app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java


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/*
 * Copyright © 2018 Harsh Shandilya <msfjarvis@gmail.com>
 * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

package com.wireguard.android.widget.fab;

import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.util.AttributeSet;
import android.view.View;

public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionsMenu> {

    public FloatingActionButtonBehavior(final Context context, final AttributeSet attrs) { }

    @Override
    public boolean layoutDependsOn(final CoordinatorLayout parent, final FloatingActionsMenu child,
                                   final View dependency) {
        return dependency instanceof Snackbar.SnackbarLayout;
    }

    @Override
    public boolean onDependentViewChanged(final CoordinatorLayout parent, final FloatingActionsMenu child,
                                          final View dependency) {
        final float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
        child.setTranslationY(translationY);
        return true;
    }
}