Commit aa3f0f53 authored by David Edmundson's avatar David Edmundson
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Add some hopefully useful documentation for people creating new interfaces

The generated classes don't really have documentation for the generated
methods. This hopes to provide some context.
parent 0c8b77ed
# History
We started out with one method of generting classes. We then ported to a new approach of using QtWaylandScanner to reduce a lot of boiler plate.
New classes should use the new approach.
# New Approach
A public facing PIMPL class which should inherit from QObject.
A private class that should inherit from QtWaylandServer::interface_name which is auto-generated. This will manage individual resources, handle callbacks and QString conversions.
Class Names should map to the interface name in UpperCamelCase.
Where a V1 exists in the interface name, this should be mirrored in the file and class name.
An implementation should handle all versions of a given interface, but not different interfaces which represent different versions.
(i.e zxdg_output_manager_v1 versions 1 2 and 3 would be wrapped in one class XdgOutputManagerV1Interface. A zxdg_output_manager_v2 protocol would be exposed as a new public class XdgOutputManagerV2Interface)
# Implementations
There are 3 modes of operation happening within the exported classes of KWaylandServer
The generated classes can behave in all these modes, it is up to our implementation to use the correct methods.
## Globals
e.g BlurManager
This represents an object listed by the Display class.
Use the interface_name::(wl_display*, int version) constructor within the private class to create an instance.
## Server-managed multicasting resources
e.g XdgOutput
This is where one QObject represents multiple Resources.
Use the method
QtWaylandServer::interface_name::add(client, id, version)
to create a a new Resource instance managed by this object.
Use the event method with the wl_resource* overload to send events.
for (auto resource : resourceMap())
send_some_method(resource->handle, arg1, arg2);
methods to send requests to all clients.
## Client-owned Resources:
e.g BlurInterface
This is where one instance of our public class represents a single resource. Typically the lifespan of the exported class matches our resource.
In the private class use the QtWaylandServer::interface_name(wl_resource*) constructor to create a wrapper bound to a specific resource.
send_some_method(arg1, args2)
methods of the privateClass to send events to the resource set in the constructor
## Other hooks
`_bind_resource` is called whenever a resource is bound. This exists for all generated classes in all the operating modes
`_destroy_resource` is a hook called whenever a resource has been unbound.
Note one should not call wl_resource_destroy in this hook.
## Resource destructors
destructors (tagged with type="destructor" in the XML) are not handled specially in QtWayland it is up to the class implementation to implement the event handler and call
in the relevant method
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