Most compositors send the wl_data_offer.source_actions event before the wl_data_device.enter event, i.e. after creation of the data offer. This contradicts to the wayland spec. On the other hand, it's reasonable to send all the information useful to the client before the enter event, rather than send mime types before the enter event and source actions (that don't depend on drop target) after the enter event. On the client side, toolkits such as Qt and GTK already expect to see the source actions before receiving the enter event. Given all of that, this change adjusts the spec to match the behavior observed in the compositors in the wild. Signed-off-by: Vlad Zahorodnii <vlad.zahorodnii@kde.org> |
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Wayland
Wayland is a project to define a protocol for a compositor to talk to its clients as well as a library implementation of the protocol. The compositor can be a standalone display server running on Linux kernel modesetting and evdev input devices, an X application, or a wayland client itself. The clients can be traditional applications, X servers (rootless or fullscreen) or other display servers.
The wayland protocol is essentially only about input handling and buffer management. The compositor receives input events and forwards them to the relevant client. The clients creates buffers and renders into them and notifies the compositor when it needs to redraw. The protocol also handles drag and drop, selections, window management and other interactions that must go through the compositor. However, the protocol does not handle rendering, which is one of the features that makes wayland so simple. All clients are expected to handle rendering themselves, typically through cairo or OpenGL.
Building the wayland libraries is fairly simple, aside from libffi, they don't have many dependencies:
$ git clone https://gitlab.freedesktop.org/wayland/wayland
$ cd wayland
$ meson build/ --prefix=PREFIX
$ ninja -C build/ install
where PREFIX is where you want to install the libraries.
See https://wayland.freedesktop.org for documentation.