qquickoverlay.cpp

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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickcontrol_p_p.h"
#include "qquickoverlay_p.h"
#include "qquickoverlay_p_p.h"
#include "qquickpopupitem_p_p.h"
#include "qquickpopup_p_p.h"
#include "qquickdrawer_p.h"
#include "qquickdrawer_p_p.h"
#include "qquickapplicationwindow_p.h"
#include <QtGui/qpainterpath.h>
#include <QtQml/qqmlinfo.h>
#include <QtQml/qqmlproperty.h>
#include <QtQml/qqmlcomponent.h>
#include <algorithm>
 
QT_BEGIN_NAMESPACE
 
 
QList<QQuickPopup *> QQuickOverlayPrivate::stackingOrderPopups() const
{
    const QList<QQuickItem *> children = paintOrderChildItems();
 
    QList<QQuickPopup *> popups;
    popups.reserve(children.size());
 
    for (auto it = children.crbegin(), end = children.crend(); it != end; ++it) {
        QQuickPopup *popup = qobject_cast<QQuickPopup *>((*it)->parent());
        if (popup)
            popups += popup;
    }
 
    return popups;
}
 
QList<QQuickPopup *> QQuickOverlayPrivate::stackingOrderDrawers() const
{
    QList<QQuickPopup *> sorted(allDrawers);
    std::sort(sorted.begin(), sorted.end(), [](const QQuickPopup *one, const QQuickPopup *another) {
        return one->z() > another->z();
    });
    return sorted;
}
 
void QQuickOverlayPrivate::itemGeometryChanged(QQuickItem *, QQuickGeometryChange, const QRectF &)
{
    updateGeometry();
}
 
void QQuickOverlayPrivate::itemRotationChanged(QQuickItem *)
{
    updateGeometry();
}
 
bool QQuickOverlayPrivate::startDrag(QEvent *event, const QPointF &pos)
{
    Q_Q(QQuickOverlay);
    if (allDrawers.isEmpty())
        return false;
 
    // don't start dragging a drawer if a modal popup overlay is blocking (QTBUG-60602)
    QQuickItem *item = q->childAt(pos.x(), pos.y());
    if (item) {
        const auto popups = stackingOrderPopups();
        for (QQuickPopup *popup : popups) {
            QQuickPopupPrivate *p = QQuickPopupPrivate::get(popup);
            if (p->dimmer == item && popup->isVisible() && popup->isModal())
                return false;
        }
    }
 
    const QList<QQuickPopup *> drawers = stackingOrderDrawers();
    for (QQuickPopup *popup : drawers) {
        QQuickDrawer *drawer = qobject_cast<QQuickDrawer *>(popup);
        Q_ASSERT(drawer);
        QQuickDrawerPrivate *p = QQuickDrawerPrivate::get(drawer);
        if (p->startDrag(event)) {
            setMouseGrabberPopup(drawer);
            return true;
        }
    }
 
    return false;
}
 
bool QQuickOverlayPrivate::handlePress(QQuickItem *source, QEvent *event, QQuickPopup *target)
{
    if (target) {
        if (target->overlayEvent(source, event)) {
            setMouseGrabberPopup(target);
            return true;
        }
        return false;
    }
 
    switch (event->type()) {
    default: {
        if (mouseGrabberPopup)
            break;
#if QT_CONFIG(quicktemplates2_multitouch)
        Q_FALLTHROUGH();
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
#endif
        // allow non-modal popups to close themselves,
        // and non-dimming modal popups to block the event
        const auto popups = stackingOrderPopups();
        for (QQuickPopup *popup : popups) {
            if (popup->overlayEvent(source, event)) {
                setMouseGrabberPopup(popup);
                return true;
            }
        }
        break;
    }
    }
 
    event->ignore();
    return false;
}
 
bool QQuickOverlayPrivate::handleMove(QQuickItem *source, QEvent *event, QQuickPopup *target)
{
    if (target)
        return target->overlayEvent(source, event);
    return false;
}
 
bool QQuickOverlayPrivate::handleRelease(QQuickItem *source, QEvent *event, QQuickPopup *target)
{
    if (target) {
        setMouseGrabberPopup(nullptr);
        if (target->overlayEvent(source, event)) {
            setMouseGrabberPopup(nullptr);
            return true;
        }
    } else {
        const auto popups = stackingOrderPopups();
        for (QQuickPopup *popup : popups) {
            if (popup->overlayEvent(source, event))
                return true;
        }
    }
    return false;
}
 
bool QQuickOverlayPrivate::handleMouseEvent(QQuickItem *source, QMouseEvent *event, QQuickPopup *target)
{
    switch (event->type()) {
    case QEvent::MouseButtonPress:
        if (!target && startDrag(event, event->scenePosition()))
            return true;
        return handlePress(source, event, target);
    case QEvent::MouseMove:
        return handleMove(source, event, target ? target : mouseGrabberPopup.data());
    case QEvent::MouseButtonRelease:
        return handleRelease(source, event, target ? target : mouseGrabberPopup.data());
    default:
        break;
    }
    return false;
}
 
bool QQuickOverlayPrivate::handleHoverEvent(QQuickItem *source, QHoverEvent *event, QQuickPopup *target)
{
    switch (event->type()) {
    case QEvent::HoverEnter:
    case QEvent::HoverMove:
    case QEvent::HoverLeave:
        if (target)
            return target->overlayEvent(source, event);
        return false;
    default:
        Q_UNREACHABLE(); // function must only be called on hover events
        break;
    }
    return false;
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
bool QQuickOverlayPrivate::handleTouchEvent(QQuickItem *source, QTouchEvent *event, QQuickPopup *target)
{
    bool handled = false;
    switch (event->type()) {
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
        for (const QTouchEvent::TouchPoint &point : event->points()) {
            switch (point.state()) {
            case QEventPoint::Pressed:
                if (!target && startDrag(event, point.scenePosition()))
                    handled = true;
                else
                    handled |= handlePress(source, event, target);
                break;
            case QEventPoint::Updated:
                handled |= handleMove(source, event, target ? target : mouseGrabberPopup.data());
                break;
            case QEventPoint::Released:
                handled |= handleRelease(source, event, target ? target : mouseGrabberPopup.data());
                break;
            default:
                break;
            }
        }
        break;
 
    default:
        break;
    }
 
    return handled;
}
#endif
 
void QQuickOverlayPrivate::addPopup(QQuickPopup *popup)
{
    Q_Q(QQuickOverlay);
    allPopups += popup;
    if (QQuickDrawer *drawer = qobject_cast<QQuickDrawer *>(popup)) {
        allDrawers += drawer;
        q->setVisible(!allDrawers.isEmpty() || !q->childItems().isEmpty());
    }
}
 
void QQuickOverlayPrivate::removePopup(QQuickPopup *popup)
{
    Q_Q(QQuickOverlay);
    allPopups.removeOne(popup);
    if (allDrawers.removeOne(popup))
        q->setVisible(!allDrawers.isEmpty() || !q->childItems().isEmpty());
}
 
void QQuickOverlayPrivate::setMouseGrabberPopup(QQuickPopup *popup)
{
    if (popup && !popup->isVisible())
        popup = nullptr;
    mouseGrabberPopup = popup;
}
 
void QQuickOverlayPrivate::updateGeometry()
{
    Q_Q(QQuickOverlay);
    if (!window || !window->contentItem())
        return;
 
    const QSizeF size = window->contentItem()->size();
    const QPointF pos(-(size.width() - window->size().width()) / 2,
                      -(size.height() - window->size().height()) / 2);
 
    q->setSize(size);
    q->setPosition(pos);
}
 
QQuickOverlay::QQuickOverlay(QQuickItem *parent)
    : QQuickItem(*(new QQuickOverlayPrivate), parent)
{
    Q_D(QQuickOverlay);
    setZ(1000001); // DefaultWindowDecoration+1
    setAcceptedMouseButtons(Qt::AllButtons);
#if QT_CONFIG(quicktemplates2_multitouch)
    setAcceptTouchEvents(true);
#endif
    setFiltersChildMouseEvents(true);
    setVisible(false);
 
    if (parent) {
        d->updateGeometry();
        QQuickItemPrivate::get(parent)->addItemChangeListener(d, QQuickItemPrivate::Geometry);
        if (QQuickWindow *window = parent->window()) {
            window->installEventFilter(this);
            if (QQuickItem *contentItem = window->contentItem())
                QQuickItemPrivate::get(contentItem)->addItemChangeListener(d, QQuickItemPrivate::Rotation);
        }
    }
}
 
QQuickOverlay::~QQuickOverlay()
{
    Q_D(QQuickOverlay);
    if (QQuickItem *parent = parentItem()) {
        QQuickItemPrivate::get(parent)->removeItemChangeListener(d, QQuickItemPrivate::Geometry);
        if (QQuickWindow *window = parent->window()) {
            if (QQuickItem *contentItem = window->contentItem())
                QQuickItemPrivate::get(contentItem)->removeItemChangeListener(d, QQuickItemPrivate::Rotation);
        }
    }
}
 
QQmlComponent *QQuickOverlay::modal() const
{
    Q_D(const QQuickOverlay);
    return d->modal;
}
 
void QQuickOverlay::setModal(QQmlComponent *modal)
{
    Q_D(QQuickOverlay);
    if (d->modal == modal)
        return;
 
    d->modal = modal;
    emit modalChanged();
}
 
QQmlComponent *QQuickOverlay::modeless() const
{
    Q_D(const QQuickOverlay);
    return d->modeless;
}
 
void QQuickOverlay::setModeless(QQmlComponent *modeless)
{
    Q_D(QQuickOverlay);
    if (d->modeless == modeless)
        return;
 
    d->modeless = modeless;
    emit modelessChanged();
}
 
QQuickOverlay *QQuickOverlay::overlay(QQuickWindow *window)
{
    if (!window)
        return nullptr;
 
    const char *name = "_q_QQuickOverlay";
    QQuickOverlay *overlay = window->property(name).value<QQuickOverlay *>();
    if (!overlay) {
        QQuickItem *content = window->contentItem();
        // Do not re-create the overlay if the window is being destroyed
        // and thus, its content item no longer has a window associated.
        if (content && content->window()) {
            overlay = new QQuickOverlay(window->contentItem());
            window->setProperty(name, QVariant::fromValue(overlay));
        }
    }
    return overlay;
}
 
QQuickOverlayAttached *QQuickOverlay::qmlAttachedProperties(QObject *object)
{
    return new QQuickOverlayAttached(object);
}
 
void QQuickOverlay::itemChange(ItemChange change, const ItemChangeData &data)
{
    Q_D(QQuickOverlay);
    QQuickItem::itemChange(change, data);
 
    if (change == ItemChildAddedChange || change == ItemChildRemovedChange) {
        setVisible(!d->allDrawers.isEmpty() || !childItems().isEmpty());
        if (data.item->parent() == d->mouseGrabberPopup)
            d->setMouseGrabberPopup(nullptr);
    }
}
 
void QQuickOverlay::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickOverlay);
    QQuickItem::geometryChange(newGeometry, oldGeometry);
    for (QQuickPopup *popup : std::as_const(d->allPopups))
        QQuickPopupPrivate::get(popup)->resizeDimmer();
}
 
void QQuickOverlay::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickOverlay);
    d->handleMouseEvent(this, event);
}
 
void QQuickOverlay::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickOverlay);
    d->handleMouseEvent(this, event);
}
 
void QQuickOverlay::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickOverlay);
    d->handleMouseEvent(this, event);
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
void QQuickOverlay::touchEvent(QTouchEvent *event)
{
    Q_D(QQuickOverlay);
    d->handleTouchEvent(this, event);
}
#endif
 
#if QT_CONFIG(wheelevent)
void QQuickOverlay::wheelEvent(QWheelEvent *event)
{
    Q_D(QQuickOverlay);
    if (d->mouseGrabberPopup) {
        d->mouseGrabberPopup->overlayEvent(this, event);
        return;
    } else {
        const auto popups = d->stackingOrderPopups();
        for (QQuickPopup *popup : popups) {
            if (popup->overlayEvent(this, event))
                return;
        }
    }
    event->ignore();
}
#endif
 
bool QQuickOverlay::childMouseEventFilter(QQuickItem *item, QEvent *event)
{
    Q_D(QQuickOverlay);
    const auto popups = d->stackingOrderPopups();
    for (QQuickPopup *popup : popups) {
        QQuickPopupPrivate *p = QQuickPopupPrivate::get(popup);
 
        // Stop filtering overlay events when reaching a popup item or an item
        // that is inside the popup. Let the popup content handle its events.
        if (item == p->popupItem || p->popupItem->isAncestorOf(item))
            break;
 
        // Let the popup try closing itself when pressing or releasing over its
        // background dimming OR over another popup underneath, in case the popup
        // does not have background dimming.
        if (item == p->dimmer || !p->popupItem->isAncestorOf(item)) {
            bool handled = false;
            switch (event->type()) {
#if QT_CONFIG(quicktemplates2_multitouch)
            case QEvent::TouchBegin:
            case QEvent::TouchUpdate:
            case QEvent::TouchEnd:
                handled = d->handleTouchEvent(item, static_cast<QTouchEvent *>(event), popup);
                break;
#endif
            case QEvent::HoverEnter:
            case QEvent::HoverMove:
            case QEvent::HoverLeave:
                handled = d->handleHoverEvent(item, static_cast<QHoverEvent *>(event), popup);
                break;
 
            case QEvent::MouseButtonPress:
            case QEvent::MouseMove:
            case QEvent::MouseButtonRelease:
                handled = d->handleMouseEvent(item, static_cast<QMouseEvent *>(event), popup);
                break;
 
            default:
                break;
            }
            if (handled)
                return true;
        }
    }
    return false;
}
 
bool QQuickOverlay::eventFilter(QObject *object, QEvent *event)
{
    Q_D(QQuickOverlay);
    if (!isVisible() || object != d->window)
        return false;
 
    switch (event->type()) {
#if QT_CONFIG(quicktemplates2_multitouch)
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
        if (static_cast<QTouchEvent *>(event)->touchPointStates() & QEventPoint::Pressed)
            emit pressed();
        if (static_cast<QTouchEvent *>(event)->touchPointStates() & QEventPoint::Released)
            emit released();
 
        // allow non-modal popups to close on touch release outside
        if (!d->mouseGrabberPopup) {
            for (const QTouchEvent::TouchPoint &point : static_cast<QTouchEvent *>(event)->points()) {
                if (point.state() == QEventPoint::Released) {
                    if (d->handleRelease(d->window->contentItem(), event, nullptr))
                        break;
                }
            }
        }
 
        // setup currentEventDeliveryAgent like in QQuickDeliveryAgent::event
        QQuickDeliveryAgentPrivate::currentEventDeliveryAgent = d->deliveryAgent();
        d->deliveryAgentPrivate()->handleTouchEvent(static_cast<QTouchEvent *>(event));
        QQuickDeliveryAgentPrivate::currentEventDeliveryAgent = nullptr;
 
        // If a touch event hasn't been accepted after being delivered, there
        // were no items interested in touch events at any of the touch points.
        // Make sure to accept the touch event in order to receive the consequent
        // touch events, to be able to close non-modal popups on release outside.
        event->accept();
        // Since we eat the event, QQuickWindow::event never sees it to clean up the
        // grabber states. So we have to do so explicitly.
        if (QQuickWindow *window = parentItem() ? parentItem()->window() : nullptr) {
            QQuickWindowPrivate *d = QQuickWindowPrivate::get(window);
            d->clearGrabbers(static_cast<QPointerEvent *>(event));
        }
        return true;
#endif
 
    case QEvent::MouseButtonPress:
#if QT_CONFIG(quicktemplates2_multitouch)
        // do not emit pressed() twice when mouse events have been synthesized from touch events
        if (static_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized)
#endif
            emit pressed();
 
        // setup currentEventDeliveryAgent like in QQuickDeliveryAgent::event
        QQuickDeliveryAgentPrivate::currentEventDeliveryAgent = d->deliveryAgent();
        d->deliveryAgentPrivate()->handleMouseEvent(static_cast<QMouseEvent *>(event));
        QQuickDeliveryAgentPrivate::currentEventDeliveryAgent = nullptr;
 
        // If a mouse event hasn't been accepted after being delivered, there
        // was no item interested in mouse events at the mouse point. Make sure
        // to accept the mouse event in order to receive the consequent mouse
        // events, to be able to close non-modal popups on release outside.
        event->accept();
        return true;
 
    case QEvent::MouseButtonRelease:
#if QT_CONFIG(quicktemplates2_multitouch)
        // do not emit released() twice when mouse events have been synthesized from touch events
        if (static_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized)
#endif
            emit released();
 
        // allow non-modal popups to close on mouse release outside
        if (!d->mouseGrabberPopup)
            d->handleRelease(d->window->contentItem(), event, nullptr);
        break;
 
#if QT_CONFIG(wheelevent)
    case QEvent::Wheel: {
        // If the top item in the drawing-order is blocked by a modal popup, then
        // eat the event. There is no scenario where the top most item is blocked
        // by a popup, but an item further down in the drawing order is not.
        QWheelEvent *we = static_cast<QWheelEvent *>(event);
        const QVector<QQuickItem *> targetItems = d->deliveryAgentPrivate()->pointerTargets(
                                    d->window->contentItem(), we, we->point(0), false, false);
        if (targetItems.isEmpty())
            break;
 
        QQuickItem * const dimmerItem = property("_q_dimmerItem").value<QQuickItem *>();
        QQuickItem * const topItem = targetItems.first();
 
        QQuickItem *item = topItem;
        while ((item = item->parentItem())) {
            if (qobject_cast<QQuickPopupItem *>(item))
                break;
        }
 
        if (!item && dimmerItem != topItem && isAncestorOf(topItem))
            break;
 
        const auto popups = d->stackingOrderPopups();
        // Eat the event if receiver topItem is not a child of a popup before
        // the first modal popup.
        for (const auto &popup : popups) {
            const QQuickItem *popupItem = popup->popupItem();
            if (!popupItem)
                continue;
            // if current popup item matches with any popup in stack, deliver the event
            if (popupItem == item)
                break;
            // if the popup doesn't contain the item but is modal, eat the event
            if (popup->overlayEvent(topItem, we))
                return true;
        }
        break;
    }
#endif
 
    default:
        break;
    }
 
    return false;
}
 
class QQuickOverlayAttachedPrivate : public QObjectPrivate
{
public:
    Q_DECLARE_PUBLIC(QQuickOverlayAttached)
 
    void setWindow(QQuickWindow *newWindow);
 
    QQuickWindow *window = nullptr;
    QQmlComponent *modal = nullptr;
    QQmlComponent *modeless = nullptr;
};
 
void QQuickOverlayAttachedPrivate::setWindow(QQuickWindow *newWindow)
{
    Q_Q(QQuickOverlayAttached);
    if (window == newWindow)
        return;
 
    if (QQuickOverlay *oldOverlay = QQuickOverlay::overlay(window)) {
        QObject::disconnect(oldOverlay, &QQuickOverlay::pressed, q, &QQuickOverlayAttached::pressed);
        QObject::disconnect(oldOverlay, &QQuickOverlay::released, q, &QQuickOverlayAttached::released);
    }
 
    if (QQuickOverlay *newOverlay = QQuickOverlay::overlay(newWindow)) {
        QObject::connect(newOverlay, &QQuickOverlay::pressed, q, &QQuickOverlayAttached::pressed);
        QObject::connect(newOverlay, &QQuickOverlay::released, q, &QQuickOverlayAttached::released);
    }
 
    window = newWindow;
    emit q->overlayChanged();
}
 
QQuickOverlayAttached::QQuickOverlayAttached(QObject *parent)
    : QObject(*(new QQuickOverlayAttachedPrivate), parent)
{
    Q_D(QQuickOverlayAttached);
    if (QQuickItem *item = qobject_cast<QQuickItem *>(parent)) {
        d->setWindow(item->window());
        QObjectPrivate::connect(item, &QQuickItem::windowChanged, d, &QQuickOverlayAttachedPrivate::setWindow);
    } else if (QQuickPopup *popup = qobject_cast<QQuickPopup *>(parent)) {
        d->setWindow(popup->window());
        QObjectPrivate::connect(popup, &QQuickPopup::windowChanged, d, &QQuickOverlayAttachedPrivate::setWindow);
    } else {
        d->setWindow(qobject_cast<QQuickWindow *>(parent));
    }
}
 
QQuickOverlay *QQuickOverlayAttached::overlay() const
{
    Q_D(const QQuickOverlayAttached);
    return QQuickOverlay::overlay(d->window);
}
 
QQmlComponent *QQuickOverlayAttached::modal() const
{
    Q_D(const QQuickOverlayAttached);
    return d->modal;
}
 
void QQuickOverlayAttached::setModal(QQmlComponent *modal)
{
    Q_D(QQuickOverlayAttached);
    if (d->modal == modal)
        return;
 
    d->modal = modal;
    emit modalChanged();
}
 
QQmlComponent *QQuickOverlayAttached::modeless() const
{
    Q_D(const QQuickOverlayAttached);
    return d->modeless;
}
 
void QQuickOverlayAttached::setModeless(QQmlComponent *modeless)
{
    Q_D(QQuickOverlayAttached);
    if (d->modeless == modeless)
        return;
 
    d->modeless = modeless;
    emit modelessChanged();
}
 
QT_END_NAMESPACE
 
#include "moc_qquickoverlay_p.cpp"