import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

public class ScrollablePanelDemo extends JPanel

implements ActionListener

{

private JScrollPane scrollPane;

private JSpinner gridColumns;

private JComboBox<ScrollablePanel.ScrollableSizeHint> scrollableHeight;

private JComboBox<ScrollablePanel.ScrollableSizeHint> scrollableWidth;

private JRadioButton verticalUnitPercent;

private JRadioButton verticalUnitPixels;

private JSpinner verticalUnitAmount;

private JRadioButton verticalBlockPercent;

private JRadioButton verticalBlockPixels;

private JSpinner verticalBlockAmount;

private JRadioButton horizontalUnitPercent;

private JRadioButton horizontalUnitPixels;

private JSpinner horizontalUnitAmount;

private JRadioButton horizontalBlockPercent;

private JRadioButton horizontalBlockPixels;

private JSpinner horizontalBlockAmount;

public ScrollablePanelDemo()

{

setBorder( new EmptyBorder(5, 5, 5, 5) );

setLayout( new BorderLayout(5, 5) );

scrollPane = new JScrollPane();

add(scrollPane);

add(createControlPanel(), BorderLayout.EAST);

createLayout();

}

private JPanel createControlPanel()

{

RelativeLayout rl = new RelativeLayout(RelativeLayout.Y_AXIS);

rl.setGap(5);

rl.setAlignment(RelativeLayout.LEADING);

rl.setFill( true );

JPanel panel = new JPanel( rl );

panel.setBorder( new TitledBorder("Configure Panel") );

JPanel r1 = new JPanel( new FlowLayout(FlowLayout.LEFT) );

r1.add( new JLabel("Grid Columns:") );

gridColumns = new JSpinner(new SpinnerNumberModel(3, 1, 40 ,1));

r1.add( gridColumns );

panel.add( r1 );

JPanel r2 = new JPanel( new FlowLayout(FlowLayout.LEFT) );

r2.add( new JLabel("Scrollable Height Hint:") );

scrollableHeight = new JComboBox<>();

scrollableHeight.addItem( ScrollablePanel.ScrollableSizeHint.NONE );

scrollableHeight.addItem( ScrollablePanel.ScrollableSizeHint.FIT );

scrollableHeight.addItem( ScrollablePanel.ScrollableSizeHint.STRETCH );

r2.add( scrollableHeight );

panel.add( r2 );

JPanel r3 = new JPanel( new FlowLayout(FlowLayout.LEFT) );

r3.add( new JLabel("Scrollable Width Hint:") );

scrollableWidth = new JComboBox<>();

scrollableWidth.addItem( ScrollablePanel.ScrollableSizeHint.NONE );

scrollableWidth.addItem( ScrollablePanel.ScrollableSizeHint.FIT );

scrollableWidth.addItem( ScrollablePanel.ScrollableSizeHint.STRETCH );

r3.add( scrollableWidth );

panel.add( r3 );

JPanel r4 = new JPanel( new GridLayout(1, 0, 5, 5) );

r4.setBorder( new TitledBorder("Vertical Unit Increment:") );

verticalUnitPercent = new JRadioButton("Percent");

verticalUnitPercent.setSelected( true );

r4.add( verticalUnitPercent );

verticalUnitPixels = new JRadioButton("Pixels");

r4.add( verticalUnitPixels );

ButtonGroup vuGroup = new ButtonGroup();

vuGroup.add( verticalUnitPercent );

vuGroup.add( verticalUnitPixels );

verticalUnitAmount = new JSpinner(new SpinnerNumberModel(10, 0, 500 ,5));

r4.add( verticalUnitAmount );

panel.add( r4 );

JPanel r5 = new JPanel( new GridLayout(1, 0, 5, 5) );

r5.setBorder( new TitledBorder("Vertical Block Increment:") );

verticalBlockPercent = new JRadioButton("Percent");

verticalBlockPercent.setSelected( true );

r5.add( verticalBlockPercent );

verticalBlockPixels = new JRadioButton("Pixels");

r5.add( verticalBlockPixels );

ButtonGroup vbGroup = new ButtonGroup();

vbGroup.add( verticalBlockPercent );

vbGroup.add( verticalBlockPixels );

verticalBlockAmount = new JSpinner(new SpinnerNumberModel(100, 0, 500 ,5));

r5.add( verticalBlockAmount );

panel.add( r5 );

JPanel r6 = new JPanel( new GridLayout(1, 0, 5, 5) );

r6.setBorder( new TitledBorder("Horizontal Unit Increment:") );

horizontalUnitPercent = new JRadioButton("Percent");

horizontalUnitPercent.setSelected( true );

r6.add( horizontalUnitPercent );

horizontalUnitPixels = new JRadioButton("Pixels");

r6.add( horizontalUnitPixels );

ButtonGroup huGroup = new ButtonGroup();

huGroup.add( horizontalUnitPercent );

huGroup.add( horizontalUnitPixels );

horizontalUnitAmount = new JSpinner(new SpinnerNumberModel(10, 0, 500 ,5));

r6.add( horizontalUnitAmount );

panel.add( r6 );

JPanel r7 = new JPanel( new GridLayout(1, 0, 5, 5) );

r7.setBorder( new TitledBorder("Horizontal Block Increment:") );

horizontalBlockPercent = new JRadioButton("Percent");

horizontalBlockPercent.setSelected( true );

r7.add( horizontalBlockPercent );

horizontalBlockPixels = new JRadioButton("Pixels");

r7.add( horizontalBlockPixels );

ButtonGroup hvGroup = new ButtonGroup();

hvGroup.add( horizontalBlockPercent );

hvGroup.add( horizontalBlockPixels );

horizontalBlockAmount = new JSpinner(new SpinnerNumberModel(100, 0, 500 ,5));

r7.add( horizontalBlockAmount );

panel.add( r7 );

panel.add(Box.createGlue(), Float.valueOf(1));

JButton button = new JButton("Recreate Scrollable Panel");

button.addActionListener( this );

panel.add( button );

return panel;

}

private void createLayout()

{

int columns = (Integer)gridColumns.getValue();

ScrollablePanel panel = new ScrollablePanel( new GridLayout(0, columns) );

panel.setScrollableHeight( (ScrollablePanel.ScrollableSizeHint)scrollableHeight.getSelectedItem() );

panel.setScrollableWidth( (ScrollablePanel.ScrollableSizeHint)scrollableWidth.getSelectedItem() );

ScrollablePanel.IncrementType type;

type = verticalUnitPercent.isSelected() ? ScrollablePanel.IncrementType.PERCENT : ScrollablePanel.IncrementType.PIXELS;

panel.setScrollableUnitIncrement(ScrollablePanel.VERTICAL, type, (Integer)verticalUnitAmount.getValue());

type = verticalBlockPercent.isSelected() ? ScrollablePanel.IncrementType.PERCENT : ScrollablePanel.IncrementType.PIXELS;

panel.setScrollableBlockIncrement(ScrollablePanel.VERTICAL, type, (Integer)verticalBlockAmount.getValue());

type = horizontalUnitPercent.isSelected() ? ScrollablePanel.IncrementType.PERCENT : ScrollablePanel.IncrementType.PIXELS;

panel.setScrollableUnitIncrement(ScrollablePanel.HORIZONTAL, type, (Integer)horizontalUnitAmount.getValue());

type = horizontalBlockPercent.isSelected() ? ScrollablePanel.IncrementType.PERCENT : ScrollablePanel.IncrementType.PIXELS;

panel.setScrollableBlockIncrement(ScrollablePanel.HORIZONTAL, type, (Integer)horizontalBlockAmount.getValue());

createPanel( panel );

}

private void createPanel(JPanel panel)

{

for ( int i = 0; i < 40; i++ )

panel.add( new JButton( "Button" + i ) );

scrollPane.setViewportView(panel);

}

public void actionPerformed(ActionEvent e)

{

createLayout();

}

public static void main(String[] args)

{

SwingUtilities.invokeLater(new Runnable() {

public void run() {

createAndShowGUI();

}

});

}

public static void createAndShowGUI()

{

JFrame frame = new JFrame("Scrollable Panel");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add( new ScrollablePanelDemo() );

frame.setSize(560, 440);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

}