gecko-dev/dom/svg/SVGSVGElement.h

492 lines
17 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_SVGSVGElement_h
#define mozilla_dom_SVGSVGElement_h
#include "mozilla/dom/FromParser.h"
#include "nsAutoPtr.h"
#include "nsIContentInlines.h"
#include "nsISVGPoint.h"
#include "nsSVGEnum.h"
#include "nsSVGLength2.h"
#include "SVGGraphicsElement.h"
#include "SVGImageContext.h"
#include "nsSVGViewBox.h"
#include "SVGPreserveAspectRatio.h"
#include "SVGAnimatedPreserveAspectRatio.h"
#include "mozilla/Attributes.h"
nsresult NS_NewSVGSVGElement(nsIContent **aResult,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
mozilla::dom::FromParser aFromParser);
class nsSMILTimeContainer;
class nsSVGOuterSVGFrame;
class nsSVGInnerSVGFrame;
namespace mozilla {
class AutoPreserveAspectRatioOverride;
class AutoSVGTimeSetRestore;
class DOMSVGAnimatedPreserveAspectRatio;
class DOMSVGLength;
class DOMSVGNumber;
class EventChainPreVisitor;
class SVGFragmentIdentifier;
class AutoSVGViewHandler;
namespace dom {
class SVGAngle;
class SVGAnimatedRect;
class SVGMatrix;
class SVGTransform;
class SVGViewElement;
class SVGIRect;
class SVGSVGElement;
class DOMSVGTranslatePoint final : public nsISVGPoint {
public:
DOMSVGTranslatePoint(SVGPoint* aPt, SVGSVGElement *aElement)
: nsISVGPoint(aPt, true), mElement(aElement) {}
explicit DOMSVGTranslatePoint(DOMSVGTranslatePoint* aPt)
: nsISVGPoint(&aPt->mPt, true), mElement(aPt->mElement) {}
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DOMSVGTranslatePoint, nsISVGPoint)
virtual DOMSVGPoint* Copy() override;
// WebIDL
virtual float X() override { return mPt.GetX(); }
virtual float Y() override { return mPt.GetY(); }
virtual void SetX(float aValue, ErrorResult& rv) override;
virtual void SetY(float aValue, ErrorResult& rv) override;
virtual already_AddRefed<nsISVGPoint> MatrixTransform(SVGMatrix& matrix) override;
virtual nsISupports* GetParentObject() override;
RefPtr<SVGSVGElement> mElement;
private:
~DOMSVGTranslatePoint() {}
};
class svgFloatSize {
public:
svgFloatSize(float aWidth, float aHeight)
: width(aWidth)
, height(aHeight)
{}
bool operator!=(const svgFloatSize& rhs) {
return width != rhs.width || height != rhs.height;
}
float width;
float height;
};
// Stores svgView arguments of SVG fragment identifiers.
class SVGView {
friend class mozilla::AutoSVGViewHandler;
friend class mozilla::dom::SVGSVGElement;
public:
SVGView();
private:
nsSVGEnum mZoomAndPan;
nsSVGViewBox mViewBox;
SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
nsAutoPtr<nsSVGAnimatedTransformList> mTransforms;
};
typedef SVGGraphicsElement SVGSVGElementBase;
class SVGSVGElement final : public SVGSVGElementBase
{
friend class ::nsSVGOuterSVGFrame;
friend class ::nsSVGInnerSVGFrame;
friend class mozilla::AutoPreserveAspectRatioOverride;
friend class mozilla::AutoSVGTimeSetRestore;
friend class mozilla::dom::SVGView;
friend class mozilla::SVGFragmentIdentifier;
friend class mozilla::AutoSVGViewHandler;
SVGSVGElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo,
FromParser aFromParser);
virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
friend nsresult (::NS_NewSVGSVGElement(nsIContent **aResult,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
mozilla::dom::FromParser aFromParser));
~SVGSVGElement();
public:
// interfaces:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGSVGElement, SVGSVGElementBase)
/**
* For use by zoom controls to allow currentScale, currentTranslate.x and
* currentTranslate.y to be set by a single operation that dispatches a
* single SVGZoom event (instead of one SVGZoom and two SVGScroll events).
*
* XXX SVGZoomEvent is no more, is this needed?
*/
void SetCurrentScaleTranslate(float s, float x, float y);
/**
* Retrieve the value of currentScale and currentTranslate.
*/
const SVGPoint& GetCurrentTranslate() { return mCurrentTranslate; }
float GetCurrentScale() { return mCurrentScale; }
/**
* Retrieve the value of currentScale, currentTranslate.x or
* currentTranslate.y prior to the last change made to any one of them.
*/
const SVGPoint& GetPreviousTranslate() { return mPreviousTranslate; }
float GetPreviousScale() { return mPreviousScale; }
nsSMILTimeContainer* GetTimedDocumentRoot();
// nsIContent interface
NS_IMETHOD_(bool) IsAttributeMapped(const nsIAtom* aAttribute) const override;
virtual nsresult GetEventTargetParent(
EventChainPreVisitor& aVisitor) override;
virtual bool IsEventAttributeName(nsIAtom* aName) override;
// nsSVGElement specializations:
virtual gfxMatrix PrependLocalTransformsTo(
const gfxMatrix &aMatrix,
SVGTransformTypes aWhich = eAllTransforms) const override;
virtual nsSVGAnimatedTransformList*
GetAnimatedTransformList(uint32_t aFlags = 0) override;
virtual bool HasValidDimensions() const override;
// SVGSVGElement methods:
float GetLength(uint8_t mCtxType);
// public helpers:
/**
* Returns -1 if the width/height is a percentage, else returns the user unit
* length clamped to fit in a int32_t.
* XXX see bug 1112533 comment 3 - we should fix drawImage so that we can
* change these methods to make zero the error flag for percentages.
*/
int32_t GetIntrinsicWidth();
int32_t GetIntrinsicHeight();
/**
* Returns true if this element has a base/anim value for its "viewBox"
* attribute that defines a viewBox rectangle with finite values, or
* if there is a view element overriding this element's viewBox and it
* has a valid viewBox.
*
* Note that this does not check whether we need to synthesize a viewBox,
* so you must call ShouldSynthesizeViewBox() if you need to check that too.
*
* Note also that this method does not pay attention to whether the width or
* height values of the viewBox rect are positive!
*/
bool HasViewBoxRect() const;
/**
* Returns true if we should synthesize a viewBox for ourselves (that is, if
* we're the root element in an image document, and we're not currently being
* painted for an <svg:image> element).
*
* Only call this method if HasViewBoxRect() returns false.
*/
bool ShouldSynthesizeViewBox() const;
bool HasViewBoxOrSyntheticViewBox() const {
return HasViewBoxRect() || ShouldSynthesizeViewBox();
}
gfx::Matrix GetViewBoxTransform() const;
bool HasChildrenOnlyTransform() const {
return mHasChildrenOnlyTransform;
}
void UpdateHasChildrenOnlyTransform();
enum ChildrenOnlyTransformChangedFlags {
eDuringReflow = 1
};
/**
* This method notifies the style system that the overflow rects of our
* immediate childrens' frames need to be updated. It is called by our own
* frame when changes (e.g. to currentScale) cause our children-only
* transform to change.
*
* The reason we have this method instead of overriding
* GetAttributeChangeHint is because we need to act on non-attribute (e.g.
* currentScale) changes in addition to attribute (e.g. viewBox) changes.
*/
void ChildrenOnlyTransformChanged(uint32_t aFlags = 0);
// This services any pending notifications for the transform on on this root
// <svg> node needing to be recalculated. (Only applicable in
// SVG-as-an-image documents.)
virtual void FlushImageTransformInvalidation();
virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
bool aPreallocateChildren) const override;
// Returns true IFF our attributes are currently overridden by a <view>
// element and that element's ID matches the passed-in string.
bool IsOverriddenBy(const nsAString &aViewID) const {
return mCurrentViewID && mCurrentViewID->Equals(aViewID);
}
svgFloatSize GetViewportSize() const {
return svgFloatSize(mViewportWidth, mViewportHeight);
}
void SetViewportSize(const svgFloatSize& aSize) {
mViewportWidth = aSize.width;
mViewportHeight = aSize.height;
}
// WebIDL
already_AddRefed<SVGAnimatedLength> X();
already_AddRefed<SVGAnimatedLength> Y();
already_AddRefed<SVGAnimatedLength> Width();
already_AddRefed<SVGAnimatedLength> Height();
float PixelUnitToMillimeterX();
float PixelUnitToMillimeterY();
float ScreenPixelToMillimeterX();
float ScreenPixelToMillimeterY();
bool UseCurrentView();
float CurrentScale();
void SetCurrentScale(float aCurrentScale);
already_AddRefed<nsISVGPoint> CurrentTranslate();
void SetCurrentTranslate(float x, float y);
uint32_t SuspendRedraw(uint32_t max_wait_milliseconds);
void UnsuspendRedraw(uint32_t suspend_handle_id);
void UnsuspendRedrawAll();
void ForceRedraw();
void PauseAnimations();
void UnpauseAnimations();
bool AnimationsPaused();
float GetCurrentTime();
void SetCurrentTime(float seconds);
void DeselectAll();
already_AddRefed<DOMSVGNumber> CreateSVGNumber();
already_AddRefed<DOMSVGLength> CreateSVGLength();
already_AddRefed<SVGAngle> CreateSVGAngle();
already_AddRefed<nsISVGPoint> CreateSVGPoint();
already_AddRefed<SVGMatrix> CreateSVGMatrix();
already_AddRefed<SVGIRect> CreateSVGRect();
already_AddRefed<SVGTransform> CreateSVGTransform();
already_AddRefed<SVGTransform> CreateSVGTransformFromMatrix(SVGMatrix& matrix);
using nsINode::GetElementById; // This does what we want
already_AddRefed<SVGAnimatedRect> ViewBox();
already_AddRefed<DOMSVGAnimatedPreserveAspectRatio> PreserveAspectRatio();
uint16_t ZoomAndPan();
void SetZoomAndPan(uint16_t aZoomAndPan, ErrorResult& rv);
virtual nsSVGViewBox* GetViewBox() override;
private:
// nsSVGElement overrides
virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers) override;
virtual void UnbindFromTree(bool aDeep, bool aNullParent) override;
// implementation helpers:
SVGViewElement* GetCurrentViewElement() const;
// Methods for <image> elements to override my "PreserveAspectRatio" value.
// These are private so that only our friends
// (AutoPreserveAspectRatioOverride in particular) have access.
void SetImageOverridePreserveAspectRatio(const SVGPreserveAspectRatio& aPAR);
void ClearImageOverridePreserveAspectRatio();
// Set/Clear properties to hold old version of preserveAspectRatio
// when it's being overridden by an <image> element that we are inside of.
bool SetPreserveAspectRatioProperty(const SVGPreserveAspectRatio& aPAR);
const SVGPreserveAspectRatio* GetPreserveAspectRatioProperty() const;
bool ClearPreserveAspectRatioProperty();
bool IsRoot() const {
NS_ASSERTION((IsInUncomposedDoc() && !GetParent()) ==
(OwnerDoc() && (OwnerDoc()->GetRootElement() == this)),
"Can't determine if we're root");
return IsInUncomposedDoc() && !GetParent();
}
/**
* Returns true if this is an SVG <svg> element that is the child of
* another non-foreignObject SVG element.
*/
bool IsInner() const {
const nsIContent *parent = GetFlattenedTreeParent();
return parent && parent->IsSVGElement() &&
!parent->IsSVGElement(nsGkAtoms::foreignObject);
}
/*
* While binding to the tree we need to determine if we will be the outermost
* <svg> element _before_ the children are bound (as they want to know what
* timed document root to register with) and therefore _before_ our parent is
* set (both actions are performed by Element::BindToTree) so we
* can't use GetOwnerSVGElement() as it relies on GetParent(). This code is
* basically a simplified version of GetOwnerSVGElement that uses the parent
* parameters passed in instead.
*/
bool WillBeOutermostSVG(nsIContent* aParent,
nsIContent* aBindingParent) const;
// invalidate viewbox -> viewport xform & inform frames
void InvalidateTransformNotifyFrame();
// Returns true if we have at least one of the following:
// - a (valid or invalid) value for the preserveAspectRatio attribute
// - a SMIL-animated value for the preserveAspectRatio attribute
bool HasPreserveAspectRatio();
/**
* Returns the explicit viewBox rect, if specified, or else a synthesized
* viewBox, if appropriate, or else a viewBox matching the dimensions of the
* SVG viewport.
*/
nsSVGViewBoxRect GetViewBoxWithSynthesis(
float aViewportWidth, float aViewportHeight) const;
/**
* Returns the explicit or default preserveAspectRatio, unless we're
* synthesizing a viewBox, in which case it returns the "none" value.
*/
SVGPreserveAspectRatio GetPreserveAspectRatioWithOverride() const;
virtual LengthAttributesInfo GetLengthInfo() override;
enum { ATTR_X, ATTR_Y, ATTR_WIDTH, ATTR_HEIGHT };
nsSVGLength2 mLengthAttributes[4];
static LengthInfo sLengthInfo[4];
virtual EnumAttributesInfo GetEnumInfo() override;
enum { ZOOMANDPAN };
nsSVGEnum mEnumAttributes[1];
static nsSVGEnumMapping sZoomAndPanMap[];
static EnumInfo sEnumInfo[1];
virtual SVGAnimatedPreserveAspectRatio *GetPreserveAspectRatio() override;
nsSVGViewBox mViewBox;
SVGAnimatedPreserveAspectRatio mPreserveAspectRatio;
// mCurrentViewID and mSVGView are mutually exclusive; we can have
// at most one non-null.
nsAutoPtr<nsString> mCurrentViewID;
nsAutoPtr<SVGView> mSVGView;
// The size of the rectangular SVG viewport into which we render. This is
// not (necessarily) the same as the content area. See:
//
// http://www.w3.org/TR/SVG11/coords.html#ViewportSpace
//
// XXXjwatt Currently only used for outer <svg>, but maybe we could use -1 to
// flag this as an inner <svg> to save the overhead of GetCtx calls?
// XXXjwatt our frame should probably reset these when it's destroyed.
float mViewportWidth, mViewportHeight;
// The time container for animations within this SVG document fragment. Set
// for all outermost <svg> elements (not nested <svg> elements).
nsAutoPtr<nsSMILTimeContainer> mTimedDocumentRoot;
// zoom and pan
// IMPORTANT: see the comment in RecordCurrentScaleTranslate before writing
// code to change any of these!
SVGPoint mCurrentTranslate;
float mCurrentScale;
SVGPoint mPreviousTranslate;
float mPreviousScale;
// For outermost <svg> elements created from parsing, animation is started by
// the onload event in accordance with the SVG spec, but for <svg> elements
// created by script or promoted from inner <svg> to outermost <svg> we need
// to manually kick off animation when they are bound to the tree.
bool mStartAnimationOnBindToTree;
bool mImageNeedsTransformInvalidation;
bool mHasChildrenOnlyTransform;
};
} // namespace dom
class MOZ_RAII AutoPreserveAspectRatioOverride
{
public:
AutoPreserveAspectRatioOverride(const Maybe<SVGImageContext>& aSVGContext,
dom::SVGSVGElement* aRootElem
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mRootElem(aRootElem)
, mDidOverride(false)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
MOZ_ASSERT(mRootElem, "No SVG node to manage?");
if (aSVGContext.isSome() &&
aSVGContext->GetPreserveAspectRatio().isSome()) {
// Override preserveAspectRatio in our helper document.
// XXXdholbert We should technically be overriding the helper doc's clip
// and overflow properties here, too. See bug 272288 comment 36.
mRootElem->SetImageOverridePreserveAspectRatio(
*aSVGContext->GetPreserveAspectRatio());
mDidOverride = true;
}
}
~AutoPreserveAspectRatioOverride()
{
if (mDidOverride) {
mRootElem->ClearImageOverridePreserveAspectRatio();
}
}
private:
const RefPtr<dom::SVGSVGElement> mRootElem;
bool mDidOverride;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_RAII AutoSVGTimeSetRestore
{
public:
AutoSVGTimeSetRestore(dom::SVGSVGElement* aRootElem,
float aFrameTime
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mRootElem(aRootElem)
, mOriginalTime(mRootElem->GetCurrentTime())
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
mRootElem->SetCurrentTime(aFrameTime); // Does nothing if there's no change.
}
~AutoSVGTimeSetRestore()
{
mRootElem->SetCurrentTime(mOriginalTime);
}
private:
const RefPtr<dom::SVGSVGElement> mRootElem;
const float mOriginalTime;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
} // namespace mozilla
#endif // SVGSVGElement_h