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Merge pull request #818 from Automattic/task/add-auto-scroll-discover…
…-carousal Add auto scroll to discover featured carousal
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40 changes: 40 additions & 0 deletions
40
...s/discover/src/main/java/au/com/shiftyjelly/pocketcasts/discover/util/AutoScrollHelper.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package au.com.shiftyjelly.pocketcasts.discover.util | ||
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| import java.util.Timer | ||
| import java.util.TimerTask | ||
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| private const val AUTO_SCROLL_INTERVAL = 5000L | ||
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| class AutoScrollHelper(private val onAutoScrollCompleted: () -> Unit) { | ||
| private var autoScrollTimer: Timer? = null | ||
| private var autoScrollTimerTask: TimerTask? = null | ||
| private var skipAutoScroll = false | ||
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| fun startAutoScrollTimer(delay: Long = 0L) { | ||
| if (autoScrollTimerTask != null) return | ||
| autoScrollTimerTask = object : TimerTask() { | ||
| override fun run() { | ||
| if (!skipAutoScroll) onAutoScrollCompleted() | ||
| skipAutoScroll = false | ||
| } | ||
| } | ||
| autoScrollTimer = Timer().apply { | ||
| schedule(autoScrollTimerTask, delay, AUTO_SCROLL_INTERVAL) | ||
| } | ||
| } | ||
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| fun stopAutoScrollTimer() { | ||
| autoScrollTimer?.cancel() | ||
| autoScrollTimerTask?.cancel() | ||
| autoScrollTimer = null | ||
| autoScrollTimerTask = null | ||
| } | ||
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| fun skipAutoScroll() { | ||
| skipAutoScroll = true | ||
| } | ||
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| companion object { | ||
| const val AUTO_SCROLL_DELAY = 5000L | ||
| } | ||
| } |
43 changes: 43 additions & 0 deletions
43
...rc/main/java/au/com/shiftyjelly/pocketcasts/discover/util/ScrollingLinearLayoutManager.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package au.com.shiftyjelly.pocketcasts.discover.util | ||
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| import android.content.Context | ||
| import android.util.DisplayMetrics | ||
| import androidx.recyclerview.widget.LinearLayoutManager | ||
| import androidx.recyclerview.widget.LinearSmoothScroller | ||
| import androidx.recyclerview.widget.RecyclerView | ||
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| /* | ||
| 1. Increases scrolling speed of recyclerView.smoothScrollToPosition(position) | ||
| 2. Sets custom extra layout space for pre caching an extra page | ||
| */ | ||
| class ScrollingLinearLayoutManager( | ||
| context: Context?, | ||
| orientation: Int, | ||
| reverseLayout: Boolean, | ||
| ) : LinearLayoutManager(context, orientation, reverseLayout) { | ||
| override fun smoothScrollToPosition( | ||
| recyclerView: RecyclerView, | ||
| state: RecyclerView.State, | ||
| position: Int, | ||
| ) { | ||
| val linearSmoothScroller: LinearSmoothScroller = | ||
| object : LinearSmoothScroller(recyclerView.context) { | ||
| override fun calculateSpeedPerPixel(displayMetrics: DisplayMetrics): Float { | ||
| return MILLISECONDS_PER_INCH / displayMetrics.densityDpi | ||
| } | ||
| } | ||
| linearSmoothScroller.targetPosition = position | ||
| startSmoothScroll(linearSmoothScroller) | ||
| } | ||
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| /* By default, LinearLayoutManager lays out 1 extra page of items while smooth scrolling, in the direction of the scroll. | ||
| This behavior is overridden to lay out an extra page even on a manual swipe. */ | ||
| override fun calculateExtraLayoutSpace(state: RecyclerView.State, extraLayoutSpace: IntArray) { | ||
| extraLayoutSpace[0] = 0 | ||
| extraLayoutSpace[1] = this.width | ||
| } | ||
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| companion object { | ||
| private const val MILLISECONDS_PER_INCH = 100f // default is 25f (bigger = slower) | ||
| } | ||
| } |
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