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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_CUSTOM_LAYOUT_FRAGMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_CUSTOM_CUSTOM_LAYOUT_FRAGMENT_H_
#include "third_party/blink/renderer/core/layout/ng/custom/custom_layout_scope.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class NGLayoutInputNode;
class CustomLayoutChild;
class LayoutBox;
struct LogicalSize;
class NGLayoutResult;
class ScriptState;
class ScriptValue;
// This represents the result of a layout (on a LayoutChild).
//
// The result is stuck in time, e.g. performing another layout of the same
// LayoutChild will not live update the values of this fragment.
//
// The web developer can position this child fragment (setting inlineOffset,
// and blockOffset), which are relative to its parent.
//
// This should eventually mirror the information in a NGFragment, it has the
// additional capability that it is exposed to web developers.
class CustomLayoutFragment : public ScriptWrappable {
DEFINE_WRAPPERTYPEINFO();
public:
CustomLayoutFragment(CustomLayoutChild*,
CustomLayoutToken*,
scoped_refptr<const NGLayoutResult>,
const LogicalSize& size,
const base::Optional<LayoutUnit> baseline,
v8::Isolate*);
~CustomLayoutFragment() override = default;
double inlineSize() const { return inline_size_; }
double blockSize() const { return block_size_; }
double inlineOffset() const { return inline_offset_; }
double blockOffset() const { return block_offset_; }
void setInlineOffset(double inline_offset) { inline_offset_ = inline_offset; }
void setBlockOffset(double block_offset) { block_offset_ = block_offset; }
base::Optional<double> baseline() const { return baseline_; }
ScriptValue data(ScriptState*) const;
const NGLayoutResult& GetLayoutResult() const;
const NGLayoutInputNode& GetLayoutNode() const;
bool IsValid() const { return token_->IsValid(); }
void Trace(Visitor*) override;
private:
Member<CustomLayoutChild> child_;
Member<CustomLayoutToken> token_;
// TODO(ikilpatrick): Store the constraint space here so that we can relayout.
//
// There is complexity around state in the layout tree, e.g. from the web
// developers perspective:
//
// const fragment1 = yield child.layoutNextFragment(options1);
// const fragment2 = yield child.layoutNextFragment(options2);
// return { childFragments: [fragment1] };
//
// In the above example the LayoutBox representing "child" has the incorrect
// layout state. As we are processing the returned childFragments we detect
// that the last layout on the child wasn't with the same inputs, and force a
// layout again.
scoped_refptr<const NGLayoutResult> layout_result_;
// The inline and block size on this object should never change.
const double inline_size_;
const double block_size_;
// The offset is relative to our parent, and in the parent's writing mode.
double inline_offset_ = 0;
double block_offset_ = 0;
// The first-line baseline.
const base::Optional<double> baseline_;
TraceWrapperV8Reference<v8::Value> layout_worklet_world_v8_data_;
DISALLOW_COPY_AND_ASSIGN(CustomLayoutFragment);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_CUSTOM_CUSTOM_LAYOUT_FRAGMENT_H_
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