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