FWD » Core Development » User Interface

CLIPBOARD system handle and all used attrs/methods + general runtime support

Some things to note:

1. ChUI does support use of the CLIPBOARD system handle (including the VALUE attribute for both reading and writing). However, there is no system clipboard in this case. The 4GL has its own private/process-internal clipboard that is used. We will need to investigate how much of the MULTIPLE and type support is functional.

2. ChUI has some kind of support for CUT (default key function mapped to F10), COPY (default key function mapped to F11) and PASTE (default key function mapped to F12). I could get these to fire a trigger, but I could not get data from the clipboard into a fill-in or editor. One might thing that there would have to be a current selection for copy or cut to work. The selection-start and selection-end attributes are read-only. At this point we don't know how to make a selection through the user interface. I wonder if we could make that work, if copy/cut would then work. Anyway, this needs more research. They must have some kind of function, otherwise why is the support there?

Both of these things are partially illustrated by testcases/uast/clipboard/clipboard_basic.p.

Task #3120 has been created for the ChUI implementation (which will provide an "internal" clipboard).

Basic support for the CLIPBOARD system handle and for the get/set of the VALUE attribute in GUI has been implemented in task branch 3084a as part of #3080.