Swing换肤——JavaSE技术

package com.han.lnf; import java.awt.AWTEvent; import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.RadialGradientPaint; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.geom.Point2D; import java.text.ParseException; import javax.swing.ButtonGroup; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JLayer; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JTextField; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.WindowConstants; import javax.swing.plaf.LayerUI; import javax.swing.plaf.synth.SynthLookAndFeel; /** * Use a spotlight layer as JLayer to render JFrame. * * @author Administrator */ public class JSpotlightLayer extends JPanel { private static final long serialVersionUID = -3416068588759196883L; private static JButton orderButton; public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { @Override public void run() { createAndShowGUI(); } }); } private static void createAndShowGUI() { initLookAndFeel();// specify the L&F LayerUI<JPanel> layerUI = new SpotlightLayerUI(); JPanel contentPane = new JSpotlightLayer(); JLayer<JPanel> jlayer = new JLayer<>(contentPane, layerUI); final JFrame f = new JFrame("JSpotlightLayer"); f.add(jlayer); f.getRootPane().setDefaultButton(orderButton); f.setSize(270, 185); f.setResizable(false); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); f.setVisible(true); } private static void initLookAndFeel() { SynthLookAndFeel lookAndFeel = new SynthLookAndFeel(); try { lookAndFeel.load(JSpotlightLayer.class .getResourceAsStream("lnfimpl/synth.xml"), JSpotlightLayer.class); } catch (ParseException e) { System.err.println("There is an error in parsing xml of Synth"); e.printStackTrace(); } try { UIManager.setLookAndFeel(lookAndFeel); } catch (UnsupportedLookAndFeelException e) { System.err.println("Synth is not a supported look and feel"); e.printStackTrace(); } } private static class SpotlightLayerUI extends LayerUI<JPanel> { private static final long serialVersionUID = -2815331572730280489L; private boolean mActive; private int mX, mY; @Override public void installUI(JComponent c) { super.installUI(c); @SuppressWarnings("unchecked") JLayer<JPanel> jlayer = (JLayer<JPanel>) c; jlayer.setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK); } @Override public void uninstallUI(JComponent c) { super.uninstallUI(c); @SuppressWarnings("unchecked") JLayer<JPanel> jlayer = (JLayer<JPanel>) c; jlayer.setLayerEventMask(0); } @Override public void paint(Graphics g, JComponent c) { super.paint(g, c); Graphics2D g2 = (Graphics2D) g.create(); if (mActive) { /* Create a radial gradient, transparent in the middle */ Point2D center = new Point2D.Float(mX, mY); float radius = 72; float[] dist = { 0.0f, 1.0f }; Color[] colors = { new Color(0.0f, 0.0f, 0.0f, 0.0f), Color.BLACK }; RadialGradientPaint p = new RadialGradientPaint(center, radius, dist, colors); g2.setPaint(p); g2.setComposite(AlphaComposite.getInstance( AlphaComposite.SRC_OVER, .6f)); g2.fillRect(0, 0, c.getWidth(), c.getHeight()); } g2.dispose(); } @Override protected void processMouseEvent(MouseEvent e, JLayer<? extends JPanel> l) { if (e.getID() == MouseEvent.MOUSE_ENTERED) { mActive = true; } else if (e.getID() == MouseEvent.MOUSE_EXITED) { mActive = false; } l.repaint(); } @Override protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends JPanel> l) { Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), l); mX = p.x; mY = p.y; l.repaint(); } } JSpotlightLayer() { ButtonGroup entreeGroup = new ButtonGroup(); JRadioButton radioButton = new JRadioButton("Beef", true); JRadioButton radioButton2 = new JRadioButton("Chicken"); JRadioButton radioButton3 = new JRadioButton("Vegetable"); entreeGroup.add(radioButton); entreeGroup.add(radioButton2); entreeGroup.add(radioButton3); JCheckBox jCheckBox = new JCheckBox("Ketchup"); JCheckBox jCheckBox2 = new JCheckBox("Mustard"); JCheckBox jCheckBox3 = new JCheckBox("Pickles"); JLabel label = new JLabel("Special requests:"); JTextField tf = new JTextField(15); final JLabel info = new JLabel(); info.setName("customLabel"); orderButton = new JButton("Place Order"); orderButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { info.setText("default button clicked"); } }); JButton cancelButton = new JButton("Cancel"); cancelButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { info.setText("cancel button clicked"); } }); add(radioButton); add(radioButton2); add(radioButton3); add(jCheckBox); add(jCheckBox2); add(jCheckBox3); add(label); add(tf); add(orderButton); add(cancelButton); add(info); } }