DPadMouseKeyHandler.java

/**
 * Copyright (c) 2010 Michael A. MacDonald
 */
package android.androidVNC;

import android.graphics.PointF;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.MotionEvent;

/**
 * Input handlers delegate to this class to handle keystrokes; this detects keystrokes
 * from the DPad and uses them to perform mouse actions; other keystrokes are passed to
 * VncCanvasActivity.defaultKeyXXXHandler
 * 
 * @author Michael A. MacDonald
 *
 */
class DPadMouseKeyHandler {
	private MouseMover mouseMover;
	private boolean mouseDown;
	private VncCanvasActivity activity;
	private VncCanvas canvas;
	private boolean isMoving;
	
	DPadMouseKeyHandler(VncCanvasActivity activity, Handler handler)
	{
		this.activity = activity;
		canvas = activity.vncCanvas;
		mouseMover = new MouseMover(activity, handler);
	}

	public boolean onKeyDown(int keyCode, KeyEvent evt) {
		int xv = 0;
		int yv = 0;
		boolean result = true;
		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_LEFT:
			xv = -1;
			break;
		case KeyEvent.KEYCODE_DPAD_RIGHT:
			xv = 1;
			break;
		case KeyEvent.KEYCODE_DPAD_UP:
			yv = -1;
			break;
		case KeyEvent.KEYCODE_DPAD_DOWN:
			yv = 1;
			break;
		case KeyEvent.KEYCODE_DPAD_CENTER:
			if (!mouseDown) {
				mouseDown = true;
				result = canvas.processPointerEvent(canvas.mouseX, canvas.mouseY, MotionEvent.ACTION_DOWN, evt.getMetaState(), mouseDown, canvas.cameraButtonDown);
			}
			break;
		default:
			result = activity.defaultKeyDownHandler(keyCode, evt);
			break;
		}
		if ((xv != 0 || yv != 0) && !isMoving) {
			final int x = xv;
			final int y = yv;
			isMoving = true;
			mouseMover.start(x, y, new Panner.VelocityUpdater() {

				/*
				 * (non-Javadoc)
				 * 
				 * @see android.androidVNC.Panner.VelocityUpdater#updateVelocity(android.graphics.Point,
				 *      long)
				 */
				@Override
				public boolean updateVelocity(PointF p, long interval) {
					double scale = (1.2 * (double) interval / 50.0);
					if (Math.abs(p.x) < 500)
						p.x += (int) (scale * x);
					if (Math.abs(p.y) < 500)
						p.y += (int) (scale * y);
					return true;
				}

			});
			canvas.processPointerEvent(canvas.mouseX + x, canvas.mouseY + y, MotionEvent.ACTION_MOVE, evt.getMetaState(), mouseDown, canvas.cameraButtonDown);
			
		}
		return result;
	}

	public boolean onKeyUp(int keyCode, KeyEvent evt) {
		boolean result = false;

		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_LEFT:
		case KeyEvent.KEYCODE_DPAD_RIGHT:
		case KeyEvent.KEYCODE_DPAD_UP:
		case KeyEvent.KEYCODE_DPAD_DOWN:
			mouseMover.stop();
			isMoving = false;
			result = true;
			break;
		case KeyEvent.KEYCODE_DPAD_CENTER:
			if (mouseDown) {
				mouseDown = false;
				result = canvas.processPointerEvent(canvas.mouseX, canvas.mouseY, MotionEvent.ACTION_UP, evt.getMetaState(), mouseDown, canvas.cameraButtonDown);
			} else {
				result = true;
			}
			break;
		default:
			result = activity.defaultKeyUpHandler(keyCode, evt);
			break;
		}
		return result;
	}
}