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/*
* Copyright (C) 2022 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.touch;
import android.graphics.Rect;
import android.graphics.Region;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewRootImpl;
import androidx.concurrent.futures.CallbackToFutureAdapter;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.HashMap;
import java.util.HashSet;
import java.util.concurrent.Executor;
/**
* {@link TouchInsetManager} handles setting the touchable inset regions for a given View. This
* is useful for passing through touch events for all but select areas.
*/
public class TouchInsetManager {
/**
* {@link TouchInsetSession} provides an individualized session with the
* {@link TouchInsetManager}, linking any action to the client.
*/
public static class TouchInsetSession {
private final TouchInsetManager mManager;
private final HashSet<View> mTrackedViews;
private final Executor mExecutor;
private final View.OnLayoutChangeListener mOnLayoutChangeListener =
(v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom)
-> updateTouchRegion();
/**
* Default constructor
* @param manager The parent {@link TouchInsetManager} which will be affected by actions on
* this session.
* @param rootView The parent of views that will be tracked.
* @param executor An executor for marshalling operations.
*/
TouchInsetSession(TouchInsetManager manager, Executor executor) {
mManager = manager;
mTrackedViews = new HashSet<>();
mExecutor = executor;
}
/**
* Adds a descendant of the root view to be tracked.
* @param view {@link View} to be tracked.
*/
public void addViewToTracking(View view) {
mExecutor.execute(() -> {
mTrackedViews.add(view);
view.addOnLayoutChangeListener(mOnLayoutChangeListener);
updateTouchRegion();
});
}
/**
* Removes a view from further tracking
* @param view {@link View} to be removed.
*/
public void removeViewFromTracking(View view) {
mExecutor.execute(() -> {
mTrackedViews.remove(view);
view.removeOnLayoutChangeListener(mOnLayoutChangeListener);
updateTouchRegion();
});
}
private void updateTouchRegion() {
final Region cumulativeRegion = Region.obtain();
mTrackedViews.stream().forEach(view -> {
if (!view.isAttachedToWindow()) {
return;
}
final Rect boundaries = new Rect();
view.getDrawingRect(boundaries);
((ViewGroup) view.getRootView()).offsetDescendantRectToMyCoords(view, boundaries);
cumulativeRegion.op(boundaries, Region.Op.UNION);
});
mManager.setTouchRegion(this, cumulativeRegion);
cumulativeRegion.recycle();
}
/**
* Removes all tracked views and updates insets accordingly.
*/
public void clear() {
mExecutor.execute(() -> {
mManager.clearRegion(this);
mTrackedViews.clear();
});
}
}
private final HashMap<TouchInsetSession, Region> mDefinedRegions = new HashMap<>();
private final Executor mExecutor;
private final View mRootView;
private final View.OnAttachStateChangeListener mAttachListener =
new View.OnAttachStateChangeListener() {
@Override
public void onViewAttachedToWindow(View v) {
updateTouchInset();
}
@Override
public void onViewDetachedFromWindow(View v) {
}
};
/**
* Default constructor.
* @param executor An {@link Executor} to marshal all operations on.
* @param rootView The root {@link View} for all views in sessions.
*/
public TouchInsetManager(Executor executor, View rootView) {
mExecutor = executor;
mRootView = rootView;
mRootView.addOnAttachStateChangeListener(mAttachListener);
}
/**
* Creates a new associated session.
*/
public TouchInsetSession createSession() {
return new TouchInsetSession(this, mExecutor);
}
/**
* Checks to see if the given point coordinates fall within an inset region.
*/
public ListenableFuture<Boolean> checkWithinTouchRegion(int x, int y) {
return CallbackToFutureAdapter.getFuture(completer -> {
mExecutor.execute(() -> completer.set(
mDefinedRegions.values().stream().anyMatch(region -> region.contains(x, y))));
return "DreamOverlayTouchMonitor::checkWithinTouchRegion";
});
}
private void updateTouchInset() {
final ViewRootImpl viewRootImpl = mRootView.getViewRootImpl();
if (viewRootImpl == null) {
return;
}
final Region aggregateRegion = Region.obtain();
for (Region region : mDefinedRegions.values()) {
aggregateRegion.op(region, Region.Op.UNION);
}
viewRootImpl.setTouchableRegion(aggregateRegion);
aggregateRegion.recycle();
}
protected void setTouchRegion(TouchInsetSession session, Region region) {
final Region introducedRegion = Region.obtain(region);
mExecutor.execute(() -> {
mDefinedRegions.put(session, introducedRegion);
updateTouchInset();
});
}
private void clearRegion(TouchInsetSession session) {
mExecutor.execute(() -> {
final Region storedRegion = mDefinedRegions.remove(session);
if (storedRegion != null) {
storedRegion.recycle();
}
updateTouchInset();
});
}
}
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