git.hungrycats.org Git - xscreensaver/blob - android/project/xscreensaver/src/org/jwz/xscreensaver/SliderPreference.java

   1 /*
   2  * Copyright 2012 Jay Weisskopf
   3  *
   4  * Licensed under the MIT License (see LICENSE.txt)
   5  */
   6
   7 //package net.jayschwa.android.preference;
   8 package org.jwz.xscreensaver;
   9
  10
  11 import android.content.Context;
  12 import android.content.res.TypedArray;
  13 import android.preference.DialogPreference;
  14 import android.util.AttributeSet;
  15 import android.view.View;
  16 import android.widget.SeekBar;
  17
  18 /**
  19  * @author Jay Weisskopf
  20  */
  21 public class SliderPreference extends DialogPreference {
  22
  23         protected final static int SEEKBAR_RESOLUTION = 10000;
  24
  25         protected float mValue;
  26         protected int mSeekBarValue;
  27         protected CharSequence[] mSummaries;
  28
  29         /**
  30          * @param context
  31          * @param attrs
  32          */
  33         public SliderPreference(Context context, AttributeSet attrs) {
  34                 super(context, attrs);
  35                 setup(context, attrs);
  36         }
  37
  38         /**
  39          * @param context
  40          * @param attrs
  41          * @param defStyle
  42          */
  43         public SliderPreference(Context context, AttributeSet attrs, int defStyle) {
  44                 super(context, attrs, defStyle);
  45                 setup(context, attrs);
  46         }
  47
  48         private void setup(Context context, AttributeSet attrs) {
  49                 setDialogLayoutResource(R.layout.slider_preference_dialog);
  50                 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SliderPreference);
  51                 try {
  52                         setSummary(a.getTextArray(R.styleable.SliderPreference_android_summary));
  53                 } catch (Exception e) {
  54                         // Do nothing
  55                 }
  56                 a.recycle();
  57         }
  58
  59         @Override
  60         protected Object onGetDefaultValue(TypedArray a, int index) {
  61                 return a.getFloat(index, 0);
  62         }
  63
  64         @Override
  65         protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
  66                 setValue(restoreValue ? getPersistedFloat(mValue) : (Float) defaultValue);
  67         }
  68
  69         @Override
  70         public CharSequence getSummary() {
  71                 if (mSummaries != null && mSummaries.length > 0) {
  72                         int index = (int) (mValue * mSummaries.length);
  73                         index = Math.min(index, mSummaries.length - 1);
  74                         return mSummaries[index];
  75                 } else {
  76                         return super.getSummary();
  77                 }
  78         }
  79
  80         public void setSummary(CharSequence[] summaries) {
  81                 mSummaries = summaries;
  82         }
  83
  84         @Override
  85         public void setSummary(CharSequence summary) {
  86                 super.setSummary(summary);
  87                 mSummaries = null;
  88         }
  89
  90         @Override
  91         public void setSummary(int summaryResId) {
  92                 try {
  93                         setSummary(getContext().getResources().getStringArray(summaryResId));
  94                 } catch (Exception e) {
  95                         super.setSummary(summaryResId);
  96                 }
  97         }
  98
  99         public float getValue() {
 100                 return mValue;
 101         }
 102
 103         public void setValue(float value) {
 104                 value = Math.max(0, Math.min(value, 1)); // clamp to [0, 1]
 105                 if (shouldPersist()) {
 106                         persistFloat(value);
 107                 }
 108                 if (value != mValue) {
 109                         mValue = value;
 110                         notifyChanged();
 111                 }
 112         }
 113
 114         @Override
 115         protected View onCreateDialogView() {
 116                 mSeekBarValue = (int) (mValue * SEEKBAR_RESOLUTION);
 117                 View view = super.onCreateDialogView();
 118                 SeekBar seekbar = (SeekBar) view.findViewById(R.id.slider_preference_seekbar);
 119                 seekbar.setMax(SEEKBAR_RESOLUTION);
 120                 seekbar.setProgress(mSeekBarValue);
 121                 seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
 122
 123                         @Override
 124                         public void onStopTrackingTouch(SeekBar seekBar) {
 125                         }
 126
 127                         @Override
 128                         public void onStartTrackingTouch(SeekBar seekBar) {
 129                         }
 130
 131                         @Override
 132                         public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
 133                                 if (fromUser) {
 134                                         SliderPreference.this.mSeekBarValue = progress;
 135                                 }
 136                         }
 137                 });
 138                 return view;
 139         }
 140
 141         @Override
 142         protected void onDialogClosed(boolean positiveResult) {
 143                 final float newValue = (float) mSeekBarValue / SEEKBAR_RESOLUTION;
 144                 if (positiveResult && callChangeListener(newValue)) {
 145                         setValue(newValue);
 146                 }
 147                 super.onDialogClosed(positiveResult);
 148         }
 149
 150         // TODO: Save and restore preference state.
 151 }