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POJTree: variable row height
 

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  1. POJTree: variable row height
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    <p>I'd like my JTree to have variable row heights. From what I've read, all I have to do is <code>setRowHeight(0)</code> and implement a custom <code>TreeCellRenderer</code>. Inside the TreeRenderer different borders are set, depending on the item. however, when a border is added, row height still remains the same. For example, when an <code>EmptyBorder(0,0,8,0)</code> is added, the label moves to the top by 8 pixels. So instead of the expected result on the left, the tree looks something like on the right: </p> <pre><code> EXPECTED: RESULT: _ _ |-|_| Item 1 |-|_| Item 1 | _ | |_| Item 2 |-|_| Item 2 |- | | _ | _ |-|_| Item 3 |-|_| Item 3 </code></pre> <p>This is essentially my code: </p> <pre><code>JTree tree = new MyTree(root); class MyTree extends JTree{ public MyTree(DefaultMutableTreeNode root){ super(root); setCellRenderer(new CustomCellRenderer()); setRowHeight(0); } class CustomCellRenderer extends DefaultTreeCellRenderer { @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row, boolean hasFocus) { JComponent c = (JComponent) super.getTreeCellRendererComponent(tree, value, isSelected, expanded, leaf, row, hasFocus); Data d = (Data)((DefaultMutableTreeNode) value).getUserData(); int bttm = 0; if(d.isTrue()){ bttm = 8; } c.setBorder(BorderFactory.createEmptyBorder(0, 0, bttm, 0)); //setting size didn't show any effect either: //c.setPreferredSize(new Dimension(150, 16+bttm)); return c; } } </code></pre>
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    1. COas already @Holger mentioned: the horizontal line is always centered relative to the height of the node, nothing you can do about it. Curious why would you want it?
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