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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_CUSTOM_CSS_LAYOUT_DEFINITION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CSS_LAYOUT_DEFINITION_H_
#include "third_party/blink/renderer/core/css/cssom/css_style_value.h"
#include "third_party/blink/renderer/core/css_property_names.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
#include "third_party/blink/renderer/platform/bindings/scoped_persistent.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_member.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "v8/include/v8.h"
namespace blink {
class FragmentResultOptions;
class LayoutCustom;
class ScriptState;
class SerializedScriptValue;
// Represents a javascript class registered on the LayoutWorkletGlobalScope by
// the author.
// https://drafts.css-houdini.org/css-layout-api/#layout-definition
class CSSLayoutDefinition final
: public GarbageCollectedFinalized<CSSLayoutDefinition>,
public NameClient {
public:
CSSLayoutDefinition(
ScriptState*,
v8::Local<v8::Function> constructor,
v8::Local<v8::Function> intrinsic_sizes,
v8::Local<v8::Function> layout,
const Vector<CSSPropertyID>& native_invalidation_properties,
const Vector<AtomicString>& custom_invalidation_properties,
const Vector<CSSPropertyID>& child_native_invalidation_properties,
const Vector<AtomicString>& child_custom_invalidation_properties);
virtual ~CSSLayoutDefinition();
// This class represents an instance of the layout class defined by the
// CSSLayoutDefinition.
class Instance final : public GarbageCollectedFinalized<Instance> {
public:
Instance(CSSLayoutDefinition*, v8::Local<v8::Object> instance);
// Runs the web developer defined layout, returns true if everything
// succeeded. It populates the FragmentResultOptions dictionary, and
// fragment_result_data.
bool Layout(const LayoutCustom&,
FragmentResultOptions*,
scoped_refptr<SerializedScriptValue>* fragment_result_data);
void Trace(blink::Visitor*);
private:
void ReportException(ExceptionState*);
Member<CSSLayoutDefinition> definition_;
ScopedPersistent<v8::Object> instance_;
};
// Creates an instance of the web developer defined class. May return a
// nullptr if constructing the instance failed.
Instance* CreateInstance();
const Vector<CSSPropertyID>& NativeInvalidationProperties() const {
return native_invalidation_properties_;
}
const Vector<AtomicString>& CustomInvalidationProperties() const {
return custom_invalidation_properties_;
}
const Vector<CSSPropertyID>& ChildNativeInvalidationProperties() const {
return child_native_invalidation_properties_;
}
const Vector<AtomicString>& ChildCustomInvalidationProperties() const {
return child_custom_invalidation_properties_;
}
ScriptState* GetScriptState() const { return script_state_; }
v8::Local<v8::Function> LayoutFunctionForTesting(v8::Isolate* isolate) {
return layout_.NewLocal(isolate);
}
virtual void Trace(blink::Visitor* visitor);
const char* NameInHeapSnapshot() const override {
return "CSSLayoutDefinition";
}
private:
Member<ScriptState> script_state_;
// This object keeps the class instances, constructor function, intrinsic
// sizes function, and layout function alive. It participates in wrapper
// tracing as it holds onto V8 wrappers.
TraceWrapperV8Reference<v8::Function> constructor_;
TraceWrapperV8Reference<v8::Function> intrinsic_sizes_;
TraceWrapperV8Reference<v8::Function> layout_;
// If a constructor call ever fails, we'll refuse to create any more
// instances of the web developer provided class.
bool constructor_has_failed_;
Vector<CSSPropertyID> native_invalidation_properties_;
Vector<AtomicString> custom_invalidation_properties_;
Vector<CSSPropertyID> child_native_invalidation_properties_;
Vector<AtomicString> child_custom_invalidation_properties_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CSS_LAYOUT_DEFINITION_H_
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