Widget Features API

[mlewand]

Are you reporting a feature request or a bug?

Feature request

Provide detailed reproduction steps (if any)

While working on Easy Image we had to create a few widget components/features that seemed reusable:

• caption - Simply a possibility to set a caption, displayed in a provided widget element. Such feature is already present in the image2 widget, it is also required by easyimage. I can see it being useful in case of table widget, where you could edit table <caption> element.
• linking integration - Integration with link plugin (it's commands). It's already used by image2.
• resizer - Currently present only in image2. I can see it working for many other plugins.
• drag handler - Currently available in widget core, should be extracted to a separate opt-in extension.

There are much more examples.

Having all that in mind it would be nice to create a reusable API.

I'll further update this issue with more details as we shape things up.

At this point we're experimenting with it as a part of Easy Image implementation, where widget feature API is provided by imagebase plugin. As we get closer to the final solution, we'll move it to core widget system.