resizing row's height in QTreeWidget/QTreeView

Question

Hi everyone,

I have some problems with sizing row's height in QTreeWidget. I use QStyledItemDelegate with QPlainTextEdit. During editing text in QPlainTextEdit i check for changes with a help of:

rect = self.blockBoundingRect(self.firstVisibleBlock())

and if text's height changes i resize editor size and need row in QTreeWidget also resizing. But i don't know how to inform TreeWidget or a Delegate about changes. I tried to initialize editor with index, that i could use in a future, but Delegate creates new editor every time and i failed to use signals. Also I used following function to catch resize event, but it' doesn't:

bool QAbstractItemDelegate::editorEvent ( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index )

How can i bound editor's size changes with TreeWidget?

And one more thing, by default all items (cells) in TreeWidget have -1 or some big value as default width. I need whole text in cell to be visible, so how can i limit cells width only by visible range and make it expand in height? I want for it the same behavior as in instance a table in MSWord.

Thank you in advance, Serge

Answer 1

I believe you would have to notify model about the data change without closing editor, this should force treeview to recalculate its row height according to the new content of the field it's showing. What you could do is override eventFilter method in your delegate and try to emit commitData signal on key press; smth like this:

bool YourStyledItemDelegate::eventFilter(QObject* object, QEvent* event)
{
    bool result = QStyledItemDelegate::eventFilter(object, event);
    QWidget* editor = qobject_cast<QWidget*>(object);
    if (editor)
    {
        if (event->type() == QEvent::KeyPress)
        {
            emit commitData(editor); //<- this should force row to recalculate its size
        }
    }
    return result;
}

hope this would give you an idea on how to proceed, regars