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view/src/main/java/com/kizitonwose/calendar/view/internal/CalendarPageSnapHelperLegacy.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package com.kizitonwose.calendar.view.internal | ||
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| import android.view.View | ||
| import androidx.recyclerview.widget.OrientationHelper | ||
| import androidx.recyclerview.widget.PagerSnapHelper | ||
| import androidx.recyclerview.widget.RecyclerView | ||
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| internal class CalendarPageSnapHelperLegacy : PagerSnapHelper() { | ||
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| /** | ||
| * The default implementation of this method in [PagerSnapHelper.calculateDistanceToFinalSnap] uses the distance | ||
| * between the target view center vs RecyclerView center as final snap distance. This does not always give the | ||
| * desired result for calendar usage. For example in a vertical calendar when the RecyclerView is taller than | ||
| * the item view(e.g two or more visible months), we don't actually want the item view's center to be at the | ||
| * center of the RecyclerView when it snaps but instead we want the item view and RecyclerView top(in vertical) | ||
| * or left(in horizontal) to match at the end of the snap. | ||
| * | ||
| * Keeping this class to be used in horizontal calendar due to | ||
| * https://github.com/kizitonwose/Calendar/issues/466#issuecomment-1719337527 | ||
| */ | ||
| override fun calculateDistanceToFinalSnap( | ||
| layoutManager: RecyclerView.LayoutManager, | ||
| targetView: View, | ||
| ): IntArray { | ||
| return IntArray(2).apply { | ||
| this[0] = if (layoutManager.canScrollHorizontally()) { | ||
| distanceToStart(targetView, getHorizontalHelper(layoutManager)) | ||
| } else 0 | ||
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| this[1] = if (layoutManager.canScrollVertically()) { | ||
| distanceToStart(targetView, getVerticalHelper(layoutManager)) | ||
| } else 0 | ||
| } | ||
| } | ||
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| private fun distanceToStart(targetView: View, helper: OrientationHelper): Int { | ||
| val childStart = (helper.getDecoratedStart(targetView)) | ||
| val containerStart = helper.startAfterPadding | ||
| return childStart - containerStart | ||
| } | ||
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| private lateinit var verticalHelper: OrientationHelper | ||
| private lateinit var horizontalHelper: OrientationHelper | ||
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| private fun getVerticalHelper(layoutManager: RecyclerView.LayoutManager): OrientationHelper { | ||
| if (!::verticalHelper.isInitialized || verticalHelper.layoutManager != layoutManager) { | ||
| verticalHelper = OrientationHelper.createVerticalHelper(layoutManager) | ||
| } | ||
| return verticalHelper | ||
| } | ||
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| private fun getHorizontalHelper(layoutManager: RecyclerView.LayoutManager): OrientationHelper { | ||
| if (!::horizontalHelper.isInitialized || horizontalHelper.layoutManager != layoutManager) { | ||
| horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager) | ||
| } | ||
| return horizontalHelper | ||
| } | ||
| } |