transdroid/app/src/main/java/org/transdroid/core/gui/lists/TorrentProgressBar.java

/* 
 * Copyright 2010-2013 Eric Kok et al.
 * 
 * Transdroid 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.
 * 
 * Transdroid 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 Transdroid.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.transdroid.core.gui.lists;

import org.transdroid.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * Draws a progress bar indicating the download progress as well as the torrent status.
 * 
 * @author Eric Kok
 */
public class TorrentProgressBar extends View {

	private final float scale = getContext().getResources().getDisplayMetrics().density;
	private final int MINIMUM_HEIGHT = (int) (3 * scale + 0.5f);

	private int progress;
	private boolean isActive;
	private boolean isError;
	private final Paint notdonePaint = new Paint();
	private final Paint inactiveDonePaint = new Paint();
	private final Paint inactivePaint = new Paint();
	private final Paint progressPaint = new Paint();
	private final Paint donePaint = new Paint();
	private final Paint errorPaint = new Paint();
	private final RectF fullRect = new RectF();
	private final RectF progressRect = new RectF();

	public void setProgress(int progress) {
		this.progress = progress;
		this.invalidate();
	}

	public void setActive(boolean isActive) {
		this.isActive = isActive;
		this.invalidate();
	}

	public void setError(boolean isError) {
		this.isError = isError;
		this.invalidate();
	}

	public TorrentProgressBar(Context context) {
		super(context);
		initPaints();
	}

	public TorrentProgressBar(Context context, AttributeSet attrs) {
		super(context, attrs);
		initPaints();

		// Parse any set attributes from XML
		TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TorrentProgressBar);
		if (a.hasValue(R.styleable.TorrentProgressBar_progress)) {
			this.progress = a.getIndex(R.styleable.TorrentProgressBar_progress);
			this.isActive = a.getBoolean(R.styleable.TorrentProgressBar_isActive, false);
		}
		a.recycle();
	}

	private void initPaints() {
		notdonePaint.setColor(0xFFEEEEEE);		// Light grey
		inactiveDonePaint.setColor(0xFFA759D4);	// Purple
		inactivePaint.setColor(0xFF9E9E9E);		// Grey
		progressPaint.setColor(0xFF42A8FA);		// Blue
		donePaint.setColor(0xFF8ACC12);			// Green
		errorPaint.setColor(0xFFDE3939);		// Red
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		int ws = MeasureSpec.getSize(widthMeasureSpec);
		int hs = Math.max(getHeight(), MINIMUM_HEIGHT);
		setMeasuredDimension(ws, hs);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);

		int height = getHeight();
		int width = getWidth();
		fullRect.set(0, 0, width, height);

		// Error?
		if (isError) {
			canvas.drawRect(fullRect, errorPaint);
		} else {
			// Background rounded rectangle
			canvas.drawRect(fullRect, notdonePaint);

			// Foreground progress indicator
			if (progress > 0) {
				progressRect.set(0, 0, width * ((float) progress / 100), height);
				canvas.drawRect(progressRect, (isActive ? (progress == 100 ? donePaint : progressPaint)
						: (progress == 100 ? inactiveDonePaint : inactivePaint)));
			}
		}

	}

}