Examples with ExpandVetoException javax.swing.tree.ExpandVetoException used on opensource projects

Example 6 with ExpandVetoException

use of javax.swing.tree.ExpandVetoException in project java-swing-tips by aterai.

the class EmptyIcon method updateUI.

@Override
public void updateUI() {
    setCellRenderer(null);
    removeTreeWillExpandListener(listener);
    super.updateUI();
    setUI(new BasicTreeUI() {

        @Override
        public Rectangle getPathBounds(JTree tree, TreePath path) {
            if (Objects.nonNull(tree) && Objects.nonNull(treeState)) {
                return getTreePathBounds(path, tree.getInsets(), new Rectangle());
            }
            return null;
        }

        private Rectangle getTreePathBounds(TreePath path, Insets insets, Rectangle bounds) {
            Rectangle rect = treeState.getBounds(path, bounds);
            if (Objects.nonNull(rect)) {
                rect.width = tree.getWidth();
                rect.y += insets.top;
            }
            return rect;
        }
    });
    UIManager.put("Tree.repaintWholeRow", Boolean.TRUE);
    TreeCellRenderer r = getCellRenderer();
    setCellRenderer((tree, value, selected, expanded, leaf, row, hasFocus) -> {
        Component c = r.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
        c.setBackground(selected ? SELECTED_COLOR : tree.getBackground());
        if (c instanceof JComponent) {
            ((JComponent) c).setOpaque(true);
        }
        return c;
    });
    setOpaque(false);
    setRootVisible(false);
    // https://ateraimemo.com/Swing/TreeNodeCollapseVeto.html
    listener = new TreeWillExpandListener() {

        @Override
        public void treeWillExpand(TreeExpansionEvent e) {
        // throw new ExpandVetoException(e, "Tree expansion cancelled");
        }

        @Override
        public void treeWillCollapse(TreeExpansionEvent e) throws ExpandVetoException {
            throw new ExpandVetoException(e, "Tree collapse cancelled");
        }
    };
    addTreeWillExpandListener(listener);
}

Example 7 with ExpandVetoException

use of javax.swing.tree.ExpandVetoException in project java-swing-tips by aterai.

the class BackgroundTask method treeWillExpand.

@Override
public void treeWillExpand(TreeExpansionEvent e) throws ExpandVetoException {
    TreePath path = e.getPath();
    Object o = path.getLastPathComponent();
    if (o instanceof DefaultMutableTreeNode) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) o;
        File file = (File) node.getUserObject();
        String name = file.getName();
        // System.out.println(name);
        if (!name.isEmpty() && name.codePointAt(0) == '.') {
            throw new ExpandVetoException(e, "Tree expansion cancelled");
        }
    }
}