Example usage for javax.swing JTree setPreferredSize

Introduction

In this page you can find the example usage for javax.swing JTree setPreferredSize.

Prototype

@BeanProperty(preferred = true, description = "The preferred size of the component.")
public void setPreferredSize(Dimension preferredSize) 

Source Link

Document

Sets the preferred size of this component.

Usage

From source file:Main.java

public Main() {
    setLayout(new GridLayout(1, 3));
    tree = new JTree(getTreeModel());
    tree.setDragEnabled(true);//  ww  w . j a  v  a2 s.c o m
    tree.setPreferredSize(new Dimension(200, 400));
    JScrollPane scroll = new JScrollPane();
    scroll.setViewportView(tree);

    treeModel = getTreeModel();
    JTree secondTree = new JTree(treeModel);
    secondTree.setPreferredSize(new Dimension(200, 400));
    secondTree.setTransferHandler(new TransferHandler() {
        @Override
        public boolean importData(TransferSupport support) {
            if (!canImport(support)) {
                return false;
            }
            JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
            TreePath path = dl.getPath();
            int childIndex = dl.getChildIndex();

            String data;
            try {
                data = (String) support.getTransferable().getTransferData(DataFlavor.stringFlavor);
            } catch (Exception e) {
                return false;
            }
            if (childIndex == -1) {
                childIndex = tree.getModel().getChildCount(path.getLastPathComponent());
            }

            DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(data);
            DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) path.getLastPathComponent();
            treeModel.insertNodeInto(newNode, parentNode, childIndex);

            tree.makeVisible(path.pathByAddingChild(newNode));
            tree.scrollRectToVisible(tree.getPathBounds(path.pathByAddingChild(newNode)));
            return true;
        }

        public boolean canImport(TransferSupport support) {
            if (!support.isDrop()) {
                return false;
            }
            support.setShowDropLocation(true);
            if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                System.out.println("only string is supported");
                return false;
            }
            JTree.DropLocation dl = (JTree.DropLocation) support.getDropLocation();
            TreePath path = dl.getPath();
            if (path == null) {
                return false;
            }
            return true;
        }
    });
    JScrollPane secondScroll = new JScrollPane();
    secondScroll.setViewportView(secondTree);

    JPanel topPanel = new JPanel(new BorderLayout());
    topPanel.add(scroll, BorderLayout.CENTER);
    JPanel btmPanel = new JPanel(new BorderLayout());
    btmPanel.add(secondScroll, BorderLayout.CENTER);

    add(topPanel);
    add(btmPanel);
}

---