qdatawidgetmapper.cpp

奇趣公司比较新的qt/emd版本

    d->flipEventFilters(oldDelegate, delegate);
}

/*!
    Returns the current item delegate.
 */
QAbstractItemDelegate *QDataWidgetMapper::itemDelegate() const
{
    Q_D(const QDataWidgetMapper);
    return d->delegate;
}

/*!
    Sets the root item to \a index. This can be used to display
    a branch of a tree. Pass an invalid model index to display
    the top-most branch.

    \sa rootIndex()
 */
void QDataWidgetMapper::setRootIndex(const QModelIndex &index)
{
    Q_D(QDataWidgetMapper);
    d->rootIndex = index;
}

/*!
    Returns the current root index.

    \sa setRootIndex()
*/
QModelIndex QDataWidgetMapper::rootIndex() const
{
    Q_D(const QDataWidgetMapper);
    return QModelIndex(d->rootIndex);
}

/*!
    Adds a mapping between a \a widget and a \a section from the model.
    The \a section is a column in the model if the orientation is
    horizontal (the default), otherwise a row.

    For the following example, we assume a model \c myModel that
    has two columns: the first one contains the names of people in a
    group, and the second column contains their ages. The first column
    is mapped to the QLineEdit \c nameLineEdit, and the second is
    mapped to the QSpinBox \c{ageSpinBox}:

    \code
    QDataWidgetMapper *mapper = new QDataWidgetMapper();
    mapper->setModel(myModel);
    mapper->addMapping(nameLineEdit, 0);
    mapper->addMapping(ageSpinBox, 1);
    \endcode

    \bold{Notes:}
    \list
    \o If the \a widget is already mapped to a section, the
    old mapping will be replaced by the new one.
    \o Only one-to-one mappings between sections and widgets are allowed.
    It is not possible to map a single section to multiple widgets, or to
    map a single widget to multiple sections.
    \endlist

    \sa removeMapping(), mappedSection(), clearMapping()
 */
void QDataWidgetMapper::addMapping(QWidget *widget, int section)
{
    Q_D(QDataWidgetMapper);

    removeMapping(widget);
    d->widgetMap.append(QDataWidgetMapperPrivate::WidgetMapper(widget, section));
    widget->installEventFilter(d->delegate);
}

/*!
  \since 4.3

  Essentially the same as addMapping(), but adds the possibility to specify
  the property to use specifying \a propertyName.

  \sa addMapping()
*/

void QDataWidgetMapper::addMapping(QWidget *widget, int section, const QByteArray &propertyName)
{
    Q_D(QDataWidgetMapper);

    removeMapping(widget);
    d->widgetMap.append(QDataWidgetMapperPrivate::WidgetMapper(widget, section, propertyName));
    widget->installEventFilter(d->delegate);
}

/*!
    Removes the mapping for the given \a widget.

    \sa addMapping(), clearMapping()
 */
void QDataWidgetMapper::removeMapping(QWidget *widget)
{
    Q_D(QDataWidgetMapper);

    int idx = d->findWidget(widget);
    if (idx == -1)
        return;

    d->widgetMap.removeAt(idx);
    widget->removeEventFilter(d->delegate);
}

/*!
    Returns the section the \a widget is mapped to or -1
    if the widget is not mapped.

    \sa addMapping(), removeMapping()
 */
int QDataWidgetMapper::mappedSection(QWidget *widget) const
{
    Q_D(const QDataWidgetMapper);

    int idx = d->findWidget(widget);
    if (idx == -1)
        return -1;

    return d->widgetMap.at(idx).section;
}

/*!
  \since 4.3
  Returns the name of the property that is used when mapping
  data to the given \a widget.

  \sa mappedSection(), addMapping(), removeMapping()
*/

QByteArray QDataWidgetMapper::mappedPropertyName(QWidget *widget) const
{
    Q_D(const QDataWidgetMapper);

    int idx = d->findWidget(widget);
    if (idx == -1)
        return QByteArray();
    const QDataWidgetMapperPrivate::WidgetMapper &m = d->widgetMap.at(idx);
    if (m.property.isEmpty())
        return m.widget->metaObject()->userProperty().name();
    else
        return m.property;
}

/*!
    Returns the widget that is mapped at \a section, or
    0 if no widget is mapped at that section.

    \sa addMapping(), removeMapping()
 */
QWidget *QDataWidgetMapper::mappedWidgetAt(int section) const
{
    Q_D(const QDataWidgetMapper);

    for (int i = 0; i < d->widgetMap.count(); ++i) {
        if (d->widgetMap.at(i).section == section)
            return d->widgetMap.at(i).widget;
    }

    return 0;
}

/*!
    Repopulates all widgets with the current data of the model.
    All unsubmitted changes will be lost.

    \sa submit(), setSubmitPolicy()
 */
void QDataWidgetMapper::revert()
{
    Q_D(QDataWidgetMapper);

    d->populate();
}

/*!
    Submits all changes from the mapped widgets to the model.

    For every mapped section, the item delegate reads the current
    value from the widget and sets it in the model. Finally, the
    model's \l {QAbstractItemModel::}{submit()} method is invoked.

    Returns true if all the values were submitted, otherwise false.

    Note: For database models, QSqlQueryModel::lastError() can be
    used to retrieve the last error.

    \sa revert(), setSubmitPolicy()
 */
bool QDataWidgetMapper::submit()
{
    Q_D(QDataWidgetMapper);

    for (int i = 0; i < d->widgetMap.count(); ++i) {
        const QDataWidgetMapperPrivate::WidgetMapper &m = d->widgetMap.at(i);
        if (!d->commit(m))
            return false;
    }

    return d->model->submit();
}

/*!
    Populates the widgets with data from the first row of the model
    if the orientation is horizontal (the default), otherwise
    with data from the first column.

    This is equivalent to calling \c setCurrentIndex(0).

    \sa toLast(), setCurrentIndex()
 */
void QDataWidgetMapper::toFirst()
{
    setCurrentIndex(0);
}

/*!
    Populates the widgets with data from the last row of the model
    if the orientation is horizontal (the default), otherwise
    with data from the last column.

    Calls setCurrentIndex() internally.

    \sa toFirst(), setCurrentIndex()
 */
void QDataWidgetMapper::toLast()
{
    Q_D(QDataWidgetMapper);
    setCurrentIndex(d->itemCount() - 1);
}


/*!
    Populates the widgets with data from the next row of the model
    if the orientation is horizontal (the default), otherwise
    with data from the next column.

    Calls setCurrentIndex() internally. Does nothing if there is
    no next row in the model.

    \sa toPrevious(), setCurrentIndex()
 */
void QDataWidgetMapper::toNext()
{
    Q_D(QDataWidgetMapper);
    setCurrentIndex(d->currentIdx() + 1);
}

/*!
    Populates the widgets with data from the previous row of the model
    if the orientation is horizontal (the default), otherwise
    with data from the previous column.

    Calls setCurrentIndex() internally. Does nothing if there is
    no previous row in the model.

    \sa toNext(), setCurrentIndex()
 */
void QDataWidgetMapper::toPrevious()
{
    Q_D(QDataWidgetMapper);
    setCurrentIndex(d->currentIdx() - 1);
}

/*!
    \property QDataWidgetMapper::currentIndex
    \brief the current row or column

    The widgets are populated with with data from the row at \a index
    if the orientation is horizontal (the default), otherwise with
    data from the column at \a index.

    \sa setCurrentModelIndex(), toFirst(), toNext(), toPrevious(), toLast()
*/
void QDataWidgetMapper::setCurrentIndex(int index)
{
    Q_D(QDataWidgetMapper);

    if (index < 0 || index >= d->itemCount())
        return;
    d->currentTopLeft = d->orientation == Qt::Horizontal
                            ? d->model->index(index, 0, d->rootIndex)
                            : d->model->index(0, index, d->rootIndex);
    d->populate();

    emit currentIndexChanged(index);
}

int QDataWidgetMapper::currentIndex() const
{
    Q_D(const QDataWidgetMapper);
    return d->currentIdx();
}

/*!
    Sets the current index to the row of the \a index if the
    orientation is horizontal (the default), otherwise to the
    column of the \a index.

    Calls setCurrentIndex() internally. This convenience slot can be
    connected to the signal \l
    {QItemSelectionModel::}{currentRowChanged()} or \l
    {QItemSelectionModel::}{currentColumnChanged()} of another view's
    \l {QItemSelectionModel}{selection model}.

    The following example illustrates how to update all widgets
    with new data whenever the selection of a QTableView named
    \c myTableView changes:

    \code
    QDataWidgetMapper *mapper = new QDataWidgetMapper(); 
    connect(myTableView->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
            mapper, SLOT(setCurrentModelIndex(QModelIndex)));
    \endcode

    \sa currentIndex()
*/
void QDataWidgetMapper::setCurrentModelIndex(const QModelIndex &index)
{
    Q_D(QDataWidgetMapper);

    if (!index.isValid()
        || index.model() != d->model
        || index.parent() != d->rootIndex)
        return;

    setCurrentIndex(d->orientation == Qt::Horizontal ? index.row() : index.column());
}

/*!
    Clears all mappings.

    \sa addMapping(), removeMapping()
 */
void QDataWidgetMapper::clearMapping()
{
    Q_D(QDataWidgetMapper);

    while (!d->widgetMap.isEmpty()) {
        QWidget *w = d->widgetMap.takeLast().widget;
        if (w)
            w->removeEventFilter(d->delegate);
    }
}

/*!
    \property QDataWidgetMapper::orientation
    \brief the orientation of the model

    If the orientation is Qt::Horizontal (the default), a widget is
    mapped to a column of a data model. The widget will be populated
    with the model's data from its mapped column and the row that
    currentIndex() points at.

    Use Qt::Horizontal for tabular data that looks like this:

    \table
    \row \o 1 \o Trolltech ASA     \o Oslo
    \row \o 2 \o Trolltech Pty   \o Brisbane
    \row \o 3 \o Trolltech Inc   \o Silicon Valley
    \row \o 4 \o Trolltech China \o Beijing
    \row \o 5 \o Trolltech GmbH  \o Berlin
    \endtable

    If the orientation is set to Qt::Vertical, a widget is mapped to
    a row. Calling setCurrentIndex() will change the current column.
    The widget will be populates with the model's data from its
    mapped row and the column that currentIndex() points at.

    Use Qt::Vertical for tabular data that looks like this:

    \table
    \row \o 1 \o 2 \o 3 \o 4 \o 5
    \row \o Trolltech ASA \o Trolltech Pty \o Trolltech Inc \o Trolltech China \o Trolltech GmbH
    \row \o Oslo \o Brisbane \o Silicon Valley \o Beijing \i Berlin
    \endtable

    Changing the orientation clears all existing mappings.
*/
void QDataWidgetMapper::setOrientation(Qt::Orientation orientation)
{
    Q_D(QDataWidgetMapper);

    if (d->orientation == orientation)
        return;

    clearMapping();
    d->orientation = orientation;
}

Qt::Orientation QDataWidgetMapper::orientation() const
{
    Q_D(const QDataWidgetMapper);
    return d->orientation;
}

/*!
    \property QDataWidgetMapper::submitPolicy
    \brief the current submit policy

    Changing the current submit policy will revert all widgets
    to the current data from the model.
*/
void QDataWidgetMapper::setSubmitPolicy(SubmitPolicy policy)
{
    Q_D(QDataWidgetMapper);
    if (policy == d->submitPolicy)
        return;

    revert();
    d->submitPolicy = policy;
}

QDataWidgetMapper::SubmitPolicy QDataWidgetMapper::submitPolicy() const
{
    Q_D(const QDataWidgetMapper);
    return d->submitPolicy;
}

#include "moc_qdatawidgetmapper.cpp"

#endif // QT_NO_DATAWIDGETMAPPER