Demonstrates how a JTextArea's preferred size grows with the container
if no columns and rows are set
/*
* Copyright (c) 2002-2004 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
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* o Redistributions in binary form must reproduce the above copyright notice,
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import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.*;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
import com.jgoodies.forms.builder.DefaultFormBuilder;
import com.jgoodies.forms.builder.PanelBuilder;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.FormLayout;
/**
* Demonstrates how a JTextArea's preferred size grows with the container
* if no columns and rows are set.
*
* @author Karsten Lentzsch
* @version $Revision: 1.3 $
*/
public class GrowingTextAreaExample {
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 :: Growing Text Area");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JComponent panel = new GrowingTextAreaExample().buildPanel();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
public JComponent buildPanel() {
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.putClientProperty("jgoodies.noContentBorder", Boolean.TRUE);
String example1Text =
"Here the layout uses a fixed initial size of 200 dlu. "
+ "The area's minimum and preferred sizes will be ignored. "
+ "And so, the area will grow and shrink.";
tabbedPane.add("1",
buildTab("Fixed Size (Good)",
"fill:200dlu:grow",
createArea(example1Text, true, 0, null)));
String example2Text =
"This text area has line wrapping disabled\n"
+ "and uses a hand-wrapped text (using '\\n').\n\n"
+ "Its minimum and preferred sizes are constant and so,\n"
+ "the area will grow but shrink down to its minimum size.";
tabbedPane.add("2",
buildTab("Pref Size, Line Wrap Disabled (Good)",
"fill:pref:grow",
createArea(example2Text, false, 0, null)));
String example3Text =
"This text area grows horizontally and will never shrink again. "
+ "Since line wrapping is enabled, "
+ "the area's preferred size is defined by its size. "
+ "(See BasicTextAreaUI#getPreferredSize(Component).\n\n"
+ "If the layout container grows, the layout manager "
+ "sets a larger size, and hence, the preferred size grows."
+ "The FormLayout honors the area's preferred size to compute "
+ "the new column width, and so the area won't shrink again.\n\n"
+ "Even if you use a 'default' width the column won't shrink.";
tabbedPane.add("3",
buildTab("Pref Size, Line Wrap Enabled (Never Shrinks)",
"fill:pref:grow",
createArea(example3Text, true, 0, null)));
String example4Text =
"This text area grows but never shrinks. "
+ "Since line wrapping is enabled, the area's "
+ "minimum and preferred sizes are defined by its size.\n\n"
+ "If the layout container grows, the layout manager "
+ "sets a larger size, and hence, the minimum and preferred sizes grow. "
+ "If the layout container shrinks, the layout manager can shrink "
+ "the column width down to the area's minimum width. "
+ "But the minimum size is like the preferred size determined "
+ "by the size previously set, and so, the column won't shrink.\n\n"
+ "A solution to this problem is to set a custom minimum size.";
tabbedPane.add("4",
buildTab("Default Size, Line Wrap Enabled (Never Shrinks)",
"fill:default:grow",
createArea(example4Text, true, 0, null)));
String example5Text =
"This text area has uses a column width of 30 characters. "
+ "But that just affects the initial preferred and minimum size."
+ "The area grows and won't shrink again - just as in tabs 3 and 4.";
tabbedPane.add("5",
buildTab("Default Size, Line Wrap Enabled, Columns Set (Never Shrinks)",
"fill:default:grow",
createArea(example5Text, true, 30, null)));
String example6Text =
"This text area grows and shrinks. "
+ "Since line wrapping is enabled, "
+ "the area's preferred size is defined by its size. "
+ "Here a custom minimum size (100, 32) has been set.\n\n"
+ "If the layout container grows, the layout manager "
+ "sets a larger size, and hence, the preferred size grows. "
+ "However, if the layout container shrinks, the layout can "
+ "shrink the column down to the area's minimum width, which is 100; "
+ "the minimum size is independent from the size previously set.";
tabbedPane.add("6",
buildTab("Default Size, Line Wrap Enabled, Min Size Set (Good)",
"fill:default:grow",
createArea(example6Text, true, 0, new Dimension(100, 32))));
return tabbedPane;
}
private JTextArea createArea(
String text,
boolean lineWrap,
int columns,
Dimension minimumSize) {
JTextArea area = new JTextArea(text);
area.setBorder(new CompoundBorder(
new LineBorder(Color.GRAY),
new EmptyBorder(1, 3, 1, 1)));
area.setLineWrap(lineWrap);
area.setWrapStyleWord(true);
area.setColumns(columns);
if (minimumSize != null) {
area.setMinimumSize(new Dimension(100, 32));
}
return area;
}
private JComponent buildTab(String title, String columnSpec, JTextArea area) {
JLabel columnSpecLabel = new JLabel(columnSpec);
columnSpecLabel.setHorizontalAlignment(JLabel.CENTER);
FormLayout layout = new FormLayout(
columnSpec,
"pref, 9dlu, pref, 3dlu, fill:default:grow, 9dlu, pref");
PanelBuilder builder = new PanelBuilder(layout);
builder.setDefaultDialogBorder();
CellConstraints cc = new CellConstraints();
builder.addTitle(title, cc.xy(1, 1));
builder.add(columnSpecLabel, cc.xy(1, 3));
builder.add(area, cc.xy(1, 5));
builder.add(buildInfoPanel(area), cc.xy(1, 7));
return builder.getPanel();
}
private JComponent buildInfoPanel(JTextArea area) {
JLabel sizeLabel = new JLabel();
JLabel minSizeLabel = new JLabel();
JLabel prefSizeLabel = new JLabel();
JLabel lineWrapLabel = new JLabel(area.getLineWrap() ? "enabled" : "disabled");
JLabel customMinLabel = new JLabel(area.isMinimumSizeSet() ? "set" : "computed");
JLabel columnsLabel = new JLabel(area.getColumns() == 0
? "not specified"
: String.valueOf(area.getColumns()));
area.addComponentListener(new SizeChangeHandler(
area, sizeLabel, minSizeLabel, prefSizeLabel));
FormLayout layout = new FormLayout("pref, 4dlu, pref, 21dlu, pref, 4dlu, pref");
DefaultFormBuilder builder = new DefaultFormBuilder(layout);
builder.append("Size:", sizeLabel);
builder.append("Line wrap:", lineWrapLabel);
builder.append("Min size:", minSizeLabel);
builder.append("Min size:", customMinLabel);
builder.append("Pref size:", prefSizeLabel);
builder.append("Columns:", columnsLabel);
return builder.getPanel();
}
// Listens to area size changes and writes the formatted sizes to the given labels.
private static class SizeChangeHandler extends ComponentAdapter {
private final JTextArea area;
private final JLabel sizeLabel;
private final JLabel minSizeLabel;
private final JLabel prefSizeLabel;
private SizeChangeHandler(
JTextArea area,
JLabel sizeLabel,
JLabel minSizeLabel,
JLabel prefSizeLabel) {
this.area = area;
this.sizeLabel = sizeLabel;
this.minSizeLabel = minSizeLabel;
this.prefSizeLabel = prefSizeLabel;
}
public void componentResized(ComponentEvent evt) {
sizeLabel.setText(format(area.getSize()));
minSizeLabel.setText(format(area.getMinimumSize()));
prefSizeLabel.setText(format(area.getPreferredSize()));
}
private String format(Dimension d) {
return String.valueOf(d.width) + ", " + d.height;
}
}
}
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