diff options
Diffstat (limited to 'layout/svg/nsSVGUseFrame.cpp')
| -rw-r--r-- | layout/svg/nsSVGUseFrame.cpp | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/layout/svg/nsSVGUseFrame.cpp b/layout/svg/nsSVGUseFrame.cpp new file mode 100644 index 000000000..118d24f69 --- /dev/null +++ b/layout/svg/nsSVGUseFrame.cpp @@ -0,0 +1,259 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ + +// Keep in (case-insensitive) order: +#include "nsIAnonymousContentCreator.h" +#include "nsSVGEffects.h" +#include "nsSVGGFrame.h" +#include "mozilla/dom/SVGUseElement.h" +#include "nsContentList.h" + +using namespace mozilla::dom; + +class nsSVGUseFrame : public nsSVGGFrame + , public nsIAnonymousContentCreator +{ + friend nsIFrame* + NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); + +protected: + explicit nsSVGUseFrame(nsStyleContext* aContext) + : nsSVGGFrame(aContext) + , mHasValidDimensions(true) + {} + +public: + NS_DECL_QUERYFRAME + NS_DECL_FRAMEARENA_HELPERS + + // nsIFrame interface: + virtual void Init(nsIContent* aContent, + nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; + + virtual nsresult AttributeChanged(int32_t aNameSpaceID, + nsIAtom* aAttribute, + int32_t aModType) override; + + virtual void DestroyFrom(nsIFrame* aDestructRoot) override; + + /** + * Get the "type" of the frame + * + * @see nsGkAtoms::svgUseFrame + */ + virtual nsIAtom* GetType() const override; + + virtual bool IsLeaf() const override; + +#ifdef DEBUG_FRAME_DUMP + virtual nsresult GetFrameName(nsAString& aResult) const override + { + return MakeFrameName(NS_LITERAL_STRING("SVGUse"), aResult); + } +#endif + + // nsISVGChildFrame interface: + virtual void ReflowSVG() override; + virtual void NotifySVGChanged(uint32_t aFlags) override; + + // nsIAnonymousContentCreator + virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override; + virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, + uint32_t aFilter) override; + +private: + bool mHasValidDimensions; +}; + +//---------------------------------------------------------------------- +// Implementation + +nsIFrame* +NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) +{ + return new (aPresShell) nsSVGUseFrame(aContext); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsSVGUseFrame) + +nsIAtom * +nsSVGUseFrame::GetType() const +{ + return nsGkAtoms::svgUseFrame; +} + +//---------------------------------------------------------------------- +// nsQueryFrame methods + +NS_QUERYFRAME_HEAD(nsSVGUseFrame) + NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator) +NS_QUERYFRAME_TAIL_INHERITING(nsSVGGFrame) + +//---------------------------------------------------------------------- +// nsIFrame methods: + +void +nsSVGUseFrame::Init(nsIContent* aContent, + nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) +{ + NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::use), + "Content is not an SVG use!"); + + mHasValidDimensions = + static_cast<SVGUseElement*>(aContent)->HasValidDimensions(); + + nsSVGGFrame::Init(aContent, aParent, aPrevInFlow); +} + +nsresult +nsSVGUseFrame::AttributeChanged(int32_t aNameSpaceID, + nsIAtom* aAttribute, + int32_t aModType) +{ + SVGUseElement *useElement = static_cast<SVGUseElement*>(mContent); + + if (aNameSpaceID == kNameSpaceID_None) { + if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) { + // make sure our cached transform matrix gets (lazily) updated + mCanvasTM = nullptr; + nsLayoutUtils::PostRestyleEvent( + useElement, nsRestyleHint(0), + nsChangeHint_InvalidateRenderingObservers); + nsSVGUtils::ScheduleReflowSVG(this); + nsSVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED); + } else if (aAttribute == nsGkAtoms::width || + aAttribute == nsGkAtoms::height) { + bool invalidate = false; + if (mHasValidDimensions != useElement->HasValidDimensions()) { + mHasValidDimensions = !mHasValidDimensions; + invalidate = true; + } + if (useElement->OurWidthAndHeightAreUsed()) { + invalidate = true; + useElement->SyncWidthOrHeight(aAttribute); + } + if (invalidate) { + nsLayoutUtils::PostRestyleEvent( + useElement, nsRestyleHint(0), + nsChangeHint_InvalidateRenderingObservers); + nsSVGUtils::ScheduleReflowSVG(this); + } + } + } + + if ((aNameSpaceID == kNameSpaceID_XLink || + aNameSpaceID == kNameSpaceID_None) && + aAttribute == nsGkAtoms::href) { + // we're changing our nature, clear out the clone information + nsLayoutUtils::PostRestyleEvent( + useElement, nsRestyleHint(0), + nsChangeHint_InvalidateRenderingObservers); + nsSVGUtils::ScheduleReflowSVG(this); + useElement->mOriginal = nullptr; + useElement->UnlinkSource(); + useElement->TriggerReclone(); + } + + return nsSVGGFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); +} + +void +nsSVGUseFrame::DestroyFrom(nsIFrame* aDestructRoot) +{ + RefPtr<SVGUseElement> use = static_cast<SVGUseElement*>(mContent); + nsSVGGFrame::DestroyFrom(aDestructRoot); + use->DestroyAnonymousContent(); +} + +bool +nsSVGUseFrame::IsLeaf() const +{ + return true; +} + + +//---------------------------------------------------------------------- +// nsISVGChildFrame methods + +void +nsSVGUseFrame::ReflowSVG() +{ + // We only handle x/y offset here, since any width/height that is in force is + // handled by the nsSVGOuterSVGFrame for the anonymous <svg> that will be + // created for that purpose. + float x, y; + static_cast<SVGUseElement*>(mContent)-> + GetAnimatedLengthValues(&x, &y, nullptr); + mRect.MoveTo(nsLayoutUtils::RoundGfxRectToAppRect( + gfxRect(x, y, 0.0, 0.0), + PresContext()->AppUnitsPerCSSPixel()).TopLeft()); + + // If we have a filter, we need to invalidate ourselves because filter + // output can change even if none of our descendants need repainting. + if (StyleEffects()->HasFilters()) { + InvalidateFrame(); + } + + nsSVGGFrame::ReflowSVG(); +} + +void +nsSVGUseFrame::NotifySVGChanged(uint32_t aFlags) +{ + if (aFlags & COORD_CONTEXT_CHANGED && + !(aFlags & TRANSFORM_CHANGED)) { + // Coordinate context changes affect mCanvasTM if we have a + // percentage 'x' or 'y' + SVGUseElement *use = static_cast<SVGUseElement*>(mContent); + if (use->mLengthAttributes[SVGUseElement::ATTR_X].IsPercentage() || + use->mLengthAttributes[SVGUseElement::ATTR_Y].IsPercentage()) { + aFlags |= TRANSFORM_CHANGED; + // Ancestor changes can't affect how we render from the perspective of + // any rendering observers that we may have, so we don't need to + // invalidate them. We also don't need to invalidate ourself, since our + // changed ancestor will have invalidated its entire area, which includes + // our area. + // For perf reasons we call this before calling NotifySVGChanged() below. + nsSVGUtils::ScheduleReflowSVG(this); + } + } + + // We don't remove the TRANSFORM_CHANGED flag here if we have a viewBox or + // non-percentage width/height, since if they're set then they are cloned to + // an anonymous child <svg>, and its nsSVGInnerSVGFrame will do that. + + nsSVGGFrame::NotifySVGChanged(aFlags); +} + +//---------------------------------------------------------------------- +// nsIAnonymousContentCreator methods: + +nsresult +nsSVGUseFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements) +{ + SVGUseElement *use = static_cast<SVGUseElement*>(mContent); + + nsIContent* clone = use->CreateAnonymousContent(); + nsLayoutUtils::PostRestyleEvent( + use, nsRestyleHint(0), nsChangeHint_InvalidateRenderingObservers); + if (!clone) + return NS_ERROR_FAILURE; + if (!aElements.AppendElement(clone)) + return NS_ERROR_OUT_OF_MEMORY; + return NS_OK; +} + +void +nsSVGUseFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, + uint32_t aFilter) +{ + SVGUseElement *use = static_cast<SVGUseElement*>(mContent); + nsIContent* clone = use->GetAnonymousContent(); + if (clone) { + aElements.AppendElement(clone); + } +} |