FloatingActionButtonBehaviour.java

/*
 * VoIP.ms SMS
 * Copyright (C) 2016 Michael Kourlas and other contributors
 *
 * 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 net.kourlas.voipms_sms.ui;

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

@SuppressWarnings("unused")
public class FloatingActionButtonBehaviour
    extends CoordinatorLayout.Behavior<FloatingActionButton>
{
    public FloatingActionButtonBehaviour(Context context, AttributeSet attrs) {
        super();
    }

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

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

    @Override
    public void onDependentViewRemoved(CoordinatorLayout parent,
                                       FloatingActionButton child,
                                       View dependency)
    {
        child.setTranslationY(0);
    }
}