import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import javax.swing.*;
/**
* LayoutTester is a test window that displays rotatable RLabels
* and switches between different rotation-aware layout managers.
*/
public class LayoutTester extends JFrame {
// panel containing the RLabels
JPanel panel;
// poem we use for testing
private static final String POEM[] = {
"Turning and turning
in the widening gyre",
"The falcon cannot
hear the falconer;",
"Things fall apart;",
"the centre cannot hold;",
"Mere anarchy is
loosed upon the world,",
"The blood-dimmed tide
is loosed,",
"and everywhere",
"The ceremony of
innocence is drowned;",
"The best lack
all conviction,",
"while the worst",
"Are full of
passionate intensity.",
};
/**
* Make a LayoutTester.
*/
public LayoutTester() {
super("The Second Coming (by William Butler Yeats)");
setDefaultCloseOperation(EXIT_ON_CLOSE);
// create the UI
Container c = getContentPane();
// make buttons that change the layout of the board
JPanel buttons = new JPanel();
buttons.add(new JButton(new AbstractAction("Circle") {
public void actionPerformed(ActionEvent event) {
panel.setLayout(new CircleLayout());
panel.validate();
}
}));
buttons.add(new JButton(new AbstractAction("Tilt") {
public void actionPerformed(ActionEvent event) {
panel.setLayout(new TiltLayout());
panel.validate();
}
}));
buttons.add(new JButton(new AbstractAction("Add Label") {
public void actionPerformed(ActionEvent event) {
int n = panel.getComponentCount();
if (n < POEM.length) {
System.err.println("adding " + POEM[n]);
panel.add(makePoemLine(n));
panel.validate();
}
}
}));
buttons.add(new JButton(new AbstractAction("Remove Label") {
public void actionPerformed(ActionEvent event) {
int n = panel.getComponentCount();
if (n > 0) {
panel.remove(n-1);
panel.validate();
panel.repaint();
}
}
}));
c.add(buttons, BorderLayout.NORTH);
panel = new JPanel();
panel.setLayout(new CircleLayout());
panel.add(makePoemLine(0));
panel.add(makePoemLine(1));
panel.add(makePoemLine(2));
c.add(panel, BorderLayout.CENTER);
pack();
}
/*
* Make an RLabel containing the ith line of the poem.
*/
private RLabel makePoemLine(int i) {
return new RLabel("" + POEM[i] + "", 0);
}
/**
* Main method. Makes and displays a LayoutTester window.
* @param args Command-line arguments, ignored.
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run () {
new LayoutTester().show();
}
});
}
}