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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.display;
import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
import static com.android.settings.display.ScreenTimeoutSettings.FALLBACK_SCREEN_TIMEOUT_VALUE;
import android.app.admin.DevicePolicyManager;
import android.content.Context;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import androidx.preference.Preference;
import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;
import com.android.settingslib.RestrictedLockUtils;
import com.android.settingslib.RestrictedLockUtilsInternal;
import com.android.settingslib.RestrictedPreference;
/**
* The controller of {@link ScreenTimeoutSettings}.
*/
public class ScreenTimeoutPreferenceController extends BasePreferenceController {
public static String PREF_NAME = "screen_timeout";
private final CharSequence[] mTimeoutEntries;
private final CharSequence[] mTimeoutValues;
public ScreenTimeoutPreferenceController(Context context, String key) {
super(context, key);
mTimeoutEntries = context.getResources().getStringArray(R.array.screen_timeout_entries);
mTimeoutValues = context.getResources().getStringArray(R.array.screen_timeout_values);
}
@Override
public int getAvailabilityStatus() {
return AVAILABLE;
}
@Override
public void updateState(Preference preference) {
final long maxTimeout = getMaxScreenTimeout();
final RestrictedLockUtils.EnforcedAdmin admin = getPreferenceDisablingAdmin(maxTimeout);
if (admin != null) {
preference.setEnabled(false);
preference.setSummary(mContext.getText(R.string.disabled_by_policy_title));
((RestrictedPreference) preference).setDisabledByAdmin(admin);
} else {
preference.setSummary(getTimeoutSummary(maxTimeout));
}
}
private CharSequence getTimeoutSummary(long maxTimeout) {
final long currentTimeout = getCurrentScreenTimeout();
final CharSequence description = getTimeoutDescription(currentTimeout, maxTimeout);
return mContext.getString(R.string.screen_timeout_summary, description);
}
private Long getMaxScreenTimeout() {
if (RestrictedLockUtilsInternal.checkIfMaximumTimeToLockIsSet(mContext) != null) {
final DevicePolicyManager dpm = mContext.getSystemService(DevicePolicyManager.class);
if (dpm != null) {
return dpm.getMaximumTimeToLock(null /* admin */, UserHandle.myUserId());
}
}
return Long.MAX_VALUE;
}
/**
* Returns the admin that causes the preference to be disabled completely. This could be due to
* either an admin that has set the {@link UserManager.DISALLOW_CONFIG_SCREEN_TIMEOUT}
* restriction, or an admin that has set a very small MaximumTimeToLock timeout resulting in
* no possible options for the user.
*/
private RestrictedLockUtils.EnforcedAdmin getPreferenceDisablingAdmin(long maxTimeout) {
final DevicePolicyManager dpm = mContext.getSystemService(DevicePolicyManager.class);
RestrictedLockUtils.EnforcedAdmin admin = null;
if (dpm != null) {
admin = RestrictedLockUtilsInternal.checkIfRestrictionEnforced(
mContext, UserManager.DISALLOW_CONFIG_SCREEN_TIMEOUT,
UserHandle.myUserId());
if (admin == null && getLargestTimeout(maxTimeout) == null) {
admin = RestrictedLockUtilsInternal.checkIfMaximumTimeToLockIsSet(mContext);
}
}
return admin;
}
private long getCurrentScreenTimeout() {
return Settings.System.getLong(mContext.getContentResolver(),
SCREEN_OFF_TIMEOUT, FALLBACK_SCREEN_TIMEOUT_VALUE);
}
private CharSequence getTimeoutDescription(long currentTimeout, long maxTimeout) {
if (currentTimeout < 0 || mTimeoutEntries == null || mTimeoutValues == null
|| mTimeoutValues.length != mTimeoutEntries.length) {
return null;
}
if (currentTimeout > maxTimeout) {
// The selected time out value is longer than the max timeout allowed by the admin.
// Select the largest value from the list by default.
return getLargestTimeout(maxTimeout);
} else {
return getCurrentTimeout(currentTimeout);
}
}
private CharSequence getCurrentTimeout(long currentTimeout) {
for (int i = 0; i < mTimeoutValues.length; i++) {
if (currentTimeout == Long.parseLong(mTimeoutValues[i].toString())) {
return mTimeoutEntries[i];
}
}
return null;
}
private CharSequence getLargestTimeout(long maxTimeout) {
CharSequence largestTimeout = null;
// The list of timeouts is sorted
for (int i = 0; i < mTimeoutValues.length; ++i) {
if (Long.parseLong(mTimeoutValues[i].toString()) <= maxTimeout) {
largestTimeout = mTimeoutEntries[i];
}
}
return largestTimeout;
}
}
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