A slider renderer for volume values in a table
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// MixerTest.java
//A test application for showing Volume data in a JTable using the
//custom VolumneRenderer class.
//
import java.awt.BorderLayout;
import java.awt.Component;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
public class MixerTest extends JFrame {
public MixerTest() {
super("Customer Editor Test");
setSize(600, 160);
setDefaultCloseOperation(EXIT_ON_CLOSE);
MixerModel test = new MixerModel();
test.dump();
JTable jt = new JTable(test);
jt.setDefaultRenderer(Volume.class, new VolumeRenderer());
JScrollPane jsp = new JScrollPane(jt);
getContentPane().add(jsp, BorderLayout.CENTER);
}
public static void main(String args[]) {
MixerTest mt = new MixerTest();
mt.setVisible(true);
}
}
//MixerModel.java
//An audio mixer table data model. This model contains the following columns:
//<br> + Track name (String)
//<br> + Track start time (String)
//<br> + Track stop time (String)
//<br> + Left channel volume (Volume, 0 . . 100)
//<br> + Right channel volume (Volume, 0 . . 100)
//
class MixerModel extends AbstractTableModel {
String headers[] = { "Track", "Start", "Stop", "Left Volume",
"Right Volume" };
Class columnClasses[] = { String.class, String.class, String.class,
Volume.class, Volume.class };
Object data[][] = {
{ "Bass", "0:00:000", "1:00:000", new Volume(56), new Volume(56) },
{ "Strings", "0:00:000", "0:52:010", new Volume(72), new Volume(52) },
{ "Brass", "0:08:000", "1:00:000", new Volume(99), new Volume(0) },
{ "Wind", "0:08:000", "1:00:000", new Volume(0), new Volume(99) }, };
public int getRowCount() {
return data.length;
}
public int getColumnCount() {
return headers.length;
}
public Class getColumnClass(int c) {
return columnClasses[c];
}
public String getColumnName(int c) {
return headers[c];
}
public boolean isCellEditable(int r, int c) {
return true;
}
public Object getValueAt(int r, int c) {
return data[r][c];
}
// Ok, do something extra here so that if we get a String object back (from
// a
// text field editor) we can still store that as a valid Volume object. If
// it's just a string, then stick it directly into our data array.
public void setValueAt(Object value, int r, int c) {
if (c >= 3) {
((Volume) data[r][c]).setVolume(value);
} else {
data[r][c] = value;
}
}
// A quick debugging utility to dump out the contents of our data structure
public void dump() {
for (int i = 0; i < data.length; i++) {
System.out.print("|");
for (int j = 0; j < data[0].length; j++) {
System.out.print(data[i][j] + "|");
}
System.out.println();
}
}
}
//Volume.java
//A simple data structure for track volumes on a mixer.
//
class Volume {
private int volume;
public Volume(int v) {
setVolume(v);
}
public Volume() {
this(50);
}
public void setVolume(int v) {
volume = (v < 0 ? 0 : v > 100 ? 100 : v);
}
public void setVolume(Object v) {
if (v instanceof String) {
setVolume(Integer.parseInt((String) v));
} else if (v instanceof Number) {
setVolume(((Number) v).intValue());
} else if (v instanceof Volume) {
setVolume(((Volume) v).getVolume());
}
}
public int getVolume() {
return volume;
}
public String toString() {
return String.valueOf(volume);
}
}
//VolumeRenderer.java
//A slider renderer for volume values in a table.
//
class VolumeRenderer extends JSlider implements TableCellRenderer {
public VolumeRenderer() {
super(SwingConstants.HORIZONTAL);
// set a starting size...some 1.2/1.3 systems need this
setSize(115, 15);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (value == null) {
return this;
}
if (value instanceof Volume) {
setValue(((Volume) value).getVolume());
} else {
setValue(0);
}
return this;
}
}
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