Support for earliestStart and latestEnd constraints.

[lokkilok]

Support for constraints on the start and end of an event while creating or resizing it by dragging. To use the application should in its event-create handler set a constraints property on the (returned) event.
This property should be an object with:

• earliestStart, optional, the earliest allowed start Date for the event
• latestEnd, optional, the latest allowed end Date for the event

For example to restrict events to a maximum length of 90 minutes the event-create handler could be like:

addEvent (ev) {
  ev.constraints = {
    latestEnd: ev.start.addMinutes(90)
  }
  return ev
}

[antoniandre]

Hi @lokkilok, thanks a lot for your contribution! I really like the idea.

Could you develop more on which constraints you think could be set?
It would be great to have a min and max (dates) in the constraints to be consistent with the existing min/max options, as well as a minDuration maxDuration maybe.

If you think you can refactor a bit to handle it (and also handle dragging from bottom to top) it would be a great help to move forward the merge of the PR!

If not no problem, I'll see when I have a little more time. :)

[lokkilok]

Sorry for the late reply, didn't get notified about your comment....

I made a reservation system where users reserve, or "book", resources. So when the user starts to add a reservation we know when that resource is available: between when the previous reservation ends, and when the next reservation starts. But in addition we have more restrictions, such as having 5 minutes between reservation and a maximum duration. Hence the idea of setting such constraints explicitly, right when the event is created and dragging begins.

I'll see if I find time to add dragging from bottom to top next week....

[vesper8]

@lokkilok Any chance your reservation system is open-source and available on Github? I also want to build a reservation system using vue-cal and would love to use your work as a foundation if possible. Thanks!