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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/DOM/EventTarget.h
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@ -51,7 +51,7 @@ public:
void remove_from_event_listener_list(NonnullRefPtr<EventListener>);
virtual bool dispatch_event(NonnullRefPtr<Event>) = 0;
virtual Bindings::EventTargetWrapper* create_wrapper(JS::GlobalObject&) = 0;
virtual JS::Object* create_wrapper(JS::GlobalObject&) = 0;
Bindings::ScriptExecutionContext* script_execution_context() { return m_script_execution_context; }
virtual EventTarget* get_parent(const Event&) { return nullptr; }