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26a6db6fb1
This patch changes the signature to `GetMinISize()`, `GetPrefISize()`, `IntrinsicISize` by adding a helper struct as a preparation. Then we can just add more data such as a percentage basis to the struct without altering the signature in the future. When passing `IntrinsicSizeInput` struct down to another helper method, we generally just pass the original one if the method is computing the intrinsic size of our own or our anonymous children. If the method is computing our children's intrinsic contribution, we'll need to create a brand new `IntrinsicSizeInput` for our children. Differential Revision: https://phabricator.services.mozilla.com/D219521
91 lines
3.2 KiB
C++
91 lines
3.2 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 https://mozilla.org/MPL/2.0/. */
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// A frame for CSS multi-column layout that wraps nsColumnSetFrames and
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// column-span frames.
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#ifndef mozilla_ColumnSetWrapperFrame_h
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#define mozilla_ColumnSetWrapperFrame_h
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#include "nsBlockFrame.h"
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namespace mozilla {
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class PresShell;
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// This class is a wrapper for nsColumnSetFrames and column-span frame.
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// Essentially, we divide the *original* nsColumnSetFrame into multiple
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// nsColumnSetFrames on the basis of the number and position of spanning
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// elements.
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//
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// This wrapper is necessary for implementing column-span as it allows us to
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// maintain each nsColumnSetFrame as an independent set of columns, and each
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// column-span element then becomes just a block level element.
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//
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class ColumnSetWrapperFrame final : public nsBlockFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS(ColumnSetWrapperFrame)
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NS_DECL_QUERYFRAME
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friend nsBlockFrame* ::NS_NewColumnSetWrapperFrame(
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mozilla::PresShell* aPresShell, ComputedStyle* aStyle,
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nsFrameState aStateFlags);
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void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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nsContainerFrame* GetContentInsertionFrame() override;
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void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
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#ifdef DEBUG_FRAME_DUMP
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nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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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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void MarkIntrinsicISizesDirty() override;
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nscoord IntrinsicISize(const IntrinsicSizeInput& aInput,
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IntrinsicISizeType aType) override;
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Maybe<nscoord> GetNaturalBaselineBOffset(
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WritingMode aWM, BaselineSharingGroup aBaselineGroup,
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BaselineExportContext aExportContext) const override;
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private:
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explicit ColumnSetWrapperFrame(ComputedStyle* aStyle,
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nsPresContext* aPresContext);
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~ColumnSetWrapperFrame() override = default;
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// MinISize() and PrefISize() are helpers to implement IntrinsicISize().
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nscoord MinISize(const IntrinsicSizeInput& aInput);
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nscoord PrefISize(const IntrinsicSizeInput& aInput);
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#ifdef DEBUG
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static void AssertColumnSpanWrapperSubtreeIsSane(const nsIFrame* aFrame);
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// True if frame constructor has finished building this frame and all of
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// its descendants.
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bool mFinishedBuildingColumns = false;
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#endif
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template <typename Iterator>
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Maybe<nscoord> GetBaselineBOffset(Iterator aStart, Iterator aEnd,
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WritingMode aWM,
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BaselineSharingGroup aBaselineGroup,
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BaselineExportContext aExportContext) const;
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};
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} // namespace mozilla
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#endif // mozilla_ColumnSetWrapperFrame_h
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