/*
 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javafx.scene.text;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.NodeOrientation;
import javafx.geometry.Orientation;
import javafx.geometry.VPos;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
import javafx.scene.Node;
import javafx.scene.layout.Pane;
import javafx.scene.shape.PathElement;
import javafx.css.StyleableDoubleProperty;
import javafx.css.StyleableObjectProperty;
import javafx.css.CssMetaData;
import javafx.css.converter.EnumConverter;
import javafx.css.converter.SizeConverter;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.Point2D;
import com.sun.javafx.geom.RectBounds;
import com.sun.javafx.scene.text.GlyphList;
import com.sun.javafx.scene.text.TextLayout;
import com.sun.javafx.scene.text.TextLayoutFactory;
import com.sun.javafx.scene.text.TextSpan;
import com.sun.javafx.tk.Toolkit;
import javafx.css.Styleable;
import javafx.css.StyleableProperty;

TextFlow is special layout designed to lay out rich text. It can be used to layout several Text nodes in a single text flow. The TextFlow uses the text and the font of each Text node inside of it plus it own width and text alignment to determine the location for each child. A single Text node can span over several lines due to wrapping and the visual location of Text node can differ from the logical location due to bidi reordering. 

Any other Node, rather than Text, will be treated as embedded object in the
text layout. It will be inserted in the content using its preferred width,
height, and baseline offset.
 When a Text node is inside of a TextFlow some its properties are ignored. For example, the x and y properties of the Text node are ignored since the location of the node is determined by the parent. Likewise, the wrapping width in the Text node is ignored since the width used for wrapping is the TextFlow's width. The value of the pickOnBounds property of a Text is set to false when it is laid out by the TextFlow. This happens because the content of a single Text node can divided and placed in the different locations on the TextFlow (usually due to line breaking and bidi reordering). 

The wrapping width of the layout is determined by the region's current width.
It can be specified by the application by setting the textflow's preferred
width. If no wrapping is desired, the application can either set the preferred
with to Double.MAX_VALUE or Region.USE_COMPUTED_SIZE.
 Paragraphs are separated by '\n' present in any Text child. 

Example of a TextFlow:

    Text text1 = new Text("Big italic red text");
    text1.setFill(Color.RED);
    text1.setFont(Font.font("Helvetica", FontPosture.ITALIC, 40));
    Text text2 = new Text(" little bold blue text");
    text2.setFill(Color.BLUE);
    text2.setFont(Font.font("Helvetica", FontWeight.BOLD, 10));
    TextFlow textFlow = new TextFlow(text1, text2);


TextFlow lays out each managed child regardless of the child's visible property value;
unmanaged children are ignored for all layout calculations.
 TextFlow may be styled with backgrounds and borders using CSS. See Region superclass for details.
Resizable Range

A textflow's parent will resize the textflow within the textflow's range
during layout. By default the textflow computes this range based on its content
as outlined in the tables below.


TextFlow Resize Table
width
height
minimum
left/right insets
top/bottom insets plus the height of the text content
preferred
left/right insets plus the width of the text content
top/bottom insets plus the height of the text content
maximum
Double.MAX_VALUE
Double.MAX_VALUE


A textflow's unbounded maximum width and height are an indication to the parent that
it may be resized beyond its preferred size to fill whatever space is assigned to it.

TextFlow provides properties for setting the size range directly.  These
properties default to the sentinel value Region.USE_COMPUTED_SIZE, however the
application may set them to other values as needed:

    textflow.setMaxWidth(500);

Applications may restore the computed values by setting these properties back
to Region.USE_COMPUTED_SIZE.

TextFlow does not clip its content by default, so it is possible that childrens'
bounds may extend outside its own bounds if a child's pref size is larger than
the space textflow has to allocate for it.
Since:
JavaFX 8.0/**
 * TextFlow is special layout designed to lay out rich text.
 * It can be used to layout several {@link Text} nodes in a single text flow.
 * The TextFlow uses the text and the font of each {@link Text} node inside of it
 * plus it own width and text alignment to determine the location for each child.
 * A single {@link Text} node can span over several lines due to wrapping and
 * the visual location of {@link Text} node can differ from the logical location
 * due to bidi reordering.
 *
 * <p>
 * Any other Node, rather than Text, will be treated as embedded object in the
 * text layout. It will be inserted in the content using its preferred width,
 * height, and baseline offset.
 *
 * <p>
 * When a {@link Text} node is inside of a TextFlow some its properties are ignored.
 * For example, the x and y properties of the {@link Text} node are ignored since
 * the location of the node is determined by the parent. Likewise, the wrapping
 * width in the {@link Text} node is ignored since the width used for wrapping
 * is the TextFlow's width. The value of the <code>pickOnBounds</code> property
 * of a {@link Text} is set to <code>false</code> when it is laid out by the
 * TextFlow. This happens because the content of a single {@link Text} node can
 * divided and placed in the different locations on the TextFlow (usually due to
 * line breaking and bidi reordering).
 *
 * <p>
 * The wrapping width of the layout is determined by the region's current width.
 * It can be specified by the application by setting the textflow's preferred
 * width. If no wrapping is desired, the application can either set the preferred
 * with to Double.MAX_VALUE or Region.USE_COMPUTED_SIZE.
 *
 * <p>
 * Paragraphs are separated by {@code '\n'} present in any Text child.
 *
 * <p>
 * Example of a TextFlow:
 * <pre>{@code
 *     Text text1 = new Text("Big italic red text");
 *     text1.setFill(Color.RED);
 *     text1.setFont(Font.font("Helvetica", FontPosture.ITALIC, 40));
 *     Text text2 = new Text(" little bold blue text");
 *     text2.setFill(Color.BLUE);
 *     text2.setFont(Font.font("Helvetica", FontWeight.BOLD, 10));
 *     TextFlow textFlow = new TextFlow(text1, text2);
 * }</pre>
 *
 * <p>
 * TextFlow lays out each managed child regardless of the child's visible property value;
 * unmanaged children are ignored for all layout calculations.</p>
 *
 * <p>
 * TextFlow may be styled with backgrounds and borders using CSS.  See
 * {@link javafx.scene.layout.Region Region} superclass for details.</p>
 *
 * <h3>Resizable Range</h3>
 *
 * <p>
 * A textflow's parent will resize the textflow within the textflow's range
 * during layout. By default the textflow computes this range based on its content
 * as outlined in the tables below.
 * </p>
 *
 * <table border="1">
 * <caption>TextFlow Resize Table</caption>
 * <tr><td></td><th scope="col">width</th><th scope="col">height</th></tr>
 * <tr><th scope="row">minimum</th>
 * <td>left/right insets</td>
 * <td>top/bottom insets plus the height of the text content</td></tr>
 * <tr><th scope="row">preferred</th>
 * <td>left/right insets plus the width of the text content</td>
 * <td>top/bottom insets plus the height of the text content</td></tr>
 * <tr><th scope="row">maximum</th>
 * <td>Double.MAX_VALUE</td><td>Double.MAX_VALUE</td></tr>
 * </table>
 * <p>
 * A textflow's unbounded maximum width and height are an indication to the parent that
 * it may be resized beyond its preferred size to fill whatever space is assigned to it.
 * <p>
 * TextFlow provides properties for setting the size range directly.  These
 * properties default to the sentinel value Region.USE_COMPUTED_SIZE, however the
 * application may set them to other values as needed:
 * <pre><code>
 *     <b>textflow.setMaxWidth(500);</b>
 * </code></pre>
 * Applications may restore the computed values by setting these properties back
 * to Region.USE_COMPUTED_SIZE.
 * <p>
 * TextFlow does not clip its content by default, so it is possible that childrens'
 * bounds may extend outside its own bounds if a child's pref size is larger than
 * the space textflow has to allocate for it.</p>
 *
 * @since JavaFX 8.0
 */
public class TextFlow extends Pane {

    private TextLayout layout;
    private boolean needsContent;
    private boolean inLayout;

    
Creates an empty TextFlow layout.
/**
     * Creates an empty TextFlow layout.
     */
    public TextFlow() {
        super();
        effectiveNodeOrientationProperty().addListener(observable -> checkOrientation());
        setAccessibleRole(AccessibleRole.TEXT);
    }

    
Creates a TextFlow layout with the given children.
Params:
children – children./**
     * Creates a TextFlow layout with the given children.
     *
     * @param children children.
     */
    public TextFlow(Node... children) {
        this();
        getChildren().addAll(children);
    }

    private void checkOrientation() {
        NodeOrientation orientation = getEffectiveNodeOrientation();
        boolean rtl =  orientation == NodeOrientation.RIGHT_TO_LEFT;
        int dir = rtl ? TextLayout.DIRECTION_RTL : TextLayout.DIRECTION_LTR;
        TextLayout layout = getTextLayout();
        if (layout.setDirection(dir)) {
            requestLayout();
        }
    }

    
Maps local point to index in the content.
Params:
point – the specified point to be tested
Returns:
a HitInfo representing the character index found
Since:
9/**
     * Maps local point to index in the content.
     *
     * @param point the specified point to be tested
     * @return a {@code HitInfo} representing the character index found
     * @since 9
     */
    public final HitInfo hitTest(javafx.geometry.Point2D point) {
        if (point != null) {
            TextLayout layout = getTextLayout();
            double x = point.getX()/* - getX()*/;
            double y = point.getY()/* - getY()/* + getYRendering()*/;
            TextLayout.Hit layoutHit = layout.getHitInfo((float)x, (float)y);
            return new HitInfo(layoutHit.getCharIndex(), layoutHit.getInsertionIndex(),
                               layoutHit.isLeading(), null/*getText()*/);
        } else {
            return null;
        }
    }

    
Returns shape of caret in local coordinates.
Params:
charIndex – the character index for the caret
leading – whether the caret is biased on the leading edge of the character
Returns:
an array of PathElement which can be used to create a Shape
Since:
9/**
     * Returns shape of caret in local coordinates.
     *
     * @param charIndex the character index for the caret
     * @param leading whether the caret is biased on the leading edge of the character
     * @return an array of {@code PathElement} which can be used to create a {@code Shape}
     * @since 9
     */
    public PathElement[] caretShape(int charIndex, boolean leading) {
        return getTextLayout().getCaretShape(charIndex, leading, 0, 0);
    }

    
Returns shape for the range of the text in local coordinates.
Params:
start – the beginning character index for the range
end – the end character index (non-inclusive) for the range
Returns:
an array of PathElement which can be used to create a Shape
Since:
9/**
     * Returns shape for the range of the text in local coordinates.
     *
     * @param start the beginning character index for the range
     * @param end the end character index (non-inclusive) for the range
     * @return an array of {@code PathElement} which can be used to create a {@code Shape}
     * @since 9
     */
    public final PathElement[] rangeShape(int start, int end) {
        return getRange(start, end, TextLayout.TYPE_TEXT);
    }

    @Override
    public boolean usesMirroring() {
        return false;
    }

    @Override protected void setWidth(double value) {
        if (value != getWidth()) {
            TextLayout layout = getTextLayout();
            Insets insets = getInsets();
            double left = snapSpaceX(insets.getLeft());
            double right = snapSpaceX(insets.getRight());
            double width = Math.max(1, value - left - right);
            layout.setWrapWidth((float)width);
            super.setWidth(value);
        }
    }

    @Override protected double computePrefWidth(double height) {
        TextLayout layout = getTextLayout();
        layout.setWrapWidth(0);
        double width = layout.getBounds().getWidth();
        Insets insets = getInsets();
        double left = snapSpaceX(insets.getLeft());
        double right = snapSpaceX(insets.getRight());
        double wrappingWidth = Math.max(1, getWidth() - left - right);
        layout.setWrapWidth((float)wrappingWidth);
        return left + width + right;
    }

    @Override protected double computePrefHeight(double width) {
        TextLayout layout = getTextLayout();
        Insets insets = getInsets();
        double left = snapSpaceX(insets.getLeft());
        double right = snapSpaceX(insets.getRight());
        if (width == USE_COMPUTED_SIZE) {
            layout.setWrapWidth(0);
        } else {
            double wrappingWidth = Math.max(1, width - left - right);
            layout.setWrapWidth((float)wrappingWidth);
        }
        double height = layout.getBounds().getHeight();
        double wrappingWidth = Math.max(1, getWidth() - left - right);
        layout.setWrapWidth((float)wrappingWidth);
        double top = snapSpaceY(insets.getTop());
        double bottom = snapSpaceY(insets.getBottom());
        return top + height + bottom;
    }

    @Override protected double computeMinHeight(double width) {
        return computePrefHeight(width);
    }

    @Override public void requestLayout() {
        /* The geometry of text nodes can be changed during layout children.
         * For that reason it has to call NodeHelper.geomChanged(this) causing
         * requestLayout() to happen during layoutChildren().
         * The inLayout flag prevents this call to cause any extra work.
         */
        if (inLayout) return;

        /*
        * There is no need to reset the text layout's content every time
        * requestLayout() is called. For example, the content needs
        * to be set when:
        *  children add or removed
        *  children managed state changes
        *  children geomChanged (width/height of embedded node)
        *  children content changes (text/font of text node)
        * The content does not need to set when:
        *  the width/height changes in the region
        *  the insets changes in the region
        *
        * Unfortunately, it is not possible to know what change invoked request
        * layout. The solution is to always reset the content in the text
        * layout and rely on it to preserve itself if the new content equals to
        * the old one. The cost to generate the new content is not avoid.
        */
        needsContent = true;
        super.requestLayout();
    }

    @Override public Orientation getContentBias() {
        return Orientation.HORIZONTAL;
    }

    @Override protected void layoutChildren() {
        inLayout = true;
        Insets insets = getInsets();
        double top = snapSpaceY(insets.getTop());
        double left = snapSpaceX(insets.getLeft());

        GlyphList[] runs = getTextLayout().getRuns();
        for (int j = 0; j < runs.length; j++) {
            GlyphList run = runs[j];
            TextSpan span = run.getTextSpan();
            if (span instanceof EmbeddedSpan) {
                Node child = ((EmbeddedSpan)span).getNode();
                Point2D location = run.getLocation();
                double baselineOffset = -run.getLineBounds().getMinY();

                layoutInArea(child, left + location.x, top + location.y,
                             run.getWidth(), run.getHeight(),
                             baselineOffset, null, true, true,
                             HPos.CENTER, VPos.BASELINE);
            }
        }

        List<Node> managed = getManagedChildren();
        for (Node node: managed) {
            if (node instanceof Text) {
                Text text = (Text)node;
                text.layoutSpan(runs);
                BaseBounds spanBounds = text.getSpanBounds();
                text.relocate(left + spanBounds.getMinX(),
                              top + spanBounds.getMinY());
            }
        }
        inLayout = false;
    }

    private PathElement[] getRange(int start, int end, int type) {
        TextLayout layout = getTextLayout();
        return layout.getRange(start, end, type, 0, 0);
    }

    private static class EmbeddedSpan implements TextSpan {
        RectBounds bounds;
        Node node;
        public EmbeddedSpan(Node node, double baseline, double width, double height) {
            this.node = node;
            bounds = new RectBounds(0, (float)-baseline,
                                    (float)width, (float)(height - baseline));
        }

        @Override public String getText() {
            return "\uFFFC";
        }

        @Override public Object getFont() {
            return null;
        }

        @Override public RectBounds getBounds() {
            return bounds;
        }

        public Node getNode() {
            return node;
        }
    }

    TextLayout getTextLayout() {
        if (layout == null) {
            TextLayoutFactory factory = Toolkit.getToolkit().getTextLayoutFactory();
            layout = factory.createLayout();
            needsContent = true;
        }
        if (needsContent) {
            List<Node> children = getManagedChildren();
            TextSpan[] spans = new TextSpan[children.size()];
            for (int i = 0; i < spans.length; i++) {
                Node node = children.get(i);
                if (node instanceof Text) {
                    spans[i] = ((Text)node).getTextSpan();
                } else {
                    /* Creating a text span every time forces text layout
                     * to run a full text analysis in the new content.
                     */
                    double baseline = node.getBaselineOffset();
                    if (baseline == BASELINE_OFFSET_SAME_AS_HEIGHT) {
                        baseline = node.getLayoutBounds().getHeight();
                    }
                    double width = computeChildPrefAreaWidth(node, null);
                    double height = computeChildPrefAreaHeight(node, null);
                    spans[i] = new EmbeddedSpan(node, baseline, width, height);
                }
            }
            layout.setContent(spans);
            needsContent = false;
        }
        return layout;
    }

    
Defines horizontal text alignment.
@defaultValue
TextAlignment.LEFT/**
     * Defines horizontal text alignment.
     *
     * @defaultValue TextAlignment.LEFT
     */
    private ObjectProperty<TextAlignment> textAlignment;

    public final void setTextAlignment(TextAlignment value) {
        textAlignmentProperty().set(value);
    }

    public final TextAlignment getTextAlignment() {
        return textAlignment == null ? TextAlignment.LEFT : textAlignment.get();
    }

    public final ObjectProperty<TextAlignment> textAlignmentProperty() {
        if (textAlignment == null) {
            textAlignment =
                new StyleableObjectProperty<TextAlignment>(TextAlignment.LEFT) {
                @Override public Object getBean() { return TextFlow.this; }
                @Override public String getName() { return "textAlignment"; }
                @Override public CssMetaData<TextFlow, TextAlignment> getCssMetaData() {
                    return StyleableProperties.TEXT_ALIGNMENT;
                }
                @Override public void invalidated() {
                    TextAlignment align = get();
                    if (align == null) align = TextAlignment.LEFT;
                    TextLayout layout = getTextLayout();
                    layout.setAlignment(align.ordinal());
                    requestLayout();
                }
            };
        }
        return textAlignment;
    }

    
Defines the vertical space in pixel between lines.
@defaultValue
0
Since:
JavaFX 8.0/**
     * Defines the vertical space in pixel between lines.
     *
     * @defaultValue 0
     *
     * @since JavaFX 8.0
     */
    private DoubleProperty lineSpacing;

    public final void setLineSpacing(double spacing) {
        lineSpacingProperty().set(spacing);
    }

    public final double getLineSpacing() {
        return lineSpacing == null ? 0 : lineSpacing.get();
    }

    public final DoubleProperty lineSpacingProperty() {
        if (lineSpacing == null) {
            lineSpacing =
                new StyleableDoubleProperty(0) {
                @Override public Object getBean() { return TextFlow.this; }
                @Override public String getName() { return "lineSpacing"; }
                @Override public CssMetaData<TextFlow, Number> getCssMetaData() {
                    return StyleableProperties.LINE_SPACING;
                }
                @Override public void invalidated() {
                    TextLayout layout = getTextLayout();
                    if (layout.setLineSpacing((float)get())) {
                        requestLayout();
                    }
                }
            };
        }
        return lineSpacing;
    }

    @Override public final double getBaselineOffset() {
        Insets insets = getInsets();
        double top = snapSpaceY(insets.getTop());
        return top - getTextLayout().getBounds().getMinY();
    }

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

    /*
     * Super-lazy instantiation pattern from Bill Pugh.
     */
     private static class StyleableProperties {

         private static final
             CssMetaData<TextFlow, TextAlignment> TEXT_ALIGNMENT =
                 new CssMetaData<TextFlow,TextAlignment>("-fx-text-alignment",
                 new EnumConverter<TextAlignment>(TextAlignment.class),
                 TextAlignment.LEFT) {

            @Override public boolean isSettable(TextFlow node) {
                return node.textAlignment == null || !node.textAlignment.isBound();
            }

            @Override public StyleableProperty<TextAlignment> getStyleableProperty(TextFlow node) {
                return (StyleableProperty<TextAlignment>)node.textAlignmentProperty();
            }
         };

         private static final
             CssMetaData<TextFlow,Number> LINE_SPACING =
                 new CssMetaData<TextFlow,Number>("-fx-line-spacing",
                 SizeConverter.getInstance(), 0) {

            @Override public boolean isSettable(TextFlow node) {
                return node.lineSpacing == null || !node.lineSpacing.isBound();
            }

            @Override public StyleableProperty<Number> getStyleableProperty(TextFlow node) {
                return (StyleableProperty<Number>)node.lineSpacingProperty();
            }
         };

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

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

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

    /* The methods in this section are copied from Region due to package visibility restriction */
    private static double snapSpace(double value, boolean snapToPixel) {
        return snapToPixel ? Math.round(value) : value;
    }

    static double boundedSize(double min, double pref, double max) {
        double a = pref >= min ? pref : min;
        double b = min >= max ? min : max;
        return a <= b ? a : b;
    }

    double computeChildPrefAreaWidth(Node child, Insets margin) {
        return computeChildPrefAreaWidth(child, margin, -1);
    }

    double computeChildPrefAreaWidth(Node child, Insets margin, double height) {
        final boolean snap = isSnapToPixel();
        double top = margin != null? snapSpace(margin.getTop(), snap) : 0;
        double bottom = margin != null? snapSpace(margin.getBottom(), snap) : 0;
        double left = margin != null? snapSpace(margin.getLeft(), snap) : 0;
        double right = margin != null? snapSpace(margin.getRight(), snap) : 0;
        double alt = -1;
        if (child.getContentBias() == Orientation.VERTICAL) { // width depends on height
            alt = snapSizeY(boundedSize(
                    child.minHeight(-1), height != -1? height - top - bottom :
                           child.prefHeight(-1), child.maxHeight(-1)));
        }
        return left + snapSizeX(boundedSize(child.minWidth(alt), child.prefWidth(alt), child.maxWidth(alt))) + right;
    }

    double computeChildPrefAreaHeight(Node child, Insets margin) {
        return computeChildPrefAreaHeight(child, margin, -1);
    }

    double computeChildPrefAreaHeight(Node child, Insets margin, double width) {
        final boolean snap = isSnapToPixel();
        double top = margin != null? snapSpace(margin.getTop(), snap) : 0;
        double bottom = margin != null? snapSpace(margin.getBottom(), snap) : 0;
        double left = margin != null? snapSpace(margin.getLeft(), snap) : 0;
        double right = margin != null? snapSpace(margin.getRight(), snap) : 0;
        double alt = -1;
        if (child.getContentBias() == Orientation.HORIZONTAL) { // height depends on width
            alt = snapSizeX(boundedSize(
                    child.minWidth(-1), width != -1? width - left - right :
                           child.prefWidth(-1), child.maxWidth(-1)));
        }
        return top + snapSizeY(boundedSize(child.minHeight(alt), child.prefHeight(alt), child.maxHeight(alt))) + bottom;
    }
    /* end of copied code */

    
{@inheritDoc} /** {@inheritDoc} */
    @Override
    public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
        switch (attribute) {
            case TEXT: {
                String accText = getAccessibleText();
                if (accText != null && !accText.isEmpty()) return accText;

                StringBuilder title = new StringBuilder();
                for (Node node: getChildren()) {
                    Object text = node.queryAccessibleAttribute(AccessibleAttribute.TEXT, parameters);
                    if (text != null) {
                        title.append(text.toString());
                    }
                }
                return title.toString();
            }
            default: return super.queryAccessibleAttribute(attribute, parameters);
        }
    }
}