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PONot Editable JComboBox Border
 

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    <p>I am using Metal L&amp;F. I want to make a <b>JComboBox</b>, that has only 1 pixel border. This not a problem, as long as the cb is <b>editable</b>. This corresponds to the first cb in the picture named "Editable".</p> <pre><code>cb.setEditable(true); ((JTextComponent) (cb.getEditor().getEditorComponent())).setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, COLOR)); </code></pre> <p>But when I do <b>cb.setEditable(false)</b>, an additional border occurs inside the box (changed to red in the picture "Dropdown", you see the original color in the picture named "Fixed"). Although I tried to set the border and I also tried to use my own CellRenderer, the border still gets painted. It seems to me, that the unwanted border does not come from the CellRenderer. When I try to manipulate the border from the cb itself (see comment //), it only adds/removes an additional outer border. The editorComponent also seems not to be responsible to me.</p> <pre><code>cb.setRenderer(new CbCellRenderer()); //cb.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, COLOR)); //cb.setBorder(BorderFactory.createEmptyBorder()); class CbCellRenderer implements ListCellRenderer { protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer(); @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); renderer.setBorder(BorderFactory.createEmptyBorder()); return renderer; } } </code></pre> <p>I also tried out some UI variables like the ones below without taking affect on this border.</p> <pre><code>UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); UIManager.put("ComboBox.selectionForeground", Color.green); UIManager.put("ComboBox.disabledBackground", Color.green); ... </code></pre> <p><img src="https://i.stack.imgur.com/Cq9Wh.jpg" alt=""></p> <p>Image: <a href="http://upload.mtmayr.com/dropdown_frame.png" rel="nofollow noreferrer">http://upload.mtmayr.com/dropdown_frame.png</a> <sup>(link broken)</sup></p> <p>Complete code for testing:</p> <pre><code>import java.awt.*; import java.util.Vector; import javax.swing.*; import javax.swing.plaf.basic.BasicComboPopup; public class ComboTest { private Vector&lt;String&gt; listSomeString = new Vector&lt;String&gt;(); private JComboBox editableComboBox = new JComboBox(listSomeString); private JComboBox nonEditableComboBox = new JComboBox(listSomeString); private JFrame frame; public final static Color COLOR_BORDER = new Color(122, 138, 153); public ComboTest() { listSomeString.add("row 1"); listSomeString.add("row 2"); listSomeString.add("row 3"); listSomeString.add("row 4"); editableComboBox.setEditable(true); editableComboBox.setBackground(Color.white); Object child = editableComboBox.getAccessibleContext().getAccessibleChild(0); BasicComboPopup popup = (BasicComboPopup) child; JList list = popup.getList(); list.setBackground(Color.white); list.setSelectionBackground(Color.red); JTextField tf = ((JTextField) editableComboBox.getEditor().getEditorComponent()); tf.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, COLOR_BORDER)); nonEditableComboBox.setEditable(false); nonEditableComboBox.setBorder(BorderFactory.createEmptyBorder()); nonEditableComboBox.setBackground(Color.white); Object childNonEditable = nonEditableComboBox.getAccessibleContext().getAccessibleChild(0); BasicComboPopup popupNonEditable = (BasicComboPopup) childNonEditable; JList listNonEditable = popupNonEditable.getList(); listNonEditable.setBackground(Color.white); listNonEditable.setSelectionBackground(Color.red); frame = new JFrame(); frame.setLayout(new GridLayout(0, 1, 10, 10)); frame.add(editableComboBox); frame.add(nonEditableComboBox); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocation(100, 100); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { ComboTest ct = new ComboTest(); } }); } } </code></pre>
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    1. COsimilar postings: [link1](http://stackoverflow.com/questions/10569759/border-editor-when-rendering-item-in-jcombobox-and-editable-false) [link2](http://stackoverflow.com/questions/10169022/jcombobox-does-not-behave-same-as-jtextfield-how-can-i-have-it-look-similar) [link3](http://stackoverflow.com/questions/9322903/how-do-you-change-border-of-the-pop-up-section-of-a-jcombobox) [link4](http://stackoverflow.com/questions/776893/remove-border-from-jcombobox)
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