PenWidthChooser.java

/*
 * This software copyright by various authors including the RPTools.net
 * development team, and licensed under the LGPL Version 3 or, at your option,
 * any later version.
 *
 * Portions of this software were originally covered under the Apache Software
 * License, Version 1.1 or Version 2.0.
 *
 * See the file LICENSE elsewhere in this distribution for license details.
 */

package net.rptools.maptool.client.swing;

import java.awt.BasicStroke;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.util.HashMap;
import java.util.Map;

import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListCellRenderer;
import javax.swing.Icon;
import javax.swing.JComboBox;
import javax.swing.JList;

import net.rptools.maptool.model.drawing.Pen;

/**
 * Combo box showing the available pen widths and a preview of each.
 * 
 * @author Jay
 * @version $Revision: 5945 $ $Date: 2013-06-03 04:35:50 +0930 (Mon, 03 Jun 2013) $ $Author:&
 */
public class PenWidthChooser extends JComboBox {

	/**
	 * The renderer for this chooser.
	 */
	private PenListRenderer renderer = new PenListRenderer();

	/**
	 * Supported Pen Widths
	 */
	public static final int[] WIDTHS = { 1, 3, 5, 7, 11, 15, 21 };

	/**
	 * The width that the Icon is painted.
	 */
	public static final int ICON_WIDTH = 25;

	/**
	 * The maximum number of eleemnts in the list before it scrolls
	 */
	public static final int MAX_ROW_COUNT = 10;

	/**
	 * Create the renderer and model for the combo box
	 */
	public PenWidthChooser() {
		setRenderer(renderer);
		DefaultComboBoxModel model = new DefaultComboBoxModel();
		int selected = -1;
		int defaultThickness = (int) Pen.DEFAULT.getThickness();
		for (int i = 0; i < WIDTHS.length; i += 1) {
			model.addElement(WIDTHS[i]);
			renderer.icon.strokes.put(WIDTHS[i], new BasicStroke(WIDTHS[i], BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER));
			if (WIDTHS[i] == defaultThickness)
				selected = i;
		} // endfor

		// Set up the component
		setModel(model);
		setMaximumSize(getPreferredSize());
		setMaximumRowCount(MAX_ROW_COUNT);
		setSelectedIndex(Math.max(selected, WIDTHS[0]));
	}

	/**
	 * Renderer for the items in the combo box
	 * 
	 * @author jgorrell
	 * @version $Revision: 5945 $ $Date: 2013-06-03 04:35:50 +0930 (Mon, 03 Jun 2013) $ $Author: azhrei_fje $
	 */
	private class PenListRenderer extends DefaultListCellRenderer {

		/**
		 * Icon used to draw the line sample
		 */
		PenIcon icon = new PenIcon();

		/**
		 * @see javax.swing.ListCellRenderer#getListCellRendererComponent(javax.swing.JList, java.lang.Object, int, boolean, boolean)
		 */
		@Override
		public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {

			// Sets the text, clears the icon
			super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);

			// Set the icon
			icon.width = (Integer) value;
			setIcon(icon);
			return this;
		}
	}

	/**
	 * Icon for the renderer
	 * 
	 * @author jgorrell
	 * @version $Revision: 5945 $ $Date: 2013-06-03 04:35:50 +0930 (Mon, 03 Jun 2013) $ $Author: azhrei_fje $
	 */
	private class PenIcon implements Icon {

		/**
		 * Pen used in drawing.
		 */
		private int width = 0;

		/**
		 * Strokes for this icon
		 */
		private Map<Integer, Stroke> strokes = new HashMap<Integer, Stroke>();

		/**
		 * @see javax.swing.Icon#getIconHeight()
		 */
		public int getIconHeight() {
			return getHeight();
		}

		/**
		 * @see javax.swing.Icon#getIconWidth()
		 */
		public int getIconWidth() {
			return ICON_WIDTH;
		}

		/**
		 * @see javax.swing.Icon#paintIcon(java.awt.Component, java.awt.Graphics, int, int)
		 */
		public void paintIcon(Component c, Graphics g, int x, int y) {

			// Fill the background
			Graphics2D g2d = (Graphics2D) g;
			g2d.setColor(c.getBackground());
			g2d.fillRect(x, y, getIconWidth(), getIconHeight());

			// Draw a line centered in the foreground
			g2d.setColor(c.getForeground());
			g2d.setStroke(strokes.get(width));
			int yCentered = y + getIconHeight() / 2;
			g2d.drawLine(x, yCentered, x + getIconWidth(), yCentered);
		}
	}
}