[Solved] My overloaded QStyledItemDelegate::sizeHint is not called

augiekim

I have a subclass of QStyledItemDelegate and paint() method is called correctly but the method sizeHint()is not called at all.

Did I miss something?

Declaration of the class is,

@class MyItemDelegate: public QStyledItemDelegate
{
Q_OBJECT
public:
MyItemDelegate(QObject * parent = 0);
virtual ~MyItemDelegate();

virtual void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const;
virtual QSize sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const ;

};
@

Creation of model, proxy and itemDelegate

@
table = new MyTableModel(tableView);

tableView->setShowGrid(false);
tableView->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);

tableView->horizontalHeader()->setStretchLastSection(true);
tableView->verticalHeader()->hide();
tableView->horizontalHeader()->hide();

tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
tableView->setSelectionMode(QAbstractItemView::SingleSelection);
tableView->setSelectionBehavior(QAbstractItemView::SelectRows);

proxyModel = new QSortFilterProxyModel(tableView);
proxyModel->setSourceModel(table);
proxyModel->setDynamicSortFilter(true);

tableView->setModel(proxyModel);
item = new MyItemDelegate(tableView);
tableView->setItemDelegate(item);

@

augiekim

I downloaded Qt source codes and looked into QTableView.cpp then figured out that QStyledItemDelegate::sizeHint is called only when QTableView::resizeRowsToContents, QTableView::resizeRowToContents, QTableView::resizeColumnsToContents and QTableView::resizeColumnToContents are called.

So I changed my code to call resizeRowToContents each time after a new row is added. Now, all my codes is working fine.

giesbert

you can also use the header view to do it automatically:

@
QHeaderView* headerView = tableView->horizontalHeader();
headerView->setResizeMode(QHeaderView::ResizeToContents);
@

and the same for the vertical header. Then ropws and columns are automatically resized.

augiekim

Thank you for the useful information.

I've just applied it to my code.

[quote author="Gerolf" date="1304920972"]you can also use the header view to do it automatically:

@
QHeaderView* headerView = tableView->horizontalHeader();
headerView->setResizeMode(QHeaderView::ResizeToContents);
@

and the same for the vertical header. Then ropws and columns are automatically resized.[/quote]