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[EMF Forms] integrate Buttons for operations [message #1755575]

Sun, 05 March 2017 22:11

Jens Kutzsche

Messages: 4
Registered: July 2009

Junior Member

Hi,

I would like to integrate a button into a form. This button should invokes an operation of the root data model object. I could neither find a button as view model element, nor a possibility to bind an operation to an element. If I want to write my own renderer for the button, then I miss the possibility to access the root data model element which is linked to the form.

Please give me a hint which is the recommended procedure for my purposes.

Best regards
Jens

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Re: [EMF Forms] integrate Buttons for operations [message #1755725 is a reply to message #1755575]

Tue, 07 March 2017 09:04

Jonas Helming

Messages: 103
Registered: September 2016

Senior Member

Hi,

you can access the domain model using viewmodelContext.getDomainModel()

Best regards
Jonas

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Re: [EMF Forms] integrate Buttons for operations [message #1755741 is a reply to message #1755725]

Tue, 07 March 2017 11:39

Jens Kutzsche

Messages: 4
Registered: July 2009

Junior Member

Hi Jonas,

thank you for your answer. Is there also a way to create a reference to an operation in the view model? Otherwise I would have to write for each individual button one renderer, which knows the referenced operation.

Is there another recommended procedure to insert buttons in forms?

Best regards
Jens

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Re: [EMF Forms] integrate Buttons for operations [message #1755815 is a reply to message #1755741]

Wed, 08 March 2017 11:50

Jonas Helming

Messages: 103
Registered: September 2016

Senior Member

Hi Jens,

absolutly! The view model itself is and EMF model. Further it has been designed in a very modular way, so it is absolutly possible to add new elements (e.g. action). We thought about adding this several times in the past. However, all use cases that we had so fra were actually actiosn which are directly related to an attribute and were therefore implemented within custom renderers. There might be a use case to really place button. Would be interesting to learn more about that.
About adding new view model elements: Best starting point would be to look at an existing element, which is not part of the code, e.g. "group" or "controlgrid". Adding a new view model element consists of:
1. Adding the model (the definition of the view model)
2. Adding a renderer + tests
3. Optionally adapting the tooling (as the view model editor uses EMF Forms itself, this is usually trivial)

Please note, that we use the "emfforms" namespace for new bundles rather then the "ecp" one.
Would be interesting to learn more about your plans!

Best regards

Jonas
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Jonas Helming
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Re: [EMF Forms] integrate Buttons for operations [message #1758237 is a reply to message #1755815]

Sat, 25 March 2017 13:41

Jens Kutzsche

Messages: 4
Registered: July 2009

Junior Member

Hi Jonas,

thank you for your answer and sorry for my late answer, but I stopped my try with EMF Forms. My application has an to less formal UI and to many custom renderers would have been necessary. So other things were more important in recent weeks.

I use the MVVM Pattern for my application. I thought EMF Forms is perfect for this pattern if the framework renders my view model as UI and bind the widgets to the view model. My model has several operations e.g. for loading and saving of different file types and this actions should be buttons. So I missed the possibility to call an operation with a button.

Best regards
Jens

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Re: [EMF Forms] integrate Buttons for operations [message #1758246 is a reply to message #1758237]

Sat, 25 March 2017 18:32

Jonas Helming

Messages: 103
Registered: September 2016

Senior Member

Hi Jens,

actually, adding a custom renderer ist usally not more work then implementing 2-3 occurences manually. The difference is that you can then very efficiently reuse that new concept anywhere. Extending the framework with custom renderers is a default case, so most projects do that.

Best regards

Jonas

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