Reversing the arrows in a QSpinBox

How can I "flip" the arrows in a QSpinBox so that when you push down, the number increases and when you push up, the number decreases?

I want to use the spinbox to set depth-value so my users found it more intuitive that down would be an increase of depth.

I have subclassed the QSpinBox (actually a QDoubleSpinBox) and overridden the wheelEvent so that one is taken care of.

I could look for mousepress and see if the mouse is inside the up or down arrow, maybe, but when the value is 0 (minValue), the down-arrow is gray, so just overriding the values here would not be any good. I want the up-arrow to be gray when value is at minValue.

I've tried googling for this and the closest I've come is to completely redefine the QStyle painting routine. I found this also in "C++ GUI programming with Qt 4". This seemed overly complex and I don't want to redefine the style if this means that I would set the spinBox style to something that may be unlike the native look in different OS'es.

Is there any painting routine I could relatively easily override where I just reposition the arrows? Or any other place I should look?

Reimplement QAbstractSpinBox::stepBy() :

Code:

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void MySpinbox::stepBy(int step) {
  QSpinBox::stepBy(-step);
}

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Thanks, but it did not work for the extreme values. When the value is 0.0, the step-function is prevented. I will look more into this. Also the problem with the gray arrow was still there

Let's try something else then. Reimplement valueFromText and textFromValue to work on negative numbers and set your maximum as 0 and your minimum as -something. Then other things should work properly.

Code:

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double MySpinbox::valueFromText(const QString &text) const { return -QDoubleSpinBox::valueFromText(text); }
QString MySpinbox::textFromValue(double value) const { return QDoubleSpinBox::textFromValue(-value); }

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This seems to fix it for the textFromValue-part, but it looks like the validator prevents the input of positive numbers when I have a range of [-45.0, 0.0]

I will look into that. I'm much closer to this working now than a few hours ago. Thanks!

You can reimplement validate() for that.

I also subclassed QDoubleSpinBox to override the scrolling function.