JLabel on top of JTextArea with GridBagLayout shrinks JTextArea's size (Swing / AWT / SWT forum at C

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So, I have a panel with GridBagLayout and I want a Jlabel to be placed on top of JTextArea. The problem is, if I put jlabel on top or bottom of jtextarea, the jtextarea will shrink. I tried to put jbutton instead of jlabel and the jtextarea wasn't shrinking. Here are some illustrations:

with jbutton

with jlabel

Code snippet

import javax.swing.JComponent;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Insets;
import java.awt.Dimension;
public class experiment {
	public static void main(String[]args){
		new experiment();
	experiment(){
		EventQueue.invokeLater(new Runnable(){
		  @Override
		  public void run(){
			JFrame jf = new JFrame("test");
			JPanel pnl_main = new JPanel(new GridBagLayout());
			pnl_main.setPreferredSize(new Dimension(400,400));
			JButton btn1 = new JButton("Sample Button");
			JLabel lbl1 = new JLabel("<html><p><center>Lorem ipsum dolor sit amet, consectetur adipiscing elit."+
									 "Sed aliquam mollis neque, eget imperdiet lorem euismod et Nunc vitae quam ante."+
									 "Nullam gravida sodales quam nec vulputate.",JLabel.CENTER);
			JTextArea jta1 = new JTextArea("Put text here....",10,30);
			jta1.setLineWrap(true);
			jta1.setWrapStyleWord(true);
			jta1.setEditable(false);
			JScrollPane jsp1 = new JScrollPane(jta1);
			jsp1.setPreferredSize(new Dimension(300,200));
			pnl_main.add(lbl1,new GridBagConstraints(0,0,1,1,1,0,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL,
										             new Insets(10,10,10,10),0,0));
			//pnl_main.add(btn1,new GridBagConstraints(0,0,1,1,1,0,GridBagConstraints.CENTER,GridBagConstraints.NONE,
			//							             new Insets(10,10,10,10),0,0));
			pnl_main.add(jsp1,new GridBagConstraints(0,1,1,1,1,0,GridBagConstraints.CENTER,GridBagConstraints.NONE,
										             new Insets(10,10,10,10),0,0));
			jf.add(pnl_main);
			jf.pack();
			jf.setResizable(false);
			jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			jf.setLocationRelativeTo(null);
			jf.setVisible(true);  
}

Is there a solution for this problem? or should I just use other layouts?

Practice 'til your hands twitch.

After playing around with your code I came up with this. It happens to use a "GBC" utility class which I'll add in the next post.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class SwingWithTextArea
implements GBCConsts // e.g. HORIZONTAL
	public static void main( String[] args )
		new SwingWithTextArea();
	SwingWithTextArea()
		EventQueue.invokeLater( new Runnable()
			@Override
			public void run()
				JFrame jf = new JFrame( "test" );
				JPanel pnl_main = new JPanel();
// *** setup layout
				GridBagLayout	mainPanelLayout = new GridBagLayout();
				mainPanelLayout.rowWeights = new double[]{ 0.0, 0.0, 0.0, 0.1, 0.0 };
				mainPanelLayout.rowHeights = new int[]{ 7, 7, 7, 20, 7 };
				mainPanelLayout.columnWeights = new double[]{ 0.0, 1.0, 0.0 };
				mainPanelLayout.columnWidths = new int[]{ 7, 300, 7 };
				pnl_main.setLayout( mainPanelLayout );
				pnl_main.setPreferredSize( new Dimension( 400, 400 ) );
				pnl_main.setMinimumSize( new Dimension( 400, 400 ) );
// *** Fixed HTML
				JLabel lbl1 = new JLabel(
						"<html><p><center>Lorem ipsum dolor sit amet, consectetur adipiscing elit."
								+ "Sed aliquam mollis neque, eget imperdiet lorem euismod et Nunc vitae quam ante."
								+ "Nullam gravida sodales quam nec vulputate.</center></p></html>" );
				JTextArea jta1 = new JTextArea( "Put text here....", 10, 30 );
				jta1.setLineWrap( true );
				jta1.setWrapStyleWord( true );
				jta1.setEditable( false );
				JScrollPane jsp1 = new JScrollPane( jta1 );
				jsp1.setPreferredSize( new Dimension( 300, 200 ) );
				jsp1.setMinimumSize( new Dimension( 300, 200 ) ); // *** set Minimum
				pnl_main.add( lbl1,	new GBC(1,1).setFill( HORIZONTAL ).setAnchor( CENTER ) );
				pnl_main.add( jsp1,	new GBC(1,3).setFill( BOTH ) ); // *** BOTH
				jf.add( pnl_main, BorderLayout.CENTER ); // *** CENTER
				jf.pack();
				jf.setResizable( false );
				jf.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
				jf.setLocationRelativeTo( null );
				jf.setVisible( true );
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<div class="clear"/><div class="postText ">Use of the GBC class will clean up your Swing GridBagConstraint code immensely. The use of "GBCConsts" as an "implements" is strictly for convenience so you can just say "HORIZONTAL" for example.
<br/> <textarea name="code" class="java" cols="60" rows="10">import java.awt.GridBagConstraints;
public interface GBCConsts
	public static int		NONE = GridBagConstraints.NONE;	
	public static int		HORIZONTAL = GridBagConstraints.HORIZONTAL;
	public static int		VERTICAL = GridBagConstraints.VERTICAL;
	public static int		BOTH = GridBagConstraints.BOTH;
	public static int		CENTER = GridBagConstraints.CENTER;
	public static int		NORTH = GridBagConstraints.NORTH;
	public static int		SOUTH = GridBagConstraints.SOUTH;
	public static int		EAST = GridBagConstraints.EAST;
	public static int		WEST = GridBagConstraints.WEST;
	public static int		NORTHEAST = GridBagConstraints.NORTHEAST;
	public static int		NORTHWEST = GridBagConstraints.NORTHWEST;
	public static int		SOUTHEAST = GridBagConstraints.SOUTHEAST;
	public static int		SOUTHWEST = GridBagConstraints.SOUTHWEST;
GBC - A convenience class to tame the GridBagLayout
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
Formerly: package com.horstmann.corejava;
import java.awt.GridBagConstraints;
 * This class simplifies the use of the GridBagConstraints
 * class.
 * All parameters default to zero except for span which
 * defaults to (1,1), and fill which defaults to NONE, and
 * anchor which defaults to CENTER.
public class GBC
extends GridBagConstraints
implements GBCConsts
	private static final long serialVersionUID = 1L;
	 * CSB:
	 * Constructs a GBC with all grid bag constraint values set to
	 * the default.
	public GBC()
		setSpan(1,1);
		setFill(GBCConsts.NONE);
		setAnchor(GBCConsts.CENTER);
	 * Constructs a GBC with a given gridx and gridy position and
	 * all other grid bag constraint values set to the default.
	 * @param gridx
	 *        the gridx position
	 * @param gridy
	 *        the gridy position
	public GBC( int gridx, int gridy )
		this.gridx = gridx;
		this.gridy = gridy;
		setSpan(1,1);
		setFill(GBCConsts.NONE);
		setAnchor(GBCConsts.CENTER);
	 * Constructs a GBC with a given gridx and gridy position and
	 * all other grid bag constraint values set to the default.
	 * @param gridx
	 *        the gridx position
	 * @param gridy
	 *        the gridy position
	public GBC( int gridx, int gridy, int spanx, int spany )
		this.gridx = gridx;
		this.gridy = gridy;
		setSpan(spanx,spany);
		setFill(GBCConsts.NONE);
		setAnchor(GBCConsts.CENTER);
	 * CSB:
	 * Sets a given gridx and gridy position.
	 * @param gridx
	 *        the gridx position
	 * @param gridy
	 *        the gridy position
	public GBC setPosition( int gridx, int gridy )
		this.gridx = gridx;
		this.gridy = gridy;
		return this;
	 * Sets the cell spans.
	 * Constructors set this to default of (1,1)
	 * @param gridwidth
	 *        the cell span in x-direction
	 * @param gridheight
	 *        the cell span in y-direction
	 * @return this object for further modification
	public GBC setSpan( int gridwidth, int gridheight )
		this.gridwidth = gridwidth;
		this.gridheight = gridheight;
		return this;
	 * Sets the anchor.
	 * @param anchor
	 *        the anchor value. CENTER, NORTH, SOUTH, EAST, WEST, NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST 
	 * @return this object for further modification
	public GBC setAnchor( int anchor )
		this.anchor = anchor;
		return this;
	 * Sets the fill direction.
	 * Constructor sets default to NONE
	 * @param fill
	 *        the fill direction. NONE, HORIZONTAL, VERTICAL, BOTH
	 * @return this object for further modification
	public GBC setFill( int fill )
		this.fill = fill;
		return this;
	 * Sets the cell weights.
	 * @param weightx
	 *        the cell weight in x-direction
	 * @param weighty
	 *        the cell weight in y-direction
	 * @return this object for further modification
	public GBC setWeight( double weightx, double weighty )
		this.weightx = weightx;
		this.weighty = weighty;
		return this;
	 * Sets the insets of this cell.
	 * @param distance
	 *        the spacing to use in all directions
	 * @return this object for further modification
	public GBC setInsets( int distance )
		this.insets = new java.awt.Insets( distance, distance, distance,
				distance );
		return this;
	 * Sets the insets of this cell.
	 * @param top
	 *        the spacing to use on top
	 * @param left
	 *        the spacing to use to the left
	 * @param bottom
	 *        the spacing to use on the bottom
	 * @param right
	 *        the spacing to use to the right
	 * @return this object for further modification
	public GBC setInsets( int top, int left, int bottom, int right )
		this.insets = new java.awt.Insets( top, left, bottom, right );
		return this;
	 * Sets the internal padding
	 * @param ipadx
	 *        the internal padding in x-direction
	 * @param ipady
	 *        the internal padding in y-direction
	 * @return this object for further modification
	public GBC setIpad( int ipadx, int ipady )
		this.ipadx = ipadx;
		this.ipady = ipady;
		return this;
	 * Sets the internal padding in the X direction only
	 * @param ipadx
	 *        the internal padding in x-direction
	 * @return this object for further modification
	public GBC setIpadX( int ipadx )
		this.ipadx = ipadx;
		return this;
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<div class="clear"/><div class="postText ">Thanks for this. This is a nice solution. Could you explain to me how this codes work
<br/> 
<br/> mainPanelLayout.rowWeights = new double[]{ 0.0, 0.0, 0.0, 0.1, 0.0 };
<br/> mainPanelLayout.rowHeights = new int[]{ 7, 7, 7, 20, 7 };
<br/> mainPanelLayout.columnWeights = new double[]{ 0.0, 1.0, 0.0 };
<br/> mainPanelLayout.columnWidths = new int[]{ 7, 300, 7 };
<br/> 
<br/> I presume these codes override row and column wildth and height.However, this looks like an advance way to adjust width and height. The javadoc regarding this fields is lacking in details.</div><div class="clinks">
<p>Practice 'til your hands twitch.</p>
				<cite>Elya Matsunomi wrote:</cite>Thanks for this. This is a nice solution. Could you explain to me how this codes work
<br/> 
<br/> mainPanelLayout.rowWeights = new double[]{ 0.0, 0.0, 0.0, 0.1, 0.0 };
<br/> mainPanelLayout.rowHeights = new int[]{ 7, 7, 7, 20, 7 };
<br/> mainPanelLayout.columnWeights = new double[]{ 0.0, 1.0, 0.0 };
<br/> mainPanelLayout.columnWidths = new int[]{ 7, 300, 7 };
<br/> 
<br/> I presume these codes override row and column wildth and height.However, this looks like an advance way to adjust width and height. The javadoc regarding this fields is lacking in details.</p>
		</blockquote>Heights and Widths set up the minimum row and column sizes in pixels. The weights determine that, IF an item will not fit in those dimensions, how to proportionally allocate more space amongst various rows/columns. These provide a more controlled way of maintaining "grid" dimensions than working with height, width, and <u>insets</u> at a cellular level.
<br/> 
<br/> Note that I included "insets", and that in the example code I specifically did NOT include GCB.setInsets(), and that when I created a new GCB(x,y) that my x,y was one-off of yours. All this is because of a little trick with rowHeights and columnWeights of setting some of them to '7' pixels. This size is the number of pixels <u>between</u> rows or columns for spacing, including before the first row/col and after the last row/col. The '7' appears for every other row/col because you have a regular grid. In some layouts it may be necessary for two columns to butt up against each other with no space (for instance), and for that, there would be no '7' inserted. The '7' itself is arbitrary but seems to work nicely. This approach mostly eliminates the need to hand tweak the insets for each cell, though that's still possible.</div><div class="clinks">
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<div class="clear"/><div class="postText ">Note the code order should be:
<br/> 
<br/> <textarea name="code" class="java" cols="60" rows="10">jf.setResizable( false );
jf.pack();
//jf.setResizable( false );

The resizable method can affect the size of the decorations of the frame which in turn will affect the pack() calculation.

I examined the code earlier and found out that I just need to assign weights to my textarea and set the fill mode of textarea's constraints to GridBagConstraints.BOTH to achieve the result that I wanted.

import javax.swing.JComponent;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Insets;
import java.awt.Dimension;
public class experiment {
	public static void main(String[]args){
		new experiment();
	experiment(){
		EventQueue.invokeLater(new Runnable(){
		  @Override
		  public void run(){
			JFrame jf = new JFrame("test");
			JPanel pnl_main = new JPanel(new GridBagLayout());
			pnl_main.setPreferredSize(new Dimension(400,400));
			JLabel lbl1 = new JLabel("<html><p><center>Lorem ipsum dolor sit amet, consectetur adipiscing elit."+
									 "Sed aliquam mollis neque, eget imperdiet lorem euismod et Nunc vitae quam ante."+
									 "Nullam gravida sodales quam nec vulputate.",JLabel.CENTER);
			JTextArea jta1 = new JTextArea("Put text here....");
			jta1.setLineWrap(true);
			jta1.setWrapStyleWord(true);
			jta1.setEditable(false);
			JScrollPane jsp1 = new JScrollPane(jta1);
			jsp1.setPreferredSize(new Dimension(300,200));
			pnl_main.add(lbl1,new GridBagConstraints(0,1,1,1,1,0,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL,
										             new Insets(10,10,10,10),0,0));
			pnl_main.add(jsp1,new GridBagConstraints(0,2,1,1,1,1,GridBagConstraints.CENTER,GridBagConstraints.BOTH,
										             new Insets(10,10,10,10),0,0));
			jf.add(pnl_main);
			jf.setResizable(true);
			jf.pack();
			jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			jf.setLocationRelativeTo(null);
			jf.setVisible(true);  
<p>Practice 'til your hands twitch.</p>
<div class="clear"/><div class="postText ">Very nice.
<br/> 
<br/> Using GBC it would look like:
<br/> <textarea name="code" class="java" cols="60" rows="10">            pnl_main.add( lbl1, new GBC(0,1).setWeight(1,0).setAnchor(CENTER)
            		.setFill(HORIZONTAL).setInsets(10,10,10,10) );
            pnl_main.add( jsp1, new GBC(0,3).setWeight(1,1).setAnchor(CENTER)
            		.setFill(BOTH).setInsets(10,10,10,10) );

Edit: setAnchor(Center) could be removed because it is the default.

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