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      1 /*
      2  * Copyright (C) 2013 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.inputmethod.latin;
     18 
     19 import android.app.AlertDialog;
     20 import android.content.Context;
     21 import android.content.DialogInterface;
     22 import android.content.res.TypedArray;
     23 import android.preference.DialogPreference;
     24 import android.util.AttributeSet;
     25 import android.view.View;
     26 import android.widget.SeekBar;
     27 import android.widget.TextView;
     28 
     29 public final class SeekBarDialogPreference extends DialogPreference
     30         implements SeekBar.OnSeekBarChangeListener {
     31     public interface ValueProxy {
     32         public int readValue(final String key);
     33         public int readDefaultValue(final String key);
     34         public void writeValue(final int value, final String key);
     35         public void feedbackValue(final int value);
     36     }
     37 
     38     private final int mValueFormatResId;
     39     private final int mMaxValue;
     40     private final int mMinValue;
     41     private final int mStepValue;
     42 
     43     private TextView mValueView;
     44     private SeekBar mSeekBar;
     45 
     46     private ValueProxy mValueProxy;
     47 
     48     public SeekBarDialogPreference(final Context context, final AttributeSet attrs) {
     49         super(context, attrs);
     50         final TypedArray a = context.obtainStyledAttributes(
     51                 attrs, R.styleable.SeekBarDialogPreference, 0, 0);
     52         mValueFormatResId = a.getResourceId(R.styleable.SeekBarDialogPreference_valueFormatText, 0);
     53         mMaxValue = a.getInt(R.styleable.SeekBarDialogPreference_maxValue, 0);
     54         mMinValue = a.getInt(R.styleable.SeekBarDialogPreference_minValue, 0);
     55         mStepValue = a.getInt(R.styleable.SeekBarDialogPreference_stepValue, 0);
     56         a.recycle();
     57         setDialogLayoutResource(R.layout.seek_bar_dialog);
     58     }
     59 
     60     public void setInterface(final ValueProxy proxy) {
     61         mValueProxy = proxy;
     62         setSummary(getValueText(clipValue(proxy.readValue(getKey()))));
     63     }
     64 
     65     private String getValueText(final int value) {
     66         if (mValueFormatResId == 0) {
     67             return Integer.toString(value);
     68         } else {
     69             return getContext().getString(mValueFormatResId, value);
     70         }
     71     }
     72 
     73     @Override
     74     protected View onCreateDialogView() {
     75         final View view = super.onCreateDialogView();
     76         mSeekBar = (SeekBar)view.findViewById(R.id.seek_bar_dialog_bar);
     77         mSeekBar.setMax(mMaxValue - mMinValue);
     78         mSeekBar.setOnSeekBarChangeListener(this);
     79         mValueView = (TextView)view.findViewById(R.id.seek_bar_dialog_value);
     80         return view;
     81     }
     82 
     83     private int getProgressFromValue(final int value) {
     84         return value - mMinValue;
     85     }
     86 
     87     private int getValueFromProgress(final int progress) {
     88         return progress + mMinValue;
     89     }
     90 
     91     private int clipValue(final int value) {
     92         final int clippedValue = Math.min(mMaxValue, Math.max(mMinValue, value));
     93         if (mStepValue <= 1) {
     94             return clippedValue;
     95         }
     96         return clippedValue - (clippedValue % mStepValue);
     97     }
     98 
     99     private int getClippedValueFromProgress(final int progress) {
    100         return clipValue(getValueFromProgress(progress));
    101     }
    102 
    103     private void setValue(final int value, final boolean fromUser) {
    104         mValueView.setText(getValueText(value));
    105         if (!fromUser) {
    106             mSeekBar.setProgress(getProgressFromValue(value));
    107         }
    108     }
    109 
    110     @Override
    111     protected void onBindDialogView(final View view) {
    112         setValue(clipValue(mValueProxy.readValue(getKey())), false /* fromUser */);
    113     }
    114 
    115     @Override
    116     protected void onPrepareDialogBuilder(final AlertDialog.Builder builder) {
    117         builder.setPositiveButton(android.R.string.ok, this)
    118             .setNegativeButton(android.R.string.cancel, this)
    119             .setNeutralButton(R.string.button_default, this);
    120     }
    121 
    122     @Override
    123     public void onClick(final DialogInterface dialog, final int which) {
    124         super.onClick(dialog, which);
    125         if (which == DialogInterface.BUTTON_NEUTRAL) {
    126             setValue(clipValue(mValueProxy.readDefaultValue(getKey())), false /* fromUser */);
    127         }
    128         if (which != DialogInterface.BUTTON_NEGATIVE) {
    129             setSummary(mValueView.getText());
    130             mValueProxy.writeValue(getClippedValueFromProgress(mSeekBar.getProgress()), getKey());
    131         }
    132     }
    133 
    134     @Override
    135     public void onProgressChanged(final SeekBar seekBar, final int progress,
    136             final boolean fromUser) {
    137         setValue(getClippedValueFromProgress(progress), fromUser);
    138     }
    139 
    140     @Override
    141     public void onStartTrackingTouch(final SeekBar seekBar) {}
    142 
    143     @Override
    144     public void onStopTrackingTouch(final SeekBar seekBar) {
    145         mValueProxy.feedbackValue(getClippedValueFromProgress(seekBar.getProgress()));
    146     }
    147 }
    148