439 lines
16 KiB
Kotlin
439 lines
16 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.settings
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/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import android.content.Context
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import android.content.res.TypedArray
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import android.os.Parcel
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import android.os.Parcelable
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import android.util.AttributeSet
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import android.util.Log
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import android.util.TypedValue
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import android.view.KeyEvent
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import android.view.View
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import android.widget.SeekBar
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import android.widget.SeekBar.OnSeekBarChangeListener
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import android.widget.TextView
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import androidx.preference.Preference
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import androidx.preference.PreferenceViewHolder
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import org.mozilla.fenix.R
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import java.text.NumberFormat
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/**
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* Preference based on android.preference.SeekBarPreference but uses support preference as a base.
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* It contains a title and a [SeekBar] and a SeekBar value [TextView] and an Example [TextView].
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* The actual preference layout is customizable by setting `android:layout` on the
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* preference widget layout or `seekBarPreferenceStyle` attribute.
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*
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* The [SeekBar] within the preference can be defined adjustable or not by setting `adjustable` attribute.
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* If adjustable, the preference will be responsive to DPAD left/right keys.
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* Otherwise, it skips those keys.
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*
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* The [SeekBar] value view can be shown or disabled by setting `showSeekBarValue`
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* attribute to true or false, respectively.
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*
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* Other [SeekBar] specific attributes (e.g. `title, summary, defaultValue, min, max`)
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* can be set directly on the preference widget layout.
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*/
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class TextPercentageSeekBarPreference @JvmOverloads constructor(
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context: Context,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = R.attr.seekBarPreferenceStyle,
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defStyleRes: Int = 0
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) : Preference(context, attrs, defStyleAttr, defStyleRes) {
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/* synthetic access */
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internal var mSeekBarValue: Int = 0
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/* synthetic access */
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internal var mMin: Int = 0
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private var mMax: Int = 0
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private var mSeekBarIncrement: Int = 0
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/* synthetic access */
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internal var mTrackingTouch: Boolean = false
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/* synthetic access */
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internal var mSeekBar: SeekBar? = null
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private var mSeekBarValueTextView: TextView? = null
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private var mExampleTextTextView: TextView? = null
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/**
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* Whether the SeekBar should respond to the left/right keys
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*/
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/* synthetic access */
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var isAdjustable: Boolean = false
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/**
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* Whether to show the SeekBar value TextView next to the bar
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*/
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private var mShowSeekBarValue: Boolean = false
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/**
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* Whether the SeekBarPreference should continuously save the Seekbar value while it is being dragged.
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*/
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/* synthetic access */
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var updatesContinuously: Boolean = false
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/**
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* Listener reacting to the [SeekBar] changing value by the user
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*/
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private val mSeekBarChangeListener = object : OnSeekBarChangeListener {
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override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
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if (fromUser && (updatesContinuously || !mTrackingTouch)) {
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syncValueInternal(seekBar)
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} else {
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// We always want to update the text while the seekbar is being dragged
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updateLabelValue(progress + mMin)
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updateExampleTextValue(progress + mMin)
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}
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}
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override fun onStartTrackingTouch(seekBar: SeekBar) {
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mTrackingTouch = true
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}
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override fun onStopTrackingTouch(seekBar: SeekBar) {
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mTrackingTouch = false
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if (seekBar.progress + mMin != mSeekBarValue) {
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syncValueInternal(seekBar)
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}
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}
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}
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/**
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* Listener reacting to the user pressing DPAD left/right keys if `adjustable` attribute is
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* set to true; it transfers the key presses to the [SeekBar]
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* to be handled accordingly.
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*/
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private val mSeekBarKeyListener = View.OnKeyListener { _, keyCode, event ->
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return@OnKeyListener if (event.action != KeyEvent.ACTION_DOWN) {
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false
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} else if (!isAdjustable && (keyCode == KeyEvent.KEYCODE_DPAD_LEFT || keyCode == KeyEvent.KEYCODE_DPAD_RIGHT)) {
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// Right or left keys are pressed when in non-adjustable mode; Skip the keys.
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false
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} else if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) {
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// We don't want to propagate the click keys down to the SeekBar view since it will
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// create the ripple effect for the thumb.
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false
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} else if (mSeekBar == null) {
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Log.e(TAG, "SeekBar view is null and hence cannot be adjusted.")
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false
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} else {
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mSeekBar!!.onKeyDown(keyCode, event)
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}
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}
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/**
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* Gets the lower bound set on the [SeekBar].
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* @return The lower bound set
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* Sets the lower bound on the [SeekBar].
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* @param min The lower bound to set
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*/
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var min: Int
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get() = mMin
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set(min) {
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var minimum = min
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if (minimum > mMax) {
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minimum = mMax
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}
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if (minimum != mMin) {
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mMin = minimum
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notifyChanged()
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}
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}
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/**
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* Returns the amount of increment change via each arrow key click. This value is derived from
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* user's specified increment value if it's not zero. Otherwise, the default value is picked
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* from the default mKeyProgressIncrement value in [android.widget.AbsSeekBar].
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* @return The amount of increment on the [SeekBar] performed after each user's arrow
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* key press
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*/
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var seekBarIncrement: Int
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get() = mSeekBarIncrement
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/**
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* Sets the increment amount on the [SeekBar] for each arrow key press.
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* @param seekBarIncrement The amount to increment or decrement when the user presses an
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* arrow key.
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*/
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set(seekBarIncrement) {
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if (seekBarIncrement != mSeekBarIncrement) {
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mSeekBarIncrement = Math.min(mMax - mMin, Math.abs(seekBarIncrement))
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notifyChanged()
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}
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}
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/**
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* Gets/Sets the upper bound set on the [SeekBar].
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*/
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var max: Int
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get() = mMax
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set(max) {
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var maximum = max
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if (maximum < mMin) {
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maximum = mMin
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}
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if (maximum != mMax) {
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mMax = maximum
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notifyChanged()
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}
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}
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/**
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* Gets whether the current [SeekBar] value is displayed to the user.
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* @return Whether the current [SeekBar] value is displayed to the user
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* @see .setShowSeekBarValue
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*/
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var showSeekBarValue: Boolean
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get() = mShowSeekBarValue
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/**
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* Sets whether the current [SeekBar] value is displayed to the user.
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* @param showSeekBarValue Whether the current [SeekBar] value is displayed to the user
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* @see .getShowSeekBarValue
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*/
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set(showSeekBarValue) {
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mShowSeekBarValue = showSeekBarValue
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notifyChanged()
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}
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/**
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* Gets/Sets the current progress of the [SeekBar].
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*/
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var value: Int
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get() = mSeekBarValue
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set(seekBarValue) = setValueInternal(seekBarValue, true)
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init {
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val a = context.obtainStyledAttributes(
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attrs, R.styleable.SeekBarPreference, defStyleAttr, defStyleRes
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)
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// The ordering of these two statements are important. If we want to set max first, we need
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// to perform the same steps by changing min/max to max/min as following:
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// mMax = a.getInt(...) and setMin(...).
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mMin = a.getInt(R.styleable.SeekBarPreference_min, 0)
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max = a.getInt(R.styleable.SeekBarPreference_android_max, SEEK_BAR_MAX)
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seekBarIncrement = a.getInt(R.styleable.SeekBarPreference_seekBarIncrement, 0)
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isAdjustable = a.getBoolean(R.styleable.SeekBarPreference_adjustable, true)
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mShowSeekBarValue = a.getBoolean(R.styleable.SeekBarPreference_showSeekBarValue, false)
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updatesContinuously = a.getBoolean(
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R.styleable.SeekBarPreference_updatesContinuously,
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false
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)
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a.recycle()
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}
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override fun onBindViewHolder(view: PreferenceViewHolder) {
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super.onBindViewHolder(view)
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view.itemView.setOnKeyListener(mSeekBarKeyListener)
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mSeekBar = view.findViewById(R.id.seekbar) as SeekBar
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mExampleTextTextView = view.findViewById(R.id.sampleText) as TextView
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mSeekBarValueTextView = view.findViewById(R.id.seekbar_value) as TextView
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if (mShowSeekBarValue) {
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mSeekBarValueTextView?.visibility = View.VISIBLE
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} else {
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mSeekBarValueTextView?.visibility = View.GONE
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mSeekBarValueTextView = null
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}
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if (mSeekBar == null) {
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Log.e(TAG, "SeekBar view is null in onBindViewHolder.")
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return
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}
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mSeekBar?.setOnSeekBarChangeListener(mSeekBarChangeListener)
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mSeekBar?.max = mMax - mMin
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// If the increment is not zero, use that. Otherwise, use the default mKeyProgressIncrement
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// in AbsSeekBar when it's zero. This default increment value is set by AbsSeekBar
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// after calling setMax. That's why it's important to call setKeyProgressIncrement after
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// calling setMax() since setMax() can change the increment value.
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if (mSeekBarIncrement != 0) {
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mSeekBar?.keyProgressIncrement = mSeekBarIncrement
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} else {
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mSeekBarIncrement = mSeekBar!!.keyProgressIncrement
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}
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mSeekBar?.progress = mSeekBarValue - mMin
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updateExampleTextValue(mSeekBarValue)
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updateLabelValue(mSeekBarValue)
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mSeekBar?.isEnabled = isEnabled
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}
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override fun onSetInitialValue(initialValue: Any?) {
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var defaultValue = initialValue
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if (defaultValue == null) {
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defaultValue = 0
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}
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value = getPersistedInt((defaultValue as Int?)!!)
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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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private fun setValueInternal(value: Int, notifyChanged: Boolean) {
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var seekBarValue = value
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if (seekBarValue < mMin) {
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seekBarValue = mMin
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}
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if (seekBarValue > mMax) {
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seekBarValue = mMax
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}
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if (seekBarValue != mSeekBarValue) {
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mSeekBarValue = seekBarValue
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updateLabelValue(mSeekBarValue)
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updateExampleTextValue(mSeekBarValue)
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persistInt(seekBarValue)
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if (notifyChanged) {
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notifyChanged()
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}
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}
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}
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/**
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* Persist the [SeekBar]'s SeekBar value if callChangeListener returns true, otherwise
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* set the [SeekBar]'s value to the stored value.
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*/
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/* synthetic access */
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internal fun syncValueInternal(seekBar: SeekBar) {
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val seekBarValue = mMin + seekBar.progress
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if (seekBarValue != mSeekBarValue) {
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if (callChangeListener(seekBarValue)) {
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setValueInternal(seekBarValue, false)
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} else {
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seekBar.progress = mSeekBarValue - mMin
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updateLabelValue(mSeekBarValue)
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updateExampleTextValue(mSeekBarValue)
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}
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}
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}
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/**
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* Attempts to update the TextView label that displays the current value.
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*
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* @param labelValue the value to display next to the [SeekBar]
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*/
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/* synthetic access */
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internal fun updateLabelValue(labelValue: Int) {
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var value = labelValue
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if (mSeekBarValueTextView != null) {
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value = value * STEP_SIZE + MIN_VALUE
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val decimalValue = (value / DECIMAL_CONVERSION).toDouble()
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val percentage = NumberFormat.getPercentInstance().format(decimalValue)
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mSeekBarValueTextView?.text = percentage
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}
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}
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/**
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* Attempts to update the example TextView text with text scale size.
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*
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* @param textValue the value of text size
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*/
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internal fun updateExampleTextValue(textValue: Int) {
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var value = textValue
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if (mExampleTextTextView != null) {
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value = value * STEP_SIZE + MIN_VALUE
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val decimal = value / DECIMAL_CONVERSION
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val textSize = TEXT_SIZE * decimal
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mExampleTextTextView?.setTextSize(TypedValue.COMPLEX_UNIT_SP, textSize)
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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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// Save the instance state
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val myState = SavedState(superState)
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myState.mSeekBarValue = mSeekBarValue
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myState.mMin = mMin
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myState.mMax = mMax
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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?.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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// Restore the instance state
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val myState = state as SavedState?
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super.onRestoreInstanceState(myState!!.superState)
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mSeekBarValue = myState.mSeekBarValue
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mMin = myState.mMin
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mMax = myState.mMax
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notifyChanged()
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}
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/**
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* SavedState, a subclass of [BaseSavedState], will store the state of this preference.
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*
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*
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* It is important to always call through to super methods.
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*/
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private class SavedState : BaseSavedState {
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internal var mSeekBarValue: Int = 0
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internal var mMin: Int = 0
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internal var mMax: Int = 0
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internal constructor(source: Parcel) : super(source) {
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// Restore the click counter
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mSeekBarValue = source.readInt()
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mMin = source.readInt()
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mMax = source.readInt()
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}
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internal 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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// Save the click counter
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dest.writeInt(mSeekBarValue)
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dest.writeInt(mMin)
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dest.writeInt(mMax)
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}
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companion object {
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@JvmField
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val CREATOR: Parcelable.Creator<SavedState> = object : Parcelable.Creator<SavedState> {
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override fun createFromParcel(`in`: Parcel): SavedState {
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return SavedState(`in`)
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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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companion object {
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private const val TAG = "SeekBarPreference"
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private const val STEP_SIZE = 5
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private const val MIN_VALUE = 50
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private const val DECIMAL_CONVERSION = 100f
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private const val TEXT_SIZE = 16f
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private const val SEEK_BAR_MAX = 100
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}
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}
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