qquickdrawer.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 "qquickdrawer_p.h"
#include "qquickdrawer_p_p.h"
#include "qquickpopupitem_p_p.h"
#include "qquickpopuppositioner_p_p.h"
 
#include <QtGui/qstylehints.h>
#include <QtGui/private/qguiapplication_p.h>
#include <QtQml/qqmlinfo.h>
#include <QtQuick/private/qquickwindow_p.h>
#include <QtQuick/private/qquickanimation_p.h>
#include <QtQuick/private/qquicktransition_p.h>
 
QT_BEGIN_NAMESPACE
 
 
class QQuickDrawerPositioner : public QQuickPopupPositioner
{
public:
    QQuickDrawerPositioner(QQuickDrawer *drawer) : QQuickPopupPositioner(drawer) { }
 
    void reposition() override;
};
 
qreal QQuickDrawerPrivate::offsetAt(const QPointF &point) const
{
    qreal offset = positionAt(point) - position;
 
    // don't jump when dragged open
    if (offset > 0 && position > 0 && !contains(point))
        offset = 0;
 
    return offset;
}
 
qreal QQuickDrawerPrivate::positionAt(const QPointF &point) const
{
    Q_Q(const QQuickDrawer);
    QQuickWindow *window = q->window();
    if (!window)
        return 0;
 
    switch (edge) {
    case Qt::TopEdge:
        return point.y() / q->height();
    case Qt::LeftEdge:
        return point.x() / q->width();
    case Qt::RightEdge:
        return (window->width() - point.x()) / q->width();
    case Qt::BottomEdge:
        return (window->height() - point.y()) / q->height();
    default:
        return 0;
    }
}
 
QQuickPopupPositioner *QQuickDrawerPrivate::getPositioner()
{
    Q_Q(QQuickDrawer);
    if (!positioner)
        positioner = new QQuickDrawerPositioner(q);
    return positioner;
}
 
void QQuickDrawerPositioner::reposition()
{
    if (m_positioning)
        return;
 
    QQuickDrawer *drawer = static_cast<QQuickDrawer*>(popup());
    QQuickWindow *window = drawer->window();
    if (!window)
        return;
 
    const qreal position = drawer->position();
    QQuickItem *popupItem = drawer->popupItem();
    switch (drawer->edge()) {
    case Qt::LeftEdge:
        popupItem->setX((position - 1.0) * popupItem->width());
        break;
    case Qt::RightEdge:
        popupItem->setX(window->width() - position * popupItem->width());
        break;
    case Qt::TopEdge:
        popupItem->setY((position - 1.0) * popupItem->height());
        break;
    case Qt::BottomEdge:
        popupItem->setY(window->height() - position * popupItem->height());
        break;
    }
 
    QQuickPopupPositioner::reposition();
}
 
void QQuickDrawerPrivate::showOverlay()
{
    // managed in setPosition()
}
 
void QQuickDrawerPrivate::hideOverlay()
{
    // managed in setPosition()
}
 
void QQuickDrawerPrivate::resizeOverlay()
{
    if (!dimmer || !window)
        return;
 
    QRectF geometry(0, 0, window->width(), window->height());
 
    if (edge == Qt::LeftEdge || edge == Qt::RightEdge) {
        geometry.setY(popupItem->y());
        geometry.setHeight(popupItem->height());
    } else {
        geometry.setX(popupItem->x());
        geometry.setWidth(popupItem->width());
    }
 
    dimmer->setPosition(geometry.topLeft());
    dimmer->setSize(geometry.size());
}
 
static bool isWithinDragMargin(const QQuickDrawer *drawer, const QPointF &pos)
{
    switch (drawer->edge()) {
    case Qt::LeftEdge:
        return pos.x() <= drawer->dragMargin();
    case Qt::RightEdge:
        return pos.x() >= drawer->window()->width() - drawer->dragMargin();
    case Qt::TopEdge:
        return pos.y() <= drawer->dragMargin();
    case Qt::BottomEdge:
        return pos.y() >= drawer->window()->height() - drawer->dragMargin();
    default:
        Q_UNREACHABLE();
        break;
    }
    return false;
}
 
bool QQuickDrawerPrivate::startDrag(QEvent *event)
{
    Q_Q(QQuickDrawer);
    delayedEnterTransition = false;
    if (!window || !interactive || dragMargin < 0.0 || qFuzzyIsNull(dragMargin))
        return false;
 
    switch (event->type()) {
    case QEvent::MouseButtonPress:
        if (QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event); isWithinDragMargin(q, mouseEvent->scenePosition())) {
            // watch future events and grab the mouse once it has moved
            // sufficiently fast or far (in grabMouse).
            delayedEnterTransition = true;
            mouseEvent->addPassiveGrabber(mouseEvent->point(0), popupItem);
            handleMouseEvent(window->contentItem(), mouseEvent);
            return false;
        }
        break;
 
#if QT_CONFIG(quicktemplates2_multitouch)
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate: {
        auto *touchEvent = static_cast<QTouchEvent *>(event);
        for (const QTouchEvent::TouchPoint &point : touchEvent->points()) {
            if (point.state() == QEventPoint::Pressed && isWithinDragMargin(q, point.scenePosition())) {
                delayedEnterTransition = true;
                touchEvent->addPassiveGrabber(point, popupItem);
                handleTouchEvent(window->contentItem(), touchEvent);
                return false;
            }
        }
        break;
    }
#endif
 
    default:
        break;
    }
 
    return false;
}
 
static inline bool keepGrab(QQuickItem *item)
{
    return item->keepMouseGrab() || item->keepTouchGrab();
}
 
bool QQuickDrawerPrivate::grabMouse(QQuickItem *item, QMouseEvent *event)
{
    Q_Q(QQuickDrawer);
    handleMouseEvent(item, event);
 
    if (!window || !interactive || keepGrab(popupItem) || keepGrab(item))
        return false;
 
    const QPointF movePoint = event->scenePosition();
 
    // Flickable uses a hard-coded threshold of 15 for flicking, and
    // QStyleHints::startDragDistance for dragging. Drawer uses a bit
    // larger threshold to avoid being too eager to steal touch (QTBUG-50045)
    const int threshold = qMax(20, QGuiApplication::styleHints()->startDragDistance() + 5);
    bool overThreshold = false;
    if (position > 0 || dragMargin > 0) {
        const bool xOverThreshold = QQuickWindowPrivate::dragOverThreshold(movePoint.x() - pressPoint.x(), Qt::XAxis, event, threshold);
        const bool yOverThreshold = QQuickWindowPrivate::dragOverThreshold(movePoint.y() - pressPoint.y(), Qt::YAxis, event, threshold);
        if (edge == Qt::LeftEdge || edge == Qt::RightEdge)
            overThreshold = xOverThreshold && !yOverThreshold;
        else
            overThreshold = yOverThreshold && !xOverThreshold;
    }
 
    // Don't be too eager to steal presses outside the drawer (QTBUG-53929)
    if (overThreshold && qFuzzyCompare(position, qreal(1.0)) && !contains(movePoint)) {
        if (edge == Qt::LeftEdge || edge == Qt::RightEdge)
            overThreshold = qAbs(movePoint.x() - q->width()) < dragMargin;
        else
            overThreshold = qAbs(movePoint.y() - q->height()) < dragMargin;
    }
 
    if (overThreshold) {
        if (delayedEnterTransition) {
            prepareEnterTransition();
            reposition();
            delayedEnterTransition = false;
        }
 
        popupItem->grabMouse();
        popupItem->setKeepMouseGrab(true);
        offset = offsetAt(movePoint);
    }
 
    return overThreshold;
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
bool QQuickDrawerPrivate::grabTouch(QQuickItem *item, QTouchEvent *event)
{
    Q_Q(QQuickDrawer);
    bool handled = handleTouchEvent(item, event);
 
    if (!window || !interactive || keepGrab(popupItem) || keepGrab(item) || !event->touchPointStates().testFlag(QEventPoint::Updated))
        return handled;
 
    bool overThreshold = false;
    for (const QTouchEvent::TouchPoint &point : event->points()) {
        if (!acceptTouch(point) || point.state() != QEventPoint::Updated)
            continue;
 
        const QPointF movePoint = point.scenePosition();
 
        // Flickable uses a hard-coded threshold of 15 for flicking, and
        // QStyleHints::startDragDistance for dragging. Drawer uses a bit
        // larger threshold to avoid being too eager to steal touch (QTBUG-50045)
        const int threshold = qMax(20, QGuiApplication::styleHints()->startDragDistance() + 5);
        if (position > 0 || dragMargin > 0) {
            const bool xOverThreshold = QQuickWindowPrivate::dragOverThreshold(movePoint.x() - pressPoint.x(), Qt::XAxis, &point, threshold);
            const bool yOverThreshold = QQuickWindowPrivate::dragOverThreshold(movePoint.y() - pressPoint.y(), Qt::YAxis, &point, threshold);
            if (edge == Qt::LeftEdge || edge == Qt::RightEdge)
                overThreshold = xOverThreshold && !yOverThreshold;
            else
                overThreshold = yOverThreshold && !xOverThreshold;
        }
 
        // Don't be too eager to steal presses outside the drawer (QTBUG-53929)
        if (overThreshold && qFuzzyCompare(position, qreal(1.0)) && !contains(movePoint)) {
            if (edge == Qt::LeftEdge || edge == Qt::RightEdge)
                overThreshold = qAbs(movePoint.x() - q->width()) < dragMargin;
            else
                overThreshold = qAbs(movePoint.y() - q->height()) < dragMargin;
        }
 
        if (overThreshold) {
            if (delayedEnterTransition) {
                prepareEnterTransition();
                reposition();
                delayedEnterTransition = false;
            }
            event->setExclusiveGrabber(point, popupItem);
            popupItem->setKeepTouchGrab(true);
            offset = offsetAt(movePoint);
        }
    }
 
    return overThreshold;
}
#endif
 
static const qreal openCloseVelocityThreshold = 300;
 
// Overrides QQuickPopupPrivate::blockInput, which is called by
// QQuickPopupPrivate::handlePress/Move/Release, which we call in our own
// handlePress/Move/Release overrides.
// This implementation conflates two things: should the event going to the item get
// modally blocked by us? Or should we accept the event and become the grabber?
// Those are two fundamentally different questions for the drawer as a (usually)
// interactive control.
bool QQuickDrawerPrivate::blockInput(QQuickItem *item, const QPointF &point) const
{
    Q_Q(const QQuickDrawer);
 
    // We want all events, if mouse/touch is already grabbed.
    if (popupItem->keepMouseGrab() || popupItem->keepTouchGrab())
        return true;
 
    // Don't block input to drawer's children/content.
    if (popupItem->isAncestorOf(item))
        return false;
 
    // Don't block outside a drawer's background dimming
    if (dimmer && !dimmer->contains(dimmer->mapFromScene(point)))
        return false;
 
    // Accept all events within drag area.
    if (isWithinDragMargin(q, point))
        return true;
 
    // Accept all other events if drawer is modal.
    return modal;
}
 
bool QQuickDrawerPrivate::handlePress(QQuickItem *item, const QPointF &point, ulong timestamp)
{
    offset = 0;
    velocityCalculator.startMeasuring(point, timestamp);
 
    if (!QQuickPopupPrivate::handlePress(item, point, timestamp))
        return interactive && popupItem == item;
 
    return true;
}
 
bool QQuickDrawerPrivate::handleMove(QQuickItem *item, const QPointF &point, ulong timestamp)
{
    Q_Q(QQuickDrawer);
    if (!QQuickPopupPrivate::handleMove(item, point, timestamp))
        return false;
 
    // limit/reset the offset to the edge of the drawer when pushed from the outside
    if (qFuzzyCompare(position, qreal(1.0)) && !contains(point))
        offset = 0;
 
    bool isGrabbed = popupItem->keepMouseGrab() || popupItem->keepTouchGrab();
    if (isGrabbed)
        q->setPosition(positionAt(point) - offset);
 
    return isGrabbed;
}
 
bool QQuickDrawerPrivate::handleRelease(QQuickItem *item, const QPointF &point, ulong timestamp)
{
    auto cleanup = qScopeGuard([this] {
        popupItem->setKeepMouseGrab(false);
        popupItem->setKeepTouchGrab(false);
        pressPoint = QPointF();
        touchId = -1;
    });
    if (pressPoint.isNull())
        return false;
    if (!popupItem->keepMouseGrab() && !popupItem->keepTouchGrab()) {
        velocityCalculator.reset();
        return QQuickPopupPrivate::handleRelease(item, point, timestamp);
    }
 
    velocityCalculator.stopMeasuring(point, timestamp);
 
    qreal velocity = 0;
    if (edge == Qt::LeftEdge || edge == Qt::RightEdge)
        velocity = velocityCalculator.velocity().x();
    else
        velocity = velocityCalculator.velocity().y();
 
    // the velocity is calculated so that swipes from left to right
    // and top to bottom have positive velocity, and swipes from right
    // to left and bottom to top have negative velocity.
    //
    // - top/left edge: positive velocity opens, negative velocity closes
    // - bottom/right edge: negative velocity opens, positive velocity closes
    //
    // => invert the velocity for bottom and right edges, for the threshold comparison below
    if (edge == Qt::RightEdge || edge == Qt::BottomEdge)
        velocity = -velocity;
 
    if (position > 0.7 || velocity > openCloseVelocityThreshold) {
        transitionManager.transitionEnter();
    } else if (position < 0.3 || velocity < -openCloseVelocityThreshold) {
        transitionManager.transitionExit();
    } else {
        switch (edge) {
        case Qt::LeftEdge:
            if (point.x() - pressPoint.x() > 0)
                transitionManager.transitionEnter();
            else
                transitionManager.transitionExit();
            break;
        case Qt::RightEdge:
            if (point.x() - pressPoint.x() < 0)
                transitionManager.transitionEnter();
            else
                transitionManager.transitionExit();
            break;
        case Qt::TopEdge:
            if (point.y() - pressPoint.y() > 0)
                transitionManager.transitionEnter();
            else
                transitionManager.transitionExit();
            break;
        case Qt::BottomEdge:
            if (point.y() - pressPoint.y() < 0)
                transitionManager.transitionEnter();
            else
                transitionManager.transitionExit();
            break;
        }
    }
 
    // the cleanup() lambda will run before return
    return popupItem->keepMouseGrab() || popupItem->keepTouchGrab();
}
 
void QQuickDrawerPrivate::handleUngrab()
{
    QQuickPopupPrivate::handleUngrab();
 
    velocityCalculator.reset();
}
 
static QList<QQuickStateAction> prepareTransition(QQuickDrawer *drawer, QQuickTransition *transition, qreal to)
{
    QList<QQuickStateAction> actions;
    if (!transition || !QQuickPopupPrivate::get(drawer)->window || !transition->enabled())
        return actions;
 
    qmlExecuteDeferred(transition);
 
    QQmlProperty defaultTarget(drawer, QLatin1String("position"));
    QQmlListProperty<QQuickAbstractAnimation> animations = transition->animations();
    int count = animations.count(&animations);
    for (int i = 0; i < count; ++i) {
        QQuickAbstractAnimation *anim = animations.at(&animations, i);
        anim->setDefaultTarget(defaultTarget);
    }
 
    actions << QQuickStateAction(drawer, QLatin1String("position"), to);
    return actions;
}
 
bool QQuickDrawerPrivate::prepareEnterTransition()
{
    Q_Q(QQuickDrawer);
    enterActions = prepareTransition(q, enter, 1.0);
    return QQuickPopupPrivate::prepareEnterTransition();
}
 
bool QQuickDrawerPrivate::prepareExitTransition()
{
    Q_Q(QQuickDrawer);
    exitActions = prepareTransition(q, exit, 0.0);
    return QQuickPopupPrivate::prepareExitTransition();
}
 
bool QQuickDrawerPrivate::setEdge(Qt::Edge e)
{
    Q_Q(QQuickDrawer);
    switch (e) {
    case Qt::LeftEdge:
    case Qt::RightEdge:
        allowVerticalMove = true;
        allowVerticalResize = true;
        allowHorizontalMove = false;
        allowHorizontalResize = false;
        break;
    case Qt::TopEdge:
    case Qt::BottomEdge:
        allowVerticalMove = false;
        allowVerticalResize = false;
        allowHorizontalMove = true;
        allowHorizontalResize = true;
        break;
    default:
        qmlWarning(q) << "invalid edge value - valid values are: "
            << "Qt.TopEdge, Qt.LeftEdge, Qt.RightEdge, Qt.BottomEdge";
        return false;
    }
 
    edge = e;
    return true;
}
 
QQuickDrawer::QQuickDrawer(QObject *parent)
    : QQuickPopup(*(new QQuickDrawerPrivate), parent)
{
    Q_D(QQuickDrawer);
    d->dragMargin = QGuiApplication::styleHints()->startDragDistance();
    d->setEdge(Qt::LeftEdge);
 
    setFocus(true);
    setModal(true);
    setFiltersChildMouseEvents(true);
    setClosePolicy(CloseOnEscape | CloseOnReleaseOutside);
}
 
Qt::Edge QQuickDrawer::edge() const
{
    Q_D(const QQuickDrawer);
    return d->edge;
}
 
void QQuickDrawer::setEdge(Qt::Edge edge)
{
    Q_D(QQuickDrawer);
    if (d->edge == edge)
        return;
 
    if (!d->setEdge(edge))
        return;
 
    if (isComponentComplete())
        d->reposition();
    emit edgeChanged();
}
 
qreal QQuickDrawer::position() const
{
    Q_D(const QQuickDrawer);
    return d->position;
}
 
void QQuickDrawer::setPosition(qreal position)
{
    Q_D(QQuickDrawer);
    position = qBound<qreal>(0.0, position, 1.0);
    if (qFuzzyCompare(d->position, position))
        return;
 
    d->position = position;
    if (isComponentComplete())
        d->reposition();
    if (d->dimmer)
        d->dimmer->setOpacity(position);
    emit positionChanged();
}
 
qreal QQuickDrawer::dragMargin() const
{
    Q_D(const QQuickDrawer);
    return d->dragMargin;
}
 
void QQuickDrawer::setDragMargin(qreal margin)
{
    Q_D(QQuickDrawer);
    if (qFuzzyCompare(d->dragMargin, margin))
        return;
 
    d->dragMargin = margin;
    emit dragMarginChanged();
}
 
void QQuickDrawer::resetDragMargin()
{
    setDragMargin(QGuiApplication::styleHints()->startDragDistance());
}
 
bool QQuickDrawer::isInteractive() const
{
    Q_D(const QQuickDrawer);
    return d->interactive;
}
 
void QQuickDrawer::setInteractive(bool interactive)
{
    Q_D(QQuickDrawer);
    if (d->interactive == interactive)
        return;
 
    setFiltersChildMouseEvents(interactive);
    d->interactive = interactive;
    emit interactiveChanged();
}
 
bool QQuickDrawer::childMouseEventFilter(QQuickItem *child, QEvent *event)
{
    Q_D(QQuickDrawer);
    switch (event->type()) {
#if QT_CONFIG(quicktemplates2_multitouch)
    case QEvent::TouchUpdate:
        return d->grabTouch(child, static_cast<QTouchEvent *>(event));
    case QEvent::TouchBegin:
    case QEvent::TouchEnd:
        return d->handleTouchEvent(child, static_cast<QTouchEvent *>(event));
#endif
    case QEvent::MouseMove:
        return d->grabMouse(child, static_cast<QMouseEvent *>(event));
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
        return d->handleMouseEvent(child, static_cast<QMouseEvent *>(event));
    default:
        break;
    }
    return false;
}
 
void QQuickDrawer::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickDrawer);
    d->grabMouse(d->popupItem, event);
}
 
bool QQuickDrawer::overlayEvent(QQuickItem *item, QEvent *event)
{
    Q_D(QQuickDrawer);
    switch (event->type()) {
#if QT_CONFIG(quicktemplates2_multitouch)
    case QEvent::TouchUpdate:
        return d->grabTouch(item, static_cast<QTouchEvent *>(event));
#endif
    case QEvent::MouseMove:
        return d->grabMouse(item, static_cast<QMouseEvent *>(event));
    default:
        break;
    }
    return QQuickPopup::overlayEvent(item, event);
}
 
#if QT_CONFIG(quicktemplates2_multitouch)
void QQuickDrawer::touchEvent(QTouchEvent *event)
{
    Q_D(QQuickDrawer);
    d->grabTouch(d->popupItem, event);
}
#endif
 
void QQuickDrawer::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickDrawer);
    QQuickPopup::geometryChange(newGeometry, oldGeometry);
    d->resizeOverlay();
}
 
QT_END_NAMESPACE
 
#include "moc_qquickdrawer_p.cpp"