DNDTree.java

/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.google.security.zynamics.zylib.gui.dndtree;

import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;

import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeSelectionModel;

public class DNDTree extends JTree {
  private static final long serialVersionUID = -2933192344665054732L;

  Insets autoscrollInsets = new Insets(20, 20, 20, 20); // insets

  public DNDTree() {
    super();

    setAutoscrolls(true);
    setRootVisible(false);
    setShowsRootHandles(false);// to show the root icon
    getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); // set single
                                                                                    // selection for
                                                                                    // the Tree
    setEditable(false);
  }

  public static DefaultMutableTreeNode makeDeepCopy(final DefaultMutableTreeNode node) {
    final DefaultMutableTreeNode copy = new DefaultMutableTreeNode(node.getUserObject());
    for (final Enumeration<?> e = node.children(); e.hasMoreElements();) {
      copy.add(makeDeepCopy((DefaultMutableTreeNode) e.nextElement()));
    }
    return copy;
  }

  public void autoscroll(final Point cursorLocation) {
    final Insets insets = getAutoscrollInsets();
    final Rectangle outer = getVisibleRect();
    final Rectangle inner =
        new Rectangle(outer.x + insets.left, outer.y + insets.top, outer.width
            - (insets.left + insets.right), outer.height - (insets.top + insets.bottom));
    if (!inner.contains(cursorLocation)) {
      final Rectangle scrollRect =
          new Rectangle(cursorLocation.x - insets.left, cursorLocation.y - insets.top, insets.left
              + insets.right, insets.top + insets.bottom);
      scrollRectToVisible(scrollRect);
    }
  }

  public Insets getAutoscrollInsets() {
    return autoscrollInsets;
  }
}