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-rw-r--r--accessible/base/nsAccUtils.h270
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+/* -*- 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
+ */
+ static void SetLiveContainerAttributes(nsIPersistentProperties* aAttributes,
+ nsIContent* aStartContent);
+
+ /**
+ * 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<nsIDocShell> 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<uint64_t>(aState1) +
+ (static_cast<uint64_t>(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<uint32_t>(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<Attribute>* 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
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