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