Sylvestre Ledru
55481ac4b5
replaced by .editorconfig Differential Revision: https://phabricator.services.mozilla.com/D287852
112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/* 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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* compute sticky positioning, both during reflow and when the scrolling
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* container scrolls
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*/
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#ifndef StickyScrollContainer_h
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#define StickyScrollContainer_h
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#include "mozilla/DepthOrderedFrameList.h"
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#include "nsPoint.h"
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#include "nsRectAbsolute.h"
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#include "nsTArray.h"
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struct nsRect;
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class nsIFrame;
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namespace mozilla {
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class ScrollContainerFrame;
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class StickyScrollContainer final {
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public:
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/**
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* Find (and create if necessary) the StickyScrollContainer associated with
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* the scroll container of the given frame, if a scroll container exists.
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*/
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static StickyScrollContainer* GetOrCreateForFrame(nsIFrame*);
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void AddFrame(nsIFrame* aFrame) { mFrames.Add(aFrame); }
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void RemoveFrame(nsIFrame* aFrame) { mFrames.Remove(aFrame); }
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ScrollContainerFrame* ScrollContainer() const {
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return mScrollContainerFrame;
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}
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// Compute the offsets for a sticky position element
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static void ComputeStickyOffsets(nsIFrame* aFrame);
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/**
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* Compute the position of a sticky positioned frame, based on information
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* stored in its properties along with our scroll frame and scroll position.
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*/
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nsPoint ComputePosition(nsIFrame* aFrame) const;
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/**
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* Compute where a frame should not scroll with the page, represented by the
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* difference of two rectangles.
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*/
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void GetScrollRanges(nsIFrame* aFrame, nsRectAbsolute* aOuter,
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nsRectAbsolute* aInner) const;
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/**
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* Compute and set the position of a frame and its following continuations.
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*/
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void PositionContinuations(nsIFrame* aFrame);
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/**
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* Compute and set the position of all sticky frames, given the current
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* scroll position of the scroll frame. If not in reflow, aSubtreeRoot should
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* be null; otherwise, overflow-area updates will be limited to not affect
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* aSubtreeRoot or its ancestors.
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*/
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void UpdatePositions(nsPoint aScrollPosition, nsIFrame* aSubtreeRoot);
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void ScrollPositionDidChange(const nsPoint&);
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~StickyScrollContainer();
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const DepthOrderedFrameList& GetFrames() const { return mFrames; }
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/**
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* Returns true if the frame is "stuck" in the y direction, ie it's acting
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* like fixed position. aFrame should be in GetFrames().
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*/
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bool IsStuckInYDirection(nsIFrame* aFrame) const;
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/**
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* Calls FrameNeedsReflow on all sticky position children.
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*/
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void MarkFramesForReflow();
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void SetShouldFlatten(bool aShouldFlatten) {
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mShouldFlatten = aShouldFlatten;
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}
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bool ShouldFlattenAway() const { return mShouldFlatten; }
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explicit StickyScrollContainer(ScrollContainerFrame* aScrollContainerFrame);
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private:
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/**
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* Compute two rectangles that determine sticky positioning: |aStick|, based
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* on the scroll container, and |aContain|, based on the containing block.
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* Sticky positioning keeps the frame position (its upper-left corner) always
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* within |aContain| and secondarily within |aStick|.
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*/
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void ComputeStickyLimits(nsIFrame* aFrame, nsRect* aStick,
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nsRect* aContain) const;
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ScrollContainerFrame* const mScrollContainerFrame;
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DepthOrderedFrameList mFrames;
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nsPoint mScrollPosition;
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bool mShouldFlatten = false;
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};
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} // namespace mozilla
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#endif /* StickyScrollContainer_h */
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