Demonstrates a frequent pitfall when specifying a growing row
/*
* Copyright (c) 2002-2004 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
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import javax.swing.*;
import javax.swing.text.JTextComponent;
import com.jgoodies.forms.builder.PanelBuilder;
import com.jgoodies.forms.debug.FormDebugUtils;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.FormLayout;
/**
* Demonstrates a frequent pitfall when specifying a growing row.
* In this layout a row grows, but the text area in that row is centered
* and doesn't 'grow'. In other words, the area doesn't fill
* the available vertical space.
*
* @author Karsten Lentzsch
* @version $Revision: 1.2 $
*/
public class VerticalGrowthExample {
// UI Components **********************************************************
private JTextComponent notesArea;
// Self Launch ************************************************************
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.jgoodies.plaf.plastic.PlasticXPLookAndFeel");
} catch (Exception e) {
// Likely PlasticXP is not in the class path; ignore.
}
JFrame frame = new JFrame();
frame.setTitle("Forms Tutorial :: Vertical Growth");
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
JComponent panel = new VerticalGrowthExample().buildPanel();
frame.getContentPane().add(panel);
frame.setSize(500, 400);
frame.show();
}
// Component Initialization ***********************************************
/**
* Creates and configures the UI components.
*/
private void initComponents() {
notesArea = new JTextArea(
"This text area doesn't consume the available vertical space.\n\n"
+ "The row is specified as 'pref:grow', and so the row grows.\n"
+ "It's just that the text area doesn't fill the row's vertical space.\n\n"
+ "Since the row's alignment is not explicitly defined,\n"
+ "it uses the 'center' alignment as default. But in this case\n"
+ "we want to 'fill'. The row spec should read: 'fill:pref:grow'."
);
}
// Building ***************************************************************
/**
* Builds and returns a panel with a title and scrollable text area.<p>
*
* The FormDebugUtils dumps
*
* @return the built panel
*/
public JComponent buildPanel() {
initComponents();
FormLayout layout = new FormLayout(
"pref:grow",
"pref, 3dlu, pref:grow" // Correct: "pref, 3dlu, fill:pref:grow"
);
PanelBuilder builder = new PanelBuilder(layout);
builder.setDefaultDialogBorder();
CellConstraints cc = new CellConstraints();
builder.addTitle("An Example for FAQ #3.3", cc.xy(1, 1));
builder.add(new JScrollPane(notesArea), cc.xy(1, 3));
FormDebugUtils.dumpRowSpecs(layout);
FormDebugUtils.dumpConstraints(builder.getPanel());
return builder.getPanel();
}
}
forms.zip( 197 k)Related examples in the same category
