CODEWITHSUNDEEP
javaswingjtablejcheckboxtablecellrenderer
theraven
theraven

Reputation: 5045

How to make JTable column contain checkboxes?

Preface: I am horrible with java, and worse with java ui components.

I have found several different tutorials on how to add buttons to tables, however I am struggling with adding checkboxes. I need to have a column that draws a text box ticked on default (cell renderer i think handles that), then on click of tickbox, unticks the box, redraws said box, and fires off an event somewhere I can track.

currently I have a custom cellrenderer:

public class GraphButtonCellRenderer extends JCheckBox implements TableCellRenderer {
public GraphButtonCellRenderer() {
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    if(isSelected)
        setSelected(true);
    else
        setSelected(false);
    setMargin(new Insets(0, 16, 0, 0));
    setIconTextGap(0);

    setBackground(new Color(255,255,255,0));
    return this;
}}

Which currently handles drawing the tick box, but only ticks and unticks the box if that row is selected. But I don't know how to handle the events. Really what I am asking is possibly a link to a good tutorial on how to add checkboxes cleanly to a JTable. Any assist is greatly appreciated :)

Upvotes: 8

Views: 51898

Answers (5)

insufferableKnowItAll
insufferableKnowItAll

Reputation: 29

In the Swing Designer set column type to boolean

Upvotes: -5

Jay Askren
Jay Askren

Reputation: 10454

There's no need to create your own table renderer. Here's a simpler example. Just create a custom table model and for a given column return the class Boolean for:

public Class getColumnClass(int column)

If you want the column to be editable, return true for

public boolean isCellEditable(int row, int column)

JTable takes care of the rendering for you.

Another example is here.

Upvotes: 26

Kachwahed
Kachwahed

Reputation: 552

As Peter say, its easy using extended DefaultTableModel class, ex:

class NewTableModel extends DefaultTableModel{
        public Class<?> getColumnClass(int columnIndex) {
            return getValueAt(0, columnIndex).getClass();
        }
    }

Upvotes: 7

Peter
Peter

Reputation: 5798

The easiest solution is to use the DefaultTableModel and use Boolean object as values.

Upvotes: 3

trashgod
trashgod

Reputation: 205875

Here's a simple rather elaborate example using a TableCellRenderer and TableCellEditor. See also, Concepts: Editors and Renderers.

Addendum: @Jay Askren's point is well taken. The default renderer for Boolean.class, as described in the tutorial, may be all you need.

Upvotes: 4

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