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-rw-r--r--layout/generic/nsViewportFrame.h108
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diff --git a/layout/generic/nsViewportFrame.h b/layout/generic/nsViewportFrame.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+ * rendering object that is the root of the frame tree, which contains
+ * the document's scrollbars and contains fixed-positioned elements
+ */
+
+#ifndef nsViewportFrame_h___
+#define nsViewportFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+
+class nsPresContext;
+
+/**
+ * ViewportFrame is the parent of a single child - the doc root frame or a scroll frame
+ * containing the doc root frame. ViewportFrame stores this child in its primary child
+ * list.
+ */
+class ViewportFrame : public nsContainerFrame {
+public:
+ NS_DECL_QUERYFRAME_TARGET(ViewportFrame)
+ NS_DECL_QUERYFRAME
+ NS_DECL_FRAMEARENA_HELPERS
+
+ explicit ViewportFrame(nsStyleContext* aContext)
+ : nsContainerFrame(aContext)
+ {}
+ virtual ~ViewportFrame() { } // useful for debugging
+
+ virtual void Init(nsIContent* aContent,
+ nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow) override;
+
+ virtual mozilla::WritingMode GetWritingMode() const override
+ {
+ nsIFrame* firstChild = mFrames.FirstChild();
+ if (firstChild) {
+ return firstChild->GetWritingMode();
+ }
+ return nsIFrame::GetWritingMode();
+ }
+
+#ifdef DEBUG
+ virtual void AppendFrames(ChildListID aListID,
+ nsFrameList& aFrameList) override;
+ virtual void InsertFrames(ChildListID aListID,
+ nsIFrame* aPrevFrame,
+ nsFrameList& aFrameList) override;
+ virtual void RemoveFrame(ChildListID aListID,
+ nsIFrame* aOldFrame) override;
+#endif
+
+ virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+ const nsRect& aDirtyRect,
+ const nsDisplayListSet& aLists) override;
+
+ void BuildDisplayListForTopLayer(nsDisplayListBuilder* aBuilder,
+ nsDisplayList* aList);
+
+ virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
+ virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
+ virtual void Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) override;
+
+ /**
+ * Get the "type" of the frame
+ *
+ * @see nsGkAtoms::viewportFrame
+ */
+ virtual nsIAtom* GetType() const override;
+
+ virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
+
+ /**
+ * Adjust aReflowInput to account for scrollbars and pres shell
+ * GetScrollPositionClampingScrollPortSizeSet and
+ * GetContentDocumentFixedPositionMargins adjustments.
+ * @return the rect to use as containing block rect
+ */
+ nsRect AdjustReflowInputAsContainingBlock(ReflowInput* aReflowInput) const;
+
+#ifdef DEBUG_FRAME_DUMP
+ virtual nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+private:
+ virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const override { return kFixedList; }
+
+protected:
+ /**
+ * Calculate how much room is available for fixed frames. That means
+ * determining if the viewport is scrollable and whether the vertical and/or
+ * horizontal scrollbars are visible. Adjust the computed width/height and
+ * available width for aReflowInput accordingly.
+ * @return the current scroll position, or 0,0 if not scrollable
+ */
+ nsPoint AdjustReflowInputForScrollbars(ReflowInput* aReflowInput) const;
+};
+
+
+#endif // nsViewportFrame_h___