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Diffstat (limited to 'accessible/base/nsAccUtils.h')
| -rw-r--r-- | accessible/base/nsAccUtils.h | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/accessible/base/nsAccUtils.h b/accessible/base/nsAccUtils.h new file mode 100644 index 000000000..9a9bc2590 --- /dev/null +++ b/accessible/base/nsAccUtils.h @@ -0,0 +1,243 @@ +/* -*- 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 "nsAccessibilityService.h" +#include "nsCoreUtils.h" + +#include "nsIDocShell.h" +#include "nsPoint.h" + +namespace mozilla { + +namespace dom { +class Element; +} + +namespace a11y { + +class HyperTextAccessible; +class DocAccessible; + +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, + nsIAtom *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, + nsIAtom *aAttrName, + const nsAString& aAttrValue); + + static void SetAccAttr(nsIPersistentProperties *aAttributes, + nsIAtom* aAttrName, + nsIAtom* 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(Accessible* aAcc); + + /** + * Return ARIA level value or the default one if ARIA is missed for the + * given accessible. + */ + static int32_t GetARIAOrDefaultLevel(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, nsIAtom *aAtom); + + /** + * Return atomic value of ARIA attribute of boolean or NMTOKEN type. + */ + static nsIAtom* GetARIAToken(mozilla::dom::Element* aElement, nsIAtom* aAttr); + + /** + * Return document accessible for the given DOM node. + */ + static DocAccessible* GetDocAccessibleFor(nsINode* aNode) + { + nsIPresShell *presShell = nsCoreUtils::GetPresShellFor(aNode); + return GetAccService()->GetDocAccessible(presShell); + } + + /** + * 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 given accessible has aria-selected="true" + * attribute. + */ + static bool IsARIASelected(Accessible* aAccessible); + + /** + * 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(Accessible* aAccessible); +}; + +} // namespace a11y +} // namespace mozilla + +#endif |