javaswtscrollbarstyledtexttandem

SWT Create Two StyledText That Scroll In Tandem


I have to create two StyledText that scroll in tandem , All I am getting is code for creating same using ScrolledComposites . I have limitation of using StyledText only because, I am using it for other purpose as well. I want to create same thing link here but using StyledText.

I tried same code replacing ScrolledComposites with StyledText but it din't allowed me to setOrigin(x , y) .


Solution

  • You can use the methods StyledText#setHorizontalPixel() and StyledText#setTopPixel() (and their respecrive get methods) to get and set the positions:

    public static void main(String[] args)
    {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
    
        StyledText one = new StyledText(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
        StyledText two = new StyledText(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    
        one.setAlwaysShowScrollBars(true);
        two.setAlwaysShowScrollBars(true);
    
        one.setText("Scroll scroll scroll\ndown down down\nto to to\nsee see see\nthe the the\nstyled styled styled\ntexts texts texts\nscroll scroll scroll\nin in in\ntandem tandem tandem");
        two.setText("Scroll scroll scroll\ndown down down\nto to to\nsee see see\nthe the the\nstyled styled styled\ntexts texts texts\nscroll scroll scroll\nin in in\ntandem tandem tandem");
    
        handleVerticalScrolling(one, two);
        handleHorizontalScrolling(one, two);
    
        shell.pack();
        shell.setSize(200, 100);
        shell.open();
    
        while (!shell.isDisposed())
        {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
    
    private static void handleHorizontalScrolling(StyledText one, StyledText two)
    {
        ScrollBar hOne = one.getHorizontalBar();
        ScrollBar hTwo = two.getHorizontalBar();
    
        hOne.addListener(SWT.Selection, e -> {
            int x = one.getHorizontalPixel();
            two.setHorizontalPixel(x);
        });
        hTwo.addListener(SWT.Selection, e -> {
            int x = two.getHorizontalPixel();
            one.setHorizontalPixel(x);
        });
    }
    
    private static void handleVerticalScrolling(StyledText one, StyledText two)
    {
        ScrollBar vOne = one.getVerticalBar();
        ScrollBar vTwo = two.getVerticalBar();
    
        vOne.addListener(SWT.Selection, e ->
        {
            int y = one.getTopPixel();
            two.setTopPixel(y);
        });
        vTwo.addListener(SWT.Selection, e ->
        {
            int y = two.getTopPixel();
            one.setTopPixel(y);
        });
    }