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LibWeb: Basic implementation of global event handlers :^)

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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.
This commit is contained in:
Andreas Kling 2021-02-03 22:47:50 +01:00
parent b43db4cc50
commit a59b1825ce
15 changed files with 391 additions and 2 deletions
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17
Userland/Libraries/LibWeb/CodeGenerators/WrapperGenerator.cpp
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@ -904,6 +904,7 @@ void generate_prototype_implementation(const IDL::Interface& interface)
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/EventListener.h>
#include <LibWeb/DOM/Window.h>
#include <LibWeb/HTML/EventHandler.h>
#include <LibWeb/HTML/HTMLElement.h>
#include <LibWeb/NavigationTiming/PerformanceTiming.h>
#include <LibWeb/Origin.h>
@ -1096,6 +1097,18 @@ static @fully_qualified_name@* impl_from(JS::VM& vm, JS::GlobalObject& global_ob
auto @cpp_name@ = @js_name@@js_suffix@.to_u32(global_object);
if (vm.exception())
@return_statement@
)~~~");
} else if (parameter.type.name == "EventHandler") {
// x.onfoo = function() { ... }
scoped_generator.append(R"~~~(
HTML::EventHandler @cpp_name@;
if (@js_name@@js_suffix@.is_function()) {
@cpp_name@.callback = JS::make_handle(&@js_name@@js_suffix@.as_function());
} else if (@js_name@@js_suffix@.is_string()) {
@cpp_name@.string = @js_name@@js_suffix@.as_string().string();
} else {
@return_statement@
}
)~~~");
} else {
dbgln("Unimplemented JS-to-C++ conversion: {}", parameter.type.name);
@ -1173,6 +1186,10 @@ static @fully_qualified_name@* impl_from(JS::VM& vm, JS::GlobalObject& global_ob
} else if (return_type.name == "Uint8ClampedArray") {
scoped_generator.append(R"~~~(
return retval;
)~~~");
} else if (return_type.name == "EventHandler") {
scoped_generator.append(R"~~~(
return retval.callback.cell();
)~~~");
} else {
scoped_generator.append(R"~~~(