/**
 * Copyright (C) 2013- Iordan Iordanov
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */


package com.undatech.opaque.input;

import android.view.MotionEvent;
import android.os.Vibrator;

import com.undatech.opaque.R;
import com.undatech.opaque.Constants;
import com.undatech.opaque.RemoteCanvas;
import com.undatech.opaque.RemoteCanvasActivity;
import com.undatech.opaque.input.RemotePointer;

public class InputHandlerDirectDragPan extends InputHandlerGeneric {
	static final String TAG = "InputHandlerDirectDragPan";
	public static final String ID = "DirectDragPan";
	
	/**
	 * @param c
	 */
	public InputHandlerDirectDragPan(RemoteCanvasActivity activity, RemoteCanvas canvas, Vibrator myVibrator) {
		super(activity, canvas, myVibrator);
	}

	/*
	 * (non-Javadoc)
	 * @see com.undatech.opaque.input.InputHandler#getDescription()
	 */
	@Override
	public String getDescription() {
		return canvas.getResources().getString(R.string.input_method_direct_drag_pan_description);
	}

	/*
	 * (non-Javadoc)
	 * @see com.undatech.opaque.input.InputHandler#getId()
	 */
	@Override
	public String getId() {
		return ID;
	}
	
	/*
	 * (non-Javadoc)
	 * @see com.undatech.opaque.input.InputHandlerGeneric#onLongPress(android.view.MotionEvent)
	 */
	@Override
	public void onLongPress(MotionEvent e) {

		// If we've performed a right/middle-click and the gesture is not over yet, do not start drag mode.
		if (secondPointerWasDown || thirdPointerWasDown)
			return;
		
		myVibrator.vibrate(Constants.SHORT_VIBRATION);

		canvas.displayShortToastMessage("Panning");
		endDragModesAndScrolling();
		panMode = true;
	}
	

	/*
	 * (non-Javadoc)
	 * @see android.view.GestureDetector.SimpleOnGestureListener#onScroll(android.view.MotionEvent, android.view.MotionEvent, float, float)
	 */
	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        RemotePointer p = canvas.getPointer();

        // If we are scaling, allow panning around by moving two fingers around the screen
        if (inScaling) {
    		float scale = canvas.getZoomFactor();
    		activity.showKbdIcon();
    		canvas.relativePan((int)(distanceX*scale), (int)(distanceY*scale));
        } else {        
			// onScroll called while scaling/swiping gesture is in effect. We ignore the event and pretend it was
			// consumed. This prevents the mouse pointer from flailing around while we are scaling.
			// Also, if one releases one finger slightly earlier than the other when scaling, it causes Android 
			// to stick a spiteful onScroll with a MASSIVE delta here. 
			// This would cause the mouse pointer to jump to another place suddenly.
			// Hence, we ignore onScroll after scaling until we lift all pointers up.
			boolean twoFingers = false;
			if (e1 != null)
				twoFingers = (e1.getPointerCount() > 1);
			if (e2 != null)
				twoFingers = twoFingers || (e2.getPointerCount() > 1);
	
			if (twoFingers||inSwiping||scalingJustFinished)
				return true;
	
			activity.showKbdIcon();
			
			if (!dragMode) {
				dragMode = true;
				p.leftButtonDown(getX(e1), getY(e1), e1.getMetaState());
			} else {
				p.moveMouseButtonDown(getX(e2), getY(e2), e2.getMetaState());
			}
        }
    	canvas.movePanToMakePointerVisible();
		return true;
	}
}