JComboBox with two columns

Hello

I found a nice piece of code in the forum, which extends a JComboBox to display
two columns.
Now I am trying to add my own demands, namely the combo should be editable
and only the first column should appear in the edit field and become the
selected value.

I thought to write an own editor that "catches" the posting process for
manipulate the text that will be displayed. Because the rendering engine uses a
JPanel to display columns, I expect this Panel must be passed in the
setItem method (...) the editor. But it isn't, and I can't even detect
what object is passed.

I wonder if this approach is advisable at all. If comments or ideas
are welcome.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class Main extends JFrame {        
    public static final long serialVersionUID= 70L;

    public Main() {        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        final JComboBox<Object> priceList = new JComboBox<>(new Object[] {
            new Object[] { "Lemon", 0.5 },
            new Object[] { "Cherry", 3 },
            new Object[] { "Apple", 1 },
        });
        priceList.setEditable(true);
     priceList.setEditor(new MyEditor());
        priceList.setRenderer(new MyRenderer());
        add(priceList, BorderLayout.CENTER);

     JButton b= new JButton("OK");
     b.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         System.out.println(priceList.getSelectedItem());
       }
     });
        add(b, BorderLayout.SOUTH);
        pack();
    }
    
    public static void main(String... args) 
    throws Exception {                
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Main().setVisible(true);
            }
        });
    }



  class MyEditor extends JTextField implements ComboBoxEditor {
    public static final long serialVersionUID= 71L;

    public Component getEditorComponent() {
      return this;
    }

    public Object getItem() {
      return getText();
    }

    public void setItem(Object obj) {
      System.out.println("Setting item");
      System.out.println(obj);
      if (obj instanceof JPanel) System.out.println("Panel");
      if (obj instanceof JLabel) System.out.println("Label");
      if (obj instanceof String) System.out.println("String");
      setText("Hello");
    }
  }

 
/** 
 * This class uses panel with two labels to render the list (combobox) cell.
 */
  class MyRenderer extends JPanel implements ListCellRenderer<Object> {
    public static final long serialVersionUID= 72L;
    JLabel labels[] = { new JLabel(), new JLabel() };

    public MyRenderer() {
        setLayout(new GridBagLayout());
        // Add labels
        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.HORIZONTAL;
        c.weightx = 0.1;
        add(labels[0],c);
        add(labels[1]);
    }

    public Component getListCellRendererComponent(JList<?> list, Object value,
               int index, boolean isSelected, boolean cellHasFocus) {
        Object rowData[] = (Object[])value;
        // Prepare colors
        Color foreground = isSelected? 
            list.getSelectionForeground(): list.getForeground();
        Color background = isSelected?
            list.getSelectionBackground(): list.getBackground();
        // Set panel colors
        setForeground(foreground);
        setBackground(background);
        int col = 0;
        for(JLabel label : labels) {
            label.setBackground(background);
            label.setForeground(foreground);
            label.setText( String.valueOf(rowData[col++]) );
        }
        return this;
    }
  }

}

As an alternative, I thought that usiing a JComboBox 'ordinary' with the strings in column 1 as elements and you try to change the popup so that it displays and column 2.

You can render the comboBox and the popup differently. Just check for an index of-1 for the drop-down list box.

Different examples of how you can restore more than one column in a combo box. The example of "text pane" has been changed so that the drop-down list box shows only one column while the popup shows the two columns:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;

public class ComboBoxMultiColumn extends JFrame
{
     public ComboBoxMultiColumn()
     {
          getContentPane().setLayout( new GridLayout(0, 2) );

          Vector items = new Vector();
          items.addElement( new Item("123456789", "Car" ) );
          items.addElement( new Item("23", "Plane" ) );
          items.addElement( new Item("345", "Train" ) );
          items.addElement( new Item("4567", "Nuclear Submarine" ) );

          //  Use a JTextArea as a renderer

          JComboBox comboBox1 = new JComboBox( items );
          comboBox1.setRenderer( new TextAreaRenderer(5) );

          getContentPane().add( new JLabel("TextArea Renderer") );
          getContentPane().add( comboBox1 );

          //  Use a JTextPane as a renderer

          JComboBox comboBox2 = new JComboBox( items );
          comboBox2.setRenderer( new TextPaneRenderer(10) );

          getContentPane().add( new JLabel("TextPane Renderer") );
          getContentPane().add( comboBox2 );

          //  Use a JPanel as a renderer

          JComboBox comboBox3 = new JComboBox( items );
          comboBox3.setRenderer( new PanelRenderer(50) );

          getContentPane().add( new JLabel("Panel Renderer") );
          getContentPane().add( comboBox3 );

          //  Using HTML

          JComboBox comboBox4 = new JComboBox( items );
          comboBox4.setRenderer( new HTMLRenderer() );

          getContentPane().add( new JLabel("HTML Renderer") );
          getContentPane().add( comboBox4 );
     }

     class Item
     {
          private String id;
          private String description;

          public Item(String id, String description)
          {
               this.id = id;
               this.description = description;
          }

          public String getId()
          {
               return id;
          }

          public String getDescription()
          {
               return description;
          }

          public String toString()
          {
               return description;
          }
     }

     public static void main(String[] args)
     {
          JFrame frame = new ComboBoxMultiColumn();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.pack();
          frame.setVisible( true );
     }

     /*
     **  Tabs are easier to use in a JTextArea, but not very flexible
     */
     class TextAreaRenderer extends JTextArea implements ListCellRenderer
     {
          public TextAreaRenderer(int tabSize)
          {
               setTabSize(tabSize);
          }

          public Component getListCellRendererComponent(JList list, Object value,
               int index, boolean isSelected, boolean cellHasFocus)
          {
               Item item = (Item)value;
               setText(item.getId() + "\t" + item.getDescription());
               setBackground(isSelected ? list.getSelectionBackground() : null);
               setForeground(isSelected ? list.getSelectionForeground() : null);
               return this;
          }
     }

     /*
     **  Tabs are harder to use in a JTextPane, but much more flexible
     */
     class TextPaneRenderer extends JTextPane implements ListCellRenderer
     {
          public TextPaneRenderer(int tabColumn)
          {
               setMargin( new Insets(0, 0, 0, 0) );

               FontMetrics fm = getFontMetrics( getFont() );
               int width = fm.charWidth( 'w' ) * tabColumn;

               TabStop[] tabs = new TabStop[1];
               tabs[0] = new TabStop( width, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE );
               TabSet tabSet = new TabSet(tabs);

               SimpleAttributeSet attributes = new SimpleAttributeSet();
               StyleConstants.setTabSet(attributes, tabSet);
               getStyledDocument().setParagraphAttributes(0, 0, attributes, false);
          }

          public Component getListCellRendererComponent(JList list, Object value,
               int index, boolean isSelected, boolean cellHasFocus)
          {
               Item item = (Item)value;

               if (index == -1)
                    setText( item.getDescription() );
               else
                    setText(item.getId() + "\t" + item.getDescription());

               setBackground(isSelected ? list.getSelectionBackground() : null);
               setForeground(isSelected ? list.getSelectionForeground() : null);
               return this;
          }
     }

     /*
     **  Use a panel to hold multiple components
     */
     class PanelRenderer implements ListCellRenderer
     {
          private JPanel renderer;
          private JLabel first;
          private JLabel second;

          public PanelRenderer(int firstColumnWidth)
          {
               renderer = new JPanel();
               renderer.setLayout(new BoxLayout(renderer, BoxLayout.X_AXIS) );

               first = new JLabel(" ");
               Dimension d = first.getPreferredSize();
               d.width = firstColumnWidth;
               first.setMaximumSize(d);
               second = new JLabel();
               renderer.add(first );
               renderer.add(second );
          }

          public Component getListCellRendererComponent(JList list, Object value,
               int index, boolean isSelected, boolean cellHasFocus)
          {
               Item item = (Item)value;

               first.setText( item.getId() );
               second.setText( item.getDescription() );

               renderer.setBackground(isSelected ? list.getSelectionBackground() : null);
               renderer.setForeground(isSelected ? list.getSelectionForeground() : null);

               return renderer;
          }
     }

     /*
     **  Use HTML to format the text
     */
     class HTMLRenderer extends DefaultListCellRenderer
     {
          private static final String START = "";
          private static final String MIDDLE = " ";
          private static final String END = "";

          public Component getListCellRendererComponent(JList list, Object value,
               int index, boolean isSelected, boolean cellHasFocus)
          {
               super.getListCellRendererComponent(
                    list, value, index, isSelected, cellHasFocus);

               Item item = (Item)value;
               setText(START
                    + item.getId()
                    + MIDDLE
                    + item.getDescription()
                    + END);

               return this;
          }
     }

}

Tags: Java

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support,.
POSTE_HTA_BT
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commit;
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END;
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Error report:
ORA-06550: line 2, colum 34:
PLS-00103: symbol ',' met instead of one of the following symbols:
* & = - + ; <>/ is mod remains not rem
<>< Hurst (*) > or! = or ~ = > = < = <>and like2 or
like4 likec between | submultiset of type multiset Member
ORA-06550: line 2, column 52:
PLS-00103: symbol ';' met instead of one of the following symbols:
), * & = - + <>/ is mod remains not rem = >
<>< Hurst (*) > or! = or ~ = > = < = <>and like2 or
like4 likec between | Member of multiset must
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PLS-00103: symbol 'CHIFFRE_LISTE' met instead of one of the following symbols:
(
Symbol "(" a été substitué à "CHIFFRE_LISTE" verser continuer.) "
ORA-06550: line 39, 12 colum:
PLS-00103: symbol 'W_SUPPORT_X' met instead of one of the following symbols:
), * & -+ / at rem mod < Hurst (*) > rest and or.
multiset
ORA-06550: line 40, 12 colum:
PLS-00103: symbol 'W_SUPPORT_Y' met instead of one of the following symbols:
. (), * @ % & = - + <>/ is mod remains not rem
<>< Hurst (*) > or! = or ~ = > = < = <>and like2 or
like4 likec between | mult
ORA-06550: line 41, colum 9:
PLS-00103: symbol 'END' met instead of one of the following symbols:
. (), * @ % & = - + <>/ is mod remains not rem
<>< Hurst (*) > or! = or ~ = > = < = <>and like2 or
like4 likec between | multiset members
06550 00000 - "line %s, column % s:\n%s".
* Cause: Usually a PL/SQL compilation error.
* Action:
I checked the line number, but do not see the error in my code.
Please could you help me?
peace

Hello

glad to know that it worked. In fact, I don't see the reason to make these complicated processes.

Remember the mantra:
- If you can do it with SQL then do it with SQL
Good evening!

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HTML, body, ul, ol, li, p, h1, h2, h3, h4, h5, h6, form, fieldset {}
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padding: 0;
border: 0;
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margin: 0;
background-color: #00FF99;
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padding: 0;
margin: 0;
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margin: 20px 0 10px 0;
border: 1px solid #000000;
}
{.rightimage}
float: right;
margin: 0 0 20px 15px;
border: 1px solid #000000;
Width: 150px;
}
{.clearit}
display: block;
clear: both;
}
#footer {}
border-top: 1px solid #000000;
background-color: #003366;
color: #FFFFFF;
}
#footer p {}
-font size: 70%;
padding: 3px;
}
{#leftcol}
margin-left: 10px;
top of the margin: 20px;
float: left;
Width: 170px;
height: 150px;
background-color: #FFFF00;
}

You are welcome!

and for learning, please refer to the following links:

http://www.dynamicdrive.com/style/layouts/category/C9/

http://www.456bereastreet.com/lab/developing_with_web_standards/csslayout/2-Col/

Kind regards

Vinay

ComboBox with multiple columns

Is it possible to make a ComboBox with two columns in the drop-down list box?
Thank you

Use the dropdownwidth property

Conversion of an array of unique column in a table of two columns

Hello world

What I'm trying to do is to convert a single column table in a table with two columns. Here is an example:
Table (column):
ID1
ID2
ID3
ID4
ID5

Table B (two columns) must be:
ID1 ID2
ID3 ID4
ID5

I've been browsing through a cursor and do an insert every 2 rows, but do not like performance.
Is there a more easy/fast way to do this?

Thanks in advance
Oscar

with t as (
           select 'ID1' col1 from dual union all
           select 'ID2' from dual union all
           select 'ID3' from dual union all
           select 'ID4' from dual union all
           select 'ID5' from dual
          ) -- end of sample table
select  col1,
        col2
  from  (
         select  col1,
                 lead(col1) over(order by col1) col2,
                 row_number() over(order by col1) rn
           from  t
        )
  where mod(rn,2) = 1
/

COL COL
--- ---
ID1 ID2
ID3 ID4
ID5

SQL>

SY.

JComboBox with two columns

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