File indexing completed on 2024-05-12 05:32:14

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2009 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "tabboxhandler.h"
 
 #include <config-kwin.h>
 
 // own
 #include "clientmodel.h"
 #include "scripting/scripting.h"
 #include "switcheritem.h"
 #include "tabbox_logging.h"
 #include "window.h"
 // Qt
 #include <QKeyEvent>
 #include <QQmlComponent>
 #include <QQmlContext>
 #include <QQmlEngine>
 #include <QQuickItem>
 #include <QQuickWindow>
 #include <QStandardPaths>
 #include <QTimer>
 #include <qpa/qwindowsysteminterface.h>
 // KDE
 #include <KLocalizedString>
 #include <KPackage/Package>
 #include <KPackage/PackageLoader>
 #include <KProcess>
 
 namespace KWin
 {
 namespace TabBox
 {
 
 class TabBoxHandlerPrivate
 {
 public:
     TabBoxHandlerPrivate(TabBoxHandler *q);
 
     ~TabBoxHandlerPrivate();
 
     /**
      * Updates the current highlight window state
      */
     void updateHighlightWindows();
     /**
      * Ends window highlighting
      */
     void endHighlightWindows(bool abort = false);
 
     void show();
     QQuickWindow *window() const;
     SwitcherItem *switcherItem() const;
 
     ClientModel *clientModel() const;
 
     bool isHighlightWindows() const;
 
     TabBoxHandler *q; // public pointer
     // members
     TabBoxConfig config;
     std::unique_ptr<QQmlContext> m_qmlContext;
     std::unique_ptr<QQmlComponent> m_qmlComponent;
     QObject *m_mainItem;
     QMap<QString, QObject *> m_clientTabBoxes;
     ClientModel *m_clientModel;
     QModelIndex index;
     /**
      * Indicates if the tabbox is shown.
      */
     bool isShown;
     Window *lastRaisedClient, *lastRaisedClientSucc;
     int wheelAngleDelta = 0;
 
 private:
     QObject *createSwitcherItem();
 };
 
 TabBoxHandlerPrivate::TabBoxHandlerPrivate(TabBoxHandler *q)
     : m_qmlContext()
     , m_qmlComponent(nullptr)
     , m_mainItem(nullptr)
 {
     this->q = q;
     isShown = false;
     lastRaisedClient = nullptr;
     lastRaisedClientSucc = nullptr;
     config = TabBoxConfig();
     m_clientModel = new ClientModel(q);
 }
 
 TabBoxHandlerPrivate::~TabBoxHandlerPrivate()
 {
     qDeleteAll(m_clientTabBoxes);
 }
 
 QQuickWindow *TabBoxHandlerPrivate::window() const
 {
     if (!m_mainItem) {
         return nullptr;
     }
     if (QQuickWindow *w = qobject_cast<QQuickWindow *>(m_mainItem)) {
         return w;
     }
     return m_mainItem->findChild<QQuickWindow *>();
 }
 
 #ifndef KWIN_UNIT_TEST
 SwitcherItem *TabBoxHandlerPrivate::switcherItem() const
 {
     if (!m_mainItem) {
         return nullptr;
     }
     if (SwitcherItem *i = qobject_cast<SwitcherItem *>(m_mainItem)) {
         return i;
     } else if (QQuickWindow *w = qobject_cast<QQuickWindow *>(m_mainItem)) {
         return w->contentItem()->findChild<SwitcherItem *>();
     }
     return m_mainItem->findChild<SwitcherItem *>();
 }
 #endif
 
 ClientModel *TabBoxHandlerPrivate::clientModel() const
 {
     return m_clientModel;
 }
 
 bool TabBoxHandlerPrivate::isHighlightWindows() const
 {
     const QQuickWindow *w = window();
     if (w && w->visibility() == QWindow::FullScreen) {
         return false;
     }
     return config.isHighlightWindows();
 }
 
 void TabBoxHandlerPrivate::updateHighlightWindows()
 {
     if (!isShown) {
         return;
     }
 
     Window *currentClient = q->client(index);
     QWindow *w = window();
 
     if (q->isKWinCompositing()) {
         if (lastRaisedClient) {
             q->elevateClient(lastRaisedClient, w, false);
         }
         lastRaisedClient = currentClient;
         // don't elevate desktop
         const auto desktop = q->desktopClient();
         if (currentClient && (!desktop || currentClient->internalId() != desktop->internalId())) {
             q->elevateClient(currentClient, w, true);
         }
     } else {
         if (lastRaisedClient) {
             q->shadeClient(lastRaisedClient, true);
             if (lastRaisedClientSucc) {
                 q->restack(lastRaisedClient, lastRaisedClientSucc);
             }
             // TODO lastRaisedClient->setMinimized( lastRaisedClientWasMinimized );
         }
 
         lastRaisedClient = currentClient;
         if (lastRaisedClient) {
             q->shadeClient(lastRaisedClient, false);
             // TODO if ( (lastRaisedClientWasMinimized = lastRaisedClient->isMinimized()) )
             //         lastRaisedClient->setMinimized( false );
             QList<Window *> order = q->stackingOrder();
             int succIdx = order.count() + 1;
             for (int i = 0; i < order.count(); ++i) {
                 if (order.at(i) == lastRaisedClient) {
                     succIdx = i + 1;
                     break;
                 }
             }
             lastRaisedClientSucc = (succIdx < order.count()) ? order.at(succIdx) : nullptr;
             q->raiseClient(lastRaisedClient);
         }
     }
 
     if (config.isShowTabBox() && w) {
         q->highlightWindows(currentClient, w);
     } else {
         q->highlightWindows(currentClient);
     }
 }
 
 void TabBoxHandlerPrivate::endHighlightWindows(bool abort)
 {
     Window *currentClient = q->client(index);
     if (isHighlightWindows() && q->isKWinCompositing()) {
         const auto stackingOrder = q->stackingOrder();
         for (Window *window : stackingOrder) {
             if (window != currentClient) { // to not mess up with wanted ShadeActive/ShadeHover state
                 q->shadeClient(window, true);
             }
         }
     }
     QWindow *w = window();
     if (currentClient) {
         q->elevateClient(currentClient, w, false);
     }
     if (abort && lastRaisedClient && lastRaisedClientSucc) {
         q->restack(lastRaisedClient, lastRaisedClientSucc);
     }
     lastRaisedClient = nullptr;
     lastRaisedClientSucc = nullptr;
     // highlight windows
     q->highlightWindows();
 }
 
 #ifndef KWIN_UNIT_TEST
 QObject *TabBoxHandlerPrivate::createSwitcherItem()
 {
     // first try look'n'feel package
     QString file = QStandardPaths::locate(
         QStandardPaths::GenericDataLocation,
         QStringLiteral("plasma/look-and-feel/%1/contents/windowswitcher/WindowSwitcher.qml").arg(config.layoutName()));
     if (file.isNull()) {
         const QString type = QStringLiteral("KWin/WindowSwitcher");
 
         KPackage::Package pkg = KPackage::PackageLoader::self()->loadPackage(type, config.layoutName());
 
         if (!pkg.isValid()) {
             // load default
             qCWarning(KWIN_TABBOX) << "Could not load window switcher package" << config.layoutName() << ". Falling back to default";
             pkg = KPackage::PackageLoader::self()->loadPackage(type, TabBoxConfig::defaultLayoutName());
         }
 
         file = pkg.filePath("mainscript");
     }
     if (file.isNull()) {
         qCDebug(KWIN_TABBOX) << "Could not find QML file for window switcher";
         return nullptr;
     }
     m_qmlComponent->loadUrl(QUrl::fromLocalFile(file));
     if (m_qmlComponent->isError()) {
         qCWarning(KWIN_TABBOX) << "Component failed to load: " << m_qmlComponent->errors();
         QStringList args;
         args << QStringLiteral("--passivepopup") << i18n("The Window Switcher installation is broken, resources are missing.\n"
                                                          "Contact your distribution about this.")
              << QStringLiteral("20");
         KProcess::startDetached(QStringLiteral("kdialog"), args);
         m_qmlComponent.reset(nullptr);
     } else {
         QObject *object = m_qmlComponent->create(m_qmlContext.get());
         m_clientTabBoxes.insert(config.layoutName(), object);
         return object;
     }
     return nullptr;
 }
 #endif
 
 void TabBoxHandlerPrivate::show()
 {
 #ifndef KWIN_UNIT_TEST
     if (!m_qmlContext) {
         qmlRegisterType<SwitcherItem>("org.kde.kwin", 3, 0, "TabBoxSwitcher");
         m_qmlContext = std::make_unique<QQmlContext>(Scripting::self()->qmlEngine());
     }
     if (!m_qmlComponent) {
         m_qmlComponent = std::make_unique<QQmlComponent>(Scripting::self()->qmlEngine());
     }
     auto findMainItem = [this](const QMap<QString, QObject *> &tabBoxes) -> QObject * {
         auto it = tabBoxes.constFind(config.layoutName());
         if (it != tabBoxes.constEnd()) {
             return it.value();
         }
         return nullptr;
     };
     m_mainItem = nullptr;
     m_mainItem = findMainItem(m_clientTabBoxes);
     if (!m_mainItem) {
         m_mainItem = createSwitcherItem();
         if (!m_mainItem) {
             return;
         }
     }
     if (SwitcherItem *item = switcherItem()) {
         // In case the model isn't yet set (see below), index will be reset and therefore we
         // need to save the current index row (https://bugs.kde.org/show_bug.cgi?id=333511).
         int indexRow = index.row();
         if (!item->model()) {
             item->setModel(clientModel());
         }
         item->setAllDesktops(config.clientDesktopMode() == TabBoxConfig::AllDesktopsClients);
         item->setCurrentIndex(indexRow);
         item->setNoModifierGrab(q->noModifierGrab());
         Q_EMIT item->aboutToShow();
 
         // When SwitcherItem gets hidden, destroy also the window and main item
         QObject::connect(item, &SwitcherItem::visibleChanged, q, [this, item]() {
             if (!item->isVisible()) {
                 if (QQuickWindow *w = window()) {
                     w->hide();
                     w->destroy();
                 }
                 m_mainItem = nullptr;
             }
         });
 
         // everything is prepared, so let's make the whole thing visible
         item->setVisible(true);
     }
     if (QWindow *w = window()) {
         wheelAngleDelta = 0;
         w->installEventFilter(q);
         // pretend to activate the window to enable accessibility notifications
 #if QT_VERSION < QT_VERSION_CHECK(6, 7, 0)
         QWindowSystemInterface::handleWindowActivated(w, Qt::TabFocusReason);
 #else
         QWindowSystemInterface::handleFocusWindowChanged(w, Qt::TabFocusReason);
 #endif
     }
 #endif
 }
 
 /***********************************************
  * TabBoxHandler
  ***********************************************/
 
 TabBoxHandler::TabBoxHandler(QObject *parent)
     : QObject(parent)
 {
     KWin::TabBox::tabBox = this;
     d = new TabBoxHandlerPrivate(this);
 }
 
 TabBoxHandler::~TabBoxHandler()
 {
     delete d;
 }
 
 const KWin::TabBox::TabBoxConfig &TabBoxHandler::config() const
 {
     return d->config;
 }
 
 void TabBoxHandler::setConfig(const TabBoxConfig &config)
 {
     d->config = config;
     Q_EMIT configChanged();
 }
 
 void TabBoxHandler::show()
 {
     d->isShown = true;
     d->lastRaisedClient = nullptr;
     d->lastRaisedClientSucc = nullptr;
     if (d->config.isShowTabBox()) {
         d->show();
     }
     if (d->isHighlightWindows()) {
         // TODO this should be
         // QMetaObject::invokeMethod(this, "initHighlightWindows", Qt::QueuedConnection);
         // but we somehow need to cross > 1 event cycle (likely because of queued invocation in the effects)
         // to ensure the EffectWindow is present when updateHighlightWindows, thus elevating the window/tabbox
         QTimer::singleShot(1, this, &TabBoxHandler::initHighlightWindows);
     }
 }
 
 void TabBoxHandler::initHighlightWindows()
 {
     if (isKWinCompositing()) {
         const auto stack = stackingOrder();
         for (Window *window : stack) {
             shadeClient(window, false);
         }
     }
     d->updateHighlightWindows();
 }
 
 void TabBoxHandler::hide(bool abort)
 {
     d->isShown = false;
     if (d->isHighlightWindows()) {
         d->endHighlightWindows(abort);
     }
 #ifndef KWIN_UNIT_TEST
     if (SwitcherItem *item = d->switcherItem()) {
         Q_EMIT item->aboutToHide();
         if (item->automaticallyHide()) {
             item->setVisible(false);
         }
     }
 #endif
 }
 
 QModelIndex TabBoxHandler::nextPrev(bool forward) const
 {
     QModelIndex ret;
     QAbstractItemModel *model = d->clientModel();
     if (forward) {
         int column = d->index.column() + 1;
         int row = d->index.row();
         if (column == model->columnCount()) {
             column = 0;
             row++;
             if (row == model->rowCount()) {
                 row = 0;
             }
         }
         ret = model->index(row, column);
         if (!ret.isValid()) {
             ret = model->index(0, 0);
         }
     } else {
         int column = d->index.column() - 1;
         int row = d->index.row();
         if (column < 0) {
             column = model->columnCount() - 1;
             row--;
             if (row < 0) {
                 row = model->rowCount() - 1;
             }
         }
         ret = model->index(row, column);
         if (!ret.isValid()) {
             row = model->rowCount() - 1;
             for (int i = model->columnCount() - 1; i >= 0; i--) {
                 ret = model->index(row, i);
                 if (ret.isValid()) {
                     break;
                 }
             }
         }
     }
     if (ret.isValid()) {
         return ret;
     } else {
         return d->index;
     }
 }
 
 void TabBoxHandler::setCurrentIndex(const QModelIndex &index)
 {
     if (d->index == index) {
         return;
     }
     if (!index.isValid()) {
         return;
     }
     d->index = index;
     if (d->isHighlightWindows()) {
         d->updateHighlightWindows();
     }
     Q_EMIT selectedIndexChanged();
 }
 
 const QModelIndex &TabBoxHandler::currentIndex() const
 {
     return d->index;
 }
 
 void TabBoxHandler::grabbedKeyEvent(QKeyEvent *event) const
 {
     if (!d->m_mainItem || !d->window()) {
         return;
     }
     QCoreApplication::sendEvent(d->window(), event);
 }
 
 bool TabBoxHandler::containsPos(const QPoint &pos) const
 {
     if (!d->m_mainItem) {
         return false;
     }
     QWindow *w = d->window();
     if (w) {
         return w->geometry().contains(pos);
     }
     return false;
 }
 
 QModelIndex TabBoxHandler::index(Window *client) const
 {
     return d->clientModel()->index(client);
 }
 
 QList<Window *> TabBoxHandler::clientList() const
 {
     return d->clientModel()->clientList();
 }
 
 Window *TabBoxHandler::client(const QModelIndex &index) const
 {
     if (!index.isValid()) {
         return nullptr;
     }
     Window *c = static_cast<Window *>(
         d->clientModel()->data(index, ClientModel::ClientRole).value<void *>());
     return c;
 }
 
 void TabBoxHandler::createModel(bool partialReset)
 {
     d->clientModel()->createClientList(partialReset);
     // TODO: C++11 use lambda function
     bool lastRaised = false;
     bool lastRaisedSucc = false;
     const auto clients = stackingOrder();
     for (Window *window : clients) {
         if (window == d->lastRaisedClient) {
             lastRaised = true;
         }
         if (window == d->lastRaisedClientSucc) {
             lastRaisedSucc = true;
         }
     }
     if (d->lastRaisedClient && !lastRaised) {
         d->lastRaisedClient = nullptr;
     }
     if (d->lastRaisedClientSucc && !lastRaisedSucc) {
         d->lastRaisedClientSucc = nullptr;
     }
 }
 
 QModelIndex TabBoxHandler::first() const
 {
     return d->clientModel()->index(0, 0);
 }
 
 bool TabBoxHandler::eventFilter(QObject *watched, QEvent *e)
 {
     if (e->type() == QEvent::Wheel && watched == d->window()) {
         QWheelEvent *event = static_cast<QWheelEvent *>(e);
         // On x11 the delta for vertical scrolling might also be on X for whatever reason
         const int delta = std::abs(event->angleDelta().x()) > std::abs(event->angleDelta().y()) ? event->angleDelta().x() : event->angleDelta().y();
         d->wheelAngleDelta += delta;
         while (d->wheelAngleDelta <= -120) {
             d->wheelAngleDelta += 120;
             const QModelIndex index = nextPrev(true);
             if (index.isValid()) {
                 setCurrentIndex(index);
             }
         }
         while (d->wheelAngleDelta >= 120) {
             d->wheelAngleDelta -= 120;
             const QModelIndex index = nextPrev(false);
             if (index.isValid()) {
                 setCurrentIndex(index);
             }
         }
         return true;
     }
     // pass on
     return QObject::eventFilter(watched, e);
 }
 
 TabBoxHandler *tabBox = nullptr;
 
 } // namespace TabBox
 } // namespace KWin
 
 #include "moc_tabboxhandler.cpp"