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ColumnSetWrapperFrame.h (3292B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
      6 
      7 // A frame for CSS multi-column layout that wraps nsColumnSetFrames and
      8 // column-span frames.
      9 
     10 #ifndef mozilla_ColumnSetWrapperFrame_h
     11 #define mozilla_ColumnSetWrapperFrame_h
     12 
     13 #include "nsBlockFrame.h"
     14 
     15 namespace mozilla {
     16 
     17 class PresShell;
     18 
     19 // This class is a wrapper for nsColumnSetFrames and column-span frame.
     20 // Essentially, we divide the *original* nsColumnSetFrame into multiple
     21 // nsColumnSetFrames on the basis of the number and position of spanning
     22 // elements.
     23 //
     24 // This wrapper is necessary for implementing column-span as it allows us to
     25 // maintain each nsColumnSetFrame as an independent set of columns, and each
     26 // column-span element then becomes just a block level element.
     27 //
     28 class ColumnSetWrapperFrame final : public nsBlockFrame {
     29 public:
     30  NS_DECL_FRAMEARENA_HELPERS(ColumnSetWrapperFrame)
     31  NS_DECL_QUERYFRAME
     32 
     33  friend nsBlockFrame* ::NS_NewColumnSetWrapperFrame(
     34      mozilla::PresShell* aPresShell, ComputedStyle* aStyle,
     35      nsFrameState aStateFlags);
     36 
     37  void Init(nsIContent* aContent, nsContainerFrame* aParent,
     38            nsIFrame* aPrevInFlow) override;
     39 
     40  nsContainerFrame* GetContentInsertionFrame() override;
     41 
     42  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
     43 
     44 #ifdef DEBUG_FRAME_DUMP
     45  nsresult GetFrameName(nsAString& aResult) const override;
     46 #endif
     47 
     48  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
     49 
     50  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
     51                    const nsLineList::iterator* aPrevFrameLine,
     52                    nsFrameList&& aFrameList) override;
     53 
     54  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
     55 
     56  void MarkIntrinsicISizesDirty() override;
     57 
     58  nscoord IntrinsicISize(const IntrinsicSizeInput& aInput,
     59                         IntrinsicISizeType aType) override;
     60 
     61  Maybe<nscoord> GetNaturalBaselineBOffset(
     62      WritingMode aWM, BaselineSharingGroup aBaselineGroup,
     63      BaselineExportContext aExportContext) const override;
     64 
     65 private:
     66  explicit ColumnSetWrapperFrame(ComputedStyle* aStyle,
     67                                 nsPresContext* aPresContext);
     68  ~ColumnSetWrapperFrame() override = default;
     69 
     70  // MinISize() and PrefISize() are helpers to implement IntrinsicISize().
     71  nscoord MinISize(const IntrinsicSizeInput& aInput);
     72  nscoord PrefISize(const IntrinsicSizeInput& aInput);
     73 
     74 #ifdef DEBUG
     75  static void AssertColumnSpanWrapperSubtreeIsSane(const nsIFrame* aFrame);
     76 
     77  // True if frame constructor has finished building this frame and all of
     78  // its descendants.
     79  bool mFinishedBuildingColumns = false;
     80 #endif
     81 
     82  template <typename Iterator>
     83  Maybe<nscoord> GetBaselineBOffset(Iterator aStart, Iterator aEnd,
     84                                    WritingMode aWM,
     85                                    BaselineSharingGroup aBaselineGroup,
     86                                    BaselineExportContext aExportContext) const;
     87 };
     88 
     89 }  // namespace mozilla
     90 
     91 #endif  // mozilla_ColumnSetWrapperFrame_h