I noticed an issue with the setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED) resizes the height content when the scrollbar gets added (due to the content going over the width).
The Code...
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
public class TestGui extends JFrame {
//**************************************************************************************
//************************************* Constructor ************************************
//**************************************************************************************
private TestGui() {
add(createTopScrollPane(), BorderLayout.NORTH);
add(createCenterScrollPane(), BorderLayout.CENTER);
setSize(800,600);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//**************************************************************************************
//*********************************** Support Method ***********************************
//**************************************************************************************
private static GridBagConstraints setGbc(int gridx, int gridy, int gridWidth, int gridHeight, int ipadx, int ipady, String anchorLocation, double weightx, double weighty, Insets insets, boolean fillCell){
GridBagConstraints gbc = new GridBagConstraints();
if (anchorLocation.toUpperCase().equals("NORTHWEST")){
gbc.anchor = GridBagConstraints.NORTHWEST;
} else if (anchorLocation.toUpperCase().equals("NORTH")){
gbc.anchor = GridBagConstraints.NORTH;
} else if (anchorLocation.toUpperCase().equals("NORTHEAST")){
gbc.anchor = GridBagConstraints.NORTHEAST;
} else if (anchorLocation.toUpperCase().equals("WEST")){
gbc.anchor = GridBagConstraints.WEST;
} else if (anchorLocation.toUpperCase().equals("EAST")){
gbc.anchor = GridBagConstraints.EAST;
} else if (anchorLocation.toUpperCase().equals("SOUTHWEST")){
gbc.anchor = GridBagConstraints.SOUTHWEST;
} else if (anchorLocation.toUpperCase().equals("SOUTH")){
gbc.anchor = GridBagConstraints.SOUTH;
} else if (anchorLocation.toUpperCase().equals("SOUTHEAST")){
gbc.anchor = GridBagConstraints.SOUTHEAST;
} else {
gbc.anchor = GridBagConstraints.CENTER;
}
gbc.gridx = gridx; // column
gbc.gridy = gridy; // row
gbc.gridwidth = gridWidth; // number of columns
gbc.gridheight = gridHeight; // number of rows
gbc.ipadx = ipadx; // width of object
gbc.ipady = ipady; // height of object
gbc.weightx = weightx; // shifts columns to side of set anchor
gbc.weighty = weighty; // shifts rows to side of set anchor
gbc.insets = insets; // placement inside cell
if (fillCell){
gbc.fill = GridBagConstraints.BOTH;
}
return gbc;
}
//**************************************************************************************
//************************************ Panel Methods ***********************************
//**************************************************************************************
private JPanel createTopFrame() {
JPanel pnl = new JPanel();
Border lineBorder = BorderFactory.createMatteBorder(0, 0, 0, 5, Color.BLUE);
JLabel lineSplitter = new JLabel();
lineSplitter.setBorder(lineBorder);
pnl.setLayout(new GridBagLayout());
pnl.add(new JLabel("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"),setGbc(0,0, 1,1, 0,0,"CENTER", 0, 0, new Insets(10, 10, 10, 10), false));
pnl.add(new JLabel("XXXXXXXXXXXXXXXXXXXXXXXXXXXXX"),setGbc(0,1, 1,1, 0,0,"CENTER", 0, 0, new Insets(10, 10, 10, 10), false));
pnl.add(lineSplitter, setGbc(1,0,1,2,0,0,"CENTER",0,0,new Insets(0,0,0,0),true));
pnl.add(new JLabel("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"),setGbc(2,0, 1,1, 0,0,"CENTER", 0, 0, new Insets(10, 10, 10, 10), false));
pnl.add(new JLabel("XXXXXXXXXXXXXXXXXXXXXXXXXXXXX"),setGbc(2,1, 1,1, 0,0,"CENTER", 0, 0, new Insets(10, 10, 10, 10), false));
return pnl;
}
private JScrollPane createTopScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
//scrollPane.setPreferredSize(new Dimension(0, 160));
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
scrollPane.setBorder(compoundFinal);
scrollPane.getViewport().setView(createTopFrame());
return scrollPane;
}
private JScrollPane createCenterScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
scrollPane.setBorder(compoundFinal);
return scrollPane;
}
//**************************************************************************************
//************************************ Start Program ***********************************
//**************************************************************************************
public static void main(String[] args) {
new TestGui();
}
}
Note: If I use setPreferredSize, it adds spacing between borders when maximizing the window, and I don't want that.
As you can see, the 2nd row gets cut off, is there anyway to have it not resize (other than setting it to HORIZONTAL_SCROLLBAR_ALWAYS, which still shows the bar if you maximize the window)?
You need to override the methothd getPreferredSize() of your scroll pane. Also you need provide revalidation when component changed.
private TestGui() {
add(createTopScrollPane(), BorderLayout.NORTH);
add(createCenterScrollPane(), BorderLayout.CENTER);
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
revalidate();
repaint();
}
});
}
});
setSize(800,600);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
// another stuff
private JScrollPane createTopScrollPane(){
JScrollPane scrollPane = new JScrollPane() {
@Override
public Dimension getPreferredSize() {
Dimension size = super.getPreferredSize();
if (getHorizontalScrollBar() != null && getHorizontalScrollBar().isVisible()) {
size.height += getHorizontalScrollBar().getHeight();
}
return size;
}
};
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
//scrollPane.setPreferredSize(new Dimension(0, 160));
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
scrollPane.setBorder(compoundFinal);
scrollPane.getViewport().setView(createTopFrame());
return scrollPane;
}