[Feature request] quick move for ghost items via shift-click

[Mithi83]

EMI offers the EmiDragDropHandler API for moving ghost items into appropriate slots via drag & drop. I'd like to propose adding another API that does something similar but without requiring drag & drop.

My background and use case: AE2 allows setting up filtering for certain items, such as partitioning storage cells, filtering import & export busses etc. These filters can be set using different methods:

• Clicking with an item in hand on the filter slot
• Drag & drop from EMI
• Quick move (shift-click) from player inventory

A typical storage cell can have up to 63 filter slots and filling them one by one with drag & drop from EMI is a tedious and error-prone process. Allowing to shift-click ghost items from EMI directly would greatly speed up the process and other mods could also benefit from such a feature.

I've implemented a quick and dirty proof of concept both on the EMI and the AE2 side of things to make a video of the use case. In the video you can first see the manual drag & drop approach, then the new keybind and at last the newer and faster shift-click variant:

quick-move.mp4

My quick and dirty approach for the proof of concept on the EMI side can be seen here (Mithi83@1c99ec0) and it involves:

• Adding a keybind for the quick move (shift + left click)
• Adding a new else if in EmiScreenManager.stackInteraction to handle the
  new keybind
• Abusing the existing EmiDragDropHandlers.dropStack API with x=9999 and y=9999 to transport the information that it should be considered a quick move rather than a real drag & drop operation across the API and into AE2

Now I'm wondering how to make this proof of concept into a proper feature. Since I'm not that familiar with designing APIs in Java (in particular the backward compatibility question) I've decided to make it a feature request to discuss it rather than just posting a pull request.

Since the feature is very similar to the drag & drop approach my first idea was to add another function to EmiDragDropHandler along the lines of boolean quickMoveStack(T screen, EmiIngredient stack). There are some questions or drawbacks however:

• The name EmiDragDropHandler does not cover quick move.
• I'm not sure if this would affect backwards compatibility of existing users of that API if there was a default boolean quickMoveStack(T screen, EmiIngredient stack) { return false; } in there.
• I'm not sure what would be a good wording for that feature. In my mind 'quick move' sounds good, but I'm not sure if that is the official terminology here.

The alternative would be a separate class for the API, e.g. EmiQuickMoveHandler which would probably avoid these problems. Either way I'd be willing to provide a pull request if a lack of time on your end would be the bottleneck here once the basic questions have been answered. Thanks for your time and a great mod.