // Now propagate the change, after hiding, before showing
        rootInfo->setCurrentDesktop(currentDesktop());

        // if the client is moved to another desktop, that desktop may
        // not have an existing layout. In addition this tiling layout
        // will require rearrangement, so notify about desktop changes.
        if (movingClient && !movingClient->isOnDesktop(new_desktop)) {
            int old_desktop = movingClient->desktop();
            movingClient->setDesktop(new_desktop);
#ifdef KWIN_BUILD_TILING
            if (m_tiling->isEnabled()) {
                m_tiling->notifyTilingWindowDesktopChanged(movingClient, old_desktop);
            }
#else
    Q_UNUSED(old_desktop)
#endif
        }

        for (int i = stacking_order.size() - 1; i >= 0 ; --i)
            if (stacking_order.at(i)->isOnDesktop(new_desktop) && stacking_order.at(i)->isOnCurrentActivity())
                stacking_order.at(i)->updateVisibility();

        --block_showing_desktop;
        if (showingDesktop())   // Do this only after desktop change to avoid flicker
            resetShowingDesktop(false);
    }

    // Restore the focus on this desktop
    --block_focus;
    Client* c = 0;

    if (options->focusPolicyIsReasonable()) {
        // Search in focus chain
        if (movingClient != NULL && active_client == movingClient &&
                focus_chain[currentDesktop()].contains(active_client) &&
                active_client->isShown(true) && active_client->isOnCurrentDesktop())
            c = active_client; // The requestFocus below will fail, as the client is already active
        // from actiavtion.cpp
        if (!c && options->isNextFocusPrefersMouse()) {
            QList<Client*>::const_iterator it = stackingOrder().constEnd();
            while (it != stackingOrder().constBegin()) {
                Client *client = *(--it);

                if (!(client->isShown(false) && client->isOnDesktop(new_desktop) &&
                    client->isOnCurrentActivity() && client->isOnScreen(activeScreen())))
                    continue;

                if (client->geometry().contains(QCursor::pos())) {
                    if (!client->isDesktop())
                        c = client;
                break; // unconditional break  - we do not pass the focus to some client below an unusable one
                }
            }
        }
        if (!c) {
            for (int i = focus_chain[currentDesktop()].size() - 1; i >= 0; --i) {
                Client* tmp = focus_chain[currentDesktop()].at(i);
                if (tmp->isShown(false) && tmp->isOnCurrentActivity()
                    && ( !options->isSeparateScreenFocus() || tmp->screen() == old_active_screen )) {
                    c = tmp;
                    break;
                }
            }
        }
    }
    // If "unreasonable focus policy" and active_client is on_all_desktops and
    // under mouse (Hence == old_active_client), conserve focus.
    // (Thanks to Volker Schatz <V.Schatz at thphys.uni-heidelberg.de>)
    else if (active_client && active_client->isShown(true) && active_client->isOnCurrentDesktop())
        c = active_client;

    if (c == NULL && !desktops.isEmpty())
        c = findDesktop(true, currentDesktop());

    if (c != active_client)
        setActiveClient(NULL, Allowed);

    if (c)
        requestFocus(c);
    else if (!desktops.isEmpty())
        requestFocus(findDesktop(true, currentDesktop()));
    else
        focusToNull();

    // Update focus chain:
    //  If input: chain = { 1, 2, 3, 4 } and currentDesktop() = 3,
    //   Output: chain = { 3, 1, 2, 4 }.
    //kDebug(1212) << QString("Switching to desktop #%1, at focus_chain index %2\n")
    //    .arg(currentDesktop()).arg(desktop_focus_chain.find( currentDesktop() ));
    for (int i = desktop_focus_chain.indexOf(currentDesktop()); i > 0; i--)
        desktop_focus_chain[i] = desktop_focus_chain[i-1];
    desktop_focus_chain[0] = currentDesktop();

    //QString s = "desktop_focus_chain[] = { ";
    //for ( uint i = 0; i < desktop_focus_chain.size(); i++ )
    //    s += QString::number( desktop_focus_chain[i] ) + ", ";
    //kDebug( 1212 ) << s << "}\n";

    if (compositing())
        addRepaintFull();

    emit currentDesktopChanged(old_desktop);
    return true;
}

/**
 * Updates the current activity when it changes
 * do *not* call this directly; it does not set the activity.
 *
 * Shows/Hides windows according to the stacking order
 */
void Workspace::updateCurrentActivity(const QString &new_activity)
{

    //closeActivePopup();
    ++block_focus;
    // TODO: Q_ASSERT( block_stacking_updates == 0 ); // Make sure stacking_order is up to date
    StackingUpdatesBlocker blocker(this);

    if (new_activity != activity_) {
        ++block_showing_desktop; //FIXME should I be using that?
        // Optimized Desktop switching: unmapping done from back to front
        // mapping done from front to back => less exposure events
        //Notify::raise((Notify::Event) (Notify::DesktopChange+new_desktop));

        ObscuringWindows obs_wins;

        QString old_activity = activity_;
        activity_ = new_activity;

        for (ClientList::ConstIterator it = stacking_order.constBegin();
                it != stacking_order.constEnd();
                ++it)
            if (!(*it)->isOnActivity(new_activity) && (*it) != movingClient && (*it)->isOnCurrentDesktop()) {
                if ((*it)->isShown(true) && (*it)->isOnActivity(old_activity))
                    obs_wins.create(*it);
                (*it)->updateVisibility();
            }

        // Now propagate the change, after hiding, before showing
        //rootInfo->setCurrentDesktop( currentDesktop() );

        /* TODO someday enable dragging windows to other activities
        if ( movingClient && !movingClient->isOnDesktop( new_desktop ))
            {
            int old_desktop = movingClient->desktop();
            movingClient->setDesktop( new_desktop );
            if ( tilingEnabled() )
                {
                notifyWindowDesktopChanged( movingClient, old_desktop );
                }
            }
            */

        for (int i = stacking_order.size() - 1; i >= 0 ; --i)
            if (stacking_order.at(i)->isOnActivity(new_activity))
                stacking_order.at(i)->updateVisibility();

        --block_showing_desktop;
        //FIXME not sure if I should do this either
        if (showingDesktop())   // Do this only after desktop change to avoid flicker
            resetShowingDesktop(false);
    }

    // Restore the focus on this desktop
    --block_focus;
    Client* c = 0;

    //FIXME below here is a lot of focuschain stuff, probably all wrong now
    if (options->focusPolicyIsReasonable()) {
        // Search in focus chain
        if (movingClient != NULL && active_client == movingClient &&
                focus_chain[currentDesktop()].contains(active_client) &&
                active_client->isShown(true) && active_client->isOnCurrentDesktop())
            c = active_client; // The requestFocus below will fail, as the client is already active
        if (!c) {
            for (int i = focus_chain[currentDesktop()].size() - 1; i >= 0; --i) {
                if (focus_chain[currentDesktop()].at(i)->isShown(false) &&
                        focus_chain[currentDesktop()].at(i)->isOnCurrentActivity()) {
                    c = focus_chain[currentDesktop()].at(i);
                    break;
                }
            }
        }
    }
    // If "unreasonable focus policy" and active_client is on_all_desktops and
    // under mouse (Hence == old_active_client), conserve focus.
    // (Thanks to Volker Schatz <V.Schatz at thphys.uni-heidelberg.de>)
    else if (active_client && active_client->isShown(true) && active_client->isOnCurrentDesktop() && active_client->isOnCurrentActivity())
        c = active_client;

    if (c == NULL && !desktops.isEmpty())
        c = findDesktop(true, currentDesktop());

    if (c != active_client)
        setActiveClient(NULL, Allowed);

    if (c)
        requestFocus(c);
    else if (!desktops.isEmpty())
        requestFocus(findDesktop(true, currentDesktop()));
    else
        focusToNull();

    // Update focus chain:
    //  If input: chain = { 1, 2, 3, 4 } and currentDesktop() = 3,
    //   Output: chain = { 3, 1, 2, 4 }.
    //kDebug(1212) << QString("Switching to desktop #%1, at focus_chain index %2\n")
    //    .arg(currentDesktop()).arg(desktop_focus_chain.find( currentDesktop() ));
    for (int i = desktop_focus_chain.indexOf(currentDesktop()); i > 0; i--)
        desktop_focus_chain[i] = desktop_focus_chain[i-1];
    desktop_focus_chain[0] = currentDesktop();

    //QString s = "desktop_focus_chain[] = { ";
    //for ( uint i = 0; i < desktop_focus_chain.size(); i++ )
    //    s += QString::number( desktop_focus_chain[i] ) + ", ";
    //kDebug( 1212 ) << s << "}\n";

    // Not for the very first time, only if something changed and there are more than 1 desktops

    //if ( effects != NULL && old_desktop != 0 && old_desktop != new_desktop )
    //    static_cast<EffectsHandlerImpl*>( effects )->desktopChanged( old_desktop );
    if (compositing())
        addRepaintFull();

}

/**
 * updates clients when an activity is destroyed.
 * this ensures that a client does not get 'lost' if the only activity it's on is removed.
 */
void Workspace::activityRemoved(const QString &activity)
{
    allActivities_.removeOne(activity);
    foreach (Client * client, stacking_order) {
        client->setOnActivity(activity, false);
    }
    //toss out any session data for it
    KConfigGroup cg(KGlobal::config(), QString("SubSession: ") + activity);
    cg.deleteGroup();
}

void Workspace::activityAdded(const QString &activity)
{
    allActivities_ << activity;
}

/**
 * Called only from D-Bus
 */
void Workspace::nextDesktop()
{
    int desktop = currentDesktop() + 1;
    setCurrentDesktop(desktop > numberOfDesktops() ? 1 : desktop);
}

/**
 * Called only from D-Bus
 */
void Workspace::previousDesktop()
{
    int desktop = currentDesktop() - 1;
    setCurrentDesktop(desktop > 0 ? desktop : numberOfDesktops());
}

/**
 * Sets the number of virtual desktops to \a n
 */
void Workspace::setNumberOfDesktops(int n)
{
    if (n > KWIN_MAX_NUMBER_DESKTOPS)
        n = KWIN_MAX_NUMBER_DESKTOPS;
    if (n < 1 || n == numberOfDesktops())
        return;
    int old_number_of_desktops = numberOfDesktops();
    desktopCount_ = n;
    updateDesktopLayout(); // Make sure the layout is still valid

    if (currentDesktop() > n)
        setCurrentDesktop(n);

    // move all windows that would be hidden to the last visible desktop
    if (old_number_of_desktops > numberOfDesktops()) {
        for (ClientList::ConstIterator it = clients.constBegin(); it != clients.constEnd(); ++it) {
            if (!(*it)->isOnAllDesktops() && (*it)->desktop() > numberOfDesktops())
                sendClientToDesktop(*it, numberOfDesktops(), true);
            // TODO: Tile should have a method allClients, push them into other tiles
        }
    }
    rootInfo->setNumberOfDesktops(n);
    NETPoint* viewports = new NETPoint[n];
    rootInfo->setDesktopViewport(n, *viewports);
    delete[] viewports;

    // Make it +1, so that it can be accessed as [1..numberofdesktops]
    focus_chain.resize(n + 1);

    workarea.clear();
    workarea.resize(n + 1);
    restrictedmovearea.clear();
    restrictedmovearea.resize(n + 1);
    screenarea.clear();

    updateClientArea(true);

    // Resize and reset the desktop focus chain.
    desktop_focus_chain.resize(n);
    for (int i = 0; i < int(desktop_focus_chain.size()); i++)
        desktop_focus_chain[i] = i + 1;

    saveDesktopSettings();
    emit numberDesktopsChanged(old_number_of_desktops);
}

/**
 * Sends client \a c to desktop \a desk.
 *
 * Takes care of transients as well.
 */
void Workspace::sendClientToDesktop(Client* c, int desk, bool dont_activate)
{
    if ((desk < 1 && desk != NET::OnAllDesktops) || desk > numberOfDesktops())
        return;
    int old_desktop = c->desktop();
    bool was_on_desktop = c->isOnDesktop(desk) || c->isOnAllDesktops();
    c->setDesktop(desk);
    if (c->desktop() != desk)   // No change or desktop forced
        return;
    desk = c->desktop(); // Client did range checking

    emit desktopPresenceChanged(c, old_desktop);

    if (c->isOnDesktop(currentDesktop())) {
        if (c->wantsTabFocus() && options->focusPolicyIsReasonable() &&
                !was_on_desktop && // for stickyness changes
                !dont_activate)
            requestFocus(c);
        else
            restackClientUnderActive(c);
    } else
        raiseClient(c);

#ifdef KWIN_BUILD_TILING
    m_tiling->notifyTilingWindowDesktopChanged(c, old_desktop);
#endif
    c->checkWorkspacePosition( QRect(), old_desktop );

    ClientList transients_stacking_order = ensureStackingOrder(c->transients());
    for (ClientList::ConstIterator it = transients_stacking_order.constBegin();
            it != transients_stacking_order.constEnd();
            ++it)
        sendClientToDesktop(*it, desk, dont_activate);
    updateClientArea();
}

/**
 * Adds/removes client \a c to/from \a activity.
 *
 * Takes care of transients as well.
 */
void Workspace::toggleClientOnActivity(Client* c, const QString &activity, bool dont_activate)
{
    //int old_desktop = c->desktop();
    bool was_on_activity = c->isOnActivity(activity);
    bool was_on_all = c->isOnAllActivities();
    //note: all activities === no activities
    bool enable = was_on_all || !was_on_activity;
    c->setOnActivity(activity, enable);
    if (c->isOnActivity(activity) == was_on_activity && c->isOnAllActivities() == was_on_all)   // No change
        return;

    if (c->isOnCurrentActivity()) {
        if (c->wantsTabFocus() && options->focusPolicyIsReasonable() &&
                !was_on_activity && // for stickyness changes
                //FIXME not sure if the line above refers to the correct activity
                !dont_activate)
            requestFocus(c);
        else
            restackClientUnderActive(c);
    } else
        raiseClient(c);

    //notifyWindowDesktopChanged( c, old_desktop );
    //FIXME does tiling break?

    ClientList transients_stacking_order = ensureStackingOrder(c->transients());
    for (ClientList::ConstIterator it = transients_stacking_order.constBegin();
            it != transients_stacking_order.constEnd();
            ++it)
        toggleClientOnActivity(*it, activity, dont_activate);
    updateClientArea();
}

int Workspace::numScreens() const
{
    return Kephal::ScreenUtils::numScreens();
}

int Workspace::activeScreen() const
{
    if (!options->isActiveMouseScreen()) {
        if (activeClient() != NULL && !activeClient()->isOnScreen(active_screen))
            return activeClient()->screen();
        return active_screen;
    }
    return Kephal::ScreenUtils::screenId(cursorPos());
}

/**
 * Check whether a client moved completely out of what's considered the active screen,
 * if yes, set a new active screen.
 */
void Workspace::checkActiveScreen(const Client* c)
{
    if (!c->isActive())
        return;
    if (!c->isOnScreen(active_screen))
        active_screen = c->screen();
}

/**
 * Called e.g. when a user clicks on a window, set active screen to be the screen
 * where the click occurred
 */
void Workspace::setActiveScreenMouse(const QPoint& mousepos)
{
    active_screen = Kephal::ScreenUtils::screenId(mousepos);
}

QRect Workspace::screenGeometry(int screen) const
{
    return Kephal::ScreenUtils::screenGeometry(screen);
}

int Workspace::screenNumber(const QPoint& pos) const
{
    return Kephal::ScreenUtils::screenId(pos);
}

void Workspace::sendClientToScreen(Client* c, int screen)
{
    if (c->screen() == screen)   // Don't use isOnScreen(), that's true even when only partially
        return;
    GeometryUpdatesBlocker blocker(c);
    QRect old_sarea = clientArea(MaximizeArea, c);
    QRect sarea = clientArea(MaximizeArea, screen, c->desktop());
    QRect oldgeom = c->geometry();
    QRect geom = c->geometry();
    // move the window to have the same relative position to the center of the screen
    // (i.e. one near the middle of the right edge will also end up near the middle of the right edge)
    geom.moveCenter(
        QPoint(( geom.center().x() - old_sarea.center().x()) * sarea.width() / old_sarea.width() + sarea.center().x(),
            ( geom.center().y() - old_sarea.center().y()) * sarea.height() / old_sarea.height() + sarea.center().y()));
    c->setGeometry( geom );
    // If the window was inside the old screen area, explicitly make sure its inside also the new screen area.
    // Calling checkWorkspacePosition() should ensure that, but when moving to a small screen the window could
    // be big enough to overlap outside of the new screen area, making struts from other screens come into effect,
    // which could alter the resulting geometry.
    if( old_sarea.contains( oldgeom ))
        c->keepInArea( sarea );
    c->checkWorkspacePosition( oldgeom );
    ClientList transients_stacking_order = ensureStackingOrder(c->transients());
    for (ClientList::ConstIterator it = transients_stacking_order.constBegin();
            it != transients_stacking_order.constEnd();
            ++it)
        sendClientToScreen(*it, screen);
    if (c->isActive())
        active_screen = screen;
}

void Workspace::killWindowId(Window window_to_kill)
{
    if (window_to_kill == None)
        return;
    Window window = window_to_kill;
    Client* client = NULL;
    for (;;) {
        client = findClient(FrameIdMatchPredicate(window));
        if (client != NULL)
            break; // Found the client
        Window parent, root;
        Window* children;
        unsigned int children_count;
        XQueryTree(display(), window, &root, &parent, &children, &children_count);
        if (children != NULL)
            XFree(children);
        if (window == root)   // We didn't find the client, probably an override-redirect window
            break;
        window = parent; // Go up
    }
    if (client != NULL)
        client->killWindow();
    else
        XKillClient(display(), window_to_kill);
}

void Workspace::sendPingToWindow(Window window, Time timestamp)
{
    rootInfo->sendPing(window, timestamp);
}

void Workspace::sendTakeActivity(Client* c, Time timestamp, long flags)
{
    rootInfo->takeActivity(c->window(), timestamp, flags);
    pending_take_activity = c;
}

/**
 * Delayed focus functions
 */
void Workspace::delayFocus()
{
    requestFocus(delayfocus_client);
    cancelDelayFocus();
}

void Workspace::requestDelayFocus(Client* c)
{
    delayfocus_client = c;
    delete delayFocusTimer;
    delayFocusTimer = new QTimer(this);
    connect(delayFocusTimer, SIGNAL(timeout()), this, SLOT(delayFocus()));
    delayFocusTimer->setSingleShot(true);
    delayFocusTimer->start(options->delayFocusInterval());
}

void Workspace::cancelDelayFocus()
{
    delete delayFocusTimer;
    delayFocusTimer = 0;
}

KDecoration* Workspace::createDecoration(KDecorationBridge* bridge)
{
    if (!hasDecorationPlugin()) {
        return NULL;
    }
    return mgr->createDecoration(bridge);
}

/**
 * Returns a list of all colors (KDecorationDefines::ColorType) the current
 * decoration supports
 */
QList<int> Workspace::decorationSupportedColors() const
{
    QList<int> ret;
    if (!hasDecorationPlugin()) {
        return ret;
    }
    KDecorationFactory* factory = mgr->factory();
    for (Ability ab = ABILITYCOLOR_FIRST;
            ab < ABILITYCOLOR_END;
            ab = static_cast<Ability>(ab + 1))
        if (factory->supports(ab))
            ret << ab;
    return ret;
}

QString Workspace::desktopName(int desk) const
{
    return QString::fromUtf8(rootInfo->desktopName(desk));
}

bool Workspace::checkStartupNotification(Window w, KStartupInfoId& id, KStartupInfoData& data)
{
    return startup->checkStartup(w, id, data) == KStartupInfo::Match;
}

/**
 * Puts the focus on a dummy window
 * Just using XSetInputFocus() with None would block keyboard input
 */
void Workspace::focusToNull()
{
    XSetInputFocus(display(), null_focus_window, RevertToPointerRoot, xTime());
}

void Workspace::helperDialog(const QString& message, const Client* c)
{
    QStringList args;
    QString type;
    if (message == "noborderaltf3") {
        KAction* action = qobject_cast<KAction*>(keys->action("Window Operations Menu"));
        assert(action != NULL);
        QString shortcut = QString("%1 (%2)").arg(action->text())
                           .arg(action->globalShortcut().primary().toString(QKeySequence::NativeText));
        args << "--msgbox" << i18n(
                 "You have selected to show a window without its border.\n"
                 "Without the border, you will not be able to enable the border "
                 "again using the mouse: use the window operations menu instead, "
                 "activated using the %1 keyboard shortcut.",
                 shortcut);
        type = "altf3warning";
    } else if (message == "fullscreenaltf3") {
        KAction* action = qobject_cast<KAction*>(keys->action("Window Operations Menu"));
        assert(action != NULL);
        QString shortcut = QString("%1 (%2)").arg(action->text())
                           .arg(action->globalShortcut().primary().toString(QKeySequence::NativeText));
        args << "--msgbox" << i18n(
                 "You have selected to show a window in fullscreen mode.\n"
                 "If the application itself does not have an option to turn the fullscreen "
                 "mode off you will not be able to disable it "
                 "again using the mouse: use the window operations menu instead, "
                 "activated using the %1 keyboard shortcut.",
                 shortcut);
        type = "altf3warning";
    } else
        abort();
    if (!type.isEmpty()) {
        KConfig cfg("kwin_dialogsrc");
        KConfigGroup cg(&cfg, "Notification Messages");  // Depends on KMessageBox
        if (!cg.readEntry(type, true))
            return;
        args << "--dontagain" << "kwin_dialogsrc:" + type;
    }
    if (c != NULL)
        args << "--embed" << QString::number(c->window());
    KProcess::startDetached("kdialog", args);
}

void Workspace::setShowingDesktop(bool showing)
{
    rootInfo->setShowingDesktop(showing);
    showing_desktop = showing;
    ++block_showing_desktop;
    if (showing_desktop) {
        showing_desktop_clients.clear();
        ++block_focus;
        ClientList cls = stackingOrder();
        // Find them first, then minimize, otherwise transients may get minimized with the window
        // they're transient for
        for (ClientList::ConstIterator it = cls.constBegin();
                it != cls.constEnd();
                ++it)
            if ((*it)->isOnCurrentActivity() && (*it)->isOnCurrentDesktop() && (*it)->isShown(true) && !(*it)->isSpecialWindow())
                showing_desktop_clients.prepend(*it);   // Topmost first to reduce flicker
        for (ClientList::ConstIterator it = showing_desktop_clients.constBegin();
                it != showing_desktop_clients.constEnd();
                ++it)
            (*it)->minimize();
        --block_focus;
        if (Client* desk = findDesktop(true, currentDesktop()))
            requestFocus(desk);
    } else {
        for (ClientList::ConstIterator it = showing_desktop_clients.constBegin();
                it != showing_desktop_clients.constEnd();
                ++it)
            (*it)->unminimize();
        if (showing_desktop_clients.count() > 0)
            requestFocus(showing_desktop_clients.first());
        showing_desktop_clients.clear();
    }
    --block_showing_desktop;
}

/**
 * Following Kicker's behavior:
 * Changing a virtual desktop resets the state and shows the windows again.
 * Unminimizing a window resets the state but keeps the windows hidden (except
 * the one that was unminimized).
 * A new window resets the state and shows the windows again, with the new window
 * being active. Due to popular demand (#67406) by people who apparently
 * don't see a difference between "show desktop" and "minimize all", this is not
 * true if "showDesktopIsMinimizeAll" is set in kwinrc. In such case showing
 * a new window resets the state but doesn't show windows.
 */
void Workspace::resetShowingDesktop(bool keep_hidden)
{
    if (block_showing_desktop > 0)
        return;
    rootInfo->setShowingDesktop(false);
    showing_desktop = false;
    ++block_showing_desktop;
    if (!keep_hidden) {
        for (ClientList::ConstIterator it = showing_desktop_clients.constBegin();
                it != showing_desktop_clients.constEnd();
                ++it)
            (*it)->unminimize();
    }
    showing_desktop_clients.clear();
    --block_showing_desktop;
}

/**
 * Activating/deactivating this feature works like this:
 * When nothing is active, and the shortcut is pressed, global shortcuts are disabled
 *     (using global_shortcuts_disabled)
 * When a window that has disabling forced is activated, global shortcuts are disabled.
 *     (using global_shortcuts_disabled_for_client)
 * When a shortcut is pressed and global shortcuts are disabled (either by a shortcut
 * or for a client), they are enabled again.
 */
void Workspace::slotDisableGlobalShortcuts()
{
    if (global_shortcuts_disabled || global_shortcuts_disabled_for_client)
        disableGlobalShortcuts(false);
    else
        disableGlobalShortcuts(true);
}

static bool pending_dfc = false;

void Workspace::disableGlobalShortcutsForClient(bool disable)
{
    if (global_shortcuts_disabled_for_client == disable)
        return;
    if (!global_shortcuts_disabled) {
        if (disable)
            pending_dfc = true;
        KGlobalSettings::self()->emitChange(KGlobalSettings::BlockShortcuts, disable);
        // KWin will get the kipc message too
    }
}

void Workspace::disableGlobalShortcuts(bool disable)
{
    KGlobalSettings::self()->emitChange(KGlobalSettings::BlockShortcuts, disable);
    // KWin will get the kipc message too
}

void Workspace::slotBlockShortcuts(int data)
{
    if (pending_dfc && data) {
        global_shortcuts_disabled_for_client = true;
        pending_dfc = false;
    } else {
        global_shortcuts_disabled = data;
        global_shortcuts_disabled_for_client = false;
    }
    // Update also Alt+LMB actions etc.
    for (ClientList::ConstIterator it = clients.constBegin();
            it != clients.constEnd();
            ++it)
        (*it)->updateMouseGrab();
}

// Optimized version of QCursor::pos() that tries to avoid X roundtrips
// by updating the value only when the X timestamp changes.
static QPoint last_cursor_pos;
static int last_buttons = 0;
static Time last_cursor_timestamp = CurrentTime;
static QTimer* last_cursor_timer;

QPoint Workspace::cursorPos() const
{
    if (last_cursor_timestamp == CurrentTime ||
            last_cursor_timestamp != QX11Info::appTime()) {
        last_cursor_timestamp = QX11Info::appTime();
        Window root;
        Window child;
        int root_x, root_y, win_x, win_y;
        uint state;
        XQueryPointer(display(), rootWindow(), &root, &child,
                      &root_x, &root_y, &win_x, &win_y, &state);
        last_cursor_pos = QPoint(root_x, root_y);
        last_buttons = state;
        if (last_cursor_timer == NULL) {
            Workspace* ws = const_cast<Workspace*>(this);
            last_cursor_timer = new QTimer(ws);
            last_cursor_timer->setSingleShot(true);
            connect(last_cursor_timer, SIGNAL(timeout()), ws, SLOT(resetCursorPosTime()));
        }
        last_cursor_timer->start(0);
    }
    return last_cursor_pos;
}

/**
 * Because of QTimer's and the impossibility to get events for all mouse
 * movements (at least I haven't figured out how) the position needs
 * to be also refetched after each return to the event loop.
 */
void Workspace::resetCursorPosTime()
{
    last_cursor_timestamp = CurrentTime;
}

void Workspace::checkCursorPos()
{
    QPoint last = last_cursor_pos;
    int lastb = last_buttons;
    cursorPos(); // Update if needed
    if (last != last_cursor_pos || lastb != last_buttons) {
        emit mouseChanged(last_cursor_pos, last,
            x11ToQtMouseButtons(last_buttons), x11ToQtMouseButtons(lastb),
            x11ToQtKeyboardModifiers(last_buttons), x11ToQtKeyboardModifiers(lastb));
    }
}


Outline* Workspace::outline()
{
    return m_outline;
}

#ifdef KWIN_BUILD_SCREENEDGES
ScreenEdge* Workspace::screenEdge()
{
    return &m_screenEdge;
}
#endif

bool Workspace::hasTabBox() const
{
#ifdef KWIN_BUILD_TABBOX
    return (tab_box != NULL);
#else
    return false;
#endif
}

#ifdef KWIN_BUILD_TABBOX
TabBox::TabBox* Workspace::tabBox() const
{
    return tab_box;
}
#endif

#ifdef KWIN_BUILD_TILING
Tiling* Workspace::tiling()
{
    return m_tiling;
}
#endif

/*
 * Called from D-BUS
 */
void Workspace::toggleTiling()
{
#ifdef KWIN_BUILD_TILING
    if (m_tiling) {
        m_tiling->slotToggleTiling();
    }
#endif
}

/*
 * Called from D-BUS
 */
void Workspace::nextTileLayout()
{
#ifdef KWIN_BUILD_TILING
    if (m_tiling) {
        m_tiling->slotNextTileLayout();
    }
#endif
}

/*
 * Called from D-BUS
 */
void Workspace::previousTileLayout()
{
#ifdef KWIN_BUILD_TILING
    if (m_tiling) {
        m_tiling->slotPreviousTileLayout();
    }
#endif
}

void Workspace::dumpTiles() const {
#ifdef KWIN_BUILD_TILING
    if (m_tiling) {
        m_tiling->dumpTiles();
    }
#endif
}

} // namespace

#include "workspace.moc"