Mega Code Archive

Demonstrates how a JTextAreas 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, * this list of conditions and the following disclaimer. * * o Redistributions in binary form must reproduce the above copyright notice, * 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. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 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; } } } forms.zip( 197 k)