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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 __nsAccessibilityService_h__
+#define __nsAccessibilityService_h__
+
+#include "mozilla/a11y/DocManager.h"
+#include "mozilla/a11y/FocusManager.h"
+#include "mozilla/a11y/Platform.h"
+#include "mozilla/a11y/Role.h"
+#include "mozilla/a11y/SelectionManager.h"
+#include "mozilla/Preferences.h"
+
+#include "nsIContent.h"
+#include "nsIObserver.h"
+#include "nsIAccessibleEvent.h"
+#include "nsIEventListenerService.h"
+#include "nsXULAppAPI.h"
+#include "xpcAccessibilityService.h"
+
+class nsImageFrame;
+class nsIArray;
+class nsITreeView;
+
+namespace mozilla {
+
+class PresShell;
+class Monitor;
+namespace dom {
+class DOMStringList;
+class Element;
+} // namespace dom
+
+namespace a11y {
+
+class AccAttributes;
+class Accessible;
+class ApplicationAccessible;
+class xpcAccessibleApplication;
+
+/**
+ * Return focus manager.
+ */
+FocusManager* FocusMgr();
+
+/**
+ * Return selection manager.
+ */
+SelectionManager* SelectionMgr();
+
+/**
+ * Returns the application accessible.
+ */
+ApplicationAccessible* ApplicationAcc();
+xpcAccessibleApplication* XPCApplicationAcc();
+
+typedef LocalAccessible*(New_Accessible)(mozilla::dom::Element* aElement,
+ LocalAccessible* aContext);
+
+// These fields are not `nsStaticAtom* const` because MSVC doesn't like it.
+struct MarkupAttrInfo {
+ nsStaticAtom* name;
+ nsStaticAtom* value;
+
+ nsStaticAtom* DOMAttrName;
+ nsStaticAtom* DOMAttrValue;
+};
+
+struct MarkupMapInfo {
+ const nsStaticAtom* const tag;
+ New_Accessible* new_func;
+ a11y::role role;
+ MarkupAttrInfo attrs[4];
+};
+
+struct XULMarkupMapInfo {
+ const nsStaticAtom* const tag;
+ New_Accessible* new_func;
+};
+
+/**
+ * PREF_ACCESSIBILITY_FORCE_DISABLED preference change callback.
+ */
+void PrefChanged(const char* aPref, void* aClosure);
+
+/**
+ * Read and normalize PREF_ACCESSIBILITY_FORCE_DISABLED preference.
+ */
+EPlatformDisabledState ReadPlatformDisabledState();
+
+} // namespace a11y
+} // namespace mozilla
+
+class nsAccessibilityService final : public mozilla::a11y::DocManager,
+ public mozilla::a11y::FocusManager,
+ public mozilla::a11y::SelectionManager,
+ public nsIListenerChangeListener,
+ public nsIObserver {
+ public:
+ typedef mozilla::a11y::LocalAccessible LocalAccessible;
+ typedef mozilla::a11y::DocAccessible DocAccessible;
+
+ // nsIListenerChangeListener
+ NS_IMETHOD ListenersChanged(nsIArray* aEventChanges) override;
+
+ protected:
+ ~nsAccessibilityService();
+
+ public:
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_NSIOBSERVER
+
+ LocalAccessible* GetRootDocumentAccessible(mozilla::PresShell* aPresShell,
+ bool aCanCreate);
+
+ /**
+ * Adds/remove ATK root accessible for gtk+ native window to/from children
+ * of the application accessible.
+ */
+ LocalAccessible* AddNativeRootAccessible(void* aAtkAccessible);
+ void RemoveNativeRootAccessible(LocalAccessible* aRootAccessible);
+
+ bool HasAccessible(nsINode* aDOMNode);
+
+ /**
+ * Get a string equivalent for an accessible role value.
+ */
+ void GetStringRole(uint32_t aRole, nsAString& aString);
+
+ /**
+ * Get a string equivalent for an accessible state/extra state.
+ */
+ already_AddRefed<mozilla::dom::DOMStringList> GetStringStates(
+ uint64_t aStates) const;
+ void GetStringStates(uint32_t aState, uint32_t aExtraState,
+ nsISupports** aStringStates);
+
+ /**
+ * Get a string equivalent for an accessible event value.
+ */
+ void GetStringEventType(uint32_t aEventType, nsAString& aString);
+
+ /**
+ * Get a string equivalent for an accessible event value.
+ */
+ void GetStringEventType(uint32_t aEventType, nsACString& aString);
+
+ /**
+ * Get a string equivalent for an accessible relation type.
+ */
+ void GetStringRelationType(uint32_t aRelationType, nsAString& aString);
+
+ // nsAccesibilityService
+ /**
+ * Notification used to update the accessible tree when new content is
+ * inserted.
+ */
+ void ContentRangeInserted(mozilla::PresShell* aPresShell,
+ nsIContent* aStartChild, nsIContent* aEndChild);
+
+ /**
+ * Triggers a re-evaluation of the a11y tree of aContent after the next
+ * refresh. This is important because whether we create accessibles may
+ * depend on the frame tree / style.
+ */
+ void ScheduleAccessibilitySubtreeUpdate(mozilla::PresShell* aPresShell,
+ nsIContent* aStartChild);
+
+ /**
+ * Notification used to update the accessible tree when content is removed.
+ */
+ void ContentRemoved(mozilla::PresShell* aPresShell, nsIContent* aChild);
+
+ /**
+ * Notification used to invalidate the isLayoutTable cache.
+ */
+ void TableLayoutGuessMaybeChanged(mozilla::PresShell* aPresShell,
+ nsIContent* aContent);
+
+ /**
+ * Notifies when a combobox <option> text or label changes.
+ */
+ void ComboboxOptionMaybeChanged(mozilla::PresShell*,
+ nsIContent* aMutatingNode);
+
+ void UpdateText(mozilla::PresShell* aPresShell, nsIContent* aContent);
+
+ /**
+ * Update XUL:tree accessible tree when treeview is changed.
+ */
+ void TreeViewChanged(mozilla::PresShell* aPresShell, nsIContent* aContent,
+ nsITreeView* aView);
+
+ /**
+ * Notify of input@type="element" value change.
+ */
+ void RangeValueChanged(mozilla::PresShell* aPresShell, nsIContent* aContent);
+
+ /**
+ * Update the image map.
+ */
+ void UpdateImageMap(nsImageFrame* aImageFrame);
+
+ /**
+ * Update the label accessible tree when rendered @value is changed.
+ */
+ void UpdateLabelValue(mozilla::PresShell* aPresShell, nsIContent* aLabelElm,
+ const nsString& aNewValue);
+
+ /**
+ * Notify accessibility that anchor jump has been accomplished to the given
+ * target. Used by layout.
+ */
+ void NotifyOfAnchorJumpTo(nsIContent* aTarget);
+
+ /**
+ * Notify that presshell is activated.
+ */
+ void PresShellActivated(mozilla::PresShell* aPresShell);
+
+ /**
+ * Recreate an accessible for the given content node in the presshell.
+ */
+ void RecreateAccessible(mozilla::PresShell* aPresShell, nsIContent* aContent);
+
+ void FireAccessibleEvent(uint32_t aEvent, LocalAccessible* aTarget);
+
+ void NotifyOfPossibleBoundsChange(mozilla::PresShell* aPresShell,
+ nsIContent* aContent);
+
+ void NotifyOfComputedStyleChange(mozilla::PresShell* aPresShell,
+ nsIContent* aContent);
+
+ void NotifyOfTabPanelVisibilityChange(mozilla::PresShell* aPresShell,
+ mozilla::dom::Element* aPanel,
+ bool aVisible);
+
+ void NotifyOfResolutionChange(mozilla::PresShell* aPresShell,
+ float aResolution);
+
+ void NotifyOfDevPixelRatioChange(mozilla::PresShell* aPresShell,
+ int32_t aAppUnitsPerDevPixel);
+
+ // nsAccessibiltiyService
+
+ /**
+ * Return true if accessibility service has been shutdown.
+ */
+ static bool IsShutdown() { return gConsumers == 0; };
+
+ /**
+ * Return true if there should be an image accessible for the given element.
+ */
+ static bool ShouldCreateImgAccessible(mozilla::dom::Element* aElement,
+ DocAccessible* aDocument);
+
+ /**
+ * Creates an accessible for the given DOM node.
+ *
+ * @param aNode [in] the given node
+ * @param aContext [in] context the accessible is created in
+ * @param aIsSubtreeHidden [out, optional] indicates whether the node's
+ * frame and its subtree is hidden
+ */
+ LocalAccessible* CreateAccessible(nsINode* aNode, LocalAccessible* aContext,
+ bool* aIsSubtreeHidden = nullptr);
+
+ mozilla::a11y::role MarkupRole(const nsIContent* aContent) const {
+ const mozilla::a11y::MarkupMapInfo* markupMap =
+ GetMarkupMapInfoFor(aContent);
+ return markupMap ? markupMap->role : mozilla::a11y::roles::NOTHING;
+ }
+
+ /**
+ * Return the associated value for a given attribute if
+ * it appears in the MarkupMap. Otherwise, it returns null. This can be
+ * called with either an nsIContent or an Accessible.
+ */
+ template <typename T>
+ nsStaticAtom* MarkupAttribute(T aSource, nsStaticAtom* aAtom) const {
+ const mozilla::a11y::MarkupMapInfo* markupMap =
+ GetMarkupMapInfoFor(aSource);
+ if (markupMap) {
+ for (size_t i = 0; i < mozilla::ArrayLength(markupMap->attrs); i++) {
+ const mozilla::a11y::MarkupAttrInfo* info = markupMap->attrs + i;
+ if (info->name == aAtom) {
+ return info->value;
+ }
+ }
+ }
+ return nullptr;
+ }
+
+ /**
+ * Set the object attribute defined by markup for the given element.
+ */
+ void MarkupAttributes(mozilla::a11y::Accessible* aAcc,
+ mozilla::a11y::AccAttributes* aAttributes) const;
+
+ /**
+ * A list of possible accessibility service consumers. Accessibility service
+ * can only be shut down when there are no remaining consumers.
+ *
+ * eXPCOM - accessibility service is used by XPCOM.
+ *
+ * eMainProcess - accessibility service was started by main process in the
+ * content process.
+ *
+ * ePlatformAPI - accessibility service is used by the platform api in the
+ * main process.
+ */
+ enum ServiceConsumer {
+ eXPCOM = 1 << 0,
+ eMainProcess = 1 << 1,
+ ePlatformAPI = 1 << 2,
+ };
+
+#if defined(ANDROID)
+ static mozilla::Monitor& GetAndroidMonitor();
+#endif
+
+ private:
+ // nsAccessibilityService creation is controlled by friend
+ // GetOrCreateAccService, keep constructors private.
+ nsAccessibilityService();
+ nsAccessibilityService(const nsAccessibilityService&);
+ nsAccessibilityService& operator=(const nsAccessibilityService&);
+
+ private:
+ /**
+ * Initialize accessibility service.
+ */
+ bool Init();
+
+ /**
+ * Shutdowns accessibility service.
+ */
+ void Shutdown();
+
+ /**
+ * Create an accessible whose type depends on the given frame.
+ */
+ already_AddRefed<LocalAccessible> CreateAccessibleByFrameType(
+ nsIFrame* aFrame, nsIContent* aContent, LocalAccessible* aContext);
+
+ /**
+ * Notify observers about change of the accessibility service's consumers.
+ */
+ void NotifyOfConsumersChange();
+
+ /**
+ * Get a JSON string representing the accessibility service consumers.
+ */
+ void GetConsumers(nsAString& aString);
+
+ /**
+ * Set accessibility service consumers.
+ */
+ void SetConsumers(uint32_t aConsumers, bool aNotify = true);
+
+ /**
+ * Unset accessibility service consumers.
+ */
+ void UnsetConsumers(uint32_t aConsumers);
+
+ /**
+ * Reference for accessibility service instance.
+ */
+ static nsAccessibilityService* gAccessibilityService;
+
+ /**
+ * Reference for application accessible instance.
+ */
+ static mozilla::a11y::ApplicationAccessible* gApplicationAccessible;
+ static mozilla::a11y::xpcAccessibleApplication* gXPCApplicationAccessible;
+
+ /**
+ * Contains a set of accessibility service consumers.
+ */
+ static uint32_t gConsumers;
+
+ using MarkupMap = nsTHashMap<nsPtrHashKey<const nsAtom>,
+ const mozilla::a11y::MarkupMapInfo*>;
+ MarkupMap mHTMLMarkupMap;
+ MarkupMap mMathMLMarkupMap;
+
+ const mozilla::a11y::MarkupMapInfo* GetMarkupMapInfoFor(
+ const nsIContent* aContent) const {
+ if (aContent->IsHTMLElement()) {
+ return mHTMLMarkupMap.Get(aContent->NodeInfo()->NameAtom());
+ }
+ if (aContent->IsMathMLElement()) {
+ return mMathMLMarkupMap.Get(aContent->NodeInfo()->NameAtom());
+ }
+ // This function can be called by MarkupAttribute, etc. which might in turn
+ // be called on a XUL, SVG, etc. element. For example, this can happen
+ // with nsAccUtils::SetLiveContainerAttributes.
+ return nullptr;
+ }
+
+ const mozilla::a11y::MarkupMapInfo* GetMarkupMapInfoFor(
+ mozilla::a11y::Accessible* aAcc) const;
+
+ nsTHashMap<nsPtrHashKey<const nsAtom>, const mozilla::a11y::XULMarkupMapInfo*>
+ mXULMarkupMap;
+
+ friend nsAccessibilityService* GetAccService();
+ friend nsAccessibilityService* GetOrCreateAccService(uint32_t);
+ friend void MaybeShutdownAccService(uint32_t);
+ friend void mozilla::a11y::PrefChanged(const char*, void*);
+ friend mozilla::a11y::FocusManager* mozilla::a11y::FocusMgr();
+ friend mozilla::a11y::SelectionManager* mozilla::a11y::SelectionMgr();
+ friend mozilla::a11y::ApplicationAccessible* mozilla::a11y::ApplicationAcc();
+ friend mozilla::a11y::xpcAccessibleApplication*
+ mozilla::a11y::XPCApplicationAcc();
+ friend class xpcAccessibilityService;
+};
+
+/**
+ * Return the accessibility service instance. (Handy global function)
+ */
+inline nsAccessibilityService* GetAccService() {
+ return nsAccessibilityService::gAccessibilityService;
+}
+
+/**
+ * Return accessibility service instance; creating one if necessary.
+ */
+nsAccessibilityService* GetOrCreateAccService(
+ uint32_t aNewConsumer = nsAccessibilityService::ePlatformAPI);
+
+/**
+ * Shutdown accessibility service if needed.
+ */
+void MaybeShutdownAccService(uint32_t aFormerConsumer);
+
+/**
+ * Return true if we're in a content process and not B2G.
+ */
+inline bool IPCAccessibilityActive() { return XRE_IsContentProcess(); }
+
+/**
+ * Map nsIAccessibleEvents constants to strings. Used by
+ * nsAccessibilityService::GetStringEventType() method.
+ */
+static const char kEventTypeNames[][40] = {
+ "unknown", //
+ "show", // EVENT_SHOW
+ "hide", // EVENT_HIDE
+ "reorder", // EVENT_REORDER
+ "active decendent change", // EVENT_ACTIVE_DECENDENT_CHANGED
+ "focus", // EVENT_FOCUS
+ "state change", // EVENT_STATE_CHANGE
+ "location change", // EVENT_LOCATION_CHANGE
+ "name changed", // EVENT_NAME_CHANGE
+ "description change", // EVENT_DESCRIPTION_CHANGE
+ "value change", // EVENT_VALUE_CHANGE
+ "help change", // EVENT_HELP_CHANGE
+ "default action change", // EVENT_DEFACTION_CHANGE
+ "action change", // EVENT_ACTION_CHANGE
+ "accelerator change", // EVENT_ACCELERATOR_CHANGE
+ "selection", // EVENT_SELECTION
+ "selection add", // EVENT_SELECTION_ADD
+ "selection remove", // EVENT_SELECTION_REMOVE
+ "selection within", // EVENT_SELECTION_WITHIN
+ "alert", // EVENT_ALERT
+ "foreground", // EVENT_FOREGROUND
+ "menu start", // EVENT_MENU_START
+ "menu end", // EVENT_MENU_END
+ "menupopup start", // EVENT_MENUPOPUP_START
+ "menupopup end", // EVENT_MENUPOPUP_END
+ "capture start", // EVENT_CAPTURE_START
+ "capture end", // EVENT_CAPTURE_END
+ "movesize start", // EVENT_MOVESIZE_START
+ "movesize end", // EVENT_MOVESIZE_END
+ "contexthelp start", // EVENT_CONTEXTHELP_START
+ "contexthelp end", // EVENT_CONTEXTHELP_END
+ "dragdrop start", // EVENT_DRAGDROP_START
+ "dragdrop end", // EVENT_DRAGDROP_END
+ "dialog start", // EVENT_DIALOG_START
+ "dialog end", // EVENT_DIALOG_END
+ "scrolling start", // EVENT_SCROLLING_START
+ "scrolling end", // EVENT_SCROLLING_END
+ "minimize start", // EVENT_MINIMIZE_START
+ "minimize end", // EVENT_MINIMIZE_END
+ "document load complete", // EVENT_DOCUMENT_LOAD_COMPLETE
+ "document reload", // EVENT_DOCUMENT_RELOAD
+ "document load stopped", // EVENT_DOCUMENT_LOAD_STOPPED
+ "document attributes changed", // EVENT_DOCUMENT_ATTRIBUTES_CHANGED
+ "document content changed", // EVENT_DOCUMENT_CONTENT_CHANGED
+ "property changed", // EVENT_PROPERTY_CHANGED
+ "page changed", // EVENT_PAGE_CHANGED
+ "text attribute changed", // EVENT_TEXT_ATTRIBUTE_CHANGED
+ "text caret moved", // EVENT_TEXT_CARET_MOVED
+ "text changed", // EVENT_TEXT_CHANGED
+ "text inserted", // EVENT_TEXT_INSERTED
+ "text removed", // EVENT_TEXT_REMOVED
+ "text updated", // EVENT_TEXT_UPDATED
+ "text selection changed", // EVENT_TEXT_SELECTION_CHANGED
+ "visible data changed", // EVENT_VISIBLE_DATA_CHANGED
+ "text column changed", // EVENT_TEXT_COLUMN_CHANGED
+ "section changed", // EVENT_SECTION_CHANGED
+ "table caption changed", // EVENT_TABLE_CAPTION_CHANGED
+ "table model changed", // EVENT_TABLE_MODEL_CHANGED
+ "table summary changed", // EVENT_TABLE_SUMMARY_CHANGED
+ "table row description changed", // EVENT_TABLE_ROW_DESCRIPTION_CHANGED
+ "table row header changed", // EVENT_TABLE_ROW_HEADER_CHANGED
+ "table row insert", // EVENT_TABLE_ROW_INSERT
+ "table row delete", // EVENT_TABLE_ROW_DELETE
+ "table row reorder", // EVENT_TABLE_ROW_REORDER
+ "table column description changed", // EVENT_TABLE_COLUMN_DESCRIPTION_CHANGED
+ "table column header changed", // EVENT_TABLE_COLUMN_HEADER_CHANGED
+ "table column insert", // EVENT_TABLE_COLUMN_INSERT
+ "table column delete", // EVENT_TABLE_COLUMN_DELETE
+ "table column reorder", // EVENT_TABLE_COLUMN_REORDER
+ "window activate", // EVENT_WINDOW_ACTIVATE
+ "window create", // EVENT_WINDOW_CREATE
+ "window deactivate", // EVENT_WINDOW_DEACTIVATE
+ "window destroy", // EVENT_WINDOW_DESTROY
+ "window maximize", // EVENT_WINDOW_MAXIMIZE
+ "window minimize", // EVENT_WINDOW_MINIMIZE
+ "window resize", // EVENT_WINDOW_RESIZE
+ "window restore", // EVENT_WINDOW_RESTORE
+ "hyperlink end index changed", // EVENT_HYPERLINK_END_INDEX_CHANGED
+ "hyperlink number of anchors changed", // EVENT_HYPERLINK_NUMBER_OF_ANCHORS_CHANGED
+ "hyperlink selected link changed", // EVENT_HYPERLINK_SELECTED_LINK_CHANGED
+ "hypertext link activated", // EVENT_HYPERTEXT_LINK_ACTIVATED
+ "hypertext link selected", // EVENT_HYPERTEXT_LINK_SELECTED
+ "hyperlink start index changed", // EVENT_HYPERLINK_START_INDEX_CHANGED
+ "hypertext changed", // EVENT_HYPERTEXT_CHANGED
+ "hypertext links count changed", // EVENT_HYPERTEXT_NLINKS_CHANGED
+ "object attribute changed", // EVENT_OBJECT_ATTRIBUTE_CHANGED
+ "virtual cursor changed", // EVENT_VIRTUALCURSOR_CHANGED
+ "text value change", // EVENT_TEXT_VALUE_CHANGE
+ "scrolling", // EVENT_SCROLLING
+ "announcement", // EVENT_ANNOUNCEMENT
+ "live region added", // EVENT_LIVE_REGION_ADDED
+ "live region removed", // EVENT_LIVE_REGION_REMOVED
+ "inner reorder", // EVENT_INNER_REORDER
+};
+
+#endif