gecko-dev/layout/generic/nsSubDocumentFrame.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef NSSUBDOCUMENTFRAME_H_
#define NSSUBDOCUMENTFRAME_H_

#include "mozilla/Attributes.h"
#include "nsAtomicContainerFrame.h"
#include "nsIReflowCallback.h"
#include "nsFrameLoader.h"
#include "Units.h"

/******************************************************************************
 * nsSubDocumentFrame
 *****************************************************************************/
class nsSubDocumentFrame final
  : public nsAtomicContainerFrame
  , public nsIReflowCallback
{
public:
  NS_DECL_FRAMEARENA_HELPERS(nsSubDocumentFrame)

  explicit nsSubDocumentFrame(ComputedStyle* aStyle);

#ifdef DEBUG_FRAME_DUMP
  void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override;
  nsresult GetFrameName(nsAString& aResult) const override;
#endif

  NS_DECL_QUERYFRAME

  bool IsFrameOfType(uint32_t aFlags) const override
  {
    return nsAtomicContainerFrame::IsFrameOfType(aFlags &
      ~(nsIFrame::eReplaced |
        nsIFrame::eReplacedSizing |
        nsIFrame::eReplacedContainsBlock));
  }

  void Init(nsIContent*       aContent,
            nsContainerFrame* aParent,
            nsIFrame*         aPrevInFlow) override;

  void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override;

  nscoord GetMinISize(gfxContext *aRenderingContext) override;
  nscoord GetPrefISize(gfxContext *aRenderingContext) override;

  mozilla::IntrinsicSize GetIntrinsicSize() override;
  nsSize  GetIntrinsicRatio() override;

  mozilla::LogicalSize
  ComputeAutoSize(gfxContext*                 aRenderingContext,
                  mozilla::WritingMode        aWritingMode,
                  const mozilla::LogicalSize& aCBSize,
                  nscoord                     aAvailableISize,
                  const mozilla::LogicalSize& aMargin,
                  const mozilla::LogicalSize& aBorder,
                  const mozilla::LogicalSize& aPadding,
                  ComputeSizeFlags            aFlags) override;

  mozilla::LogicalSize
  ComputeSize(gfxContext*                 aRenderingContext,
              mozilla::WritingMode        aWritingMode,
              const mozilla::LogicalSize& aCBSize,
              nscoord                     aAvailableISize,
              const mozilla::LogicalSize& aMargin,
              const mozilla::LogicalSize& aBorder,
              const mozilla::LogicalSize& aPadding,
              ComputeSizeFlags            aFlags) override;

  void Reflow(nsPresContext*     aPresContext,
              ReflowOutput&      aDesiredSize,
              const ReflowInput& aReflowInput,
              nsReflowStatus&    aStatus) override;

  void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                        const nsDisplayListSet& aLists) override;

  nsresult AttributeChanged(int32_t aNameSpaceID,
                            nsAtom* aAttribute,
                            int32_t aModType) override;

  // if the content is "visibility:hidden", then just hide the view
  // and all our contents. We don't extend "visibility:hidden" to
  // the child content ourselves, since it belongs to a different
  // document and CSS doesn't inherit in there.
  bool SupportsVisibilityHidden() override { return false; }

#ifdef ACCESSIBILITY
  mozilla::a11y::AccType AccessibleType() override;
#endif

  nsIDocShell* GetDocShell();
  nsresult BeginSwapDocShells(nsIFrame* aOther);
  void EndSwapDocShells(nsIFrame* aOther);
  nsView* EnsureInnerView();
  nsIFrame* GetSubdocumentRootFrame();
  enum {
    IGNORE_PAINT_SUPPRESSION = 0x1
  };
  nsIPresShell* GetSubdocumentPresShellForPainting(uint32_t aFlags);
  mozilla::ScreenIntSize GetSubdocumentSize();

  // nsIReflowCallback
  bool ReflowFinished() override;
  void ReflowCallbackCanceled() override;

  bool ShouldClipSubdocument()
  {
    nsFrameLoader* frameLoader = FrameLoader();
    return !frameLoader || frameLoader->ShouldClipSubdocument();
  }

  bool ShouldClampScrollPosition()
  {
    nsFrameLoader* frameLoader = FrameLoader();
    return !frameLoader || frameLoader->ShouldClampScrollPosition();
  }

  /**
   * Return true if pointer event hit-testing should be allowed to target
   * content in the subdocument.
   */
  bool PassPointerEventsToChildren();

  void MaybeShowViewer()
  {
    if (!mDidCreateDoc && !mCallingShow) {
      ShowViewer();
    }
  }

protected:
  friend class AsyncFrameInit;

  // Helper method to look up the HTML marginwidth & marginheight attributes.
  mozilla::CSSIntSize GetMarginAttributes();

  nsFrameLoader* FrameLoader();

  bool IsInline() { return mIsInline; }

  nscoord GetIntrinsicISize();
  nscoord GetIntrinsicBSize();

  // Show our document viewer. The document viewer is hidden via a script
  // runner, so that we can save and restore the presentation if we're
  // being reframed.
  void ShowViewer();

  /* Obtains the frame we should use for intrinsic size information if we are
   * an HTML <object> or <embed>  (a replaced element - not <iframe>)
   * and our sub-document has an intrinsic size. The frame returned is the
   * frame for the document element of the document we're embedding.
   *
   * Called "Obtain*" and not "Get*" because of comment on GetDocShell that
   * says it should be called ObtainDocShell because of its side effects.
   */
  nsIFrame* ObtainIntrinsicSizeFrame();

  nsView* GetViewInternal() const override { return mOuterView; }
  void SetViewInternal(nsView* aView) override { mOuterView = aView; }

  RefPtr<nsFrameLoader> mFrameLoader;
  nsView* mOuterView;
  nsView* mInnerView;
  bool mIsInline;
  bool mPostedReflowCallback;
  bool mDidCreateDoc;
  bool mCallingShow;
  WeakFrame mPreviousCaret;
};

#endif /* NSSUBDOCUMENTFRAME_H_ */