/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.systemui.statusbar.notification;
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import android.view.View;
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import android.view.ViewGroup;
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import com.android.internal.annotations.VisibleForTesting;
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import com.android.systemui.statusbar.notification.row.ExpandableNotificationRow;
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/**
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* An observer that listens to the above shelf state and can notify listeners
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*/
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public class AboveShelfObserver implements AboveShelfChangedListener {
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private final ViewGroup mHostLayout;
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private boolean mHasViewsAboveShelf = false;
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private HasViewAboveShelfChangedListener mListener;
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public AboveShelfObserver(ViewGroup hostLayout) {
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mHostLayout = hostLayout;
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}
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public void setListener(HasViewAboveShelfChangedListener listener) {
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mListener = listener;
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}
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@Override
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public void onAboveShelfStateChanged(boolean aboveShelf) {
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boolean hasViewsAboveShelf = aboveShelf;
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if (!hasViewsAboveShelf && mHostLayout != null) {
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int n = mHostLayout.getChildCount();
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for (int i = 0; i < n; i++) {
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View child = mHostLayout.getChildAt(i);
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if (child instanceof ExpandableNotificationRow) {
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if (((ExpandableNotificationRow) child).isAboveShelf()) {
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hasViewsAboveShelf = true;
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break;
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}
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}
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}
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}
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if (mHasViewsAboveShelf != hasViewsAboveShelf) {
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mHasViewsAboveShelf = hasViewsAboveShelf;
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if (mListener != null) {
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mListener.onHasViewsAboveShelfChanged(hasViewsAboveShelf);
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}
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}
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}
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@VisibleForTesting
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boolean hasViewsAboveShelf() {
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return mHasViewsAboveShelf;
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}
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public interface HasViewAboveShelfChangedListener {
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void onHasViewsAboveShelfChanged(boolean hasViewsAboveShelf);
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}
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}
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