qtreeview.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

            d->expand(vi, true);
        updateGeometries();
        viewport()->update();
        break;
    case MovePageUp:
        return d->modelIndex(d->pageUp(vi));
    case MovePageDown:
        return d->modelIndex(d->pageDown(vi));
    case MoveHome:
        return model()->index(0, 0, rootIndex());
    case MoveEnd:
        return d->modelIndex(d->viewItems.count() - 1);
    }
    return current;
}

/*!
  Applies the selection \a command to the items in or touched by the
  rectangle, \a rect.

  \sa selectionCommand()
*/
void QTreeView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
{
    Q_D(QTreeView);
    if (!selectionModel())
        return;

    QPoint tl(isRightToLeft() ? rect.right() : rect.left(), rect.top());
    QPoint br(isRightToLeft() ? rect.left() : rect.right(), rect.bottom());
    QModelIndex topLeft = indexAt(tl);
    QModelIndex bottomRight = indexAt(br);
    if (selectionBehavior() != SelectRows) {
        QItemSelection selection;
        if (topLeft.isValid() && bottomRight.isValid()) {
            selection.append(QItemSelectionRange(topLeft, bottomRight));
            selectionModel()->select(selection, command);
        }
    } else {
        d->select(d->viewIndex(topLeft), d->viewIndex(bottomRight), command);
    }
}

/*!
  Returns the rectangle from the viewport of the items in the given
  \a selection.
*/
QRegion QTreeView::visualRegionForSelection(const QItemSelection &selection) const
{
    if (selection.isEmpty())
        return QRegion();

    QRegion selectionRegion;
    for (int i = 0; i < selection.count(); ++i) {
        QItemSelectionRange range = selection.at(i);
        if (!range.isValid())
            continue;
        QModelIndex parent = range.parent();
        QModelIndex leftIndex = range.topLeft();
        int columnCount = model()->columnCount(parent);
        while (leftIndex.isValid() && isIndexHidden(leftIndex)) {
            if (leftIndex.column() + 1 < columnCount)
                leftIndex = model()->index(leftIndex.row(), leftIndex.column() + 1, parent);
            else
                leftIndex = QModelIndex();
        }
        if (!leftIndex.isValid())
            continue;
        int top = visualRect(leftIndex).top();
        QModelIndex rightIndex = range.bottomRight();
        while (rightIndex.isValid() && isIndexHidden(rightIndex)) {
            if (rightIndex.column() - 1 >= 0)
                rightIndex = model()->index(rightIndex.row(), rightIndex.column() - 1, parent);
            else
                rightIndex = QModelIndex();
        }
        if (!rightIndex.isValid())
            continue;
        int bottom = visualRect(rightIndex).bottom();
        if (top > bottom)
            qSwap<int>(top, bottom);
        int height = bottom - top + 1;
        for (int c = range.left(); c <= range.right(); ++c)
            selectionRegion += QRegion(QRect(columnViewportPosition(c), top,
                                             columnWidth(c), height));
    }
    return selectionRegion;
}

/*!
  \reimp
*/
QModelIndexList QTreeView::selectedIndexes() const
{
    QModelIndexList viewSelected;
    QModelIndexList modelSelected;
    if (selectionModel())
        modelSelected = selectionModel()->selectedIndexes();
    for (int i = 0; i < modelSelected.count(); ++i) {
        // check that neither the parents nor the index is hidden before we add
        QModelIndex index = modelSelected.at(i);
        while (index.isValid() && !isIndexHidden(index))
            index = index.parent();
        if (index.isValid())
            continue;
        viewSelected.append(modelSelected.at(i));
    }
    return viewSelected;
}

/*!
  Scrolls the contents of the tree view by (\a dx, \a dy).
*/
void QTreeView::scrollContentsBy(int dx, int dy)
{
    Q_D(QTreeView);

    dx = isRightToLeft() ? -dx : dx;

    if (dx)
        d->header->setOffset(horizontalScrollBar()->value());

    if (d->viewItems.isEmpty())
        return;

    // guestimate the number of items in the viewport
    int viewCount = d->viewport->height() / d->itemHeight;
    int maxDeltaY = verticalStepsPerItem() * qMin(d->viewItems.count(), viewCount);

    // no need to do a lot of work if we are going to redraw the whole thing anyway
    if (qAbs(dy) > qAbs(maxDeltaY) && d->editors.isEmpty()) {
        verticalScrollBar()->repaint();
        d->viewport->update();
        return;
    }

    if (dy) {
        int steps = verticalStepsPerItem();
        int currentScrollbarValue = verticalScrollBar()->value();
        int previousScrollbarValue = currentScrollbarValue + dy; // -(-dy)
        int currentViewIndex = currentScrollbarValue / steps; // the first visible item
        int previousViewIndex = previousScrollbarValue / steps;

        const QVector<QTreeViewItem> viewItems = d->viewItems;

        int currentY = d->topItemDelta(currentScrollbarValue, d->height(currentViewIndex));
        int previousY = currentY;
        if ((previousViewIndex >= 0) && (previousViewIndex < d->viewItems.size()))
            previousY = d->topItemDelta(previousScrollbarValue, d->height(previousViewIndex));

        dy = currentY - previousY;
        if (previousViewIndex < currentViewIndex) { // scrolling down
            for (int i = previousViewIndex; i < currentViewIndex; ++i)
                dy -= d->height(i);
        } else if (previousViewIndex > currentViewIndex) { // scrolling up
            for (int i = previousViewIndex - 1; i >= currentViewIndex; --i)
                dy += d->height(i);
        }
    }

    d->scrollContentsBy(dx, dy);
}

/*!
  This slot is called whenever a column has been moved.
*/
void QTreeView::columnMoved()
{
    QAbstractItemView::dataChanged(QModelIndex(), QModelIndex());
}

/*!
  \internal
*/
void QTreeView::reexpand()
{
    // do nothing
}

/*!
  Informs the view that the rows from the \a start row to the \a end row
  inclusive have been inserted into the \a parent model item.
*/
void QTreeView::rowsInserted(const QModelIndex &parent, int start, int end)
{
    Q_D(QTreeView);
    d->doDelayedItemsLayout();
    QAbstractItemView::rowsInserted(parent, start, end);
}

/*!
  Informs the view that the rows from the \a start row to the \a end row
  inclusive are about to removed from the given \a parent model item.
*/
void QTreeView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
{
    Q_D(QTreeView);
    if (d->viewItems.isEmpty())
        return;

    setState(CollapsingState);

    if (parent == rootIndex()) {
        d->viewItems.clear();
        d->doDelayedItemsLayout();
        return;
    }

    // collapse the parent
    bool expanded = isExpanded(parent);
    d->expandParent.push(expanded);
    if (expanded) {
        int p = d->viewIndex(parent);
        if (p != -1)
            d->collapse(p, false);
    }

    QAbstractItemView::rowsAboutToBeRemoved(parent, start, end);
}

/*!
    \since 4.1

    Informs the view that the rows from the \a start row to the \a end row
    inclusive have been removed from the given \a parent model item.
*/
void QTreeView::rowsRemoved(const QModelIndex &parent, int start, int end)
{
    Q_UNUSED(start);
    Q_UNUSED(end);
    Q_D(QTreeView);

    if (d->viewItems.isEmpty())
        return;

    if (parent == rootIndex()) {
        d->viewItems.clear();
        d->doDelayedItemsLayout();
        return;
    }

    bool expanded = d->expandParent.pop();
    if (expanded) {
        int p = d->viewIndex(parent);
        if (p != -1) { // item is visible
            d->expand(p, false);
            d->viewport->update();
        } else if (!d->expandedIndexes.contains(parent)) {
            d->expandedIndexes.append(parent);
        }
    }

    setState(NoState);
    d->updateScrollbars();
}

/*!
  Informs the tree view that the number of columns in the tree view has
  changed from \a oldCount to \a newCount.
*/
void QTreeView::columnCountChanged(int, int)
{
    if (isVisible())
        updateGeometries();
	viewport()->update();
}

/*!
  Resizes the \a column given to the size of its contents.
*/
void QTreeView::resizeColumnToContents(int column)
{
    Q_D(QTreeView);
    d->executePostedLayout();
    if (column < 0 || column >= d->header->count())
        return;
    int contents = sizeHintForColumn(column);
    int header = d->header->isHidden() ? 0 : d->header->sectionSizeHint(column);
    d->header->resizeSection(column, qMax(contents, header));
}

/*!
  Sorts the model by the values in the given \a column.
 */
void QTreeView::sortByColumn(int column)
{
    Q_D(QTreeView);
    if (!d->model)
        return;
    bool ascending = (header()->sortIndicatorSection() == column
                      && header()->sortIndicatorOrder() == Qt::DescendingOrder);
    Qt::SortOrder order = ascending ? Qt::AscendingOrder : Qt::DescendingOrder;
    header()->setSortIndicator(column, order);
    d->model->sort(column, order);
}

/*!
    Selects all the items in the underlying model.
*/
void QTreeView::selectAll()
{
    Q_D(QTreeView);
    if (!selectionModel())
        return;
    d->select(0, d->viewItems.count() - 1,
              QItemSelectionModel::ClearAndSelect
              |QItemSelectionModel::Rows);
}

/*!
    This function is called whenever \a{column}'s size is changed in
    the header. \a oldSize and \a newSize give the previous size and
    the new size in pixels.
*/
void QTreeView::columnResized(int column, int /* oldSize */, int /* newSize */)
{
    Q_D(QTreeView);
    d->columnsToUpdate.append(column);
    if (d->columnResizeTimerID == 0)
        d->columnResizeTimerID = startTimer(0);
}

/*!
  Updates the items in the tree view.
  \internal
*/
void QTreeView::updateGeometries()
{
    Q_D(QTreeView);
    QSize hint = d->header->isHidden() ? QSize(0, 0) : d->header->sizeHint();
    setViewportMargins(0, hint.height(), 0, 0);

    QRect vg = d->viewport->geometry();
    QRect geometryRect(vg.left(), vg.top() - hint.height(), vg.width(), hint.height());
    d->header->setGeometry(geometryRect);
    d->header->setOffset(horizontalScrollBar()->value());
    if (d->header->isHidden())
        QMetaObject::invokeMethod(d->header, "updateGeometries");
    d->updateScrollbars();

    QAbstractItemView::updateGeometries();
}

/*!
  Returns the size hint for the \a column's width or -1 if there is no
  model.

  If you need to set the width of a given column to a fixed value, call
  QHeaderView::resizeSection() on the view's header.

  If you reimplement this function in a subclass, note that the value you
  return is only used when resizeColumnToContents() is called. In that case,
  if a larger column width is required by either the view's header or
  the item delegate, that width will be used instead.

  \sa QWidget::sizeHint, header()
*/
int QTreeView::sizeHintForColumn(int column) const
{
    Q_D(const QTreeView);
    if (d->viewItems.isEmpty())
        return -1;
    int w = 0;
    QStyleOptionViewItem option = viewOptions();
    QAbstractItemDelegate *delegate = itemDelegate();
    const QVector<QTreeViewItem> viewItems = d->viewItems;
    for (int i = 0; i < viewItems.count(); ++i) {
        QModelIndex index = viewItems.at(i).index;
        if (index.column() != column)
            index = index.sibling(index.row(), column);
        int width = delegate->sizeHint(option, index).width();
        w = qMax(w, width + (column == 0 ? d->indentation(i) : 0));
    }
    return w;
}

/*!
  Returns the size hint for the row indicated by \a index.

  \sa sizeHintForColumn(), uniformRowHeights()
*/
int QTreeView::indexRowSizeHint(const QModelIndex &index) const
{
    Q_D(const QTreeView);
    if (!index.isValid() || !model())
        return -1;

    int start = -1;
    int end = -1;
    int count = d->header->count();
    if (count) {
        // If the sections have moved, we end up checking too many or too few
        start = d->header->logicalIndexAt(0);
        end = d->header->logicalIndexAt(viewport()->width());
    } else {
        // If the header has not been layed out yet, we use the model directly
        count = model()->columnCount(index.parent());
    }

    if (isRightToLeft()) {
        start = (start == -1 ? count - 1 : start);
        end = (end == -1 ? 0 : end);
    } else {
        start = (start == -1 ? 0 : start);
        end = (end == -1 ? count - 1 : end);
    }

    int tmp = start;
    start = qMin(start, end);
    end = qMax(tmp, end);

    int height = -1;
    QStyleOptionViewItem option = viewOptions();
    // This is temporary hack to speed up the function and will go away in 4.2
    option.rect.setWidth(-1);
    QAbstractItemDelegate *delegate = itemDelegate();
    for (int column = start; column <= end; ++column) {
        QModelIndex idx = index.sibling(index.row(), column);
        if (idx.isValid()) {
            if (QWidget *editor = d->editorForIndex(idx))
                height = qMax(height, editor->size().height());
            height = qMax(height, delegate->sizeHint(option, idx).height());