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/*
* Copyright (C) 2017 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.quickstep;
import android.util.Log;
import android.util.SparseArray;
import com.android.launcher3.config.FeatureFlags;
import java.util.StringJoiner;
import java.util.function.Consumer;
/**
* Utility class to help manage multiple callbacks based on different states.
*/
public class MultiStateCallback {
private static final String TAG = "MultiStateCallback";
public static final boolean DEBUG_STATES = false;
private final SparseArray<Runnable> mCallbacks = new SparseArray<>();
private final SparseArray<Consumer<Boolean>> mStateChangeHandlers = new SparseArray<>();
private final String[] mStateNames;
public MultiStateCallback(String[] stateNames) {
mStateNames = DEBUG_STATES ? stateNames : null;
}
private int mState = 0;
/**
* Adds the provided state flags to the global state and executes any callbacks as a result.
*/
public void setState(int stateFlag) {
if (DEBUG_STATES) {
Log.d(TAG, "[" + System.identityHashCode(this) + "] Adding "
+ convertToFlagNames(stateFlag) + " to " + convertToFlagNames(mState));
}
int oldState = mState;
mState = mState | stateFlag;
int count = mCallbacks.size();
for (int i = 0; i < count; i++) {
int state = mCallbacks.keyAt(i);
if ((mState & state) == state) {
Runnable callback = mCallbacks.valueAt(i);
if (callback != null) {
// Set the callback to null, so that it does not run again.
mCallbacks.setValueAt(i, null);
callback.run();
}
}
}
notifyStateChangeHandlers(oldState);
}
/**
* Adds the provided state flags to the global state and executes any change handlers
* as a result.
*/
public void clearState(int stateFlag) {
if (DEBUG_STATES) {
Log.d(TAG, "[" + System.identityHashCode(this) + "] Removing "
+ convertToFlagNames(stateFlag) + " from " + convertToFlagNames(mState));
}
int oldState = mState;
mState = mState & ~stateFlag;
notifyStateChangeHandlers(oldState);
}
private void notifyStateChangeHandlers(int oldState) {
int count = mStateChangeHandlers.size();
for (int i = 0; i < count; i++) {
int state = mStateChangeHandlers.keyAt(i);
boolean wasOn = (state & oldState) == state;
boolean isOn = (state & mState) == state;
if (wasOn != isOn) {
mStateChangeHandlers.valueAt(i).accept(isOn);
}
}
}
/**
* Sets the callbacks to be run when the provided states are enabled.
* The callback is only run once.
*/
public void addCallback(int stateMask, Runnable callback) {
if (FeatureFlags.IS_DOGFOOD_BUILD && mCallbacks.get(stateMask) != null) {
throw new IllegalStateException("Multiple callbacks on same state");
}
mCallbacks.put(stateMask, callback);
}
/**
* Sets the handler to be called when the provided states are enabled or disabled.
*/
public void addChangeHandler(int stateMask, Consumer<Boolean> handler) {
mStateChangeHandlers.put(stateMask, handler);
}
public int getState() {
return mState;
}
public boolean hasStates(int stateMask) {
return (mState & stateMask) == stateMask;
}
private String convertToFlagNames(int flags) {
StringJoiner joiner = new StringJoiner(", ", "[", " (" + flags + ")]");
for (int i = 0; i < mStateNames.length; i++) {
if ((flags & (1 << i)) != 0) {
joiner.add(mStateNames[i]);
}
}
return joiner.toString();
}
}
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