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LibWeb: Basic implementation of global event handlers :^)

Document and HTMLElement now inherit from HTML::GlobalEventHandlers
which allows them to support "onfoo" event handler attributes.

These are assignable both via IDL attributes and content attributes.

Event listeners constructed this way get a special "attribute" flag
on them so we know which one to replace if you reassign them.
This also allows them to coexist with EventTarget.addEventListener().

This is all a bit sloppy, but it works decently for a first cut.
The Window object should also inherit GlobalEventHandlers, but since
we don't generate it from IDL, I haven't taken that step here.

Also this would be a lot nicer if we supported IDL mixins.
This commit is contained in:
Andreas Kling 2021-02-03 22:47:50 +01:00
parent b43db4cc50
commit a59b1825ce
15 changed files with 391 additions and 2 deletions

View file

@ -26,6 +26,9 @@
#pragma once
#include <AK/Forward.h>
#include <LibWeb/Forward.h>
#define ENUMERATE_GLOBAL_EVENT_HANDLERS(E) \
E(onabort, HTML::EventNames::abort) \
E(onauxclick, "auxclick") \
@ -93,3 +96,25 @@
E(onwebkitanimationstart, "webkitanimationstart") \
E(onwebkittransitionend, "webkittransitionend") \
E(onwheel, "wheel")
namespace Web::HTML {
class GlobalEventHandlers {
public:
virtual ~GlobalEventHandlers();
#undef __ENUMERATE
#define __ENUMERATE(attribute_name, event_name) \
void set_##attribute_name(HTML::EventHandler); \
HTML::EventHandler attribute_name();
ENUMERATE_GLOBAL_EVENT_HANDLERS(__ENUMERATE)
#undef __ENUMERATE
void set_event_handler_attribute(const FlyString& name, HTML::EventHandler);
HTML::EventHandler get_event_handler_attribute(const FlyString& name);
protected:
virtual DOM::EventTarget& global_event_handlers_to_event_target() = 0;
};
}