content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.weex.ui.view.gesture;
  
  import android.support.annotation.Nullable;
  import android.view.MotionEvent;
  import android.view.View;
  
  import org.apache.weex.ui.view.WXFrameLayout;
  
  /**
   * Views that want to receive Gesture Event must implement this interface. Besides,
   * those view must override their {@link android.view.View#onTouchEvent(MotionEvent)}
   * and add method invocation to {@link WXGesture#onTouch(View, MotionEvent)}.
   * Refer to {@link WXFrameLayout#onTouchEvent(MotionEvent)} for more info.
   *
   */
  public interface WXGestureObservable {
  
    /**
     * Register a {@link WXGesture} for corresponding view.
     * @param wxGesture The Gesture to register, null for unregister.
     */
    void registerGestureListener(@Nullable WXGesture wxGesture);
  
    /**
     * Get gesture listener for corresponding view.
     *
     * @return the gesture listener has register before
     *
     * */
    WXGesture getGestureListener();
  }
  