ScrollAwareFABBehavior.java

/*
 * Copyright (c) 2016 咖枯 <kaku201313@163.com>
 *
 * 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.jaydenxiao.androidfire.widget;

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 com.jaydenxiao.androidfire.app.AppConstant;
import com.jaydenxiao.common.baserx.RxBus;
import com.jaydenxiao.common.baserx.RxManager;

public class ScrollAwareFABBehavior extends FloatingActionButton.Behavior {
    RxManager rxManager;
    public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
        super();
        if (rxManager==null){
            rxManager=new RxManager();
        }
    }

    @Override
    public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
                                       final View directTargetChild, final View target, final int nestedScrollAxes) {
        // Ensure we react to vertical scrolling
        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
                || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
    }


    @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 && child.getVisibility() == View.VISIBLE) {
            child.hide();
            RxBus.getInstance().post(AppConstant.MENU_SHOW_HIDE,false);
        } else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
            RxBus.getInstance().post(AppConstant.MENU_SHOW_HIDE,true);
            child.show();
        }
    }
}