зеркало из https://github.com/mozilla/gecko-dev.git
438 строки
16 KiB
C++
438 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_HTMLImageElement_h
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#define mozilla_dom_HTMLImageElement_h
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#include "mozilla/Attributes.h"
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#include "nsGenericHTMLElement.h"
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#include "nsImageLoadingContent.h"
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#include "nsIDOMHTMLImageElement.h"
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#include "imgRequestProxy.h"
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#include "Units.h"
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#include "nsCycleCollectionParticipant.h"
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namespace mozilla {
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class EventChainPreVisitor;
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namespace dom {
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class ImageLoadTask;
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class ResponsiveImageSelector;
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class HTMLImageElement final : public nsGenericHTMLElement,
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public nsImageLoadingContent,
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public nsIDOMHTMLImageElement
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{
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friend class HTMLSourceElement;
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friend class HTMLPictureElement;
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friend class ImageLoadTask;
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public:
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explicit HTMLImageElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
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static already_AddRefed<HTMLImageElement>
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Image(const GlobalObject& aGlobal,
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const Optional<uint32_t>& aWidth,
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const Optional<uint32_t>& aHeight,
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ErrorResult& aError);
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLImageElement,
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nsGenericHTMLElement)
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// nsISupports
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NS_DECL_ISUPPORTS_INHERITED
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virtual bool Draggable() const override;
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// Element
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virtual bool IsInteractiveHTMLContent(bool aIgnoreTabindex) const override;
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// EventTarget
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virtual void AsyncEventRunning(AsyncEventDispatcher* aEvent) override;
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// nsIDOMHTMLImageElement
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NS_DECL_NSIDOMHTMLIMAGEELEMENT
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NS_IMPL_FROMCONTENT_HTML_WITH_TAG(HTMLImageElement, img)
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// override from nsImageLoadingContent
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CORSMode GetCORSMode() override;
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// nsIContent
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virtual bool ParseAttribute(int32_t aNamespaceID,
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nsIAtom* aAttribute,
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const nsAString& aValue,
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nsAttrValue& aResult) override;
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virtual nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute,
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int32_t aModType) const override;
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NS_IMETHOD_(bool) IsAttributeMapped(const nsIAtom* aAttribute) const override;
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virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const override;
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virtual nsresult GetEventTargetParent(
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EventChainPreVisitor& aVisitor) override;
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bool IsHTMLFocusable(bool aWithMouse, bool *aIsFocusable, int32_t *aTabIndex) override;
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virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers) override;
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virtual void UnbindFromTree(bool aDeep, bool aNullParent) override;
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virtual EventStates IntrinsicState() const override;
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virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
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bool aPreallocateChildren) const override;
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virtual void NodeInfoChanged(nsIDocument* aOldDoc) override;
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nsresult CopyInnerTo(Element* aDest, bool aPreallocateChildren);
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void MaybeLoadImage(bool aAlwaysForceLoad);
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bool IsMap()
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{
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return GetBoolAttr(nsGkAtoms::ismap);
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}
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void SetIsMap(bool aIsMap, ErrorResult& aError)
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{
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SetHTMLBoolAttr(nsGkAtoms::ismap, aIsMap, aError);
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}
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uint32_t Width()
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{
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return GetWidthHeightForImage(mCurrentRequest).width;
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}
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void SetWidth(uint32_t aWidth, ErrorResult& aError)
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{
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SetUnsignedIntAttr(nsGkAtoms::width, aWidth, 0, aError);
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}
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uint32_t Height()
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{
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return GetWidthHeightForImage(mCurrentRequest).height;
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}
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void SetHeight(uint32_t aHeight, ErrorResult& aError)
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{
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SetUnsignedIntAttr(nsGkAtoms::height, aHeight, 0, aError);
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}
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uint32_t NaturalWidth();
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uint32_t NaturalHeight();
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bool Complete();
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uint32_t Hspace()
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{
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return GetUnsignedIntAttr(nsGkAtoms::hspace, 0);
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}
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void SetHspace(uint32_t aHspace, ErrorResult& aError)
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{
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SetUnsignedIntAttr(nsGkAtoms::hspace, aHspace, 0, aError);
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}
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uint32_t Vspace()
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{
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return GetUnsignedIntAttr(nsGkAtoms::vspace, 0);
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}
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void SetVspace(uint32_t aVspace, ErrorResult& aError)
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{
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SetUnsignedIntAttr(nsGkAtoms::vspace, aVspace, 0, aError);
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}
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void GetAlt(nsAString& aAlt)
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{
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GetHTMLAttr(nsGkAtoms::alt, aAlt);
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}
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void SetAlt(const nsAString& aAlt, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::alt, aAlt, aError);
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}
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void GetSrc(nsAString& aSrc)
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{
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GetURIAttr(nsGkAtoms::src, nullptr, aSrc);
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}
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void SetSrc(const nsAString& aSrc, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::src, aSrc, aError);
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}
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void GetSrcset(nsAString& aSrcset)
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{
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GetHTMLAttr(nsGkAtoms::srcset, aSrcset);
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}
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void SetSrcset(const nsAString& aSrcset, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::srcset, aSrcset, aError);
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}
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void GetCrossOrigin(nsAString& aResult)
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{
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// Null for both missing and invalid defaults is ok, since we
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// always parse to an enum value, so we don't need an invalid
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// default, and we _want_ the missing default to be null.
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GetEnumAttr(nsGkAtoms::crossorigin, nullptr, aResult);
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}
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void SetCrossOrigin(const nsAString& aCrossOrigin, ErrorResult& aError)
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{
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SetOrRemoveNullableStringAttr(nsGkAtoms::crossorigin, aCrossOrigin, aError);
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}
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void GetUseMap(nsAString& aUseMap)
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{
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GetHTMLAttr(nsGkAtoms::usemap, aUseMap);
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}
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void SetUseMap(const nsAString& aUseMap, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::usemap, aUseMap, aError);
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}
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void GetName(nsAString& aName)
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{
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GetHTMLAttr(nsGkAtoms::name, aName);
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}
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void SetName(const nsAString& aName, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::name, aName, aError);
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}
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void GetAlign(nsAString& aAlign)
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{
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GetHTMLAttr(nsGkAtoms::align, aAlign);
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}
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void SetAlign(const nsAString& aAlign, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::align, aAlign, aError);
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}
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void GetLongDesc(nsAString& aLongDesc)
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{
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GetURIAttr(nsGkAtoms::longdesc, nullptr, aLongDesc);
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}
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void SetLongDesc(const nsAString& aLongDesc, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::longdesc, aLongDesc, aError);
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}
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void GetSizes(nsAString& aSizes)
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{
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GetHTMLAttr(nsGkAtoms::sizes, aSizes);
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}
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void SetSizes(const nsAString& aSizes, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::sizes, aSizes, aError);
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}
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void GetCurrentSrc(nsAString& aValue);
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void GetBorder(nsAString& aBorder)
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{
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GetHTMLAttr(nsGkAtoms::border, aBorder);
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}
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void SetBorder(const nsAString& aBorder, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::border, aBorder, aError);
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}
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void SetReferrerPolicy(const nsAString& aReferrer, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::referrerpolicy, aReferrer, aError);
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}
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void GetReferrerPolicy(nsAString& aReferrer)
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{
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GetEnumAttr(nsGkAtoms::referrerpolicy, EmptyCString().get(), aReferrer);
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}
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net::ReferrerPolicy
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GetImageReferrerPolicy() override
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{
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return GetReferrerPolicyAsEnum();
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}
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int32_t X();
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int32_t Y();
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void GetLowsrc(nsAString& aLowsrc)
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{
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GetURIAttr(nsGkAtoms::lowsrc, nullptr, aLowsrc);
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}
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void SetLowsrc(const nsAString& aLowsrc, ErrorResult& aError)
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{
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SetHTMLAttr(nsGkAtoms::lowsrc, aLowsrc, aError);
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}
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#ifdef DEBUG
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nsIDOMHTMLFormElement* GetForm() const;
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#endif
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void SetForm(nsIDOMHTMLFormElement* aForm);
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void ClearForm(bool aRemoveFromForm);
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virtual void DestroyContent() override;
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void MediaFeatureValuesChanged();
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/**
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* Given a hypothetical <img> or <source> tag with the given parameters,
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* return what URI we would attempt to use, if any. Used by the preloader to
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* resolve sources prior to DOM creation.
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*
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* @param aDocument The document this image would be for, for referencing
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* viewport width and DPI/zoom
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* @param aIsSourceTag If these parameters are for a <source> tag (as in a
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* <picture>) rather than an <img> tag. Note that some attrs are unused
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* when this is true an vice versa
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* @param aSrcAttr [ignored if aIsSourceTag] The src attr for this image.
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* @param aSrcsetAttr The srcset attr for this image/source
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* @param aSizesAttr The sizes attr for this image/source
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* @param aTypeAttr [ignored if !aIsSourceTag] The type attr for this source.
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* Should be a void string to differentiate no type attribute
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* from an empty one.
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* @param aMediaAttr [ignored if !aIsSourceTag] The media attr for this
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* source. Should be a void string to differentiate no
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* media attribute from an empty one.
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* @param aResult A reference to store the resulting URL spec in if we
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* selected a source. This value is not guaranteed to parse to
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* a valid URL, merely the URL that the tag would attempt to
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* resolve and load (which may be the empty string). This
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* parameter is not modified if return value is false.
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* @return True if we were able to select a final source, false if further
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* sources would be considered. It follows that this always returns
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* true if !aIsSourceTag.
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*
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* Note that the return value may be true with an empty string as the result,
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* which implies that the parameters provided describe a tag that would select
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* no source. This is distinct from a return of false which implies that
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* further <source> or <img> tags would be considered.
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*/
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static bool
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SelectSourceForTagWithAttrs(nsIDocument *aDocument,
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bool aIsSourceTag,
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const nsAString& aSrcAttr,
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const nsAString& aSrcsetAttr,
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const nsAString& aSizesAttr,
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const nsAString& aTypeAttr,
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const nsAString& aMediaAttr,
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nsAString& aResult);
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/**
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* If this image's src pointers to an SVG document, flush the SVG document's
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* use counters to telemetry. Only used for testing purposes.
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*/
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void FlushUseCounters();
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protected:
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virtual ~HTMLImageElement();
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// Queues a task to run LoadSelectedImage pending stable state.
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//
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// Pending Bug 1076583 this is only used by the responsive image
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// algorithm (InResponsiveMode()) -- synchronous actions when just
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// using img.src will bypass this, and update source and kick off
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// image load synchronously.
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void QueueImageLoadTask(bool aAlwaysLoad);
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// True if we have a srcset attribute or a <picture> parent, regardless of if
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// any valid responsive sources were parsed from either.
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bool HaveSrcsetOrInPicture();
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// True if we are using the newer image loading algorithm. This will be the
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// only mode after Bug 1076583
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bool InResponsiveMode();
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// True if the given URL and density equal the last URL and density that was loaded by this element.
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bool SelectedSourceMatchesLast(nsIURI* aSelectedSource, double aSelectedDensity);
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// Resolve and load the current mResponsiveSelector (responsive mode) or src
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// attr image.
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nsresult LoadSelectedImage(bool aForce, bool aNotify, bool aAlwaysLoad);
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// True if this string represents a type we would support on <source type>
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static bool SupportedPictureSourceType(const nsAString& aType);
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// Update/create/destroy mResponsiveSelector
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void PictureSourceSrcsetChanged(nsIContent *aSourceNode,
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const nsAString& aNewValue, bool aNotify);
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void PictureSourceSizesChanged(nsIContent *aSourceNode,
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const nsAString& aNewValue, bool aNotify);
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// As we re-run the source selection on these mutations regardless,
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// we don't actually care which changed or to what
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void PictureSourceMediaOrTypeChanged(nsIContent *aSourceNode, bool aNotify);
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void PictureSourceAdded(nsIContent *aSourceNode);
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// This should be called prior to the unbind, such that nextsibling works
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void PictureSourceRemoved(nsIContent *aSourceNode);
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// Re-evaluates all source nodes (picture <source>,<img>) and finds
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// the best source set for mResponsiveSelector. If a better source
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// is found, creates a new selector and feeds the source to it. If
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// the current ResponsiveSelector is not changed, runs
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// SelectImage(true) to re-evaluate its candidates.
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//
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// Because keeping the existing selector is the common case (and we
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// often do no-op reselections), this does not re-parse values for
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// the existing mResponsiveSelector, meaning you need to update its
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// parameters as appropriate before calling (or null it out to force
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// recreation)
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//
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// Returns true if the source has changed, and false otherwise.
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bool UpdateResponsiveSource();
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// Given a <source> node that is a previous sibling *or* ourselves, try to
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// create a ResponsiveSelector.
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// If the node's srcset/sizes make for an invalid selector, returns
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// false. This does not guarantee the resulting selector matches an image,
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// only that it is valid.
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bool TryCreateResponsiveSelector(nsIContent *aSourceNode);
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CSSIntPoint GetXY();
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virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
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void UpdateFormOwner();
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virtual nsresult BeforeSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
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const nsAttrValueOrString* aValue,
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bool aNotify) override;
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virtual nsresult AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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bool aNotify) override;
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virtual nsresult OnAttrSetButNotChanged(int32_t aNamespaceID, nsIAtom* aName,
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const nsAttrValueOrString& aValue,
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bool aNotify) override;
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// Override for nsImageLoadingContent.
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nsIContent* AsContent() override { return this; }
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NS_IMETHOD GetNaturalWidth(uint32_t* aNaturalWidth) override;
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NS_IMETHOD GetNaturalHeight(uint32_t* aNaturalHeight) override;
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// This is a weak reference that this element and the HTMLFormElement
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// cooperate in maintaining.
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HTMLFormElement* mForm;
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// Created when we're tracking responsive image state
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RefPtr<ResponsiveImageSelector> mResponsiveSelector;
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private:
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bool SourceElementMatches(nsIContent* aSourceNode);
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static void MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
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GenericSpecifiedValues* aGenericData);
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/**
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* This function is called by AfterSetAttr and OnAttrSetButNotChanged.
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* It will not be called if the value is being unset.
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*
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* @param aNamespaceID the namespace of the attr being set
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* @param aName the localname of the attribute being set
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* @param aValue the value it's being set to represented as either a string or
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* a parsed nsAttrValue.
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* @param aOldValue the value previously set. Will be null if no value was
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* previously set. This value should only be used when
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* aValueMaybeChanged is true; when aValueMaybeChanged is false,
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* aOldValue should be considered unreliable.
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* @param aValueMaybeChanged will be false when this function is called from
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* OnAttrSetButNotChanged to indicate that the value was not changed.
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* @param aNotify Whether we plan to notify document observers.
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*/
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void AfterMaybeChangeAttr(int32_t aNamespaceID, nsIAtom* aName,
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const nsAttrValueOrString& aValue,
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const nsAttrValue* aOldValue,
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bool aValueMaybeChanged, bool aNotify);
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bool mInDocResponsiveContent;
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RefPtr<ImageLoadTask> mPendingImageLoadTask;
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// Last URL that was attempted to load by this element.
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nsCOMPtr<nsIURI> mLastSelectedSource;
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// Last pixel density that was selected.
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double mCurrentDensity;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_HTMLImageElement_h */
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