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/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget.fab;
import android.support.v7.widget.RecyclerView;
public class FloatingActionsMenuRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
private static final float SCALE_FACTOR = 1.5f;
private final FloatingActionsMenu menu;
public FloatingActionsMenuRecyclerViewScrollListener(final FloatingActionsMenu menu) {
this.menu = menu;
}
private static float bound(final float min, final float proposal, final float max) {
return Math.min(max, Math.max(min, proposal));
}
@Override
public void onScrolled(final RecyclerView recyclerView, final int dx, final int dy) {
super.onScrolled(recyclerView, dx, dy);
menu.setScrollYTranslation(bound(0, menu.getScrollYTranslation() + dy * SCALE_FACTOR, menu.getMeasuredHeight() - menu.getTranslationY()));
}
}
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