Re: [nebula-dev] computeSize in Control

[Hallvard Trætteberg <hal@xxxxxxxxxxx>]

Well, some places say it should return the preferred size. In the case 
of GeoMap, I think it is reasonable to at least ask for the size 
corresponding to one map tile.

Hallvard

On 10.05.12 17.33, Matthew Hall wrote:
> The computeSize method should report the minimum size needed by the
> control. Expanding the control to fill available space is the
> responsibility of the container control, using layout data hints.
>
> -Matthew
>
> On May 10, 2012 8:25 AM, "Hallvard Trætteberg" <hal@xxxxxxxxxxx
> <mailto:hal@xxxxxxxxxxx>> wrote:
>
>     Hi,
>
>     I have been looking at implementing computeSize in GeoMap, so it
>     "grabs" more space than the minimum when there are no constraints. I
>     test it by creating an anonymous subclass in GeoMapViewer's
>     constructor. First I tried
>
>             public GeoMapViewer(Composite parent, int flags) {
>                     this(new GeoMap(parent, flags) {
>                             @Override
>                             public Point computeSize(int wHint, int
>     hHint, boolean changed) {
>                                     int w = (wHint != SWT.DEFAULT ?
>     wHint : Integer.MAX_VALUE);
>                                     int h = (hHint != SWT.DEFAULT ?
>     hHint : Integer.MAX_VALUE);
>                                     return new Point(w, h);
>                             }
>                     });
>             }
>
>     The idea is to indicate that ideally GeoMap wants as much space as
>     possible. I was pretty surprised that the wish for Integer.MAX_VALUE
>     width and height was granted, in the sense that getSize() reported
>     these dimensions not that the layout actually gave it that much
>     space. This gave problems in the paint method, so I reduced the
>     value from Integer.MAX_VALUE to 256 * 8.
>
>     Two question:
>     - (how) can the computeSize method say that it wants as much as
>     possible, but can accept nothing?
>     - why isn't the size returned by getSize() actually reduced to the
>     visible size instead of the value asked for by computeSize?
>
>     Hallvard
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