Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\behavior\TreeTableRowBehavior.java

/*
 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package com.sun.javafx.scene.control.behavior;

import javafx.collections.ObservableList;
import javafx.scene.control.TableFocusModel;
import javafx.scene.control.TablePositionBase;
import javafx.scene.control.TableSelectionModel;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableRow;
import javafx.scene.control.TreeTableView;
import javafx.scene.input.MouseButton;

public class TreeTableRowBehavior<T> extends TableRowBehaviorBase<TreeTableRow<T>> {

/***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

public TreeTableRowBehavior(TreeTableRow<T> control) {
        super(control);
    }

/***************************************************************************
     *                                                                         *
     * Public API                                                              *
     *                                                                         *
     **************************************************************************/

@Override protected TableSelectionModel<TreeItem<T>> getSelectionModel() {
        return getCellContainer().getSelectionModel();
    }

@Override protected TableFocusModel<TreeItem<T>,?> getFocusModel() {
        return getCellContainer().getFocusModel();
    }

@Override protected TreeTableView<T> getCellContainer() {
        return getControl().getTreeTableView();
    }

@Override protected TablePositionBase<?> getFocusedCell() {
        return getCellContainer().getFocusModel().getFocusedCell();
    }

@Override protected ObservableList getVisibleLeafColumns() {
        return getCellContainer().getVisibleLeafColumns();
    }

@Override protected void edit(TreeTableRow<T> cell) {
        // no-op (for now)
    }

@Override
    protected void handleClicks(MouseButton button, int clickCount, boolean isAlreadySelected) {
        // handle editing, which only occurs with the primary mouse button
        TreeItem<T> treeItem = getControl().getTreeItem();
        if (button == MouseButton.PRIMARY) {
            if (clickCount == 1 && isAlreadySelected) {
                edit(getControl());
            } else if (clickCount == 1) {
                // cancel editing
                edit(null);
            } else if (clickCount == 2 && treeItem.isLeaf()) {
                // attempt to edit
                edit(getControl());
            } else if (clickCount % 2 == 0) {
                // try to expand/collapse branch tree item
                treeItem.setExpanded(! treeItem.isExpanded());
            }
        }
    }
}

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