1/*
2 * Copyright (C) 2009 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
17package com.android.camera;
18
19import android.content.Context;
20import android.content.SharedPreferences;
21import android.content.res.TypedArray;
22import android.util.AttributeSet;
23import android.util.Log;
24import android.util.TypedValue;
25
26import com.android.gallery3d.R;
27
28import java.util.ArrayList;
29import java.util.List;
30
31/**
32 * A type of <code>CameraPreference</code> whose number of possible values
33 * is limited.
34 */
35public class ListPreference extends CameraPreference {
36    private static final String TAG = "ListPreference";
37    private final String mKey;
38    private String mValue;
39    private final CharSequence[] mDefaultValues;
40
41    private CharSequence[] mEntries;
42    private CharSequence[] mEntryValues;
43    private CharSequence[] mLabels;
44    private boolean mLoaded = false;
45
46    public ListPreference(Context context, AttributeSet attrs) {
47        super(context, attrs);
48
49        TypedArray a = context.obtainStyledAttributes(
50                attrs, R.styleable.ListPreference, 0, 0);
51
52        mKey = Util.checkNotNull(
53                a.getString(R.styleable.ListPreference_key));
54
55        // We allow the defaultValue attribute to be a string or an array of
56        // strings. The reason we need multiple default values is that some
57        // of them may be unsupported on a specific platform (for example,
58        // continuous auto-focus). In that case the first supported value
59        // in the array will be used.
60        int attrDefaultValue = R.styleable.ListPreference_defaultValue;
61        TypedValue tv = a.peekValue(attrDefaultValue);
62        if (tv != null && tv.type == TypedValue.TYPE_REFERENCE) {
63            mDefaultValues = a.getTextArray(attrDefaultValue);
64        } else {
65            mDefaultValues = new CharSequence[1];
66            mDefaultValues[0] = a.getString(attrDefaultValue);
67        }
68
69        setEntries(a.getTextArray(R.styleable.ListPreference_entries));
70        setEntryValues(a.getTextArray(
71                R.styleable.ListPreference_entryValues));
72        setLabels(a.getTextArray(
73                R.styleable.ListPreference_labelList));
74        a.recycle();
75    }
76
77    public String getKey() {
78        return mKey;
79    }
80
81    public CharSequence[] getEntries() {
82        return mEntries;
83    }
84
85    public CharSequence[] getEntryValues() {
86        return mEntryValues;
87    }
88
89    public CharSequence[] getLabels() {
90        return mLabels;
91    }
92
93    public void setEntries(CharSequence entries[]) {
94        mEntries = entries == null ? new CharSequence[0] : entries;
95    }
96
97    public void setEntryValues(CharSequence values[]) {
98        mEntryValues = values == null ? new CharSequence[0] : values;
99    }
100
101    public void setLabels(CharSequence labels[]) {
102        mLabels = labels == null ? new CharSequence[0] : labels;
103    }
104
105    public String getValue() {
106        if (!mLoaded) {
107            mValue = getSharedPreferences().getString(mKey,
108                    findSupportedDefaultValue());
109            mLoaded = true;
110        }
111        return mValue;
112    }
113
114    // Find the first value in mDefaultValues which is supported.
115    private String findSupportedDefaultValue() {
116        for (int i = 0; i < mDefaultValues.length; i++) {
117            for (int j = 0; j < mEntryValues.length; j++) {
118                // Note that mDefaultValues[i] may be null (if unspecified
119                // in the xml file).
120                if (mEntryValues[j].equals(mDefaultValues[i])) {
121                    return mDefaultValues[i].toString();
122                }
123            }
124        }
125        return null;
126    }
127
128    public void setValue(String value) {
129        if (findIndexOfValue(value) < 0) throw new IllegalArgumentException();
130        mValue = value;
131        persistStringValue(value);
132    }
133
134    public void setValueIndex(int index) {
135        setValue(mEntryValues[index].toString());
136    }
137
138    public int findIndexOfValue(String value) {
139        for (int i = 0, n = mEntryValues.length; i < n; ++i) {
140            if (Util.equals(mEntryValues[i], value)) return i;
141        }
142        return -1;
143    }
144
145    public int getCurrentIndex() {
146        return findIndexOfValue(getValue());
147    }
148
149    public String getEntry() {
150        return mEntries[findIndexOfValue(getValue())].toString();
151    }
152
153    public String getLabel() {
154        return mLabels[findIndexOfValue(getValue())].toString();
155    }
156
157    protected void persistStringValue(String value) {
158        SharedPreferences.Editor editor = getSharedPreferences().edit();
159        editor.putString(mKey, value);
160        editor.apply();
161    }
162
163    @Override
164    public void reloadValue() {
165        this.mLoaded = false;
166    }
167
168    public void filterUnsupported(List<String> supported) {
169        ArrayList<CharSequence> entries = new ArrayList<CharSequence>();
170        ArrayList<CharSequence> entryValues = new ArrayList<CharSequence>();
171        for (int i = 0, len = mEntryValues.length; i < len; i++) {
172            if (supported.indexOf(mEntryValues[i].toString()) >= 0) {
173                entries.add(mEntries[i]);
174                entryValues.add(mEntryValues[i]);
175            }
176        }
177        int size = entries.size();
178        mEntries = entries.toArray(new CharSequence[size]);
179        mEntryValues = entryValues.toArray(new CharSequence[size]);
180    }
181
182    public void filterDuplicated() {
183        ArrayList<CharSequence> entries = new ArrayList<CharSequence>();
184        ArrayList<CharSequence> entryValues = new ArrayList<CharSequence>();
185        for (int i = 0, len = mEntryValues.length; i < len; i++) {
186            if (!entries.contains(mEntries[i])) {
187                entries.add(mEntries[i]);
188                entryValues.add(mEntryValues[i]);
189            }
190        }
191        int size = entries.size();
192        mEntries = entries.toArray(new CharSequence[size]);
193        mEntryValues = entryValues.toArray(new CharSequence[size]);
194    }
195
196    public void print() {
197        Log.v(TAG, "Preference key=" + getKey() + ". value=" + getValue());
198        for (int i = 0; i < mEntryValues.length; i++) {
199            Log.v(TAG, "entryValues[" + i + "]=" + mEntryValues[i]);
200        }
201    }
202}
203