Method dropLocationForPoint

unused/javax/swing/JTree.java:1302–1395

Calculates a drop location in this component, representing where a drop at the given point should insert data. @param p the point to calculate a drop location for @return the drop location, or null

(Point p)

     * @return the drop location, or <code>null</code>
     */
    DropLocation dropLocationForPoint(Point p) {
        DropLocation location = null;

        int row = getClosestRowForLocation(p.x, p.y);
        Rectangle bounds = getRowBounds(row);
        TreeModel model = getModel();
        Object root = (model == null) ? null : model.getRoot();
        TreePath rootPath = (root == null) ? null : new TreePath(root);

        TreePath child;
        TreePath parent;
        boolean outside = row == -1
                          || p.y < bounds.y
                          || p.y >= bounds.y + bounds.height;

        switch(dropMode) {
            case USE_SELECTION:
            case ON:
                if (outside) {
                    location = new DropLocation(p, null, -1);
                } else {
                    location = new DropLocation(p, getPathForRow(row), -1);
                }

                break;
            case INSERT:
            case ON_OR_INSERT:
                if (row == -1) {
                    if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
                        location = new DropLocation(p, rootPath, 0);
                    } else {
                        location = new DropLocation(p, null, -1);
                    }

                    break;
                }

                boolean checkOn = dropMode == DropMode.ON_OR_INSERT
                                  || !model.isLeaf(getPathForRow(row).getLastPathComponent());

                Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
                if(section == LEADING) {
                    child = getPathForRow(row);
                    parent = child.getParentPath();
                } else if (section == TRAILING) {
                    int index = row + 1;
                    if (index >= getRowCount()) {
                        if (model.isLeaf(root) || !isExpanded(rootPath)) {
                            location = new DropLocation(p, null, -1);
                        } else {
                            parent = rootPath;
                            index = model.getChildCount(root);
                            location = new DropLocation(p, parent, index);
                        }

                        break;
                    }