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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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43
Userland/Libraries/LibWeb/WebIDL/ObservableArray.h Normal file
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/*
* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/Array.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::WebIDL {
// https://webidl.spec.whatwg.org/#idl-observable-array
class ObservableArray final : public JS::Array {
public:
static JS::NonnullGCPtr<ObservableArray> create(JS::Realm& realm);
virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata* metadata = nullptr) override;
virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const& property_key) override;
using SetAnIndexedValueCallbackFunction = Function<ExceptionOr<void>(JS::Value&)>;
using DeleteAnIndexedValueCallbackFunction = Function<ExceptionOr<void>()>;
void set_on_set_an_indexed_value_callback(SetAnIndexedValueCallbackFunction&& callback);
void set_on_delete_an_indexed_value_callback(DeleteAnIndexedValueCallbackFunction&& callback);
JS::ThrowCompletionOr<void> append(JS::Value value);
void clear();
explicit ObservableArray(Object& prototype);
virtual void visit_edges(JS::Cell::Visitor&) override;
private:
using SetAnIndexedValueCallbackHeapFunction = JS::HeapFunction<SetAnIndexedValueCallbackFunction::FunctionType>;
using DeleteAnIndexedValueCallbackHeapFunction = JS::HeapFunction<DeleteAnIndexedValueCallbackFunction::FunctionType>;
JS::GCPtr<SetAnIndexedValueCallbackHeapFunction> m_on_set_an_indexed_value;
JS::GCPtr<DeleteAnIndexedValueCallbackHeapFunction> m_on_delete_an_indexed_value;
};
}