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/*
* 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.setupwizardlib.util;
import android.view.View;
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 abstract class AbstractRequireScrollHelper implements View.OnClickListener {
private final NavigationBar mNavigationBar;
private boolean mScrollNeeded;
// Whether the user have seen the more button yet.
private boolean mScrollNotified = false;
protected AbstractRequireScrollHelper(NavigationBar navigationBar) {
mNavigationBar = navigationBar;
}
protected void requireScroll() {
mNavigationBar.getMoreButton().setOnClickListener(this);
}
protected void notifyScrolledToBottom() {
if (mScrollNeeded) {
mNavigationBar.post(new Runnable() {
@Override
public void run() {
mNavigationBar.getNextButton().setVisibility(View.VISIBLE);
mNavigationBar.getMoreButton().setVisibility(View.GONE);
}
});
mScrollNeeded = false;
mScrollNotified = true;
}
}
protected void notifyRequiresScroll() {
if (!mScrollNeeded && !mScrollNotified) {
mNavigationBar.post(new Runnable() {
@Override
public void run() {
mNavigationBar.getNextButton().setVisibility(View.GONE);
mNavigationBar.getMoreButton().setVisibility(View.VISIBLE);
}
});
mScrollNeeded = true;
}
}
@Override
public void onClick(View view) {
pageScrollDown();
}
protected abstract void pageScrollDown();
}
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