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gecko-dev/layout/generic/nsSubDocumentFrame.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/. */
/*
* rendering object for replaced elements that contain a document, such
* as <frame>, <iframe>, and some <object>s
*/
#include "nsSubDocumentFrame.h"
#include "gfxPrefs.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/HTMLFrameElement.h"
#include "mozilla/layout/RenderFrame.h"
#include "nsCOMPtr.h"
#include "nsGenericHTMLElement.h"
#include "nsGenericHTMLFrameElement.h"
#include "nsAttrValueInlines.h"
#include "nsIDocShell.h"
#include "nsIContentViewer.h"
#include "nsIContentInlines.h"
#include "nsPresContext.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsFrameSetFrame.h"
#include "nsIScrollable.h"
#include "nsNameSpaceManager.h"
#include "nsDisplayList.h"
#include "nsIScrollableFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsLayoutUtils.h"
#include "FrameLayerBuilder.h"
#include "nsPluginFrame.h"
#include "nsContentUtils.h"
#include "nsIPermissionManager.h"
#include "nsServiceManagerUtils.h"
#include "nsQueryObject.h"
#include "RetainedDisplayListBuilder.h"
using namespace mozilla;
using mozilla::dom::Document;
using mozilla::layout::RenderFrame;
static bool sShowPreviousPage = true;
static Document* GetDocumentFromView(nsView* aView) {
MOZ_ASSERT(aView, "null view");
nsViewManager* vm = aView->GetViewManager();
nsIPresShell* ps = vm ? vm->GetPresShell() : nullptr;
return ps ? ps->GetDocument() : nullptr;
}
nsSubDocumentFrame::nsSubDocumentFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsAtomicContainerFrame(aStyle, aPresContext, kClassID),
mOuterView(nullptr),
mInnerView(nullptr),
mIsInline(false),
mPostedReflowCallback(false),
mDidCreateDoc(false),
mCallingShow(false) {}
#ifdef ACCESSIBILITY
a11y::AccType nsSubDocumentFrame::AccessibleType() {
return a11y::eOuterDocType;
}
#endif
NS_QUERYFRAME_HEAD(nsSubDocumentFrame)
NS_QUERYFRAME_ENTRY(nsSubDocumentFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsAtomicContainerFrame)
class AsyncFrameInit : public Runnable {
public:
explicit AsyncFrameInit(nsIFrame* aFrame)
: mozilla::Runnable("AsyncFrameInit"), mFrame(aFrame) {}
NS_IMETHOD Run() override {
AUTO_PROFILER_LABEL("AsyncFrameInit::Run", OTHER);
if (mFrame.IsAlive()) {
static_cast<nsSubDocumentFrame*>(mFrame.GetFrame())->ShowViewer();
}
return NS_OK;
}
private:
WeakFrame mFrame;
};
static void InsertViewsInReverseOrder(nsView* aSibling, nsView* aParent);
static void EndSwapDocShellsForViews(nsView* aView);
void nsSubDocumentFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(aContent);
// determine if we are a <frame> or <iframe>
mIsInline = !aContent->IsHTMLElement(nsGkAtoms::frame);
static bool addedShowPreviousPage = false;
if (!addedShowPreviousPage) {
// If layout.show_previous_page is true then during loading of a new page we
// will draw the previous page if the new page has painting suppressed.
Preferences::AddBoolVarCache(&sShowPreviousPage,
"layout.show_previous_page", true);
addedShowPreviousPage = true;
}
nsAtomicContainerFrame::Init(aContent, aParent, aPrevInFlow);
// CreateView() creates this frame's view, stored in mOuterView. It needs to
// be created first since it's the parent of the inner view, stored in
// mInnerView.
CreateView();
EnsureInnerView();
// Set the primary frame now so that nsDocumentViewer::FindContainerView
// called from within EndSwapDocShellsForViews below can find it if needed.
aContent->SetPrimaryFrame(this);
// If we have a detached subdoc's root view on our frame loader, re-insert
// it into the view tree. This happens when we've been reframed, and
// ensures the presentation persists across reframes. If the frame element
// has changed documents however, we blow away the presentation.
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) {
nsCOMPtr<Document> oldContainerDoc;
nsIFrame* detachedFrame =
frameloader->GetDetachedSubdocFrame(getter_AddRefs(oldContainerDoc));
frameloader->SetDetachedSubdocFrame(nullptr, nullptr);
MOZ_ASSERT(oldContainerDoc || !detachedFrame);
if (oldContainerDoc) {
nsView* detachedView = detachedFrame ? detachedFrame->GetView() : nullptr;
if (detachedView && oldContainerDoc == aContent->OwnerDoc()) {
// Restore stashed presentation.
::InsertViewsInReverseOrder(detachedView, mInnerView);
::EndSwapDocShellsForViews(mInnerView->GetFirstChild());
} else {
// Presentation is for a different document, don't restore it.
frameloader->Hide();
}
}
}
nsContentUtils::AddScriptRunner(new AsyncFrameInit(this));
}
void nsSubDocumentFrame::ShowViewer() {
if (mCallingShow) {
return;
}
if (!PresContext()->IsDynamic()) {
// We let the printing code take care of loading the document; just
// create the inner view for it to use.
(void)EnsureInnerView();
} else {
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) {
CSSIntSize margin = GetMarginAttributes();
AutoWeakFrame weakThis(this);
mCallingShow = true;
const nsAttrValue* attrValue =
GetContent()->AsElement()->GetParsedAttr(nsGkAtoms::scrolling);
int32_t scrolling =
nsGenericHTMLFrameElement::MapScrollingAttribute(attrValue);
bool didCreateDoc = frameloader->Show(margin.width, margin.height,
scrolling, scrolling, this);
if (!weakThis.IsAlive()) {
return;
}
mCallingShow = false;
mDidCreateDoc = didCreateDoc;
}
}
}
nsIFrame* nsSubDocumentFrame::GetSubdocumentRootFrame() {
if (!mInnerView) return nullptr;
nsView* subdocView = mInnerView->GetFirstChild();
return subdocView ? subdocView->GetFrame() : nullptr;
}
nsIPresShell* nsSubDocumentFrame::GetSubdocumentPresShellForPainting(
uint32_t aFlags) {
if (!mInnerView) return nullptr;
nsView* subdocView = mInnerView->GetFirstChild();
if (!subdocView) return nullptr;
nsIPresShell* presShell = nullptr;
nsIFrame* subdocRootFrame = subdocView->GetFrame();
if (subdocRootFrame) {
presShell = subdocRootFrame->PresShell();
}
// If painting is suppressed in the presshell, we try to look for a better
// presshell to use.
if (!presShell || (presShell->IsPaintingSuppressed() &&
!(aFlags & IGNORE_PAINT_SUPPRESSION))) {
// During page transition mInnerView will sometimes have two children, the
// first being the new page that may not have any frame, and the second
// being the old page that will probably have a frame.
nsView* nextView = subdocView->GetNextSibling();
nsIFrame* frame = nullptr;
if (nextView) {
frame = nextView->GetFrame();
}
if (frame) {
nsIPresShell* ps = frame->PresShell();
if (!presShell ||
(ps && !ps->IsPaintingSuppressed() && sShowPreviousPage)) {
subdocView = nextView;
subdocRootFrame = frame;
presShell = ps;
}
}
if (!presShell) {
// If we don't have a frame we use this roundabout way to get the pres
// shell.
if (!mFrameLoader) return nullptr;
nsIDocShell* docShell = mFrameLoader->GetDocShell(IgnoreErrors());
if (!docShell) return nullptr;
presShell = docShell->GetPresShell();
}
}
return presShell;
}
ScreenIntSize nsSubDocumentFrame::GetSubdocumentSize() {
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) {
nsCOMPtr<Document> oldContainerDoc;
nsIFrame* detachedFrame =
frameloader->GetDetachedSubdocFrame(getter_AddRefs(oldContainerDoc));
nsView* view = detachedFrame ? detachedFrame->GetView() : nullptr;
if (view) {
nsSize size = view->GetBounds().Size();
nsPresContext* presContext = detachedFrame->PresContext();
return ScreenIntSize(presContext->AppUnitsToDevPixels(size.width),
presContext->AppUnitsToDevPixels(size.height));
}
}
// Pick some default size for now. Using 10x10 because that's what the
// code used to do.
return ScreenIntSize(10, 10);
} else {
nsSize docSizeAppUnits;
nsPresContext* presContext = PresContext();
if (GetContent()->IsHTMLElement(nsGkAtoms::frame)) {
docSizeAppUnits = GetSize();
} else {
docSizeAppUnits = GetContentRect().Size();
}
// Adjust subdocument size, according to 'object-fit' and the
// subdocument's intrinsic size and ratio.
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
nsRect destRect = nsLayoutUtils::ComputeObjectDestRect(
nsRect(nsPoint(), docSizeAppUnits), subDocRoot->GetIntrinsicSize(),
subDocRoot->GetIntrinsicRatio(), StylePosition());
docSizeAppUnits = destRect.Size();
}
return ScreenIntSize(
presContext->AppUnitsToDevPixels(docSizeAppUnits.width),
presContext->AppUnitsToDevPixels(docSizeAppUnits.height));
}
}
static void WrapBackgroundColorInOwnLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList) {
nsDisplayList tempItems;
nsDisplayItem* item;
while ((item = aList->RemoveBottom()) != nullptr) {
if (item->GetType() == DisplayItemType::TYPE_BACKGROUND_COLOR) {
nsDisplayList tmpList;
tmpList.AppendToTop(item);
item = MakeDisplayItem<nsDisplayOwnLayer>(
aBuilder, aFrame, &tmpList, aBuilder->CurrentActiveScrolledRoot());
}
tempItems.AppendToTop(item);
}
aList->AppendToTop(&tempItems);
}
void nsSubDocumentFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!IsVisibleForPainting()) return;
nsFrameLoader* frameLoader = FrameLoader();
bool isRemoteFrame = frameLoader && frameLoader->IsRemoteFrame();
// If we are pointer-events:none then we don't need to HitTest background
bool pointerEventsNone =
StyleUI()->mPointerEvents == NS_STYLE_POINTER_EVENTS_NONE;
if (!aBuilder->IsForEventDelivery() || !pointerEventsNone) {
nsDisplayListCollection decorations(aBuilder);
DisplayBorderBackgroundOutline(aBuilder, decorations);
if (isRemoteFrame) {
// Wrap background colors of <iframe>s with remote subdocuments in their
// own layer so we generate a ColorLayer. This is helpful for optimizing
// compositing; we can skip compositing the ColorLayer when the
// remote content is opaque.
WrapBackgroundColorInOwnLayer(aBuilder, this,
decorations.BorderBackground());
}
decorations.MoveTo(aLists);
}
if (aBuilder->IsForEventDelivery() && pointerEventsNone) {
return;
}
// If we're passing pointer events to children then we have to descend into
// subdocuments no matter what, to determine which parts are transparent for
// hit-testing or event regions.
bool needToDescend = aBuilder->GetDescendIntoSubdocuments();
if (!mInnerView || !needToDescend) {
return;
}
if (isRemoteFrame) {
// We're the subdoc for <browser remote="true"> and it has
// painted content. Display its shadow layer tree.
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
nsPoint offset = aBuilder->ToReferenceFrame(this);
nsRect bounds = this->EnsureInnerView()->GetBounds() + offset;
clipState.ClipContentDescendants(bounds);
aLists.Content()->AppendToTop(
MakeDisplayItem<nsDisplayRemote>(aBuilder, this));
return;
}
nsCOMPtr<nsIPresShell> presShell = GetSubdocumentPresShellForPainting(
aBuilder->IsIgnoringPaintSuppression() ? IGNORE_PAINT_SUPPRESSION : 0);
if (!presShell) {
return;
}
if (aBuilder->IsInFilter()) {
Document* outerDoc = PresShell()->GetDocument();
Document* innerDoc = presShell->GetDocument();
if (outerDoc && innerDoc) {
if (!outerDoc->NodePrincipal()->Equals(innerDoc->NodePrincipal())) {
outerDoc->SetDocumentAndPageUseCounter(
eUseCounter_custom_FilteredCrossOriginIFrame);
}
}
}
nsIFrame* subdocRootFrame = presShell->GetRootFrame();
nsPresContext* presContext = presShell->GetPresContext();
int32_t parentAPD = PresContext()->AppUnitsPerDevPixel();
int32_t subdocAPD = presContext->AppUnitsPerDevPixel();
nsRect visible;
nsRect dirty;
bool haveDisplayPort = false;
bool ignoreViewportScrolling = false;
nsIFrame* savedIgnoreScrollFrame = nullptr;
if (subdocRootFrame) {
// get the dirty rect relative to the root frame of the subdoc
visible = aBuilder->GetVisibleRect() + GetOffsetToCrossDoc(subdocRootFrame);
dirty = aBuilder->GetDirtyRect() + GetOffsetToCrossDoc(subdocRootFrame);
// and convert into the appunits of the subdoc
visible = visible.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
dirty = dirty.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
if (nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame()) {
nsIScrollableFrame* rootScrollableFrame =
presShell->GetRootScrollFrameAsScrollable();
MOZ_ASSERT(rootScrollableFrame);
// Use a copy, so the rects don't get modified.
nsRect copyOfDirty = dirty;
nsRect copyOfVisible = visible;
haveDisplayPort = rootScrollableFrame->DecideScrollableLayer(
aBuilder, &copyOfVisible, &copyOfDirty,
/* aSetBase = */ true);
if (!gfxPrefs::LayoutUseContainersForRootFrames() ||
!aBuilder->IsPaintingToWindow()) {
haveDisplayPort = false;
}
ignoreViewportScrolling = presShell->IgnoringViewportScrolling();
if (ignoreViewportScrolling) {
savedIgnoreScrollFrame = aBuilder->GetIgnoreScrollFrame();
aBuilder->SetIgnoreScrollFrame(rootScrollFrame);
}
}
aBuilder->EnterPresShell(subdocRootFrame, pointerEventsNone);
aBuilder->IncrementPresShellPaintCount(presShell);
} else {
visible = aBuilder->GetVisibleRect();
dirty = aBuilder->GetDirtyRect();
}
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
clipState.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
bool constructResolutionItem =
subdocRootFrame && (presShell->GetResolution() != 1.0);
bool constructZoomItem = subdocRootFrame && parentAPD != subdocAPD;
bool needsOwnLayer = false;
if (constructResolutionItem || constructZoomItem || haveDisplayPort ||
presContext->IsRootContentDocument() ||
(sf && sf->IsScrollingActive(aBuilder))) {
needsOwnLayer = true;
}
if (aBuilder->IsRetainingDisplayList()) {
// Caret frame changed, rebuild the entire subdoc.
// We could just invalidate the old and new frame
// areas and save some work here. RetainedDisplayListBuilder
// does this, so we could teach it to find and check all
// subdocs in advance.
if (mPreviousCaret != aBuilder->GetCaretFrame()) {
dirty = visible;
aBuilder->RebuildAllItemsInCurrentSubtree();
// Mark the old caret frame as invalid so that we remove the
// old nsDisplayCaret. We don't mark the current frame as invalid
// since we want the nsDisplaySubdocument to retain it's place
// in the retained display list.
if (mPreviousCaret) {
aBuilder->MarkFrameModifiedDuringBuilding(mPreviousCaret);
}
if (aBuilder->GetCaretFrame()) {
aBuilder->MarkFrameModifiedDuringBuilding(aBuilder->GetCaretFrame());
}
}
mPreviousCaret = aBuilder->GetCaretFrame();
}
nsDisplayList childItems;
{
DisplayListClipState::AutoSaveRestore nestedClipState(aBuilder);
if (needsOwnLayer) {
// Clear current clip. There's no point in propagating it down, since
// the layer we will construct will be clipped by the current clip.
// In fact for nsDisplayZoom propagating it down would be incorrect since
// nsDisplayZoom changes the meaning of appunits.
nestedClipState.Clear();
}
// Invoke AutoBuildingDisplayList to ensure that the correct dirty rect
// is used to compute the visible rect if AddCanvasBackgroundColorItem
// creates a display item.
nsIFrame* frame = subdocRootFrame ? subdocRootFrame : this;
nsDisplayListBuilder::AutoBuildingDisplayList building(aBuilder, frame,
visible, dirty);
if (subdocRootFrame) {
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
nsDisplayListBuilder::AutoCurrentScrollParentIdSetter idSetter(
aBuilder,
ignoreViewportScrolling && rootScrollFrame &&
rootScrollFrame->GetContent()
? nsLayoutUtils::FindOrCreateIDFor(rootScrollFrame->GetContent())
: aBuilder->GetCurrentScrollParentId());
bool hasDocumentLevelListenersForApzAwareEvents =
gfxPlatform::AsyncPanZoomEnabled() &&
nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(presShell);
aBuilder->SetAncestorHasApzAwareEventHandler(
hasDocumentLevelListenersForApzAwareEvents);
subdocRootFrame->BuildDisplayListForStackingContext(aBuilder,
&childItems);
}
if (!aBuilder->IsForEventDelivery()) {
// If we are going to use a displayzoom below then any items we put under
// it need to have underlying frames from the subdocument. So we need to
// calculate the bounds based on which frame will be the underlying frame
// for the canvas background color item.
nsRect bounds =
GetContentRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
if (subdocRootFrame) {
bounds = bounds.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
}
// If we are in print preview/page layout we want to paint the grey
// background behind the page, not the canvas color. The canvas color gets
// painted on the page itself.
if (nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
presShell->AddPrintPreviewBackgroundItem(*aBuilder, childItems, frame,
bounds);
} else {
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that
// AddCanvasBackgroundColorItem can monkey with the contents if
// necessary.
uint32_t flags =
nsIPresShell::FORCE_DRAW | nsIPresShell::ADD_FOR_SUBDOC;
presShell->AddCanvasBackgroundColorItem(
*aBuilder, childItems, frame, bounds, NS_RGBA(0, 0, 0, 0), flags);
}
}
}
if (subdocRootFrame) {
aBuilder->LeavePresShell(subdocRootFrame, &childItems);
if (ignoreViewportScrolling) {
aBuilder->SetIgnoreScrollFrame(savedIgnoreScrollFrame);
}
}
// Generate a resolution and/or zoom item if needed. If one or both of those
// is created, we don't need to create a separate nsDisplaySubDocument.
nsDisplayOwnLayerFlags flags =
nsDisplayOwnLayerFlags::eGenerateSubdocInvalidations;
// If ignoreViewportScrolling is true then the top most layer we create here
// is going to become the scrollable layer for the root scroll frame, so we
// want to add nsDisplayOwnLayer::GENERATE_SCROLLABLE_LAYER to whatever layer
// becomes the topmost. We do this below.
if (constructZoomItem) {
nsDisplayOwnLayerFlags zoomFlags = flags;
if (ignoreViewportScrolling && !constructResolutionItem) {
zoomFlags |= nsDisplayOwnLayerFlags::eGenerateScrollableLayer;
}
nsDisplayZoom* zoomItem = MakeDisplayItem<nsDisplayZoom>(
aBuilder, subdocRootFrame, this, &childItems, subdocAPD, parentAPD,
zoomFlags);
childItems.AppendToTop(zoomItem);
needsOwnLayer = false;
}
// Wrap the zoom item in the resolution item if we have both because we want
// the resolution scale applied on top of the app units per dev pixel
// conversion.
if (ignoreViewportScrolling) {
flags |= nsDisplayOwnLayerFlags::eGenerateScrollableLayer;
}
if (constructResolutionItem) {
nsDisplayResolution* resolutionItem = MakeDisplayItem<nsDisplayResolution>(
aBuilder, subdocRootFrame, this, &childItems, flags);
childItems.AppendToTop(resolutionItem);
needsOwnLayer = false;
}
// We always want top level content documents to be in their own layer.
nsDisplaySubDocument* layerItem = MakeDisplayItem<nsDisplaySubDocument>(
aBuilder, subdocRootFrame ? subdocRootFrame : this, this, &childItems,
flags);
childItems.AppendToTop(layerItem);
layerItem->SetShouldFlattenAway(!needsOwnLayer);
// If we're using containers for root frames, then the earlier call
// to AddCanvasBackgroundColorItem won't have been able to add an
// unscrolled color item for overscroll. Try again now that we're
// outside the scrolled ContainerLayer.
if (!aBuilder->IsForEventDelivery() &&
gfxPrefs::LayoutUseContainersForRootFrames() &&
!nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
nsRect bounds =
GetContentRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
// Invoke AutoBuildingDisplayList to ensure that the correct dirty rect
// is used to compute the visible rect if AddCanvasBackgroundColorItem
// creates a display item.
nsDisplayListBuilder::AutoBuildingDisplayList building(aBuilder, this,
visible, dirty);
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that AddCanvasBackgroundColorItem
// can monkey with the contents if necessary.
uint32_t flags =
nsIPresShell::FORCE_DRAW | nsIPresShell::APPEND_UNSCROLLED_ONLY;
presShell->AddCanvasBackgroundColorItem(*aBuilder, childItems, this, bounds,
NS_RGBA(0, 0, 0, 0), flags);
}
if (aBuilder->IsForFrameVisibility()) {
// We don't add the childItems to the return list as we're dealing with them
// here.
presShell->RebuildApproximateFrameVisibilityDisplayList(childItems);
childItems.DeleteAll(aBuilder);
} else {
aLists.Content()->AppendToTop(&childItems);
}
}
nscoord nsSubDocumentFrame::GetIntrinsicISize() {
if (!IsInline()) {
return 0; // HTML <frame> has no useful intrinsic isize
}
if (mContent->IsXULElement()) {
return 0; // XUL <iframe> and <browser> have no useful intrinsic isize
}
NS_ASSERTION(ObtainIntrinsicSizeFrame() == nullptr,
"Intrinsic isize should come from the embedded document.");
// We must be an HTML <iframe>. Default to size of 300px x 150px, for IE
// compat (and per CSS2.1 draft).
WritingMode wm = GetWritingMode();
return nsPresContext::CSSPixelsToAppUnits(wm.IsVertical() ? 150 : 300);
}
nscoord nsSubDocumentFrame::GetIntrinsicBSize() {
// <frame> processing does not use this routine, only <iframe>
NS_ASSERTION(IsInline(), "Shouldn't have been called");
if (mContent->IsXULElement()) {
return 0;
}
NS_ASSERTION(ObtainIntrinsicSizeFrame() == nullptr,
"Intrinsic bsize should come from the embedded document.");
// Use size of 300px x 150px, for compatibility with IE, and per CSS2.1 draft.
WritingMode wm = GetWritingMode();
return nsPresContext::CSSPixelsToAppUnits(wm.IsVertical() ? 300 : 150);
}
#ifdef DEBUG_FRAME_DUMP
void nsSubDocumentFrame::List(FILE* out, const char* aPrefix,
uint32_t aFlags) const {
nsCString str;
ListGeneric(str, aPrefix, aFlags);
fprintf_stderr(out, "%s\n", str.get());
if (aFlags & TRAVERSE_SUBDOCUMENT_FRAMES) {
nsSubDocumentFrame* f = const_cast<nsSubDocumentFrame*>(this);
nsIFrame* subdocRootFrame = f->GetSubdocumentRootFrame();
if (subdocRootFrame) {
nsCString pfx(aPrefix);
pfx += " ";
subdocRootFrame->List(out, pfx.get(), aFlags);
}
}
}
nsresult nsSubDocumentFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(NS_LITERAL_STRING("FrameOuter"), aResult);
}
#endif
/* virtual */
nscoord nsSubDocumentFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_MIN_INLINE_SIZE(this, result);
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
result = subDocRoot->GetMinISize(aRenderingContext);
} else {
result = GetIntrinsicISize();
}
return result;
}
/* virtual */
nscoord nsSubDocumentFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_PREF_INLINE_SIZE(this, result);
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
result = subDocRoot->GetPrefISize(aRenderingContext);
} else {
result = GetIntrinsicISize();
}
return result;
}
/* virtual */
IntrinsicSize nsSubDocumentFrame::GetIntrinsicSize() {
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
return subDocRoot->GetIntrinsicSize();
}
return nsAtomicContainerFrame::GetIntrinsicSize();
}
/* virtual */
nsSize nsSubDocumentFrame::GetIntrinsicRatio() {
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
return subDocRoot->GetIntrinsicRatio();
}
return nsAtomicContainerFrame::GetIntrinsicRatio();
}
/* virtual */
LogicalSize nsSubDocumentFrame::ComputeAutoSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorder, const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
if (!IsInline()) {
return nsFrame::ComputeAutoSize(aRenderingContext, aWM, aCBSize,
aAvailableISize, aMargin, aBorder, aPadding,
aFlags);
}
const WritingMode wm = GetWritingMode();
LogicalSize result(wm, GetIntrinsicISize(), GetIntrinsicBSize());
return result.ConvertTo(aWM, wm);
}
/* virtual */
LogicalSize nsSubDocumentFrame::ComputeSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorder, const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
if (subDocRoot) {
return ComputeSizeWithIntrinsicDimensions(
aRenderingContext, aWM, subDocRoot->GetIntrinsicSize(),
subDocRoot->GetIntrinsicRatio(), aCBSize, aMargin, aBorder, aPadding,
aFlags);
}
return nsAtomicContainerFrame::ComputeSize(aRenderingContext, aWM, aCBSize,
aAvailableISize, aMargin, aBorder,
aPadding, aFlags);
}
void nsSubDocumentFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsSubDocumentFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_FRAME_TRACE(
NS_FRAME_TRACE_CALLS,
("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d",
aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
NS_ASSERTION(aReflowInput.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
"Shouldn't have unconstrained stuff here "
"thanks to the rules of reflow");
NS_ASSERTION(NS_INTRINSICSIZE != aReflowInput.ComputedHeight(),
"Shouldn't have unconstrained stuff here "
"thanks to ComputeAutoSize");
NS_ASSERTION(mContent->GetPrimaryFrame() == this, "Shouldn't happen");
// XUL <iframe> or <browser>, or HTML <iframe>, <object> or <embed>
aDesiredSize.SetSize(aReflowInput.GetWritingMode(),
aReflowInput.ComputedSizeWithBorderPadding());
// "offset" is the offset of our content area from our frame's
// top-left corner.
nsPoint offset = nsPoint(aReflowInput.ComputedPhysicalBorderPadding().left,
aReflowInput.ComputedPhysicalBorderPadding().top);
if (mInnerView) {
const nsMargin& bp = aReflowInput.ComputedPhysicalBorderPadding();
nsSize innerSize(aDesiredSize.Width() - bp.LeftRight(),
aDesiredSize.Height() - bp.TopBottom());
// Size & position the view according to 'object-fit' & 'object-position'.
nsIFrame* subDocRoot = ObtainIntrinsicSizeFrame();
IntrinsicSize intrinsSize;
nsSize intrinsRatio;
if (subDocRoot) {
intrinsSize = subDocRoot->GetIntrinsicSize();
intrinsRatio = subDocRoot->GetIntrinsicRatio();
}
nsRect destRect = nsLayoutUtils::ComputeObjectDestRect(
nsRect(offset, innerSize), intrinsSize, intrinsRatio, StylePosition());
nsViewManager* vm = mInnerView->GetViewManager();
vm->MoveViewTo(mInnerView, destRect.x, destRect.y);
vm->ResizeView(mInnerView, nsRect(nsPoint(0, 0), destRect.Size()), true);
}
aDesiredSize.SetOverflowAreasToDesiredBounds();
FinishAndStoreOverflow(&aDesiredSize);
if (!aPresContext->IsPaginated() && !mPostedReflowCallback) {
PresShell()->PostReflowCallback(this);
mPostedReflowCallback = true;
}
NS_FRAME_TRACE(
NS_FRAME_TRACE_CALLS,
("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s",
aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus).c_str()));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
bool nsSubDocumentFrame::ReflowFinished() {
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) {
AutoWeakFrame weakFrame(this);
frameloader->UpdatePositionAndSize(this);
if (weakFrame.IsAlive()) {
// Make sure that we can post a reflow callback in the future.
mPostedReflowCallback = false;
}
} else {
mPostedReflowCallback = false;
}
return false;
}
void nsSubDocumentFrame::ReflowCallbackCanceled() {
mPostedReflowCallback = false;
}
nsresult nsSubDocumentFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (aNameSpaceID != kNameSpaceID_None) {
return NS_OK;
}
// If the noResize attribute changes, dis/allow frame to be resized
if (aAttribute == nsGkAtoms::noresize) {
// Note that we're not doing content type checks, but that's ok -- if
// they'd fail we will just end up with a null framesetFrame.
if (mContent->GetParent()->IsHTMLElement(nsGkAtoms::frameset)) {
nsIFrame* parentFrame = GetParent();
if (parentFrame) {
// There is no interface for nsHTMLFramesetFrame so QI'ing to
// concrete class, yay!
nsHTMLFramesetFrame* framesetFrame = do_QueryFrame(parentFrame);
if (framesetFrame) {
framesetFrame->RecalculateBorderResize();
}
}
}
} else if (aAttribute == nsGkAtoms::showresizer) {
nsIFrame* rootFrame = GetSubdocumentRootFrame();
if (rootFrame) {
rootFrame->PresShell()->FrameNeedsReflow(rootFrame, nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
}
} else if (aAttribute == nsGkAtoms::marginwidth ||
aAttribute == nsGkAtoms::marginheight) {
// Retrieve the attributes
CSSIntSize margins = GetMarginAttributes();
// Notify the frameloader
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) frameloader->MarginsChanged(margins.width, margins.height);
}
return NS_OK;
}
nsIFrame* NS_NewSubDocumentFrame(nsIPresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell)
nsSubDocumentFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsSubDocumentFrame)
class nsHideViewer : public Runnable {
public:
nsHideViewer(nsIContent* aFrameElement, nsFrameLoader* aFrameLoader,
nsIPresShell* aPresShell, bool aHideViewerIfFrameless)
: mozilla::Runnable("nsHideViewer"),
mFrameElement(aFrameElement),
mFrameLoader(aFrameLoader),
mPresShell(aPresShell),
mHideViewerIfFrameless(aHideViewerIfFrameless) {
NS_ASSERTION(mFrameElement, "Must have a frame element");
NS_ASSERTION(mFrameLoader, "Must have a frame loader");
NS_ASSERTION(mPresShell, "Must have a presshell");
}
NS_IMETHOD Run() override {
// Flush frames, to ensure any pending display:none changes are made.
// Note it can be unsafe to flush if we've destroyed the presentation
// for some other reason, like if we're shutting down.
//
// But avoid the flush if we know for sure we're away, like when we're out
// of the document already.
//
// FIXME(emilio): This could still be a perf footgun when removing lots of
// siblings where each of them cause the reframe of an ancestor which happen
// to contain a subdocument.
//
// We should find some way to avoid that!
if (!mPresShell->IsDestroying() && mFrameElement->IsInComposedDoc()) {
mPresShell->FlushPendingNotifications(FlushType::Frames);
}
// Either the frame has been constructed by now, or it never will be,
// either way we want to clear the stashed views.
mFrameLoader->SetDetachedSubdocFrame(nullptr, nullptr);
nsSubDocumentFrame* frame = do_QueryFrame(mFrameElement->GetPrimaryFrame());
if ((!frame && mHideViewerIfFrameless) || mPresShell->IsDestroying()) {
// Either the frame element has no nsIFrame or the presshell is being
// destroyed. Hide the nsFrameLoader, which destroys the presentation.
mFrameLoader->Hide();
}
return NS_OK;
}
private:
nsCOMPtr<nsIContent> mFrameElement;
RefPtr<nsFrameLoader> mFrameLoader;
nsCOMPtr<nsIPresShell> mPresShell;
bool mHideViewerIfFrameless;
};
static nsView* BeginSwapDocShellsForViews(nsView* aSibling);
void nsSubDocumentFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
if (mPostedReflowCallback) {
PresShell()->CancelReflowCallback(this);
mPostedReflowCallback = false;
}
// Detach the subdocument's views and stash them in the frame loader.
// We can then reattach them if we're being reframed (for example if
// the frame has been made position:fixed).
RefPtr<nsFrameLoader> frameloader = FrameLoader();
if (frameloader) {
nsView* detachedViews =
::BeginSwapDocShellsForViews(mInnerView->GetFirstChild());
if (detachedViews && detachedViews->GetFrame()) {
MOZ_ASSERT(mContent->OwnerDoc());
frameloader->SetDetachedSubdocFrame(detachedViews->GetFrame(),
mContent->OwnerDoc());
// We call nsFrameLoader::HideViewer() in a script runner so that we can
// safely determine whether the frame is being reframed or destroyed.
nsContentUtils::AddScriptRunner(new nsHideViewer(
mContent, frameloader, PresShell(), (mDidCreateDoc || mCallingShow)));
} else {
frameloader->SetDetachedSubdocFrame(nullptr, nullptr);
if (mDidCreateDoc || mCallingShow) {
frameloader->Hide();
}
}
}
nsAtomicContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
CSSIntSize nsSubDocumentFrame::GetMarginAttributes() {
CSSIntSize result(-1, -1);
nsGenericHTMLElement* content = nsGenericHTMLElement::FromNode(mContent);
if (content) {
const nsAttrValue* attr = content->GetParsedAttr(nsGkAtoms::marginwidth);
if (attr && attr->Type() == nsAttrValue::eInteger)
result.width = attr->GetIntegerValue();
attr = content->GetParsedAttr(nsGkAtoms::marginheight);
if (attr && attr->Type() == nsAttrValue::eInteger)
result.height = attr->GetIntegerValue();
}
return result;
}
nsFrameLoader* nsSubDocumentFrame::FrameLoader() const {
nsIContent* content = GetContent();
if (!content) return nullptr;
if (!mFrameLoader) {
RefPtr<nsFrameLoaderOwner> loaderOwner = do_QueryObject(content);
if (loaderOwner) {
mFrameLoader = loaderOwner->GetFrameLoader();
}
}
return mFrameLoader;
}
// XXX this should be called ObtainDocShell or something like that,
// to indicate that it could have side effects
nsIDocShell* nsSubDocumentFrame::GetDocShell() {
// How can FrameLoader() return null???
if (NS_WARN_IF(!FrameLoader())) {
return nullptr;
}
return mFrameLoader->GetDocShell(IgnoreErrors());
}
static void DestroyDisplayItemDataForFrames(nsIFrame* aFrame) {
FrameLayerBuilder::DestroyDisplayItemDataFor(aFrame);
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
DestroyDisplayItemDataForFrames(childFrames.get());
}
}
}
static bool BeginSwapDocShellsForDocument(Document* aDocument, void*) {
MOZ_ASSERT(aDocument, "null document");
PresShell* presShell = aDocument->GetPresShell();
if (presShell) {
// Disable painting while the views are detached, see bug 946929.
presShell->SetNeverPainting(true);
nsIFrame* rootFrame = presShell->GetRootFrame();
if (rootFrame) {
::DestroyDisplayItemDataForFrames(rootFrame);
}
}
aDocument->EnumerateActivityObservers(nsPluginFrame::BeginSwapDocShells,
nullptr);
aDocument->EnumerateSubDocuments(BeginSwapDocShellsForDocument, nullptr);
return true;
}
static nsView* BeginSwapDocShellsForViews(nsView* aSibling) {
// Collect the removed sibling views in reverse order in 'removedViews'.
nsView* removedViews = nullptr;
while (aSibling) {
Document* doc = ::GetDocumentFromView(aSibling);
if (doc) {
::BeginSwapDocShellsForDocument(doc, nullptr);
}
nsView* next = aSibling->GetNextSibling();
aSibling->GetViewManager()->RemoveChild(aSibling);
aSibling->SetNextSibling(removedViews);
removedViews = aSibling;
aSibling = next;
}
return removedViews;
}
static void InsertViewsInReverseOrder(nsView* aSibling, nsView* aParent) {
MOZ_ASSERT(aParent, "null view");
MOZ_ASSERT(!aParent->GetFirstChild(), "inserting into non-empty list");
nsViewManager* vm = aParent->GetViewManager();
while (aSibling) {
nsView* next = aSibling->GetNextSibling();
aSibling->SetNextSibling(nullptr);
// true means 'after' in document order which is 'before' in view order,
// so this call prepends the child, thus reversing the siblings as we go.
vm->InsertChild(aParent, aSibling, nullptr, true);
aSibling = next;
}
}
nsresult nsSubDocumentFrame::BeginSwapDocShells(nsIFrame* aOther) {
if (!aOther || !aOther->IsSubDocumentFrame()) {
return NS_ERROR_NOT_IMPLEMENTED;
}
nsSubDocumentFrame* other = static_cast<nsSubDocumentFrame*>(aOther);
if (!mFrameLoader || !mDidCreateDoc || mCallingShow || !other->mFrameLoader ||
!other->mDidCreateDoc) {
return NS_ERROR_NOT_IMPLEMENTED;
}
ClearDisplayItems();
other->ClearDisplayItems();
if (mInnerView && other->mInnerView) {
nsView* ourSubdocViews = mInnerView->GetFirstChild();
nsView* ourRemovedViews = ::BeginSwapDocShellsForViews(ourSubdocViews);
nsView* otherSubdocViews = other->mInnerView->GetFirstChild();
nsView* otherRemovedViews = ::BeginSwapDocShellsForViews(otherSubdocViews);
::InsertViewsInReverseOrder(ourRemovedViews, other->mInnerView);
::InsertViewsInReverseOrder(otherRemovedViews, mInnerView);
}
mFrameLoader.swap(other->mFrameLoader);
return NS_OK;
}
static bool EndSwapDocShellsForDocument(Document* aDocument, void*) {
MOZ_ASSERT(aDocument, "null document");
// Our docshell and view trees have been updated for the new hierarchy.
// Now also update all nsDeviceContext::mWidget to that of the
// container view in the new hierarchy.
nsCOMPtr<nsIDocShell> ds = aDocument->GetDocShell();
if (ds) {
nsCOMPtr<nsIContentViewer> cv;
ds->GetContentViewer(getter_AddRefs(cv));
while (cv) {
RefPtr<nsPresContext> pc = cv->GetPresContext();
if (pc && pc->GetPresShell()) {
pc->GetPresShell()->SetNeverPainting(ds->IsInvisible());
}
nsDeviceContext* dc = pc ? pc->DeviceContext() : nullptr;
if (dc) {
nsView* v = cv->FindContainerView();
dc->Init(v ? v->GetNearestWidget(nullptr) : nullptr);
}
cv = cv->GetPreviousViewer();
}
}
aDocument->EnumerateActivityObservers(nsPluginFrame::EndSwapDocShells,
nullptr);
aDocument->EnumerateSubDocuments(EndSwapDocShellsForDocument, nullptr);
return true;
}
static void EndSwapDocShellsForViews(nsView* aSibling) {
for (; aSibling; aSibling = aSibling->GetNextSibling()) {
Document* doc = ::GetDocumentFromView(aSibling);
if (doc) {
::EndSwapDocShellsForDocument(doc, nullptr);
}
nsIFrame* frame = aSibling->GetFrame();
if (frame) {
nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(frame);
if (parent->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
nsIFrame::AddInPopupStateBitToDescendants(frame);
} else {
nsIFrame::RemoveInPopupStateBitFromDescendants(frame);
}
if (frame->HasInvalidFrameInSubtree()) {
while (parent &&
!parent->HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT |
NS_FRAME_IS_NONDISPLAY)) {
parent->AddStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT);
parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
}
}
}
}
}
void nsSubDocumentFrame::EndSwapDocShells(nsIFrame* aOther) {
nsSubDocumentFrame* other = static_cast<nsSubDocumentFrame*>(aOther);
AutoWeakFrame weakThis(this);
AutoWeakFrame weakOther(aOther);
if (mInnerView) {
::EndSwapDocShellsForViews(mInnerView->GetFirstChild());
}
if (other->mInnerView) {
::EndSwapDocShellsForViews(other->mInnerView->GetFirstChild());
}
// Now make sure we reflow both frames, in case their contents
// determine their size.
// And repaint them, for good measure, in case there's nothing
// interesting that happens during reflow.
if (weakThis.IsAlive()) {
PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_IS_DIRTY);
InvalidateFrameSubtree();
}
if (weakOther.IsAlive()) {
other->PresShell()->FrameNeedsReflow(other, nsIPresShell::eTreeChange,
NS_FRAME_IS_DIRTY);
other->InvalidateFrameSubtree();
}
}
void nsSubDocumentFrame::ClearDisplayItems() {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
return;
}
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(this);
MOZ_ASSERT(displayRoot);
RetainedDisplayListBuilder* retainedBuilder =
displayRoot->GetProperty(RetainedDisplayListBuilder::Cached());
MOZ_ASSERT(retainedBuilder);
for (nsDisplayItem* i : *items) {
if (i->GetType() == DisplayItemType::TYPE_SUBDOCUMENT) {
i->GetChildren()->DeleteAll(retainedBuilder->Builder());
static_cast<nsDisplaySubDocument*>(i)->Disown();
break;
}
}
}
nsView* nsSubDocumentFrame::EnsureInnerView() {
if (mInnerView) {
return mInnerView;
}
// create, init, set the parent of the view
nsView* outerView = GetView();
NS_ASSERTION(outerView, "Must have an outer view already");
nsRect viewBounds(0, 0, 0, 0); // size will be fixed during reflow
nsViewManager* viewMan = outerView->GetViewManager();
nsView* innerView = viewMan->CreateView(viewBounds, outerView);
if (!innerView) {
NS_ERROR("Could not create inner view");
return nullptr;
}
mInnerView = innerView;
viewMan->InsertChild(outerView, innerView, nullptr, true);
return mInnerView;
}
nsIFrame* nsSubDocumentFrame::ObtainIntrinsicSizeFrame() {
nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(GetContent());
if (olc) {
// We are an HTML <object> or <embed> (a replaced element).
// Try to get an nsIFrame for our sub-document's document element
nsIFrame* subDocRoot = nullptr;
nsIDocShell* docShell = GetDocShell();
if (docShell) {
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (presShell) {
nsIScrollableFrame* scrollable =
presShell->GetRootScrollFrameAsScrollable();
if (scrollable) {
nsIFrame* scrolled = scrollable->GetScrolledFrame();
if (scrolled) {
subDocRoot = scrolled->PrincipalChildList().FirstChild();
}
}
}
}
if (subDocRoot && subDocRoot->GetContent() &&
subDocRoot->GetContent()->NodeInfo()->Equals(nsGkAtoms::svg,
kNameSpaceID_SVG)) {
return subDocRoot; // SVG documents have an intrinsic size
}
}
return nullptr;
}
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