Make JCheckbox more ..?

Question

I want my JCheckboxes in JTable bigger (for touch screen), but it doesn't resize.

I tried it with

• setPrefferedSize
• SetSize

What should I do?..

Answer 1

I assume that you mean that you want to set a large check mark. If so, you need to create images to display the unselected and selected icons of this check box. Then you can create a renderer and editor using these icons. Finally, you will need to increase the height of each row in the table. The code might look something like this:

Icon normal = new ImageIcon(...);
Icon selected = new ImageIcon(...);
JTable table = new JTable(...);
table.setRowHeight(...);

TableCellRenderer renderer = table.getDefaultRenderer(Boolean.class);
JCheckBox checkBoxRenderer = (JCheckBox)renderer;
checkBoxRenderer.setIcon( normal );
checkBoxRenderer.setSelectedIcon( selected );

DefaultCellEditor editor = (DefaultCellEditor)table.getDefaultEditor(Boolean.class);
JCheckBox checkBoxEditor = (JCheckBox)editor.getComponent();
checkBoxEditor.setIcon( normal );
checkBoxEditor.setSelectedIcon( selected );

Answer 2

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public static void scaleCheckBoxIcon(JCheckBox checkbox){
    boolean previousState = checkbox.isSelected();
    checkbox.setSelected(false);
    FontMetrics boxFontMetrics =  checkbox.getFontMetrics(checkbox.getFont());
    Icon boxIcon = UIManager.getIcon("CheckBox.icon");
    BufferedImage boxImage = new BufferedImage(
        boxIcon.getIconWidth(), boxIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB
    );
    Graphics graphics = boxImage.createGraphics();
    try{
        boxIcon.paintIcon(checkbox, graphics, 0, 0);
    }finally{
        graphics.dispose();
    }
    ImageIcon newBoxImage = new ImageIcon(boxImage);
    Image finalBoxImage = newBoxImage.getImage().getScaledInstance(
        boxFontMetrics.getHeight(), boxFontMetrics.getHeight(), Image.SCALE_SMOOTH
    );
    checkbox.setIcon(new ImageIcon(finalBoxImage));

    checkbox.setSelected(true);
    Icon checkedBoxIcon = UIManager.getIcon("CheckBox.icon");
    BufferedImage checkedBoxImage = new BufferedImage(
        checkedBoxIcon.getIconWidth(),  checkedBoxIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB
    );
    Graphics checkedGraphics = checkedBoxImage.createGraphics();
    try{
        checkedBoxIcon.paintIcon(checkbox, checkedGraphics, 0, 0);
    }finally{
        checkedGraphics.dispose();
    }
    ImageIcon newCheckedBoxImage = new ImageIcon(checkedBoxImage);
    Image finalCheckedBoxImage = newCheckedBoxImage.getImage().getScaledInstance(
        boxFontMetrics.getHeight(), boxFontMetrics.getHeight(), Image.SCALE_SMOOTH
    );
    checkbox.setSelectedIcon(new ImageIcon(finalCheckedBoxImage));
    checkbox.setSelected(false);
    checkbox.setSelected(previousState);
}

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