Shortend text in JTree

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Carsten Zerbst - 01 Jun 2005 10:41 GMT

Hello,

sometimes I need to display objects with rather long
names in the JTree. Unfortunately my strings are abbreviated
and "..." is appended. My TreeCellRenderer is based
on the DefaultTreeCellRenderer, but I do not find the
reason for the abbreviation.

Does anybody knows how is shortening my text ?

Thanks, Carsten

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Roland - 01 Jun 2005 23:57 GMT

> Hello,
>
[quoted text clipped - 7 lines]
>
> Thanks, Carsten

I've never experienced abbreviated tree node labels.
Can you show a short self contained compilable example demonstrating
this behaviour.

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Roland de Ruiter
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Andrew Thompson - 02 Jun 2005 03:25 GMT

> Can you show a short self contained compilable example demonstrating
> this behaviour.

For more details on preparing an SSCCE..
<http://www.physci.org/codes/sscce.jsp>

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Bent C Dalager - 02 Jun 2005 13:16 GMT

>> Does anybody knows how is shortening my text ?

JLabel does this when there is not enough room to display the entire
string (and the default renderer uses JLabel I think). My guess is
that your tree decides how much room is available to the tree node at
some early point. Later, more room is made available but the tree
doesn't notice and so when the node is drawn, the JLabel thinks it has
a lot less room than what is actually the case. Or perhaps you first
set one string that is short and then one that is long and it hangs on
to the preferred size of the first one for some reason.

Cheers
Bent D

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Carsten Zerbst - 03 Jun 2005 12:46 GMT

Am Wed, 01 Jun 2005 11:41:20 +0200 schrieb Carsten Zerbst:

> sometimes I need to display objects with rather long
> names in the JTree. Unfortunately my strings are abbreviated
> and "..." is appended.

After some tinkering, I (hopefully) found the reason for
the behaviour.

In my TreeCellRenderer I use the DefaultTreeCellRenderer
by delegation. In most cases I just use the returnvalue
of the DTCR, but in certain cases I override certain
attributes in the returnvalue like text or icon.

In those cases the preferred dimensions have to be updated,
otherwise the text is abbreviated.

By the way I recommend to take a look at https://datatips.dev.java.net/ :-)

Some code:

-----------------
public Component getTreeCellRendererComponent( JTree tree, Object value, boolean selected,
boolean expanded, boolean leaf, int row, boolean hasFocus ) {
Component retval = null;

    //    .. use DefaultTreeCellRenderer by delegation

    //    ... update some attributes

if ( retval instanceof JLabel ) {
JLabel lab = ( JLabel ) retval;
int width = 20;
if ( lab.getIcon( ) != null ) {
width += lab.getIcon( ).getIconWidth( );
}

if ( lab.getText( ) != null ) {
width += SwingUtilities.computeStringWidth( lab.getFontMetrics( lab.getFont( ) ),
lab.getText( ) );
}

Dimension nd = new Dimension( width, (int) lab.getPreferredSize().getHeight());
lab.setPreferredSize( nd );
}

    return retval;
}
------------

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Andrey Kuznetsov - 06 Jun 2005 21:38 GMT

> By the way I recommend to take a look at https://datatips.dev.java.net/
> :-)

or at
http://jgui.imagero.com/doc/com/imagero/gui/swing/TLToolTipManager.html

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Andrey Kuznetsov
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Karsten Lentzsch - 20 Jun 2005 13:47 GMT

> sometimes I need to display objects with rather long
> names in the JTree. Unfortunately my strings are abbreviated
[quoted text clipped - 3 lines]
>
> Does anybody knows how is shortening my text ?

Likely you've changed the tree node's label
and have not notified the tree views (JTree)
about that change. That can and should be done
by firing an appropriate TreeModelEvent.

See TreeModelListener#treeNodesChanged and
DefaultTreeModel#nodesChanged or
DefaultTreeModel#fireTreeNodesChanged

Best regards from Kiel (Week),
Karsten Lentzsch

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Shortend text in JTree

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