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LibWeb/WebIDL: Introduce ObservableArray

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ObservableArray inherits from JS::Array and overrides `internal_set`
and `internal_delete` to run an interceptor callback when an indexed
item is added or deleted.
This commit is contained in:
Aliaksandr Kalenik 2024-03-07 23:29:25 +01:00 • committed by Andreas Kling
parent 75a8d37c99
commit fceba6a257
4 changed files with 114 additions and 1 deletions
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69
Userland/Libraries/LibWeb/WebIDL/ObservableArray.cpp Normal file
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/*
* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/WebIDL/ObservableArray.h>
namespace Web::WebIDL {
JS::NonnullGCPtr<ObservableArray> ObservableArray::create(JS::Realm& realm)
{
auto prototype = realm.intrinsics().array_prototype();
return realm.heap().allocate<ObservableArray>(realm, prototype);
}
ObservableArray::ObservableArray(Object& prototype)
: JS::Array(prototype)
{
}
void ObservableArray::visit_edges(JS::Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_on_set_an_indexed_value);
visitor.visit(m_on_delete_an_indexed_value);
}
void ObservableArray::set_on_set_an_indexed_value_callback(SetAnIndexedValueCallbackFunction&& callback)
{
m_on_set_an_indexed_value = create_heap_function(heap(), move(callback));
}
void ObservableArray::set_on_delete_an_indexed_value_callback(DeleteAnIndexedValueCallbackFunction&& callback)
{
m_on_delete_an_indexed_value = create_heap_function(heap(), move(callback));
}
JS::ThrowCompletionOr<bool> ObservableArray::internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata* metadata)
{
if (property_key.is_number() && m_on_set_an_indexed_value)
TRY(Bindings::throw_dom_exception_if_needed(vm(), [&] { return m_on_set_an_indexed_value->function()(value); }));
return TRY(Base::internal_set(property_key, value, receiver, metadata));
}
JS::ThrowCompletionOr<bool> ObservableArray::internal_delete(JS::PropertyKey const& property_key)
{
if (property_key.is_number() && m_on_delete_an_indexed_value)
TRY(Bindings::throw_dom_exception_if_needed(vm(), [&] { return m_on_delete_an_indexed_value->function()(); }));
return JS::Array::internal_delete(property_key);
}
JS::ThrowCompletionOr<void> ObservableArray::append(JS::Value value)
{
if (m_on_set_an_indexed_value)
TRY(Bindings::throw_dom_exception_if_needed(vm(), [&] { return m_on_set_an_indexed_value->function()(value); }));
indexed_properties().append(value);
return {};
}
void ObservableArray::clear()
{
while (!indexed_properties().is_empty()) {
indexed_properties().storage()->take_first();
}
}
}