/**
* Gets the displayed value, and uses the converter to convert the shared value to units this
* instance is supposed to represent. If the displayed value and shared value are different,
* then we turn off our document filter and update our value to match the shared value. We
* re-enable the document filter afterwards.
*/
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
try {
StyledDocument doc = getStyledDocument();
double actualValue = (multiplier.getDisplayValue(value.getValue()));
String actualValueAsString = df.format(actualValue);
String displayedValue;
try {
displayedValue = doc.getText(0, doc.getLength());
} catch (BadLocationException e) {
displayedValue = "";
}
if (displayedValue.isEmpty()) {
displayedValue = "0";
}
double displayedValueAsDouble = Double.parseDouble(displayedValue);
if (!actualValueAsString.equals(displayedValue)
&& displayedValueAsDouble != actualValue) // Allow user to enter trailing zeroes.
{
bypassFilterAndSetText(doc, actualValueAsString);
}
} catch (NumberFormatException e) {
// Swallow it as it's OK for the user to try and enter non-numbers.
}
}
protected void bypassFilterAndSetText(StyledDocument doc, String text) {
try {
filter.setUpdateValue(false);
doc.remove(0, doc.getLength());
doc.insertString(0, text, null);
} catch (BadLocationException e) {
java.awt.Toolkit.getDefaultToolkit().beep();
} finally {
filter.setUpdateValue(true);
}
}