qtableview text edit - qt

Question

I'm writing a program with PyQt. I use QTableView to display data.
The problem is when I trigger the edit(for example press F2) of a cell, the text in the cell is all selected(highlighted) by default. It's not convenience because I want to modify the text but not rewrite them all.
So I want to know if there is any function to change the behavior?
Thank you

Answer 1

Not sure if there is a simpler way, but you can write your own item delegate which creates a QLineEdit. When updating the editor with model's data you deselect the text and possibly move the cursor to the beginning. The delegate would be something like this (I don't have a Qt installation available right now so I can't test it, but the idea should work):
QWidget * MyDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem & option,
const QModelIndex & index) const
{
// Just creates a plain line edit.
QLineEdit *editor = new QLineEdit(parent);
return editor;
}
void MyDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const
{
// Fetch current data from model.
QString value = index.model()->data(index, Qt::EditRole).toString();
// Set line edit text to current data.
QLineEdit * lineEdit = static_cast<QLineEdit*>(editor);
lineEdit->setText(value);
// Deselect text.
lineEdit->deselect();
// Move the cursor to the beginning.
lineEdit->setCursorPosition(0);
}
void MyDelegate::setModelData(QWidget *editor,
QAbstractItemModel *model,
const QModelIndex &index) const
{
// Set the model data with the text in line edit.
QLineEdit * lineEdit = static_cast<QLineEdit*>(editor);
QString value = lineEdit.text();
model->setData(index, value, Qt::EditRole);
}
If you haven't used delegates before in Qt documentation there is a useful example.

Answer 2

You'll need to implement a delegate so you can override the widget used for edits to that field to use a custom editor widget.
The QTableView will use a QTextEdit by default and you could try sub-classing that and altering it's behaviour. My best guess would be that you need to manipulate the focus policy on the editor widget, possibly focusInEvent[1], to change it's behaviour when it receives focus.
[1] http://doc.qt.nokia.com/4.7/qwidget.html#focusInEvent