Disable keyboard input for spinbox entry

[babygal]

QSpinBox *spinBox ;
 spinBox = new QSpinBox;

QSpinBox *spinBox ;
 spinBox = new QSpinBox;

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There is no setValidator for QSpinBox like as for QLineEdit.
I want to restrict the user's input to clicking up and down arrows only,
and not allow user to type a value into the spin box's line editor.
How to do ?


S.O.S

[saa7_go]

You can subclass QSpinBox, and reimplement keyPressEvent(QKeyEvent *event).
Use QKeyEvent::ignore() to ignore the event.

[aamer4yu]

Or alternatively you can use event filters

[babygal]

I'm not really clear on how to do it exactly? where can i get help or some sample code?

[babygal]

You can subclass QSpinBox, and reimplement keyPressEvent(QKeyEvent *event).
Use QKeyEvent::ignore() to ignore the event.

Hi.What is subclass QSpinBox and how to do it exactly?
Thank you.

[saa7_go]

Hi.What is subclass QSpinBox and how to do it exactly?

You create a new class based on QSpinBox. For example:

#include <QSpinBox>
#include <QKeyEvent>
 
class SpinBox : public QSpinBox
{
public:
    SpinBox(QWidget *parent = 0) : QSpinBox(parent) { }
 
protected:
    // reimplement keyPressEvent
    void keyPressEvent(QKeyEvent *event)
    {
          event->ignore();
    }
};

#include <QSpinBox>
#include <QKeyEvent>

class SpinBox : public QSpinBox
{
public:
    SpinBox(QWidget *parent = 0) : QSpinBox(parent) { }
    
protected:
    // reimplement keyPressEvent
    void keyPressEvent(QKeyEvent *event)
    {
          event->ignore();
    }
};

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[babygal]

You create a new class based on QSpinBox. For example:

#include <QSpinBox>
#include <QKeyEvent>
 
class SpinBox : public QSpinBox
{
public:
    SpinBox(QWidget *parent = 0) : QSpinBox(parent) { }
 
protected:
    // reimplement keyPressEvent
    void keyPressEvent(QKeyEvent *event)
    {
          event->ignore();
    }
};

#include <QSpinBox>
#include <QKeyEvent>

class SpinBox : public QSpinBox
{
public:
    SpinBox(QWidget *parent = 0) : QSpinBox(parent) { }
    
protected:
    // reimplement keyPressEvent
    void keyPressEvent(QKeyEvent *event)
    {
          event->ignore();
    }
};

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I just implemented as above and it works!.. Yaayy...Thanks a million!

[Judge Gazza]

I realize this is an old thread, but another option is to make the QLineEdit with in the spin box read only.

class tcNoEditSpinBox : public QSpinBox
{
    Q_OBJECT
public:
    tcNoEditSpinBox (QWidget *parent) : QSpinBox (parent)
    {  lineEdit()->setReadOnly (true); }
};
 
class tcNoEditDoubleSpinBox : public QDoubleSpinBox
{
    Q_OBJECT
public:
    tcNoEditDoubleSpinBox (QWidget *parent) : QDoubleSpinBox (parent)
    {  lineEdit()->setReadOnly (true); }
};

class tcNoEditSpinBox : public QSpinBox
{
    Q_OBJECT
public:
    tcNoEditSpinBox (QWidget *parent) : QSpinBox (parent)
    {  lineEdit()->setReadOnly (true); }
};

class tcNoEditDoubleSpinBox : public QDoubleSpinBox
{
    Q_OBJECT
public:
    tcNoEditDoubleSpinBox (QWidget *parent) : QDoubleSpinBox (parent)
    {  lineEdit()->setReadOnly (true); }
};

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[d_stranz]

Subclassing is unnecessary. QAbstractSpinBox, from which other spin box classes are derived, has a QAbstractSpinBox::setReadOnly() method which accomplishes what the OP wanted.