mirror of
https://github.com/RGBCube/serenity
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824be02cb0
This logic was kept in the GlobalEventHandlers mixing for sharing between Document and HTMLElement, but there are other interfaces who need to support `onfoo` attribute event listeners as well.
114 lines
4.2 KiB
C++
114 lines
4.2 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringBuilder.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/OrdinaryFunctionObject.h>
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#include <LibWeb/Bindings/ScriptExecutionContext.h>
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#include <LibWeb/DOM/Event.h>
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#include <LibWeb/DOM/EventListener.h>
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#include <LibWeb/DOM/EventTarget.h>
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#include <LibWeb/HTML/EventHandler.h>
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namespace Web::DOM {
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EventTarget::EventTarget(Bindings::ScriptExecutionContext& script_execution_context)
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: m_script_execution_context(&script_execution_context)
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{
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}
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EventTarget::~EventTarget()
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{
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}
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// https://dom.spec.whatwg.org/#add-an-event-listener
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void EventTarget::add_event_listener(const FlyString& event_name, RefPtr<EventListener> listener)
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{
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if (listener.is_null())
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return;
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auto existing_listener = m_listeners.first_matching([&](auto& entry) {
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return entry.listener->type() == event_name && &entry.listener->function() == &listener->function() && entry.listener->capture() == listener->capture();
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});
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if (existing_listener.has_value())
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return;
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listener->set_type(event_name);
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m_listeners.append({ event_name, listener.release_nonnull() });
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}
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// https://dom.spec.whatwg.org/#remove-an-event-listener
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void EventTarget::remove_event_listener(const FlyString& event_name, RefPtr<EventListener> listener)
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{
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if (listener.is_null())
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return;
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m_listeners.remove_first_matching([&](auto& entry) {
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auto matches = entry.event_name == event_name && &entry.listener->function() == &listener->function() && entry.listener->capture() == listener->capture();
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if (matches)
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entry.listener->set_removed(true);
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return matches;
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});
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}
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void EventTarget::remove_from_event_listener_list(NonnullRefPtr<EventListener> listener)
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{
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m_listeners.remove_first_matching([&](auto& entry) {
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return entry.listener->type() == listener->type() && &entry.listener->function() == &listener->function() && entry.listener->capture() == listener->capture();
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});
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}
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// https://dom.spec.whatwg.org/#dom-eventtarget-dispatchevent
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ExceptionOr<bool> EventTarget::dispatch_event_binding(NonnullRefPtr<Event> event)
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{
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if (event->dispatched())
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return DOM::InvalidStateError::create("The event is already being dispatched.");
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if (!event->initialized())
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return DOM::InvalidStateError::create("Cannot dispatch an uninitialized event.");
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event->set_is_trusted(false);
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return dispatch_event(event);
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}
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HTML::EventHandler EventTarget::event_handler_attribute(FlyString const& name)
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{
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for (auto& listener : listeners()) {
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if (listener.event_name == name && listener.listener->is_attribute()) {
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return HTML::EventHandler { JS::make_handle(&listener.listener->function()) };
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}
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}
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return {};
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}
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void EventTarget::set_event_handler_attribute(FlyString const& name, HTML::EventHandler value)
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{
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RefPtr<DOM::EventListener> listener;
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if (!value.callback.is_null()) {
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listener = adopt_ref(*new DOM::EventListener(move(value.callback)));
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} else {
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StringBuilder builder;
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builder.appendff("function {}(event) {{\n{}\n}}", name, value.string);
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auto parser = JS::Parser(JS::Lexer(builder.string_view()));
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auto program = parser.parse_function_node<JS::FunctionExpression>();
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if (parser.has_errors()) {
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dbgln("Failed to parse script in event handler attribute '{}'", name);
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return;
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}
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auto* function = JS::OrdinaryFunctionObject::create(script_execution_context()->interpreter().global_object(), name, program->body(), program->parameters(), program->function_length(), nullptr, JS::FunctionKind::Regular, false, false);
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VERIFY(function);
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listener = adopt_ref(*new DOM::EventListener(JS::make_handle(static_cast<JS::FunctionObject*>(function))));
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}
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if (listener) {
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for (auto& registered_listener : listeners()) {
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if (registered_listener.event_name == name && registered_listener.listener->is_attribute()) {
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remove_event_listener(name, registered_listener.listener);
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break;
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}
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}
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add_event_listener(name, listener.release_nonnull());
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}
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}
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}
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