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page_callbacks.md

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Page callbacks

ExpandablePageLayout has four different states.

  • PageState.COLLAPSING
  • PageState.COLLAPSED
  • PageState.EXPANDING
  • PageState.EXPANDED

These can be accessed using ExpandablePage#currentState or by registering callbacks,

expandablePage.addStateChangeCallbacks(object: SimplePageStateChangeCallbacks() {
  override fun onPageAboutToExpand(expandAnimDuration: Long) {
  override fun onPageExpanded() {}
  override fun onPageAboutToCollapse(collapseAnimDuration: Long) {}
  override fun onPageCollapsed() {}
})

Overridable functions

ExpandablePageLayout offers the same set of callbacks as open functions that can be overridden when subclassed. This can also be useful for apps that use a View driven navigation stack instead of multiple Activities or Fragments.

class Screen(context: Context) : ExpandablePageLayout(context) {
  override fun onPageAboutToExpand(expandAnimDuration: Long) {}
  override fun onPageExpanded() {}
  override fun onPageAboutToCollapse(collapseAnimDuration: Long) {}
  override fun onPageCollapsed() {}
}

Pull-to-collapse gesture

expandablePage.addOnPullListener(object: SimpleOnPullListener() {
  override fun onPull(...) {}
  override fun onRelease(collapseEligible: Boolean) {}
})