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https://github.com/skyline-emu/skyline.git
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Implement an IntegerListPreference
Unlike `ListPreference`, this preference class uses integers as its values instead of strings, avoiding unnecessary casting. It also doesn't require an array for values: in that case it will be using the clicked entry position as its value.
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sspacelynx
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parent
fdc7e1238a
commit
c1a3ddcd1c
@ -9,8 +9,10 @@ import android.os.Bundle
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import android.view.KeyEvent
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import android.view.View
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import androidx.appcompat.app.AppCompatActivity
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import androidx.preference.Preference
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import androidx.preference.PreferenceFragmentCompat
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import emu.skyline.databinding.SettingsActivityBinding
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import emu.skyline.preference.IntegerListPreference
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class SettingsActivity : AppCompatActivity() {
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val binding by lazy { SettingsActivityBinding.inflate(layoutInflater) }
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@ -45,6 +47,9 @@ class SettingsActivity : AppCompatActivity() {
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* This fragment is used to display all of the preferences
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*/
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class PreferenceFragment : PreferenceFragmentCompat() {
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companion object {
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private const val DIALOG_FRAGMENT_TAG = "androidx.preference.PreferenceFragment.DIALOG"
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}
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/**
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* This constructs the preferences from [R.xml.preferences]
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@ -52,6 +57,21 @@ class SettingsActivity : AppCompatActivity() {
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override fun onCreatePreferences(savedInstanceState : Bundle?, rootKey : String?) {
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setPreferencesFromResource(R.xml.preferences, rootKey)
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}
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override fun onDisplayPreferenceDialog(preference : Preference?) {
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if (preference is IntegerListPreference) {
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// check if dialog is already showing
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if (parentFragmentManager.findFragmentByTag(DIALOG_FRAGMENT_TAG) != null) {
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return
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}
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val f = IntegerListPreference.IntegerListPreferenceDialogFragmentCompat.newInstance(preference.getKey())
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f.setTargetFragment(this, 0)
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f.show(parentFragmentManager, DIALOG_FRAGMENT_TAG)
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} else {
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super.onDisplayPreferenceDialog(preference)
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}
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}
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}
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/**
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@ -0,0 +1,318 @@
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/*
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* SPDX-License-Identifier: MPL-2.0
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* Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
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*/
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package emu.skyline.preference
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import java.lang.Exception
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import android.os.Bundle
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import android.os.Parcel
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import android.os.Parcelable
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import android.os.Parcelable.Creator
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import android.util.AttributeSet
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import android.content.Context
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import android.content.res.Resources
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import android.content.res.TypedArray
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import android.content.DialogInterface
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import android.annotation.SuppressLint
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import androidx.annotation.ArrayRes
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import androidx.appcompat.app.AlertDialog
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import androidx.core.content.res.TypedArrayUtils
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import androidx.preference.R
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import androidx.preference.DialogPreference
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import androidx.preference.PreferenceDialogFragmentCompat
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/**
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* A Preference that displays a list of entries as a dialog.
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* This preference saves an integer value instead of a string one.
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* @see androidx.preference.ListPreference
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*/
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@SuppressLint("RestrictedApi", "ResourceType")
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class IntegerListPreference @JvmOverloads constructor(
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context : Context,
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attrs : AttributeSet? = null,
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defStyleAttr : Int = TypedArrayUtils.getAttr(
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context, R.attr.dialogPreferenceStyle,
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R.attr.dialogPreferenceStyle
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),
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defStyleRes : Int = 0
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) : DialogPreference(context, attrs, defStyleAttr, defStyleRes) {
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/**
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* The list of entries to be shown in the list in subsequent dialogs.
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*/
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var entries : Array<CharSequence>?
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/**
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* The array to find the value to save for a preference when an entry from entries is
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* selected. If a user clicks on the second item in entries, the second item in this array
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* will be saved to the preference.
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*/
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var entryValues : IntArray?
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private var value : Int? = null
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set(value) {
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// Always persist/notify the first time.
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val changed = field != value
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if (changed || !isValueSet) {
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field = value
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isValueSet = true
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value?.let { persistInt(it) }
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if (changed) {
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notifyChanged()
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}
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}
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}
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private var isValueSet = false
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init {
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val res : Resources = context.resources
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val entryValuesId = attrs!!.getAttributeResourceValue("http://schemas.android.com/apk/res/android", "entryValues", 0)
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var a = context.obtainStyledAttributes(
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attrs, R.styleable.ListPreference, defStyleAttr, defStyleRes
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)
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entries = TypedArrayUtils.getTextArray(
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a, R.styleable.ListPreference_entries,
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R.styleable.ListPreference_android_entries
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)
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entryValues = try { res.getIntArray(entryValuesId) } catch (e : Exception) { null }
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if (TypedArrayUtils.getBoolean(
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a, R.styleable.ListPreference_useSimpleSummaryProvider,
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R.styleable.ListPreference_useSimpleSummaryProvider, false
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)
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) {
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summaryProvider = SimpleSummaryProvider.instance
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}
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a.recycle()
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//Retrieve the Preference summary attribute since it's private in the Preference class.
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a = context.obtainStyledAttributes(
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attrs,
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R.styleable.Preference, defStyleAttr, defStyleRes
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)
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a.recycle()
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}
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/**
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* @param entriesResId The entries array as a resource
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*/
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fun setEntries(@ArrayRes entriesResId : Int) {
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entries = context.resources.getTextArray(entriesResId)
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}
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/**
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* @param entryValuesResId The entry values array as a resource
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*/
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fun setEntryValues(@ArrayRes entryValuesResId : Int) {
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entryValues = context.resources.getIntArray(entryValuesResId)
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}
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/**
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* @return The entry corresponding to the current value, or `null`
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*/
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fun getEntry() : CharSequence? {
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return entries?.getOrNull(getValueIndex())
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}
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/**
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* @param value The value whose index should be returned
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* @return The index of the value, or -1 if not found
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*/
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private fun findIndexOfValue(value : Int?) : Int {
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entryValues?.let {
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if (value != null) {
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for (i in it.indices.reversed()) {
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if (it[i] == value) {
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return i
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}
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}
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}
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}
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return value ?: -1
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}
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/**
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* Sets the value to the given index from the entry values.
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* @param index The index of the value to set
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*/
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fun setValueIndex(index : Int) {
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value = entryValues?.get(index) ?: index
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}
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private fun getValueIndex() : Int {
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return findIndexOfValue(value)
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}
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override fun onGetDefaultValue(a : TypedArray, index : Int) : Any? {
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return a.getInt(index, 0)
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}
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override fun onSetInitialValue(defaultValue : Any?) {
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// `Preference` superclass passes a null defaultValue if it is sure there
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// is already a persisted value, se we have to account for that here by
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// passing a random number as default value.
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value = if (defaultValue != null) {
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getPersistedInt(defaultValue as Int)
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} else {
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getPersistedInt(0)
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}
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}
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override fun onSaveInstanceState() : Parcelable {
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val superState = super.onSaveInstanceState()
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if (isPersistent) {
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// No need to save instance state since it's persistent
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return superState
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}
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val myState = SavedState(superState)
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myState.value = value
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return myState
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}
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override fun onRestoreInstanceState(state : Parcelable?) {
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if (state == null || state.javaClass != SavedState::class.java) {
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// Didn't save state for us in onSaveInstanceState
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super.onRestoreInstanceState(state)
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return
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}
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val myState = state as SavedState
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super.onRestoreInstanceState(myState.superState)
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value = myState.value
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}
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private class SavedState : BaseSavedState {
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var value : Int? = null
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constructor(source : Parcel) : super(source) {
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value = source.readSerializable() as Int?
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}
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constructor(superState : Parcelable?) : super(superState)
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override fun writeToParcel(dest : Parcel, flags : Int) {
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super.writeToParcel(dest, flags)
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dest.writeSerializable(value)
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}
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companion object {
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@JvmField
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val CREATOR : Creator<SavedState> = object : Creator<SavedState> {
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override fun createFromParcel(input : Parcel) : SavedState? {
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return SavedState(input)
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}
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override fun newArray(size : Int) : Array<SavedState?> {
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return arrayOfNulls(size)
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}
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}
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}
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}
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/**
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* A simple [androidx.preference.Preference.SummaryProvider] implementation for a
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* [IntegerListPreference]. If no value has been set, the summary displayed will be 'Not set',
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* otherwise the summary displayed will be the entry set for this preference.
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*/
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class SimpleSummaryProvider private constructor() : SummaryProvider<IntegerListPreference> {
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override fun provideSummary(preference : IntegerListPreference) : CharSequence {
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return preference.getEntry() ?: preference.context.getString(R.string.not_set)
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}
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companion object {
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private var simpleSummaryProvider : SimpleSummaryProvider? = null
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/**
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* Retrieve a singleton instance of this simple
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* [androidx.preference.Preference.SummaryProvider] implementation.
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*
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* @return a singleton instance of this simple
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* [androidx.preference.Preference.SummaryProvider] implementation
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*/
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val instance : SimpleSummaryProvider?
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get() {
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if (simpleSummaryProvider == null) {
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simpleSummaryProvider = SimpleSummaryProvider()
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}
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return simpleSummaryProvider
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}
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}
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}
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class IntegerListPreferenceDialogFragmentCompat : PreferenceDialogFragmentCompat() {
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var clickedDialogEntryIndex = 0
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private var entries : Array<CharSequence>? = null
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private var entryValues : IntArray? = null
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override fun onCreate(savedInstanceState : Bundle?) {
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super.onCreate(savedInstanceState)
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if (savedInstanceState == null) {
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val preference = listPreference
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check(preference.entries != null) { "IntegerListPreference requires at least the entries array." }
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clickedDialogEntryIndex = preference.findIndexOfValue(preference.value)
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entries = preference.entries
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entryValues = preference.entryValues
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} else {
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clickedDialogEntryIndex = savedInstanceState.getInt(SAVE_STATE_INDEX, 0)
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entries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES)
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entryValues = savedInstanceState.getIntArray(SAVE_STATE_ENTRY_VALUES)
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}
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}
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override fun onSaveInstanceState(outState : Bundle) {
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super.onSaveInstanceState(outState)
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outState.putInt(SAVE_STATE_INDEX, clickedDialogEntryIndex)
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outState.putCharSequenceArray(SAVE_STATE_ENTRIES, entries)
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outState.putIntArray(SAVE_STATE_ENTRY_VALUES, entryValues)
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}
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private val listPreference : IntegerListPreference
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get() = preference as IntegerListPreference
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override fun onPrepareDialogBuilder(builder : AlertDialog.Builder) {
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super.onPrepareDialogBuilder(builder)
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builder.setSingleChoiceItems(
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entries, clickedDialogEntryIndex
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) { dialog, which ->
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clickedDialogEntryIndex = which
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// Clicking on an item simulates the positive button click, and dismisses
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// the dialog.
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onClick(
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dialog,
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DialogInterface.BUTTON_POSITIVE
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)
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dialog.dismiss()
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}
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// The typical interaction for list-based dialogs is to have click-on-an-item dismiss the
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// dialog instead of the user having to press 'Ok'.
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builder.setPositiveButton(null, null)
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}
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override fun onDialogClosed(positiveResult : Boolean) {
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if (positiveResult && clickedDialogEntryIndex >= 0) {
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val value = entryValues?.get(clickedDialogEntryIndex) ?: clickedDialogEntryIndex
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val preference = listPreference
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if (preference.callChangeListener(value)) {
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preference.value = value
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}
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}
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}
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companion object {
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private const val SAVE_STATE_INDEX = "ListPreferenceDialogFragment.index"
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private const val SAVE_STATE_ENTRIES = "ListPreferenceDialogFragment.entries"
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private const val SAVE_STATE_ENTRY_VALUES = "ListPreferenceDialogFragment.entryValues"
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fun newInstance(key : String?) : IntegerListPreferenceDialogFragmentCompat {
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val fragment = IntegerListPreferenceDialogFragmentCompat()
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val b = Bundle(1)
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b.putString(ARG_KEY, key)
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fragment.arguments = b
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return fragment
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}
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}
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}
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}
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@ -72,7 +72,7 @@
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app:key="username_value"
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app:limit="31"
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app:title="@string/username" />
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<ListPreference
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<emu.skyline.preference.IntegerListPreference
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android:defaultValue="1"
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android:entries="@array/system_languages"
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android:entryValues="@array/system_lang_values"
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