CODEWITHSUNDEEP
c++qtqcompleterqstyleditemdelegate
thibsc
thibsc

Reputation: 4059

How to popup QCompleter on entering cell editing in QTableWidget

I have a QTableWidget with custom QStyledItemDelegate and when enter in cell editing, I want to popup a completer but it doesn't appear.

The setup of delegate:

tableWidget.setItemDelegate(new DelegateLineEdit());

My custom class:

class DelegateLineEdit : public QStyledItemDelegate
{
public:
    DelegateLineEdit() {
        signs << "<" << "<=" << ">" << ">=" << "=";
    }
    ~DelegateLineEdit(){ }
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {
        QLineEdit *line_edit = new QLineEdit(parent);
        line_edit->setStyle(parent->style());
        line_edit->setFocusPolicy(Qt::StrongFocus);
        QCompleter *completer = new QCompleter(signs, line_edit);
        completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
        line_edit->setCompleter(completer);
        return line_edit;
    }
    void setEditorData(QWidget *editor, const QModelIndex &index) const {
        QStyledItemDelegate::setEditorData(editor, index);
        QLineEdit *line_edit = dynamic_cast<QLineEdit*>(editor);
        if (line_edit){
            line_edit->completer()->complete();
        }
    }

private:
    QStringList signs;

};

When I enter in cell editing by double click, nothing happen but if I comment the line
line_edit->completer()->complete(), I can edit the cell but no completion is show. Somebody have an idea ?

Upvotes: 1

Views: 1785

Answers (2)

p-a-o-l-o
p-a-o-l-o

Reputation: 10057

I would try using a QLineEdit subclass as editor, where the focusInEvent is overridden to show the popup:

class LineEdit : public QLineEdit
{
public:
  explicit LineEdit(QWidget*parent) : QLineEdit(parent){}
protected:
  void focusInEvent(QFocusEvent * e)
  {
    QLineEdit::focusInEvent(e);
    completer()->complete();
  }
};

The delegate becomes:

class DelegateLineEdit : public QStyledItemDelegate
{
public:
    DelegateLineEdit() {
        signs << "<" << "<=" << ">" << ">=" << "=";
    }
    ~DelegateLineEdit(){ }
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {

//use the subclass instead of QLineEdit:
        LineEdit *line_edit = new LineEdit(parent);

        line_edit->setStyle(parent->style());
        line_edit->setFocusPolicy(Qt::StrongFocus);
        QCompleter *completer = new QCompleter(signs, line_edit);
        completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
        line_edit->setCompleter(completer);
        return line_edit;
    }

private:
    QStringList signs;

};

Upvotes: 1

athar atef
athar atef

Reputation: 1

I think something like completer->popup()->show(); should do what you want or try to call like

QCompleter::setCompletionPrefix(index.data(Qt::EditRole).tostring());

and

QCompleter::complete();

Upvotes: 0

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