[Qt-interest] Customizing QSpinBox in Qt4

[Malyushytsky, Alex]

>> This works. What I dislike is, that I have to subclass the spin box to change something I consider to be a property.

Why do you dislike an idea of subclassing?
The only thing came to my mind it was inconvenience of using QDesigner with subclasses in Qt3
(creating and managing addons added extra complexity) .
Qt4 added "Promoting Widgets" feature which fixed that problem.

Regards,
   Alex



-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Lars Amsel
Sent: Sunday, June 28, 2009 11:24 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] Customizing QSpinBox in Qt4

Hi,

I want to customize the behaviour of QSpinBox. When the user enters a
number directly, numbers outside the range of QSpinBox should be
allowed. They should be truncated to min/max value, when the edit submits.

I managed to do this with this class:

class TolerantSpinBox : public QSpinBox {
public:
   TolerantSpinBox(QWidget* parent = NULL);
protected:
   virtual QValidator::State validate(QString& input, int& pos) const;
   virtual void fixup(QString& input) const;
;

TolerantSpinBox::TolerantSpinBox(QWidget* parent) : QSpinBox(parent) {
}

QValidator::State TolerantSpinBox::validate(QString& input, int& pos)
const {
   QValidator::State result = QSpinBox::validate(input, pos);
   if (result == QValidator::Invalid) {
     bool ok = false;
     input.toInt(&ok, 10);
     if (ok) {
       result = QValidator::Intermediate;
     }
   }
   return result;
}

void TolerantSpinBox::fixup(QString& input) const {
   bool ok;
   int value = input.toInt(&ok, 10);
   if (ok) {
     value = qMin(qMax(value, minimum()), maximum());
     input = QString::number(value);
   } else {
     QSpinBox::fixup(input);
   }
}

This works. What I dislike is, that I have to subclass the spin box to
change something I consider to be a property. In previous versions of Qt
(3.x AFAIK) there was a setValidator-method, which offered the same
functionality. This method seems to be gone with Qt4. Is there a way to
get the desired behaviour without subclassing QSpinBox?

thanks

Lars
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