Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\behavior\TreeTableViewBehavior.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 static javafx.scene.input.KeyCode.*;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.WeakChangeListener;
import javafx.collections.ObservableList;
import javafx.geometry.NodeOrientation;
import javafx.scene.control.TableColumnBase;
import javafx.scene.control.TableFocusModel;
import javafx.scene.control.TablePositionBase;
import javafx.scene.control.TableSelectionModel;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTablePosition;
import javafx.scene.control.TreeTableView;
import javafx.scene.input.KeyEvent;
import javafx.util.Callback;

import java.util.ArrayList;
import java.util.List;

public class TreeTableViewBehavior<T> extends TableViewBehaviorBase<TreeTableView<T>, TreeItem<T>, TreeTableColumn<T, ?>> {

/**************************************************************************
     *                                                                        *
     * Setup key bindings                                                     *
     *                                                                        *
     *************************************************************************/

protected static final List<KeyBinding> TREE_TABLE_VIEW_BINDINGS = new ArrayList<KeyBinding>();

static {
        // Add these bindings at the front of the list, so they take precedence
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(LEFT, "CollapseRow"));
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(KP_LEFT, "CollapseRow"));
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(RIGHT, "ExpandRow"));
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(KP_RIGHT, "ExpandRow"));

TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(MULTIPLY, "ExpandAll"));
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(ADD, "ExpandRow"));
        TREE_TABLE_VIEW_BINDINGS.add(new KeyBinding(SUBTRACT, "CollapseRow"));

TREE_TABLE_VIEW_BINDINGS.addAll(TABLE_VIEW_BINDINGS);
    }

@Override protected /*final*/ String matchActionForEvent(KeyEvent e) {
        String action = super.matchActionForEvent(e);
        if (getControl().getEffectiveNodeOrientation() == NodeOrientation.RIGHT_TO_LEFT) {
            // Rather than switching the result of the action lookup in this way, the preferred
            // way to do this according to the current architecture would be to hoist the
            // getEffectiveNodeOrientation call up into the key bindings, the same way that ListView
            // orientation (horizontal vs. vertical) is handled with the OrientedKeyBinding class.
            if ("CollapseRow".equals(action) && (e.getCode() == LEFT || e.getCode() == KP_LEFT)) {
                action = "ExpandRow";
            } else if ("ExpandRow".equals(action) && (e.getCode() == RIGHT || e.getCode() == KP_RIGHT)) {
                action = "CollapseRow";
            }
        }
        return action;
    }

@Override protected void callAction(String name) {
        if ("ExpandRow".equals(name)) rightArrowPressed();
        else if ("CollapseRow".equals(name)) leftArrowPressed();
        else if ("ExpandAll".equals(name)) expandAll();
        else super.callAction(name);
    }

/**************************************************************************
     *                                                                        *
     * Listeners                                                              *
     *                                                                        *
     *************************************************************************/

private final ChangeListener<TreeTableView.TreeTableViewSelectionModel<T>> selectionModelListener =
            (observable, oldValue, newValue) -> {
                if (oldValue != null) {
                    oldValue.getSelectedCells().removeListener(weakSelectedCellsListener);
                }
                if (newValue != null) {
                    newValue.getSelectedCells().addListener(weakSelectedCellsListener);
                }
            };

private final WeakChangeListener<TreeTableView.TreeTableViewSelectionModel<T>> weakSelectionModelListener =
            new WeakChangeListener<TreeTableView.TreeTableViewSelectionModel<T>>(selectionModelListener);

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

public TreeTableViewBehavior(TreeTableView<T>  control) {
        super(control, TREE_TABLE_VIEW_BINDINGS);

// Fix for RT-16565
        control.selectionModelProperty().addListener(weakSelectionModelListener);
        if (getSelectionModel() != null) {
            control.getSelectionModel().getSelectedCells().addListener(selectedCellsListener);
        }
    }

/**************************************************************************
     *                                                                        *
     * Implement TableViewBehaviorBase abstract methods                       *
     *                                                                        *
     *************************************************************************/

/** {@inheritDoc}  */
    @Override protected int getItemCount() {
        return getControl().getExpandedItemCount();
    }

/** {@inheritDoc}  */
    @Override protected TableFocusModel getFocusModel() {
        return getControl().getFocusModel();
    }

/** {@inheritDoc}  */
    @Override protected TableSelectionModel<TreeItem<T>> getSelectionModel() {
        return getControl().getSelectionModel();
    }

/** {@inheritDoc}  */
    @Override protected ObservableList<TreeTablePosition<T,?>> getSelectedCells() {
        return getControl().getSelectionModel().getSelectedCells();
    }

/** {@inheritDoc}  */
    @Override protected TablePositionBase getFocusedCell() {
        return getControl().getFocusModel().getFocusedCell();
    }

/** {@inheritDoc}  */
    @Override protected int getVisibleLeafIndex(TableColumnBase tc) {
        return getControl().getVisibleLeafIndex((TreeTableColumn)tc);
    }

/** {@inheritDoc}  */
    @Override protected TreeTableColumn getVisibleLeafColumn(int index) {
        return getControl().getVisibleLeafColumn(index);
    }

/** {@inheritDoc}  */
    @Override protected void editCell(int row, TableColumnBase tc) {
        getControl().edit(row, (TreeTableColumn)tc);
    }

/** {@inheritDoc}  */
    @Override protected ObservableList<TreeTableColumn<T,?>> getVisibleLeafColumns() {
        return getControl().getVisibleLeafColumns();
    }

/** {@inheritDoc}  */
    @Override protected TablePositionBase<TreeTableColumn<T, ?>>
            getTablePosition(int row, TableColumnBase<TreeItem<T>, ?> tc) {
        return new TreeTablePosition(getControl(), row, (TreeTableColumn)tc);
    }

/**************************************************************************
     *                                                                        *
     * Modify TableViewBehaviorBase behavior                                  *
     *                                                                        *
     *************************************************************************/

/** {@inheritDoc} */
    @Override protected void selectAllToFocus(boolean setAnchorToFocusIndex) {
        // Fix for RT-31241
        if (getControl().getEditingCell() != null) return;

super.selectAllToFocus(setAnchorToFocusIndex);
    }

/**************************************************************************
     *                                                                        *
     * Tree-related implementation                                            *
     *                                                                        *
     *************************************************************************/

/**
     * The next methods handle the left/right arrow input differently depending
     * on whether we are in row or cell selection.
     */
    private void rightArrowPressed() {
        if (getControl().getSelectionModel().isCellSelectionEnabled()) {
            if (isRTL()) {
                selectLeftCell();
            } else {
                selectRightCell();
            }
        } else {
            expandRow();
        }
    }

private void leftArrowPressed() {
        if (getControl().getSelectionModel().isCellSelectionEnabled()) {
            if (isRTL()) {
                selectRightCell();
            } else {
                selectLeftCell();
            }
        } else {
            collapseRow();
        }
    }

private void expandRow() {
        Callback<TreeItem<T>, Integer> getIndex = p -> getControl().getRow(p);
        TreeViewBehavior.expandRow(getControl().getSelectionModel(), getIndex);
    }

private void expandAll() {
        TreeViewBehavior.expandAll(getControl().getRoot());
    }

private void collapseRow() {
        TreeTableView<T> control = getControl();
        TreeViewBehavior.collapseRow(control.getSelectionModel(), control.getRoot(), control.isShowRoot());
    }
}

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