Hi, On Wednesday, 30 September 2015, Carlos Garnacho <carl...@gnome.org> wrote:
> These 2 requests have been added: > > - wl_data_source.set_actions: Notifies the compositor of the available > actions on the data source. > - wl_data_offer.set_actions: Notifies the compositor of the available > actions on the destination side, plus the preferred action. > > Out of the data from these requests, the compositor can determine the > action > both parts agree on (and let the user play a role through eg. keyboard > modifiers). The chosen option will be notified to both parties > through the following two requests: > > - wl_data_source.action > - wl_data_offer.action > > In addition, the destination side can peek the source side actions through > wl_data_offer.source_actions. > > Compared to the XDND protocol, there's two notable changes: > > - XDND lets the source suggest an action, whereas wl_data_device lets > the destination prefer a given action. The difference is subtle here, > it comes off as convenience because it is the drag destination which > receives the motion events (unlike in X) and can perform action updates. > > The drag destination seems also in a better position to update the > preferred action based on things like the data being transferred, the > place being dropped, and whether the drag is client-local. > > - That same source-side preferred action is used in XDND to convey the > modifier-induced action to the drag destination, which would then ack > it, or reply with another action that's accepted (or none), this makes > the XdndPosition/XdndStatus messaging very verbose, and synchronous > because the drag source always needs to know the latest status/action > for every position+action sent. > > Here it's the compositor which takes care of modifiers and matching > available/accepted actions, this allows for the signaling to happen > only whenever the actions/modifiers change for real. > > Roughly based on previous work by Giulio Camuffo <giuliocamu...@gmail.com > <javascript:;>> > Mike had a look at this from EFL - CCing him. Cheers, Daniel
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