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/*
* Copyright (C) 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.systemui.model;
import static android.view.Display.DEFAULT_DISPLAY;
import android.annotation.NonNull;
import android.util.Log;
import com.android.systemui.Dumpable;
import com.android.systemui.dagger.SysUISingleton;
import com.android.systemui.shared.system.QuickStepContract;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Contains sysUi state flags and notifies registered
* listeners whenever changes happen.
*/
@SysUISingleton
public class SysUiState implements Dumpable {
private static final String TAG = SysUiState.class.getSimpleName();
public static final boolean DEBUG = false;
private @QuickStepContract.SystemUiStateFlags int mFlags;
private final List<SysUiStateCallback> mCallbacks = new ArrayList<>();
private int mFlagsToSet = 0;
private int mFlagsToClear = 0;
/**
* Add listener to be notified of changes made to SysUI state.
* The callback will also be called as part of this function.
*/
public void addCallback(@NonNull SysUiStateCallback callback) {
mCallbacks.add(callback);
callback.onSystemUiStateChanged(mFlags);
}
/** Callback will no longer receive events on state change */
public void removeCallback(@NonNull SysUiStateCallback callback) {
mCallbacks.remove(callback);
}
/** Returns the current sysui state flags. */
public int getFlags() {
return mFlags;
}
/** Methods to this call can be chained together before calling {@link #commitUpdate(int)}. */
public SysUiState setFlag(int flag, boolean enabled) {
if (enabled) {
mFlagsToSet |= flag;
} else {
mFlagsToClear |= flag;
}
return this;
}
/** Call to save all the flags updated from {@link #setFlag(int, boolean)}. */
public void commitUpdate(int displayId) {
updateFlags(displayId);
mFlagsToSet = 0;
mFlagsToClear = 0;
}
private void updateFlags(int displayId) {
if (displayId != DEFAULT_DISPLAY) {
// Ignore non-default displays for now
Log.w(TAG, "Ignoring flag update for display: " + displayId, new Throwable());
return;
}
int newState = mFlags;
newState |= mFlagsToSet;
newState &= ~mFlagsToClear;
notifyAndSetSystemUiStateChanged(newState, mFlags);
}
/** Notify all those who are registered that the state has changed. */
private void notifyAndSetSystemUiStateChanged(int newFlags, int oldFlags) {
if (DEBUG) {
Log.d(TAG, "SysUiState changed: old=" + oldFlags + " new=" + newFlags);
}
if (newFlags != oldFlags) {
mCallbacks.forEach(callback -> callback.onSystemUiStateChanged(newFlags));
mFlags = newFlags;
}
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println("SysUiState state:");
pw.print(" mSysUiStateFlags="); pw.println(mFlags);
pw.println(" " + QuickStepContract.getSystemUiStateString(mFlags));
pw.print(" backGestureDisabled=");
pw.println(QuickStepContract.isBackGestureDisabled(mFlags));
pw.print(" assistantGestureDisabled=");
pw.println(QuickStepContract.isAssistantGestureDisabled(mFlags));
}
/** Callback to be notified whenever system UI state flags are changed. */
public interface SysUiStateCallback{
/** To be called when any SysUiStateFlag gets updated */
void onSystemUiStateChanged(@QuickStepContract.SystemUiStateFlags int sysUiFlags);
}
}
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