a59b1825ce
Document and HTMLElement now inherit from HTML::GlobalEventHandlers which allows them to support "onfoo" event handler attributes. These are assignable both via IDL attributes and content attributes. Event listeners constructed this way get a special "attribute" flag on them so we know which one to replace if you reassign them. This also allows them to coexist with EventTarget.addEventListener(). This is all a bit sloppy, but it works decently for a first cut. The Window object should also inherit GlobalEventHandlers, but since we don't generate it from IDL, I haven't taken that step here. Also this would be a lot nicer if we supported IDL mixins.
99 lines
4.3 KiB
C++
99 lines
4.3 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/ScriptFunction.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/EventListener.h>
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#include <LibWeb/HTML/EventHandler.h>
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#include <LibWeb/HTML/EventNames.h>
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#include <LibWeb/HTML/GlobalEventHandlers.h>
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#include <LibWeb/UIEvents/EventNames.h>
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namespace Web::HTML {
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#undef __ENUMERATE
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#define __ENUMERATE(attribute_name, event_name) \
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void GlobalEventHandlers::set_##attribute_name(HTML::EventHandler value) \
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{ \
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set_event_handler_attribute(event_name, move(value)); \
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} \
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HTML::EventHandler GlobalEventHandlers::attribute_name() \
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{ \
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return get_event_handler_attribute(event_name); \
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}
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ENUMERATE_GLOBAL_EVENT_HANDLERS(__ENUMERATE)
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#undef __ENUMERATE
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GlobalEventHandlers::~GlobalEventHandlers()
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{
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}
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void GlobalEventHandlers::set_event_handler_attribute(const FlyString& name, HTML::EventHandler value)
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{
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auto& self = global_event_handlers_to_event_target();
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RefPtr<DOM::EventListener> listener;
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if (!value.callback.is_null()) {
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listener = adopt(*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::ScriptFunction::create(self.script_execution_context()->interpreter().global_object(), name, program->body(), program->parameters(), program->function_length(), nullptr, false, false);
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ASSERT(function);
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listener = adopt(*new DOM::EventListener(JS::make_handle(static_cast<JS::Function*>(function))));
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}
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if (listener) {
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for (auto& registered_listener : self.listeners()) {
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if (registered_listener.event_name == name && registered_listener.listener->is_attribute()) {
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self.remove_event_listener(name, registered_listener.listener);
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break;
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}
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}
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self.add_event_listener(name, listener.release_nonnull());
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}
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}
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HTML::EventHandler GlobalEventHandlers::get_event_handler_attribute(const FlyString& name)
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{
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auto& self = global_event_handlers_to_event_target();
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for (auto& listener : self.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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}
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