1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settings.accessibility; 18 19 import android.content.Context; 20 import android.widget.SeekBar; 21 22 import androidx.annotation.NonNull; 23 import androidx.preference.PreferenceScreen; 24 25 import com.android.settings.core.BasePreferenceController; 26 import com.android.settings.widget.LabeledSeekBarPreference; 27 28 /** 29 * The controller of {@link LabeledSeekBarPreference} that listens to display size and font size 30 * settings changes and updates preview size threshold smoothly. 31 */ 32 class PreviewSizeSeekBarController extends BasePreferenceController implements 33 TextReadingResetController.ResetStateListener { 34 private final PreviewSizeData<? extends Number> mSizeData; 35 private boolean mSeekByTouch; 36 private ProgressInteractionListener mInteractionListener; 37 private LabeledSeekBarPreference mSeekBarPreference; 38 39 private final SeekBar.OnSeekBarChangeListener mSeekBarChangeListener = 40 new SeekBar.OnSeekBarChangeListener() { 41 @Override 42 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 43 mInteractionListener.notifyPreferenceChanged(); 44 45 if (!mSeekByTouch && mInteractionListener != null) { 46 mInteractionListener.onProgressChanged(); 47 } 48 49 } 50 51 @Override 52 public void onStartTrackingTouch(SeekBar seekBar) { 53 mSeekByTouch = true; 54 } 55 56 @Override 57 public void onStopTrackingTouch(SeekBar seekBar) { 58 mSeekByTouch = false; 59 60 if (mInteractionListener != null) { 61 mInteractionListener.onEndTrackingTouch(); 62 } 63 } 64 }; 65 PreviewSizeSeekBarController(Context context, String preferenceKey, @NonNull PreviewSizeData<? extends Number> sizeData)66 PreviewSizeSeekBarController(Context context, String preferenceKey, 67 @NonNull PreviewSizeData<? extends Number> sizeData) { 68 super(context, preferenceKey); 69 mSizeData = sizeData; 70 } 71 setInteractionListener(ProgressInteractionListener interactionListener)72 void setInteractionListener(ProgressInteractionListener interactionListener) { 73 mInteractionListener = interactionListener; 74 } 75 76 @Override getAvailabilityStatus()77 public int getAvailabilityStatus() { 78 return AVAILABLE; 79 } 80 81 @Override displayPreference(PreferenceScreen screen)82 public void displayPreference(PreferenceScreen screen) { 83 super.displayPreference(screen); 84 85 final int dataSize = mSizeData.getValues().size(); 86 final int initialIndex = mSizeData.getInitialIndex(); 87 mSeekBarPreference = screen.findPreference(getPreferenceKey()); 88 mSeekBarPreference.setMax(dataSize - 1); 89 mSeekBarPreference.setProgress(initialIndex); 90 mSeekBarPreference.setContinuousUpdates(true); 91 mSeekBarPreference.setOnSeekBarChangeListener(mSeekBarChangeListener); 92 } 93 94 @Override resetState()95 public void resetState() { 96 final int defaultProgress = mSizeData.getValues().indexOf(mSizeData.getDefaultValue()); 97 mSeekBarPreference.setProgress(defaultProgress); 98 } 99 100 101 /** 102 * Interface for callbacks when users interact with the seek bar. 103 */ 104 interface ProgressInteractionListener { 105 106 /** 107 * Called when the progress is changed. 108 */ notifyPreferenceChanged()109 void notifyPreferenceChanged(); 110 111 /** 112 * Called when the progress is changed without tracking touch. 113 */ onProgressChanged()114 void onProgressChanged(); 115 116 /** 117 * Called when the seek bar is end tracking. 118 */ onEndTrackingTouch()119 void onEndTrackingTouch(); 120 } 121 } 122