Reply to: Disable Drag&Drop for Images in XMAXJune 14, 2017 at 2:55 am
I put together a HTML sample to try this out and I am seeing the same behavior as you (re: OnDragOver and OnDrop event sinks are NOT called).
So, I started up the debugger and internally, XMAX (and Author) handles this kind of drag'n'drop using the Windows WM_DROPFILES message. The code will fire the On_Drop_Files event macro, if present, to permit hooking into this behavior. XMAX cannot fully utilize this event macro because certain APIs are missing (re: Application.DropFileCount and Application.DropFileName). Nevertheless, there is a way to disable this functionality by adding an empty doc-level “On_Drop_Files” event macro to your customization's *.mcr file. Two caveats:
1. This disables dropping of ALL file types into the XMAX window.
2. The system still shows the drop cursor as a plus sign indicating the drop is allowed (eventhough nothing happens later).