Synchronizing two scroll bars JavaFX

Question

My problem is I have two horizontal scroll bars that I want them to scroll in unison and I\'ve tried using:

bar1.valueProperty().bindBidirectional(bar2.valuePr

Answer 1

Bidi-Binding of valueProperty of a scrollBar in a scrollPane to that of a scrollBar in a tableView is not possible because the former is normalized while the latter is not. Instead, listen to changes and scale manually, like:

protected void bindScrollBarValues(ScrollBar scrollBarInTable, ScrollBar scrollBarInPane) {
    // can't use bidi-binding because bar in scrollPane is normalized, bar in table is not
    // scrollBarInTable.valueProperty().bindBidirectional(scrollBarInPane.valueProperty());
    // scale manually
    scrollBarInTable.valueProperty().addListener((src, ov, nv) -> {
        double tableMax = scrollBarInTable.getMax();
        scrollBarInPane.setValue(nv.doubleValue() / tableMax);
    });

    scrollBarInPane.valueProperty().addListener((src, ov, nv) -> {
        double tableMax = scrollBarInTable.getMax();
        scrollBarInTable.setValue(nv.doubleValue() * tableMax);
    });
}