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 */
16
17package com.android.settings;
18
19import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
20
21import android.app.ActivityManagerNative;
22import android.app.Dialog;
23import android.app.admin.DevicePolicyManager;
24import android.content.BroadcastReceiver;
25import android.content.ContentResolver;
26import android.content.Context;
27import android.content.Intent;
28import android.content.IntentFilter;
29import android.content.res.Configuration;
30import android.content.res.Resources;
31import android.hardware.display.DisplayManager;
32import android.hardware.display.WifiDisplay;
33import android.hardware.display.WifiDisplayStatus;
34import android.os.Bundle;
35import android.os.RemoteException;
36import android.preference.CheckBoxPreference;
37import android.preference.ListPreference;
38import android.preference.Preference;
39import android.preference.Preference.OnPreferenceClickListener;
40import android.preference.PreferenceScreen;
41import android.provider.Settings;
42import android.provider.Settings.SettingNotFoundException;
43import android.util.AttributeSet;
44import android.util.Log;
45
46import com.android.internal.view.RotationPolicy;
47import com.android.settings.DreamSettings;
48
49import java.util.ArrayList;
50
51public class DisplaySettings extends SettingsPreferenceFragment implements
52        Preference.OnPreferenceChangeListener, OnPreferenceClickListener {
53    private static final String TAG = "DisplaySettings";
54
55    /** If there is no setting in the provider, use this. */
56    private static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;
57
58    private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
59    private static final String KEY_ACCELEROMETER = "accelerometer";
60    private static final String KEY_FONT_SIZE = "font_size";
61    private static final String KEY_NOTIFICATION_PULSE = "notification_pulse";
62    private static final String KEY_SCREEN_SAVER = "screensaver";
63    private static final String KEY_WIFI_DISPLAY = "wifi_display";
64
65    private static final int DLG_GLOBAL_CHANGE_WARNING = 1;
66
67    private DisplayManager mDisplayManager;
68
69    private CheckBoxPreference mAccelerometer;
70    private WarnedListPreference mFontSizePref;
71    private CheckBoxPreference mNotificationPulse;
72
73    private final Configuration mCurConfig = new Configuration();
74
75    private ListPreference mScreenTimeoutPreference;
76    private Preference mScreenSaverPreference;
77
78    private WifiDisplayStatus mWifiDisplayStatus;
79    private Preference mWifiDisplayPreference;
80
81    private final RotationPolicy.RotationPolicyListener mRotationPolicyListener =
82            new RotationPolicy.RotationPolicyListener() {
83        @Override
84        public void onChange() {
85            updateAccelerometerRotationCheckbox();
86        }
87    };
88
89    @Override
90    public void onCreate(Bundle savedInstanceState) {
91        super.onCreate(savedInstanceState);
92        ContentResolver resolver = getActivity().getContentResolver();
93
94        addPreferencesFromResource(R.xml.display_settings);
95
96        mAccelerometer = (CheckBoxPreference) findPreference(KEY_ACCELEROMETER);
97        mAccelerometer.setPersistent(false);
98        if (RotationPolicy.isRotationLockToggleSupported(getActivity())) {
99            // If rotation lock is supported, then we do not provide this option in
100            // Display settings.  However, is still available in Accessibility settings.
101            getPreferenceScreen().removePreference(mAccelerometer);
102        }
103
104        mScreenSaverPreference = findPreference(KEY_SCREEN_SAVER);
105        if (mScreenSaverPreference != null
106                && getResources().getBoolean(
107                        com.android.internal.R.bool.config_dreamsSupported) == false) {
108            getPreferenceScreen().removePreference(mScreenSaverPreference);
109        }
110
111        mScreenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
112        final long currentTimeout = Settings.System.getLong(resolver, SCREEN_OFF_TIMEOUT,
113                FALLBACK_SCREEN_TIMEOUT_VALUE);
114        mScreenTimeoutPreference.setValue(String.valueOf(currentTimeout));
115        mScreenTimeoutPreference.setOnPreferenceChangeListener(this);
116        disableUnusableTimeouts(mScreenTimeoutPreference);
117        updateTimeoutPreferenceDescription(currentTimeout);
118
119        mFontSizePref = (WarnedListPreference) findPreference(KEY_FONT_SIZE);
120        mFontSizePref.setOnPreferenceChangeListener(this);
121        mFontSizePref.setOnPreferenceClickListener(this);
122        mNotificationPulse = (CheckBoxPreference) findPreference(KEY_NOTIFICATION_PULSE);
123        if (mNotificationPulse != null
124                && getResources().getBoolean(
125                        com.android.internal.R.bool.config_intrusiveNotificationLed) == false) {
126            getPreferenceScreen().removePreference(mNotificationPulse);
127        } else {
128            try {
129                mNotificationPulse.setChecked(Settings.System.getInt(resolver,
130                        Settings.System.NOTIFICATION_LIGHT_PULSE) == 1);
131                mNotificationPulse.setOnPreferenceChangeListener(this);
132            } catch (SettingNotFoundException snfe) {
133                Log.e(TAG, Settings.System.NOTIFICATION_LIGHT_PULSE + " not found");
134            }
135        }
136
137        mDisplayManager = (DisplayManager)getActivity().getSystemService(
138                Context.DISPLAY_SERVICE);
139        mWifiDisplayStatus = mDisplayManager.getWifiDisplayStatus();
140        mWifiDisplayPreference = (Preference)findPreference(KEY_WIFI_DISPLAY);
141        if (mWifiDisplayStatus.getFeatureState()
142                == WifiDisplayStatus.FEATURE_STATE_UNAVAILABLE) {
143            getPreferenceScreen().removePreference(mWifiDisplayPreference);
144            mWifiDisplayPreference = null;
145        }
146    }
147
148    private void updateTimeoutPreferenceDescription(long currentTimeout) {
149        ListPreference preference = mScreenTimeoutPreference;
150        String summary;
151        if (currentTimeout < 0) {
152            // Unsupported value
153            summary = "";
154        } else {
155            final CharSequence[] entries = preference.getEntries();
156            final CharSequence[] values = preference.getEntryValues();
157            if (entries == null || entries.length == 0) {
158                summary = "";
159            } else {
160                int best = 0;
161                for (int i = 0; i < values.length; i++) {
162                    long timeout = Long.parseLong(values[i].toString());
163                    if (currentTimeout >= timeout) {
164                        best = i;
165                    }
166                }
167                summary = preference.getContext().getString(R.string.screen_timeout_summary,
168                        entries[best]);
169            }
170        }
171        preference.setSummary(summary);
172    }
173
174    private void disableUnusableTimeouts(ListPreference screenTimeoutPreference) {
175        final DevicePolicyManager dpm =
176                (DevicePolicyManager) getActivity().getSystemService(
177                Context.DEVICE_POLICY_SERVICE);
178        final long maxTimeout = dpm != null ? dpm.getMaximumTimeToLock(null) : 0;
179        if (maxTimeout == 0) {
180            return; // policy not enforced
181        }
182        final CharSequence[] entries = screenTimeoutPreference.getEntries();
183        final CharSequence[] values = screenTimeoutPreference.getEntryValues();
184        ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
185        ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
186        for (int i = 0; i < values.length; i++) {
187            long timeout = Long.parseLong(values[i].toString());
188            if (timeout <= maxTimeout) {
189                revisedEntries.add(entries[i]);
190                revisedValues.add(values[i]);
191            }
192        }
193        if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
194            screenTimeoutPreference.setEntries(
195                    revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
196            screenTimeoutPreference.setEntryValues(
197                    revisedValues.toArray(new CharSequence[revisedValues.size()]));
198            final int userPreference = Integer.parseInt(screenTimeoutPreference.getValue());
199            if (userPreference <= maxTimeout) {
200                screenTimeoutPreference.setValue(String.valueOf(userPreference));
201            } else {
202                // There will be no highlighted selection since nothing in the list matches
203                // maxTimeout. The user can still select anything less than maxTimeout.
204                // TODO: maybe append maxTimeout to the list and mark selected.
205            }
206        }
207        screenTimeoutPreference.setEnabled(revisedEntries.size() > 0);
208    }
209
210    int floatToIndex(float val) {
211        String[] indices = getResources().getStringArray(R.array.entryvalues_font_size);
212        float lastVal = Float.parseFloat(indices[0]);
213        for (int i=1; i<indices.length; i++) {
214            float thisVal = Float.parseFloat(indices[i]);
215            if (val < (lastVal + (thisVal-lastVal)*.5f)) {
216                return i-1;
217            }
218            lastVal = thisVal;
219        }
220        return indices.length-1;
221    }
222
223    public void readFontSizePreference(ListPreference pref) {
224        try {
225            mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());
226        } catch (RemoteException e) {
227            Log.w(TAG, "Unable to retrieve font size");
228        }
229
230        // mark the appropriate item in the preferences list
231        int index = floatToIndex(mCurConfig.fontScale);
232        pref.setValueIndex(index);
233
234        // report the current size in the summary text
235        final Resources res = getResources();
236        String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);
237        pref.setSummary(String.format(res.getString(R.string.summary_font_size),
238                fontSizeNames[index]));
239    }
240
241    @Override
242    public void onResume() {
243        super.onResume();
244
245        RotationPolicy.registerRotationPolicyListener(getActivity(),
246                mRotationPolicyListener);
247
248        if (mWifiDisplayPreference != null) {
249            getActivity().registerReceiver(mReceiver, new IntentFilter(
250                    DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED));
251            mWifiDisplayStatus = mDisplayManager.getWifiDisplayStatus();
252        }
253
254        updateState();
255    }
256
257    @Override
258    public void onPause() {
259        super.onPause();
260
261        RotationPolicy.unregisterRotationPolicyListener(getActivity(),
262                mRotationPolicyListener);
263
264        if (mWifiDisplayPreference != null) {
265            getActivity().unregisterReceiver(mReceiver);
266        }
267    }
268
269    @Override
270    public Dialog onCreateDialog(int dialogId) {
271        if (dialogId == DLG_GLOBAL_CHANGE_WARNING) {
272            return Utils.buildGlobalChangeWarningDialog(getActivity(),
273                    R.string.global_font_change_title,
274                    new Runnable() {
275                        public void run() {
276                            mFontSizePref.click();
277                        }
278                    });
279        }
280        return null;
281    }
282
283    private void updateState() {
284        updateAccelerometerRotationCheckbox();
285        readFontSizePreference(mFontSizePref);
286        updateScreenSaverSummary();
287        updateWifiDisplaySummary();
288    }
289
290    private void updateScreenSaverSummary() {
291        if (mScreenSaverPreference != null) {
292            mScreenSaverPreference.setSummary(
293                    DreamSettings.getSummaryTextWithDreamName(getActivity()));
294        }
295    }
296
297    private void updateWifiDisplaySummary() {
298        if (mWifiDisplayPreference != null) {
299            switch (mWifiDisplayStatus.getFeatureState()) {
300                case WifiDisplayStatus.FEATURE_STATE_OFF:
301                    mWifiDisplayPreference.setSummary(R.string.wifi_display_summary_off);
302                    break;
303                case WifiDisplayStatus.FEATURE_STATE_ON:
304                    mWifiDisplayPreference.setSummary(R.string.wifi_display_summary_on);
305                    break;
306                case WifiDisplayStatus.FEATURE_STATE_DISABLED:
307                default:
308                    mWifiDisplayPreference.setSummary(R.string.wifi_display_summary_disabled);
309                    break;
310            }
311        }
312    }
313
314    private void updateAccelerometerRotationCheckbox() {
315        if (getActivity() == null) return;
316
317        mAccelerometer.setChecked(!RotationPolicy.isRotationLocked(getActivity()));
318    }
319
320    public void writeFontSizePreference(Object objValue) {
321        try {
322            mCurConfig.fontScale = Float.parseFloat(objValue.toString());
323            ActivityManagerNative.getDefault().updatePersistentConfiguration(mCurConfig);
324        } catch (RemoteException e) {
325            Log.w(TAG, "Unable to save font size");
326        }
327    }
328
329    @Override
330    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
331        if (preference == mAccelerometer) {
332            RotationPolicy.setRotationLockForAccessibility(
333                    getActivity(), !mAccelerometer.isChecked());
334        } else if (preference == mNotificationPulse) {
335            boolean value = mNotificationPulse.isChecked();
336            Settings.System.putInt(getContentResolver(), Settings.System.NOTIFICATION_LIGHT_PULSE,
337                    value ? 1 : 0);
338            return true;
339        }
340        return super.onPreferenceTreeClick(preferenceScreen, preference);
341    }
342
343    public boolean onPreferenceChange(Preference preference, Object objValue) {
344        final String key = preference.getKey();
345        if (KEY_SCREEN_TIMEOUT.equals(key)) {
346            int value = Integer.parseInt((String) objValue);
347            try {
348                Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);
349                updateTimeoutPreferenceDescription(value);
350            } catch (NumberFormatException e) {
351                Log.e(TAG, "could not persist screen timeout setting", e);
352            }
353        }
354        if (KEY_FONT_SIZE.equals(key)) {
355            writeFontSizePreference(objValue);
356        }
357
358        return true;
359    }
360
361    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
362        @Override
363        public void onReceive(Context context, Intent intent) {
364            if (intent.getAction().equals(DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED)) {
365                mWifiDisplayStatus = (WifiDisplayStatus)intent.getParcelableExtra(
366                        DisplayManager.EXTRA_WIFI_DISPLAY_STATUS);
367                updateWifiDisplaySummary();
368            }
369        }
370    };
371
372    @Override
373    public boolean onPreferenceClick(Preference preference) {
374        if (preference == mFontSizePref) {
375            if (Utils.hasMultipleUsers(getActivity())) {
376                showDialog(DLG_GLOBAL_CHANGE_WARNING);
377                return true;
378            } else {
379                mFontSizePref.click();
380            }
381        }
382        return false;
383    }
384}
385