зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
2.3 KiB
C++
66 строки
2.3 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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// 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(nsIPresShell* aPresShell,
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ComputedStyle* aStyle,
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nsFrameState aStateFlags);
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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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nsFrameList& aFrameList) override;
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void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
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private:
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explicit ColumnSetWrapperFrame(ComputedStyle* aStyle);
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~ColumnSetWrapperFrame() override = default;
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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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};
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} // namespace mozilla
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#endif // mozilla_ColumnSetWrapperFrame_h
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