/* -*- 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/. */ #ifndef nsAccUtils_h_ #define nsAccUtils_h_ #include "mozilla/a11y/Accessible.h" #include "mozilla/a11y/DocManager.h" #include "AccessibleOrProxy.h" #include "nsAccessibilityService.h" #include "nsCoreUtils.h" #include "nsIDocShell.h" #include "nsPoint.h" namespace mozilla { class PresShell; namespace dom { class Element; } namespace a11y { class HyperTextAccessible; class DocAccessible; class Attribute; class nsAccUtils { public: /** * Returns value of attribute from the given attributes container. * * @param aAttributes - attributes container * @param aAttrName - the name of requested attribute * @param aAttrValue - value of attribute */ static void GetAccAttr(nsIPersistentProperties* aAttributes, nsAtom* aAttrName, nsAString& aAttrValue); /** * Set value of attribute for the given attributes container. * * @param aAttributes - attributes container * @param aAttrName - the name of requested attribute * @param aAttrValue - new value of attribute */ static void SetAccAttr(nsIPersistentProperties* aAttributes, nsAtom* aAttrName, const nsAString& aAttrValue); static void SetAccAttr(nsIPersistentProperties* aAttributes, nsAtom* aAttrName, nsAtom* aAttrValue); /** * Set group attributes ('level', 'setsize', 'posinset'). */ static void SetAccGroupAttrs(nsIPersistentProperties* aAttributes, int32_t aLevel, int32_t aSetSize, int32_t aPosInSet); /** * Get default value of the level for the given accessible. */ static int32_t GetDefaultLevel(const Accessible* aAcc); /** * Return ARIA level value or the default one if ARIA is missed for the * given accessible. */ static int32_t GetARIAOrDefaultLevel(const Accessible* aAccessible); /** * Compute group level for nsIDOMXULContainerItemElement node. */ static int32_t GetLevelForXULContainerItem(nsIContent* aContent); /** * Set container-foo live region attributes for the given node. * * @param aAttributes where to store the attributes * @param aStartContent node to start from * @param aTopContent node to end at */ static void SetLiveContainerAttributes(nsIPersistentProperties* aAttributes, nsIContent* aStartContent, mozilla::dom::Element* aTopEl); /** * Any ARIA property of type boolean or NMTOKEN is undefined if the ARIA * property is not present, or is "" or "undefined". Do not call * this method for properties of type string, decimal, IDREF or IDREFS. * * Return true if the ARIA property is defined, otherwise false */ static bool HasDefinedARIAToken(nsIContent* aContent, nsAtom* aAtom); /** * Return atomic value of ARIA attribute of boolean or NMTOKEN type. */ static nsStaticAtom* GetARIAToken(mozilla::dom::Element* aElement, nsAtom* aAttr); /** * If the given ARIA attribute has a specific known token value, return it. * If the specification demands for a fallback value for unknown attribute * values, return that. For all others, return a nullptr. */ static nsStaticAtom* NormalizeARIAToken(mozilla::dom::Element* aElement, nsAtom* aAttr); /** * Return document accessible for the given DOM node. */ static DocAccessible* GetDocAccessibleFor(nsINode* aNode) { return GetAccService()->GetDocAccessible( nsCoreUtils::GetPresShellFor(aNode)); } /** * Return document accessible for the given docshell. */ static DocAccessible* GetDocAccessibleFor(nsIDocShellTreeItem* aContainer) { nsCOMPtr docShell(do_QueryInterface(aContainer)); return GetAccService()->GetDocAccessible(docShell->GetPresShell()); } /** * Return single or multi selectable container for the given item. * * @param aAccessible [in] the item accessible * @param aState [in] the state of the item accessible */ static Accessible* GetSelectableContainer(Accessible* aAccessible, uint64_t aState); /** * Return a text container accessible for the given node. */ static HyperTextAccessible* GetTextContainer(nsINode* aNode); static Accessible* TableFor(Accessible* aRow); /** * Return true if the DOM node of a given accessible has a given attribute * with a value of "true". */ static bool IsDOMAttrTrue(const Accessible* aAccessible, nsAtom* aAttr); /** * Return true if the DOM node of given accessible has aria-selected="true" * attribute. */ static inline bool IsARIASelected(const Accessible* aAccessible) { return IsDOMAttrTrue(aAccessible, nsGkAtoms::aria_selected); } /** * Return true if the DOM node of given accessible has * aria-multiselectable="true" attribute. */ static inline bool IsARIAMultiSelectable(const Accessible* aAccessible) { return IsDOMAttrTrue(aAccessible, nsGkAtoms::aria_multiselectable); } /** * Converts the given coordinates to coordinates relative screen. * * @param aX [in] the given x coord * @param aY [in] the given y coord * @param aCoordinateType [in] specifies coordinates origin (refer to * nsIAccessibleCoordinateType) * @param aAccessible [in] the accessible if coordinates are given * relative it. * @return converted coordinates */ static nsIntPoint ConvertToScreenCoords(int32_t aX, int32_t aY, uint32_t aCoordinateType, Accessible* aAccessible); /** * Converts the given coordinates relative screen to another coordinate * system. * * @param aX [in, out] the given x coord * @param aY [in, out] the given y coord * @param aCoordinateType [in] specifies coordinates origin (refer to * nsIAccessibleCoordinateType) * @param aAccessible [in] the accessible if coordinates are given * relative it */ static void ConvertScreenCoordsTo(int32_t* aX, int32_t* aY, uint32_t aCoordinateType, Accessible* aAccessible); /** * Returns coordinates relative screen for the parent of the given accessible. * * @param [in] aAccessible the accessible */ static nsIntPoint GetScreenCoordsForParent(Accessible* aAccessible); /** * Get the 'live' or 'container-live' object attribute value from the given * ELiveAttrRule constant. * * @param aRule [in] rule constant (see ELiveAttrRule in nsAccMap.h) * @param aValue [out] object attribute value * * @return true if object attribute should be exposed */ static bool GetLiveAttrValue(uint32_t aRule, nsAString& aValue); #ifdef DEBUG /** * Detect whether the given accessible object implements nsIAccessibleText, * when it is text or has text child node. */ static bool IsTextInterfaceSupportCorrect(Accessible* aAccessible); #endif /** * Return text length of the given accessible, return 0 on failure. */ static uint32_t TextLength(Accessible* aAccessible); /** * Transform nsIAccessibleStates constants to internal state constant. */ static inline uint64_t To64State(uint32_t aState1, uint32_t aState2) { return static_cast(aState1) + (static_cast(aState2) << 31); } /** * Transform internal state constant to nsIAccessibleStates constants. */ static inline void To32States(uint64_t aState64, uint32_t* aState1, uint32_t* aState2) { *aState1 = aState64 & 0x7fffffff; if (aState2) *aState2 = static_cast(aState64 >> 31); } static uint32_t To32States(uint64_t aState, bool* aIsExtra) { uint32_t extraState = aState >> 31; *aIsExtra = !!extraState; return aState | extraState; } /** * Return true if the given accessible can't have children. Used when exposing * to platform accessibility APIs, should the children be pruned off? */ static bool MustPrune(AccessibleOrProxy aAccessible); static bool PersistentPropertiesToArray(nsIPersistentProperties* aProps, nsTArray* aAttributes); /** * Return true if the given accessible is within an ARIA live region; i.e. * the container-live attribute would be something other than "off" or empty. */ static bool IsARIALive(const Accessible* aAccessible); }; } // namespace a11y } // namespace mozilla #endif