Android Open Source - Android-Charts Touch Gesture Detector

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License

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Apache License??Version 2.0, January 2004??http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and condi...

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Java Source Code

/*
 * TouchGestureDetector.java/*from   w  ww  . ja  va  2 s  .c o  m*/
 * Android-Charts
 *
 * Created by limc on 2014.
 *
 * Copyright 2011 limc.cn All rights reserved.
 *
 * 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 cn.limc.androidcharts.event;
import android.graphics.PointF;
import android.view.MotionEvent;

/** 
 * <p>en</p>
 * <p>jp</p>
 * <p>cn</p>
 *
 * @author limc 
 * @version v1.0 2014/06/23 16:37:37 
 *  
 */
public class TouchGestureDetector<T extends ITouchable> implements IGestureDetector{
  
  protected PointF touchPoint;
  static final int TOUCH_MOVE_MIN_DISTANCE = 6;
  
  protected T instance;
  protected OnTouchGestureListener onTouchGestureListener;
  
  /**
   * <p>Constructor of TouchGestureDetector</p>
   * <p>TouchGestureDetector????????</p>
   * <p>TouchGestureDetector???????????</p>
   *
   */
  public TouchGestureDetector(T touchable) {
    instance = touchable;
    if (touchable != null) {
      this.onTouchGestureListener = touchable.getOnTouchGestureListener();
    }
  }

  /**
   * 
   * <p>Constructor of TouchGestureDetector</p>
   * <p>TouchGestureDetector????????</p>
   * <p>TouchGestureDetector???????????</p>
   *
   * @param touchGestureListener
   */
  public TouchGestureDetector(OnTouchGestureListener touchListener) {
    super();
    this.onTouchGestureListener = touchListener;
  }

  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN:
      if (event.getPointerCount() == 1) {
        touchPoint = new PointF(event.getX(),event.getY());
        if (onTouchGestureListener != null) {
          onTouchGestureListener.onTouchDown(instance,event);
        }
      }
      break;
    case MotionEvent.ACTION_UP:
      if (event.getPointerCount() == 1) {
        touchPoint = new PointF(event.getX(),event.getY());
        if (onTouchGestureListener != null) {
          onTouchGestureListener.onTouchUp(instance,event);
        }
      }
      break;
    case MotionEvent.ACTION_POINTER_UP:
      break;
    case MotionEvent.ACTION_POINTER_DOWN:
      break;
    case MotionEvent.ACTION_MOVE:
      // single touch point moved
      if (event.getPointerCount() == 1) {
        float moveXdistance = Math.abs(event.getX() - touchPoint.x);
        float moveYdistance = Math.abs(event.getY() - touchPoint.y);
        if (moveXdistance > TOUCH_MOVE_MIN_DISTANCE || 
            moveYdistance > TOUCH_MOVE_MIN_DISTANCE) {
          //reset touchPoint
          touchPoint = new PointF(event.getX(),event.getY());
          // call back to listener
          if (onTouchGestureListener != null) {
            onTouchGestureListener.onTouchMoved(instance,event);
          }
        }
      }
      break;
    }
    return true;
  }

  /**
   * @return the onTouchGestureListener
   */
  public OnTouchGestureListener getOnTouchGestureListener() {
    return onTouchGestureListener;
  }

  /**
   * @param onTouchGestureListener the onTouchGestureListener to set
   */
  public void setOnTouchGestureListener(
      OnTouchGestureListener onTouchGestureListener) {
    this.onTouchGestureListener = onTouchGestureListener;
  }
}

Java Source Code List