qcompleter.cpp

奇趣公司比较新的qt/emd版本

void QCompleterPrivate::_q_autoResizePopup()
{
    if (!popup || !popup->isVisible())
        return;
    showPopup(popupRect);
}

void QCompleterPrivate::showPopup(const QRect& rect)
{
    const QRect screen = QApplication::desktop()->availableGeometry(widget);
    Qt::LayoutDirection dir = widget->layoutDirection();
    QPoint pos;
    int rw, rh, w;
    int h = (popup->sizeHintForRow(0) * qMin(7, popup->model()->rowCount()) + 3) + 3;
    QScrollBar *hsb = popup->horizontalScrollBar();
    if (hsb && hsb->isVisible())
        h += popup->horizontalScrollBar()->sizeHint().height();

    if (rect.isValid()) {
        rh = rect.height();
        w = rw = rect.width();
        pos = widget->mapToGlobal(dir == Qt::RightToLeft ? rect.bottomRight() : rect.bottomLeft());
    } else {
        rh = widget->height();
        rw = widget->width();
        pos = widget->mapToGlobal(QPoint(0, widget->height() - 2));
        w = widget->width();
    }

    if ((pos.x() + rw) > (screen.x() + screen.width()))
        pos.setX(screen.x() + screen.width() - w);
    if (pos.x() < screen.x())
        pos.setX(screen.x());
    if (((pos.y() + rh) > (screen.y() + screen.height())) && ((pos.y() - h - rh) >= 0))
        pos.setY(pos.y() - qMax(h, popup->minimumHeight()) - rh + 2);

    popup->setGeometry(pos.x(), pos.y(), w, h);

    if (!popup->isVisible())
        popup->show();
}

/*!
    Constructs a completer object with the given \a parent.
*/
QCompleter::QCompleter(QObject *parent)
: QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init();
}

/*!
    Constructs a completer object with the given \a parent that provides completions
    from the specified \a model.
*/
QCompleter::QCompleter(QAbstractItemModel *model, QObject *parent)
    : QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init(model);
}

#ifndef QT_NO_STRINGLISTMODEL
/*!
    Constructs a QCompleter object with the given \a parent that uses the specified
    \a list as a source of possible completions.
*/
QCompleter::QCompleter(const QStringList& list, QObject *parent)
: QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init(new QStringListModel(list, this));
}
#endif // QT_NO_STRINGLISTMODEL

/*!
    Destroys the completer object.
*/
QCompleter::~QCompleter()
{
}

/*!
    Sets the widget for which completion are provided for to \a widget. This
    function is automatically called when a QCompleter is set on a QLineEdit
    using QLineEdit::setCompleter() or on a QComboBox using
    QComboBox::setCompleter(). The widget needs to be set explicitly when
    providing completions for custom widgets.

    \sa widget(), setModel(), setPopup()
 */
void QCompleter::setWidget(QWidget *widget)
{
    Q_D(QCompleter);
    if (d->widget)
        d->widget->removeEventFilter(this);
    d->widget = widget;
    if (d->widget)
        d->widget->installEventFilter(this);
    if (d->popup) {
        d->popup->hide();
        d->popup->setFocusProxy(d->widget);
    }
}

/*!
    Returns the widget for which the completer object is providing completions.

    \sa setWidget()
 */
QWidget *QCompleter::widget() const
{
    Q_D(const QCompleter);
    return d->widget;
}

/*!
    Sets the model which provides completions to \a model. The \a model can
    be list model or a tree model. If a model has been already previously set
    and it has the QCompleter as its parent, it is deleted.

    For convenience, if \a model is a QDirModel, QCompleter switches its
    caseSensitivity to Qt::CaseInsensitive on Windows and Qt::CaseSensitive
    on other platforms.

    \sa completionModel(), modelSorting, {Handling Tree Models}
*/
void QCompleter::setModel(QAbstractItemModel *model)
{
    Q_D(QCompleter);
    QAbstractItemModel *oldModel = d->proxy->sourceModel();
    d->proxy->setSourceModel(model);
    if (d->popup)
        setPopup(d->popup); // set the model and make new connections
    if (oldModel && oldModel->QObject::parent() == this)
        delete oldModel;
#ifndef QT_NO_DIRMODEL
    if (qobject_cast<QDirModel *>(model)) {
#ifdef Q_OS_WIN
        setCaseSensitivity(Qt::CaseInsensitive);
#else
        setCaseSensitivity(Qt::CaseSensitive);
#endif
    }
#endif // QT_NO_DIRMODEL
}

/*!
    Returns the model that provides completion strings.

    \sa completionModel()
*/
QAbstractItemModel *QCompleter::model() const
{
    Q_D(const QCompleter);
    return d->proxy->sourceModel();
}

/*!
    \enum QCompleter::CompletionMode

    This enum specifies how completions are provided to the user.

    \value PopupCompletion            Current completions are displayed in a popup window.
    \value InlineCompletion           Completions appear inline (as selected text).
    \value UnfilteredPopupCompletion  All possible completions are displayed in a popup window with the most likely suggestion selected.

    \sa setCompletionMode()
*/

/*!
    \property QCompleter::completionMode
    \brief how the completions are provided to the user

    The default value is QCompleter::PopupCompletion.
*/
void QCompleter::setCompletionMode(QCompleter::CompletionMode mode)
{
    Q_D(QCompleter);
    d->mode = mode;
    d->proxy->setFiltered(mode != QCompleter::UnfilteredPopupCompletion);

    if (mode == QCompleter::InlineCompletion) {
        if (d->widget)
            d->widget->removeEventFilter(this);
        if (d->popup) {
            d->popup->deleteLater();
            d->popup = 0;
        }
    } else {
        if (d->widget)
            d->widget->installEventFilter(this);
    }
}

QCompleter::CompletionMode QCompleter::completionMode() const
{
    Q_D(const QCompleter);
    return d->mode;
}

/*!
    Sets the popup used to display completions to \a popup. QCompleter takes
    ownership of the view.

    A QListView is automatically created when the completionMode() is set to
    QCompleter::PopupCompletion or QCompleter::UnfilteredPopupCompletion. The
    default popup displays the completionColumn().

    Ensure that this function is called before the view settings are modified.
    This is required since view's properties may require that a model has been
    set on the view (for example, hiding columns in the view requires a model
    to be set on the view).

    \sa popup()
*/
void QCompleter::setPopup(QAbstractItemView *popup)
{
    Q_D(QCompleter);
    Q_ASSERT(popup != 0);
    if (d->popup) {
        QObject::disconnect(d->popup->selectionModel(), 0, this, 0);
        QObject::disconnect(d->popup, 0, this, 0);
    }
    if (d->popup != popup)
        delete d->popup;
    if (popup->model() != d->proxy)
        popup->setModel(d->proxy);
    popup->hide();
    popup->setParent(0, Qt::Popup);
    popup->setFocusPolicy(Qt::NoFocus);
    popup->setFocusProxy(d->widget);
    popup->installEventFilter(this);
    popup->setItemDelegate(new QCompleterItemDelegate(popup));

    QObject::connect(popup, SIGNAL(clicked(QModelIndex)),
                     this, SLOT(_q_complete(QModelIndex)));
    QObject::connect(popup, SIGNAL(clicked(QModelIndex)), popup, SLOT(hide()));

    QObject::connect(popup->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
                     this, SLOT(_q_completionSelected(QItemSelection)));
    d->popup = popup;
}

/*!
    Returns the popup used to display completions.

    \sa setPopup()
*/
QAbstractItemView *QCompleter::popup() const
{
    Q_D(const QCompleter);
#ifndef QT_NO_LISTVIEW
    if (!d->popup && completionMode() != QCompleter::InlineCompletion) {
        QListView *listView = new QListView;
        listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
        listView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        listView->setSelectionBehavior(QAbstractItemView::SelectRows);
        listView->setSelectionMode(QAbstractItemView::SingleSelection);
        listView->setModelColumn(d->column);
        QCompleter *that = const_cast<QCompleter*>(this);
        that->setPopup(listView);
    }
#endif // QT_NO_LISTVIEW
    return d->popup;
}

/*!
  \reimp
*/
bool QCompleter::event(QEvent *ev)
{
    return QObject::event(ev);
}

/*!
  \reimp
*/
bool QCompleter::eventFilter(QObject *o, QEvent *e)
{
    Q_D(QCompleter);

    if (d->eatFocusOut && o == d->widget && e->type() == QEvent::FocusOut) {
        if (d->popup && d->popup->isVisible())
            return true;
    }

    if (o != d->popup)
        return QObject::eventFilter(o, e);

    switch (e->type()) {
    case QEvent::KeyPress: {
        QKeyEvent *ke = static_cast<QKeyEvent *>(e);

        QModelIndex curIndex = d->popup->currentIndex();
        QModelIndexList selList = d->popup->selectionModel()->selectedIndexes();

        const int key = ke->key();
        // In UnFilteredPopup mode, select the current item
        if ((key == Qt::Key_Up || key == Qt::Key_Down) && selList.isEmpty() && curIndex.isValid()
            && d->mode == QCompleter::UnfilteredPopupCompletion) {
              d->setCurrentIndex(curIndex);
              return true;
        }

        // Handle popup navigation keys. These are hardcoded because up/down might make the
        // widget do something else (lineedit cursor moves to home/end on mac, for instance)
        switch (key) {
        case Qt::Key_End:
        case Qt::Key_Home:
            if (ke->modifiers() & Qt::ControlModifier)
                return false;
            break;

        case Qt::Key_Up:
            if (!curIndex.isValid()) {
                int rowCount = d->proxy->rowCount();
                QModelIndex lastIndex = d->proxy->index(rowCount - 1, 0);
                d->setCurrentIndex(lastIndex);
                return true;
            } else if (curIndex.row() == 0) {
                if (d->wrap)
                    d->setCurrentIndex(QModelIndex());
                return true;
            }
            return false;

        case Qt::Key_Down:
            if (!curIndex.isValid()) {
                QModelIndex firstIndex = d->proxy->index(0, 0);
                d->setCurrentIndex(firstIndex);
                return true;
            } else if (curIndex.row() == d->proxy->rowCount() - 1) {
                if (d->wrap)
                    d->setCurrentIndex(QModelIndex());
                return true;
            }
            return false;

        case Qt::Key_PageUp:
        case Qt::Key_PageDown:
            return false;
        }

        // Send the event to the widget. If the widget accepted the event, do nothing
        // If the widget did not accept the event, provide a default implementation
        d->eatFocusOut = false;
        (static_cast<QObject *>(d->widget))->event(ke);
        d->eatFocusOut = true;
        if (!d->widget || e->isAccepted() || !d->popup->isVisible()) {
            // widget lost focus, hide the popup
            if (d->widget && (!d->widget->hasFocus()
#ifdef QT_KEYPAD_NAVIGATION
                || (QApplication::keypadNavigationEnabled() && !d->widget->hasEditFocus())
#endif
                ))
                d->popup->hide();
            return true;
        }

        // default implementation for keys not handled by the widget when popup is open
        switch (key) {
        case Qt::Key_Return:
        case Qt::Key_Enter:
        case Qt::Key_Tab:
#ifdef QT_KEYPAD_NAVIGATION
        case Qt::Key_Select:
            if (!QApplication::keypadNavigationEnabled())
                break;
#endif
            d->popup->hide();
            if (curIndex.isValid())
                d->_q_complete(curIndex);
            break;

        case Qt::Key_F4:
            if (ke->modifiers() & Qt::AltModifier)
                d->popup->hide();
            break;

        case Qt::Key_Backtab:
        case Qt::Key_Escape:
            d->popup->hide();
            break;

        default:
            break;
        }

        return true;
    }

#ifdef QT_KEYPAD_NAVIGATION
    case QEvent::KeyRelease: {
        QKeyEvent *ke = static_cast<QKeyEvent *>(e);
        if (QApplication::keypadNavigationEnabled() && ke->key() == Qt::Key_Back) {
            // Send the event to the 'widget'. This is what we did for KeyPress, so we need
            // to do the same for KeyRelease, in case the widget's KeyPress event set
            // up something (such as a timer) that is relying on also receiving the
            // key release. I see this as a bug in Qt, and should really set it up for all
            // the affected keys. However, it is difficult to tell how this will affect
            // existing code, and I can't test for every combination!
            d->eatFocusOut = false;
            static_cast<QObject *>(d->widget)->event(ke);
            d->eatFocusOut = true;
        }
        break;
    }
#endif

    case QEvent::MouseButtonPress: {
#ifdef QT_KEYPAD_NAVIGATION
        if (QApplication::keypadNavigationEnabled()) {
            // if we've clicked in the widget (or its descendant), let it handle the click
            QWidget *source = qobject_cast<QWidget *>(o);
            if (source) {
                QPoint pos = source->mapToGlobal((static_cast<QMouseEvent *>(e))->pos());
                QWidget *target = QApplication::widgetAt(pos);
                if (target && (d->widget->isAncestorOf(target) ||
                    target == d->widget)) {
                    d->eatFocusOut = false;
                    static_cast<QObject *>(target)->event(e);
                    d->eatFocusOut = true;
                    return true;
                }
            }
        }