4860e4ee48
Test: make setup-wizard-lib Bug: 76692459 Change-Id: I40171e973d442b1a1815e9e7d7c2cc984cb38bac
89 lines
2.8 KiB
Java
89 lines
2.8 KiB
Java
/*
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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.setupwizardlib.template;
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import android.util.Log;
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import android.widget.AbsListView;
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import android.widget.ListAdapter;
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import android.widget.ListView;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import com.android.setupwizardlib.template.RequireScrollMixin.ScrollHandlingDelegate;
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/**
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* {@link ScrollHandlingDelegate} which analyzes scroll events from {@link ListView} and
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* notifies {@link RequireScrollMixin} about scrollability changes.
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*/
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public class ListViewScrollHandlingDelegate implements ScrollHandlingDelegate,
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AbsListView.OnScrollListener {
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private static final String TAG = "ListViewDelegate";
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private static final int SCROLL_DURATION = 500;
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@NonNull
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private final RequireScrollMixin mRequireScrollMixin;
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@Nullable
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private final ListView mListView;
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public ListViewScrollHandlingDelegate(
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@NonNull RequireScrollMixin requireScrollMixin,
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@Nullable ListView listView) {
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mRequireScrollMixin = requireScrollMixin;
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mListView = listView;
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}
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@Override
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public void startListening() {
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if (mListView != null) {
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mListView.setOnScrollListener(this);
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final ListAdapter adapter = mListView.getAdapter();
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if (mListView.getLastVisiblePosition() < adapter.getCount()) {
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mRequireScrollMixin.notifyScrollabilityChange(true);
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}
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} else {
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Log.w(TAG, "Cannot require scroll. List view is null");
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}
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}
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@Override
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public void pageScrollDown() {
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if (mListView != null) {
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final int height = mListView.getHeight();
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mListView.smoothScrollBy(height, SCROLL_DURATION);
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}
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}
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@Override
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public void onScrollStateChanged(AbsListView view, int scrollState) {
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}
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@Override
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public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
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int totalItemCount) {
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if (firstVisibleItem + visibleItemCount >= totalItemCount) {
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mRequireScrollMixin.notifyScrollabilityChange(false);
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} else {
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mRequireScrollMixin.notifyScrollabilityChange(true);
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}
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}
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}
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