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ladybird/Libraries/LibWeb/HTML/GlobalEventHandlers.cpp

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LibWeb: Basic implementation of global event handlers :^) 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.
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/*
Meta: Update my e-mail address everywhere
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* Copyright (c) 2021, Andreas Kling <andreas@ladybird.org>
LibWeb: Basic implementation of global event handlers :^) 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.
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibWeb: Basic implementation of global event handlers :^) 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.
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*/
LibWeb: Implement WindowEventHandlers
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#include <LibWeb/DOM/EventTarget.h>
LibWeb: Basic implementation of global event handlers :^) 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.
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#include <LibWeb/HTML/EventNames.h>
#include <LibWeb/HTML/GlobalEventHandlers.h>
#include <LibWeb/UIEvents/EventNames.h>
namespace Web::HTML {
#undef __ENUMERATE
LibWeb: Ignore window-forwarded document.body.onfoo in detached DOM Normally, assigning to e.g document.body.onload will forward to window.onload. However, in a detached DOM tree, there is no associated window, so we have nowhere to forward to, making this a no-op. The bulk of this change is making Document::window() return a nullable pointer, as documents created by DOMParser or DOMImplementation do not have an associated window object, and so must be able to return null from here.
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#define __ENUMERATE(attribute_name, event_name) \
void GlobalEventHandlers::set_##attribute_name(WebIDL::CallbackType* value) \
{ \
if (auto event_target = global_event_handlers_to_event_target(event_name)) \
event_target->set_event_handler_attribute(event_name, value); \
} \
WebIDL::CallbackType* GlobalEventHandlers::attribute_name() \
{ \
if (auto event_target = global_event_handlers_to_event_target(event_name)) \
return event_target->event_handler_attribute(event_name); \
return nullptr; \
LibWeb: Basic implementation of global event handlers :^) 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.
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}
ENUMERATE_GLOBAL_EVENT_HANDLERS(__ENUMERATE)
#undef __ENUMERATE
Libraries: Use default constructors/destructors in LibWeb https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
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GlobalEventHandlers::~GlobalEventHandlers() = default;
Meta: Enforce newlines around namespaces This has come up several times during code review, so let's just enforce it using a new clang-format 20 option.
2025-05-13 07:06:33 -04:00
LibWeb: Basic implementation of global event handlers :^) 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.
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}
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