QTableWidget with automatic restore of old cell value

Question

I'm just getting started with QT, so please exercise a little patience... I've an editable QTableWidget (actually a subclassing), and need to implement the following behavior. When the user types a non acceptable value I would like: 1) to restore the original value; 2) to keep the focus in the cell and set it in edit mode.

I'm currently using the itemChanged SIGNAL, and a subclassing of QTableWidgetItem. Which one is the best way to get what I need? Any tip, suggestion or reference is really welcome.

If you think it as useful I can post some code.

Ciao Alf.

Possible duplicate of [How to use a validator with QTableWidgetItem?](http://stackoverflow.com/questions/18309715/how-to-use-a-validator-with-qtablewidgetitem) — Aurel Branzeanu, Jan 12 '16 at 22:18

score 0 · Answer 1 · answered Jan 12 '16 at 20:04

0

I'm currently using the itemChanged SIGNAL...

You should subclass QStyledItemDelegate

class CustomTableDelegate : public QStyledItemDelegate
{
    Q_OBJECT

    public:
        CustomTableDelegate (QObject * parent = 0);
        QWidget * createEditor (QWidget *, const QStyleOptionViewItem &, const QModelIndex &) const;
        bool editorEvent (QEvent *, QAbstractItemModel *, const QStyleOptionViewItem &, const QModelIndex &);
        void setEditorData (QWidget *, const QModelIndex &) const;
        void setModelData  (QWidget *, QAbstractItemModel *, const QModelIndex &) const;
};

And implement validation inside setModelData.

To use custom delegate you need set it for your QTableWidget:

table->setItemDelegate (new CustomTableDelegate () );

answered Jan 12 '16 at 20:04

Gluttton

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Can I do that with a single column using setItemDelegateForColumn? – Alfredo Jan 12 '16 at 20:20
No, you can’t. To check value for specific column you should check column number inside `setModelData` something like: `switch (index.column () ) {\\do stuff...}`. – Gluttton Jan 12 '16 at 20:23
Ok. I'll do that. Thanks & Ciao – Alfredo Jan 12 '16 at 21:09

QTableWidget with automatic restore of old cell value

1 Answers1