Spring Form
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/*
* 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
6, 6, //initX, initY
6, 6); //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 = (SpringLayout) parent.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 = (SpringLayout) parent.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 = (SpringLayout) parent.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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