Java examples for Swing:BoxLayout
Create Box Layout and change x alignment
/*/*from w w w . j a va 2 s .c o m*/ * BoxLayoutDemo2.java requires one other file: BLDComponent.java */ import java.awt.*; import java.awt.event.*; import javax.swing.*; /* * Used by BoxLayoutDemo.java. */ import java.awt.*; import java.awt.event.*; import javax.swing.*; /** A rectangle that has a fixed size. */ class BLDComponent extends JComponent implements MouseListener { private Color normalHue; private final Dimension preferredSize; private String name; private boolean restrictMaximumSize; private boolean printSize; public BLDComponent(float alignmentX, float hue, int shortSideSize, boolean restrictSize, boolean printSize, String name) { this.name = name; this.restrictMaximumSize = restrictSize; this.printSize = printSize; setAlignmentX(alignmentX); normalHue = Color.getHSBColor(hue, 0.4f, 0.85f); preferredSize = new Dimension(shortSideSize * 2, shortSideSize); addMouseListener(this); } //The MouseListener interface requires that we define //mousePressed, mouseReleased, mouseEntered, mouseExited, //and mouseClicked. public void mousePressed(MouseEvent e) { int width = getWidth(); float alignment = (float) (e.getX()) / (float) width; // Round to the nearest 1/10th. int tmp = Math.round(alignment * 10.0f); alignment = (float) tmp / 10.0f; setAlignmentX(alignment); revalidate(); // this GUI needs relayout repaint(); } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } public void mouseClicked(MouseEvent e) { } /** * Our BLDComponents are completely opaque, so we override * this method to return true. This lets the painting * system know that it doesn't need to paint any covered * part of the components underneath this component. The * end result is possibly improved painting performance. */ public boolean isOpaque() { return true; } public void paint(Graphics g) { int width = getWidth(); int height = getHeight(); float alignmentX = getAlignmentX(); g.setColor(normalHue); g.fill3DRect(0, 0, width, height, true); /* Draw a vertical white line at the alignment point.*/ // XXX: This code is probably not the best. g.setColor(Color.white); int x = (int) (alignmentX * (float) width) - 1; g.drawLine(x, 0, x, height - 1); /* Say what the alignment point is. */ g.setColor(Color.black); g.drawString(Float.toString(alignmentX), 3, height - 3); if (printSize) { System.out.println("BLDComponent " + name + ": size is " + width + "x" + height + "; preferred size is " + getPreferredSize().width + "x" + getPreferredSize().height); } } public Dimension getPreferredSize() { return preferredSize; } public Dimension getMinimumSize() { return preferredSize; } public Dimension getMaximumSize() { if (restrictMaximumSize) { return preferredSize; } else { return super.getMaximumSize(); } } public void setSizeRestriction(boolean restrictSize) { restrictMaximumSize = restrictSize; } } public class BoxLayoutDemo2 implements ItemListener { protected static int NUM_COMPONENTS = 3; protected static float[] xAlignment = { Component.LEFT_ALIGNMENT, Component.CENTER_ALIGNMENT, Component.RIGHT_ALIGNMENT }; protected static float[] hue = { 0.0f, 0.33f, 0.67f }; protected static boolean restrictSize = true; protected static boolean sizeIsRandom = false; protected static BLDComponent[] bldComponent = new BLDComponent[NUM_COMPONENTS]; public void populateContentPane(Container contentPane) { JPanel panel = new JPanel(); panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS)); //Create the rectangles. int shortSideSize = 15; for (int i = 0; i < NUM_COMPONENTS; i++) { if (sizeIsRandom) { shortSideSize = (int) (30.0 * Math.random()) + 30; } else { shortSideSize += 10; } bldComponent[i] = new BLDComponent(xAlignment[i], hue[i], shortSideSize, restrictSize, sizeIsRandom, String.valueOf(i)); panel.add(bldComponent[i]); } //Create the instructions. JLabel label = new JLabel("Click a rectangle to " + "change its X alignment."); JCheckBox cb = new JCheckBox("Restrict maximum rectangle size."); cb.setSelected(restrictSize); cb.addItemListener(this); panel.setBorder(BorderFactory.createLineBorder(Color.red)); Box box = Box.createVerticalBox(); box.add(label); box.add(cb); contentPane.add(panel, BorderLayout.CENTER); contentPane.add(box, BorderLayout.PAGE_END); } public void itemStateChanged(ItemEvent e) { if (e.getStateChange() == ItemEvent.SELECTED) { restrictSize = true; } else { restrictSize = false; } notifyBLDComponents(); } static public void notifyBLDComponents() { for (int i = 0; i < NUM_COMPONENTS; i++) { bldComponent[i].setSizeRestriction(restrictSize); } bldComponent[0].revalidate(); } /** * 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("BoxLayoutDemo2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. BoxLayoutDemo2 demo = new BoxLayoutDemo2(); demo.populateContentPane(frame.getContentPane()); //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(); } }); } } /* * 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. */