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Re: [jwt-dev] support for multiple views
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Hi Christian,
I agree with your proposal.
Marc.
Christian Saad a écrit :
Hi all,
as announced, I’d like to start with the implementation of the new
view mechanism during the next days. Since there still seems to be
some discussion related to the final requirements of the features that
should be supported in the end I’m going to start with a (hopefully)
less controversial part of the implementation that can be done mostly
independent from the rest of the views: The support for different
positions in different views.
This feature will be very important once we have views like swimlanes
which will give elements positions and dimensions that cannot be
shared with “conventional” views and therefore this information cannot
be shared between different views. Also, the user may want to arrange
elements in a more business oriented view in a different manner than
in a technical view (which often contains much more elements and may
require more space between the elements). Therefore, the model should
be able to store one position/dimension for each model element and
each view.
The proposed implementation consists of:
- Removing Point and Dimension from the View package
- Adding a ViewData element to the View Package with attributes
viewID, x, y, width, height
- Removing Location(Point) and Size(Dimension) from the GraphicalElement
- Adding ViewData as 0..* relationship to the GraphicalElement
- Adjusting the code, so the information in the ViewData element that
corresponds to the current view is used
- Sourcing out the storage of these elements into a new file (e.g.
*.workflowview) to prevent the core model file (*.workflow) from being
cluttered with view-specific information
- Other view specific information (like References and ReferenceEdges)
should also be put into this file
However, there are a few complications:
- This modification will cause incompatibility with the old file
format (as will do any modification of the metamodel which makes it
imcompatible with the previous one). We’ll need to implement
transformations that convert the old files to the new format (Florian
is already looking into this)
- If a view is used the first time, a dialog should be displayed to
let the user import the initial positions for the elements from
another view or use an automatic layouting algorithm
- It would probably also be nice if the positions of elements can be
synchronized between different views, so that if the user moves an
element in View1, it gets moved automatically to the same position in
View2 (basically an emulation of what we have now, which will be still
useful in some cases I guess)
As always, if someone has some suggestions or objections to this
proposal, please do not hesitate to answer.
Regards,
Christian
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Marc Blachon
Bull, Architect of an Open World TM
BPM Team, Bull R&D
1, rue de Provence
38130 Echirolles (France)
Direct Line: +33-4-76-29-74-80
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