How to make a JTree leaf look like a folder

6 Message(s) by 4 Author(s) originally posted in java help

From: Rita Leon

Date: Thursday, October 18, 2007

Here is my very simple code:

JAVAx.swing.JTree tree;

...

DefaultMutableTreeNode root

1. <operating system> The {Unix} {superuser} account (with
	user name "root" and user ID 0) that overrides file
	permissions.  The term {avatar} is also used.  By extension,
	the privileged system-maintenance login on any {operating
	system}.

	See {root mode}, {go root}, {wheel}.

	[{Jargon File}]

	(1994-10-27)

	2. <operating system> {root directory}.

	(1996-11-21)

	3. <data> {root node}.

	(1998-11-14)

= new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat = new DefaultMutableTreeNode("Category");
root.add(cat);
DefaultTreeModel dataRoot = new DefaultTreeModel(root);
tree.setModel(dataRoot);The problem is the icon for "cat" shows as the sheet of paper icon.
How do I get JTree to display

1. <hardware> {monitor}.

	2. <language> A vector of pointers to {activation records}.
	The Nth element points to the activation record containing
	variables declared at {lexical depth} N.  This allows faster
	access to variables from outer {scopes} than the alternative
	of linked activation records (but most variable accesses are
	either local or global or occasionally to the immediately
	enclosing scope).  Displays were used in some {ALGOL}
	implementations.

	(1996-02-22)

"cat"'s icon as the folder

<operating system> A {directory} in the sense of a collection
	of computer {files}.  The term is more common in systems such
	as the {Macintosh} or {Windows 95} which have a {graphical
	user interface} and provide a graphical {file browser} in
	which directories are traditionally depicted as folders (like
	small briefcases).

	(1997-03-20)

icon like
that of "root" without adding a child

<mathematics, data> (Or "child", "successor") In a {tree}, a
	{node} pointed to by a {parent}, i.e. another node closer to
	the {root node}.

	(1998-11-14)

or changing the graphics?

ty

From: Steve W. Jackson

Date: Thursday, October 18, 2007

In article <rt0fh39l363c0ogu01bakoh3b24hf4fmpv@xxxxxxxxxxx>,
wrote in message:

Here is my very simple code:
JAVAx.swing.JTree tree;
...
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat = new DefaultMutableTreeNode("Category");
root.add(cat);
DefaultTreeModel dataRoot = new DefaultTreeModel(root);
tree.setModel(dataRoot);
The problem is the icon for "cat" shows as the sheet of paper icon.
How do I get JTree to display "cat"'s icon as the folder icon like
that of "root" without adding a child or changing the graphics?
ty

Depends what you mean by "changing the graphics"...

Take a look at the tree's cell

<networking> {ATM}'s term for a {packet}.

	(1996-08-21)

renderer. By default, it uses a
DefaultTreeCellRenderer. As you have seen, adding a child automatically
results in using the folder icon. But if you want to change that
behavior without adding a child, you *must* make some kind of graphic
change. At its simplest, you can use a small class

1. <programming> The prototype for an {object} in an
	{object-oriented language}; analogous to a {derived type} in a
	{procedural language}.  A class may also be considered to be a
	set of objects which share a common structure and behaviour.
	The structure of a class is determined by the {class
	variables} which represent the {state} of an object of that
	class and the behaviour is given by a set of {methods}
	associated with the class.

	Classes are related in a {class hierarchy}.  One class may be
	a specialisation (a "{subclass}") of another (one of its
	"{superclasses}") or it may be composed of other classes or it
	may use other classes in a {client-server} relationship.  A
	class may be an {abstract class} or a {concrete class}.

	See also {signature}.

	2. <programming> See {type class}.

	3. <networking> One of three types of {Internet addresses}
	distinguished by their most significant bits.

	3. <language> A language developed by the {Andrew Project}.
	It was one of the first attempts to add {object-oriented}
	features to {C}.

	(1995-05-01)

extending the
DefaultTreeCellRenderer and override getTreeCellRendererComponent so
that the renderer uses the folder on a leaf node

1. A point or vertex in a {graph}.

	2. {network node}.

	3. A {hypertext} document.

.

= Steve =
--
Steve W. Jackson
Montgomery, Alabama

From: Daniel Dyer

Date: Thursday, October 18, 2007

On Thu, 18 Oct 2007 18:44:45 +0100, Steve W. Jackson =

wrote in message:

In article <rt0fh39l363c0ogu01bakoh3b24hf4fmpv@xxxxxxxxxxx>,
wrote in message:
Here is my very simple code:

JAVAx.swing.JTree tree;

...

DefaultMutableTreeNode root =3D new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat =3D new DefaultMutableTreeNode("Category")=
;
root.add(cat);
DefaultTreeModel dataRoot =3D new DefaultTreeModel(root);
tree.setModel(dataRoot);

The problem is the icon for "cat" shows as the sheet of paper icon.
How do I get JTree to display "cat"'s icon as the folder icon like
that of "root" without adding a child or changing the graphics?

ty
Depends what you mean by "changing the graphics"...
Take a look at the tree's cell renderer. By default, it uses a
DefaultTreeCellRenderer. As you have seen, adding a child automatically=

results in using the folder icon. But if you want to change that
behavior without adding a child, you *must* make some kind of graphic
change. At its simplest, you can use a small class extending the
DefaultTreeCellRenderer and override getTreeCellRendererComponent so
that the renderer uses the folder on a leaf node.
=3D Steve =3D

Alternatively, you can use UIDefaults to change the default icons for a =
=

JTree. If you print out all of the properties you will find the ones you =
=

need, just set the leaf node property to be the same as the non-leaf one=
.

Dan.

-- =

Daniel Dyer
http//www.uncommons.org

From: Steve W. Jackson

Date: Thursday, October 18, 2007

In article <op.t0enb5ul8kxvgr@xxxxxxxxxxx>,
wrote in message:

[ snip ]

Alternatively, you can use UIDefaults to change the default icons for a
JTree. If you print out all of the properties you will find the ones you
need, just set the leaf node property to be the same as the non-leaf one.
Dan.

That's even easier than a renderer -- neat. It'd apply to all JTree
uses throughout an application, I presume. But if that's not an issue,
it's simpler.

= Steve =
--
Steve W. Jackson
Montgomery, Alabama

From: bcd

Date: Thursday, October 18, 2007

In article <rt0fh39l363c0ogu01bakoh3b24hf4fmpv@xxxxxxxxxxx>,
wrote in message:

Here is my very simple code:
JAVAx.swing.JTree tree;
...
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat = new DefaultMutableTreeNode("Category");
root.add(cat);
DefaultTreeModel dataRoot = new DefaultTreeModel(root);
tree.setModel(dataRoot);
The problem is the icon for "cat" shows as the sheet of paper icon.
How do I get JTree to display "cat"'s icon as the folder icon like
that of "root" without adding a child or changing the graphics?

The following might work:

DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat = new DefaultMutableTreeNode("Category");
root.add(cat);
DefaultTreeModel dataRoot = new DefaultTreeModel(root)
{
public boolean isLeaf(Object node) { return false; }
}
tree.setModel(dataRoot);

Cheers
Bent D
--
Bent Dalager - bcd@xxxxxxxxxxx - http://www.pvv.org/~bcd
powered by emacs

From: bcd

Date: Thursday, October 18, 2007

In article <ff8ch3$2t2$1@xxxxxxxxxxx>,
wrote in message:

DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode cat = new DefaultMutableTreeNode("Category");
root.add(cat);
DefaultTreeModel dataRoot = new DefaultTreeModel(root)
{
public boolean isLeaf(Object node) { return false; }
}

Add a semicolon

;

	Common: {ITU-T}: semicolon; {semi}.  Rare: weenie; {INTERCAL}:
	hybrid, pit-thwong.

here I suppose.

tree.setModel(dataRoot);

Cheers again,
Bent D.
--
Bent Dalager - bcd@xxxxxxxxxxx - http://www.pvv.org/~bcd
powered by emacs

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