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discord-gists / CustomPanelGestureDetection.kt

Last active March 2, 2022 19:16

a simplified code example for how Discord's Android app supports custom panel gesture detection

	class OverlappingPanelsLayout : FrameLayout {

	private var scrollingSlopPx: Float = 0f
	private var velocityTracker: VelocityTracker? = null

	private var isScrollingHorizontally = false
	private var xFromInterceptActionDown: Float = 0f
	private var yFromInterceptActionDown: Float = 0f

	... // initialize scrollingSlopPx and VelocityTracker

discord-gists / PanelsHorizontalScrollingInChildViews.kt

Last active March 2, 2022 19:22

a simplified code example of how Discord's Android app selectively allows child views of OverlappingPanelsLayout to handle their own horizontal scrolls

	class PanelsChildGestureRegionObserver : View.OnLayoutChangeListener {
	...
	override fun onLayoutChange(
	view: View?,
	left: Int,
	top: Int,
	right: Int,
	bottom: Int,
	oldLeft: Int,
	oldTop: Int,

discord-gists / PanelsPreLayoutViewUpdates.kt

Last active August 30, 2020 15:35

a simplified code example of how Discord's Android app maintains panel states through device rotations while applying view updates before onLayout

	class OverlappingPanelsLayout: FrameLayout {
	private lateinit var startPanel: View
	private lateinit var centerPanel: View
	private lateinit var endPanel: View
	private var pendingUpdate: (() -> Unit)? = null

	...

	private fun openStartPanel() {