Examples with StyledSegment org.fxmisc.richtext.model.StyledSegment used on opensource projects

Example 1 with StyledSegment

use of org.fxmisc.richtext.model.StyledSegment in project RichTextFX by FXMisc.

the class GenericStyledArea method createCell.

/* ********************************************************************** *
     *                                                                        *
     * Private methods                                                        *
     *                                                                        *
     * ********************************************************************** */
private Cell<Paragraph<PS, SEG, S>, ParagraphBox<PS, SEG, S>> createCell(Paragraph<PS, SEG, S> paragraph, BiConsumer<TextFlow, PS> applyParagraphStyle, Function<StyledSegment<SEG, S>, Node> nodeFactory) {
    ParagraphBox<PS, SEG, S> box = new ParagraphBox<>(paragraph, applyParagraphStyle, nodeFactory);
    box.highlightTextFillProperty().bind(highlightTextFill);
    box.wrapTextProperty().bind(wrapTextProperty());
    box.graphicFactoryProperty().bind(paragraphGraphicFactoryProperty());
    box.graphicOffset.bind(virtualFlow.breadthOffsetProperty());
    EventStream<Integer> boxIndexValues = box.indexProperty().values().filter(i -> i != -1);
    Subscription firstParPseudoClass = boxIndexValues.subscribe(idx -> box.pseudoClassStateChanged(FIRST_PAR, idx == 0));
    Subscription lastParPseudoClass = EventStreams.combine(boxIndexValues, getParagraphs().sizeProperty().values()).subscribe(in -> in.exec((i, n) -> box.pseudoClassStateChanged(LAST_PAR, i == n - 1)));
    // set up caret
    Function<CaretNode, Subscription> subscribeToCaret = caret -> {
        EventStream<Integer> caretIndexStream = EventStreams.nonNullValuesOf(caret.paragraphIndexProperty());
        // a new event stream needs to be created for each caret added, so that it will immediately
        // fire the box's current index value as an event, thereby running the code in the subscribe block
        // Reusing boxIndexValues will not fire its most recent event, leading to a caret not being added
        // Thus, we'll call the new event stream "fresh" box index values
        EventStream<Integer> freshBoxIndexValues = box.indexProperty().values().filter(i -> i != -1);
        return EventStreams.combine(caretIndexStream, freshBoxIndexValues).subscribe(t -> {
            int caretParagraphIndex = t.get1();
            int boxIndex = t.get2();
            if (caretParagraphIndex == boxIndex) {
                box.caretsProperty().add(caret);
            } else {
                box.caretsProperty().remove(caret);
            }
        });
    };
    Subscription caretSubscription = caretSet.addSubscriber(subscribeToCaret);
    // TODO: how should 'hasCaret' be handled now?
    Subscription hasCaretPseudoClass = EventStreams.combine(boxIndexValues, Val.wrap(currentParagraphProperty()).values()).map(t -> t.get1().equals(t.get2())).subscribe(value -> box.pseudoClassStateChanged(HAS_CARET, value));
    Function<Selection<PS, SEG, S>, Subscription> subscribeToSelection = selection -> {
        EventStream<Integer> startParagraphValues = EventStreams.nonNullValuesOf(selection.startParagraphIndexProperty());
        EventStream<Integer> endParagraphValues = EventStreams.nonNullValuesOf(selection.endParagraphIndexProperty());
        // see comment in caret section about why a new box index EventStream is needed
        EventStream<Integer> freshBoxIndexValues = box.indexProperty().values().filter(i -> i != -1);
        return EventStreams.combine(startParagraphValues, endParagraphValues, freshBoxIndexValues).subscribe(t -> {
            int startPar = t.get1();
            int endPar = t.get2();
            int boxIndex = t.get3();
            if (startPar <= boxIndex && boxIndex <= endPar) {
                // So that we don't add multiple paths for the same selection,
                // which leads to not removing the additional paths when selection is removed,
                // this is a `Map#putIfAbsent(Key, Value)` implementation that creates the path lazily
                SelectionPath p = box.selectionsProperty().get(selection);
                if (p == null) {
                    // create & configure path
                    Val<IndexRange> range = Val.create(() -> boxIndex != -1 ? getParagraphSelection(selection, boxIndex) : EMPTY_RANGE, selection.rangeProperty());
                    SelectionPath path = new SelectionPath(range);
                    selection.configureSelectionPath(path);
                    box.selectionsProperty().put(selection, path);
                }
            } else {
                box.selectionsProperty().remove(selection);
            }
        });
    };
    Subscription selectionSubscription = selectionSet.addSubscriber(subscribeToSelection);
    return new Cell<Paragraph<PS, SEG, S>, ParagraphBox<PS, SEG, S>>() {

        @Override
        public ParagraphBox<PS, SEG, S> getNode() {
            return box;
        }

        @Override
        public void updateIndex(int index) {
            box.setIndex(index);
        }

        @Override
        public void dispose() {
            box.highlightTextFillProperty().unbind();
            box.wrapTextProperty().unbind();
            box.graphicFactoryProperty().unbind();
            box.graphicOffset.unbind();
            firstParPseudoClass.unsubscribe();
            lastParPseudoClass.unsubscribe();
            caretSubscription.unsubscribe();
            hasCaretPseudoClass.unsubscribe();
            selectionSubscription.unsubscribe();
        }
    };
}