| /* |
| * Copyright (C) 2016 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.statusbar.notification; |
| |
| import android.support.v4.util.ArraySet; |
| import android.view.View; |
| |
| import com.android.systemui.statusbar.ExpandableNotificationRow; |
| import com.android.systemui.statusbar.NotificationData; |
| import com.android.systemui.statusbar.policy.OnHeadsUpChangedListener; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * A manager that ensures that notifications are visually stable. It will suppress reorderings |
| * and reorder at the right time when they are out of view. |
| */ |
| public class VisualStabilityManager implements OnHeadsUpChangedListener { |
| |
| private final ArrayList<Callback> mCallbacks = new ArrayList<>(); |
| |
| private boolean mPanelExpanded; |
| private boolean mScreenOn; |
| private boolean mReorderingAllowed; |
| private VisibilityLocationProvider mVisibilityLocationProvider; |
| private ArraySet<View> mAllowedReorderViews = new ArraySet<>(); |
| private ArraySet<View> mAddedChildren = new ArraySet<>(); |
| |
| /** |
| * Add a callback to invoke when reordering is allowed again. |
| * @param callback |
| */ |
| public void addReorderingAllowedCallback(Callback callback) { |
| if (mCallbacks.contains(callback)) { |
| return; |
| } |
| mCallbacks.add(callback); |
| } |
| |
| /** |
| * Set the panel to be expanded. |
| */ |
| public void setPanelExpanded(boolean expanded) { |
| mPanelExpanded = expanded; |
| updateReorderingAllowed(); |
| } |
| |
| /** |
| * @param screenOn whether the screen is on |
| */ |
| public void setScreenOn(boolean screenOn) { |
| mScreenOn = screenOn; |
| updateReorderingAllowed(); |
| } |
| |
| private void updateReorderingAllowed() { |
| boolean reorderingAllowed = !mScreenOn || !mPanelExpanded; |
| boolean changed = reorderingAllowed && !mReorderingAllowed; |
| mReorderingAllowed = reorderingAllowed; |
| if (changed) { |
| notifyCallbacks(); |
| } |
| } |
| |
| private void notifyCallbacks() { |
| for (int i = 0; i < mCallbacks.size(); i++) { |
| Callback callback = mCallbacks.get(i); |
| callback.onReorderingAllowed(); |
| } |
| mCallbacks.clear(); |
| } |
| |
| /** |
| * @return whether reordering is currently allowed in general. |
| */ |
| public boolean isReorderingAllowed() { |
| return mReorderingAllowed; |
| } |
| |
| /** |
| * @return whether a specific notification is allowed to reorder. Certain notifications are |
| * allowed to reorder even if {@link #isReorderingAllowed()} returns false, like newly added |
| * notifications or heads-up notifications that are out of view. |
| */ |
| public boolean canReorderNotification(ExpandableNotificationRow row) { |
| if (mReorderingAllowed) { |
| return true; |
| } |
| if (mAddedChildren.contains(row)) { |
| return true; |
| } |
| if (mAllowedReorderViews.contains(row) |
| && !mVisibilityLocationProvider.isInVisibleLocation(row)) { |
| return true; |
| } |
| return false; |
| } |
| |
| public void setVisibilityLocationProvider( |
| VisibilityLocationProvider visibilityLocationProvider) { |
| mVisibilityLocationProvider = visibilityLocationProvider; |
| } |
| |
| public void onReorderingFinished() { |
| mAllowedReorderViews.clear(); |
| mAddedChildren.clear(); |
| } |
| |
| @Override |
| public void onHeadsUpStateChanged(NotificationData.Entry entry, boolean isHeadsUp) { |
| if (isHeadsUp) { |
| // Heads up notifications should in general be allowed to reorder if they are out of |
| // view and stay at the current location if they aren't. |
| mAllowedReorderViews.add(entry.row); |
| } |
| } |
| |
| /** |
| * Notify the visual stability manager that a new view was added and should be allowed to |
| * reorder next time. |
| */ |
| public void notifyViewAddition(View view) { |
| mAddedChildren.add(view); |
| } |
| |
| public interface Callback { |
| /** |
| * Called when reordering is allowed again. |
| */ |
| void onReorderingAllowed(); |
| } |
| |
| } |