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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_CUSTOM_LAYOUT_CHILD_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CUSTOM_LAYOUT_CHILD_H_
#include "third_party/blink/renderer/core/css/cssom/prepopulated_computed_style_property_map.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class CSSLayoutDefinition;
class CustomLayoutConstraintsOptions;
class CustomLayoutFragmentRequest;
class LayoutBox;
// Represents a "CSS box" for use by a web developer. This is passed into the
// web developer defined layout and intrinsicSizes functions so that they can
// perform layout on these children.
//
// The represent all inflow children, out-of-flow children (fixed/absolute) do
// not appear in the children list.
class CustomLayoutChild : public ScriptWrappable {
DEFINE_WRAPPERTYPEINFO();
public:
CustomLayoutChild(const CSSLayoutDefinition&, LayoutBox*);
~CustomLayoutChild() override = default;
// LayoutChild.idl
PrepopulatedComputedStylePropertyMap* styleMap() const { return style_map_; }
CustomLayoutFragmentRequest* layoutNextFragment(
ScriptState*,
const CustomLayoutConstraintsOptions&,
ExceptionState&);
LayoutBox* GetLayoutBox() const {
DCHECK(box_);
return box_;
}
void ClearLayoutBox() { box_ = nullptr; }
// A layout child may be invalid if it has been removed from the tree (it is
// possible for a web developer to hold onto a LayoutChild object after its
// underlying LayoutObject has been destroyed).
bool IsValid() const { return box_; }
void Trace(blink::Visitor*) override;
private:
LayoutBox* box_;
Member<PrepopulatedComputedStylePropertyMap> style_map_;
DISALLOW_COPY_AND_ASSIGN(CustomLayoutChild);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CUSTOM_LAYOUT_CHILD_H_
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