Code
final JButton arrowButton = getArrowButton(combo02);
combo02.setRenderer(new DefaultListCellRenderer() {
@Override public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
int itb = 0, ilr = 0;
Insets insets = getInsets();
itb += insets.top + insets.bottom;
ilr += insets.left + insets.right;
insets = combo02.getInsets();
itb += insets.top + insets.bottom;
ilr += insets.left + insets.right;
int availableWidth = combo02.getWidth() - ilr;
if (index < 0) {
// @see BasicComboBoxUI#rectangleForCurrentValue
int buttonSize = combo02.getHeight() - itb;
if (arrowButton != null) {
buttonSize = arrowButton.getWidth();
}
availableWidth -= buttonSize;
JTextField tf = (JTextField) combo02.getEditor().getEditorComponent();
insets = tf.getMargin();
availableWidth -= (insets.left + insets.right);
}
String cellText = (value != null) ? value.toString() : "";
// <blockquote cite="https://tips4java.wordpress.com/2008/11/12/left-dot-renderer/">
// @title Left Dot Renderer
// @auther Rob Camick
FontMetrics fm = getFontMetrics(getFont());
if (fm.stringWidth(cellText) > availableWidth) {
String dots = "...";
int textWidth = fm.stringWidth(dots);
int nChars = cellText.length() - 1;
while (nChars > 0) {
textWidth += fm.charWidth(cellText.charAt(nChars));
if (textWidth > availableWidth) break;
nChars--;
}
setText(dots + cellText.substring(nChars + 1));
}
// </blockquote>
return this;
}
});
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