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LibWeb: Start working on DOM event support

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This patch adds the EventTarget class and makes Node inherit from it.

You can register event listeners on an EventTarget, and when you call
dispatch_event() on it, the event listeners will get invoked.

An event listener is basically a wrapper around a JS::Function*.

This is pretty far from how DOM events should eventually work, but it's
a place to start and we'll build more on top of this. :^)
This commit is contained in:
Andreas Kling 2020-03-18 15:22:31 +01:00
parent 97674da502
commit f39e5352f0
17 changed files with 310 additions and 11 deletions
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33
Libraries/LibWeb/Bindings/EventTargetWrapper.cpp Normal file
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#include <AK/Function.h>
#include <LibJS/Runtime/Function.h>
#include <LibWeb/Bindings/EventListenerWrapper.h>
#include <LibWeb/Bindings/EventTargetWrapper.h>
#include <LibWeb/DOM/EventListener.h>
#include <LibWeb/DOM/EventTarget.h>
namespace Web {
namespace Bindings {
EventTargetWrapper::EventTargetWrapper(EventTarget& impl)
: m_impl(impl)
{
put_native_function("addEventListener", [](Object* this_object, const Vector<JS::Value>& arguments) {
if (arguments.size() < 2)
return JS::js_undefined();
auto event_name = arguments[0].to_string();
ASSERT(arguments[1].is_object());
ASSERT(arguments[1].as_object()->is_function());
auto listener = adopt(*new EventListener(static_cast<JS::Function*>(const_cast<Object*>(arguments[1].as_object()))));
wrap(this_object->heap(), *listener);
static_cast<EventTargetWrapper*>(this_object)->impl().add_event_listener(event_name, move(listener));
return JS::js_undefined();
});
}
EventTargetWrapper::~EventTargetWrapper()
{
}
}
}