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LibWeb: Make the Window object "inherit" from EventTarget :^)

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Since Web::Bindings::WindowObject inherits from JS::GlobalObject, it
cannot also inherit from Web::Bindings::EventTargetWrapper.

However, that's not actually necessary. Instead, we simply set the
Window object's prototype to the EventTargetPrototype, and add a little
extra branch in the impl_from() function that turns the JS "this" value
into a DOM::EventTarget*.

With this, you can now call window.addEventListener()! Very cool :^)

Fixes #4758.
This commit is contained in:
Andreas Kling 2021-01-18 12:15:02 +01:00
parent fd83918476
commit 0639e77898
13 changed files with 26 additions and 14 deletions
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2
Userland/Libraries/LibWeb/Bindings/EventTargetWrapperFactory.cpp
View file

@ -29,7 +29,7 @@
namespace Web::Bindings {
EventTargetWrapper* wrap(JS::GlobalObject& global_object, DOM::EventTarget& target)
JS::Object* wrap(JS::GlobalObject& global_object, DOM::EventTarget& target)
{
return target.create_wrapper(global_object);
}

2
Userland/Libraries/LibWeb/Bindings/EventTargetWrapperFactory.h
View file

@ -31,6 +31,6 @@
namespace Web::Bindings {
EventTargetWrapper* wrap(JS::GlobalObject&, DOM::EventTarget&);
JS::Object* wrap(JS::GlobalObject&, DOM::EventTarget&);
}

2
Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
View file

@ -67,6 +67,8 @@ void WindowObject::initialize()
{
GlobalObject::initialize();
set_prototype(&ensure_web_prototype<EventTargetPrototype>("EventTarget"));
define_property("window", this, JS::Attribute::Enumerable);
define_property("frames", this, JS::Attribute::Enumerable);
define_property("self", this, JS::Attribute::Enumerable);