Checkbox items incombobox rendering

[charanjeeta singh]

Hi All,
I am trying to show checkboxes in combobox i.e. each element in the combobox will be a checkbox so that user can

select multiple options in the combobox. This will be same as "AutoFilter Option in MS Excel 2007". After much

googling around, I have the following solution with only one issue pending:

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.JComboBox;
import java.awt.event.ActionEvent;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.JCheckBox;
import java.awt.Component;
import java.awt.Color;

public class CheckCombo1
    extends JFrame {

  JPanel buttonPanel;
  CheckCombo checkCombo;

  public CheckCombo1() {

    buttonPanel = new JPanel();
    checkCombo = new CheckCombo();
    checkCombo.addItem(new CheckComboStore("Item-A", true));
    checkCombo.addItem(new CheckComboStore("Item-B", true));
    checkCombo.addItem(new CheckComboStore("Item-C", true));
    buttonPanel.add(checkCombo);
    getContentPane().add(buttonPanel, BorderLayout.NORTH);

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(650, 250);
    setVisible(true);
  }

  public static void main(String args[]) {
    CheckCombo1 fe = new CheckCombo1();
  }

  class CheckCombo
      extends JComboBox {
    CheckComboRenderer renderer;
    public CheckCombo() {
      renderer = new CheckComboRenderer();
      setRenderer(renderer);
      addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
      System.out.println("action");
      CheckComboStore store = (CheckComboStore) getSelectedItem();
//      CheckComboRenderer ccr = (CheckComboRenderer) getRenderer();
      store.state = !store.state;
//      ccr.checkBox.setSelected(store.state);
      repaint();
    }

    public void setPopupVisible(boolean flag) {
    }

  }

  class CheckComboRenderer
      implements ListCellRenderer {
    JCheckBox checkBox;

    public CheckComboRenderer() {
      checkBox = new JCheckBox();
//      checkBox.addActionListener(new java.awt.event.ActionListener() {
//        public void actionPerformed(ActionEvent e) {
//          System.out.println("here");
//        }
//      }
//      );
    }

    public Component getListCellRendererComponent(JList list,
                                                  Object value,
                                                  int index,
                                                  boolean isSelected,
                                                  boolean cellHasFocus) {
      CheckComboStore store = (CheckComboStore) value;
      System.out.println("text=" + store.id + " state=" +
                         store.state.booleanValue());
      checkBox.setText(store.id);
      checkBox.setSelected( ( (Boolean) store.state).booleanValue());
      checkBox.setBackground(isSelected ? Color.red : Color.white);
      checkBox.setForeground(isSelected ? Color.white : Color.black);
      return checkBox;
    }
  }

  class CheckComboStore {
    String id;
    Boolean state;

    public CheckComboStore(String id, Boolean state) {
      this.id = id;
      this.state = state;
    }
  }
}

When you run the above code, you will see a combo box with three elements, "Item-A", "Item-B" and "Item-C". All the

three elements are checkboxes so that user can select multiple options. However, if you will select the option which

is already selected in the combobox, its checkbox will not be rendered correctly, even though the state of the

checkbox has changed correctly.
Ex: On running the sample application, if you open the combobox and select the "Item-A", its checkbox will not be

rendered correctly. If you move the mouse over other item (with pop up already opened), you will see the state of

the "Item-A" checkbox has indeed changed but it is not showing correctly. The same thing happens whenever you select

a already selected item in the combobox. It seems there is some rendering issue.
Please help.
Thanks,
Charanjeet

[Darryl Burke]

Charanjeet, welcome to the Ranch! Please BeForthrightWhenCrossPostingToOtherSites.
http://www.java-forums.org/awt-swing/36086-checkbox-items-combox-rendering.html

edit http://forums.oracle.com/forums/thread.jspa?threadID=2143880

[charanjeeta singh]

Quite obviously, the person looking for an answer to his/her query will post his query to different forums. And will obvoiusly choose the best answer that he will get from different forums. I dont understand the fuss about it.
Different folks follow different forums so to get the best answer, person will definitely post to different forums.
I have posted this to
Oracle (http://forums.oracle.com/forums/thread.jspa?messageID=9212576&)
Java Forums: http://www.java-forums.org/awt-swing/36086-checkbox-items-combox-rendering.html
Coderanch: http://www.coderanch.com/t/520234/GUI/java/Checkbox-items-incombobox-rendering
Codeguru: http://www.codeguru.com/forum/showthread.php?t=506434

[Rob Spoor]

charanjeeta singh wrote:Quite obviously, the person looking for an answer to his/her query will post his query to different forums. And will obvoiusly choose the best answer that he will get from different forums. I dont understand the fuss about it.
Different folks follow different forums so to get the best answer, person will definitely post to different forums.

We don't mind cross posting, as long as you tell us (and the other forum users). We might go spending quite a bit of time trying to find a solution, only to then find out that solution was already given on a different forum. It will make us feel like we wasted our time.

[Darryl Burke]

charanjeeta singh wrote:Quite obviously, the person looking for an answer to his/her query will post his query to different forums.

Nothing obvious about it.