Spring Demo 4
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import java.awt.Component;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.Spring;
import javax.swing.SpringLayout;
public class SpringDemo4 {
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("SpringDemo4");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
Container contentPane = frame.getContentPane();
SpringLayout layout = new SpringLayout();
contentPane.setLayout(layout);
//Create and add the components.
JLabel label = new JLabel("Label: ");
JTextField textField = new JTextField("Text field", 15);
contentPane.add(label);
contentPane.add(textField);
//Adjust constraints for the label so it's at (5,5).
SpringLayout.Constraints labelCons = layout.getConstraints(label);
labelCons.setX(Spring.constant(5));
labelCons.setY(Spring.constant(5));
//Adjust constraints for the text field so it's at
//(<label's right edge> + 5, 5).
SpringLayout.Constraints textFieldCons = layout
.getConstraints(textField);
textFieldCons.setX(Spring.sum(Spring.constant(5), labelCons
.getConstraint(SpringLayout.EAST)));
textFieldCons.setY(Spring.constant(5));
//Adjust constraints for the content pane.
setContainerSize(contentPane, 5);
//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();
}
});
}
public static void setContainerSize(Container parent, int pad) {
SpringLayout layout = (SpringLayout) parent.getLayout();
Component[] components = parent.getComponents();
Spring maxHeightSpring = Spring.constant(0);
SpringLayout.Constraints pCons = layout.getConstraints(parent);
//Set the container's right edge to the right edge
//of its rightmost component + padding.
Component rightmost = components[components.length - 1];
SpringLayout.Constraints rCons = layout.getConstraints(rightmost);
pCons.setConstraint(SpringLayout.EAST, Spring.sum(Spring.constant(pad),
rCons.getConstraint(SpringLayout.EAST)));
//Set the container's bottom edge to the bottom edge
//of its tallest component + padding.
for (int i = 0; i < components.length; i++) {
SpringLayout.Constraints cons = layout
.getConstraints(components[i]);
maxHeightSpring = Spring.max(maxHeightSpring, cons
.getConstraint(SpringLayout.SOUTH));
}
pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(
Spring.constant(pad), maxHeightSpring));
}
}
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