1/*
2 * Copyright (C) 2010 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 */
16package com.android.quicksearchbox.preferences;
17
18import com.android.quicksearchbox.ShortcutRepository;
19import com.android.quicksearchbox.util.Consumer;
20import com.android.quicksearchbox.util.Consumers;
21
22import android.os.Handler;
23import android.preference.Preference;
24import android.util.Log;
25
26/**
27 * Logic behind the 'clear shortcuts' preference.
28 */
29public class ClearShortcutsController implements PreferenceController {
30
31    public static final String CLEAR_SHORTCUTS_PREF = "clear_shortcuts";
32
33    private static final boolean DBG = false;
34    private static final String TAG = "QSB.ClearShortcutsController";
35
36    private final ShortcutRepository mShortcuts;
37    private final Handler mHandler = new Handler();
38
39    private OkCancelPreference mClearShortcutsPreference;
40
41
42    public ClearShortcutsController(ShortcutRepository shortcuts) {
43        mShortcuts = shortcuts;
44    }
45
46    @Override
47    public void handlePreference(Preference p) {
48        mClearShortcutsPreference = (OkCancelPreference) p;
49        mClearShortcutsPreference.setListener(new OkCancelPreference.Listener() {
50            @Override
51            public void onDialogClosed(boolean okClicked) {
52                if (okClicked) {
53                    clearShortcuts();
54                }
55            }
56        });
57    }
58
59    public void onCreateComplete() {
60    }
61
62    public void onStop() {
63    }
64
65    public void onDestroy() {
66    }
67
68    @Override
69    public void onResume() {
70        updateClearShortcutsPreference();
71    }
72
73    /**
74     * Enables/disables the "Clear search shortcuts" preference depending
75     * on whether there is any search history.
76     */
77    private void updateClearShortcutsPreference() {
78        mShortcuts.hasHistory(Consumers.createAsyncConsumer(mHandler, new Consumer<Boolean>() {
79            @Override
80            public boolean consume(Boolean hasHistory) {
81                if (DBG) Log.d(TAG, "hasHistory()=" + hasHistory);
82                mClearShortcutsPreference.setEnabled(hasHistory);
83                return true;
84            }
85        }));
86    }
87
88    private void clearShortcuts() {
89        Log.i(TAG, "Clearing shortcuts...");
90        mShortcuts.clearHistory();
91        mClearShortcutsPreference.setEnabled(false);
92    }
93}
94