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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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2
Libraries/LibWeb/Bindings/DocumentWrapper.h
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@ -40,7 +40,7 @@ public:
const Document& node() const;
private:
virtual const char* class_name() const override { return "Document"; }
virtual const char* class_name() const override { return "DocumentWrapper"; }
};
}

24
Libraries/LibWeb/Bindings/EventListenerWrapper.cpp Normal file
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@ -0,0 +1,24 @@
#include <LibJS/Runtime/Function.h>
#include <LibWeb/Bindings/EventListenerWrapper.h>
#include <LibWeb/DOM/EventListener.h>
namespace Web {
namespace Bindings {
EventListenerWrapper::EventListenerWrapper(EventListener& impl)
: m_impl(impl)
{
}
EventListenerWrapper::~EventListenerWrapper()
{
}
void EventListenerWrapper::visit_children(JS::Cell::Visitor& visitor)
{
Wrapper::visit_children(visitor);
visitor.visit(impl().function());
}
}
}

50
Libraries/LibWeb/Bindings/EventListenerWrapper.h Normal file
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@ -0,0 +1,50 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibWeb/Bindings/Wrapper.h>
namespace Web {
namespace Bindings {
class EventListenerWrapper final : public Wrapper {
public:
explicit EventListenerWrapper(EventListener&);
virtual ~EventListenerWrapper() override;
EventListener& impl() { return *m_impl; }
const EventListener& impl() const { return *m_impl; }
private:
virtual const char* class_name() const override { return "EventListenerWrapper"; }
virtual void visit_children(JS::Cell::Visitor&) override;
NonnullRefPtr<EventListener> m_impl;
};
}
}

33
Libraries/LibWeb/Bindings/EventTargetWrapper.cpp Normal file
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@ -0,0 +1,33 @@
#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()
{
}
}
}

49
Libraries/LibWeb/Bindings/EventTargetWrapper.h Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibWeb/Bindings/Wrapper.h>
namespace Web {
namespace Bindings {
class EventTargetWrapper : public Wrapper {
public:
explicit EventTargetWrapper(EventTarget&);
virtual ~EventTargetWrapper() override;
EventTarget& impl() { return *m_impl; }
const EventTarget& impl() const { return *m_impl; }
private:
virtual const char* class_name() const override { return "EventTargetWrapper"; }
NonnullRefPtr<EventTarget> m_impl;
};
}
}

12
Libraries/LibWeb/Bindings/NodeWrapper.cpp
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@ -33,7 +33,7 @@ namespace Web {
namespace Bindings {
NodeWrapper::NodeWrapper(Node& node)
: m_node(node)
: EventTargetWrapper(node)
{
put("nodeName", JS::js_string(heap(), node.tag_name()));
}
@ -42,5 +42,15 @@ NodeWrapper::~NodeWrapper()
{
}
Node& NodeWrapper::node()
{
return static_cast<Node&>(EventTargetWrapper::impl());
}
const Node& NodeWrapper::node() const
{
return static_cast<const Node&>(EventTargetWrapper::impl());
}
}
}

12
Libraries/LibWeb/Bindings/NodeWrapper.h
View file

@ -26,23 +26,21 @@
#pragma once
#include <LibWeb/Bindings/Wrapper.h>
#include <LibWeb/Bindings/EventTargetWrapper.h>
namespace Web {
namespace Bindings {
class NodeWrapper : public Wrapper {
class NodeWrapper : public EventTargetWrapper {
public:
explicit NodeWrapper(Node&);
virtual ~NodeWrapper() override;
Node& node() { return *m_node; }
const Node& node() const { return *m_node; }
Node& node();
const Node& node() const;
private:
virtual const char* class_name() const override { return "Node"; }
NonnullRefPtr<Node> m_node;
virtual const char* class_name() const override { return "NodeWrapper"; }
};
}