ProgressIndication.java

package trident.swing;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.RoundRectangle2D;

import javax.swing.*;

import org.pushingpixels.trident.Timeline;
import org.pushingpixels.trident.Timeline.RepeatBehavior;
import org.pushingpixels.trident.interpolator.*;
import org.pushingpixels.trident.swing.SwingRepaintTimeline;

public class ProgressIndication extends JFrame {
	public static class ProgressPanel extends JPanel {
		private static final int INNER_HEIGHT = 60;

		private static final int INNER_WIDTH = 300;

		private static final int HIGHLIGHTER_HEIGHT = 2;

		private static final int HIGHLIGHTER_WIDTH = 58;

		private int xPosition;

		private float alpha;

		private boolean started;

		private Timeline progressTimeline;

		public ProgressPanel() {
			this.xPosition = 0;
			this.alpha = 0;

			this.addMouseListener(new MouseAdapter() {
				@Override
				public void mouseClicked(MouseEvent e) {
					if (started)
						return;

					start();
					started = true;
				}
			});

			this.addComponentListener(new ComponentAdapter() {
				@Override
				public void componentResized(ComponentEvent e) {
					if (started) {
						progressTimeline.cancel();
						start();
					}
				}
			});

			new SwingRepaintTimeline(this).playLoop(RepeatBehavior.LOOP);
		}

		public void start() {
			progressTimeline = new Timeline(this);

			int startX = (getWidth() - INNER_WIDTH) / 2 + 18
					+ HIGHLIGHTER_WIDTH / 2;
			int endX = (getWidth() + INNER_WIDTH) / 2 - 18 - HIGHLIGHTER_WIDTH
					/ 2;
			progressTimeline
					.addPropertyToInterpolate("xPosition", startX, endX);

			KeyValues<Float> alphaValues = KeyValues.create(0.0f, 1.0f, 1.0f,
					0.0f);
			KeyTimes alphaTimes = new KeyTimes(0.0f, 0.3f, 0.7f, 1.0f);
			progressTimeline.addPropertyToInterpolate("alpha",
					new KeyFrames<Float>(alphaValues, alphaTimes));

			progressTimeline.setDuration(1500);
			progressTimeline.playLoop(RepeatBehavior.LOOP);
		}

		@Override
		protected void paintComponent(Graphics g) {
			Graphics2D g2d = (Graphics2D) g.create();
			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
					RenderingHints.VALUE_ANTIALIAS_ON);

			int w = getWidth();
			int h = getHeight();

			// Full background
			g2d.setColor(new Color(12, 12, 12));
			g2d.fillRect(0, 0, w, h);

			if (!started) {
				g2d.setColor(Color.white);
				g2d.setFont(new Font("Tahoma", Font.PLAIN, 18));
				String caption = "Click to start";
				g2d.drawString(caption, (w - g2d.getFontMetrics().stringWidth(
						caption)) / 2, h / 3);
			}

			// Inner gradient fill
			Shape innerContour = new RoundRectangle2D.Double(
					(w - INNER_WIDTH) / 2.0, (h - INNER_HEIGHT) / 2.0,
					INNER_WIDTH, INNER_HEIGHT, 10, 10);
			g2d.setPaint(new GradientPaint((w - INNER_WIDTH) / 2.0f,
					(h - INNER_HEIGHT) / 2.0f, new Color(47, 47, 47),
					(w - INNER_WIDTH) / 2.0f, (h + INNER_HEIGHT) / 2.0f,
					Color.black));
			g2d.fill(innerContour);

			// Inner contour
			g2d.setColor(new Color(67, 67, 67));
			g2d.draw(innerContour);

			// Progress track
			int trackWidth = INNER_WIDTH - 36;
			int trackHeight = 1;
			g2d.setColor(new Color(91, 91, 91));
			for (int i = 2; i >= 0; i--) {
				Shape trackContour = new RoundRectangle2D.Double(
						(w - INNER_WIDTH) / 2 + 18 - i, h / 2 - i - 1,
						trackWidth + i * 2, trackHeight + i * 2, 2 * i, 2 * i);
				float alpha = 1.0f;
				if (i == 1)
					alpha = 0.3f;
				if (i == 2)
					alpha = 0.1f;
				g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
				g2d.draw(trackContour);
			}

			// Highlighter
			g2d.setColor(new Color(13, 106, 206));
			g2d.setComposite(AlphaComposite.SrcOver.derive(0.1f * this.alpha));
			for (int i = 6; i >= 0; i--) {
				g2d.fillOval(this.xPosition - HIGHLIGHTER_WIDTH / 2 - i, h / 2
						- HIGHLIGHTER_HEIGHT / 2 - i,
						HIGHLIGHTER_WIDTH + 2 * i, HIGHLIGHTER_HEIGHT + 2 * i);
			}

			// Highlighter on track
			g2d.setComposite(AlphaComposite.SrcOver.derive(this.alpha));
			g2d.setColor(new Color(136, 182, 231));
			g2d.fillRect(this.xPosition - 28, h / 2 - 1, 56, 2);

			g2d.dispose();
		}

		public void setXPosition(int position) {
			xPosition = position;
		}

		public void setAlpha(float alpha) {
			this.alpha = alpha;
		}
	}

	public ProgressIndication() {
		super("Swing progress");

		this.add(new ProgressPanel());

		this.setSize(400, 300);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				new ProgressIndication().setVisible(true);
			}
		});
	}

}