bpmn-io/bpmn-js

I can model a message element of a message flow

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#447 opened on Jan 13, 2016

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Description

Is your feature request related to a problem? Please describe.

Messages can be used as graphical decorators, according to the BPMN 2.0 standard

image

One use case is to attach them to message flows

image

Currently, we render those message elements, but without it's name (cf. #777). However, it should be possible to model some in a diagram.

Describe the solution you'd like

It should be possible to model a message element for a given message flow. It should be possible to give a message element a name.

Describe alternatives you've considered

Consider the fact that message flows also can have labels and it should be avoided to have 2 labels at the end (one for the connection and one for the message element).

Additional context

It might be difficult to determine the position of the marker, since this is not reflected in the DI, as far as I know. Some auto-positioning logic would be sufficient as a first stept (e.g. positioning is always in the middle)

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
BPMN 2.0 basicsJavaScriptbpmn js modeling API
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the bpmn js modeling code to add a new element type for message elements on message flows. Study how other decorators are implemented, such as association or text annotations. Implement the modeling logic and ensure proper rendering with auto positioning. Consider the existing label handling for message flows to avoid duplication. Refer to issue #777 for the rendering of message elements without names.