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

/*
 * Copyright (c) 2010, 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.skin;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;

import javafx.beans.property.DoubleProperty;
import javafx.beans.value.WritableValue;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.css.StyleableDoubleProperty;
import javafx.css.StyleableProperty;
import javafx.css.CssMetaData;

import com.sun.javafx.css.converters.SizeConverter;
import com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler;
import com.sun.javafx.scene.control.behavior.TreeCellBehavior;

import javafx.css.Styleable;

public class TreeCellSkin<T> extends CellSkinBase<TreeCell<T>, TreeCellBehavior<T>> {

/*
     * This is rather hacky - but it is a quick workaround to resolve the
     * issue that we don't know maximum width of a disclosure node for a given
     * TreeView. If we don't know the maximum width, we have no way to ensure
     * consistent indentation for a given TreeView.
     *
     * To work around this, we create a single WeakHashMap to store a max
     * disclosureNode width per TreeView. We use WeakHashMap to help prevent
     * any memory leaks.
     *
     * RT-19656 identifies a related issue, which is that we may not provide
     * indentation to any TreeItems because we have not yet encountered a cell
     * which has a disclosureNode. Once we scroll and encounter one, indentation
     * happens in a displeasing way.
     */
    private static final Map<TreeView<?>, Double> maxDisclosureWidthMap = new WeakHashMap<TreeView<?>, Double>();

/**
     * The amount of space to multiply by the treeItem.level to get the left
     * margin for this tree cell. This is settable from CSS
     */
    private DoubleProperty indent = null;
    public final void setIndent(double value) { indentProperty().set(value); }
    public final double getIndent() { return indent == null ? 10.0 : indent.get(); }
    public final DoubleProperty indentProperty() {
        if (indent == null) {
            indent = new StyleableDoubleProperty(10.0) {
                @Override public Object getBean() {
                    return TreeCellSkin.this;
                }

@Override public String getName() {
                    return "indent";
                }

@Override public CssMetaData<TreeCell<?>,Number> getCssMetaData() {
                    return StyleableProperties.INDENT;
                }
            };
        }
        return indent;
    }

private boolean disclosureNodeDirty = true;
    private TreeItem<?> treeItem;

private double fixedCellSize;
    private boolean fixedCellSizeEnabled;

private MultiplePropertyChangeListenerHandler treeItemListener = new MultiplePropertyChangeListenerHandler(p -> {
        if ("EXPANDED".equals(p)) {
            updateDisclosureNodeRotation(true);
        }
        return null;
    });

public TreeCellSkin(TreeCell<T> control) {
        super(control, new TreeCellBehavior<T>(control));

this.fixedCellSize = control.getTreeView().getFixedCellSize();
        this.fixedCellSizeEnabled = fixedCellSize > 0;

updateTreeItem();
        updateDisclosureNodeRotation(false);

registerChangeListener(control.treeItemProperty(), "TREE_ITEM");
        registerChangeListener(control.textProperty(), "TEXT");
        registerChangeListener(control.getTreeView().fixedCellSizeProperty(), "FIXED_CELL_SIZE");
    }

@Override protected void handleControlPropertyChanged(String p) {
        super.handleControlPropertyChanged(p);
        if ("TREE_ITEM".equals(p)) {
            updateTreeItem();
            disclosureNodeDirty = true;
            getSkinnable().requestLayout();
        } else if ("TEXT".equals(p)) {
            getSkinnable().requestLayout();
        } else if ("FIXED_CELL_SIZE".equals(p)) {
            this.fixedCellSize = getSkinnable().getTreeView().getFixedCellSize();
            this.fixedCellSizeEnabled = fixedCellSize > 0;
        }
    }

private void updateDisclosureNodeRotation(boolean animate) {
        // no-op, this is now handled in CSS (although we no longer animate)
//        if (treeItem == null || treeItem.isLeaf()) return;
//
//        Node disclosureNode = getSkinnable().getDisclosureNode();
//        if (disclosureNode == null) return;
//
//        final boolean isExpanded = treeItem.isExpanded();
//        int fromAngle = isExpanded ? 0 : 90;
//        int toAngle = isExpanded ? 90 : 0;
//
//        if (animate) {
//            RotateTransition rt = new RotateTransition(Duration.millis(200), disclosureNode);
//            rt.setFromAngle(fromAngle);
//            rt.setToAngle(toAngle);
//            rt.play();
//        } else {
//            disclosureNode.setRotate(toAngle);
//        }
    }

private void updateTreeItem() {
        if (treeItem != null) {
            treeItemListener.unregisterChangeListener(treeItem.expandedProperty());
        }
        treeItem = getSkinnable().getTreeItem();
        if (treeItem != null) {
            treeItemListener.registerChangeListener(treeItem.expandedProperty(), "EXPANDED");
        }

updateDisclosureNodeRotation(false);
    }

private void updateDisclosureNode() {
        if (getSkinnable().isEmpty()) return;

Node disclosureNode = getSkinnable().getDisclosureNode();
        if (disclosureNode == null) return;

boolean disclosureVisible = treeItem != null && ! treeItem.isLeaf();
        disclosureNode.setVisible(disclosureVisible);

if (! disclosureVisible) {
            getChildren().remove(disclosureNode);
        } else if (disclosureNode.getParent() == null) {
            getChildren().add(disclosureNode);
            disclosureNode.toFront();
        } else {
            disclosureNode.toBack();
        }

// RT-26625: [TreeView, TreeTableView] can lose arrows while scrolling
        // RT-28668: Ensemble tree arrow disappears
        if (disclosureNode.getScene() != null) {
            disclosureNode.applyCss();
        }
    }

@Override protected void updateChildren() {
        super.updateChildren();
        updateDisclosureNode();
    }

@Override protected void layoutChildren(double x, final double y,
            double w, final double h) {
        // RT-25876: can not null-check here as this prevents empty rows from
        // being cleaned out.
        // if (treeItem == null) return;

TreeView<T> tree = getSkinnable().getTreeView();
        if (tree == null) return;

if (disclosureNodeDirty) {
            updateDisclosureNode();
            disclosureNodeDirty = false;
        }

Node disclosureNode = getSkinnable().getDisclosureNode();

int level = tree.getTreeItemLevel(treeItem);
        if (! tree.isShowRoot()) level--;
        double leftMargin = getIndent() * level;

x += leftMargin;

// position the disclosure node so that it is at the proper indent
        boolean disclosureVisible = disclosureNode != null && treeItem != null && ! treeItem.isLeaf();

final double defaultDisclosureWidth = maxDisclosureWidthMap.containsKey(tree) ?
            maxDisclosureWidthMap.get(tree) : 18;   // RT-19656: default width of default disclosure node
        double disclosureWidth = defaultDisclosureWidth;

if (disclosureVisible) {
            if (disclosureNode == null || disclosureNode.getScene() == null) {
                updateChildren();
            }

if (disclosureNode != null) {
                disclosureWidth = disclosureNode.prefWidth(h);
                if (disclosureWidth > defaultDisclosureWidth) {
                    maxDisclosureWidthMap.put(tree, disclosureWidth);
                }

double ph = disclosureNode.prefHeight(disclosureWidth);

disclosureNode.resize(disclosureWidth, ph);
                positionInArea(disclosureNode, x, y,
                        disclosureWidth, ph, /*baseline ignored*/0,
                        HPos.CENTER, VPos.CENTER);
            }
        }

// determine starting point of the graphic or cell node, and the
        // remaining width available to them
        final int padding = treeItem != null && treeItem.getGraphic() == null ? 0 : 3;
        x += disclosureWidth + padding;
        w -= (leftMargin + disclosureWidth + padding);

// Rather ugly fix for RT-38519, where graphics are disappearing in
        // certain circumstances
        Node graphic = getSkinnable().getGraphic();
        if (graphic != null && !getChildren().contains(graphic)) {
            getChildren().add(graphic);
        }

layoutLabelInArea(x, y, w, h);
    }

@Override protected double computeMinHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (fixedCellSizeEnabled) {
            return fixedCellSize;
        }

double pref = super.computeMinHeight(width, topInset, rightInset, bottomInset, leftInset);
        Node d = getSkinnable().getDisclosureNode();
        return (d == null) ? pref : Math.max(d.minHeight(-1), pref);
    }

@Override protected double computePrefHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (fixedCellSizeEnabled) {
            return fixedCellSize;
        }

final TreeCell<T> cell = getSkinnable();

final double pref = super.computePrefHeight(width, topInset, rightInset, bottomInset, leftInset);
        final Node d = cell.getDisclosureNode();
        final double prefHeight = (d == null) ? pref : Math.max(d.prefHeight(-1), pref);

// RT-30212: TreeCell does not honor minSize of cells.
        // snapSize for RT-36460
        return snapSize(Math.max(cell.getMinHeight(), prefHeight));
    }

@Override protected double computeMaxHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (fixedCellSizeEnabled) {
            return fixedCellSize;
        }

return super.computeMaxHeight(width, topInset, rightInset, bottomInset, leftInset);
    }

@Override protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        double labelWidth = super.computePrefWidth(height, topInset, rightInset, bottomInset, leftInset);

double pw = snappedLeftInset() + snappedRightInset();

TreeView<T> tree = getSkinnable().getTreeView();
        if (tree == null) return pw;

if (treeItem == null) return pw;

pw = labelWidth;

// determine the amount of indentation
        int level = tree.getTreeItemLevel(treeItem);
        if (! tree.isShowRoot()) level--;
        pw += getIndent() * level;

// include the disclosure node width
        Node disclosureNode = getSkinnable().getDisclosureNode();
        double disclosureNodePrefWidth = disclosureNode == null ? 0 : disclosureNode.prefWidth(-1);
        final double defaultDisclosureWidth = maxDisclosureWidthMap.containsKey(tree) ?
                maxDisclosureWidthMap.get(tree) : 0;
        pw += Math.max(defaultDisclosureWidth, disclosureNodePrefWidth);

return pw;
    }

/***************************************************************************
     *                                                                         *
     *                         Stylesheet Handling                             *
     *                                                                         *
     **************************************************************************/

/** @treatAsPrivate */
    private static class StyleableProperties {

private static final CssMetaData<TreeCell<?>,Number> INDENT =
            new CssMetaData<TreeCell<?>,Number>("-fx-indent",
                SizeConverter.getInstance(), 10.0) {

@Override public boolean isSettable(TreeCell<?> n) {
                DoubleProperty p = ((TreeCellSkin<?>) n.getSkin()).indentProperty();
                return p == null || !p.isBound();
            }

@Override public StyleableProperty<Number> getStyleableProperty(TreeCell<?> n) {
                final TreeCellSkin<?> skin = (TreeCellSkin<?>) n.getSkin();
                return (StyleableProperty<Number>)(WritableValue<Number>)skin.indentProperty();
            }
        };

private static final List<CssMetaData<? extends Styleable, ?>> STYLEABLES;
        static {
            final List<CssMetaData<? extends Styleable, ?>> styleables =
                new ArrayList<CssMetaData<? extends Styleable, ?>>(CellSkinBase.getClassCssMetaData());
            styleables.add(INDENT);
            STYLEABLES = Collections.unmodifiableList(styleables);
        }
    }

/**
     * @return The CssMetaData associated with this class, which may include the
     * CssMetaData of its super classes.
     */
    public static List<CssMetaData<? extends Styleable, ?>> getClassCssMetaData() {
        return StyleableProperties.STYLEABLES;
    }

/**
     * {@inheritDoc}
     */
    @Override
    public List<CssMetaData<? extends Styleable, ?>> getCssMetaData() {
        return getClassCssMetaData();
    }
}

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