I have been lurking around here for a couple years or so, never needed to ask a question before because I have always found my answer in someone else's question. Thank you!
I guess the lurking has come to an end. I have seen similar questions but not exactly this situation on here:
I have a 2 column JTable with a JComboBox in the first column, and an integer in the second column.
JComboBox has ItemListener set up so that when the selection in the JComboBox is changed the value in the Integer column is set to the comboBox selected index. Right click on the table renders JPopupMenu with addRow() as MouseEvent.
It works fine as long as I add all the rows I want when setting up the DefaultTableModel. But, if I start the model with only one row and use the MouseEvent (or any other method of adding rows other than adding them in parameters of DefaultTableModel) to add rows, when we start changing the selections in the combo boxes it will change the integer values in other rows.
For example: If i run the program and immediately add two more rows via MouseEvent, I then select Zero from combo in row 0, One from combo in row 1, and Two from combo in row 2. All fine so far...
Then I go back to row 0 and as soon as I activate the combobox (I haven't selected an item yet...) it changes the integer in row 2 to 0.
Can anyone tell me how to stop the integers from changing in this manner?
here is a trial code:
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumnModel;
public class JComboBoxInJTable {
public static void main(String[] args) {
new JComboBoxInJTable();
}
public JComboBoxInJTable() {
EventQueue.invokeLater(() -> {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"ComboBox", "Index"}, 1);
JTable table = new JTable(model);
//popup menu to add row
JPopupMenu popup = new JPopupMenu();
JMenuItem newRow;
newRow = new JMenuItem("New Row");
newRow.setToolTipText("Add new row.");
newRow.addActionListener((ActionEvent nr) -> {
model.addRow(new Object[]{"", ""});
});
popup.add(newRow);
//set up right-click to open popup menu
table.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent rc) {
if (SwingUtilities.isRightMouseButton(rc)) {
if (table.getSelectedRow() >= 0) {
popup.show(table, rc.getX(), rc.getY());
}
}
}
});
JComboBox combo = new JComboBox(new Object[]{"Zero", "One", "Two", "Three"});
combo.addItemListener((ItemEvent e) -> {
if (e.getStateChange() == ItemEvent.SELECTED) {
//sets value of cell to left of combobox to comboboxe's selected index
table.setValueAt(combo.getSelectedIndex(), table.getSelectedRow(), 1);
} else {
//do nothing...
}
});
DefaultCellEditor comboEditor = new DefaultCellEditor(combo);
TableColumnModel tcm = table.getColumnModel();
tcm.getColumn(0).setCellEditor(comboEditor);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
});
}
}
As usual I am sure this is something simple that I am missing. Thanks Again for the help in the past and in the future!
Don't use MouseListeners to show popup menus, different OSs have different triggers for the popups, and not all are triggered by mousePressed. Instead use JComponent#setComponentPopupMenu and let the API deal with it
Don't modify the state of the model from an editor. This can place the model into an invalidate state and cause other side effects, like you have now. Once seems to be happening is when a new row is selected, the editor is been updated with the rows cell value, but the row selection hasn't been set, so the table still thinks the previous row is still selected. Instead, use the models setValueAt method to make decisions about what to do once the first columns value is changed.
For example...
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumnModel;
public class JComboBoxInJTable {
public static void main(String[] args) {
new JComboBoxInJTable();
}
private List<String> comboData;
public JComboBoxInJTable() {
EventQueue.invokeLater(() -> {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"ComboBox", "Index"}, 1) {
#Override
public void setValueAt(Object aValue, int row, int column) {
super.setValueAt(aValue, row, column);
if (column == 0) {
String value = aValue == null ? null : aValue.toString();
if (aValue == null) {
super.setValueAt(null, row, 1);
} else {
super.setValueAt(comboData.indexOf(aValue), row, 1);
}
}
}
};
JTable table = new JTable(model);
table.setFillsViewportHeight(true);
table.setGridColor(Color.GRAY);
//popup menu to add row
JPopupMenu popup = new JPopupMenu();
JMenuItem newRow;
newRow = new JMenuItem("New Row");
newRow.setToolTipText("Add new row.");
newRow.addActionListener((ActionEvent nr) -> {
model.addRow(new Object[]{"", ""});
});
popup.add(newRow);
table.setComponentPopupMenu(popup);
comboData = new ArrayList<>(Arrays.asList(new String[]{"Zero", "One", "Two", "Three"}));
JComboBox combo = new JComboBox(comboData.toArray(new String[comboData.size()]));
// combo.addItemListener((ItemEvent e) -> {
// if (e.getStateChange() == ItemEvent.SELECTED) {
// //sets value of cell to left of combobox to comboboxe's selected index
// System.out.println("Selected row = " + table.getSelectedRow());
// table.setValueAt(combo.getSelectedIndex(), table.getSelectedRow(), 1);
// } else {
// //do nothing...
// }
// });
DefaultCellEditor comboEditor = new DefaultCellEditor(combo);
TableColumnModel tcm = table.getColumnModel();
tcm.getColumn(0).setCellEditor(comboEditor);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
});
}
}
Related
I'm trying To insert a JTable into a JScrollPane and I see a small gap between the borders of the table and the scroll Pane.And on the left side the table looks to be aligned to extreme left.Can someone please help me fix this.?
Removing setAutoResizeMode(JTable.AUTO_RESIZE_OFF) is fixing that.But I Need to turn that off.
this.dataTable = new SortableTable(this);
this.dataTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
this.dataTable.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
scrollPane = new JScrollPane(dataTable,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setPreferredSize(new Dimension(900,250));
scrollPane.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
You simply need to set the resize mode in a listener, when the component is resized. Here is an example:
import java.awt.Window;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.table.TableColumn;
public class TableTest implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new TableTest());
}
#Override
public void run() {
JTable table = new JTable(10, 3);
final JScrollPane scroller = new JScrollPane(table);
// update the resize mode when scroller is resized and window is shown
scroller.addComponentListener(new ComponentAdapter() {
#Override
public void componentResized(ComponentEvent e) {
Window win = SwingUtilities.windowForComponent(scroller);
if (win != null && win.isVisible()) {
updateColumns(table);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
}
}
});
JFrame frm = new JFrame("Table");
frm.add(scroller);
frm.setSize(600, 400);
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
// Transfer column widths from autoresize mode
private void updateColumns(JTable table) {
for (int i = 0; i < table.getColumnCount(); i++) {
TableColumn col = table.getColumnModel().getColumn(i);
col.setPreferredWidth(col.getWidth());
}
}
}
I use a JTable with two buttons(Active & Inactive Buttons) . When I click on the Inactive button I hide the first column of the table. Also I try to show the first column when I click on the Active button. But the problem is , when I click on the Active button I couldn't display the first column with its preferred size .
This is the code for hide the first column,
expTable.getColumnModel().getColumn(0).setMinWidth(0);
expTable.getColumnModel().getColumn(0).setMaxWidth(0);
expTable.getColumnModel().getColumn(0).setWidth(0);
This is the code for get back fist column,
expTable.getColumnModel().getColumn(0).setMinWidth(0);
expTable.getColumnModel().getColumn(0).setMaxWidth(300);
expTable.getColumnModel().getColumn(0).setWidth(100);
First I click on the Inactive button and then I click on the Active button . But this is not working .
Have any idea to how to do above .
private void inactiveButtonActionPerformed(java.awt.event.ActionEvent evt){
expTable.getColumnModel().getColumn(0).setMinWidth(0);
expTable.getColumnModel().getColumn(0).setMaxWidth(0);
expTable.getColumnModel().getColumn(0).setWidth(0);
}
private void activeButtonActionPerformed(java.awt.event.ActionEvent evt)
{
expTable.getColumnModel().getColumn(0).setMinWidth(0);
expTable.getColumnModel().getColumn(0).setMaxWidth(300);
expTable.getColumnModel().getColumn(0).setWidth(100);
}
Don't attempt to "hide" a TableColumn by playing with the width. The TableColumn is still part of the table so when the user tabs from column to column, focus will go to the hidden column and disappear from the users view which is very confusing.
Instead you should remove the TableColumn from the TableColumnModel. Then you can add the TableColumn back to the TableColumnModel when needed.
Check out the Table Column Manager which manages this concept for you. If you don't use the full functionality of the class you can use the hideColumn(...) and showColumn(...) to do a simple toggle on the first column.
In the past when I've need to do something like, I've simply removed and re-added the TableColumn
This is a pretty crude example of the concept...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JToggleButton;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
DefaultTableModel model = new DefaultTableModel();
model.addColumn("Column 1");
model.addColumn("Column 2");
model.addColumn("Column 3");
model.addColumn("Column 4");
model.setRowCount(100);
JTable table = new JTable(model);
add(new JScrollPane(table));
JToggleButton toggle = new JToggleButton("Toggle");
toggle.addActionListener(new ActionListener() {
private TableColumn column;
#Override
public void actionPerformed(ActionEvent e) {
TableColumnModel columnModel = table.getColumnModel();
if (toggle.isSelected()) {
column = columnModel.getColumn(0);
table.getColumnModel().removeColumn(column);
} else if (column != null) {
columnModel.addColumn(column);
columnModel.moveColumn(columnModel.getColumnCount() - 1, 0);
}
}
});
add(toggle, BorderLayout.SOUTH);
}
}
}
I actually spent sometime putting together a custom TableModel which provide the ability to hide and show columns, which basically wrapped this functionality up in a nice reusable package
I have a JTable object and i would add 5 different JComboBox on a single column.
I've so tried:
table.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(jcombo));
but this add the same JComboBox to all cells of that column. How can i do to add different ones on the same column?
Thank you!
Basically, you need to modify the model which the combobox is using depending on the row.
The following example allows you to specify a ComboBoxModel for a given row and provide a default ComboBoxModel to be used when one is not specified for the row.
Generally speaking though, each column should be of the same type...
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.HashMap;
import java.util.Map;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
public class TestCombo {
public static void main(String[] args) {
new TestCombo();
}
public TestCombo() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"Stuff"}, 5);
JTable table = new JTable(model);
table.setGridColor(Color.LIGHT_GRAY);
MyComboBoxCellEditor editor = new MyComboBoxCellEditor();
editor.setModelForRow(0, new DefaultComboBoxModel(new Object[]{"Banana", "Peach", "Pear"}));
editor.setModelForRow(1, new DefaultComboBoxModel(new Object[]{"Dog", "Cat", "T-Rex"}));
editor.setModelForRow(2, new DefaultComboBoxModel(new Object[]{"Car", "Truck", "Hovercraft"}));
editor.setModelForRow(3, new DefaultComboBoxModel(new Object[]{"Helicopter", "Plane", "Rocket"}));
editor.setModelForRow(4, new DefaultComboBoxModel(new Object[]{"PC", "Mac", "Linux"}));
table.getColumnModel().getColumn(0).setCellEditor(editor);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MyComboBoxCellEditor extends DefaultCellEditor {
private ComboBoxModel defaultModel;
private Map<Integer, ComboBoxModel> mapModels;
public MyComboBoxCellEditor() {
super(new JComboBox());
mapModels = new HashMap<>(25);
defaultModel = new DefaultComboBoxModel();
}
public void setDefaultModel(ComboBoxModel model) {
defaultModel = model;
}
public void setModelForRow(int row, ComboBoxModel model) {
mapModels.put(row, model);
}
public ComboBoxModel getDefaultModel() {
return defaultModel;
}
public ComboBoxModel getModelForRow(int row) {
return mapModels.get(row);
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
JComboBox comboBox = (JComboBox) getComponent();
ComboBoxModel model = getModelForRow(row);
if (model == null) {
model = getDefaultModel();
}
comboBox.setModel(model);
return super.getTableCellEditorComponent(table, value, isSelected, row, column); //To change body of generated methods, choose Tools | Templates.
}
}
}
I have a Jtable in which I want to add a JCheckbox in one column. However, when I create a JCheckbox object, javax.swing.JCheckBox is being displayed in the column.Please refer to the image. Can you tell me how to amend that please? I have searched everywhere but cannot seem to find any solution for it. Thank you.
don't add components to your TableModel, that's not the responsibility of the TableModel
You will need to specify the class type of your column. Assuming you're using a DefaultTableModel, you can simply fill the column with a bunch of booleans and this should work - After testing, you will need to override the getColumnClass method of the DefaultTableModel (or what ever TableModel implementation) and make sure that for the "check box" column, it returns Boolean.class
See How to use tables for more details
For example...
import java.awt.EventQueue;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
public class TestCardLayout {
public static void main(String[] args) {
new TestCardLayout();
}
public TestCardLayout() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
Random rnd = new Random();
DefaultTableModel model = new DefaultTableModel(new Object[]{"Check boxes"}, 0) {
#Override
public Class<?> getColumnClass(int columnIndex) {
return Boolean.class;
}
};
for (int index = 0; index < 10; index++) {
model.addRow(new Object[]{rnd.nextBoolean()});
}
JTable table = new JTable(model);
final JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
I saw the BallonTip at java.net and I tried to integrate it into my application to be displayed when a user clicks a table cell. When a table cell is clicked, the BalloonTip is showing up as intended, but when you scroll it out of the current viewport, you can click another cell without the BalloonTip showing up. When you scroll the table, the BallonTip is shown again.
Here is an example:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import net.java.balloontip.BalloonTip;
import net.java.balloontip.TablecellBalloonTip;
import net.java.balloontip.styles.EdgedBalloonStyle;
public class TableTest2 extends JFrame {
static final int LENGTH = 40;
TablecellBalloonTip tip;
JTable mainTable;
JPanel main;
JLayeredPane layeredPane;
JScrollPane mainScroll;
TableTest2() {
mainTable = new JTable(LENGTH, LENGTH);
CustomListSelectionListener clsl = new CustomListSelectionListener(mainTable);
mainTable.getColumnModel().getSelectionModel().addListSelectionListener(clsl);
mainTable.getSelectionModel().addListSelectionListener(clsl);
mainTable.setTableHeader(null);
mainTable.setColumnSelectionAllowed(true);
mainScroll = new JScrollPane(mainTable);
add(mainScroll);
tip = new TablecellBalloonTip(mainTable, new JLabel("Hello World!"), -1, -1, new EdgedBalloonStyle(Color.WHITE,
Color.BLUE), BalloonTip.Orientation.LEFT_ABOVE, BalloonTip.AttachLocation.ALIGNED, 5, 5, false);
setPreferredSize(new Dimension(500, 400));
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
}
public static void main(String[] args) {
new TableTest2();
}
protected class CustomListSelectionListener implements ListSelectionListener {
private int row, column, lead, anchor;
private JTable table;
public CustomListSelectionListener(JTable table) {
this.table = table;
}
#Override
public void valueChanged(ListSelectionEvent evt) {
if (evt.getSource() == table.getSelectionModel() && table.getRowSelectionAllowed()) {
// row selection changed
row = table.getSelectedRow();
column = table.getSelectedColumn();
tip.setCellPosition(row, column);
tip.refreshLocation();
} else if (evt.getSource() == table.getColumnModel().getSelectionModel()
&& table.getColumnSelectionAllowed()) {
// column selection changed
lead = table.getColumnModel().getSelectionModel().getLeadSelectionIndex();
anchor = table.getColumnModel().getSelectionModel().getAnchorSelectionIndex();
if (lead <= anchor) {
column = anchor;
} else {
column = lead;
}
row = table.getSelectedRow();
tip.setCellPosition(row, column);
tip.refreshLocation();
}
}
}
}
How can I force the BalloonTip to be shown after I click a cell in the table? I think there is a listener, which is listening for the scrolling event and manages the painting of the BallonTip, but I do not have a clue which one it is.
best regards
htz
According to this mailing list, there was a bug in the BallonTip version 1.2.1. Now, with version 1.2.3, this is fixed.