CODEWITHSUNDEEP
qtopenglrenderingqglwidget
Nomis Raserf
Nomis Raserf

Reputation: 123

When is QGLWidget's paintGL called?

All I can find is "whenever the widget needs to be painted."

When is that, specifically?

Upvotes: 10

Views: 10943

Answers (1)

peppe
peppe

Reputation: 22826

When you call updateGL() on your widget (or update()), or just Qt decides to redraw your widget. Reasons why Qt might choose to ask for a redraw include:

  • your widget gets resized
  • your widget is hidden and shown again
  • your widget is minimized and then restored
  • something else is put in front of your widget and then moved away
  • the Moon is in the third quarter
  • a distant butterfly had flapped its wings
  • ...

In short, you have very little control about when Qt asks for a repaint. Just be sure to paint fast! :-)

Upvotes: 19

Related Questions