Pull to collapse

ExpandablePageLayout is nested scrolling aware. Its pull-to-collapse gesture will work seamlessly with your scrollable content as long as you use widgets that support nested scrolling such as NestedScrollView, RecyclerView, etc.

Intercept gesture

In case nested scrolling isn’t supported by your layout, the pull-to-collapse gesture can be intercepted manually:

expandablePage.pullToCollapseInterceptor = { downX, downY, upwardPull ->
  val directionInt = if (upwardPull) +1 else -1
  val canScrollFurther = scrollableContainer.canScrollVertically(directionInt)
  if (canScrollFurther) InterceptResult.INTERCEPTED else InterceptResult.IGNORED
}

When the scrollable content does not consume the entire space, the downX and downY parameters can be used to check if the touch actually lies on them.

Collapse threshold

When the content is pulled and released, ExpandablePageLayout uses the default toolbar height as the threshold to decide if the content can be collapsed. This can be customised using,

expandablePage.pullToCollapseThresholdDistance = THRESHOLD_IN_PIXELS