1/*
2 * Copyright (C) 2016 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 android.support.v7.preference;
18
19import android.content.DialogInterface;
20import android.os.Bundle;
21import android.support.annotation.NonNull;
22import android.support.v7.app.AlertDialog;
23import android.support.v7.preference.internal.AbstractMultiSelectListPreference;
24
25import java.util.ArrayList;
26import java.util.HashSet;
27import java.util.Set;
28
29public class MultiSelectListPreferenceDialogFragmentCompat extends PreferenceDialogFragmentCompat {
30
31    private static final String SAVE_STATE_VALUES =
32            "MultiSelectListPreferenceDialogFragmentCompat.values";
33    private static final String SAVE_STATE_CHANGED =
34            "MultiSelectListPreferenceDialogFragmentCompat.changed";
35    private static final String SAVE_STATE_ENTRIES =
36            "MultiSelectListPreferenceDialogFragmentCompat.entries";
37    private static final String SAVE_STATE_ENTRY_VALUES =
38            "MultiSelectListPreferenceDialogFragmentCompat.entryValues";
39
40    private Set<String> mNewValues = new HashSet<>();
41    private boolean mPreferenceChanged;
42    private CharSequence[] mEntries;
43    private CharSequence[] mEntryValues;
44
45    public static MultiSelectListPreferenceDialogFragmentCompat newInstance(String key) {
46        final MultiSelectListPreferenceDialogFragmentCompat fragment =
47                new MultiSelectListPreferenceDialogFragmentCompat();
48        final Bundle b = new Bundle(1);
49        b.putString(ARG_KEY, key);
50        fragment.setArguments(b);
51        return fragment;
52    }
53
54    @Override
55    public void onCreate(Bundle savedInstanceState) {
56        super.onCreate(savedInstanceState);
57
58        if (savedInstanceState == null) {
59            final AbstractMultiSelectListPreference preference = getListPreference();
60
61            if (preference.getEntries() == null || preference.getEntryValues() == null) {
62                throw new IllegalStateException(
63                        "MultiSelectListPreference requires an entries array and " +
64                                "an entryValues array.");
65            }
66
67            mNewValues.clear();
68            mNewValues.addAll(preference.getValues());
69            mPreferenceChanged = false;
70            mEntries = preference.getEntries();
71            mEntryValues = preference.getEntryValues();
72        } else {
73            mNewValues.clear();
74            mNewValues.addAll(savedInstanceState.getStringArrayList(SAVE_STATE_VALUES));
75            mPreferenceChanged = savedInstanceState.getBoolean(SAVE_STATE_CHANGED, false);
76            mEntries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES);
77            mEntryValues = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRY_VALUES);
78        }
79    }
80
81    @Override
82    public void onSaveInstanceState(@NonNull Bundle outState) {
83        super.onSaveInstanceState(outState);
84        outState.putStringArrayList(SAVE_STATE_VALUES, new ArrayList<>(mNewValues));
85        outState.putBoolean(SAVE_STATE_CHANGED, mPreferenceChanged);
86        outState.putCharSequenceArray(SAVE_STATE_ENTRIES, mEntries);
87        outState.putCharSequenceArray(SAVE_STATE_ENTRY_VALUES, mEntryValues);
88    }
89
90    private AbstractMultiSelectListPreference getListPreference() {
91        return (AbstractMultiSelectListPreference) getPreference();
92    }
93
94    @Override
95    protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
96        super.onPrepareDialogBuilder(builder);
97
98        final int entryCount = mEntryValues.length;
99        final boolean[] checkedItems = new boolean[entryCount];
100        for (int i = 0; i < entryCount; i++) {
101            checkedItems[i] = mNewValues.contains(mEntryValues[i].toString());
102        }
103        builder.setMultiChoiceItems(mEntries, checkedItems,
104                new DialogInterface.OnMultiChoiceClickListener() {
105                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
106                        if (isChecked) {
107                            mPreferenceChanged |= mNewValues.add(
108                                    mEntryValues[which].toString());
109                        } else {
110                            mPreferenceChanged |= mNewValues.remove(
111                                    mEntryValues[which].toString());
112                        }
113                    }
114                });
115    }
116
117    @Override
118    public void onDialogClosed(boolean positiveResult) {
119        final AbstractMultiSelectListPreference preference = getListPreference();
120        if (positiveResult && mPreferenceChanged) {
121            final Set<String> values = mNewValues;
122            if (preference.callChangeListener(values)) {
123                preference.setValues(values);
124            }
125        }
126        mPreferenceChanged = false;
127    }
128}
129