1 files changed, 114 insertions, 0 deletions
diff --git a/layout/forms/nsFieldSetFrame.h b/layout/forms/nsFieldSetFrame.h
new file mode 100644
index 0000000000..741b3bef52
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+++ b/layout/forms/nsFieldSetFrame.h
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsFieldSetFrame_h___
+#define nsFieldSetFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "ImgDrawResult.h"
+#include "nsContainerFrame.h"
+#include "nsIScrollableFrame.h"
+
+class nsFieldSetFrame final : public nsContainerFrame {
+  typedef mozilla::image::ImgDrawResult ImgDrawResult;
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsFieldSetFrame)
+  NS_DECL_QUERYFRAME
+
+  explicit nsFieldSetFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
+
+  nscoord GetIntrinsicISize(gfxContext* aRenderingContext,
+                            mozilla::IntrinsicISizeType);
+  nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+  /**
+   * The area to paint box-shadows around.  It's the border rect except
+   * when there's a <legend> we offset the y-position to the center of it.
+   */
+  nsRect VisualBorderRectRelativeToSelf() const override;
+
+  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+              const ReflowInput& aReflowInput,
+              nsReflowStatus& aStatus) override;
+
+  nscoord SynthesizeFallbackBaseline(
+      mozilla::WritingMode aWM,
+      BaselineSharingGroup aBaselineGroup) const override;
+  BaselineSharingGroup GetDefaultBaselineSharingGroup() const override;
+  Maybe<nscoord> GetNaturalBaselineBOffset(
+      mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup,
+      BaselineExportContext aExportContext) const override;
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+  ImgDrawResult PaintBorder(nsDisplayListBuilder* aBuilder,
+                            gfxContext& aRenderingContext, nsPoint aPt,
+                            const nsRect& aDirtyRect);
+
+  void SetInitialChildList(ChildListID aListID,
+                           nsFrameList&& aChildList) override;
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override;
+#ifdef DEBUG
+  void RemoveFrame(DestroyContext&, ChildListID aListID,
+                   nsIFrame* aOldFrame) override;
+#endif
+
+  nsIScrollableFrame* GetScrollTargetFrame() const override;
+
+  // Return the block wrapper around our kids.
+  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
+
+#ifdef ACCESSIBILITY
+  virtual mozilla::a11y::AccType AccessibleType() override;
+#endif
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"FieldSet"_ns, aResult);
+  }
+#endif
+
+  /**
+   * Return the anonymous frame that contains all descendants except the legend
+   * frame.  This can be a block/grid/flex/scroll frame.  It always has
+   * the pseudo type nsCSSAnonBoxes::fieldsetContent.  If it's a scroll frame,
+   * the scrolled frame can be a block/grid/flex frame.
+   * This may return null, for example for a fieldset that is a true overflow
+   * container.
+   */
+  nsContainerFrame* GetInner() const;
+
+  /**
+   * Return the frame that represents the rendered legend if any.
+   * https://html.spec.whatwg.org/multipage/rendering.html#rendered-legend
+   */
+  nsIFrame* GetLegend() const;
+
+  /** @see mLegendSpace below */
+  nscoord LegendSpace() const { return mLegendSpace; }
+
+ protected:
+  /**
+   * Convenience method to create a continuation for aChild after we've
+   * reflowed it and got the reflow status aStatus.
+   */
+  void EnsureChildContinuation(nsIFrame* aChild, const nsReflowStatus& aStatus);
+
+  mozilla::LogicalRect mLegendRect;
+
+  // This is how much to subtract from our inner frame's content-box block-size
+  // to account for a protruding legend.  It's zero if there's no legend or
+  // the legend fits entirely inside our start border.
+  nscoord mLegendSpace;
+};
+
+#endif  // nsFieldSetFrame_h___