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Re: [nebula-dev] computeSize in Control
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The preferred size only if you pass SWT.DEFAULT as a hint!
Tom
Am 11.05.12 09:00, schrieb Hallvard Trætteberg:
> 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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>> nebula-dev@xxxxxxxxxxx <mailto:nebula-dev@xxxxxxxxxxx>
>> https://dev.eclipse.org/__mailman/listinfo/nebula-dev
>> <https://dev.eclipse.org/mailman/listinfo/nebula-dev>
>>
>>
>>
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