content: /*
   * Copyright (c) 2020. André Mion
   *
   * 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.andremion.louvre.util;
  
  import android.content.Context;
  import android.util.AttributeSet;
  import android.view.View;
  
  import androidx.annotation.NonNull;
  import androidx.coordinatorlayout.widget.CoordinatorLayout;
  import androidx.core.view.ViewCompat;
  import androidx.recyclerview.widget.RecyclerView;
  
  import com.google.android.material.floatingactionbutton.FloatingActionButton;
  
  /**
   * Custom {@link FloatingActionButton.Behavior} to hide {@link FloatingActionButton} when user is scrolling
   */
  public class FabBehavior extends FloatingActionButton.Behavior {
  
      public FabBehavior() {
      }
  
      public FabBehavior(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      @Override
      public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull FloatingActionButton child,
                                         @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
          return super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, axes, type)
                  || (type == ViewCompat.TYPE_TOUCH && (axes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0
                  && target instanceof RecyclerView);
      }
  
      @Override
      public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull FloatingActionButton child,
                                 @NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed,
                                 int type, @NonNull int[] consumed) {
          super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type, consumed);
          if (type == ViewCompat.TYPE_TOUCH && Math.abs(dyConsumed) > 0 && child.getVisibility() == View.VISIBLE) {
              child.hide();
          }
      }
  
      @Override
      public void onStopNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull FloatingActionButton child,
                                     @NonNull View target, int type) {
          super.onStopNestedScroll(coordinatorLayout, child, target, type);
          if (type == ViewCompat.TYPE_TOUCH) child.show();
      }
  }
  