forked from mirrors/gecko-dev
e0118cf297
The containing block rect which the fixed position elements are relative to should exclude the scrollbar or scrollbar-gutter area. Current, we always use the origin at (0,0), which makes fixed position elements draw behind the gutter area on the left edge of the viewport. This patch adjusts the fixed pos containing block's origin when there is a scrollbar or scrollbar-gutter on the left edge of the viewport. In other words, the containing block's origin becomes the same as `nsCanvasFrame`'s origin. The "-001" test uses `scrollbar-gutter: stable`, and we already pass it without this patch. The "-002" variant tests `scrollbar-gutter: stable both-edges`, which requires this patch to pass. Differential Revision: https://phabricator.services.mozilla.com/D199687
118 lines
4 KiB
C++
118 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* rendering object that is the root of the frame tree, which contains
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* the document's scrollbars and contains fixed-positioned elements
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*/
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#ifndef mozilla_ViewportFrame_h
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#define mozilla_ViewportFrame_h
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#include "mozilla/Attributes.h"
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#include "nsContainerFrame.h"
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class nsPresContext;
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namespace mozilla {
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class nsDisplayWrapList;
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class ServoRestyleState;
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/**
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* ViewportFrame is the parent of a single child - the doc root frame or a
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* scroll frame containing the doc root frame. ViewportFrame stores this child
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* in its primary child list.
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*/
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class ViewportFrame : public nsContainerFrame {
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public:
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(ViewportFrame)
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explicit ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
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: ViewportFrame(aStyle, aPresContext, kClassID) {}
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virtual ~ViewportFrame() = default; // useful for debugging
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void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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#ifdef DEBUG
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void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
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void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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const nsLineList::iterator* aPrevFrameLine,
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nsFrameList&& aFrameList) override;
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void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
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#endif
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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nsDisplayWrapList* BuildDisplayListForTopLayer(nsDisplayListBuilder* aBuilder,
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bool* aIsOpaque = nullptr);
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nscoord GetMinISize(gfxContext* aRenderingContext) override;
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nscoord GetPrefISize(gfxContext* aRenderingContext) override;
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void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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bool ComputeCustomOverflow(mozilla::OverflowAreas&) override { return false; }
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/**
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* Adjust aReflowInput to account for scrollbars and pres shell
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* GetVisualViewportSizeSet and
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* GetContentDocumentFixedPositionMargins adjustments.
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* @return the rect to use as containing block rect
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*/
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nsRect AdjustReflowInputAsContainingBlock(ReflowInput* aReflowInput) const;
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/**
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* Update our style (and recursively the styles of any anonymous boxes we
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* might own)
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*/
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void UpdateStyle(ServoRestyleState& aStyleSet);
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/**
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* Return our single anonymous box child.
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*/
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void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
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// Returns adjusted viewport size to reflect the positions that position:fixed
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// elements are attached.
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nsSize AdjustViewportSizeForFixedPosition(const nsRect& aViewportRect) const;
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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protected:
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ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID)
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: nsContainerFrame(aStyle, aPresContext, aID), mView(nullptr) {}
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/**
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* Calculate how much room is available for fixed frames. That means
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* determining if the viewport is scrollable and whether the vertical and/or
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* horizontal scrollbars are visible. Adjust the computed isize/bsize and
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* available isize for aReflowInput accordingly.
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* @return the current scroll position, or (0,0) if not scrollable.
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*/
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nsPoint AdjustReflowInputForScrollbars(ReflowInput* aReflowInput) const;
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nsView* GetViewInternal() const override { return mView; }
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void SetViewInternal(nsView* aView) override { mView = aView; }
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private:
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mozilla::FrameChildListID GetAbsoluteListID() const override {
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return FrameChildListID::Fixed;
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}
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nsView* mView;
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};
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} // namespace mozilla
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#endif // mozilla_ViewportFrame_h
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