tor-browser

The Tor Browser
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ViewportFrame.h (3824B)

      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 http://mozilla.org/MPL/2.0/. */
      6 
      7 /*
      8 * rendering object that is the root of the frame tree, which contains
      9 * contains fixed-positioned elements
     10 */
     11 
     12 #ifndef mozilla_ViewportFrame_h
     13 #define mozilla_ViewportFrame_h
     14 
     15 #include "nsContainerFrame.h"
     16 
     17 class nsPresContext;
     18 
     19 namespace mozilla {
     20 
     21 class nsDisplayWrapList;
     22 class ServoRestyleState;
     23 
     24 /**
     25 * ViewportFrame is the parent of a single child -- the root canvas frame or a
     26 * scroll container frame containing the root canvas frame. See
     27 * nsCSSFrameConstructor::SetUpDocElementContainingBlock() for the root frame
     28 * hierarchy. ViewportFrame stores this child in its primary child list.
     29 */
     30 class ViewportFrame : public nsContainerFrame {
     31 public:
     32  NS_DECL_QUERYFRAME
     33  NS_DECL_FRAMEARENA_HELPERS(ViewportFrame)
     34 
     35  explicit ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
     36      : ViewportFrame(aStyle, aPresContext, kClassID) {}
     37 
     38  virtual ~ViewportFrame() = default;  // useful for debugging
     39 
     40  void Init(nsIContent* aContent, nsContainerFrame* aParent,
     41            nsIFrame* aPrevInFlow) override;
     42 
     43 #ifdef DEBUG
     44  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
     45  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
     46                    const nsLineList::iterator* aPrevFrameLine,
     47                    nsFrameList&& aFrameList) override;
     48  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
     49 #endif
     50 
     51  void Destroy(DestroyContext&) override;
     52  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
     53                        const nsDisplayListSet& aLists) override;
     54 
     55  nsDisplayWrapList* BuildDisplayListForContentTopLayer(
     56      nsDisplayListBuilder* aBuilder, bool* aIsOpaque = nullptr);
     57 
     58  nsDisplayWrapList* BuildDisplayListForViewTransitionsAndNACTopLayer(
     59      nsDisplayListBuilder* aBuilder);
     60 
     61  nscoord IntrinsicISize(const IntrinsicSizeInput& aInput,
     62                         IntrinsicISizeType aType) override;
     63 
     64  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
     65              const ReflowInput& aReflowInput,
     66              nsReflowStatus& aStatus) override;
     67 
     68  bool ComputeCustomOverflow(mozilla::OverflowAreas&) override { return false; }
     69 
     70  /**
     71   * Get the containing block rect when ViewportFrame serves as a containing
     72   * block. This method accounts for scrollbars, visual viewport, and dynamic
     73   * toolbar sizes.
     74   */
     75  nsRect GetContainingBlockAdjustedForScrollbars(
     76      const ReflowInput& aReflowInput) const;
     77 
     78  /**
     79   * Update our style (and recursively the styles of any anonymous boxes we
     80   * might own)
     81   */
     82  void UpdateStyle(ServoRestyleState& aStyleSet);
     83 
     84  /**
     85   * Return our single anonymous box child.
     86   */
     87  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
     88 
     89  // Returns adjusted viewport size to reflect the positions that position:fixed
     90  // elements are attached.
     91  nsSize AdjustViewportSizeForFixedPosition(const nsRect& aViewportRect) const;
     92 
     93 #ifdef DEBUG_FRAME_DUMP
     94  virtual nsresult GetFrameName(nsAString& aResult) const override;
     95 #endif
     96 
     97 protected:
     98  ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID)
     99      : nsContainerFrame(aStyle, aPresContext, aID) {}
    100 
    101 private:
    102  nsDisplayWrapList* MaybeWrapTopLayerList(nsDisplayListBuilder*,
    103                                           uint16_t aIndex, nsDisplayList&);
    104 
    105  mozilla::FrameChildListID GetAbsoluteListID() const override {
    106    return FrameChildListID::Fixed;
    107  }
    108 };
    109 
    110 }  // namespace mozilla
    111 
    112 #endif  // mozilla_ViewportFrame_h