If you need tooltips for elements in an SWT Tree or JFace TreeViewer, you had to jump through some hoops as Snippet 125 shows.
Since SWT/JFace 3.3, you should use a TreeViewer, a ColumnLabelProvider (which has all those cool getTooltip…() methods) and this line of code:
ColumnViewerToolTipSupport.enableFor (viewer);
That’s it. There is a catch, though: The tooltip doesn’t wrap automatically. If you have long lines of text, you need commons-lang and this piece of code:
private String wrap (String s)
{
StringBuilder buffer = new StringBuilder ();
String delim = "";
for (String line: s.trim ().split ("\n"))
{
buffer.append (delim);
delim = "\n";
buffer.append (WordUtils.wrap (line, 60, "\n", true));
}
return buffer.toString ();
}
Note that this code is only necessary if you have several lines of text in the tooltip. For single long lines, WordUtils.wrap() alone is enough.
Posted by digulla 
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