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gecko-dev/layout/generic/nsContainerFrame.cpp

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/* -*- 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/. */
/* base class #1 for rendering objects that have child lists */
#include "nsContainerFrame.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/HTMLSummaryElement.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsFlexContainerFrame.h"
#include "mozilla/dom/Document.h"
#include "nsPresContext.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsStyleConsts.h"
#include "nsView.h"
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"
#include "nsViewManager.h"
#include "nsIWidget.h"
#include "nsCSSRendering.h"
#include "nsError.h"
#include "nsDisplayList.h"
#include "nsIBaseWindow.h"
#include "nsBoxLayoutState.h"
#include "nsCSSFrameConstructor.h"
#include "nsBlockFrame.h"
#include "nsBulletFrame.h"
#include "nsPlaceholderFrame.h"
#include "mozilla/AutoRestore.h"
#include "nsIFrameInlines.h"
#include "nsPrintfCString.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::layout;
nsContainerFrame::~nsContainerFrame() {}
NS_QUERYFRAME_HEAD(nsContainerFrame)
NS_QUERYFRAME_ENTRY(nsContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSplittableFrame)
void nsContainerFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
nsSplittableFrame::Init(aContent, aParent, aPrevInFlow);
if (aPrevInFlow) {
// Make sure we copy bits from our prev-in-flow that will affect
// us. A continuation for a container frame needs to know if it
// has a child with a view so that we'll properly reposition it.
if (aPrevInFlow->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)
AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
}
void nsContainerFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) {
#ifdef DEBUG
nsFrame::VerifyDirtyBitSet(aChildList);
for (nsIFrame* f : aChildList) {
MOZ_ASSERT(f->GetParent() == this, "Unexpected parent");
}
#endif
if (aListID == kPrincipalList) {
MOZ_ASSERT(mFrames.IsEmpty(),
"unexpected second call to SetInitialChildList");
mFrames.SetFrames(aChildList);
} else if (aListID == kBackdropList) {
MOZ_ASSERT(StyleDisplay()->mTopLayer != NS_STYLE_TOP_LAYER_NONE,
"Only top layer frames should have backdrop");
MOZ_ASSERT(GetStateBits() & NS_FRAME_OUT_OF_FLOW,
"Top layer frames should be out-of-flow");
MOZ_ASSERT(!GetProperty(BackdropProperty()),
"We shouldn't have setup backdrop frame list before");
#ifdef DEBUG
{
nsIFrame* placeholder = aChildList.FirstChild();
MOZ_ASSERT(aChildList.OnlyChild(), "Should have only one backdrop");
MOZ_ASSERT(placeholder->IsPlaceholderFrame(),
"The frame to be stored should be a placeholder");
MOZ_ASSERT(static_cast<nsPlaceholderFrame*>(placeholder)
->GetOutOfFlowFrame()
->IsBackdropFrame(),
"The placeholder should points to a backdrop frame");
}
#endif
nsFrameList* list = new (PresShell()) nsFrameList(aChildList);
SetProperty(BackdropProperty(), list);
} else {
MOZ_ASSERT_UNREACHABLE("Unexpected child list");
}
}
void nsContainerFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) {
MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
"unexpected child list");
if (MOZ_UNLIKELY(aFrameList.IsEmpty())) {
return;
}
DrainSelfOverflowList(); // ensure the last frame is in mFrames
mFrames.AppendFrames(this, aFrameList);
if (aListID != kNoReflowPrincipalList) {
PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
void nsContainerFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
nsFrameList& aFrameList) {
MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
"unexpected child list");
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
if (MOZ_UNLIKELY(aFrameList.IsEmpty())) {
return;
}
DrainSelfOverflowList(); // ensure aPrevFrame is in mFrames
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
if (aListID != kNoReflowPrincipalList) {
PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
void nsContainerFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) {
MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
"unexpected child list");
AutoTArray<nsIFrame*, 10> continuations;
{
nsIFrame* continuation = aOldFrame;
while (continuation) {
continuations.AppendElement(continuation);
continuation = continuation->GetNextContinuation();
}
}
nsIPresShell* shell = PresShell();
nsContainerFrame* lastParent = nullptr;
// Loop and destroy aOldFrame and all of its continuations.
//
// Request a reflow on the parent frames involved unless we were explicitly
// told not to (kNoReflowPrincipalList).
const bool generateReflowCommand = (kNoReflowPrincipalList != aListID);
for (nsIFrame* continuation : Reversed(continuations)) {
nsContainerFrame* parent = continuation->GetParent();
// Please note that 'parent' may not actually be where 'continuation' lives.
// We really MUST use StealFrame() and nothing else here.
// @see nsInlineFrame::StealFrame for details.
parent->StealFrame(continuation);
continuation->Destroy();
if (generateReflowCommand && parent != lastParent) {
shell->FrameNeedsReflow(parent, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
lastParent = parent;
}
}
}
void nsContainerFrame::DestroyAbsoluteFrames(
nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) {
if (IsAbsoluteContainer()) {
GetAbsoluteContainingBlock()->DestroyFrames(this, aDestructRoot,
aPostDestroyData);
MarkAsNotAbsoluteContainingBlock();
}
}
void nsContainerFrame::SafelyDestroyFrameListProp(
nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData,
nsIPresShell* aPresShell, FrameListPropertyDescriptor aProp) {
// Note that the last frame can be removed through another route and thus
// delete the property -- that's why we fetch the property again before
// removing each frame rather than fetching it once and iterating the list.
while (nsFrameList* frameList = GetProperty(aProp)) {
nsIFrame* frame = frameList->RemoveFirstChild();
if (MOZ_LIKELY(frame)) {
frame->DestroyFrom(aDestructRoot, aPostDestroyData);
} else {
RemoveProperty(aProp);
frameList->Delete(aPresShell);
return;
}
}
}
void nsContainerFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
// Prevent event dispatch during destruction.
if (HasView()) {
GetView()->SetFrame(nullptr);
}
DestroyAbsoluteFrames(aDestructRoot, aPostDestroyData);
// Destroy frames on the principal child list.
mFrames.DestroyFramesFrom(aDestructRoot, aPostDestroyData);
// If we have any IB split siblings, clear their references to us.
if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
// Delete previous sibling's reference to me.
nsIFrame* prevSib = GetProperty(nsIFrame::IBSplitPrevSibling());
if (prevSib) {
NS_WARNING_ASSERTION(
this == prevSib->GetProperty(nsIFrame::IBSplitSibling()),
"IB sibling chain is inconsistent");
prevSib->DeleteProperty(nsIFrame::IBSplitSibling());
}
// Delete next sibling's reference to me.
nsIFrame* nextSib = GetProperty(nsIFrame::IBSplitSibling());
if (nextSib) {
NS_WARNING_ASSERTION(
this == nextSib->GetProperty(nsIFrame::IBSplitPrevSibling()),
"IB sibling chain is inconsistent");
nextSib->DeleteProperty(nsIFrame::IBSplitPrevSibling());
}
#ifdef DEBUG
// This is just so we can assert it's not set in nsFrame::DestroyFrom.
RemoveStateBits(NS_FRAME_PART_OF_IBSPLIT);
#endif
}
if (MOZ_UNLIKELY(!mProperties.IsEmpty())) {
using T = mozilla::FrameProperties::UntypedDescriptor;
bool hasO = false, hasOC = false, hasEOC = false, hasBackdrop = false;
mProperties.ForEach([&](const T& aProp, void*) {
if (aProp == OverflowProperty()) {
hasO = true;
} else if (aProp == OverflowContainersProperty()) {
hasOC = true;
} else if (aProp == ExcessOverflowContainersProperty()) {
hasEOC = true;
} else if (aProp == BackdropProperty()) {
hasBackdrop = true;
}
return true;
});
// Destroy frames on the auxiliary frame lists and delete the lists.
nsPresContext* pc = PresContext();
mozilla::PresShell* presShell = pc->PresShell();
if (hasO) {
SafelyDestroyFrameListProp(aDestructRoot, aPostDestroyData, presShell,
OverflowProperty());
}
MOZ_ASSERT(
IsFrameOfType(eCanContainOverflowContainers) || !(hasOC || hasEOC),
"this type of frame shouldn't have overflow containers");
if (hasOC) {
SafelyDestroyFrameListProp(aDestructRoot, aPostDestroyData, presShell,
OverflowContainersProperty());
}
if (hasEOC) {
SafelyDestroyFrameListProp(aDestructRoot, aPostDestroyData, presShell,
ExcessOverflowContainersProperty());
}
MOZ_ASSERT(!GetProperty(BackdropProperty()) ||
StyleDisplay()->mTopLayer != NS_STYLE_TOP_LAYER_NONE,
"only top layer frame may have backdrop");
if (hasBackdrop) {
SafelyDestroyFrameListProp(aDestructRoot, aPostDestroyData, presShell,
BackdropProperty());
}
}
nsSplittableFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
const nsFrameList& nsContainerFrame::GetChildList(ChildListID aListID) const {
// We only know about the principal child list, the overflow lists,
// and the backdrop list.
switch (aListID) {
case kPrincipalList:
return mFrames;
case kOverflowList: {
nsFrameList* list = GetOverflowFrames();
return list ? *list : nsFrameList::EmptyList();
}
case kOverflowContainersList: {
nsFrameList* list = GetPropTableFrames(OverflowContainersProperty());
return list ? *list : nsFrameList::EmptyList();
}
case kExcessOverflowContainersList: {
nsFrameList* list =
GetPropTableFrames(ExcessOverflowContainersProperty());
return list ? *list : nsFrameList::EmptyList();
}
case kBackdropList: {
nsFrameList* list = GetPropTableFrames(BackdropProperty());
return list ? *list : nsFrameList::EmptyList();
}
default:
return nsSplittableFrame::GetChildList(aListID);
}
}
void nsContainerFrame::GetChildLists(nsTArray<ChildList>* aLists) const {
mFrames.AppendIfNonempty(aLists, kPrincipalList);
using T = mozilla::FrameProperties::UntypedDescriptor;
mProperties.ForEach([this, aLists](const T& aProp, void* aValue) {
typedef const nsFrameList* L;
if (aProp == OverflowProperty()) {
L(aValue)->AppendIfNonempty(aLists, kOverflowList);
} else if (aProp == OverflowContainersProperty()) {
MOZ_ASSERT(IsFrameOfType(nsIFrame::eCanContainOverflowContainers),
"found unexpected OverflowContainersProperty");
Unused << this; // silence clang -Wunused-lambda-capture in opt builds
L(aValue)->AppendIfNonempty(aLists, kOverflowContainersList);
} else if (aProp == ExcessOverflowContainersProperty()) {
MOZ_ASSERT(IsFrameOfType(nsIFrame::eCanContainOverflowContainers),
"found unexpected ExcessOverflowContainersProperty");
Unused << this; // silence clang -Wunused-lambda-capture in opt builds
L(aValue)->AppendIfNonempty(aLists, kExcessOverflowContainersList);
} else if (aProp == BackdropProperty()) {
L(aValue)->AppendIfNonempty(aLists, kBackdropList);
}
return true;
});
nsSplittableFrame::GetChildLists(aLists);
}
/////////////////////////////////////////////////////////////////////////////
// Painting/Events
void nsContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
DisplayBorderBackgroundOutline(aBuilder, aLists);
BuildDisplayListForNonBlockChildren(aBuilder, aLists);
}
void nsContainerFrame::BuildDisplayListForNonBlockChildren(
nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists,
uint32_t aFlags) {
nsIFrame* kid = mFrames.FirstChild();
// Put each child's background directly onto the content list
nsDisplayListSet set(aLists, aLists.Content());
// The children should be in content order
while (kid) {
BuildDisplayListForChild(aBuilder, kid, set, aFlags);
kid = kid->GetNextSibling();
}
}
/* virtual */
void nsContainerFrame::ChildIsDirty(nsIFrame* aChild) {
NS_ASSERTION(NS_SUBTREE_DIRTY(aChild), "child isn't actually dirty");
AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
}
nsIFrame::FrameSearchResult nsContainerFrame::PeekOffsetNoAmount(
bool aForward, int32_t* aOffset) {
NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
// Don't allow the caret to stay in an empty (leaf) container frame.
return CONTINUE_EMPTY;
}
nsIFrame::FrameSearchResult nsContainerFrame::PeekOffsetCharacter(
bool aForward, int32_t* aOffset, PeekOffsetCharacterOptions aOptions) {
NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
// Don't allow the caret to stay in an empty (leaf) container frame.
return CONTINUE_EMPTY;
}
/////////////////////////////////////////////////////////////////////////////
// Helper member functions
/**
* Position the view associated with |aKidFrame|, if there is one. A
* container frame should call this method after positioning a frame,
* but before |Reflow|.
*/
void nsContainerFrame::PositionFrameView(nsIFrame* aKidFrame) {
nsIFrame* parentFrame = aKidFrame->GetParent();
if (!aKidFrame->HasView() || !parentFrame) return;
nsView* view = aKidFrame->GetView();
nsViewManager* vm = view->GetViewManager();
nsPoint pt;
nsView* ancestorView = parentFrame->GetClosestView(&pt);
if (ancestorView != view->GetParent()) {
NS_ASSERTION(ancestorView == view->GetParent()->GetParent(),
"Allowed only one anonymous view between frames");
// parentFrame is responsible for positioning aKidFrame's view
// explicitly
return;
}
pt += aKidFrame->GetPosition();
vm->MoveViewTo(view, pt.x, pt.y);
}
nsresult nsContainerFrame::ReparentFrameView(nsIFrame* aChildFrame,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame) {
MOZ_ASSERT(aChildFrame, "null child frame pointer");
MOZ_ASSERT(aOldParentFrame, "null old parent frame pointer");
MOZ_ASSERT(aNewParentFrame, "null new parent frame pointer");
MOZ_ASSERT(aOldParentFrame != aNewParentFrame,
"same old and new parent frame");
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsView* oldParentView = aOldParentFrame->GetClosestView();
nsView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
// They're not so we need to reparent any child views
aChildFrame->ReparentFrameViewTo(oldParentView->GetViewManager(),
newParentView, oldParentView);
}
return NS_OK;
}
nsresult nsContainerFrame::ReparentFrameViewList(
const nsFrameList& aChildFrameList, nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame) {
MOZ_ASSERT(aChildFrameList.NotEmpty(), "empty child frame list");
MOZ_ASSERT(aOldParentFrame, "null old parent frame pointer");
MOZ_ASSERT(aNewParentFrame, "null new parent frame pointer");
MOZ_ASSERT(aOldParentFrame != aNewParentFrame,
"same old and new parent frame");
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsView* oldParentView = aOldParentFrame->GetClosestView();
nsView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
nsViewManager* viewManager = oldParentView->GetViewManager();
// They're not so we need to reparent any child views
for (nsFrameList::Enumerator e(aChildFrameList); !e.AtEnd(); e.Next()) {
e.get()->ReparentFrameViewTo(viewManager, newParentView, oldParentView);
}
}
return NS_OK;
}
static nsIWidget* GetPresContextContainerWidget(nsPresContext* aPresContext) {
nsCOMPtr<nsISupports> container = aPresContext->Document()->GetContainer();
nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
if (!baseWindow) return nullptr;
nsCOMPtr<nsIWidget> mainWidget;
baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
return mainWidget;
}
static bool IsTopLevelWidget(nsIWidget* aWidget) {
nsWindowType windowType = aWidget->WindowType();
return windowType == eWindowType_toplevel ||
windowType == eWindowType_dialog || windowType == eWindowType_popup ||
windowType == eWindowType_sheet;
}
void nsContainerFrame::SyncWindowProperties(nsPresContext* aPresContext,
nsIFrame* aFrame, nsView* aView,
gfxContext* aRC, uint32_t aFlags) {
#ifdef MOZ_XUL
if (!aView || !nsCSSRendering::IsCanvasFrame(aFrame) || !aView->HasWidget())
return;
nsCOMPtr<nsIWidget> windowWidget =
GetPresContextContainerWidget(aPresContext);
if (!windowWidget || !IsTopLevelWidget(windowWidget)) return;
nsViewManager* vm = aView->GetViewManager();
nsView* rootView = vm->GetRootView();
if (aView != rootView) return;
Element* rootElement = aPresContext->Document()->GetRootElement();
if (!rootElement || !rootElement->IsXULElement()) {
// Scrollframes use native widgets which don't work well with
// translucent windows, at least in Windows XP. So if the document
// has a root scrollrame it's useless to try to make it transparent,
// we'll just get something broken.
// nsCSSFrameConstructor::ConstructRootFrame constructs root
// scrollframes whenever the root element is not a XUL element, so
// we test for that here. We can't just call
// presShell->GetRootScrollFrame() since that might not have
// been constructed yet.
// We can change this to allow translucent toplevel HTML documents
// (e.g. to do something like Dashboard widgets), once we
// have broad support for translucent scrolled documents, but be
// careful because apparently some Firefox extensions expect
// openDialog("something.html") to produce an opaque window
// even if the HTML doesn't have a background-color set.
return;
}
nsIFrame* rootFrame =
aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
if (!rootFrame) return;
if (aFlags & SET_ASYNC) {
aView->SetNeedsWindowPropertiesSync();
return;
}
RefPtr<nsPresContext> kungFuDeathGrip(aPresContext);
AutoWeakFrame weak(rootFrame);
nsTransparencyMode mode =
nsLayoutUtils::GetFrameTransparency(aFrame, rootFrame);
int32_t shadow = rootFrame->StyleUIReset()->mWindowShadow;
nsCOMPtr<nsIWidget> viewWidget = aView->GetWidget();
viewWidget->SetTransparencyMode(mode);
windowWidget->SetWindowShadowStyle(shadow);
if (!aRC) return;
if (!weak.IsAlive()) {
return;
}
nsBoxLayoutState aState(aPresContext, aRC);
nsSize minSize = rootFrame->GetXULMinSize(aState);
nsSize maxSize = rootFrame->GetXULMaxSize(aState);
SetSizeConstraints(aPresContext, windowWidget, minSize, maxSize);
#endif
}
void nsContainerFrame::SetSizeConstraints(nsPresContext* aPresContext,
nsIWidget* aWidget,
const nsSize& aMinSize,
const nsSize& aMaxSize) {
LayoutDeviceIntSize devMinSize(
aPresContext->AppUnitsToDevPixels(aMinSize.width),
aPresContext->AppUnitsToDevPixels(aMinSize.height));
LayoutDeviceIntSize devMaxSize(
aMaxSize.width == NS_INTRINSICSIZE
? NS_MAXSIZE
: aPresContext->AppUnitsToDevPixels(aMaxSize.width),
aMaxSize.height == NS_INTRINSICSIZE
? NS_MAXSIZE
: aPresContext->AppUnitsToDevPixels(aMaxSize.height));
// MinSize has a priority over MaxSize
if (devMinSize.width > devMaxSize.width) devMaxSize.width = devMinSize.width;
if (devMinSize.height > devMaxSize.height)
devMaxSize.height = devMinSize.height;
widget::SizeConstraints constraints(devMinSize, devMaxSize);
// The sizes are in inner window sizes, so convert them into outer window
// sizes. Use a size of (200, 200) as only the difference between the inner
// and outer size is needed.
LayoutDeviceIntSize windowSize =
aWidget->ClientToWindowSize(LayoutDeviceIntSize(200, 200));
if (constraints.mMinSize.width)
constraints.mMinSize.width += windowSize.width - 200;
if (constraints.mMinSize.height)
constraints.mMinSize.height += windowSize.height - 200;
if (constraints.mMaxSize.width != NS_MAXSIZE)
constraints.mMaxSize.width += windowSize.width - 200;
if (constraints.mMaxSize.height != NS_MAXSIZE)
constraints.mMaxSize.height += windowSize.height - 200;
aWidget->SetSizeConstraints(constraints);
}
void nsContainerFrame::SyncFrameViewAfterReflow(
nsPresContext* aPresContext, nsIFrame* aFrame, nsView* aView,
const nsRect& aVisualOverflowArea, uint32_t aFlags) {
if (!aView) {
return;
}
// Make sure the view is sized and positioned correctly
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aFrame);
}
if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) {
nsViewManager* vm = aView->GetViewManager();
vm->ResizeView(aView, aVisualOverflowArea, true);
}
}
static nscoord GetCoord(const LengthPercentage& aCoord, nscoord aIfNotCoord) {
if (aCoord.ConvertsToLength()) {
return aCoord.ToLength();
}
return aIfNotCoord;
}
static nscoord GetCoord(const LengthPercentageOrAuto& aCoord,
nscoord aIfNotCoord) {
if (aCoord.IsAuto()) {
return aIfNotCoord;
}
return GetCoord(aCoord.AsLengthPercentage(), aIfNotCoord);
}
void nsContainerFrame::DoInlineIntrinsicISize(
gfxContext* aRenderingContext, InlineIntrinsicISizeData* aData,
nsLayoutUtils::IntrinsicISizeType aType) {
if (GetPrevInFlow()) return; // Already added.
MOZ_ASSERT(
aType == nsLayoutUtils::MIN_ISIZE || aType == nsLayoutUtils::PREF_ISIZE,
"bad type");
WritingMode wm = GetWritingMode();
mozilla::Side startSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeStart);
mozilla::Side endSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeEnd);
const nsStylePadding* stylePadding = StylePadding();
const nsStyleBorder* styleBorder = StyleBorder();
const nsStyleMargin* styleMargin = StyleMargin();
// This goes at the beginning no matter how things are broken and how
// messy the bidi situations are, since per CSS2.1 section 8.6
// (implemented in bug 328168), the startSide border is always on the
// first line.
// This frame is a first-in-flow, but it might have a previous bidi
// continuation, in which case that continuation should handle the startSide
// border.
// For box-decoration-break:clone we setup clonePBM = startPBM + endPBM and
// add that to each line. For box-decoration-break:slice clonePBM is zero.
nscoord clonePBM = 0; // PBM = PaddingBorderMargin
const bool sliceBreak =
styleBorder->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice;
if (!GetPrevContinuation()) {
nscoord startPBM =
// clamp negative calc() to 0
std::max(GetCoord(stylePadding->mPadding.Get(startSide), 0), 0) +
styleBorder->GetComputedBorderWidth(startSide) +
GetCoord(styleMargin->mMargin.Get(startSide), 0);
if (MOZ_LIKELY(sliceBreak)) {
aData->mCurrentLine += startPBM;
} else {
clonePBM = startPBM;
}
}
nscoord endPBM =
// clamp negative calc() to 0
std::max(GetCoord(stylePadding->mPadding.Get(endSide), 0), 0) +
styleBorder->GetComputedBorderWidth(endSide) +
GetCoord(styleMargin->mMargin.Get(endSide), 0);
if (MOZ_UNLIKELY(!sliceBreak)) {
clonePBM += endPBM;
}
const nsLineList_iterator* savedLine = aData->mLine;
nsIFrame* const savedLineContainer = aData->LineContainer();
nsContainerFrame* lastInFlow;
for (nsContainerFrame* nif = this; nif;
nif = static_cast<nsContainerFrame*>(nif->GetNextInFlow())) {
if (aData->mCurrentLine == 0) {
aData->mCurrentLine = clonePBM;
}
for (nsIFrame* kid : nif->mFrames) {
if (aType == nsLayoutUtils::MIN_ISIZE)
kid->AddInlineMinISize(aRenderingContext,
static_cast<InlineMinISizeData*>(aData));
else
kid->AddInlinePrefISize(aRenderingContext,
static_cast<InlinePrefISizeData*>(aData));
}
// After we advance to our next-in-flow, the stored line and line container
// may no longer be correct. Just forget them.
aData->mLine = nullptr;
aData->SetLineContainer(nullptr);
lastInFlow = nif;
}
aData->mLine = savedLine;
aData->SetLineContainer(savedLineContainer);
// This goes at the end no matter how things are broken and how
// messy the bidi situations are, since per CSS2.1 section 8.6
// (implemented in bug 328168), the endSide border is always on the
// last line.
// We reached the last-in-flow, but it might have a next bidi
// continuation, in which case that continuation should handle
// the endSide border.
if (MOZ_LIKELY(!lastInFlow->GetNextContinuation() && sliceBreak)) {
aData->mCurrentLine += endPBM;
}
}
/* virtual */
LogicalSize nsContainerFrame::ComputeAutoSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorder, const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
nscoord availBased = aAvailableISize - aMargin.ISize(aWM) -
aBorder.ISize(aWM) - aPadding.ISize(aWM);
// replaced elements always shrink-wrap
if ((aFlags & ComputeSizeFlags::eShrinkWrap) || IsFrameOfType(eReplaced)) {
// Only bother computing our 'auto' ISize if the result will be used.
// It'll be used under two scenarios:
// - If our ISize property is itself 'auto'.
// - If we're using flex-basis in place of our ISize property (i.e. we're a
// flex item with our inline axis being the main axis), AND we have
// flex-basis:content.
const nsStylePosition* pos = StylePosition();
if (pos->ISize(aWM).IsAuto() ||
(pos->mFlexBasis.IsContent() && IsFlexItem() &&
nsFlexContainerFrame::IsItemInlineAxisMainAxis(this))) {
result.ISize(aWM) =
ShrinkWidthToFit(aRenderingContext, availBased, aFlags);
}
} else {
result.ISize(aWM) = availBased;
}
if (IsTableCaption()) {
// If we're a container for font size inflation, then shrink
// wrapping inside of us should not apply font size inflation.
AutoMaybeDisableFontInflation an(this);
WritingMode tableWM = GetParent()->GetWritingMode();
uint8_t captionSide = StyleTableBorder()->mCaptionSide;
if (aWM.IsOrthogonalTo(tableWM)) {
if (captionSide == NS_STYLE_CAPTION_SIDE_TOP ||
captionSide == NS_STYLE_CAPTION_SIDE_TOP_OUTSIDE ||
captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM ||
captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM_OUTSIDE) {
// For an orthogonal caption on a block-dir side of the table,
// shrink-wrap to min-isize.
result.ISize(aWM) = GetMinISize(aRenderingContext);
} else {
// An orthogonal caption on an inline-dir side of the table
// is constrained to the containing block.
nscoord pref = GetPrefISize(aRenderingContext);
if (pref > aCBSize.ISize(aWM)) {
pref = aCBSize.ISize(aWM);
}
if (pref < result.ISize(aWM)) {
result.ISize(aWM) = pref;
}
}
} else {
if (captionSide == NS_STYLE_CAPTION_SIDE_LEFT ||
captionSide == NS_STYLE_CAPTION_SIDE_RIGHT) {
result.ISize(aWM) = GetMinISize(aRenderingContext);
} else if (captionSide == NS_STYLE_CAPTION_SIDE_TOP ||
captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM) {
// The outer frame constrains our available isize to the isize of
// the table. Grow if our min-isize is bigger than that, but not
// larger than the containing block isize. (It would really be nice
// to transmit that information another way, so we could grow up to
// the table's available isize, but that's harder.)
nscoord min = GetMinISize(aRenderingContext);
if (min > aCBSize.ISize(aWM)) {
min = aCBSize.ISize(aWM);
}
if (min > result.ISize(aWM)) {
result.ISize(aWM) = min;
}
}
}
}
return result;
}
void nsContainerFrame::ReflowChild(
nsIFrame* aKidFrame, nsPresContext* aPresContext,
ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput,
const WritingMode& aWM, const LogicalPoint& aPos,
const nsSize& aContainerSize, uint32_t aFlags, nsReflowStatus& aStatus,
nsOverflowContinuationTracker* aTracker) {
MOZ_ASSERT(aReflowInput.mFrame == aKidFrame, "bad reflow state");
if (aWM.IsVerticalRL() || (!aWM.IsVertical() && !aWM.IsBidiLTR())) {
NS_ASSERTION(aContainerSize.width != NS_UNCONSTRAINEDSIZE,
"ReflowChild with unconstrained container width!");
}
MOZ_ASSERT(aDesiredSize.VisualOverflow() == nsRect(0, 0, 0, 0) &&
aDesiredSize.ScrollableOverflow() == nsRect(0, 0, 0, 0),
"please reset the overflow areas before calling ReflowChild");
// Position the child frame and its view if requested.
if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
aKidFrame->SetPosition(aWM, aPos, aContainerSize);
}
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aKidFrame);
PositionChildViews(aKidFrame);
}
// Reflow the child frame
aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
// If the child frame is complete, delete any next-in-flows,
// but only if the NO_DELETE_NEXT_IN_FLOW flag isn't set.
if (!aStatus.IsInlineBreakBefore() && aStatus.IsFullyComplete() &&
!(aFlags & NS_FRAME_NO_DELETE_NEXT_IN_FLOW_CHILD)) {
nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow();
if (kidNextInFlow) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
nsOverflowContinuationTracker::AutoFinish fini(aTracker, aKidFrame);
kidNextInFlow->GetParent()->DeleteNextInFlowChild(kidNextInFlow, true);
}
}
}
// XXX temporary: hold on to a copy of the old physical version of
// ReflowChild so that we can convert callers incrementally.
void nsContainerFrame::ReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput, nscoord aX,
nscoord aY, uint32_t aFlags,
nsReflowStatus& aStatus,
nsOverflowContinuationTracker* aTracker) {
MOZ_ASSERT(aReflowInput.mFrame == aKidFrame, "bad reflow state");
// Position the child frame and its view if requested.
if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
aKidFrame->SetPosition(nsPoint(aX, aY));
}
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aKidFrame);
PositionChildViews(aKidFrame);
}
// Reflow the child frame
aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
// If the child frame is complete, delete any next-in-flows,
// but only if the NO_DELETE_NEXT_IN_FLOW flag isn't set.
if (aStatus.IsFullyComplete() &&
!(aFlags & NS_FRAME_NO_DELETE_NEXT_IN_FLOW_CHILD)) {
nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow();
if (kidNextInFlow) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
nsOverflowContinuationTracker::AutoFinish fini(aTracker, aKidFrame);
kidNextInFlow->GetParent()->DeleteNextInFlowChild(kidNextInFlow, true);
}
}
}
/**
* Position the views of |aFrame|'s descendants. A container frame
* should call this method if it moves a frame after |Reflow|.
*/
void nsContainerFrame::PositionChildViews(nsIFrame* aFrame) {
if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
return;
}
// Recursively walk aFrame's child frames.
// Process the additional child lists, but skip the popup list as the
// view for popups is managed by the parent. Currently only nsMenuFrame
// and nsPopupSetFrame have a popupList and during layout will adjust the
// view manually to position the popup.
ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
if (lists.CurrentID() == kPopupList) {
continue;
}
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
// Position the frame's view (if it has one) otherwise recursively
// process its children
nsIFrame* childFrame = childFrames.get();
if (childFrame->HasView()) {
PositionFrameView(childFrame);
} else {
PositionChildViews(childFrame);
}
}
}
}
/**
* The second half of frame reflow. Does the following:
* - sets the frame's bounds
* - sizes and positions (if requested) the frame's view. If the frame's final
* position differs from the current position and the frame itself does not
* have a view, then any child frames with views are positioned so they stay
* in sync
* - sets the view's visibility, opacity, content transparency, and clip
* - invoked the DidReflow() function
*
* Flags:
* NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
* case. Also implies NS_FRAME_NO_MOVE_VIEW
* NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
* don't want to automatically sync the frame and view
* NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
*/
/**
* De-optimize function to work around a VC2017 15.5+ compiler bug:
* https://bugzil.la/1424281#c12
*/
#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64)
# pragma optimize("g", off)
#endif
void nsContainerFrame::FinishReflowChild(
nsIFrame* aKidFrame, nsPresContext* aPresContext,
const ReflowOutput& aDesiredSize, const ReflowInput* aReflowInput,
const WritingMode& aWM, const LogicalPoint& aPos,
const nsSize& aContainerSize, uint32_t aFlags) {
if (aWM.IsVerticalRL() || (!aWM.IsVertical() && !aWM.IsBidiLTR())) {
NS_ASSERTION(aContainerSize.width != NS_UNCONSTRAINEDSIZE,
"FinishReflowChild with unconstrained container width!");
}
nsPoint curOrigin = aKidFrame->GetPosition();
WritingMode outerWM = aDesiredSize.GetWritingMode();
LogicalSize convertedSize =
aDesiredSize.Size(outerWM).ConvertTo(aWM, outerWM);
if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
aKidFrame->SetRect(aWM, LogicalRect(aWM, aPos, convertedSize),
aContainerSize);
} else {
aKidFrame->SetSize(aWM, convertedSize);
}
if (aKidFrame->HasView()) {
nsView* view = aKidFrame->GetView();
// Make sure the frame's view is properly sized and positioned and has
// things like opacity correct
SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
aDesiredSize.VisualOverflow(), aFlags);
}
nsPoint newOrigin = aKidFrame->GetPosition();
if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) && curOrigin != newOrigin) {
if (!aKidFrame->HasView()) {
// If the frame has moved, then we need to make sure any child views are
// correctly positioned
PositionChildViews(aKidFrame);
}
}
aKidFrame->DidReflow(aPresContext, aReflowInput);
}
#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_AMD64)
# pragma optimize("", on)
#endif
// XXX temporary: hold on to a copy of the old physical version of
// FinishReflowChild so that we can convert callers incrementally.
void nsContainerFrame::FinishReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
const ReflowOutput& aDesiredSize,
const ReflowInput* aReflowInput,
nscoord aX, nscoord aY,
uint32_t aFlags) {
nsPoint curOrigin = aKidFrame->GetPosition();
if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
aKidFrame->SetRect(
nsRect(aX, aY, aDesiredSize.Width(), aDesiredSize.Height()));
} else {
aKidFrame->SetSize(nsSize(aDesiredSize.Width(), aDesiredSize.Height()));
}
if (aKidFrame->HasView()) {
nsView* view = aKidFrame->GetView();
// Make sure the frame's view is properly sized and positioned and has
// things like opacity correct
SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
aDesiredSize.VisualOverflow(), aFlags);
}
if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) &&
(curOrigin.x != aX || curOrigin.y != aY)) {
if (!aKidFrame->HasView()) {
// If the frame has moved, then we need to make sure any child views are
// correctly positioned
PositionChildViews(aKidFrame);
}
}
aKidFrame->DidReflow(aPresContext, aReflowInput);
}
void nsContainerFrame::ReflowOverflowContainerChildren(
nsPresContext* aPresContext, const ReflowInput& aReflowInput,
nsOverflowAreas& aOverflowRects, uint32_t aFlags, nsReflowStatus& aStatus,
ChildFrameMerger aMergeFunc) {
MOZ_ASSERT(aPresContext, "null pointer");
nsFrameList* overflowContainers =
DrainExcessOverflowContainersList(aMergeFunc);
if (!overflowContainers) {
return; // nothing to reflow
}
nsOverflowContinuationTracker tracker(this, false, false);
bool shouldReflowAllKids = aReflowInput.ShouldReflowAllKids();
for (nsIFrame* frame : *overflowContainers) {
if (frame->GetPrevInFlow()->GetParent() != GetPrevInFlow()) {
// frame's prevInFlow has moved, skip reflowing this frame;
// it will get reflowed once it's been placed
if (GetNextInFlow()) {
// We report OverflowIncomplete status in this case to avoid our parent
// deleting our next-in-flows which might destroy non-empty frames.
nsReflowStatus status;
status.SetOverflowIncomplete();
aStatus.MergeCompletionStatusFrom(status);
}
continue;
}
// If the available vertical height has changed, we need to reflow
// even if the frame isn't dirty.
if (shouldReflowAllKids || NS_SUBTREE_DIRTY(frame)) {
// Get prev-in-flow
nsIFrame* prevInFlow = frame->GetPrevInFlow();
NS_ASSERTION(prevInFlow,
"overflow container frame must have a prev-in-flow");
NS_ASSERTION(
frame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER,
"overflow container frame must have overflow container bit set");
WritingMode wm = frame->GetWritingMode();
nsSize containerSize = aReflowInput.AvailableSize(wm).GetPhysicalSize(wm);
LogicalRect prevRect = prevInFlow->GetLogicalRect(wm, containerSize);
// Initialize reflow params
LogicalSize availSpace(wm, prevRect.ISize(wm),
aReflowInput.AvailableSize(wm).BSize(wm));
ReflowOutput desiredSize(aReflowInput);
ReflowInput frameState(aPresContext, aReflowInput, frame, availSpace);
nsReflowStatus frameStatus;
// Reflow
LogicalPoint pos(wm, prevRect.IStart(wm), 0);
ReflowChild(frame, aPresContext, desiredSize, frameState, wm, pos,
containerSize, aFlags, frameStatus, &tracker);
// XXXfr Do we need to override any shrinkwrap effects here?
// e.g. desiredSize.Width() = prevRect.width;
FinishReflowChild(frame, aPresContext, desiredSize, &frameState, wm, pos,
containerSize, aFlags);
// Handle continuations
if (!frameStatus.IsFullyComplete()) {
if (frame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
// Abspos frames can't cause their parent to be incomplete,
// only overflow incomplete.
frameStatus.SetOverflowIncomplete();
} else {
NS_ASSERTION(frameStatus.IsComplete(),
"overflow container frames can't be incomplete, only "
"overflow-incomplete");
}
// Acquire a next-in-flow, creating it if necessary
nsIFrame* nif = frame->GetNextInFlow();
if (!nif) {
NS_ASSERTION(frameStatus.NextInFlowNeedsReflow(),
"Someone forgot a NextInFlowNeedsReflow flag");
nif = aPresContext->PresShell()
->FrameConstructor()
->CreateContinuingFrame(aPresContext, frame, this);
} else if (!(nif->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
// used to be a normal next-in-flow; steal it from the child list
nsresult rv = nif->GetParent()->StealFrame(nif);
if (NS_FAILED(rv)) {
return;
}
}
tracker.Insert(nif, frameStatus);
}
aStatus.MergeCompletionStatusFrom(frameStatus);
// At this point it would be nice to assert
// !frame->GetOverflowRect().IsEmpty(), but we have some unsplittable
// frames that, when taller than availableHeight will push zero-height
// content into a next-in-flow.
} else {
tracker.Skip(frame, aStatus);
if (aReflowInput.mFloatManager) {
nsBlockFrame::RecoverFloatsFor(frame, *aReflowInput.mFloatManager,
aReflowInput.GetWritingMode(),
aReflowInput.ComputedPhysicalSize());
}
}
ConsiderChildOverflow(aOverflowRects, frame);
}
}
void nsContainerFrame::DisplayOverflowContainers(
nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) {
nsFrameList* overflowconts = GetPropTableFrames(OverflowContainersProperty());
if (overflowconts) {
for (nsIFrame* frame : *overflowconts) {
BuildDisplayListForChild(aBuilder, frame, aLists);
}
}
}
static bool TryRemoveFrame(nsIFrame* aFrame,
nsContainerFrame::FrameListPropertyDescriptor aProp,
nsIFrame* aChildToRemove) {
nsFrameList* list = aFrame->GetProperty(aProp);
if (list && list->StartRemoveFrame(aChildToRemove)) {
// aChildToRemove *may* have been removed from this list.
if (list->IsEmpty()) {
aFrame->RemoveProperty(aProp);
list->Delete(aFrame->PresShell());
}
return true;
}
return false;
}
bool nsContainerFrame::MaybeStealOverflowContainerFrame(nsIFrame* aChild) {
bool removed = false;
if (MOZ_UNLIKELY(aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
// Try removing from the overflow container list.
removed = ::TryRemoveFrame(this, OverflowContainersProperty(), aChild);
if (!removed) {
// It might be in the excess overflow container list.
removed =
::TryRemoveFrame(this, ExcessOverflowContainersProperty(), aChild);
}
}
return removed;
}
nsresult nsContainerFrame::StealFrame(nsIFrame* aChild) {
#ifdef DEBUG
if (!mFrames.ContainsFrame(aChild)) {
nsFrameList* list = GetOverflowFrames();
if (!list || !list->ContainsFrame(aChild)) {
list = GetProperty(OverflowContainersProperty());
if (!list || !list->ContainsFrame(aChild)) {
list = GetProperty(ExcessOverflowContainersProperty());
MOZ_ASSERT(list && list->ContainsFrame(aChild),
"aChild isn't our child"
" or on a frame list not supported by StealFrame");
}
}
}
#endif
bool removed = MaybeStealOverflowContainerFrame(aChild);
if (!removed) {
// NOTE nsColumnSetFrame and nsCanvasFrame have their overflow containers
// on the normal lists so we might get here also if the frame bit
// NS_FRAME_IS_OVERFLOW_CONTAINER is set.
removed = mFrames.StartRemoveFrame(aChild);
if (!removed) {
// We didn't find the child in our principal child list.
// Maybe it's on the overflow list?
nsFrameList* frameList = GetOverflowFrames();
if (frameList) {
removed = frameList->ContinueRemoveFrame(aChild);
if (frameList->IsEmpty()) {
DestroyOverflowList();
}
}
}
}
MOZ_ASSERT(removed, "StealFrame: can't find aChild");
return removed ? NS_OK : NS_ERROR_UNEXPECTED;
}
nsFrameList nsContainerFrame::StealFramesAfter(nsIFrame* aChild) {
NS_ASSERTION(
!aChild || !(aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER),
"StealFramesAfter doesn't handle overflow containers");
NS_ASSERTION(!IsBlockFrame(), "unexpected call");
if (!aChild) {
nsFrameList copy(mFrames);
mFrames.Clear();
return copy;
}
for (nsFrameList::FrameLinkEnumerator iter(mFrames); !iter.AtEnd();
iter.Next()) {
if (iter.PrevFrame() == aChild) {
return mFrames.ExtractTail(iter);
}
}
// We didn't find the child in the principal child list.
// Maybe it's on the overflow list?
nsFrameList* overflowFrames = GetOverflowFrames();
if (overflowFrames) {
for (nsFrameList::FrameLinkEnumerator iter(*overflowFrames); !iter.AtEnd();
iter.Next()) {
if (iter.PrevFrame() == aChild) {
return overflowFrames->ExtractTail(iter);
}
}
}
NS_ERROR("StealFramesAfter: can't find aChild");
return nsFrameList::EmptyList();
}
/*
* Create a next-in-flow for aFrame. Will return the newly created
* frame <b>if and only if</b> a new frame is created; otherwise
* nullptr is returned.
*/
nsIFrame* nsContainerFrame::CreateNextInFlow(nsIFrame* aFrame) {
MOZ_ASSERT(
!IsBlockFrame(),
"you should have called nsBlockFrame::CreateContinuationFor instead");
MOZ_ASSERT(mFrames.ContainsFrame(aFrame), "expected an in-flow child frame");
nsPresContext* pc = PresContext();
nsIFrame* nextInFlow = aFrame->GetNextInFlow();
if (nullptr == nextInFlow) {
// Create a continuation frame for the child frame and insert it
// into our child list.
nextInFlow = pc->PresShell()->FrameConstructor()->CreateContinuingFrame(
pc, aFrame, this);
mFrames.InsertFrame(nullptr, aFrame, nextInFlow);
NS_FRAME_LOG(NS_FRAME_TRACE_NEW_FRAMES,
("nsContainerFrame::CreateNextInFlow: frame=%p nextInFlow=%p",
aFrame, nextInFlow));
return nextInFlow;
}
return nullptr;
}
/**
* Remove and delete aNextInFlow and its next-in-flows. Updates the sibling and
* flow pointers
*/
void nsContainerFrame::DeleteNextInFlowChild(nsIFrame* aNextInFlow,
bool aDeletingEmptyFrames) {
#ifdef DEBUG
nsIFrame* prevInFlow = aNextInFlow->GetPrevInFlow();
#endif
MOZ_ASSERT(prevInFlow, "bad prev-in-flow");
// If the next-in-flow has a next-in-flow then delete it, too (and
// delete it first).
// Do this in a loop so we don't overflow the stack for frames
// with very many next-in-flows
nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow();
if (nextNextInFlow) {
AutoTArray<nsIFrame*, 8> frames;
for (nsIFrame* f = nextNextInFlow; f; f = f->GetNextInFlow()) {
frames.AppendElement(f);
}
for (nsIFrame* delFrame : Reversed(frames)) {
delFrame->GetParent()->DeleteNextInFlowChild(delFrame,
aDeletingEmptyFrames);
}
}
// Take the next-in-flow out of the parent's child list
DebugOnly<nsresult> rv = StealFrame(aNextInFlow);
NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failure");
#ifdef DEBUG
if (aDeletingEmptyFrames) {
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(aNextInFlow);
}
#endif
// Delete the next-in-flow frame and its descendants. This will also
// remove it from its next-in-flow/prev-in-flow chain.
aNextInFlow->Destroy();
MOZ_ASSERT(!prevInFlow->GetNextInFlow(), "non null next-in-flow");
}
/**
* Set the frames on the overflow list
*/
void nsContainerFrame::SetOverflowFrames(const nsFrameList& aOverflowFrames) {
MOZ_ASSERT(aOverflowFrames.NotEmpty(), "Shouldn't be called");
nsPresContext* pc = PresContext();
nsFrameList* newList = new (pc->PresShell()) nsFrameList(aOverflowFrames);
SetProperty(OverflowProperty(), newList);
}
nsFrameList* nsContainerFrame::GetPropTableFrames(
FrameListPropertyDescriptor aProperty) const {
return GetProperty(aProperty);
}
nsFrameList* nsContainerFrame::RemovePropTableFrames(
FrameListPropertyDescriptor aProperty) {
return RemoveProperty(aProperty);
}
void nsContainerFrame::SetPropTableFrames(
nsFrameList* aFrameList, FrameListPropertyDescriptor aProperty) {
MOZ_ASSERT(aProperty && aFrameList, "null ptr");
MOZ_ASSERT(
(aProperty != nsContainerFrame::OverflowContainersProperty() &&
aProperty != nsContainerFrame::ExcessOverflowContainersProperty()) ||
IsFrameOfType(nsIFrame::eCanContainOverflowContainers),
"this type of frame can't have overflow containers");
MOZ_ASSERT(!GetPropTableFrames(aProperty));
SetProperty(aProperty, aFrameList);
}
void nsContainerFrame::PushChildrenToOverflow(nsIFrame* aFromChild,
nsIFrame* aPrevSibling) {
MOZ_ASSERT(aFromChild, "null pointer");
MOZ_ASSERT(aPrevSibling, "pushing first child");
MOZ_ASSERT(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
// Add the frames to our overflow list (let our next in flow drain
// our overflow list when it is ready)
SetOverflowFrames(mFrames.RemoveFramesAfter(aPrevSibling));
}
void nsContainerFrame::PushChildren(nsIFrame* aFromChild,
nsIFrame* aPrevSibling) {
MOZ_ASSERT(aFromChild, "null pointer");
MOZ_ASSERT(aPrevSibling, "pushing first child");
MOZ_ASSERT(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
// Disconnect aFromChild from its previous sibling
nsFrameList tail = mFrames.RemoveFramesAfter(aPrevSibling);
nsContainerFrame* nextInFlow =
static_cast<nsContainerFrame*>(GetNextInFlow());
if (nextInFlow) {
// XXX This is not a very good thing to do. If it gets removed
// then remove the copy of this routine that doesn't do this from
// nsInlineFrame.
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
for (nsIFrame* f = aFromChild; f; f = f->GetNextSibling()) {
nsContainerFrame::ReparentFrameView(f, this, nextInFlow);
}
nextInFlow->mFrames.InsertFrames(nextInFlow, nullptr, tail);
} else {
// Add the frames to our overflow list
SetOverflowFrames(tail);
}
}
bool nsContainerFrame::MoveOverflowToChildList() {
bool result = false;
// Check for an overflow list with our prev-in-flow
nsContainerFrame* prevInFlow = (nsContainerFrame*)GetPrevInFlow();
if (nullptr != prevInFlow) {
AutoFrameListPtr prevOverflowFrames(PresContext(),
prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Tables are special; they can have repeated header/footer
// frames on mFrames at this point.
NS_ASSERTION(mFrames.IsEmpty() || IsTableFrame(), "bad overflow list");
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
this);
mFrames.AppendFrames(this, *prevOverflowFrames);
result = true;
}
}
// It's also possible that we have an overflow list for ourselves.
return DrainSelfOverflowList() || result;
}
bool nsContainerFrame::MoveInlineOverflowToChildList(nsIFrame* aLineContainer) {
MOZ_ASSERT(aLineContainer,
"Must have line container for moving inline overflows");
bool result = false;
// Check for an overflow list with our prev-in-flow
if (auto prevInFlow = static_cast<nsContainerFrame*>(GetPrevInFlow())) {
AutoFrameListPtr prevOverflowFrames(PresContext(),
prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// We may need to reparent floats from prev-in-flow to our line
// container if the container has prev continuation.
if (aLineContainer->GetPrevContinuation()) {
ReparentFloatsForInlineChild(aLineContainer,
prevOverflowFrames->FirstChild(), true,
ReparentingDirection::Forwards);
}
// When pushing and pulling frames we need to check for whether
// any views need to be reparented.
nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
this);
// Prepend overflow frames to the list.
mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
result = true;
}
}
// It's also possible that we have overflow list for ourselves.
return DrainSelfOverflowList() || result;
}
bool nsContainerFrame::DrainSelfOverflowList() {
AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
if (overflowFrames) {
mFrames.AppendFrames(nullptr, *overflowFrames);
return true;
}
return false;
}
nsFrameList* nsContainerFrame::DrainExcessOverflowContainersList(
ChildFrameMerger aMergeFunc) {
nsFrameList* overflowContainers =
GetPropTableFrames(OverflowContainersProperty());
NS_ASSERTION(!(overflowContainers && GetPrevInFlow() &&
static_cast<nsContainerFrame*>(GetPrevInFlow())
->GetPropTableFrames(ExcessOverflowContainersProperty())),
"conflicting overflow containers lists");
if (!overflowContainers) {
// Drain excess from previnflow
nsContainerFrame* prev = (nsContainerFrame*)GetPrevInFlow();
if (prev) {
nsFrameList* excessFrames =
prev->RemovePropTableFrames(ExcessOverflowContainersProperty());
if (excessFrames) {
excessFrames->ApplySetParent(this);
nsContainerFrame::ReparentFrameViewList(*excessFrames, prev, this);
overflowContainers = excessFrames;
SetPropTableFrames(overflowContainers, OverflowContainersProperty());
}
}
}
// Our own excess overflow containers from a previous reflow can still be
// present if our next-in-flow hasn't been reflown yet. Move any children
// from it that don't have a continuation in this frame to the
// OverflowContainers list.
nsFrameList* selfExcessOCFrames =
RemovePropTableFrames(ExcessOverflowContainersProperty());
if (selfExcessOCFrames) {
nsFrameList toMove;
auto child = selfExcessOCFrames->FirstChild();
while (child) {
auto next = child->GetNextSibling();
MOZ_ASSERT(child->GetPrevInFlow(),
"ExcessOverflowContainers frames must be continuations");
if (child->GetPrevInFlow()->GetParent() != this) {
selfExcessOCFrames->RemoveFrame(child);
toMove.AppendFrame(nullptr, child);
}
child = next;
}
if (toMove.IsEmpty()) {
SetPropTableFrames(selfExcessOCFrames,
ExcessOverflowContainersProperty());
} else if (overflowContainers) {
aMergeFunc(*overflowContainers, toMove, this);
if (selfExcessOCFrames->IsEmpty()) {
selfExcessOCFrames->Delete(PresShell());
} else {
SetPropTableFrames(selfExcessOCFrames,
ExcessOverflowContainersProperty());
}
} else {
if (selfExcessOCFrames->IsEmpty()) {
*selfExcessOCFrames = toMove;
overflowContainers = selfExcessOCFrames;
} else {
SetPropTableFrames(selfExcessOCFrames,
ExcessOverflowContainersProperty());
auto shell = PresShell();
overflowContainers = new (shell) nsFrameList(toMove);
}
SetPropTableFrames(overflowContainers, OverflowContainersProperty());
}
}
return overflowContainers;
}
nsIFrame* nsContainerFrame::GetNextInFlowChild(
ContinuationTraversingState& aState, bool* aIsInOverflow) {
nsContainerFrame*& nextInFlow = aState.mNextInFlow;
while (nextInFlow) {
// See if there is any frame in the container
nsIFrame* frame = nextInFlow->mFrames.FirstChild();
if (frame) {
if (aIsInOverflow) {
*aIsInOverflow = false;
}
return frame;
}
// No frames in the principal list, try its overflow list
nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames();
if (overflowFrames) {
if (aIsInOverflow) {
*aIsInOverflow = true;
}
return overflowFrames->FirstChild();
}
nextInFlow = static_cast<nsContainerFrame*>(nextInFlow->GetNextInFlow());
}
return nullptr;
}
nsIFrame* nsContainerFrame::PullNextInFlowChild(
ContinuationTraversingState& aState) {
bool isInOverflow;
nsIFrame* frame = GetNextInFlowChild(aState, &isInOverflow);
if (frame) {
nsContainerFrame* nextInFlow = aState.mNextInFlow;
if (isInOverflow) {
nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames();
overflowFrames->RemoveFirstChild();
if (overflowFrames->IsEmpty()) {
nextInFlow->DestroyOverflowList();
}
} else {
nextInFlow->mFrames.RemoveFirstChild();
}
// Move the frame to the principal frame list of this container
mFrames.AppendFrame(this, frame);
// AppendFrame has reparented the frame, we need
// to reparent the frame view then.
nsContainerFrame::ReparentFrameView(frame, nextInFlow, this);
}
return frame;
}
/* static */
void nsContainerFrame::ReparentFloatsForInlineChild(
nsIFrame* aOurLineContainer, nsIFrame* aFrame, bool aReparentSiblings,
ReparentingDirection aDirection) {
// XXXbz this would be better if it took a nsFrameList or a frame
// list slice....
NS_ASSERTION(aOurLineContainer->GetNextContinuation() ||
aOurLineContainer->GetPrevContinuation(),
"Don't call this when we have no continuation, it's a waste");
if (!aFrame) {
NS_ASSERTION(aReparentSiblings, "Why did we get called?");
return;
}
nsBlockFrame* frameBlock = nsLayoutUtils::GetFloatContainingBlock(aFrame);
if (!frameBlock || frameBlock == aOurLineContainer) {
return;
}
nsBlockFrame* ourBlock = do_QueryFrame(aOurLineContainer);
NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
while (true) {
ourBlock->ReparentFloats(aFrame, frameBlock, false, aDirection);
if (!aReparentSiblings) return;
nsIFrame* next = aFrame->GetNextSibling();
if (!next) return;
if (next->GetParent() == aFrame->GetParent()) {
aFrame = next;
continue;
}
// This is paranoid and will hardly ever get hit ... but we can't actually
// trust that the frames in the sibling chain all have the same parent,
// because lazy reparenting may be going on. If we find a different
// parent we need to redo our analysis.
ReparentFloatsForInlineChild(aOurLineContainer, next, aReparentSiblings,
aDirection);
return;
}
}
bool nsContainerFrame::ResolvedOrientationIsVertical() {
StyleOrient orient = StyleDisplay()->mOrient;
switch (orient) {
case StyleOrient::Horizontal:
return false;
case StyleOrient::Vertical:
return true;
case StyleOrient::Inline:
return GetWritingMode().IsVertical();
case StyleOrient::Block:
return !GetWritingMode().IsVertical();
}
MOZ_ASSERT_UNREACHABLE("unexpected -moz-orient value");
return false;
}
uint16_t nsContainerFrame::CSSAlignmentForAbsPosChild(
const ReflowInput& aChildRI, LogicalAxis aLogicalAxis) const {
MOZ_ASSERT(aChildRI.mFrame->IsAbsolutelyPositioned(),
"This method should only be called for abspos children");
NS_ERROR(
"Child classes that use css box alignment for abspos children "
"should provide their own implementation of this method!");
// In the unexpected/unlikely event that this implementation gets invoked,
// just use "start" alignment.
return NS_STYLE_ALIGN_START;
}
nsOverflowContinuationTracker::nsOverflowContinuationTracker(
nsContainerFrame* aFrame, bool aWalkOOFFrames,
bool aSkipOverflowContainerChildren)
: mOverflowContList(nullptr),
mPrevOverflowCont(nullptr),
mSentry(nullptr),
mParent(aFrame),
mSkipOverflowContainerChildren(aSkipOverflowContainerChildren),
mWalkOOFFrames(aWalkOOFFrames) {
MOZ_ASSERT(aFrame, "null frame pointer");
SetupOverflowContList();
}
void nsOverflowContinuationTracker::SetupOverflowContList() {
MOZ_ASSERT(mParent, "null frame pointer");
MOZ_ASSERT(!mOverflowContList, "already have list");
nsContainerFrame* nif =
static_cast<nsContainerFrame*>(mParent->GetNextInFlow());
if (nif) {
mOverflowContList =
nif->GetPropTableFrames(nsContainerFrame::OverflowContainersProperty());
if (mOverflowContList) {
mParent = nif;
SetUpListWalker();
}
}
if (!mOverflowContList) {
mOverflowContList = mParent->GetPropTableFrames(
nsContainerFrame::ExcessOverflowContainersProperty());
if (mOverflowContList) {
SetUpListWalker();
}
}
}
/**
* Helper function to walk past overflow continuations whose prev-in-flow
* isn't a normal child and to set mSentry and mPrevOverflowCont correctly.
*/
void nsOverflowContinuationTracker::SetUpListWalker() {
NS_ASSERTION(!mSentry && !mPrevOverflowCont,
"forgot to reset mSentry or mPrevOverflowCont");
if (mOverflowContList) {
nsIFrame* cur = mOverflowContList->FirstChild();
if (mSkipOverflowContainerChildren) {
while (cur && (cur->GetPrevInFlow()->GetStateBits() &
NS_FRAME_IS_OVERFLOW_CONTAINER)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW) ==
mWalkOOFFrames)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
}
if (cur) {
mSentry = cur->GetPrevInFlow();
}
}
}
/**
* Helper function to step forward through the overflow continuations list.
* Sets mSentry and mPrevOverflowCont, skipping over OOF or non-OOF frames
* as appropriate. May only be called when we have already set up an
* mOverflowContList; mOverflowContList cannot be null.
*/
void nsOverflowContinuationTracker::StepForward() {
MOZ_ASSERT(mOverflowContList, "null list");
// Step forward
if (mPrevOverflowCont) {
mPrevOverflowCont = mPrevOverflowCont->GetNextSibling();
} else {
mPrevOverflowCont = mOverflowContList->FirstChild();
}
// Skip over oof or non-oof frames as appropriate
if (mSkipOverflowContainerChildren) {
nsIFrame* cur = mPrevOverflowCont->GetNextSibling();
while (cur &&
(!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW) == mWalkOOFFrames)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
}
// Set up the sentry
mSentry = (mPrevOverflowCont->GetNextSibling())
? mPrevOverflowCont->GetNextSibling()->GetPrevInFlow()
: nullptr;
}
nsresult nsOverflowContinuationTracker::Insert(nsIFrame* aOverflowCont,
nsReflowStatus& aReflowStatus) {
MOZ_ASSERT(aOverflowCont, "null frame pointer");
MOZ_ASSERT(!mSkipOverflowContainerChildren ||
mWalkOOFFrames ==
!!(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW),
"shouldn't insert frame that doesn't match walker type");
MOZ_ASSERT(aOverflowCont->GetPrevInFlow(),
"overflow containers must have a prev-in-flow");
nsresult rv = NS_OK;
bool reparented = false;
nsPresContext* presContext = aOverflowCont->PresContext();
bool addToList = !mSentry || aOverflowCont != mSentry->GetNextInFlow();
// If we have a list and aOverflowCont is already in it then don't try to
// add it again.
if (addToList && aOverflowCont->GetParent() == mParent &&
(aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) &&
mOverflowContList && mOverflowContList->ContainsFrame(aOverflowCont)) {
addToList = false;
mPrevOverflowCont = aOverflowCont->GetPrevSibling();
}
if (addToList) {
if (aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
// aOverflowCont is in some other overflow container list,
// steal it first
NS_ASSERTION(!(mOverflowContList &&
mOverflowContList->ContainsFrame(aOverflowCont)),
"overflow containers out of order");
rv = aOverflowCont->GetParent()->StealFrame(aOverflowCont);
NS_ENSURE_SUCCESS(rv, rv);
} else {
aOverflowCont->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
}
if (!mOverflowContList) {
mOverflowContList = new (presContext->PresShell()) nsFrameList();
mParent->SetPropTableFrames(
mOverflowContList,
nsContainerFrame::ExcessOverflowContainersProperty());
SetUpListWalker();
}
if (aOverflowCont->GetParent() != mParent) {
nsContainerFrame::ReparentFrameView(aOverflowCont,
aOverflowCont->GetParent(), mParent);
reparented = true;
}
// If aOverflowCont has a prev/next-in-flow that might be in
// mOverflowContList we need to find it and insert after/before it to
// maintain the order amongst next-in-flows in this list.
nsIFrame* pif = aOverflowCont->GetPrevInFlow();
nsIFrame* nif = aOverflowCont->GetNextInFlow();
if ((pif && pif->GetParent() == mParent && pif != mPrevOverflowCont) ||
(nif && nif->GetParent() == mParent && mPrevOverflowCont)) {
for (nsFrameList::Enumerator e(*mOverflowContList); !e.AtEnd();
e.Next()) {
nsIFrame* f = e.get();
if (f == pif) {
mPrevOverflowCont = pif;
break;
}
if (f == nif) {
mPrevOverflowCont = f->GetPrevSibling();
break;
}
}
}
mOverflowContList->InsertFrame(mParent, mPrevOverflowCont, aOverflowCont);
aReflowStatus.SetNextInFlowNeedsReflow();
}
// If we need to reflow it, mark it dirty
if (aReflowStatus.NextInFlowNeedsReflow())
aOverflowCont->AddStateBits(NS_FRAME_IS_DIRTY);
// It's in our list, just step forward
StepForward();
NS_ASSERTION(
mPrevOverflowCont == aOverflowCont ||
(mSkipOverflowContainerChildren &&
(mPrevOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW) !=
(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW)),
"OverflowContTracker in unexpected state");
if (addToList) {
// Convert all non-overflow-container continuations of aOverflowCont
// into overflow containers and move them to our overflow
// tracker. This preserves the invariant that the next-continuations
// of an overflow container are also overflow containers.
nsIFrame* f = aOverflowCont->GetNextContinuation();
if (f && (!(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) ||
(!reparented && f->GetParent() == mParent) ||
(reparented && f->GetParent() != mParent))) {
if (!(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
rv = f->GetParent()->StealFrame(f);
NS_ENSURE_SUCCESS(rv, rv);
}
Insert(f, aReflowStatus);
}
}
return rv;
}
void nsOverflowContinuationTracker::BeginFinish(nsIFrame* aChild) {
MOZ_ASSERT(aChild, "null ptr");
MOZ_ASSERT(aChild->GetNextInFlow(),
"supposed to call Finish *before* deleting next-in-flow!");
for (nsIFrame* f = aChild; f; f = f->GetNextInFlow()) {
// We'll update these in EndFinish after the next-in-flows are gone.
if (f == mPrevOverflowCont) {
mSentry = nullptr;
mPrevOverflowCont = nullptr;
break;
}
if (f == mSentry) {
mSentry = nullptr;
break;
}
}
}
void nsOverflowContinuationTracker::EndFinish(nsIFrame* aChild) {
if (!mOverflowContList) {
return;
}
// Forget mOverflowContList if it was deleted.
nsFrameList* eoc = mParent->GetProperty(
nsContainerFrame::ExcessOverflowContainersProperty());
if (eoc != mOverflowContList) {
nsFrameList* oc = static_cast<nsFrameList*>(
mParent->GetProperty(nsContainerFrame::OverflowContainersProperty()));
if (oc != mOverflowContList) {
// mOverflowContList was deleted
mPrevOverflowCont = nullptr;
mSentry = nullptr;
mParent = aChild->GetParent();
mOverflowContList = nullptr;
SetupOverflowContList();
return;
}
}
// The list survived, update mSentry if needed.
if (!mSentry) {
if (!mPrevOverflowCont) {
SetUpListWalker();
} else {
mozilla::AutoRestore<nsIFrame*> saved(mPrevOverflowCont);
// step backward to make StepForward() use our current mPrevOverflowCont
mPrevOverflowCont = mPrevOverflowCont->GetPrevSibling();
StepForward();
}
}
}
/////////////////////////////////////////////////////////////////////////////
// Debugging
#ifdef DEBUG_FRAME_DUMP
void nsContainerFrame::List(FILE* out, const char* aPrefix,
uint32_t aFlags) const {
nsCString str;
ListGeneric(str, aPrefix, aFlags);
// Output the children
bool outputOneList = false;
ChildListIterator lists(this);
for (; !lists.IsDone(); lists.Next()) {
if (outputOneList) {
str += aPrefix;
}
if (lists.CurrentID() != kPrincipalList) {
if (!outputOneList) {
str += "\n";
str += aPrefix;
}
str += nsPrintfCString("%s %p ",
mozilla::layout::ChildListName(lists.CurrentID()),
&GetChildList(lists.CurrentID()));
}
fprintf_stderr(out, "%s<\n", str.get());
str = "";
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* kid = childFrames.get();
// Verify the child frame's parent frame pointer is correct
NS_ASSERTION(kid->GetParent() == this, "bad parent frame pointer");
// Have the child frame list
nsCString pfx(aPrefix);
pfx += " ";
kid->List(out, pfx.get(), aFlags);
}
fprintf_stderr(out, "%s>\n", aPrefix);
outputOneList = true;
}
if (!outputOneList) {
fprintf_stderr(out, "%s<>\n", str.get());
}
}
#endif
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