Disable Tab Key

Somebody knows how to disable the tab key. I need to disable the use of tab key to move between fileds.

Thanks for your help

Code:

---

void MyWidget::keyPressEvent(QKeyEvent *e)
{
 if(e->key()==Qt::Key_Tab)
 {
   e->accept();
  //do somthing if you want
 }
 else e->reject();
 
}

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I have this error with your code:

error: ‘class QKeyEvent’ has no member named ‘reject’

I am using QT 3.3.6

You can try turn of TabFocus for each fields.

For example:
If you have one QPushButton and one QLineEdit in your window. You can try

mMyBtn->setFocusPolicy(QWidget::NoFocus);
mMyEdit->setFocusPolicy(QWidget::NoFocus);

Quote:

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Originally Posted by otortos

I have this error with your code:

error: ‘class QKeyEvent’ has no member named ‘reject’

I am using QT 3.3.6

---

Sorry, it should be e->ingnore();

This is my code:

void Form1::keyPressEvent(QKeyEvent *e)
{
if(e->key()==Qt::Key_Tab)
{
e->ignore();
}
else
{
e->ignore();
}
}

and, when i press "tab" still move to the next field.

This approach is wrong. The key press event goes directly to a focused child.

You could prevent the child from getting tab key press events by an event filter, but in my opinion that wouldn't be very good idea. I don't know what kind of widgets do you have, but some widgets have an "internal navigation" etc. with tab key. E.g. a date and time edit, which first changes the current field, and then after the last field changes the focus.

Code:

---

// install event filter for all widgets, e.g. in "MyWidget" constructor
QList<QWidget*> widgets = findChildren<QWidget*>();
foreach (QWidget* widget, widgets)
	widget->installEventFilter(this);

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Code:

---

bool MyWidget::eventFilter(QObject* o, QEvent* e)
{
	if (e->type() == QEvent::KeyPress)
	{
		QKeyEvent* k = static_cast<QKeyEvent*>(e);
		if (k->key() == Qt::Key_Tab)
		{
			// filter tab out
			return true;
		}
	}
	return false;
}

---

A better solution could be to trick the tab order. By this way you wouldn't prevent widgets from receiving and acting due to tab key press events.

Code:

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QList<QWidget*> widgets = findChildren<QWidget*>();
foreach (QWidget* widget, widgets)
	widget->setTabOrder(widget, widget);

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