65 lines
2.6 KiB
Kotlin
65 lines
2.6 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.collections
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import androidx.recyclerview.widget.DiffUtil
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import org.mozilla.fenix.home.Tab
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/**
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* Diff callback for comparing tab lists with selected state.
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*/
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@Suppress("LongParameterList")
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internal class TabDiffUtil(
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private val old: List<Tab>,
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private val new: List<Tab>,
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private val oldSelected: Set<Tab>,
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private val newSelected: Set<Tab>,
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private val oldHideCheckboxes: Boolean,
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private val newHideCheckboxes: Boolean
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) : DiffUtil.Callback() {
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/**
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* Checks if the tabs in the given positions refer to the same tab (based on ID).
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*/
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override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean =
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old[oldItemPosition].sessionId == new[newItemPosition].sessionId
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/**
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* Checks if the combination of tab ID, selection, and checkbox visibility is the same.
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*/
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override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
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val isSameTab = old[oldItemPosition].sessionId == new[newItemPosition].sessionId
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val sameSelectedState = oldItemSelected(oldItemPosition) == newItemSelected(newItemPosition)
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val isSameHideCheckboxes = oldHideCheckboxes == newHideCheckboxes
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return isSameTab && sameSelectedState && isSameHideCheckboxes
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}
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/**
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* Returns a change payload indication if the item is now/no longer selected.
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*/
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override fun getChangePayload(oldItemPosition: Int, newItemPosition: Int): Any? {
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val shouldBeChecked = newItemSelected(newItemPosition) && !oldItemSelected(oldItemPosition)
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val shouldBeUnchecked = !newItemSelected(newItemPosition) && oldItemSelected(oldItemPosition)
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return CheckChanged(shouldBeChecked, shouldBeUnchecked, newHideCheckboxes)
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}
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override fun getOldListSize(): Int = old.size
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override fun getNewListSize(): Int = new.size
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private fun oldItemSelected(oldItemPosition: Int) = oldSelected.contains(old[oldItemPosition])
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private fun newItemSelected(newItemPosition: Int) = newSelected.contains(new[newItemPosition])
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}
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/**
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* @property shouldBeChecked Item was previously unchecked and should be checked.
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* @property shouldBeUnchecked Item was previously checked and should be unchecked.
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* @property shouldHideCheckBox Checkbox should be visible.
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*/
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data class CheckChanged(
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val shouldBeChecked: Boolean,
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val shouldBeUnchecked: Boolean,
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val shouldHideCheckBox: Boolean
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)
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