Precondition:
The user has opened the app on a key-controlled device and, on one of his maps, made a selection of elements that he wants to copy and paste into that same map.
Main success scenario:
The user copies the selection by pressing CTRL-C.
The user goes into insert mode by pressing CTRL-V.
The user pastes the selection of elements in the map by clicking.
By closing the status panel or pressing ESC, the user leaves the insert mode.
Alternative scenarios:
The user pastes a copied selection while having other element(s) currently selected.
The element(s) get unselected.
The user pastes a copied selection having the wrong layer selected and a warning appears advising the correct layer.
The user selects the correct layer and successfully pastes that selection of elements into it.
The user presses CTRL-C without having anything selected.
The user presses CTRL-V and no pasting happens because no elements have been copied.
In a step #1, the user presses CTRL-C on a selection of elements.
In a step #2, The user unselects that selection by clicking anywhere else on the map.
The user presses CTRL-C without having anything selected.
The user presses CTRL-V.
The, in step #1, copied selection of elements is pasted into the map, placed where the user clicked in step #2 to unselect the copied elements.
The user pastes a wrongly chosen selection of elements.
The user uses the app's undo function to revert the pasting.
Error scenarios:
The user attempts to copy and paste a selection but the app is experiencing technical difficulties and is unable to complete the request, displaying an error message.
Postconditions:
The user's map contains the copied and pasted selection of elements.
Non-functional Constraints:
Alternatives (selected elements depend on which alternative layer is selected)
Any copy & pasted element should have its own UUID in the map, i.e. it's a unique Konva node on the current canvas.
Left-click, middle-click and right-click should be accepted for setting the target position of the next pasting.
The shortcuts for copying and pasting (CTRL-C and CTRL-V) should be stored in a central place where future keybindings will be added too.
(this usecase) Copy & Paste of Selection Within the Same Map
This usecase should be done before any other Copy & Paste-related usecase.
It will contain the core logic of copying and pasting.
Copy & Paste of Selection via Icons
It can reuse everything implemented in the first usecase one-to-one.
Additionally it will add the logically-isolated possibility to copy and paste via icons plus the 'visibility-toggling' of the copy- and paste-icons' design.