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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package javax.swing.colorchooser;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import sun.swing.SwingUtilities2;


The standard preview panel for the color chooser.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.

Author:Steve Wilson
See Also:
/** * The standard preview panel for the color chooser. * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing. As of 1.4, support for long term storage * of all JavaBeans&trade; * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @author Steve Wilson * @see JColorChooser */
@SuppressWarnings("serial") // Same-version serialization only class DefaultPreviewPanel extends JPanel { private int squareSize = 25; private int squareGap = 5; private int innerGap = 5; private int textGap = 5; private Font font = new Font(Font.DIALOG, Font.PLAIN, 12); private String sampleText; private int swatchWidth = 50; private Color oldColor = null; private JColorChooser getColorChooser() { return (JColorChooser)SwingUtilities.getAncestorOfClass( JColorChooser.class, this); } public Dimension getPreferredSize() { JComponent host = getColorChooser(); if (host == null) { host = this; } FontMetrics fm = host.getFontMetrics(getFont()); int ascent = fm.getAscent(); int height = fm.getHeight(); int width = SwingUtilities2.stringWidth(host, fm, getSampleText()); int y = height*3 + textGap*3; int x = squareSize * 3 + squareGap*2 + swatchWidth + width + textGap*3; return new Dimension( x,y ); } public void paintComponent(Graphics g) { if (oldColor == null) oldColor = getForeground(); g.setColor(getBackground()); g.fillRect(0,0,getWidth(),getHeight()); if (this.getComponentOrientation().isLeftToRight()) { int squareWidth = paintSquares(g, 0); int textWidth = paintText(g, squareWidth); paintSwatch(g, squareWidth + textWidth); } else { int swatchWidth = paintSwatch(g, 0); int textWidth = paintText(g, swatchWidth); paintSquares(g , swatchWidth + textWidth); } } private int paintSwatch(Graphics g, int offsetX) { int swatchX = offsetX; g.setColor(oldColor); g.fillRect(swatchX, 0, swatchWidth, (squareSize) + (squareGap/2)); g.setColor(getForeground()); g.fillRect(swatchX, (squareSize) + (squareGap/2), swatchWidth, (squareSize) + (squareGap/2) ); return (swatchX+swatchWidth); } private int paintText(Graphics g, int offsetX) { g.setFont(getFont()); JComponent host = getColorChooser(); if (host == null) { host = this; } FontMetrics fm = SwingUtilities2.getFontMetrics(host, g); int ascent = fm.getAscent(); int height = fm.getHeight(); int width = SwingUtilities2.stringWidth(host, fm, getSampleText()); int textXOffset = offsetX + textGap; Color color = getForeground(); g.setColor(color); SwingUtilities2.drawString(host, g, getSampleText(),textXOffset+(textGap/2), ascent+2); g.fillRect(textXOffset, ( height) + textGap, width + (textGap), height +2); g.setColor(Color.black); SwingUtilities2.drawString(host, g, getSampleText(), textXOffset+(textGap/2), height+ascent+textGap+2); g.setColor(Color.white); g.fillRect(textXOffset, ( height + textGap) * 2, width + (textGap), height +2); g.setColor(color); SwingUtilities2.drawString(host, g, getSampleText(), textXOffset+(textGap/2), ((height+textGap) * 2)+ascent+2); return width + textGap*3; } private int paintSquares(Graphics g, int offsetX) { int squareXOffset = offsetX; Color color = getForeground(); g.setColor(Color.white); g.fillRect(squareXOffset,0,squareSize,squareSize); g.setColor(color); g.fillRect(squareXOffset+innerGap, innerGap, squareSize - (innerGap*2), squareSize - (innerGap*2)); g.setColor(Color.white); g.fillRect(squareXOffset+innerGap*2, innerGap*2, squareSize - (innerGap*4), squareSize - (innerGap*4)); g.setColor(color); g.fillRect(squareXOffset,squareSize+squareGap,squareSize,squareSize); g.translate(squareSize+squareGap, 0); g.setColor(Color.black); g.fillRect(squareXOffset,0,squareSize,squareSize); g.setColor(color); g.fillRect(squareXOffset+innerGap, innerGap, squareSize - (innerGap*2), squareSize - (innerGap*2)); g.setColor(Color.white); g.fillRect(squareXOffset+innerGap*2, innerGap*2, squareSize - (innerGap*4), squareSize - (innerGap*4)); g.translate(-(squareSize+squareGap), 0); g.translate(squareSize+squareGap, squareSize+squareGap); g.setColor(Color.white); g.fillRect(squareXOffset,0,squareSize,squareSize); g.setColor(color); g.fillRect(squareXOffset+innerGap, innerGap, squareSize - (innerGap*2), squareSize - (innerGap*2)); g.translate(-(squareSize+squareGap), -(squareSize+squareGap)); g.translate((squareSize+squareGap)*2, 0); g.setColor(Color.white); g.fillRect(squareXOffset,0,squareSize,squareSize); g.setColor(color); g.fillRect(squareXOffset+innerGap, innerGap, squareSize - (innerGap*2), squareSize - (innerGap*2)); g.setColor(Color.black); g.fillRect(squareXOffset+innerGap*2, innerGap*2, squareSize - (innerGap*4), squareSize - (innerGap*4)); g.translate(-((squareSize+squareGap)*2), 0); g.translate((squareSize+squareGap)*2, (squareSize+squareGap)); g.setColor(Color.black); g.fillRect(squareXOffset,0,squareSize,squareSize); g.setColor(color); g.fillRect(squareXOffset+innerGap, innerGap, squareSize - (innerGap*2), squareSize - (innerGap*2)); g.translate(-((squareSize+squareGap)*2), -(squareSize+squareGap)); return (squareSize*3+squareGap*2); } private String getSampleText() { if (this.sampleText == null) { this.sampleText = UIManager.getString("ColorChooser.sampleText", getLocale()); } return this.sampleText; } }