gecko-dev/layout/xul/nsRootBoxFrame.cpp

/* -*- 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/. */

#include "nsHTMLParts.h"
#include "nsStyleConsts.h"
#include "nsGkAtoms.h"
#include "nsBoxFrame.h"
#include "nsDisplayList.h"
#include "nsStackLayout.h"
#include "nsIPopupContainer.h"
#include "nsIContent.h"
#include "nsFrameManager.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/PresShell.h"

using namespace mozilla;

// Interface IDs

//#define DEBUG_REFLOW

// static
nsIPopupContainer* nsIPopupContainer::GetPopupContainer(PresShell* aPresShell) {
  if (!aPresShell) {
    return nullptr;
  }
  nsIFrame* rootFrame = aPresShell->GetRootFrame();
  if (!rootFrame) {
    return nullptr;
  }

  if (rootFrame) {
    rootFrame = rootFrame->PrincipalChildList().FirstChild();
  }

  nsIPopupContainer* rootBox = do_QueryFrame(rootFrame);

  // If the rootBox was not found yet this may be a top level non-XUL document.
  if (rootFrame && !rootBox) {
    // In a non-XUL document the rootFrame here will be a nsHTMLScrollFrame,
    // get the nsCanvasFrame (which is the popup container) from it.
    rootFrame = rootFrame->GetContentInsertionFrame();
    rootBox = do_QueryFrame(rootFrame);
  }

  return rootBox;
}

class nsRootBoxFrame final : public nsBoxFrame, public nsIPopupContainer {
 public:
  friend nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
                                  ComputedStyle* aStyle);

  explicit nsRootBoxFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(nsRootBoxFrame)

  virtual nsPopupSetFrame* GetPopupSetFrame() override;
  virtual void SetPopupSetFrame(nsPopupSetFrame* aPopupSet) override;
  virtual dom::Element* GetDefaultTooltip() override;
  virtual void SetDefaultTooltip(dom::Element* aTooltip) override;

  virtual void AppendFrames(ChildListID aListID,
                            nsFrameList& aFrameList) override;
  virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
                            const nsLineList::iterator* aPrevFrameLine,
                            nsFrameList& aFrameList) override;
  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus& aStatus) override;
  virtual nsresult HandleEvent(nsPresContext* aPresContext,
                               WidgetGUIEvent* aEvent,
                               nsEventStatus* aEventStatus) override;

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

  virtual bool IsFrameOfType(uint32_t aFlags) const override {
    // Override bogus IsFrameOfType in nsBoxFrame.
    if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
      return false;
    return nsBoxFrame::IsFrameOfType(aFlags);
  }

#ifdef DEBUG_FRAME_DUMP
  virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif

  nsPopupSetFrame* mPopupSetFrame;

 protected:
  dom::Element* mDefaultTooltip;
};

//----------------------------------------------------------------------

nsContainerFrame* NS_NewRootBoxFrame(PresShell* aPresShell,
                                     ComputedStyle* aStyle) {
  return new (aPresShell) nsRootBoxFrame(aStyle, aPresShell->GetPresContext());
}

NS_IMPL_FRAMEARENA_HELPERS(nsRootBoxFrame)

nsRootBoxFrame::nsRootBoxFrame(ComputedStyle* aStyle,
                               nsPresContext* aPresContext)
    : nsBoxFrame(aStyle, aPresContext, kClassID, true),
      mPopupSetFrame(nullptr),
      mDefaultTooltip(nullptr) {
  nsCOMPtr<nsBoxLayout> layout;
  NS_NewStackLayout(layout);
  SetXULLayoutManager(layout);
}

void nsRootBoxFrame::AppendFrames(ChildListID aListID,
                                  nsFrameList& aFrameList) {
  MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list ID");
  MOZ_ASSERT(mFrames.IsEmpty(), "already have a child frame");
  nsBoxFrame::AppendFrames(aListID, aFrameList);
}

void nsRootBoxFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
                                  const nsLineList::iterator* aPrevFrameLine,
                                  nsFrameList& aFrameList) {
  // Because we only support a single child frame inserting is the same
  // as appending.
  MOZ_ASSERT(!aPrevFrame, "unexpected previous sibling frame");
  AppendFrames(aListID, aFrameList);
}

void nsRootBoxFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) {
  NS_ASSERTION(aListID == kPrincipalList, "unexpected child list ID");
  if (aOldFrame == mFrames.FirstChild()) {
    nsBoxFrame::RemoveFrame(aListID, aOldFrame);
  } else {
    MOZ_CRASH("unknown aOldFrame");
  }
}

#ifdef DEBUG_REFLOW
int32_t gReflows = 0;
#endif

void nsRootBoxFrame::Reflow(nsPresContext* aPresContext,
                            ReflowOutput& aDesiredSize,
                            const ReflowInput& aReflowInput,
                            nsReflowStatus& aStatus) {
  DO_GLOBAL_REFLOW_COUNT("nsRootBoxFrame");
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

#ifdef DEBUG_REFLOW
  gReflows++;
  printf("----Reflow %d----\n", gReflows);
#endif
  return nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
}

void nsRootBoxFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                      const nsDisplayListSet& aLists) {
  if (mContent && mContent->GetProperty(nsGkAtoms::DisplayPortMargins)) {
    // The XUL document's root element may have displayport margins set in
    // ChromeProcessController::InitializeRoot, and we should to supply the
    // base rect.
    nsRect displayPortBase =
        aBuilder->GetVisibleRect().Intersect(nsRect(nsPoint(0, 0), GetSize()));
    nsLayoutUtils::SetDisplayPortBase(mContent, displayPortBase);
  }

  // root boxes don't need a debug border/outline or a selection overlay...
  // They *may* have a background propagated to them, so force creation
  // of a background display list element.
  DisplayBorderBackgroundOutline(aBuilder, aLists, true);

  BuildDisplayListForChildren(aBuilder, aLists);
}

nsresult nsRootBoxFrame::HandleEvent(nsPresContext* aPresContext,
                                     WidgetGUIEvent* aEvent,
                                     nsEventStatus* aEventStatus) {
  NS_ENSURE_ARG_POINTER(aEventStatus);
  if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
    return NS_OK;
  }

  if (aEvent->mMessage == eMouseUp) {
    nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
  }

  return NS_OK;
}

nsPopupSetFrame* nsRootBoxFrame::GetPopupSetFrame() { return mPopupSetFrame; }

void nsRootBoxFrame::SetPopupSetFrame(nsPopupSetFrame* aPopupSet) {
  // Under normal conditions this should only be called once.  However,
  // if something triggers ReconstructDocElementHierarchy, we will
  // destroy this frame's child (the nsDocElementBoxFrame), but not this
  // frame.  This will cause the popupset to remove itself by calling
  // |SetPopupSetFrame(nullptr)|, and then we'll be able to accept a new
  // popupset.  Since the anonymous content is associated with the
  // nsDocElementBoxFrame, we'll get a new popupset when the new doc
  // element box frame is created.
  MOZ_ASSERT(!aPopupSet || !mPopupSetFrame,
             "Popup set is already defined! Only 1 allowed.");
  mPopupSetFrame = aPopupSet;
}

dom::Element* nsRootBoxFrame::GetDefaultTooltip() { return mDefaultTooltip; }

void nsRootBoxFrame::SetDefaultTooltip(dom::Element* aTooltip) {
  mDefaultTooltip = aTooltip;
}

NS_QUERYFRAME_HEAD(nsRootBoxFrame)
  NS_QUERYFRAME_ENTRY(nsIPopupContainer)
NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)

#ifdef DEBUG_FRAME_DUMP
nsresult nsRootBoxFrame::GetFrameName(nsAString& aResult) const {
  return MakeFrameName(u"RootBox"_ns, aResult);
}
#endif