since: 4.8


enum Gdk.ScrollUnit

Description [src]

Specifies the unit of scroll deltas.

When you get GDK_SCROLL_UNIT_WHEEL, a delta of 1.0 means 1 wheel detent click in the south direction, 2.0 means 2 wheel detent clicks in the south direction… This is the same logic for negative values but in the north direction.

If you get GDK_SCROLL_UNIT_SURFACE, are managing a scrollable view and get a value of 123, you have to scroll 123 surface logical pixels right if it’s delta_x or down if it’s delta_y. This is the same logic for negative values but you have to scroll left instead of right if it’s delta_x and up instead of down if it’s delta_y.

1 surface logical pixel is equal to 1 real screen pixel multiplied by the final scale factor of your graphical interface (the product of the desktop scale factor and eventually a custom scale factor in your app).

Available since: 4.8



The delta is in number of wheel clicks.

  • Value: 0
  • Available since: 4.8

The delta is in surface pixels to scroll directly on screen.

  • Value: 1
  • Available since: 4.8