complexwidgets.cpp

奇趣公司比较新的qt/emd版本

        r = comboBox()->style()->subControlRect(QStyle::CC_ComboBox, &option, sc, comboBox());
    }
    return QRect(tp.x() + r.x(), tp.y() + r.y(), r.width(), r.height());
}

/*! \reimp */
int QAccessibleComboBox::navigate(RelationFlag rel, int entry, QAccessibleInterface **target) const
{
    *target = 0;
    if (entry > ComboBoxSelf) switch (rel) {
    case Child:
        if (entry < PopupList)
            return entry;
        if (entry == PopupList) {
            QAbstractItemView *view = comboBox()->view();
            QWidget *parent = view ? view->parentWidget() : 0;
            *target = QAccessible::queryAccessibleInterface(parent);
            return *target ? 0 : -1;
        }
    case QAccessible::Left:
        return entry == OpenList ? CurrentText : -1;
    case QAccessible::Right:
        return entry == CurrentText ? OpenList : -1;
    case QAccessible::Up:
        return -1;
    case QAccessible::Down:
        return -1;
    default:
        break;
    }
    return QAccessibleWidgetEx::navigate(rel, entry, target);
}

/*! \reimp */
int QAccessibleComboBox::childCount() const
{
    return comboBox()->view() ? PopupList : OpenList;
}

/*! \reimp */
int QAccessibleComboBox::childAt(int x, int y) const
{
    if (!comboBox()->isVisible())
        return -1;
    QPoint gp = widget()->mapToGlobal(QPoint(0, 0));
    if (!QRect(gp.x(), gp.y(), widget()->width(), widget()->height()).contains(x, y))
        return -1;

    // a complex control
    for (int i = 1; i < PopupList; ++i) {
        if (rect(i).contains(x, y))
            return i;
    }
    return 0;
}

/*! \reimp */
int QAccessibleComboBox::indexOfChild(const QAccessibleInterface *child) const
{
    QObject *viewParent = comboBox()->view() ? comboBox()->view()->parentWidget() : 0;
    if (child->object() == viewParent)
        return PopupList;
    return -1;
}

/*! \reimp */
QString QAccessibleComboBox::text(Text t, int child) const
{
    QString str;

    switch (t) {
    case Name:
        if (child == OpenList)
            str = QComboBox::tr("Open");
        else
            str = QAccessibleWidgetEx::text(t, 0);
        break;
#ifndef QT_NO_SHORTCUT
    case Accelerator:
        if (child == OpenList)
            str = (QString)QKeySequence(Qt::Key_Down);
        // missing break?
#endif
    case Value:
        if (comboBox()->isEditable())
            str = comboBox()->lineEdit()->text();
        else
            str = comboBox()->currentText();
        break;
    default:
        break;
    }
    if (str.isEmpty())
        str = QAccessibleWidgetEx::text(t, 0);
    return str;
}

/*! \reimp */
QAccessible::Role QAccessibleComboBox::role(int child) const
{
    switch (child) {
    case CurrentText:
        if (comboBox()->isEditable())
            return EditableText;
        return StaticText;
    case OpenList:
        return PushButton;
    case PopupList:
        return List;
    default:
        return ComboBox;
    }
}

/*! \reimp */
QAccessible::State QAccessibleComboBox::state(int /*child*/) const
{
    return QAccessibleWidgetEx::state(0);
}

/*! \reimp */
bool QAccessibleComboBox::doAction(int action, int child, const QVariantList &)
{
    if (child == 2 && (action == DefaultAction || action == Press)) {
        if (comboBox()->view()->isVisible()) {
            comboBox()->hidePopup();
        } else {
            comboBox()->showPopup();
        }
        return true;
    }
    return false;
}

QString QAccessibleComboBox::actionText(int action, Text t, int child) const
{
    QString text;
    if (child == 2 && t == Name && (action == DefaultAction || action == Press))
        text = comboBox()->view()->isVisible() ? QComboBox::tr("Close") : QComboBox::tr("Open");
    return text;
}
#endif // QT_NO_COMBOBOX

static inline void removeInvisibleWidgetsFromList(QWidgetList *list)
{
    if (!list || list->isEmpty())
        return;

    for (int i = 0; i < list->count(); ++i) {
        QWidget *widget = list->at(i);
        if (!widget->isVisible())
            list->removeAt(i);
    }
}

#ifndef QT_NO_SCROLLAREA
// ======================= QAccessibleAbstractScrollArea =======================
QAccessibleAbstractScrollArea::QAccessibleAbstractScrollArea(QWidget *widget)
    : QAccessibleWidgetEx(widget, Client)
{
    Q_ASSERT(qobject_cast<QAbstractScrollArea *>(widget));
}

QString QAccessibleAbstractScrollArea::text(Text textType, int child) const
{
    if (child == Self)
        return QAccessibleWidgetEx::text(textType, 0);
    QWidgetList children = accessibleChildren();
    if (child < 1 || child > children.count())
        return QString();
    QAccessibleInterface *childInterface = queryAccessibleInterface(children.at(child - 1));
    if (!childInterface)
        return QString();
    QString string = childInterface->text(textType, 0);
    delete childInterface;
    return string;
}

void QAccessibleAbstractScrollArea::setText(Text textType, int child, const QString &text)
{
    if (text.isEmpty())
        return;
    if (child == 0) {
        QAccessibleWidgetEx::setText(textType, 0, text);
        return;
    }
    QWidgetList children = accessibleChildren();
    if (child < 1 || child > children.count())
        return;
    QAccessibleInterface *childInterface = queryAccessibleInterface(children.at(child - 1));
    if (!childInterface)
        return;
    childInterface->setText(textType, 0, text);
    delete childInterface;
}

QAccessible::State QAccessibleAbstractScrollArea::state(int child) const
{
    if (child == Self)
        return QAccessibleWidgetEx::state(child);
    QWidgetList children = accessibleChildren();
    if (child < 1 || child > children.count())
        return QAccessibleWidgetEx::state(Self);
    QAccessibleInterface *childInterface = queryAccessibleInterface(children.at(child - 1));
    if (!childInterface)
        return QAccessibleWidgetEx::state(Self);
    QAccessible::State returnState = childInterface->state(0);
    delete childInterface;
    return returnState;
}

QVariant QAccessibleAbstractScrollArea::invokeMethodEx(QAccessible::Method, int, const QVariantList &)
{
    return QVariant();
}

int QAccessibleAbstractScrollArea::childCount() const
{
    return accessibleChildren().count();
}

int QAccessibleAbstractScrollArea::indexOfChild(const QAccessibleInterface *child) const
{
    if (!child || !child->object())
        return -1;
    int index = accessibleChildren().indexOf(qobject_cast<QWidget *>(child->object()));
    if (index >= 0)
        return ++index;
    return -1;
}

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

    *target = 0;

    QWidget *targetWidget = 0;
    QWidget *entryWidget = 0;

    if (relation == Child ||
        relation == Left || relation == Up || relation == Right || relation == Down) {
        QWidgetList children = accessibleChildren();
        if (entry < 0 || entry > children.count())
            return -1;

        if (entry == Self)
            entryWidget = abstractScrollArea();
        else
            entryWidget = children.at(entry - 1);
        AbstractScrollAreaElement entryElement = elementType(entryWidget);

        // Not one of the most beautiful switches I've ever seen, but I believe it has
        // to be like this since each case need special handling.
        // It might be possible to make it more general, but I'll leave that as an exercise
        // to the reader. :-)
        switch (relation) {
        case Child:
            if (entry > 0)
                targetWidget = children.at(entry - 1);
            break;
        case Left:
            if (entry < 1)
                break;
            switch (entryElement) {
            case Viewport:
                if (!isLeftToRight())
                    targetWidget = abstractScrollArea()->verticalScrollBar();
                break;
            case HorizontalContainer:
                if (!isLeftToRight())
                    targetWidget = abstractScrollArea()->cornerWidget();
                break;
            case VerticalContainer:
                if (isLeftToRight())
                    targetWidget = abstractScrollArea()->viewport();
                break;
            case CornerWidget:
                if (isLeftToRight())
                    targetWidget = abstractScrollArea()->horizontalScrollBar();
                break;
            default:
                break;
            }
            break;
        case Right:
            if (entry < 1)
                break;
            switch (entryElement) {
            case Viewport:
                if (isLeftToRight())
                    targetWidget = abstractScrollArea()->verticalScrollBar();
                break;
            case HorizontalContainer:
                targetWidget = abstractScrollArea()->cornerWidget();
                break;
            case VerticalContainer:
                if (!isLeftToRight())
                    targetWidget = abstractScrollArea()->viewport();
                break;
            case CornerWidget:
                if (!isLeftToRight())
                    targetWidget = abstractScrollArea()->horizontalScrollBar();
                break;
            default:
                break;
            }
            break;
        case Up:
            if (entry < 1)
                break;
            switch (entryElement) {
            case HorizontalContainer:
                targetWidget = abstractScrollArea()->viewport();
                break;
            case CornerWidget:
                targetWidget = abstractScrollArea()->verticalScrollBar();
                break;
            default:
                break;
            }
            break;
        case Down:
            if (entry < 1)
                break;
            switch (entryElement) {
            case Viewport:
                targetWidget = abstractScrollArea()->horizontalScrollBar();
                break;
            case VerticalContainer:
                targetWidget = abstractScrollArea()->cornerWidget();
                break;
            default:
                break;
            }
            break;
        default:
            break;
        }
    } else {
        return QAccessibleWidgetEx::navigate(relation, entry, target);
    }

    if (qobject_cast<const QScrollBar *>(targetWidget))
        targetWidget = targetWidget->parentWidget();
    *target = QAccessible::queryAccessibleInterface(targetWidget);
    return *target ? 0: -1;
}

QRect QAccessibleAbstractScrollArea::rect(int child) const
{
    if (!abstractScrollArea()->isVisible())
        return QRect();
    if (child == Self)
        return QAccessibleWidgetEx::rect(child);
    QWidgetList children = accessibleChildren();
    if (child < 1 || child > children.count())
        return QRect();
    const QWidget *childWidget = children.at(child - 1);
    if (!childWidget->isVisible())
        return QRect();
    return QRect(childWidget->mapToGlobal(QPoint(0, 0)), childWidget->size());
}

int QAccessibleAbstractScrollArea::childAt(int x, int y) const
{
    if (!abstractScrollArea()->isVisible())
        return -1;
    const QRect globalSelfGeometry = rect(Self);
    if (!globalSelfGeometry.isValid() || !globalSelfGeometry.contains(QPoint(x, y)))
        return -1;
    const QWidgetList children = accessibleChildren();
    for (int i = 0; i < children.count(); ++i) {
        const QWidget *child = children.at(i);
        const QRect globalChildGeometry = QRect(child->mapToGlobal(QPoint(0, 0)), child->size());
        if (globalChildGeometry.contains(QPoint(x, y))) {
            return ++i;
        }
    }
    return 0;
}

QAbstractScrollArea *QAccessibleAbstractScrollArea::abstractScrollArea() const
{
    return static_cast<QAbstractScrollArea *>(object());
}

QWidgetList QAccessibleAbstractScrollArea::accessibleChildren() const
{
    QWidgetList children;

    // Viewport.
    QWidget * viewport = abstractScrollArea()->viewport();
    if (viewport)
        children.append(viewport);

    // Horizontal scrollBar container.
    QScrollBar *horizontalScrollBar = abstractScrollArea()->horizontalScrollBar();
    if (horizontalScrollBar && horizontalScrollBar->isVisible()) {
        children.append(horizontalScrollBar->parentWidget());
    }

    // Vertical scrollBar container.
    QScrollBar *verticalScrollBar = abstractScrollArea()->verticalScrollBar();
    if (verticalScrollBar && verticalScrollBar->isVisible()) {
        children.append(verticalScrollBar->parentWidget());
    }

    // CornerWidget.
    QWidget *cornerWidget = abstractScrollArea()->cornerWidget();
    if (cornerWidget && cornerWidget->isVisible())
        children.append(cornerWidget);

    return children;
}

QAccessibleAbstractScrollArea::AbstractScrollAreaElement
QAccessibleAbstractScrollArea::elementType(QWidget *widget) const
{
    if (!widget)
        return Undefined;

    if (widget == abstractScrollArea())
        return Self;
    if (widget == abstractScrollArea()->viewport())
        return Viewport;
    if (widget->objectName() == QLatin1String("qt_scrollarea_hcontainer"))
        return HorizontalContainer;
    if (widget->objectName() == QLatin1String("qt_scrollarea_vcontainer"))
        return VerticalContainer;
    if (widget == abstractScrollArea()->cornerWidget())
        return CornerWidget;

    return Undefined;
}

bool QAccessibleAbstractScrollArea::isLeftToRight() const
{
    return abstractScrollArea()->isLeftToRight();
}

// ======================= QAccessibleScrollArea ===========================
QAccessibleScrollArea::QAccessibleScrollArea(QWidget *widget)
    : QAccessibleAbstractScrollArea(widget)
{
    Q_ASSERT(qobject_cast<QScrollArea *>(widget));
}
#endif // QT_NO_SCROLLAREA

#endif // QT_NO_ACCESSIBILITY