/**
 * Copyright (C) 2009 Michael A. MacDonald
 */
package android.androidVNC;

import android.view.GestureDetector;
import android.view.MotionEvent;

/**
 * An AbstractInputHandler that uses GestureDetector to detect standard gestures in touch events
 * 
 * @author Michael A. MacDonald
 */
abstract class AbstractGestureInputHandler extends GestureDetector.SimpleOnGestureListener implements AbstractInputHandler {
	protected GestureDetector gestures = new GestureDetector(this);
	private VncCanvasActivity activity;
	
	float xInitialFocus;
	float yInitialFocus;
	boolean inScaling;
	
	private static final String TAG = "AbstractGestureInputHandler";
	
	AbstractGestureInputHandler(VncCanvasActivity c)
	{
		activity = c;
		gestures.setOnDoubleTapListener(this);
	}

	@Override
	public boolean onTouchEvent(MotionEvent evt) {
		//MK
		if(evt.getAction()==MotionEvent.ACTION_CANCEL)
			return true;
		
		return gestures.onTouchEvent(evt);
	}

	/* (non-Javadoc)
	 * @see com.antlersoft.android.bc.OnScaleGestureListener#onScale(com.antlersoft.android.bc.IBCScaleGestureDetector)
	 */
//	@Override
//	public boolean onScale(IBCScaleGestureDetector detector) {
//		boolean consumed = true;
//		//if (detector.)
//		//Log.i(TAG,"Focus("+detector.getFocusX()+","+detector.getFocusY()+") scaleFactor = "+detector.getScaleFactor());
//		// Calculate focus shift
//		float fx = detector.getFocusX();
//		float fy = detector.getFocusY(); 
//		double xfs = fx - xInitialFocus;
//		double yfs = fy - yInitialFocus;
//		double fs = Math.sqrt(xfs * xfs + yfs * yfs);
//		if (Math.abs(1.0 - detector.getScaleFactor())<0.02)
//			consumed = false;
//		if (fs * 2< Math.abs(detector.getCurrentSpan() - detector.getPreviousSpan()))
//		{
//			inScaling = true;
//			if (consumed)
//			{
//				//Log.i(TAG,"Adjust scaling "+detector.getScaleFactor());
//				if (activity.vncCanvas != null && activity.vncCanvas.scaling != null)
//					activity.vncCanvas.scaling.adjust(activity, detector.getScaleFactor(), fx, fy);
//			}
//		}
//		return consumed;
//	}
//
//	/* (non-Javadoc)
//	 * @see com.antlersoft.android.bc.OnScaleGestureListener#onScaleBegin(com.antlersoft.android.bc.IBCScaleGestureDetector)
//	 */
//	@Override
//	public boolean onScaleBegin(IBCScaleGestureDetector detector) {
//		xInitialFocus = detector.getFocusX();
//		yInitialFocus = detector.getFocusY();
//		inScaling = false;
//		//Log.i(TAG,"scale begin ("+xInitialFocus+","+yInitialFocus+")");
//		return true;
//	}
//
//	/* (non-Javadoc)
//	 * @see com.antlersoft.android.bc.OnScaleGestureListener#onScaleEnd(com.antlersoft.android.bc.IBCScaleGestureDetector)
//	 */
//	@Override
//	public void onScaleEnd(IBCScaleGestureDetector detector) {
//		//Log.i(TAG,"scale end");
//		inScaling = false;
//	}
}
