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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_CUSTOM_LAYOUT_WORKLET_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_CUSTOM_LAYOUT_WORKLET_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/ng/custom/document_layout_definition.h"
#include "third_party/blink/renderer/core/layout/ng/custom/pending_layout_registry.h"
#include "third_party/blink/renderer/core/workers/worklet.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/supplementable.h"
namespace blink {
class Node;
class LayoutWorkletGlobalScopeProxy;
extern DocumentLayoutDefinition* const kInvalidDocumentLayoutDefinition;
// Manages a layout worklet:
// https://drafts.css-houdini.org/css-layout-api/#dom-css-layoutworklet
//
// Provides access to web developer defined layout classes within multiple
// global scopes.
class CORE_EXPORT LayoutWorklet : public Worklet,
public Supplement<LocalDOMWindow> {
USING_GARBAGE_COLLECTED_MIXIN(LayoutWorklet);
public:
static const char kSupplementName[];
// At the moment, layout worklet allows at most two global scopes at any time.
static const size_t kNumGlobalScopes;
static LayoutWorklet* From(LocalDOMWindow&);
explicit LayoutWorklet(LocalFrame*);
~LayoutWorklet() override;
typedef HeapHashMap<String, Member<DocumentLayoutDefinition>>
DocumentDefinitionMap;
DocumentDefinitionMap* GetDocumentDefinitionMap() {
return &document_definition_map_;
}
void AddPendingLayout(const AtomicString& name, Node*);
LayoutWorkletGlobalScopeProxy* Proxy();
void Trace(Visitor*) override;
protected:
// TODO(ikilpatrick): Make selection of the global scope non-deterministic.
wtf_size_t SelectGlobalScope() final { return 0u; }
private:
friend class LayoutWorkletTest;
// Implements Worklet.
bool NeedsToCreateGlobalScope() final;
WorkletGlobalScopeProxy* CreateGlobalScope() final;
DocumentDefinitionMap document_definition_map_;
Member<PendingLayoutRegistry> pending_layout_registry_;
DISALLOW_COPY_AND_ASSIGN(LayoutWorklet);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_CUSTOM_LAYOUT_WORKLET_H_
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