drawControl not being called for custom styled elements

ateek.ujjawal

So, when using a custom style for my QScrollBar for control elements, the drawControl function does not seem to get called ever. Is there any specific condition when this function is called?

Christian Ehrlicher

CC_ScrollBar is, as you can see a complex control so if you want to handle CC_ScrollBar you should override drawComplexControl()

ateek.ujjawal

@Christian-Ehrlicher I tried overriding that function as well, but it does not get called.

Also if I wanted to draw separate elements, like the add page and sub page of the scrollbar, how would it be possible with the drawControl/drawComplexControl?

Christian Ehrlicher

Override those functions and reimplement what you want.
You should also make sure that you really use your style.

ateek.ujjawal

@Christian-Ehrlicher Tried doing that, neither the drawControl or drawComplexControl get called. What might I be doing wrong?

Christian Ehrlicher

@ateek-ujjawal said in drawControl not being called for custom styled elements:

What might I be doing wrong?

You are not using your style as I already told you.

ateek.ujjawal

@Christian-Ehrlicher Is this not the correct way of doing it?

  _ui.slicingScrollBar->setStyle(new CustomStyle);

The slicingScrollBar is a QScrollBar. The CustomStyle is defined as follows:

class CustomStyle : public QProxyStyle {
  Q_OBJECT

 public:
  CustomStyle();
  ~CustomStyle() {};

  void drawPrimitive(PrimitiveElement pe, const QStyleOption* opt, QPainter* p,
                     const QWidget* widget) const override;

  void drawControl(ControlElement ce, const QStyleOption* opt, QPainter* p,
                   const QWidget* w = nullptr) const override;

  void drawComplexControl(ComplexControl cc, const QStyleOptionComplex* opt,
                          QPainter* p,
                          const QWidget* widget = nullptr) const override;
};

SGaist

Hi,

What if you set it on QApplication ?

ateek.ujjawal

@SGaist Still the same result.

Christian Ehrlicher

Start from the example in https://doc.qt.io/qt-6/qproxystyle.html#details and see what happens.

ateek.ujjawal

@Christian-Ehrlicher Uh, I don't see how overriding the style hint would help. I searched the QStyle enum for options I needed and I came up with nothing useful.

Christian Ehrlicher

You should start with this example to see if it works and then add your function to find out what is going wrong...