Two images in JTreeNode?

Question

I have some custom JTree. That tree has nodes with custom icons. I also have a class that extends DefaultTreeCellRenderer with method getTreeCellRendererComponent as simple as this:

super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
MyTreeNode node = ((MyTreeNode) value);
Icon icon = node.getIcon();
setIcon(icon);
return this;

It works. My tree nodes will be rendered with custom icons in ICON TEXT format. BUT! Is there a way to put TWO icons in my node! I would like to have a node that looks like this: ICON TEXT ANOTHER_JLABEL_WITH_IMAGE.

How to do it?

score 2 · Accepted Answer · answered Oct 16 '12 at 09:44

2

You should create your own TreeCellRenderer that extends from something like a JPanel.

This way, you can define your own layout requirements and add your own components to support your requirements

answered Oct 16 '12 at 09:44

MadProgrammer

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score 2 · Answer 2 · answered Oct 16 '12 at 10:50

2

You can also create an Icon which combines two (or more) other icons. See for example http://tips4java.wordpress.com/2009/03/29/compound-icon/

answered Oct 16 '12 at 10:50

Walter Laan

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score 1 · Answer 3 · answered Oct 16 '12 at 09:51

1

The default component used to render a Tree node is a JLabel. Thus you have access to the setIcon method.

But if you want to set two icons to a node you need to create a JPanel with two labels in it.

answered Oct 16 '12 at 09:51

mkhelif

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I tried that, but then my tree (with 11 000 nodes) is too slow! – guest86 Oct 16 '12 at 09:58
1

You must not create a two icons label per node, but only one for the entire tree. You should have a look on how TreeCellRenderer is designed (flyweight pattern). – mkhelif Oct 16 '12 at 10:08
You mean, like i "singleton label" that is used in all nodes? – guest86 Oct 16 '12 at 10:29
2

`with 11 000 nodes ???` == apply `Renderer` only to the visible `Rectangle` returned from `JVievport` – mKorbel Oct 16 '12 at 10:35
This is already handled by Swing. Only the nodes being shown are painted. – mkhelif Oct 16 '12 at 11:33

score 1 · Answer 4 · edited May 23 '17 at 12:04

(J)Component / JLabel (returned by Renderer) haven't implemented any LayoutManager in the API
right JLabel has constructor for Text and Icon, there is not place for another Icon
basically every JComponents are containers too, part of Containers have got implemented LayoutManager in the API (JFrame, JPanel), you can to put any JComponent to the another
for example
great workarounds by camickr, especially Compound Icon

Two images in JTreeNode?

4 Answers4