TouchAreaView.java

/*
 * Protocoder 
 * A prototyping platform for Android devices 
 * 
 * Victor Diaz Barrales victormdb@gmail.com
 *
 * Copyright (C) 2014 Victor Diaz
 * Copyright (C) 2013 Motorola Mobility LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software
 * is furnished to do so, subject to the following conditions: 
 * 
 * The above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 * THE SOFTWARE.
 * 
 */

package org.protocoderrunner.views;

/*
 * use vectors 
 * add values to it 
 * 
 */

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PorterDuff.Mode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.MotionEvent;
import android.view.View;

public class TouchAreaView extends View {
	private static final String TAG = "TouchAreaView";
	// paint
	private Paint mPaint = new Paint();
	private Canvas mCanvas = new Canvas();
	private Bitmap bitmap; // Cache

	// widget size
	private float mWidth;
	private float mHeight;
	private float xPointer;
	private float yPointer;
	private boolean touching = false;
	private OnTouchAreaListener mOnTouchAreaListener;
	private boolean showArea;

	public TouchAreaView(Context context, boolean showArea) {
		super(context);

		this.showArea = showArea;
		init();
	}

	public TouchAreaView(Context context) {
		super(context);
		init();
	}

	public void init() {
		mPaint.setStrokeWidth(1.0f);
		// mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);

		if (isInEditMode()) {
			loadDemoValues();
		}
	}

	public void loadDemoValues() {

	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		mWidth = w - 1;
		mHeight = h - 1;

		// create a bitmap for caching what was drawn
		if (bitmap != null) {
			bitmap.recycle();
		}

		mCanvas = new Canvas();
		bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
		mCanvas.setBitmap(bitmap);

		super.onSizeChanged(w, h, oldw, oldh);
	}

	@Override
	protected void onDraw(Canvas canvas) {

		synchronized (this) {

			// saved
			canvas.drawBitmap(bitmap, new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()),
					new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()), null);

			// paint
			// mPaint.setStyle(Style.STROKE);

			if (showArea) {
				mPaint.setColor(0x88FFFFFF);
				mPaint.setStyle(Style.STROKE);

				mCanvas.drawRect(new RectF(0, 0, mWidth, mHeight), mPaint);

				if (touching) {
					mPaint.setStyle(Paint.Style.FILL);
					mPaint.setColor(0x880000FF);
					mCanvas.drawRect(new RectF(0, 0, mWidth, mHeight), mPaint);
				} else {
					mPaint.setStyle(Paint.Style.STROKE);
					mCanvas.drawColor(0, Mode.CLEAR);
					mPaint.setColor(0x88000000);
					mCanvas.drawRect(new RectF(0, 0, mWidth, mHeight), mPaint);
				}
			}
		}
	}

	public class TouchEvent {
		String type;
		int num;
		int action;
		int x;
		int y;

		public TouchEvent(String type, int pointerId, int action2, int x, int y) {
			this.type = type;
			this.num = pointerId;
			this.action = action2;
			this.x = x;
			this.y = y;
		}

	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// Convert coordinates to our internal coordinate system
		xPointer = event.getX();
		yPointer = event.getY();
		// MLog.d(TAG, xPointer + " " + yPointer);

		switch (event.getActionMasked()) {
		case MotionEvent.ACTION_CANCEL:
			touching = false;
			break;

		case MotionEvent.ACTION_DOWN:
			touching = true;
			break;

		case MotionEvent.ACTION_UP:
			touching = false;
			break;

		case MotionEvent.ACTION_MOVE:
			if (xPointer > 0 && xPointer < mWidth && yPointer > 0 && yPointer < mHeight) {
				touching = true;
			} else {
				touching = false;
			}
			break;

		}

		mOnTouchAreaListener.onTouch(this, touching, xPointer, yPointer);

		invalidate();
		// return touching;
		return super.onTouchEvent(event);
	}

	public void destroy() {
		if (bitmap != null) {
			bitmap.recycle();
		}
	}

	public void setTouchAreaListener(OnTouchAreaListener l) {
		mOnTouchAreaListener = l;
	}

	public interface OnTouchAreaListener {
		public abstract void onTouch(TouchAreaView touchAreaView, boolean touching, float xPointer, float yPointer);
	}

	void printSamples(MotionEvent ev) {
		final int historySize = ev.getHistorySize();
		final int pointerCount = ev.getPointerCount();
		for (int h = 0; h < historySize; h++) {
			System.out.printf("At time %d:", ev.getHistoricalEventTime(h));
			for (int p = 0; p < pointerCount; p++) {
				System.out.printf("  pointer %d: (%f,%f)", ev.getPointerId(p), ev.getHistoricalX(p, h),
						ev.getHistoricalY(p, h));
			}
		}
		System.out.printf("At time %d:", ev.getEventTime());
		for (int p = 0; p < pointerCount; p++) {
			System.out.printf("  pointer %d: (%f,%f)", ev.getPointerId(p), ev.getX(p), ev.getY(p));
		}
	}

}