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 {
readValue(final String key)34         public int readValue(final String key);
readDefaultValue(final String key)35         public int readDefaultValue(final String key);
writeValue(final int value, final String key)36         public void writeValue(final int value, final String key);
writeDefaultValue(final String key)37         public void writeDefaultValue(final String key);
getValueText(final int value)38         public String getValueText(final int value);
feedbackValue(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 
SeekBarDialogPreference(final Context context, final AttributeSet attrs)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 
setInterface(final ValueProxy proxy)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
onCreateDialogView()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 
getProgressFromValue(final int value)78     private int getProgressFromValue(final int value) {
79         return value - mMinValue;
80     }
81 
getValueFromProgress(final int progress)82     private int getValueFromProgress(final int progress) {
83         return progress + mMinValue;
84     }
85 
clipValue(final int value)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 
getClippedValueFromProgress(final int progress)94     private int getClippedValueFromProgress(final int progress) {
95         return clipValue(getValueFromProgress(progress));
96     }
97 
98     @Override
onBindDialogView(final View view)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
onPrepareDialogBuilder(final AlertDialog.Builder builder)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
onClick(final DialogInterface dialog, final int which)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
onProgressChanged(final SeekBar seekBar, final int progress, final boolean fromUser)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
onStartTrackingTouch(final SeekBar seekBar)141     public void onStartTrackingTouch(final SeekBar seekBar) {}
142 
143     @Override
onStopTrackingTouch(final SeekBar seekBar)144     public void onStopTrackingTouch(final SeekBar seekBar) {
145         mValueProxy.feedbackValue(getClippedValueFromProgress(seekBar.getProgress()));
146     }
147 }
148