JTree : modifier le font du label du node parent

Salut,

Tout ce qui concerne le rendu (l'affichage) particulier des nœuds d'un JTree se fait par un TreeCellRenderer. Pour un nœud donné, il faut déterminer si l'un de ses fils est checked, et choisir la police en fonction, et l'appliquer au TreeCellRenderer. Il faut également penser à rafraichir l'affichage de tous les pères lors de l'édition, puisque la police ne change pas sur le nœud qui change, mais sur ses pères (le plus simple étant de repeindre l'arbre).

Exemple (j'ai mis des commentaires là où se trouvent les parties importantes) :
Code:
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public class TreeCellRendererDemo {
 
	public static void main(String[] args) {
		SwingUtilities.invokeLater(() -> new TreeCellRendererDemo());
	}
 
	public TreeCellRendererDemo() {
 
		JFrame frame = new JFrame("Démo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
		frame.getContentPane().add(new JScrollPane(createTree()));
 
		frame.setSize(300, 300);
		frame.setLocationRelativeTo(null);
		frame.setVisible(true);
 
	}
 
	private Component createTree() {
		JTree tree = new JTree(createTreeNode(FileSystemView
				.getFileSystemView().getDefaultDirectory().toPath()));
		tree.setRootVisible(false);
		tree.setShowsRootHandles(true);
		tree.setCellRenderer(new PathNodeTreeCellRenderer());
		PathNodeCellEditor editor = new PathNodeCellEditor();
		tree.setCellEditor(editor);
		editor.addCellEditorListener(new CellEditorListener() {
 
			@Override
			public void editingStopped(ChangeEvent e) {
				// ******************************************************************************* POUR VOIR CHANGEMENT POLICE SI UN DES FILS EST SELECTIONNE
				tree.repaint(); 
				// ******************************************************************************* POUR VOIR CHANGEMENT POLICE SI UN DES FILS EST SELECTIONNE
			}
 
			@Override
			public void editingCanceled(ChangeEvent e) {
			}
		});
		tree.setEditable(true);
		return tree;
	}
 
	private PathNode createTreeNode(Path parent) {
		boolean isDirectory = Files.isDirectory(parent);
		PathNode parentNode = new PathNode(parent, isDirectory);
		if (isDirectory) {
			Set<Path> paths = new TreeSet<>((p1, p2) -> {
				boolean d1 = Files.isDirectory(p1);
				boolean d2 = Files.isDirectory(p2);
				if ((d1 && d2) || (!d1 && !d2)) {
					return p1.toString().compareTo(p2.toString());
				} else if (d1) {
					return -1;
				} else {
					return 1;
				}
			});
			try (DirectoryStream<Path> ds = Files.newDirectoryStream(parent)) {
				for (Path child : ds) {
					paths.add(child);
				}
				for (Path path : paths) {
					parentNode.add(createTreeNode(path));
				}
			} catch (IOException e) {
				// throw new RuntimeException(e);
			}
		}
		return parentNode;
	}
 
	private static class PathNode extends DefaultMutableTreeNode {
 
		private static final long serialVersionUID = 1L;
		private Path path;
		private boolean directory;
		private boolean checked;
 
		public PathNode(Path path, boolean directory) {
			setUserObject(path);
			this.directory = directory;
		}
 
		public boolean isChecked() {
			return checked;
		}
 
		public void setChecked(boolean checked) {
			this.checked = checked;
		}
 
		public String getName() {
			return path.getFileName().toString();
		}
 
		public boolean isDirectory() {
			return directory;
		}
 
		@Override
		public void setUserObject(Object userObject) {
			Objects.requireNonNull(userObject);
			this.path = (Path) userObject;
			super.setUserObject(userObject);
		}
 
		/*public Path getPathObject() {
			return path;
		}*/
 
		public boolean isChecked(boolean deep) {
			if ( deep ) {
				boolean checked = false;
				for(int i=0; i<getChildCount(); i++) {
					PathNode child = (PathNode) getChildAt(i);
					if ( child.isChecked() ) {
						checked = true;
						break;
					}
					if ( child.isChecked(true) ) {
						checked = true;
						break;
					}
				}
				return checked;
			}
			else {
				return isChecked();
			}
		}
 
	}
 
	private static class PathTreeCellRenderer extends DefaultTreeCellRenderer {
 
		private static final long serialVersionUID = 1L;
 
		@Override
		public Component getTreeCellRendererComponent(JTree tree, Object value,
				boolean selected, boolean expanded, boolean leaf, int row,
				boolean hasFocus) {
			PathNode node = (PathNode) value;
			if (node.isDirectory()) {
				leaf = false;
			}
			Component component = super.getTreeCellRendererComponent(tree,
					value, selected, expanded, leaf, row, hasFocus);
			setText(node.getName());
			// ******************************************************************************* CHANGEMENT POLICE SI UN DES FILS EST SELECTIONNE
			if ( node.isChecked(true) ) {
				setFont(tree.getFont().deriveFont(Font.BOLD));
			}
			else {
				setFont(null);
			}
			// ******************************************************************************* CHANGEMENT POLICE SI UN DES FILS EST SELECTIONNE
			component.revalidate();
			return component;
		}
 
	}
 
	private static class PathNodeTreeCellRenderer extends PathTreeCellRenderer {
 
		private static final long serialVersionUID = 1L;
		private JCheckBox checkBox = new JCheckBox();
		private JPanel panel;
		private int workAroundWidth;
		private int workAroundHeight;
 
		PathNodeTreeCellRenderer() {
			panel = new JPanel() {
				@Override
				public void reshape(int x, int y, int w, int h) {
					w=workAroundWidth;
					h=workAroundHeight;
					super.reshape(x, y, w, h);
				}
			};
			panel.setLayout(new FlowLayout(FlowLayout.LEADING, 0, 0));
			panel.setOpaque(false);
			checkBox.setOpaque(false);
			panel.add(checkBox);
			panel.add(this);
			panel.revalidate();
		}
 
		@Override
		public Component getTreeCellRendererComponent(JTree tree, Object value,
				boolean selected, boolean expanded, boolean leaf, int row,
				boolean hasFocus) {
			PathNode node = (PathNode) value;
			checkBox.setSelected(node.isChecked());
			Component comp = super.getTreeCellRendererComponent(tree,
					value, selected, expanded, leaf, row, hasFocus);
			panel.revalidate();
			Dimension dim = panel.getPreferredSize();
			workAroundWidth=dim.width;
			workAroundHeight=dim.height;
			return panel;
		}
 
	}
 
	private static class PathNodeCellEditor extends DefaultCellEditor {
 
		private static final long serialVersionUID = 1L;
		private PathNode node;
		private PathTreeCellRenderer cellRenderer = new PathTreeCellRenderer();
		private JPanel panel = new JPanel();
 
		public PathNodeCellEditor() {
			super(new JCheckBox());
			panel.setLayout(new FlowLayout(FlowLayout.LEADING, 0, 0));
			panel.setOpaque(false);
			JCheckBox checkBox = (JCheckBox) (super.getComponent());
			checkBox.setOpaque(false);
			panel.add(checkBox);
			panel.add(cellRenderer);
			panel.revalidate();
		}
 
		public Component getTreeCellEditorComponent(JTree tree,
				Object value, boolean selected, boolean expanded,
				boolean leaf, int row) {
			JCheckBox editor = null;
			node = (PathNode) value;
			if (node != null) {
				editor = (JCheckBox) (super.getComponent());
				editor.setSelected(node.isChecked());
			}
			cellRenderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, true);
			panel.revalidate();
			return panel;
		}
 
		public Object getCellEditorValue() {
			JCheckBox editor = (JCheckBox) (super.getComponent());
			node.setChecked(editor.isSelected());
			return node.getUserObject();
		}
 
	}
 
}