зеркало из https://github.com/mozilla/gecko-dev.git
531 строка
19 KiB
C++
531 строка
19 KiB
C++
/* -*- 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;
|
|
|
|
namespace dom {
|
|
class DOMStringList;
|
|
class Element;
|
|
} // namespace dom
|
|
|
|
namespace a11y {
|
|
|
|
class AccAttributes;
|
|
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 deck panel is
|
|
* switched.
|
|
*/
|
|
void DeckPanelSwitched(mozilla::PresShell* aPresShell, nsIContent* aDeckNode,
|
|
nsIFrame* aPrevBoxFrame, nsIFrame* aCurrentBoxFrame);
|
|
|
|
/**
|
|
* 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 NotifyOfResolutionChange(mozilla::PresShell* aPresShell,
|
|
float aResolution);
|
|
|
|
// nsAccessibiltiyService
|
|
|
|
/**
|
|
* Return true if accessibility service has been shutdown.
|
|
*/
|
|
static bool IsShutdown() { return gConsumers == 0; };
|
|
|
|
/**
|
|
* 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 =
|
|
GetMarkupMapInfoForNode(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.
|
|
*/
|
|
nsStaticAtom* MarkupAttribute(const nsIContent* aContent,
|
|
nsStaticAtom* aAtom) const {
|
|
const mozilla::a11y::MarkupMapInfo* markupMap =
|
|
GetMarkupMapInfoForNode(aContent);
|
|
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(const nsIContent* aContent,
|
|
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,
|
|
};
|
|
|
|
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* GetMarkupMapInfoForNode(
|
|
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;
|
|
}
|
|
|
|
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
|
|
"table styling changed", // EVENT_TABLE_STYLING_CHANGED
|
|
"inner reorder", // EVENT_INNER_REORDER
|
|
};
|
|
|
|
#endif
|