| /* |
| * 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 android.view; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.graphics.Rect; |
| |
| import com.android.internal.util.Preconditions; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * Used by {@link ViewRootImpl} to track system gesture exclusion rects reported by views. |
| */ |
| class GestureExclusionTracker { |
| private boolean mGestureExclusionViewsChanged = false; |
| private boolean mRootGestureExclusionRectsChanged = false; |
| private List<Rect> mRootGestureExclusionRects = Collections.emptyList(); |
| private List<GestureExclusionViewInfo> mGestureExclusionViewInfos = new ArrayList<>(); |
| private List<Rect> mGestureExclusionRects = Collections.emptyList(); |
| |
| public void updateRectsForView(@NonNull View view) { |
| boolean found = false; |
| final Iterator<GestureExclusionViewInfo> i = mGestureExclusionViewInfos.iterator(); |
| while (i.hasNext()) { |
| final GestureExclusionViewInfo info = i.next(); |
| final View v = info.getView(); |
| if (v == null || !v.isAttachedToWindow() || !v.isAggregatedVisible()) { |
| mGestureExclusionViewsChanged = true; |
| i.remove(); |
| continue; |
| } |
| if (v == view) { |
| found = true; |
| info.mDirty = true; |
| break; |
| } |
| } |
| if (!found && view.isAttachedToWindow()) { |
| mGestureExclusionViewInfos.add(new GestureExclusionViewInfo(view)); |
| mGestureExclusionViewsChanged = true; |
| } |
| } |
| |
| @Nullable |
| public List<Rect> computeChangedRects() { |
| boolean changed = mRootGestureExclusionRectsChanged; |
| final Iterator<GestureExclusionViewInfo> i = mGestureExclusionViewInfos.iterator(); |
| final List<Rect> rects = new ArrayList<>(mRootGestureExclusionRects); |
| while (i.hasNext()) { |
| final GestureExclusionViewInfo info = i.next(); |
| switch (info.update()) { |
| case GestureExclusionViewInfo.CHANGED: |
| changed = true; |
| // Deliberate fall-through |
| case GestureExclusionViewInfo.UNCHANGED: |
| rects.addAll(info.mExclusionRects); |
| break; |
| case GestureExclusionViewInfo.GONE: |
| mGestureExclusionViewsChanged = true; |
| i.remove(); |
| break; |
| } |
| } |
| if (changed || mGestureExclusionViewsChanged) { |
| mGestureExclusionViewsChanged = false; |
| mRootGestureExclusionRectsChanged = false; |
| if (!mGestureExclusionRects.equals(rects)) { |
| mGestureExclusionRects = rects; |
| return rects; |
| } |
| } |
| return null; |
| } |
| |
| public void setRootSystemGestureExclusionRects(@NonNull List<Rect> rects) { |
| Preconditions.checkNotNull(rects, "rects must not be null"); |
| mRootGestureExclusionRects = rects; |
| mRootGestureExclusionRectsChanged = true; |
| } |
| |
| @NonNull |
| public List<Rect> getRootSystemGestureExclusionRects() { |
| return mRootGestureExclusionRects; |
| } |
| |
| private static class GestureExclusionViewInfo { |
| public static final int CHANGED = 0; |
| public static final int UNCHANGED = 1; |
| public static final int GONE = 2; |
| |
| private final WeakReference<View> mView; |
| boolean mDirty = true; |
| List<Rect> mExclusionRects = Collections.emptyList(); |
| |
| GestureExclusionViewInfo(View view) { |
| mView = new WeakReference<>(view); |
| } |
| |
| public View getView() { |
| return mView.get(); |
| } |
| |
| public int update() { |
| final View excludedView = getView(); |
| if (excludedView == null || !excludedView.isAttachedToWindow() |
| || !excludedView.isAggregatedVisible()) return GONE; |
| final List<Rect> localRects = excludedView.getSystemGestureExclusionRects(); |
| final List<Rect> newRects = new ArrayList<>(localRects.size()); |
| for (Rect src : localRects) { |
| Rect mappedRect = new Rect(src); |
| ViewParent p = excludedView.getParent(); |
| if (p != null && p.getChildVisibleRect(excludedView, mappedRect, null)) { |
| newRects.add(mappedRect); |
| } |
| } |
| |
| if (mExclusionRects.equals(localRects)) return UNCHANGED; |
| mExclusionRects = newRects; |
| return CHANGED; |
| } |
| } |
| } |