How to mark the whole text by double clicking for QDoubleSpinBox?

Question

I have a class which inherit from QDoubleSpinBox.

 class NumericEdit : public QDoubleSpinBox
 {      
 public:
   NumericEdit( QWidget *p_parent = nullptr );

 protected:
   bool event( QEvent *p_event ) override;
   void keyPressEvent( QKeyEvent *p_event ) override;
   void keyReleaseEvent( QKeyEvent *p_event ) override;
   void focusInEvent( QFocusEvent *p_event ) override;
   void focusOutEvent( QFocusEvent *p_event ) override;
   ............
 };

 NumericEdit::NumericEdit( QWidget *p_parent ) : QDoubleSpinBox( p_parent )
 {
   initStyleSheet();
   setButtonSymbols( QAbstractSpinBox::NoButtons );
   setGroupSeparatorShown( true );
   ..........
 }

The result when I double click into the editing field is like this, only the part in between group separators is marked. If I triple click, the whole text is then marked.

How should I change, sothat when I double click into the editing field (no matter in integer part or decimal part), the whole text is marked?

I think this is normal behaviour. If you want it to behave the way you want, you have to override mouseDoubleClickEvent — George, Jun 04 '19 at 08:08
@George: I thought about that already. But what should be in the function `mouseDoubleClickEvent`, i still do not know — songvan, Jun 04 '19 at 08:46

score 4 · Accepted Answer · answered Jun 04 '19 at 08:50

4

Solution is reimplementing of QLineEdit::mouseDoubleClickEvent method (not QDoubleSpinBox::mouseDoubleClickEvent).

Custom line edit:

class ExtendedLineEdit : public QLineEdit
{
    Q_OBJECT
public:
    explicit ExtendedLineEdit(QWidget *parent = nullptr);
protected:
    void mouseDoubleClickEvent(QMouseEvent *event);
}

void ExtendedLineEdit::mouseDoubleClickEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        selectAll();
        event->accept();
        return;
    }

    QLineEdit::mouseDoubleClickEvent(event);
}

And then set it to your custom spin box

NumericEdit::NumericEdit(QWidget *p_parent) : QDoubleSpinBox(p_parent)
{
    //...
    ExtendedLineEdit* lineEdit = new ExtendedLineEdit(this);
    setLineEdit(lineEdit);
}

answered Jun 04 '19 at 08:50

Serhiy Kulish

1,057
1
6
8

I have one more question. Why do we override `mouseDoubleClickEvent` of QLineEdit, not QDoubleSpinBox? – songvan Jun 04 '19 at 08:58
3

@songvan Because internal `QLineEdit` of `QDoubleSpinBox` accept event before it rich `QDoubleSpinBox`. So if you reimplement `QDoubleSpinBox::mouseDoubleClickEvent` you can catch this event only on double clicking on arrows (up/down) not in internal line edit. Also `QLineEdit::mouseDoubleClickEvent` can avoid double clicking on uneditable parts of `QDoubleSpinBox` (like buttons, borders, background etc). – Serhiy Kulish Jun 04 '19 at 09:43

How to mark the whole text by double clicking for QDoubleSpinBox?

1 Answers1