Method eventFilter

kdevplatform/sublime/controller.cpp:319–381

We need this to catch activation of views and tool views so that we can always tell what view and tool view is active. "Active" doesn't mean focused. It means that it is focused now or was focused before and no other view/tool view wasn't focused after that."*/ implementation is based upon KParts::PartManager::eventFilter

after that."*/
//implementation is based upon KParts::PartManager::eventFilter
bool Controller::eventFilter(QObject *obj, QEvent *ev)
{
    Q_D(Controller);

    if (ev->type() != QEvent::MouseButtonPress &&
        ev->type() != QEvent::MouseButtonDblClick &&
        ev->type() != QEvent::FocusIn)
        return false;

    //not a widget? - return
    if (!obj->isWidgetType())
        return false;

    //is dialog or popup? - return
    auto *w = static_cast<QWidget*>(obj);
    if (((w->windowFlags().testFlag(Qt::Dialog)) && w->isModal()) ||
            (w->windowFlags().testFlag(Qt::Popup)) || (w->windowFlags().testFlag(Qt::Tool)))
        return false;

    //not a mouse button that should activate the widget? - return
    if (ev->type() == QEvent::MouseButtonPress || ev->type() == QEvent::MouseButtonDblClick)
    {
        auto* mev = static_cast<QMouseEvent*>(ev);
        int activationButtonMask = Qt::LeftButton | Qt::MiddleButton | Qt::RightButton;
        if ((mev->button() & activationButtonMask) == 0)
            return false;
    }

    while (w)
    {
        //not inside sublime mainwindow
        auto *mw = qobject_cast<Sublime::MainWindow*>(w->topLevelWidget());
        if (!mw || !d->controlledWindows.contains(mw))
            return false;

        Area *area = mw->area();

        ///@todo adymo: this is extra slow - optimize
        //find this widget in views
        WidgetFinder widgetFinder(w);
        area->walkViews(widgetFinder, area->rootIndex());
        if (widgetFinder.view) {
            if (widgetFinder.view != mw->activeView()) {
                setActiveView(mw, widgetFinder.view);
            }
            ///@todo adymo: shall we filter out the event?
            return false;
        }

        //find this widget in tool views
        ToolWidgetFinder toolFinder(w);
        area->walkToolViews(toolFinder, Sublime::AllPositions);
        if (toolFinder.view) {
            setActiveToolView(mw, toolFinder.view);
            ///@todo adymo: shall we filter out the event?
            return false;
        }