| /* |
| * 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.shared.system.QuickStepContract; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.inject.Singleton; |
| |
| /** |
| * Contains sysUi state flags and notifies registered |
| * listeners whenever changes happen. |
| */ |
| @Singleton |
| public class SysUiState implements Dumpable { |
| |
| private static final String TAG = SysUiState.class.getSimpleName(); |
| public static final boolean DEBUG = true; |
| |
| 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); |
| } |
| |
| /** 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); |
| } |
| } |
| |
| |