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Sam Atkins 02a369a0a3 Documentation: Add documentation for adding IDL files

There are several steps involved, which are not at all obvious unless
you already know them. So now they're written down. :^)

2021-10-04 15:32:27 +01:00

Adding a new IDL file

Serenity's build system does a lot of work of turning the IDL from a Web spec into code, but there are a few things you'll need to do yourself.

For the sake of example, let's say you're wanting to add the HTMLDetailsElement.

Create LibWeb/HTML/HTMLDetailsElement.idl with the contents of the IDL section of the spec. In this case, that would be:

[Exposed=Window]
interface HTMLDetailsElement : HTMLElement {
    [HTMLConstructor] constructor();

    [CEReactions] attribute boolean open;
};

If the IDL starts with [Exposed=Window], remove that line from the .idl file, and add the following to LibWeb/Bindings/WindowObjectHelper.h:
- #include <LibWeb/Bindings/HTMLDetailsElementConstructor.h> and
- #include <LibWeb/Bindings/HTMLDetailsElementPrototype.h> to the includes list.
- ADD_WINDOW_OBJECT_INTERFACE(HTMLDetailsElement) \ to the macro at the bottom.
Add a libweb_js_wrapper() call to LibWeb/CMakeLists.txt
Forward declare the generated classes in LibWeb/Forward.h:
- HTMLDetailsElement in its namespace.
- HTMLDetailsElementWrapper in the Web::Bindings namespace.
If your interface is an Event type:
- Add #import <DOM/Event.idl> at the top of the IDL file.
- Open LibWeb/Bindings/EventWrapperFactory.cpp and add an #include directive and if statement for your new Event type.