ru.annin.store.presentation.ui.behavior.FabFloat.java Source code

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Here is the source code for ru.annin.store.presentation.ui.behavior.FabFloat.java

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/*
 * Copyright 2016, Pavel Annin
 *
 * 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 ru.annin.store.presentation.ui.behavior;

import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.LinearInterpolator;

/**
 * @author Pavel Annin.
 */
public class FabFloat extends FloatingActionButton.Behavior {

    public FabFloat(Context context, AttributeSet attrs) {
        // Empty
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target,
            int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
        if (dyConsumed > 0) {
            CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
            int fabBottomMargin = layoutParams.bottomMargin;
            child.animate().translationY((float) (child.getHeight() + fabBottomMargin))
                    .setInterpolator(new LinearInterpolator()).setDuration(150);
        } else if (dyConsumed < 0) {
            child.animate().translationY(0.0f).setInterpolator(new LinearInterpolator()).setDuration(150);
        }
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child,
            View directTargetChild, View target, int nestedScrollAxes) {
        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
    }
}