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46 lines
1.5 KiB
Kotlin
46 lines
1.5 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.tabstray.browser
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import android.util.LruCache
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import androidx.recyclerview.widget.RecyclerView
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import mozilla.components.concept.tabstray.Tab
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internal const val INITIAL_NUMBER_OF_TABS = 20
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internal const val CACHE_SIZE_MULTIPLIER = 1.5
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/**
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* Storage for Browser tabs that need a stable ID for each item in a [RecyclerView.Adapter].
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* This ID is commonly needed by [RecyclerView.Adapter.getItemId] when
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* enabling [RecyclerView.Adapter.setHasStableIds].
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*/
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internal class TabAdapterIdStorage(initialSize: Int = INITIAL_NUMBER_OF_TABS) {
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private val uniqueTabIds = LruCache<String, Long>(initialSize)
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private var lastUsedSuggestionId = 0L
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/**
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* Returns a unique tab ID for the given [Tab].
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*/
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fun getStableId(tab: Tab): Long {
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val key = tab.id
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return uniqueTabIds[key] ?: run {
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lastUsedSuggestionId += 1
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uniqueTabIds.put(key, lastUsedSuggestionId)
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lastUsedSuggestionId
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}
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}
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/**
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* Resizes the internal cache size if the [count] is larger than what is currently available.
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*/
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fun resizeCacheIfNeeded(count: Int) {
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val currentMaxSize = uniqueTabIds.maxSize()
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if (count > currentMaxSize) {
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val newMaxSize = (count * CACHE_SIZE_MULTIPLIER).toInt()
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uniqueTabIds.resize(newMaxSize)
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}
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}
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}
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