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01-28-2008, 03:55 PM
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Member
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Join Date: Jan 2008
Posts: 1
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Need a idea on GridBagLayout
I need idea on GridBagLayout.
When ever I load dialog with below, without values in JList. It is working properly - http://sureshdevi.co.in/test/example1.jpg
While loading dialog with values in JList, Notes JTextArea getting increased. I want to make Notes as a Fixed Size. I tried with setPreferredSize but no use. http://sureshdevi.co.in/test/example2.jpg
private JPanel createPanel() {
JPanel jpMain = new JPanel(new GridBagLayout());
jpMain.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.fill = GridBagConstraints.NONE;
gbc.anchor = GridBagConstraints.NORTHWEST;
JLabel jlLookupText = new JLabel("Lookup text:");
jpMain.add(jlLookupText, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
gbc.gridwidth = 8;
gbc.weightx = 1.0;
gbc.insets = new Insets(0, 5, 0, 5);
gbc.fill = GridBagConstraints.HORIZONTAL;
jtfLookupText = new JTextField();
jtfLookupText.setAlignmentX(Component.CENTER_ALIGNMENT);
jpMain.add(jtfLookupText, gbc);
gbc.gridx = 9;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.insets = new Insets(0, 0, 0, 0);
gbc.fill = GridBagConstraints.NONE;
jbLookup = new JButton("Lookup");
jbLookup.setAlignmentX(Component.CENTER_ALIGNMENT);
jpMain.add(jbLookup, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.insets = new Insets(5, 0, 0, 0);
gbc.fill = GridBagConstraints.NONE;
JLabel jlResults = new JLabel("Results:");
jpMain.add(jlResults, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.gridwidth = 10;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.gridheight = 5;
gbc.insets = new Insets(5, 0, 5, 0);
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
jlLookupResults = new JList(new Vector());
jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jlLookupResults.setCellRenderer(new MatchElementRenderer());
JScrollPane jspCustomPane = new JScrollPane(jlLookupResults, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jpMain.add(jspCustomPane, gbc);
gbc.gridx = 0;
gbc.gridy = 8;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(0, 0, 0, 0);
gbc.anchor = GridBagConstraints.SOUTHWEST;
gbc.fill = GridBagConstraints.NONE;
JLabel jlNotes = new JLabel("Notes:");
jpMain.add(jlNotes, gbc);
gbc.gridx = 0;
gbc.gridy = 9;
gbc.gridwidth = 10;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.gridheight = 3;
gbc.insets = new Insets(5, 0, 5, 0);
gbc.anchor = GridBagConstraints.SOUTHWEST;
gbc.fill = GridBagConstraints.BOTH;
jtaNotes = new JTextArea();
jtaNotes.setEditable(false);
jtaNotes.setFont(jtfLookupText.getFont());
jtaNotes.setBackground(getBackground());
JScrollPane jspNotesPane = new JScrollPane(jtaNotes, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jpMain.add(jspNotesPane, gbc);
gbc.gridx = 8;
gbc.gridy = 13;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(5, 0, 0, 5);
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
jbSelect = new JButton("Select");
jpMain.add(jbSelect, gbc);
gbc.gridx = 9;
gbc.gridy = 13;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(5, 0, 0, 0);
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
jbCancel = new JButton("Cancel");
jpMain.add(jbCancel, gbc);
return jpMain;
}
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01-29-2008, 03:32 AM
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Senior Member
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Join Date: Jul 2007
Posts: 1,222
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import java.awt.*;
import java.util.Vector;
import javax.swing.*;
public class GBLTest {
JList jlLookupResults;
private JTabbedPane getContent() {
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addTab("another approach", tryThis());
tabbedPane.addTab("modified original", createPanel());
return tabbedPane;
}
private JPanel tryThis() {
JPanel panel = new JPanel(new GridBagLayout());
panel.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(0,2,0,2);
gbc.weighty = 1.0;
// row 1
JTextField jtfLookupText = new JTextField();
gbc.weightx = 0;
panel.add(new JLabel("Lookup text:"), gbc);
gbc.weightx = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel.add(jtfLookupText, gbc);
gbc.weightx = 0;
gbc.fill = GridBagConstraints.NONE;
panel.add(new JButton("Lookup"), gbc);
// row 2
gbc.gridy = 1;
gbc.weightx = 1.0;
gbc.gridwidth = 3;
gbc.anchor = GridBagConstraints.WEST;
panel.add(new JLabel("Results:"), gbc);
// row 3
jlLookupResults = new JList(new Vector());
jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// jlLookupResults.setCellRenderer(new MatchElementRenderer());
JScrollPane jspCustomPane = new JScrollPane(jlLookupResults);
gbc.gridy++;
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
panel.add(jspCustomPane, gbc);
// row 4
gbc.gridy++;
gbc.anchor = GridBagConstraints.WEST;
gbc.fill = GridBagConstraints.NONE;
panel.add(new JLabel("Notes:"), gbc);
// row 5
gbc.gridy++;
JTextArea jtaNotes = new JTextArea(3,20);
jtaNotes.setEditable(false);
jtaNotes.setFont(jtfLookupText.getFont());
// jtaNotes.setBackground(getBackground());
JScrollPane jspNotesPane = new JScrollPane(jtaNotes,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel.add(jspNotesPane, gbc);
// row 6
gbc.gridy++;
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
gbc.gridwidth = 2;
panel.add(new JButton("Select"), gbc);
gbc.weightx = 0;
gbc.gridwidth = 1;
panel.add(new JButton("Cancel") , gbc);
return panel;
}
private JPanel createPanel() {
JPanel jpMain = new JPanel(new GridBagLayout());
jpMain.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.fill = GridBagConstraints.NONE;
// Not necessary.
// gbc.anchor = GridBagConstraints.NORTHWEST;
JLabel jlLookupText = new JLabel("Lookup text:");
jpMain.add(jlLookupText, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
// The gridwidth is determined by the row with the maximum
// number of components. For this layout there are three
// columns. So each component in row 1 will have gridwidth = 1.
// gbc.gridwidth = 8;
gbc.weightx = 1.0;
gbc.insets = new Insets(0, 5, 0, 5);
gbc.fill = GridBagConstraints.HORIZONTAL;
JTextField jtfLookupText = new JTextField();
jtfLookupText.setAlignmentX(Component.CENTER_ALIGNMENT);
jpMain.add(jtfLookupText, gbc);
// see note about gridwidth above.
gbc.gridx = 2;
// gbc.gridx = 9;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.insets = new Insets(0, 0, 0, 0);
gbc.fill = GridBagConstraints.NONE;
JButton jbLookup = new JButton("Lookup");
jbLookup.setAlignmentX(Component.CENTER_ALIGNMENT);
jpMain.add(jbLookup, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.insets = new Insets(5, 0, 0, 0);
gbc.fill = GridBagConstraints.NONE;
JLabel jlResults = new JLabel("Results:");
jpMain.add(jlResults, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
// This one component spans across three columns:
gbc.gridwidth = 3;
// gbc.gridwidth = 10;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
// This is for a component spanning multiple rows.
// In this layout each component spans one row so
// the gridheight remains at its default value of one.
// gbc.gridheight = 5;
gbc.insets = new Insets(5, 0, 5, 0);
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
JList jlLookupResults = new JList(new Vector());
jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// jlLookupResults.setCellRenderer(new MatchElementRenderer());
JScrollPane jspCustomPane = new JScrollPane(jlLookupResults,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jpMain.add(jspCustomPane, gbc);
gbc.gridx = 0;
// In a way similiar to the way GridBagLayout determines
// the number of columns (above) it figures the number
// of rows by the column with the most components in it.
// For this layout there are 6 rows.
gbc.gridy = 3;
// gbc.gridy = 8;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(0, 0, 0, 0);
// The anchor constraint needs a non-zero weight value(s).
// gbc.anchor = GridBagConstraints.SOUTHWEST;
gbc.fill = GridBagConstraints.NONE;
JLabel jlNotes = new JLabel("Notes:");
jpMain.add(jlNotes, gbc);
gbc.gridx = 0;
gbc.gridy = 4;
// gbc.gridy = 9;
gbc.gridwidth = 3;
// gbc.gridwidth = 10;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
// Component only spans a single row. So gbc.gridheight is still 1.
// gbc.gridheight = 3;
gbc.insets = new Insets(5, 0, 5, 0);
// Not necessary.
// gbc.anchor = GridBagConstraints.SOUTHWEST;
// Better to give a size hint here to avoid squirrely behavior.
// gbc.fill = GridBagConstraints.BOTH;
gbc.fill = GridBagConstraints.HORIZONTAL;
JTextArea jtaNotes = new JTextArea(3, 20); // size hint
jtaNotes.setEditable(false);
jtaNotes.setFont(jtfLookupText.getFont());
// jtaNotes.setBackground(getBackground());
// AS_NEEDED is the default for both JScrollBars in JScrollPane.
JScrollPane jspNotesPane = new JScrollPane(jtaNotes);//,
// JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
// JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
jpMain.add(jspNotesPane, gbc);
gbc.gridx = 1; // middle column
// gbc.gridx = 8;
gbc.gridy = 5;
// gbc.gridy = 13;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(5, 0, 0, 5);
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
JButton jbSelect = new JButton("Select");
jpMain.add(jbSelect, gbc);
gbc.gridx = 2;
// gbc.gridx = 9;
gbc.gridy = 5;
// gbc.gridy = 13;
gbc.gridwidth = 1;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
gbc.gridheight = 1;
gbc.insets = new Insets(5, 0, 0, 0);
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
JButton jbCancel = new JButton("Cancel");
jpMain.add(jbCancel, gbc);
return jpMain;
}
/**
* Wait 3 seconds and then add data to the list
* in the tryThis/"another approach" tab to see
* if the components change size.
*/
private void addToVector() {
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(3000);
} catch(InterruptedException e) {
System.exit(1);
}
Object[] data = new Object[10];
for(int j = 0; j < data.length; j++)
data[j] = "New data for line " + (j+1);
System.out.println("adding data to list");
jlLookupResults.setListData(data);
}
}).start();
}
public static void main(String[] args) {
GBLTest test = new GBLTest();
JDialog d = new JDialog();
d.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
d.add(test.getContent());
d.setSize(500,400);
d.setLocationRelativeTo(null);
d.setVisible(true);
test.addToVector();
}
}
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