find out if text of JLabel exceeds label size

java swing jlabel sizing
jutky picture jutky · Nov 1, 2011 · Viewed 13.2k times · Source

In Java when the text of the JLabel could not be displayed due to lack of space the text is truncated and "..." is added in the end.

How can I easily find out if currently JLabel displays full text or the truncated?

EDIT:

I see that there is a way to find out the size of the text by using FontMetrics. However this solution doesn't fully answers the question. In the case the text of JLabel contains HTML decorations the metrics.stringWidth() would also calculate width of HTML tags. So it could happen that result of metrics.stringWidth() would be grater than JLabel's width but still the text would be displayed correctly.

Is there a way know what decision took the JLabel itself while displaying the text. Has it decided to truncate the text or not.

Answer

trashgod picture trashgod · Nov 1, 2011

The ellipsis is added by the label's UI delegate, typically a subclass of BasicLabelUI, as part of it's layout and preferred size calculation. The method layoutCL() may be overridden to examine the geometry, as shown on this example.

As a practical matter, I'd ignore the elision and show the full text in a tool tip.

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