Marcus Nilsson eec411c508 LibGUI: Add a AutoScroll timer to AbstractScrollableWidget ...

This commit adds a timer to AbstractScrollableWidget that can be used
when implementing automatic scrolling. By overriding
on_automatic_scrolling_timer_fired() we can calculate the scrolling
delta when dragging objects, and redraw as needed. A helper function,
automatic_scroll_delta_from_position() gives us a delta that
we can use to calculate speed and direction. By default
m_autoscroll_threshold is 20 pixels from the edge, and gives a linear
change in scroll delta.

2021-09-16 22:29:21 +02:00

10 KiB

Raw Blame History

View Raw