Spring Form : Layout « Swing JFC « Java

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Java » Swing JFC » Layout 




Spring Form
Spring Form
      
/* From http://java.sun.com/docs/books/tutorial/index.html */

/*
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 *
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 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution 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 Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
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 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
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 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * A 1.4 application that uses SpringLayout to create a forms-type layout. Other
 * files required: SpringUtilities.java.
 */

import java.awt.Component;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Spring;
import javax.swing.SpringLayout;

public class SpringForm {
  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    String[] labels = "Name: ""Fax: ""Email: ""Address: " };
    int numPairs = labels.length;

    //Create and populate the panel.
    JPanel p = new JPanel(new SpringLayout());
    for (int i = 0; i < numPairs; i++) {
      JLabel l = new JLabel(labels[i], JLabel.TRAILING);
      p.add(l);
      JTextField textField = new JTextField(10);
      l.setLabelFor(textField);
      p.add(textField);
    }

    //Lay out the panel.
    SpringUtilities.makeCompactGrid(p, numPairs, 2//rows, cols
        66//initX, initY
        66)//xPad, yPad

    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);

    //Create and set up the window.
    JFrame frame = new JFrame("SpringForm");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Set up the content pane.
    p.setOpaque(true)//content panes must be opaque
    frame.setContentPane(p);

    //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();
      }
    });
  }
}

/**
 * A 1.4 file that provides utility methods for creating form- or grid-style
 * layouts with SpringLayout. These utilities are used by several programs, such
 * as SpringBox and SpringCompactGrid.
 */

class SpringUtilities {
  /**
   * A debugging utility that prints to stdout the component's minimum,
   * preferred, and maximum sizes.
   */
  public static void printSizes(Component c) {
    System.out.println("minimumSize = " + c.getMinimumSize());
    System.out.println("preferredSize = " + c.getPreferredSize());
    System.out.println("maximumSize = " + c.getMaximumSize());
  }

  /**
   * Aligns the first <code>rows</code>*<code>cols</code> components of
   * <code>parent</code> in a grid. Each component is as big as the maximum
   * preferred width and height of the components. The parent is made just big
   * enough to fit them all.
   
   @param rows
   *            number of rows
   @param cols
   *            number of columns
   @param initialX
   *            x location to start the grid at
   @param initialY
   *            y location to start the grid at
   @param xPad
   *            x padding between cells
   @param yPad
   *            y padding between cells
   */
  public static void makeGrid(Container parent, int rows, int cols,
      int initialX, int initialY, int xPad, int yPad) {
    SpringLayout layout;
    try {
      layout = (SpringLayoutparent.getLayout();
    catch (ClassCastException exc) {
      System.err
          .println("The first argument to makeGrid must use SpringLayout.");
      return;
    }

    Spring xPadSpring = Spring.constant(xPad);
    Spring yPadSpring = Spring.constant(yPad);
    Spring initialXSpring = Spring.constant(initialX);
    Spring initialYSpring = Spring.constant(initialY);
    int max = rows * cols;

    //Calculate Springs that are the max of the width/height so that all
    //cells have the same size.
    Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0))
        .getWidth();
    Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0))
        .getWidth();
    for (int i = 1; i < max; i++) {
      SpringLayout.Constraints cons = layout.getConstraints(parent
          .getComponent(i));

      maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
      maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
    }

    //Apply the new width/height Spring. This forces all the
    //components to have the same size.
    for (int i = 0; i < max; i++) {
      SpringLayout.Constraints cons = layout.getConstraints(parent
          .getComponent(i));

      cons.setWidth(maxWidthSpring);
      cons.setHeight(maxHeightSpring);
    }

    //Then adjust the x/y constraints of all the cells so that they
    //are aligned in a grid.
    SpringLayout.Constraints lastCons = null;
    SpringLayout.Constraints lastRowCons = null;
    for (int i = 0; i < max; i++) {
      SpringLayout.Constraints cons = layout.getConstraints(parent
          .getComponent(i));
      if (i % cols == 0) { //start of new row
        lastRowCons = lastCons;
        cons.setX(initialXSpring);
      else //x position depends on previous component
        cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),
            xPadSpring));
      }

      if (i / cols == 0) { //first row
        cons.setY(initialYSpring);
      else //y position depends on previous row
        cons.setY(Spring.sum(lastRowCons
            .getConstraint(SpringLayout.SOUTH), yPadSpring));
      }
      lastCons = cons;
    }

    //Set the parent's size.
    SpringLayout.Constraints pCons = layout.getConstraints(parent);
    pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring
        .constant(yPad), lastCons.getConstraint(SpringLayout.SOUTH)));
    pCons.setConstraint(SpringLayout.EAST, Spring.sum(
        Spring.constant(xPad), lastCons
            .getConstraint(SpringLayout.EAST)));
  }

  /* Used by makeCompactGrid. */
  private static SpringLayout.Constraints getConstraintsForCell(int row,
      int col, Container parent, int cols) {
    SpringLayout layout = (SpringLayoutparent.getLayout();
    Component c = parent.getComponent(row * cols + col);
    return layout.getConstraints(c);
  }

  /**
   * Aligns the first <code>rows</code>*<code>cols</code> components of
   * <code>parent</code> in a grid. Each component in a column is as wide as
   * the maximum preferred width of the components in that column; height is
   * similarly determined for each row. The parent is made just big enough to
   * fit them all.
   
   @param rows
   *            number of rows
   @param cols
   *            number of columns
   @param initialX
   *            x location to start the grid at
   @param initialY
   *            y location to start the grid at
   @param xPad
   *            x padding between cells
   @param yPad
   *            y padding between cells
   */
  public static void makeCompactGrid(Container parent, int rows, int cols,
      int initialX, int initialY, int xPad, int yPad) {
    SpringLayout layout;
    try {
      layout = (SpringLayoutparent.getLayout();
    catch (ClassCastException exc) {
      System.err
          .println("The first argument to makeCompactGrid must use SpringLayout.");
      return;
    }

    //Align all cells in each column and make them the same width.
    Spring x = Spring.constant(initialX);
    for (int c = 0; c < cols; c++) {
      Spring width = Spring.constant(0);
      for (int r = 0; r < rows; r++) {
        width = Spring.max(width, getConstraintsForCell(r, c, parent,
            cols).getWidth());
      }
      for (int r = 0; r < rows; r++) {
        SpringLayout.Constraints constraints = getConstraintsForCell(r,
            c, parent, cols);
        constraints.setX(x);
        constraints.setWidth(width);
      }
      x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
    }

    //Align all cells in each row and make them the same height.
    Spring y = Spring.constant(initialY);
    for (int r = 0; r < rows; r++) {
      Spring height = Spring.constant(0);
      for (int c = 0; c < cols; c++) {
        height = Spring.max(height, getConstraintsForCell(r, c, parent,
            cols).getHeight());
      }
      for (int c = 0; c < cols; c++) {
        SpringLayout.Constraints constraints = getConstraintsForCell(r,
            c, parent, cols);
        constraints.setY(y);
        constraints.setHeight(height);
      }
      y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
    }

    //Set the parent's size.
    SpringLayout.Constraints pCons = layout.getConstraints(parent);
    pCons.setConstraint(SpringLayout.SOUTH, y);
    pCons.setConstraint(SpringLayout.EAST, x);
  }
}
           
         
    
    
    
    
    
  














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