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Canvas overlaying Shell [message #780966]

Fri, 20 January 2012 04:04

Paul Morris

Messages: 9
Registered: December 2011

Junior Member

Is it possible to position a canvas to overlay the shell wherein it takes up the whole space that the shell does? I've tried looking into layouts and trying to force the canvas to overlay the shell by using setLocation and setBounds but I think I'm working against the API here. I'm doing this:

getWindowConfigurer().setShellStyle(SWT.NO_TRIM | SWT.ON_TOP | SWT.NO_BACKGROUND);

then this:

Toolkit toolkit = Toolkit.getDefaultToolkit();
Dimension dim = toolkit.getScreenSize();
Shell shell = getWindowConfigurer().getWindow().getShell();
shell.setBounds(new Rectangle(0, 0, (int)dim.getWidth(), (int)dim.getHeight()));
shell.setAlpha(20);

and then this (with parent being a reference to the shell):

FillLayout fill = new FillLayout();
parent.setLayout(fill);
final Canvas paintCanvas = new Canvas(parent, SWT.NO_REDRAW_RESIZE | SWT.NONE);
paintCanvas.setLocation(0, 0);
paintCanvas.setBounds(parent.getBounds());

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Re: Canvas overlaying Shell [message #781145 is a reply to message #780966]

Fri, 20 January 2012 17:25

Brian de Alwis

Messages: 500
Registered: January 2012

Senior Member

A layout is responsible for managing the children's positions and bounds. The next time your shell is moved or resized, your canvas may be resized. You either do manual positioning OR you use a layout.

Though in your case, providing the shell has no other children, the FillLayout should do exactly hat you want.

BTW: I'm assuming the Toolkit calls are to the AWT toolkit: avoid mixing SWT and Swing/AWT. You can get the screen details from SWT's Display.

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