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Layout Problems [message #505300]

Tue, 29 December 2009 12:31

Jordan Borisov

Messages: 9
Registered: July 2009

Junior Member

I have problems with getting the size and the location of layout widget for example a Canvas. The layout which I'm using is GridLayout and I need the height and the width of the canvas but I can't get them.
The result of calling the method getSize is 0 - width , 0- height.
My question is how can I get the size of a canvas when I'm using layouts?

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Re: Layout Problems [message #505650 is a reply to message #505300]

Mon, 04 January 2010 02:06

Jordan Borisov

Messages: 9
Registered: July 2009

Junior Member

I found a way to get the size of Canvas positioned with layout. In a paint listener I can get the bounds of the widget. But I don't like this method because I can't use the size parameters before the widget is painted.
How can I get the size of a Canvas without a paint listener?

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Re: Layout Problems [message #505717 is a reply to message #505650]

Mon, 04 January 2010 16:25

Grant Gayed

Messages: 2150
Registered: July 2009

Senior Member

Hi,

A Control's size is 0,0 until it has been set, either by you (eg.- with
Control.setSize(...)), or by a layout. Once it has been set then
Control.getSize() should always work. Are you asking it for its size before
it has been laid out? If so, maybe
Control.computeSize(SWT.DEFAULT,SWT.DEFAULT) is what you want (in which case
the default answer for Canvas is 64x64)?

Grant

"Jordan Borisov" <xstream9014@gmail.com> wrote in message
news:hhs3vu$5n0$1@build.eclipse.org...
> I found a way to get the size of Canvas positioned with layout. In a
paint listener I can get the bounds of the widget. But I don't like this
method because I can't use the size parameters before the widget is
painted.
> How can I get the size of a Canvas without a paint listener?

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