I have a table where you can select specific cells.
When you select row 1 and 2 for first column by using Ctrl-click, and then you remove selection on one of the rows, the other row also get de-selected:
public static void main(String[] args)
{
JFrame jf = new JFrame("Test");
JTable table = new JTable();
table.setCellSelectionEnabled(true);
DefaultTableModel tm = new DefaultTableModel(new Object[][]{new Object[]{1,"A"},new Object[]{2, "B"},new Object[]{3, "C"}}, new Object[]{"Test", "Test2"});
table.setModel(tm);
jf.setSize(300, 400);
jf.getContentPane().add(table);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jf.setLocationRelativeTo(null);
jf.setVisible(true);
}
Ctrl + Click on Test/2:
I expected:
From what i understand of the Swing code, the problem is that the column selection model has a code that does something like: if col = 0 selected, remove selection altogether. So when the table re-rendered, there's no column selection and whole selection gets cleared.
Is there a way to prevent whole deselection without recoding the whole DefaultSelectionModel?
I solved it by keeping track of the last selected column and having a selection listener that checks if selected row count is > 0, then select the lastly selected column, not perfect mayhaps but it seems to work fine
Related
I was trying to write the GUI for my program. I have a Product class in which I store price and names of the products in an arraylist. I also have an Order arraylist which consists of the orders given to each waiter.I put all my products in a JComboBox and added an action listener to each to show the price of each product when clicked by updating the text of a JLable. Then there is a JSpinner to get the quantity of the products selected. And lastly there is an "Add" button that I wanted to use to update the Jtable with product name and its quantity and its total price while also adding that product to the arraylist of Orders. I have no idea how populate JTable and couldn't understand much from other answers because they were using netbeans. I thought of just using a simple JLabe but also I couldn't understand how to update the text and add a new line to the label after I select and add each product. Can you explain how I can achieve this? part of my code looks like this
box1.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
Product prod = (Product) box1.getSelectedItem();
price.setText(String.valueOf(prod.getSellingPrice()));
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
int numbs = (Integer) spinner.getValue();
for (int i = 0; i <= numbs; i++) {
order.addProduct(prod);
}
JLabel label = new JLabel();
lists.add(label);
label.setText(prod.getName() + " " + numbs + " " + numbs * prod.getSellingPrice());
}
});
}
});
If I understand your question correctly, you want a JTable in your gui, which shows the orders (or other data possibly) if a button is clicked.
Firstable, I would advise you to check out
https://docs.oracle.com/javase/tutorial/uiswing/components/table.html
as they explain the use of the JTable very well.
Anyway, to answer your question:
Firstable, you have to create a table and add it to your gui:
//creating a new JTable without any data and one column 'Orders'
//you might wanna declare the JTable before that, since it will be referred to in the refresh() method
JTable table = new JTable(new String[][]{{""}}, new String[]{"Orders"});
//creating a scrollpane to put the table in, in case the table data exeeds the table
JScrollPane scrollPane = new JScrollPane();
//here you would e.g. set the bounds of the scrollpane etc
scrollPane.setBounds(x,y,w,h)
//setting the table in the scrollpane
scrollPane.setViewportView(table);
//adding the scrollpane to your contentPane
contentPane.add(scrollPane);
Now you want to refresh the table, if a button is pressed, so I would put a reference to the following method in the actionlistener of the button:
//the method to refresh the table containing the orders (or possibly other data)
void refresh(List<String> orders) {
//creating a new TableModel for the table
DefaultTableModel model = new DefaultTableModel();
//set the data in the model to the data that was given, new Object[]{0} points to the 1st column
model.setDataVector(getDataVector(data), new Object[]{"Orders});
//set the model of the table to the model we just created
table.setModel(model);
}
Since model.setDataVecor() takes rows and not columns as its first parameter, you have to make the list of data fitting as a data vector, for example with the following method:
Object[][] getDataVector(List<String> data){
Object[][] vector = new Object[data.size()][1];
for(int i=0; i<data.size(); i++){
vector[i][0] = data.get(i);
}
return vector;
}
I am working with swing JTable and have a trouble with repainting table. I draw a JTable with thr following code
Object[] column = new Object[]{"Entity", "Attribute"};
Object[][] rowData = new Object[][]{{"E1", "A1"},{"E2", "A2"}};
TableCellRenderer cellRenderer = new TableCellRenderer();
JTable table = new JTable(new DefaultTableModel(rowData, column));
table.setCellSelectionEnabled(true);
table.getColumnModel().getColumn(0).setCellRenderer(cellRenderer);
Below is my table renderer code ..
public class TableCellRenderer implements javax.swing.table.TableCellRenderer {
//private JPanel panel;
JTextField field;
private JTable table;
#Override
public Component getTableCellRendererComponent(final JTable table, final Object value,
boolean isSelected, boolean hasFocus, final int row, final int column) {
this.table = table;
//JTextField field = null;
System.out.println("Rendere : Row : " + row + "Column : " + column);
final JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
JButton button = new JButton("?");
button.setPreferredSize(new Dimension(20, panel.getHeight()));
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
new SelectionDialog(panel, table, value, row, column);
}
});
if(table.getValueAt(row, column) != null){
field = new JTextField(table.getValueAt(row, column).toString());
}else{
field = new JTextField(table.getValueAt(row, column).toString());
}
field.setPreferredSize(new Dimension(30, panel.getHeight()));
panel.add(field, BorderLayout.WEST);
panel.add(button, BorderLayout.EAST);
return panel;
}
this is how i am updating contents of a cell in table..
SelectionDialog.this.table.getModel().setValueAt("E7", 0, 0);
I am updating the table model data via the SelectionDialog for e.g change data at row 0, colum 0 to E7 etc. After changing data in table model i have tried the following options but none of them has refreshed the table data in view however the data in model of JTable was updated correctly. If I add a new row on the fly and then call the below methods then every thing work fine but if I modify data in the model of an existing row then none of the solution mentioned below is working
//((DefaultTableModel)SelectionDialog.this.table.getModel()).addRow(new Object[]{"E3", "A3"});
//((DefaultTableModel)SelectionDialog.this.table.getModel()).fireTableCellUpdated(SelectionDialog.this.row, SelectionDialog.this.column);
//((DefaultTableModel)SelectionDialog.this.table.getModel()).fireTableChanged(new TableModelEvent(SelectionDialog.this.table.getModel()));
//((DefaultTableModel)SelectionDialog.this.table.getModel()).fireTableStructureChanged();
//SelectionDialog.this.table.repaint();
// SelectionDialog.this.table.revalidate();
Please provide any insights about the problem as I am to swing and may have missed some very prominent things.
Edit 1: Just adding one more note which i wanted to place earlier but don't know how i missed. Table is not updated in general but if i focus out from the cell in which change was made or i change the size of table then it immediately change the contents of that particular cell to fresh selected value.
Problem Solved:
I am placing my findings for someone who is facing similar problem.
I rendered a button and a text box inside each cell in my table. When button was clicked (Editor code is not provided as it looks irrelevant to me to place here) a dialog appear which inputs value from user and update the specific column and row.
The lines i mentioned as not working at the end of my post (before edit 1) were working correctly however renderer was not executing unless i manually focus out from the selected cell (whose button was clicked) or manually change the size of jtable which make sense as button was inside editor and button click shows that cell is edited and off-course renderer will not execute unless editing is finished which requires focus out or enter key etc.
I applied the following code as
table.editCellAt(-1, -1);
It focus out from the edited cell (edited with the button) and hence renderer executes and work as expected.
When you are using a DefaultTableModel and you want to update a certain value, you need to use the DefaultTableModel#setValueAt method.
Calling this method (on the Event Dispatch Thread of course) will update your model and fire the necessary events. Those events will cause your JTable to update itself.
A few additional remarks about your renderer:
Creating new components in each call of your renderer is not the way to go. This becomes incredibly slow for large tables. Create all components once in the constructor of your renderer, and just update their state
Adding a JButton to your table in the renderer has no effect, unless you have an editor as well. The button will not be clickable, and the action listener you attach to it will never be called. See the renderers and editors section in the JTable tutorial for more information.
There should be no need to call getValueAt in your renderer. The value is passed in as one of the arguments
I have a JFrame Form which has JTextFields, JCombobox etc. and I am able to receive those values to variables and now I want to add the received data to JTable in new row when user clicks Add or something like that.
I have created JTable using net-beans the problem is what would be the code to add data from those variable to the rows of table. A basic example would be appreciated. I have tried numerous example and have added the code to ActionListener of the JButton but nothing Happens.
The Examples I tried are. How to add row in JTable? and How to add rows to JTable with AbstractTableModel method?
Any Help would be appreciated.
Peeskillet's lame tutorial for working with JTables in Netbeans GUI Builder
Set the table column headers
Highglight the table in the design view then go to properties pane on the very right. Should be a tab that says "Properties". Make sure to highlight the table and not the scroll pane surrounding it, or the next step wont work
Click on the ... button to the right of the property model. A dialog should appear.
Set rows to 0, set the number of columns you want, and their names.
Add a button to the frame somwhere,. This button will be clicked when the user is ready to submit a row
Right-click on the button and select Events -> Action -> actionPerformed
You should see code like the following auto-generated
private void jButton1ActionPerformed(java.awt.event.ActionEvent) {}
The jTable1 will have a DefaultTableModel. You can add rows to the model with your data
private void jButton1ActionPerformed(java.awt.event.ActionEvent) {
String data1 = something1.getSomething();
String data2 = something2.getSomething();
String data3 = something3.getSomething();
String data4 = something4.getSomething();
Object[] row = { data1, data2, data3, data4 };
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
model.addRow(row);
// clear the entries.
}
So for every set of data like from a couple text fields, a combo box, and a check box, you can gather that data each time the button is pressed and add it as a row to the model.
you can use this code as template please customize it as per your requirement.
DefaultTableModel model = new DefaultTableModel();
List<String> list = new ArrayList<String>();
list.add(textField.getText());
list.add(comboBox.getSelectedItem());
model.addRow(list.toArray());
table.setModel(model);
here DefaultTableModel is used to add rows in JTable,
you can get more info here.
String[] tblHead={"Item Name","Price","Qty","Discount"};
DefaultTableModel dtm=new DefaultTableModel(tblHead,0);
JTable tbl=new JTable(dtm);
String[] item={"A","B","C","D"};
dtm.addRow(item);
Here;this is the solution.
I have added a combobox as a cell editor using the code provided by camickr below as reference:
How to add unique JComboBoxes to a column in a JTable (Java)
Except in my case, I only need one combobox to be used by all of the cells within a column. The problem I'm running into is that the combobox automatically selects the last selected item (or current selected item, not sure), and since different rows share the same combobox, if you click on one of the cells, it'll automatically change to the last selected item.
As a quick demonstration I simply modified the code from above to show the issue. I would like the combo box to automatically select an item on the list equal to the item that is set in selected cell (as opposed to selecting a cell, and then having the contents of that cell automatically change)
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class Test extends JFrame
{
List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);
public Test()
{
// Create the editors to be used for each row
String[] items1 = { "Red", "Blue", "Green" };
JComboBox comboBox1 = new JComboBox( items1 );
DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
editors.add( dce1 );
// Create the table with default data
Object[][] data =
{
{"Color", "Red"},
{"Shape", "Square"},
{"Fruit", "Banana"},
{"Plain", "Text"}
};
String[] columnNames = {"Type","Value"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 1 && row < 3)
return editors.get(0);
else
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
}
public static void main(String[] args)
{
Test frame = new Test();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
}
}
By default the first item of a combo box is selected, which in your example is "Red".
When you edit a cell the value from the TableModel is selected in the comboBox editor. Since the data in your table does not match any of the entries in the comboBox, the selection doesn't change so "Red" is displayed as the value in the editor.
When you make a selection from the editor that value is then saved in the model and will be displayed properly the next time you edit the cell.
The solution to your problem is to make sure the TableModel contains valid data when it is created. Only that way can the proper item in the comboBox be selected.
I figured I would have to attach an action listener to the combobox to determine which item to selected
No, you don't play with listeners on a comboBox when it is used as an editor. The comboBox editor does the selection of the item automatically for you.
I want to print only selected rows in a JTable.
My approach is to make a new TableModel, copy the selected rows there, add the tableModel to a new JTable and then print this new Table.
My Problem: It doesnt work as expected, I just see a black line with the height of the rows, if i select lesser rows the line is smaller) but no content. But the content is in the table model, i can see it when i do system.out...
this is my code:
QueryTableModel tempModel = new QueryTableModel(String[] tableheaders);
JTable tempTable = new JTable();
for(int i : table.getSelectedRows())
tempModel.addRow(((QueryTableModel)table.getModel()).getRowAt(i));
System.out.println(tempModel.getRowCount());
tempTable.setModel(tempModel);
tempTable.print(JTable.PrintMode.FIT_WIDTH, header, null);