TestFile.dat.3

A property that represents the dialog expandable content area. Any Node
     * can be placed in this area, but it will only be shown when the user
     * clicks the 'Show Details' expandable button. This button will be added
     * automatically when the expandable content property is non-null.
     */
    public final ObjectProperty<Node> expandableContentProperty() {
        return expandableContentProperty;
    }

    /**
     * Returns the dialog expandable content node, if one is set, or null
     * otherwise.
     */
    public final Node getExpandableContent() {
        return expandableContentProperty.get();
    }

    /**
     * Sets the dialog expandable content node, or null if no expandable content
     * needs to be shown.
     */
    public final void setExpandableContent(Node content) {
        this.expandableContentProperty.set(content);
    }


    // --- expanded
    private final BooleanProperty expandedProperty = new SimpleBooleanProperty(this, "expanded", false) {
        protected void invalidated() {
            final Node expandableContent = getExpandableContent();

            if (expandableContent != null) {
                expandableContent.setVisible(isExpanded());
            }

            requestLayout();
        }
    };

    /**
     * Represents whether the dialogPane is expanded.
     */
    public final BooleanProperty expandedProperty() {
        return expandedProperty;
    }

    /**
     * Returns whether or not the dialogPane is expanded.
     *
     * @return true if dialogPane is expanded.
     */
    public final boolean isExpanded() {
        return expandedProperty().get();
    }

    /**
     * Sets whether the dialogPane is expanded. This only makes sense when there
     * is {@link #expandableContentProperty() expandable content} to show.
     *
     * @param value true if dialogPane should be expanded.
     */
    public final void setExpanded(boolean value) {
        expandedProperty().set(value);
    }



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

    // --- button types
    /**
     * Observable list of button types used for the dialog button bar area
     * (created via the {@link #createButtonBar()} method). Modifying the contents
     * of this list will immediately change the buttons displayed to the user
     * within the dialog pane.
     *
     * @return The {@link ObservableList} of {@link ButtonType button types}
     *         available to the user.
     */
    public final ObservableList<ButtonType> getButtonTypes() {
        return buttons;
    }

    /**
     * This method provides a way in which developers may retrieve the actual
     * Node for a given {@link ButtonType} (assuming it is part of the
     * {@link #getButtonTypes() button types} list).
     *
     * @param buttonType The {@link ButtonType} for which a Node representation is requested.
     * @return The Node used to represent the button type, as created by
     *         {@link #createButton(ButtonType)}, and only if the button type
     *         is part of the {@link #getButtonTypes() button types} list, otherwise null.
     */
    public final Node lookupButton(ButtonType buttonType) {
        return buttonNodes.get(buttonType);
    }

    /**
     * This method can be overridden by subclasses to provide the button bar.
     * Note that by overriding this method, the developer must take on multiple
     * responsibilities:
     *
     * <ol>
     *   <li>The developer must immediately iterate through all
     *   {@link #getButtonTypes() button types} and call
     *   {@link #createButton(ButtonType)} for each of them in turn.
     *   <li>The developer must add a listener to the
     *   {@link #getButtonTypes() button types} list, and when this list changes
     *   update the button bar as appropriate.
     *   <li>Similarly, the developer must watch for changes to the
     *   {@link #expandableContentProperty() expandable content} property,
     *   adding and removing the details button (created via
     *   {@link #createDetailsButton()} method).
     * </ol>
     *
     * <p>The default implementation of this method creates and returns a new
     * {@link ButtonBar} instance.
     */
    protected Node createButtonBar() {
        ButtonBar buttonBar = new ButtonBar();
        buttonBar.setMaxWidth(Double.MAX_VALUE);

        updateButtons(buttonBar);
        getButtonTypes().addListener((ListChangeListener<? super ButtonType>) c -> updateButtons(buttonBar));
        expandableContentProperty().addListener(o -> updateButtons(buttonBar));

        return buttonBar;
    }

    /**
     * This method can be overridden by subclasses to create a custom button that
     * will subsequently inserted into the DialogPane button area (created via
     * the {@link #createButtonBar()} method, but mostly commonly it is an instance
     * of {@link ButtonBar}.
     *
     * @param buttonType The {@link ButtonType} to create a button from.
     * @return A JavaFX {@link Node} that represents the given {@link ButtonType},
     *         most commonly an instance of {@link Button}.
     */
    protected Node createButton(ButtonType buttonType) {
        final Button button = new Button(buttonType.getText());
        final ButtonData buttonData = buttonType.getButtonData();
        ButtonBar.setButtonData(button, buttonData);
        button.setDefaultButton(buttonType != null && buttonData.isDefaultButton());
        button.setCancelButton(buttonType != null && buttonData.isCancelButton());
        button.addEventHandler(ActionEvent.ACTION, ae -> {
            if (ae.isConsumed()) return;
            if (dialog != null) {
                dialog.impl_setResultAndClose(buttonType, true);
            }
        });

        return button;
    }

    /**
     * This method can be overridden by subclasses to create a custom details button.
     *
     * <p>To override this method you must do two things:
     * <ol>
     *   <li>The button will need to have its own code set to handle mouse / keyboard
     *       interaction and to toggle the state of the
     *       {@link #expandedProperty() expanded} property.
     *   <li>If your button changes its visuals based on whether the dialog pane
     *       is expanded or collapsed, you should add a listener to the
     *       {@link #expandedProperty() expanded} property, so that you may update
     *       the button visuals.
     * </ol>
     */
    protected Node createDetailsButton() {
        final Hyperlink detailsButton = new Hyperlink();
        final String moreText = ControlResources.getString("Dialog.detail.button.more"); //$NON-NLS-1$
        final String lessText = ControlResources.getString("Dialog.detail.button.less"); //$NON-NLS-1$

        InvalidationListener expandedListener = o -> {
            final boolean isExpanded = isExpanded();
            detailsButton.setText(isExpanded ? lessText : moreText);
            detailsButton.getStyleClass().setAll("details-button", (isExpanded ? "less" : "more")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
        };

        // we call the listener immediately to ensure the state is correct at start up
        expandedListener.invalidated(null);
        expandedProperty().addListener(expandedListener);

        detailsButton.setOnAction(ae -> setExpanded(!isExpanded()));
        return detailsButton;
    }

    private double oldHeight = -1;

    /** {@inheritDoc} */
    @Override protected void layoutChildren() {
        final boolean hasHeader = hasHeader();

        // snapped insets code commented out to resolve RT-39738
        final double w = Math.max(minWidth(-1), getWidth());// - (snappedLeftInset() + snappedRightInset());

        final double minHeight = minHeight(w);
        final double prefHeight = prefHeight(w);
        final double maxHeight = maxHeight(w);
        final double currentHeight = getHeight();
        final double dialogHeight = dialog == null ? 0 : dialog.dialog.getSceneHeight();
        double h;

        if (prefHeight > currentHeight && prefHeight > minHeight && (prefHeight <= dialogHeight || dialogHeight == 0)) {
            h = prefHeight;
            resize(w, h);
        } else {
            boolean isDialogGrowing = currentHeight > oldHeight;

            if (isDialogGrowing) {
                double _h = currentHeight < prefHeight ?
                        Math.min(prefHeight, currentHeight) : Math.max(prefHeight, dialogHeight);
                h = Utils.boundedSize(_h, minHeight, maxHeight);
            } else {
                h = Utils.boundedSize(Math.min(currentHeight, dialogHeight), minHeight, maxHeight);
            }
            resize(w, h);
        }

        h -= (snappedTopInset() + snappedBottomInset());

        oldHeight = h;

        final double leftPadding = snappedLeftInset();
        final double topPadding = snappedTopInset();
        final double rightPadding = snappedRightInset();
        final double bottomPadding = snappedBottomInset();

        // create the nodes up front so we can work out sizing
        final Node header = getActualHeader();
        final Node content = getActualContent();
        final Node graphic = getActualGraphic();
        final Node expandableContent = getExpandableContent();

        final double graphicPrefWidth = hasHeader || graphic == null ? 0 : graphic.prefWidth(-1);
        final double headerPrefHeight = hasHeader ? header.prefHeight(w) : 0;
        final double buttonBarPrefHeight = buttonBar == null ? 0 : buttonBar.prefHeight(w);
        final double graphicPrefHeight = hasHeader || graphic == null ? 0 : graphic.prefHeight(-1);

        final double expandableContentPrefHeight;
        final double contentAreaHeight;
        final double contentAndGraphicHeight;

        final double availableContentWidth = w - graphicPrefWidth - leftPadding - rightPadding;

        if (isExpanded()) {
            // precedence goes to content and then expandable content
            contentAreaHeight = isExpanded() ? content.prefHeight(availableContentWidth) : 0;
            contentAndGraphicHeight = hasHeader ? contentAreaHeight : Math.max(graphicPrefHeight, contentAreaHeight);
            expandableContentPrefHeight = h - (headerPrefHeight + contentAndGraphicHeight + buttonBarPrefHeight);
        } else {
            // content gets the lowest precedence
            expandableContentPrefHeight = isExpanded() ? expandableContent.prefHeight(w) : 0;
            contentAreaHeight = h - (headerPrefHeight + expandableContentPrefHeight + buttonBarPrefHeight);
            contentAndGraphicHeight = hasHeader ? contentAreaHeight : Math.max(graphicPrefHeight, contentAreaHeight);
        }

        double x = leftPadding;
        double y = topPadding;

        if (! hasHeader) {
            if (graphic != null) {
                graphic.resizeRelocate(x, y, graphicPrefWidth, graphicPrefHeight);
                x += graphicPrefWidth;
            }
        } else {
            header.resizeRelocate(x, y, w - (leftPadding + rightPadding), headerPrefHeight);
            y += headerPrefHeight;
        }

        content.resizeRelocate(x, y, availableContentWidth, contentAreaHeight);
        y += hasHeader ? contentAreaHeight : contentAndGraphicHeight;

        if (expandableContent != null) {
            expandableContent.resizeRelocate(leftPadding, y, w - rightPadding, expandableContentPrefHeight);
            y += expandableContentPrefHeight;
        }

        if (buttonBar != null) {
            buttonBar.resizeRelocate(leftPadding,
                                     y,
                                     w - (leftPadding + rightPadding),
                                     buttonBarPrefHeight);
        }
    }

    /** {@inheritDoc}