qaccessiblewidget.cpp

奇趣公司比较新的qt/emd版本

{
    while (child) {
        if (child == obj)
            return true;
        child = child->parent();
    }
    return false;
}


/*! \reimp */
QAccessible::Relation QAccessibleWidget::relationTo(int child,
            const QAccessibleInterface *other, int otherChild) const
{
    Relation relation = Unrelated;
    if (d->asking == this) // recursive call
        return relation;

    QObject *o = other ? other->object() : 0;
    if (!o)
        return relation;

    QWidget *focus = widget()->focusWidget();
    if (object() == focus && isAncestor(o, focus))
        relation |= FocusChild;

    QACConnectionObject *connectionObject = (QACConnectionObject*)object();
    for (int sig = 0; sig < d->primarySignals.count(); ++sig) {
        if (connectionObject->isSender(o, d->primarySignals.at(sig).toAscii())) {
            relation |= Controller;
            break;
        }
    }
    // test for passive relationships.
    // d->asking protects from endless recursion.
    d->asking = this;
    int inverse = other->relationTo(otherChild, this, child);
    d->asking = 0;

    if (inverse & Controller)
        relation |= Controlled;
    if (inverse & Label)
        relation |= Labelled;

    if(o == object()) {
        if (child && !otherChild)
            return relation | Child;
        if (!child && otherChild)
            return relation | Ancestor;
        if (!child && !otherChild)
            return relation | Self;
    }

    QObject *parent = object()->parent();
    if (o == parent)
        return relation | Child;

    if (o->parent() == parent) {
        relation |= Sibling;
        QAccessibleInterface *sibIface = QAccessible::queryAccessibleInterface(o);
        Q_ASSERT(sibIface);
        QRect wg = rect(0);
        QRect sg = sibIface->rect(0);
        if (wg.intersects(sg)) {
            QAccessibleInterface *pIface = 0;
            sibIface->navigate(Ancestor, 1, &pIface);
            if (pIface && !((sibIface->state(0) | state(0)) & Invisible)) {
                int wi = pIface->indexOfChild(this);
                int si = pIface->indexOfChild(sibIface);

                if (wi > si)
                    relation |= QAccessible::Covers;
                else
                    relation |= QAccessible::Covered;
            }
            delete pIface;
        } else {
            QPoint wc = wg.center();
            QPoint sc = sg.center();
            if (wc.x() < sc.x())
                relation |= QAccessible::Left;
            else if(wc.x() > sc.x())
                relation |= QAccessible::Right;
            if (wc.y() < sc.y())
                relation |= QAccessible::Up;
            else if (wc.y() > sc.y())
                relation |= QAccessible::Down;
        }
        delete sibIface;

        return relation;
    }

    if (isAncestor(o, object()))
        return relation | Descendent;
    if (isAncestor(object(), o))
        return relation | Ancestor;

    return relation;
}

/*! \reimp */
int QAccessibleWidget::navigate(RelationFlag relation, int entry,
                                QAccessibleInterface **target) const
{
    if (!target)
        return -1;

    *target = 0;
    QObject *targetObject = 0;

    QWidgetList childList = childWidgets(widget());
    bool complexWidget = childList.size() < childCount();

    switch (relation) {
    // Hierarchical
    case Self:
        targetObject = object();
        break;
    case Child:
        if (complexWidget) {
            if (entry > 0 && entry <= childCount())
                return entry;
            return -1;
        }else {
            if (entry > 0 && childList.size() >= entry)
                targetObject = childList.at(entry - 1);
        }
        break;
    case Ancestor:
        {
            if (entry <= 0)
                return -1;
            targetObject = widget()->parentWidget();
            int i;
            for (i = entry; i > 1 && targetObject; --i)
                targetObject = targetObject->parent();
            if (!targetObject && i == 1)
                targetObject = qApp;
        }
        break;
    case Sibling:
        {
            QAccessibleInterface *iface = QAccessible::queryAccessibleInterface(parentObject());
            if (!iface)
                return -1;

            iface->navigate(Child, entry, target);
            delete iface;
            if (*target)
                return 0;
        }
        break;

    // Geometrical
    case QAccessible::Left:
        if (complexWidget && entry) {
            if (entry < 2 || widget()->height() > widget()->width() + 20) // looks vertical
                return -1;
            return entry - 1;
        }
        // fall through
    case QAccessible::Right:
        if (complexWidget && entry) {
            if (entry >= childCount() || widget()->height() > widget()->width() + 20) // looks vertical
                return -1;
            return entry + 1;
        }
        // fall through
    case QAccessible::Up:
        if (complexWidget && entry) {
            if (entry < 2 || widget()->width() > widget()->height() + 20) // looks horizontal
                return - 1;
            return entry - 1;
        }
        // fall through
    case QAccessible::Down:
        if (complexWidget && entry) {
            if (entry >= childCount() || widget()->width() > widget()->height()  + 20) // looks horizontal
                return - 1;
            return entry + 1;
        } else {
            QAccessibleInterface *pIface = QAccessible::queryAccessibleInterface(parentObject());
            if (!pIface)
                return -1;

            QRect startg = rect(0);
            QPoint startc = startg.center();
            QAccessibleInterface *candidate = 0;
            int mindist = 100000;
            int sibCount = pIface->childCount();
            for (int i = 0; i < sibCount; ++i) {
                QAccessibleInterface *sibling = 0;
                pIface->navigate(Child, i+1, &sibling);
                Q_ASSERT(sibling);
                if ((relationTo(0, sibling, 0) & Self) || (sibling->state(0) & QAccessible::Invisible)) {
                    //ignore ourself and invisible siblings
                    delete sibling;
                    continue;
                }

                QRect sibg = sibling->rect(0);
                QPoint sibc = sibg.center();
                QPoint sibp;
                QPoint startp;
                QPoint distp;
                switch (relation) {
                case QAccessible::Left:
                    startp = QPoint(startg.left(), startg.top() + startg.height() / 2);
                    sibp = QPoint(sibg.right(), sibg.top() + sibg.height() / 2);
                    if (QPoint(sibc - startc).x() >= 0) {
                        delete sibling;
                        continue;
                    }
                    distp = sibp - startp;
                    break;
                case QAccessible::Right:
                    startp = QPoint(startg.right(), startg.top() + startg.height() / 2);
                    sibp = QPoint(sibg.left(), sibg.top() + sibg.height() / 2);
                    if (QPoint(sibc - startc).x() <= 0) {
                        delete sibling;
                        continue;
                    }
                    distp = sibp - startp;
                    break;
                case QAccessible::Up:
                    startp = QPoint(startg.left() + startg.width() / 2, startg.top());
                    sibp = QPoint(sibg.left() + sibg.width() / 2, sibg.bottom());
                    if (QPoint(sibc - startc).y() >= 0) {
                        delete sibling;
                        continue;
                    }
                    distp = sibp - startp;
                    break;
                case QAccessible::Down:
                    startp = QPoint(startg.left() + startg.width() / 2, startg.bottom());
                    sibp = QPoint(sibg.left() + sibg.width() / 2, sibg.top());
                    if (QPoint(sibc - startc).y() <= 0) {
                        delete sibling;
                        continue;
                    }
                    distp = sibp - startp;
                    break;
		default:
		    break;
                }

                int dist = (int)qSqrt((qreal)distp.x() * distp.x() + distp.y() * distp.y());
                if (dist < mindist) {
                    delete candidate;
                    candidate = sibling;
                    mindist = dist;
                } else {
                    delete sibling;
                }
            }
            delete pIface;
            *target = candidate;
            if (*target)
                return 0;
        }
        break;
    case Covers:
        if (entry > 0) {
            QAccessibleInterface *pIface = QAccessible::queryAccessibleInterface(parentObject());
            if (!pIface)
                return -1;

            QRect r = rect(0);
            int sibCount = pIface->childCount();
            QAccessibleInterface *sibling = 0;
            for (int i = pIface->indexOfChild(this) + 1; i <= sibCount && entry; ++i) {
                pIface->navigate(Child, i, &sibling);
                if (!sibling || (sibling->state(0) & Invisible)) {
                    delete sibling;
                    sibling = 0;
                    continue;
                }
                if (sibling->rect(0).intersects(r))
                    --entry;
                if (!entry)
                    break;
                delete sibling;
                sibling = 0;
            }
            delete pIface;
            *target = sibling;
            if (*target)
                return 0;
        }
        break;
    case Covered:
        if (entry > 0) {
            QAccessibleInterface *pIface = QAccessible::queryAccessibleInterface(parentObject());
            if (!pIface)
                return -1;

            QRect r = rect(0);
            int index = pIface->indexOfChild(this);
            QAccessibleInterface *sibling = 0;
            for (int i = 1; i < index && entry; ++i) {
                pIface->navigate(Child, i, &sibling);
                Q_ASSERT(sibling);
                if (!sibling || (sibling->state(0) & Invisible)) {
                    delete sibling;
                    sibling = 0;
                    continue;
                }
                if (sibling->rect(0).intersects(r))
                    --entry;
                if (!entry)
                    break;
                delete sibling;
                sibling = 0;
            }
            delete pIface;
            *target = sibling;
            if (*target)
                return 0;
        }
        break;

    // Logical
    case FocusChild:
        {
            if (widget()->hasFocus()) {
                targetObject = object();
                break;
            }

            QWidget *fw = widget()->focusWidget();
            if (!fw)
                return -1;

            if (isAncestor(widget(), fw) || fw == widget())
                targetObject = fw;
            /* ###
            QWidget *parent = fw;
            while (parent && !targetObject) {
                parent = parent->parentWidget();
                if (parent == widget())
                    targetObject = fw;