Add grid/flex layout support for <fieldset>

third_party/WebKit/Source/core/layout/LayoutFieldset.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef LayoutFieldset_h
 #define LayoutFieldset_h
 
-#include "core/layout/LayoutBlockFlow.h"
+#include "core/layout/LayoutFlexibleBox.h"
 
 namespace blink {
 
-class LayoutFieldset final : public LayoutBlockFlow {
+class LayoutFieldset final : public LayoutFlexibleBox {
 public:
     explicit LayoutFieldset(Element*);
 
     LayoutBox* findInFlowLegend() const;
 
     const char* name() const override { return "LayoutFieldset"; }
 
 private:
-    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectFieldset || LayoutBlockFlow::isOfType(type); }
-
-    LayoutObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) override;
-
-    void computePreferredLogicalWidths() override;
+    void addChild(LayoutObject* newChild, LayoutObject* beforeChild = nullptr) override;
     bool avoidsFloats() const override { return true; }
 
+    // We override the two baseline functions because we want our baseline to be the bottom of our margin box.
+    int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode) const override;
+    int inlineBlockBaseline(LineDirectionMode) const override { return -1; }
+
+    void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
+    bool createsAnonymousWrapper() const override { return true; }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectFieldset || LayoutFlexibleBox::isOfType(type); }
+    LayoutObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) override;
     void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&) const override;
     void paintMask(const PaintInfo&, const LayoutPoint&) const override;
+    void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
+    void updateAnonymousChildStyle(const LayoutObject& child, ComputedStyle& childStyle) const override;
+
+    void createInnerBlock();
+    void setLogicalLeftForChild(LayoutBox& child, LayoutUnit logicalLeft);
+    void setLogicalTopForChild(LayoutBox& child, LayoutUnit logicalTop);
+    void removeChild(LayoutObject*) override;
+
+    LayoutBlock* m_innerBlock;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFieldset, isFieldset());
 
 } // namespace blink
 
 #endif // LayoutFieldset_h