How to implememt a dynamic sized shell with a ScrolledComposite in eclipse SWT?

Question

I have created a Shell and added a ScrolledComposite to it that contains a Text as its content. But I want the shell to change the size dynamically based on the content size. My implementation is as follows

    shell.setLayout(new GridLayout(1,true));
    ScrolledComposite sc = new ScrolledComposite(shell, SWT.V_SCROLL|SWT.H_SCROLL);
    sc.setLayoutData(GridDataFactory.fillDefaults().grab(true, true).hint(200, 200).create());  

    sc.setExpandHorizontal(true);
    sc.setExpandVertical(true);

    Composite top = new Composite(sc,SWT.NONE);
    top.setLayout(GridLayoutFactory.swtDefaults().numColumns(1).create());

    StyledText styledText = new StyledText(top, SWT.NONE);
    styledText.setText(text);

    StyleRange style = new StyleRange();
    style.start = 0;
    style.length = text.indexOf(":"); //$NON-NLS-1$
    style.fontStyle = SWT.BOLD;     
    styledText.setStyleRange(style);    


    sc.setContent(top);
//  shell.setSize(sc.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    sc.setMinSize(top.computeSize(SWT.DEFAULT, SWT.DEFAULT));

    sc.pack(true);
    shell.setVisible(true);

When I uncomment the commented line in above code, shell is resizing based on content, but unable to achieve scrollbar in this case.

I want to get scrollbar as well if content is beyond certain limit. If the content is within the limit, I do not want the shell to have extra blank space.

Can someone help me here ??

`StyledText` supports scrolling itself, it doesn't need to be in a `ScrolledComposite`. — greg-449, Oct 26 '17 at 12:46

score 2 · Accepted Answer · answered Oct 27 '17 at 07:37

2

StyledText supports scrolling itself there is no need to using ScrolledComposite:

Shell shell = new Shell(display, SWT.SHELL_TRIM);

shell.setLayout(new GridLayout());

StyledText text = new StyledText(shell, SWT.V_SCROLL | SWT.H_SCROLL);

text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

text.setText(....);

shell.layout();

Point size = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT);

shell.setSize(Math.min(size.x, 100), Math.min(size.y, 100));

shell.open();

Instead of using shell.pack() just call shell.layout and then shell.computeSize to see what the unscrolled size would be. Adjust the size if it is too large and call shell.setSize.

answered Oct 27 '17 at 07:37

greg-449

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How can I use StyledText to show scrollbars only when the data exceeds certain limit ? As in for eg, if text is more than 100 lines, then scrollbar should appear. Is this possible ? – Sneha V Nov 06 '17 at 09:12
This code does that for me on macOS. Possibly it is not so clever on other platforms (which I can't test). – greg-449 Nov 06 '17 at 09:36

How to implememt a dynamic sized shell with a ScrolledComposite in eclipse SWT?

1 Answers1