public class GridLayoutFrame extends JFrame implements ActionListener
1: // Fig. 11.43: GridLayoutFrame.java
2: // Demonstrating GridLayout.
3: import java.awt.GridLayout;
4: import java.awt.Container;
5: import java.awt.event.ActionListener;
6: import java.awt.event.ActionEvent;
7: import javax.swing.JFrame;
8: import javax.swing.JButton;
9:
10: public class GridLayoutFrame extends JFrame implements ActionListener
11: {
12: private JButton buttons[]; // array of buttons
13: private final String names[] =
14: { "one", "two", "three", "four", "five", "six" };
15: private boolean toggle = true; // toggle between two layouts
16: private Container container; // frame container
17: private GridLayout gridLayout1; // first gridlayout
18: private GridLayout gridLayout2; // second gridlayout
19:
20: // no-argument constructor
21: public GridLayoutFrame()
22: {
23: super( "GridLayout Demo" );
24: gridLayout1 = new GridLayout( 2, 3, 5, 5 ); // 2 by 3; gaps of 5
25: gridLayout2 = new GridLayout( 3, 2 ); // 3 by 2; no gaps
26: container = getContentPane(); // get content pane
27: setLayout( gridLayout1 ); // set JFrame layout
28: buttons = new JButton[ names.length ]; // create array of JButtons
29:
30: for ( int count = 0; count < names.length; count++ )
31: {
32: buttons[ count ] = new JButton( names[ count ] );
33: buttons[ count ].addActionListener( this ); // register listener
34: add( buttons[ count ] ); // add button to JFrame
35: } // end for
36: } // end GridLayoutFrame constructor
37:
38: // handle button events by toggling between layouts
39: public void actionPerformed( ActionEvent event )
40: {
41: if ( toggle )
42: container.setLayout( gridLayout2 ); // set layout to second
43: else
44: container.setLayout( gridLayout1 ); // set layout to first
45:
46: toggle = !toggle; // set toggle to opposite value
47: container.validate(); // re-layout container
48: } // end method actionPerformed
49: } // end class GridLayoutFrame
50:
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53: * Pearson Education, Inc. All Rights Reserved. *
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