GridBagConstraints.gridwidth : GridBagConstraints « java.awt « Java by API






GridBagConstraints.gridwidth

 

/*
 *
 * 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.
 */


/*
 * ContainerEventDemo.java requires no other files.
 */

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ContainerEvent;
import java.awt.event.ContainerListener;
import java.util.Vector;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Main extends JPanel implements ContainerListener, ActionListener {
  JTextArea display;

  JPanel buttonPanel;

  JButton addButton, removeButton, clearButton;

  Vector<JButton> buttonList;

  static final String ADD = "add";

  static final String REMOVE = "remove";

  static final String CLEAR = "clear";

  static final String newline = "\n";

  public Main() {
    super(new GridBagLayout());
    GridBagLayout gridbag = (GridBagLayout) getLayout();
    GridBagConstraints c = new GridBagConstraints();

    // Initialize an empty list of buttons.
    buttonList = new Vector<JButton>(10, 10);

    // Create all the components.
    addButton = new JButton("Add a button");
    addButton.setActionCommand(ADD);
    addButton.addActionListener(this);

    removeButton = new JButton("Remove a button");
    removeButton.setActionCommand(REMOVE);
    removeButton.addActionListener(this);

    buttonPanel = new JPanel(new GridLayout(1, 1));
    buttonPanel.setPreferredSize(new Dimension(200, 75));
    buttonPanel.addContainerListener(this);

    display = new JTextArea();
    display.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(display);
    scrollPane.setPreferredSize(new Dimension(200, 75));

    clearButton = new JButton("Clear text area");
    clearButton.setActionCommand(CLEAR);
    clearButton.addActionListener(this);

    c.fill = GridBagConstraints.BOTH; // Fill entire cell.
    c.weighty = 1.0; // Button area and message area have equal height.
    c.gridwidth = GridBagConstraints.REMAINDER; // end of row
    gridbag.setConstraints(scrollPane, c);
    add(scrollPane);

    c.weighty = 0.0;
    gridbag.setConstraints(clearButton, c);
    add(clearButton);

    c.weightx = 1.0; // Add/remove buttons have equal width.
    c.gridwidth = 1; // NOT end of row
    gridbag.setConstraints(addButton, c);
    add(addButton);

    c.gridwidth = GridBagConstraints.REMAINDER; // end of row
    gridbag.setConstraints(removeButton, c);
    add(removeButton);

    c.weighty = 1.0; // Button area and message area have equal height.
    gridbag.setConstraints(buttonPanel, c);
    add(buttonPanel);

    setPreferredSize(new Dimension(400, 400));
    setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
  }

  public void componentAdded(ContainerEvent e) {
    displayMessage(" added to ", e);
  }

  public void componentRemoved(ContainerEvent e) {
    displayMessage(" removed from ", e);
  }

  void displayMessage(String action, ContainerEvent e) {
    display.append(((JButton) e.getChild()).getText() + " was" + action
        + e.getContainer().getClass().getName() + newline);
    display.setCaretPosition(display.getDocument().getLength());
  }

  /*
   * This could have been implemented as two or three classes or objects, for
   * clarity.
   */
  public void actionPerformed(ActionEvent e) {
    String command = e.getActionCommand();

    if (ADD.equals(command)) {
      JButton newButton = new JButton("JButton #" + (buttonList.size() + 1));
      buttonList.addElement(newButton);
      buttonPanel.add(newButton);
      buttonPanel.revalidate(); // Make the button show up.

    } else if (REMOVE.equals(command)) {
      int lastIndex = buttonList.size() - 1;
      try {
        JButton nixedButton = buttonList.elementAt(lastIndex);
        buttonPanel.remove(nixedButton);
        buttonList.removeElementAt(lastIndex);
        buttonPanel.revalidate(); // Make the button disappear.
        buttonPanel.repaint(); // Make the button disappear.
      } catch (ArrayIndexOutOfBoundsException exc) {
      }
    } else if (CLEAR.equals(command)) {
      display.setText("");
    }
  }

  /**
   * 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("ContainerEventDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create and set up the content pane.
    JComponent newContentPane = new Main();
    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();
      }
    });
  }
}

   
  








Related examples in the same category

1.GridBagConstraints.BOTH
2.GridBagConstraints.CENTER
3.GridBagConstraints.NONE
4.GridBagConstraints.RELATIVE
5.new GridBagConstraints()
6.new GridBagConstraints(int gx, int gy, int gw, int gh, double wx, double wy, int a, int f, Insets i, int ipx, int ipy)
7.GridBagConstraints.fill
8.GridBagConstraints.gridheight
9.GridBagConstraints.gridx
10.GridBagConstraints.gridy
11.GridBagConstraints.ipadx
12.GridBagConstraints.ipady
13.GridBagConstraints.weightx
14.GridBagConstraints.weighty