Java tutorial
/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle or the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package layout; /* * BoxAlignmentDemo.java requires the following files: * images/middle.gif * images/geek-cght.gif * * This demo shows how to specify alignments when you're using * a BoxLayout for components with maximum sizes and different * default alignments. */ import javax.swing.*; import javax.swing.border.*; import java.awt.*; public class BoxAlignmentDemo extends JPanel { public BoxAlignmentDemo() { super(new BorderLayout()); JTabbedPane tabbedPane = new JTabbedPane(); JPanel buttonRow = new JPanel(); //Use default FlowLayout. buttonRow.add(createButtonRow(false)); buttonRow.add(createButtonRow(true)); tabbedPane.addTab("Altering alignments", buttonRow); JPanel labelAndComponent = new JPanel(); //Use default FlowLayout. labelAndComponent.add(createLabelAndComponent(false)); labelAndComponent.add(createLabelAndComponent(true)); tabbedPane.addTab("X alignment mismatch", labelAndComponent); JPanel buttonAndComponent = new JPanel(); //Use default FlowLayout. buttonAndComponent.add(createYAlignmentExample(false)); buttonAndComponent.add(createYAlignmentExample(true)); tabbedPane.addTab("Y alignment mismatch", buttonAndComponent); //Add tabbedPane to this panel. add(tabbedPane, BorderLayout.CENTER); } protected JPanel createButtonRow(boolean changeAlignment) { JButton button1 = new JButton("A JButton", createImageIcon("images/middle.gif")); button1.setVerticalTextPosition(AbstractButton.BOTTOM); button1.setHorizontalTextPosition(AbstractButton.CENTER); JButton button2 = new JButton("Another JButton", createImageIcon("images/geek-cght.gif")); button2.setVerticalTextPosition(AbstractButton.BOTTOM); button2.setHorizontalTextPosition(AbstractButton.CENTER); String title; if (changeAlignment) { title = "Desired"; button1.setAlignmentY(BOTTOM_ALIGNMENT); button2.setAlignmentY(BOTTOM_ALIGNMENT); } else { title = "Default"; } JPanel pane = new JPanel(); pane.setBorder(BorderFactory.createTitledBorder(title)); pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS)); pane.add(button1); pane.add(button2); return pane; } protected JPanel createLabelAndComponent(boolean doItRight) { JPanel pane = new JPanel(); JComponent component = new JPanel(); Dimension size = new Dimension(150, 100); component.setMaximumSize(size); component.setPreferredSize(size); component.setMinimumSize(size); TitledBorder border = new TitledBorder(new LineBorder(Color.black), "A JPanel", TitledBorder.CENTER, TitledBorder.BELOW_TOP); border.setTitleColor(Color.black); component.setBorder(border); JLabel label = new JLabel("This is a JLabel"); String title; if (doItRight) { title = "Matched"; label.setAlignmentX(CENTER_ALIGNMENT); } else { title = "Mismatched"; } pane.setBorder(BorderFactory.createTitledBorder(title)); pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS)); pane.add(label); pane.add(component); return pane; } protected JPanel createYAlignmentExample(boolean doItRight) { JPanel pane = new JPanel(); String title; JComponent component1 = new JPanel(); Dimension size = new Dimension(100, 50); component1.setMaximumSize(size); component1.setPreferredSize(size); component1.setMinimumSize(size); TitledBorder border = new TitledBorder(new LineBorder(Color.black), "A JPanel", TitledBorder.CENTER, TitledBorder.BELOW_TOP); border.setTitleColor(Color.black); component1.setBorder(border); JComponent component2 = new JPanel(); size = new Dimension(100, 50); component2.setMaximumSize(size); component2.setPreferredSize(size); component2.setMinimumSize(size); border = new TitledBorder(new LineBorder(Color.black), "A JPanel", TitledBorder.CENTER, TitledBorder.BELOW_TOP); border.setTitleColor(Color.black); component2.setBorder(border); if (doItRight) { title = "Matched"; } else { component1.setAlignmentY(TOP_ALIGNMENT); title = "Mismatched"; } pane.setBorder(BorderFactory.createTitledBorder(title)); pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS)); pane.add(component1); pane.add(component2); return pane; } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = BoxAlignmentDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("BoxAlignmentDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. BoxAlignmentDemo newContentPane = new BoxAlignmentDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }