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POIn a JTable, how do I render a checkbox column with a dirty marker?
 

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  1. POIn a JTable, how do I render a checkbox column with a dirty marker?
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    <p>I'm trying to show a marker on checkbox columns in a JTable to indicate that the value is dirty.</p> <p>I'm having trouble coming up with a way to render the marker. I've tried setting an icon on the JCheckbox but this just renders the icon instead of the checkbox. I've tried using a Panel but it messes up the layout.</p> <p>Does anyone have an idea what is the best way to do this?</p> <p>Thanks</p> <p>This is the sort of thing I've tried so far:</p> <pre><code>import java.awt.Component; import javax.swing.Icon; import javax.swing.JCheckBox; import javax.swing.JTable; import javax.swing.SwingConstants; import javax.swing.UIManager; import javax.swing.border.Border; import javax.swing.border.EmptyBorder; import javax.swing.table.TableCellRenderer; public class DirtyCheckboxRenderer extends JCheckBox implements TableCellRenderer { private final Border noFocusBorder = new EmptyBorder(1, 1, 1, 1); public DirtyCheckboxRenderer() { setHorizontalAlignment(SwingConstants.CENTER); setBorderPainted(true); } @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { setForegroundColor(table, isSelected); setBackgroundColor(table, isSelected); setCheckboxState(value); setBorder(hasFocus); setDirtyMarkerIcon(); return this; } private void setCheckboxState(Object value) { boolean checked = value != null &amp;&amp; ((Boolean) value).booleanValue(); setSelected(checked); } private void setBorder(boolean hasFocus) { if (hasFocus) { setBorder(UIManager.getBorder("Table.focusCellHighlightBorder")); } else { setBorder(this.noFocusBorder); } } private void setForegroundColor(JTable table, boolean isSelected) { if (isSelected) { setForeground(table.getSelectionForeground()); } else { setForeground(table.getForeground()); } } private void setBackgroundColor(JTable table, boolean isSelected) { if (isSelected) { setBackground(table.getSelectionBackground()); } else { setBackground(table.getBackground()); } } private void setDirtyMarkerIcon() { boolean columnIsDirty = true; //TODO if (columnIsDirty) { Icon icon = getDirtyMarkerIcon(); setHorizontalTextPosition(SwingConstants.TRAILING); setIcon(icon); } else { setIcon(null); } } private Icon getDirtyMarkerIcon() { //TODO return null; // } } </code></pre>
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    1. PTQuestion
    1. USKevin Stembridge
    1. USKevin Stembridge
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    1. This table or related slice is empty.
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    1. PO
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    2. PO
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    3. PO
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    1. This table or related slice is empty.
    1. COYou could help by providing a simple example of what you have right now using `JCheckBox`.
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      1. POIn a JTable, how do I render a checkbox column with a dirty marker?
      1. USPeter Lang
    2. COThanks Peter. Orginal posting edited.
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      1. POIn a JTable, how do I render a checkbox column with a dirty marker?
      1. USKevin Stembridge
 

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