MixerModel and sliders for rendering volume values
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// MixerTest2.java
//A test of the MixerModel and sliders for rendering volume values.
//This version also includes adjustable sliders for editing the
//volume values.
//
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.EventObject;
import java.util.Vector;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.JTable;
import javax.swing.JWindow;
import javax.swing.SwingConstants;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
public class MixerTest2 extends JFrame {
public MixerTest2() {
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());
jt.setDefaultEditor(Volume.class, new VolumeEditor());
JScrollPane jsp = new JScrollPane(jt);
getContentPane().add(jsp, BorderLayout.CENTER);
}
public static void main(String args[]) {
MixerTest2 mt = new MixerTest2();
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;
}
}
//VolumeEditor.java
//A slider Editor for volume values in a table.
//
class VolumeEditor extends JSlider implements TableCellEditor {
public OkCancel helper = new OkCancel();
protected transient Vector listeners;
protected transient int originalValue;
protected transient boolean editing;
public VolumeEditor() {
super(SwingConstants.HORIZONTAL);
listeners = new Vector();
}
// Inner class for the ok/cancel popup window that displays below the
// active scrollbar. It's position will have to be determined by the
// editor when getTableCellEditorComponent() is called.
public class OkCancel extends JWindow {
private JButton okB = new JButton(new ImageIcon("accept.gif"));
private JButton cancelB = new JButton(new ImageIcon("decline.gif"));
private int w = 50;
private int h = 24;
public OkCancel() {
setSize(w, h);
setBackground(Color.yellow);
JPanel p = new JPanel(new GridLayout(0, 2));
//p.setBorder(BorderFactory.createLineBorder(Color.gray));
//okB.setBorder(null);
//cancelB.setBorder(null);
p.add(okB);
p.add(cancelB);
setContentPane(p);
okB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
stopCellEditing();
}
});
cancelB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
cancelCellEditing();
}
});
}
}
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
if (value == null) {
return this;
}
if (value instanceof Volume) {
setValue(((Volume) value).getVolume());
} else {
setValue(0);
}
table.setRowSelectionInterval(row, row);
table.setColumnSelectionInterval(column, column);
originalValue = getValue();
editing = true;
Point p = table.getLocationOnScreen();
Rectangle r = table.getCellRect(row, column, true);
helper
.setLocation(r.x + p.x + getWidth() - 50, r.y + p.y
+ getHeight());
helper.setVisible(true);
return this;
}
// CellEditor methods
public void cancelCellEditing() {
fireEditingCanceled();
editing = false;
helper.setVisible(false);
}
public Object getCellEditorValue() {
return new Integer(getValue());
}
public boolean isCellEditable(EventObject eo) {
return true;
}
public boolean shouldSelectCell(EventObject eo) {
return true;
}
public boolean stopCellEditing() {
fireEditingStopped();
editing = false;
helper.setVisible(false);
return true;
}
public void addCellEditorListener(CellEditorListener cel) {
listeners.addElement(cel);
}
public void removeCellEditorListener(CellEditorListener cel) {
listeners.removeElement(cel);
}
protected void fireEditingCanceled() {
setValue(originalValue);
ChangeEvent ce = new ChangeEvent(this);
for (int i = listeners.size() - 1; i >= 0; i--) {
((CellEditorListener) listeners.elementAt(i)).editingCanceled(ce);
}
}
protected void fireEditingStopped() {
ChangeEvent ce = new ChangeEvent(this);
for (int i = listeners.size() - 1; i >= 0; i--) {
((CellEditorListener) listeners.elementAt(i)).editingStopped(ce);
}
}
}
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