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/*
* Copyright 2019 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.development;
import android.content.Context;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.os.ServiceManager;
import androidx.annotation.VisibleForTesting;
import androidx.preference.Preference;
import androidx.preference.SwitchPreference;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.development.DeveloperOptionsPreferenceController;
/**
* Controller class for controlling the refresh rate overlay on SurfaceFlinger
*/
public class ShowRefreshRatePreferenceController extends DeveloperOptionsPreferenceController
implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
private static final String SHOW_REFRESH_RATE_KEY = "show_refresh_rate";
private static final int SETTING_VALUE_QUERY = 2;
private static final int SETTING_VALUE_ON = 1;
private static final int SETTING_VALUE_OFF = 0;
@VisibleForTesting
static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger";
@VisibleForTesting
static final int SURFACE_FLINGER_CODE = 1034;
private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer";
private final IBinder mSurfaceFlinger;
public ShowRefreshRatePreferenceController(Context context) {
super(context);
mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY);
}
@Override
public String getPreferenceKey() {
return SHOW_REFRESH_RATE_KEY;
}
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
final boolean isEnabled = (Boolean) newValue;
writeShowRefreshRateSetting(isEnabled);
return true;
}
@Override
public void updateState(Preference preference) {
updateShowRefreshRateSetting();
}
@Override
protected void onDeveloperOptionsSwitchDisabled() {
super.onDeveloperOptionsSwitchDisabled();
final SwitchPreference preference = (SwitchPreference) mPreference;
if (preference.isChecked()) {
// Writing false to the preference when the setting is already off will have a
// side effect of turning on the preference that we wish to avoid
writeShowRefreshRateSetting(false);
preference.setChecked(false);
}
}
@VisibleForTesting
void updateShowRefreshRateSetting() {
// magic communication with surface flinger.
try {
if (mSurfaceFlinger != null) {
final Parcel data = Parcel.obtain();
final Parcel reply = Parcel.obtain();
data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
data.writeInt(SETTING_VALUE_QUERY);
mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data, reply, 0 /* flags */);
final boolean enabled = reply.readBoolean();
((SwitchPreference) mPreference).setChecked(enabled);
reply.recycle();
data.recycle();
}
} catch (RemoteException ex) {
// intentional no-op
}
}
@VisibleForTesting
void writeShowRefreshRateSetting(boolean isEnabled) {
try {
if (mSurfaceFlinger != null) {
final Parcel data = Parcel.obtain();
data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
final int showRefreshRate = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF;
data.writeInt(showRefreshRate);
mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data,
null /* reply */, 0 /* flags */);
data.recycle();
}
} catch (RemoteException ex) {
// intentional no-op
}
updateShowRefreshRateSetting();
}
}
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