Java tutorial
/* * * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved. * * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use, * modify and redistribute this software in source and binary code form, * provided that i) this copyright notice and license appear on all copies of * the software; and ii) Licensee does not utilize the software in a manner * which is disparaging to Sun. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. * * This software is not designed or intended for use in on-line control of * aircraft, air traffic, aircraft navigation or aircraft communications; or in * the design, construction, operation or maintenance of any nuclear * facility. Licensee represents and warrants that it will not use or * redistribute the Software for such purposes. */ import java.awt.Color; import java.awt.Dimension; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.ImageIcon; import javax.swing.JCheckBox; import javax.swing.JComboBox; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JLayeredPane; import javax.swing.JPanel; public class LayeredPaneDemo extends JPanel implements ActionListener, MouseMotionListener { private String[] layerStrings = { "Yellow (0)", "Magenta (1)", "Cyan (2)", "Red (3)", "Green (4)" }; private Color[] layerColors = { Color.yellow, Color.magenta, Color.cyan, Color.red, Color.green }; private JLayeredPane layeredPane; private JLabel dukeLabel; private JCheckBox onTop; private JComboBox layerList; // Action commands private static String ON_TOP_COMMAND = "ontop"; private static String LAYER_COMMAND = "layer"; // Adjustments to put Duke's toe at the cursor's tip. private static final int XFUDGE = 40; private static final int YFUDGE = 57; public LayeredPaneDemo() { setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS)); // Create and load the duke icon. final ImageIcon icon = new ImageIcon("yourFile.gif"); // Create and set up the layered pane. layeredPane = new JLayeredPane(); layeredPane.setPreferredSize(new Dimension(300, 310)); layeredPane.setBorder(BorderFactory.createTitledBorder("Move the Mouse to Move Duke")); layeredPane.addMouseMotionListener(this); // This is the origin of the first label added. Point origin = new Point(10, 20); // This is the offset for computing the origin for the next label. int offset = 35; // Add several overlapping, colored labels to the layered pane // using absolute positioning/sizing. for (int i = 0; i < layerStrings.length; i++) { JLabel label = createColoredLabel(layerStrings[i], layerColors[i], origin); layeredPane.add(label, new Integer(i)); origin.x += offset; origin.y += offset; } // Create and add the Duke label to the layered pane. dukeLabel = new JLabel(icon); if (icon != null) { dukeLabel.setBounds(15, 225, icon.getIconWidth(), icon.getIconHeight()); } else { System.err.println("Duke icon not found; using black square instead."); dukeLabel.setBounds(15, 225, 30, 30); dukeLabel.setOpaque(true); dukeLabel.setBackground(Color.BLACK); } layeredPane.add(dukeLabel, new Integer(2), 0); // Add control pane and layered pane to this JPanel. add(Box.createRigidArea(new Dimension(0, 10))); add(createControlPanel()); add(Box.createRigidArea(new Dimension(0, 10))); add(layeredPane); } private JLabel createColoredLabel(String text, Color color, Point origin) { JLabel label = new JLabel(text); label.setVerticalAlignment(JLabel.TOP); label.setHorizontalAlignment(JLabel.CENTER); label.setOpaque(true); label.setBackground(color); label.setForeground(Color.black); label.setBorder(BorderFactory.createLineBorder(Color.black)); label.setBounds(origin.x, origin.y, 140, 140); return label; } // Create the control pane for the top of the frame. private JPanel createControlPanel() { onTop = new JCheckBox("Top Position in Layer"); onTop.setSelected(true); onTop.setActionCommand(ON_TOP_COMMAND); onTop.addActionListener(this); layerList = new JComboBox(layerStrings); layerList.setSelectedIndex(2); // cyan layer layerList.setActionCommand(LAYER_COMMAND); layerList.addActionListener(this); JPanel controls = new JPanel(); controls.add(layerList); controls.add(onTop); controls.setBorder(BorderFactory.createTitledBorder("Choose Duke's Layer and Position")); return controls; } // Make Duke follow the cursor. public void mouseMoved(MouseEvent e) { dukeLabel.setLocation(e.getX() - XFUDGE, e.getY() - YFUDGE); } public void mouseDragged(MouseEvent e) { } // do nothing public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); if (ON_TOP_COMMAND.equals(cmd)) { if (onTop.isSelected()) layeredPane.moveToFront(dukeLabel); else layeredPane.moveToBack(dukeLabel); } else if (LAYER_COMMAND.equals(cmd)) { int position = onTop.isSelected() ? 0 : 1; layeredPane.setLayer(dukeLabel, layerList.getSelectedIndex(), position); } } public static void main(String[] args) { JFrame frame = new JFrame("LayeredPaneDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Create and set up the content pane. JComponent newContentPane = new LayeredPaneDemo(); newContentPane.setOpaque(true); // content panes must be opaque frame.setContentPane(newContentPane); // Display the window. frame.pack(); frame.setVisible(true); } }