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/*
* Copyright (C) 2015 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.setupwizardlib.util;
import android.view.View;
import android.widget.ScrollView;
import com.android.setupwizardlib.view.BottomScrollView;
import com.android.setupwizardlib.view.NavigationBar;
/**
* Add this helper to require the scroll view to be scrolled to the bottom, making sure that the
* user sees all content on the screen. This will change the navigation bar to show the more button
* instead of the next button when there is more content to be seen. When the more button is
* clicked, the scroll view will be scrolled one page down.
*/
public class RequireScrollHelper implements BottomScrollView.BottomScrollListener,
View.OnClickListener {
/**
* Require scrolling on the scrollView, so that if the scrollView has content hidden beneath the
* fold, the next button will be hidden and the more button will be shown instead. The more
* button will scroll the scrollView downwards when clicked until the bottom is reached.
*
* @param navigationBar The navigation bar in which the next button's label will be changed.
* @param scrollView The {@link BottomScrollView} to be scrolled.
*/
public static RequireScrollHelper requireScroll(NavigationBar navigationBar,
BottomScrollView scrollView) {
final RequireScrollHelper helper = new RequireScrollHelper(navigationBar, scrollView);
helper.requireScroll();
return helper;
}
private final BottomScrollView mScrollView;
private final NavigationBar mNavigationBar;
private boolean mScrollNeeded;
private RequireScrollHelper(NavigationBar navigationBar, BottomScrollView scrollView) {
mNavigationBar = navigationBar;
mScrollView = scrollView;
}
private void requireScroll() {
mNavigationBar.getMoreButton().setOnClickListener(this);
mScrollView.setBottomScrollListener(this);
}
@Override
public void onScrolledToBottom() {
if (mScrollNeeded) {
mNavigationBar.getNextButton().setVisibility(View.VISIBLE);
mNavigationBar.getMoreButton().setVisibility(View.GONE);
mScrollNeeded = false;
}
}
@Override
public void onRequiresScroll() {
if (!mScrollNeeded) {
mNavigationBar.getNextButton().setVisibility(View.GONE);
mNavigationBar.getMoreButton().setVisibility(View.VISIBLE);
mScrollNeeded = true;
}
}
@Override
public void onClick(View view) {
mScrollView.pageScroll(ScrollView.FOCUS_DOWN);
}
}
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