Demonstrates a frequent pitfall when specifying a growing row : FormLayout实例 « Swing组件 « Java

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Java » Swing组件 » FormLayout实例屏幕截图 
Demonstrates a frequent pitfall when specifying a growing row
Demonstrates a frequent pitfall when specifying a growing row


/*
 * Copyright (c) 2002-2004 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
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 * modification, are permitted provided that the following conditions are met:
 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
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 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
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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(500400);
        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(11));
        builder.add(new JScrollPane(notesArea),     cc.xy(13));
        
        FormDebugUtils.dumpRowSpecs(layout);
        FormDebugUtils.dumpConstraints(builder.getPanel());
        return builder.getPanel();
    }
    
    
 }
           
       
forms.zip( 197 k)
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