@Override
public int getBaseline() {
FontMetrics fm = b.getFontMetrics(b.getFont());
int border = (b.getPreferredSize().height - fm.getHeight()) / 2;
int bestGuess = border + fm.getAscent();
if (PlatformUtils.isMac()) bestGuess -= 1;
return bestGuess;
}
private static int getComboBoxBaseline(JComboBox combobox, int height) {
Insets insets = combobox.getInsets();
int y = insets.top;
height -= (insets.top + insets.bottom);
if (combobox.isEditable()) {
ComboBoxEditor editor = combobox.getEditor();
if (editor != null && (editor.getEditorComponent() instanceof JTextField)) {
JTextField tf = (JTextField) editor.getEditorComponent();
return y + getSingleLineTextBaseline(tf, height);
}
}
// Use the renderer to calculate baseline
if (isMetal()) {
if (isOceanTheme()) {
y += 2;
height -= 4;
}
} else if (isWindows()) {
// This doesn't guarantee an XP style will be active,
// but we don't offer public API to detect if XP is active.
String osVersion = System.getProperty("os.version");
if (osVersion != null) {
Float version = Float.valueOf(osVersion);
if (version.floatValue() > 4.0) {
y += 2;
height -= 4;
}
}
}
ListCellRenderer renderer = combobox.getRenderer();
if (renderer instanceof JLabel) {
int baseline = y + getLabelBaseline((JLabel) renderer, height);
if (isAqua()) {
return baseline - 1;
}
return baseline;
}
// Renderer isn't a label, use metrics directly.
FontMetrics fm = combobox.getFontMetrics(combobox.getFont());
return y + fm.getAscent();
}