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How to create a JCombobox with Checkbox Tree inside of it?

Posted on 2009-04-05
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Last Modified: 2012-05-06
Is there any way to create Checkbox Tree inside JCombobox ?
Usually Checkbox Tree is created with custom tree renderer and editor. But since combobox are using ListcellRenderer, is this applicable?

Thanks.
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Question by:andriana_ria
3 Comments
 
LVL 25

Accepted Solution

by:
InteractiveMind earned 50 total points
ID: 24075821
Yes, you use ListCellRenderer for this. See attached code from:
http://www.coderanch.com/t/343024/Swing-AWT-SWT-JFace/java/Components-inside-JComboBox

import java.awt.*;  

import java.awt.event.*;  

import javax.swing.*;  

   

public class CheckCombo implements ActionListener  

{  

    public void actionPerformed(ActionEvent e)  

    {  

        JComboBox cb = (JComboBox)e.getSource();  

        CheckComboStore store = (CheckComboStore)cb.getSelectedItem();  

        CheckComboRenderer ccr = (CheckComboRenderer)cb.getRenderer();  

        ccr.checkBox.setSelected((store.state = !store.state));  

    }  

   

    private JPanel getContent()  

    {  

        String[] ids = { "north", "west", "south", "east" };  

        Boolean[] values =  

        {  

            Boolean.TRUE, Boolean.FALSE, Boolean.FALSE, Boolean.FALSE  

        };  

        CheckComboStore[] stores = new CheckComboStore[ids.length];  

        for(int j = 0; j < ids.length; j++)  

            stores[j] = new CheckComboStore(ids[j], values[j]);  

        JComboBox combo = new JComboBox(stores);  

        combo.setRenderer(new CheckComboRenderer());  

        combo.addActionListener(this);  

        JPanel panel = new JPanel();  

        panel.add(combo);  

        return panel;  

    }  

   

    public static void main(String[] args)  

    {  

        JFrame f = new JFrame();  

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  

        f.getContentPane().add(new CheckCombo().getContent());  

        f.setSize(300,160);  

        f.setLocation(200,200);  

        f.setVisible(true);  

    }  

}  

   

/** adapted from comment section of ListCellRenderer api */  

class CheckComboRenderer implements ListCellRenderer  

{  

    JCheckBox checkBox;  

   

    public CheckComboRenderer()  

    {  

        checkBox = new JCheckBox();  

    }  

    public Component getListCellRendererComponent(JList list,  

                                                  Object value,  

                                                  int index,  

                                                  boolean isSelected,  

                                                  boolean cellHasFocus)  

    {  

        CheckComboStore store = (CheckComboStore)value;  

        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;  

    }  

}

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Expert Comment

by:Julien_Bodin
ID: 34083089
I think the problem is not solved.

The question was about a CheckBoxTree and not a CheckBoxList which is completely different things. The first is more difficult to implement.
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