On Fri, 22 Oct 2021 17:32:10 GMT, Martin Fox <d...@openjdk.java.net> wrote:
> During a drag-and-drop operation on the Mac the Command key will filter out > every drag source operation except `NSDragOperationGeneric` (this behavior is > provided by the OS). JavaFX drag sources only set the Move, Copy, and Link > drag operation bits so the Command key reduces the set of available > operations to nothing. > > This PR changes nothing about how JavaFX behaves when the dnd operation > involves an external application. As a drag source the same set of operations > will be broadcast and as a drag destination the operations will be > interpreted as they have always been. > > For internal dnd within the JavaFX app `NSDragOperationMove` and > `NSDragOperationGeneric` will both be set if the drag source specifies > `TransferMode.MOVE`. On the other end a drag destination will interpret > `NSDragOperationGeneric` and `NSDragOperationMove` as synonyms. > > As part of this PR it was necessary to verify that `NSDragOperationGeneric` > was not already being used during an internal drag operation. There's a > clause in `mapJavaMaskToNsOperation:` which translates > `com_sun_glass_ui_Clipboard_ACTION_ANY` to `NSDragOperationEvery` and this > includes the Generic bit. I believe this is a red herring, the Java dnd code > converts `TransferMode.ANY` to a bitwise-OR of COPY, MOVE, and REFERENCE so > `com_sun_glass_ui_Clipboard_ACTION_ANY` will never be passed down to the > platform level. The fix looks good to me, too. ------------- Marked as reviewed by kcr (Lead). PR: https://git.openjdk.java.net/jfx/pull/651
