Set the sizes of the view container parts according to the given weights
by moving the split handles. This is similar to setRelativeSizes
defined
in SplitLayout
, but here we properly consider the collapsed / expanded state.
Sinusoidal tween function for smooth animation.
Update a view container part that has been collapsed or expanded. The transition to the new state is animated.
Determine the size of the split panel area that is available for widget content, i.e. excluding part headers and split handles.