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dynamical CreateFeatures ? [message #710172]

Thu, 04 August 2011 15:27

Eclipse User

Motivation: in the Graphiti tutorial in the Help, the creation of each object (Eclass) corresponds to a (say) MyCreateFeature class, there is a single class, and a single instance of this class, and a single create icon in the palette; and the "name" of each create object is filled by the user in a creation popup. Suppose that, in addition to that, I wish to have some feature to create some set of Eclass objects with some predetermined names

I'd wish to avoid to code a separate CreateFeature class for each case.
I wonder, if, for example, I could add some "name" property to my MyCreateFeature class, and create several instances of this class to return them in my MyFeatureProvider.getCreateFeatures() , so that each instance would have a different behaviour. Would this be impossible, or convoluted?

In particular, it's not clear for me which is the contract of the IFeatureProvider.getCreateFeatures() method: when is this -internally- called? Only for the palette? Must this be in sync with the palette? Can I have several instances of the same class?

Another issue (more difficult, I guess) would be to make those instances dynamic; for what I see, the contents of the palette MyToolBehaviorProvider.getPalette() seems to be static, is that so?

[Updated on: Thu, 04 August 2011 15:29] by Moderator

Re: dynamical CreateFeatures ? [message #710222 is a reply to message #710172]

Thu, 04 August 2011 16:40

Eclipse User

Hi Hernan,

the palette is build up in the DefaultToolBehaviorProvider.getPalette method. There is the access to the create features provided by the feature provider:

ICreateFeature[] createFeatures = featureProvider.getCreateFeatures();

for (ICreateFeature createFeature : createFeatures) {
   ObjectCreationToolEntry objectCreationToolEntry = new ObjectCreationToolEntry(createFeature.getCreateName(),
   createFeature.getCreateDescription(), createFeature.getCreateImageId(), createFeature.getCreateLargeImageId(), createFeature);

   compartmentEntry.addToolEntry(objectCreationToolEntry);
}

You can override that method in your own tool behavior provider to inject your parameterized create feature instances.

The call chain is
DiagramEditorInternal.refreshPalette()
-> GFPaletteRoot .updatePaletteEntries()
-> IToolBehaviorProvider.getPalette()

So you can get trigger the refresh of the palette by calling getDiagramEditor().refreshPalette(), as getDiagramEditor() is defined in AbstractFeature and so available in every feature class.

Cheers
Joerg

Re: dynamical CreateFeatures ? [message #710362 is a reply to message #710222]

Thu, 04 August 2011 20:07

Eclipse User

Great, thanks.

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