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gecko-dev/accessible/mac/AccessibleWrap.mm

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/* clang-format off */
/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* clang-format on */
/* 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/. */
#include "DocAccessibleWrap.h"
#include "nsObjCExceptions.h"
#include "nsCocoaUtils.h"
#include "nsUnicharUtils.h"
#include "LocalAccessible-inl.h"
#include "nsAccUtils.h"
#include "Role.h"
#include "TextRange.h"
#include "gfxPlatform.h"
#import "MOXLandmarkAccessibles.h"
#import "MOXMathAccessibles.h"
#import "MOXTextMarkerDelegate.h"
#import "MOXWebAreaAccessible.h"
#import "mozAccessible.h"
#import "mozActionElements.h"
#import "mozHTMLAccessible.h"
#import "mozSelectableElements.h"
#import "mozTableAccessible.h"
#import "mozTextAccessible.h"
using namespace mozilla;
using namespace mozilla::a11y;
AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
: LocalAccessible(aContent, aDoc),
mNativeObject(nil),
mNativeInited(false) {
if (aContent && aContent->IsElement() && aDoc) {
// Check if this accessible is a live region and queue it
// it for dispatching an event after it has been inserted.
DocAccessibleWrap* doc = static_cast<DocAccessibleWrap*>(aDoc);
static const dom::Element::AttrValuesArray sLiveRegionValues[] = {
nsGkAtoms::OFF, nsGkAtoms::polite, nsGkAtoms::assertive, nullptr};
int32_t attrValue = aContent->AsElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::aria_live, sLiveRegionValues,
eIgnoreCase);
if (attrValue == 0) {
// aria-live is "off", do nothing.
} else if (attrValue > 0) {
// aria-live attribute is polite or assertive. It's live!
doc->QueueNewLiveRegion(this);
} else if (const nsRoleMapEntry* roleMap =
aria::GetRoleMap(aContent->AsElement())) {
// aria role defines it as a live region. It's live!
if (roleMap->liveAttRule == ePoliteLiveAttr ||
roleMap->liveAttRule == eAssertiveLiveAttr) {
doc->QueueNewLiveRegion(this);
}
} else if (nsStaticAtom* value = GetAccService()->MarkupAttribute(
aContent, nsGkAtoms::aria_live)) {
// HTML element defines it as a live region. It's live!
if (value == nsGkAtoms::polite || value == nsGkAtoms::assertive) {
doc->QueueNewLiveRegion(this);
}
}
}
}
AccessibleWrap::~AccessibleWrap() {}
mozAccessible* AccessibleWrap::GetNativeObject() {
NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
if (!mNativeInited && !mNativeObject) {
// We don't creat OSX accessibles for xul tooltips, defunct accessibles,
// <br> (whitespace) elements, or pruned children.
//
// To maintain a scripting environment where the XPCOM accessible hierarchy
// look the same on all platforms, we still let the C++ objects be created
// though.
if (!IsXULTooltip() && !IsDefunct() && Role() != roles::WHITESPACE) {
mNativeObject = [[GetNativeType() alloc] initWithAccessible:this];
}
}
mNativeInited = true;
return mNativeObject;
NS_OBJC_END_TRY_BLOCK_RETURN(nil);
}
void AccessibleWrap::GetNativeInterface(void** aOutInterface) {
*aOutInterface = static_cast<void*>(GetNativeObject());
}
// overridden in subclasses to create the right kind of object. by default we
// create a generic 'mozAccessible' node.
Class AccessibleWrap::GetNativeType() {
NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
if (IsXULTabpanels()) {
return [mozPaneAccessible class];
}
if (IsTable()) {
return [mozTableAccessible class];
}
if (IsTableRow()) {
return [mozTableRowAccessible class];
}
if (IsTableCell()) {
return [mozTableCellAccessible class];
}
if (IsDoc()) {
return [MOXWebAreaAccessible class];
}
return GetTypeFromRole(Role());
NS_OBJC_END_TRY_BLOCK_RETURN(nil);
}
// this method is very important. it is fired when an accessible object "dies".
// after this point the object might still be around (because some 3rd party
// still has a ref to it), but it is in fact 'dead'.
void AccessibleWrap::Shutdown() {
// this ensure we will not try to re-create the native object.
mNativeInited = true;
// we really intend to access the member directly.
if (mNativeObject) {
[mNativeObject expire];
[mNativeObject release];
mNativeObject = nil;
}
LocalAccessible::Shutdown();
}
nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
nsresult rv = LocalAccessible::HandleAccEvent(aEvent);
NS_ENSURE_SUCCESS(rv, rv);
if (IsDefunct()) {
// The accessible can become defunct after their events are handled.
return NS_OK;
}
uint32_t eventType = aEvent->GetEventType();
if (eventType == nsIAccessibleEvent::EVENT_SHOW) {
DocAccessibleWrap* doc = static_cast<DocAccessibleWrap*>(Document());
doc->ProcessNewLiveRegions();
}
if (IPCAccessibilityActive()) {
return NS_OK;
}
LocalAccessible* eventTarget = nullptr;
switch (eventType) {
case nsIAccessibleEvent::EVENT_SELECTION:
case nsIAccessibleEvent::EVENT_SELECTION_ADD:
case nsIAccessibleEvent::EVENT_SELECTION_REMOVE: {
AccSelChangeEvent* selEvent = downcast_accEvent(aEvent);
// The "widget" is the selected widget's container. In OSX
// it is the target of the selection changed event.
eventTarget = selEvent->Widget();
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
LocalAccessible* acc = aEvent->GetAccessible();
// If there is a text input ancestor, use it as the event source.
while (acc && GetTypeFromRole(acc->Role()) != [mozTextAccessible class]) {
acc = acc->LocalParent();
}
eventTarget = acc ? acc : aEvent->GetAccessible();
break;
}
default:
eventTarget = aEvent->GetAccessible();
break;
}
mozAccessible* nativeAcc = nil;
eventTarget->GetNativeInterface((void**)&nativeAcc);
if (!nativeAcc) {
return NS_ERROR_FAILURE;
}
switch (eventType) {
case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
AccStateChangeEvent* event = downcast_accEvent(aEvent);
[nativeAcc stateChanged:event->GetState()
isEnabled:event->IsStateEnabled()];
break;
}
case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED: {
MOXTextMarkerDelegate* delegate =
[MOXTextMarkerDelegate getOrCreateForDoc:aEvent->Document()];
AccTextSelChangeEvent* event = downcast_accEvent(aEvent);
AutoTArray<TextRange, 1> ranges;
event->SelectionRanges(&ranges);
if (ranges.Length()) {
// Cache selection in delegate.
[delegate setSelectionFrom:ranges[0].StartContainer()
at:ranges[0].StartOffset()
to:ranges[0].EndContainer()
at:ranges[0].EndOffset()];
}
[nativeAcc handleAccessibleEvent:eventType];
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
AccCaretMoveEvent* event = downcast_accEvent(aEvent);
int32_t caretOffset = event->GetCaretOffset();
MOXTextMarkerDelegate* delegate =
[MOXTextMarkerDelegate getOrCreateForDoc:aEvent->Document()];
[delegate setCaretOffset:eventTarget
at:caretOffset
moveGranularity:event->GetGranularity()];
if (event->IsSelectionCollapsed()) {
// If the selection is collapsed, invalidate our text selection cache.
[delegate setSelectionFrom:eventTarget
at:caretOffset
to:eventTarget
at:caretOffset];
}
if (mozTextAccessible* textAcc = static_cast<mozTextAccessible*>(
[nativeAcc moxEditableAncestor])) {
[textAcc
handleAccessibleEvent:nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED];
} else {
[nativeAcc
handleAccessibleEvent:nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED];
}
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
AccTextChangeEvent* tcEvent = downcast_accEvent(aEvent);
[nativeAcc handleAccessibleTextChangeEvent:nsCocoaUtils::ToNSString(
tcEvent->ModifiedText())
inserted:tcEvent->IsTextInserted()
inContainer:aEvent->GetAccessible()
at:tcEvent->GetStartOffset()];
break;
}
case nsIAccessibleEvent::EVENT_ALERT:
case nsIAccessibleEvent::EVENT_FOCUS:
case nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE:
case nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE:
case nsIAccessibleEvent::EVENT_MENUPOPUP_START:
case nsIAccessibleEvent::EVENT_MENUPOPUP_END:
case nsIAccessibleEvent::EVENT_REORDER:
case nsIAccessibleEvent::EVENT_SELECTION:
case nsIAccessibleEvent::EVENT_SELECTION_ADD:
case nsIAccessibleEvent::EVENT_SELECTION_REMOVE:
case nsIAccessibleEvent::EVENT_LIVE_REGION_ADDED:
case nsIAccessibleEvent::EVENT_LIVE_REGION_REMOVED:
case nsIAccessibleEvent::EVENT_NAME_CHANGE:
case nsIAccessibleEvent::EVENT_OBJECT_ATTRIBUTE_CHANGED:
case nsIAccessibleEvent::EVENT_TABLE_STYLING_CHANGED:
[nativeAcc handleAccessibleEvent:eventType];
break;
default:
break;
}
return NS_OK;
NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
}
bool AccessibleWrap::ApplyPostFilter(const EWhichPostFilter& aSearchKey,
const nsString& aSearchText) {
// We currently only support the eContainsText post filter.
MOZ_ASSERT(aSearchKey == EWhichPostFilter::eContainsText,
"Only search text supported");
nsAutoString name;
Name(name);
return CaseInsensitiveFindInReadable(aSearchText, name);
}
////////////////////////////////////////////////////////////////////////////////
// AccessibleWrap protected
Class a11y::GetTypeFromRole(roles::Role aRole) {
NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
switch (aRole) {
case roles::COMBOBOX:
return [mozPopupButtonAccessible class];
case roles::PUSHBUTTON:
return [mozButtonAccessible class];
case roles::PAGETAB:
return [mozTabAccessible class];
case roles::CHECKBUTTON:
case roles::TOGGLE_BUTTON:
case roles::SWITCH:
return [mozCheckboxAccessible class];
case roles::RADIOBUTTON:
return [mozRadioButtonAccessible class];
case roles::SPINBUTTON:
case roles::SLIDER:
return [mozIncrementableAccessible class];
case roles::HEADING:
return [mozHeadingAccessible class];
case roles::PAGETABLIST:
return [mozTabGroupAccessible class];
case roles::ENTRY:
case roles::CAPTION:
case roles::ACCEL_LABEL:
case roles::EDITCOMBOBOX:
case roles::PASSWORD_TEXT:
// normal textfield (static or editable)
return [mozTextAccessible class];
case roles::TEXT_LEAF:
case roles::STATICTEXT:
return [mozTextLeafAccessible class];
case roles::LANDMARK:
return [MOXLandmarkAccessible class];
case roles::LINK:
return [mozLinkAccessible class];
case roles::LISTBOX:
return [mozListboxAccessible class];
case roles::LISTITEM:
return [MOXListItemAccessible class];
case roles::OPTION: {
return [mozOptionAccessible class];
}
case roles::RICH_OPTION: {
return [mozSelectableChildAccessible class];
}
case roles::COMBOBOX_LIST:
case roles::MENUBAR:
case roles::MENUPOPUP: {
return [mozMenuAccessible class];
}
case roles::COMBOBOX_OPTION:
case roles::PARENT_MENUITEM:
case roles::MENUITEM: {
return [mozMenuItemAccessible class];
}
case roles::MATHML_ROOT:
return [MOXMathRootAccessible class];
case roles::MATHML_SQUARE_ROOT:
return [MOXMathSquareRootAccessible class];
case roles::MATHML_FRACTION:
return [MOXMathFractionAccessible class];
case roles::MATHML_SUB:
case roles::MATHML_SUP:
case roles::MATHML_SUB_SUP:
return [MOXMathSubSupAccessible class];
case roles::MATHML_UNDER:
case roles::MATHML_OVER:
case roles::MATHML_UNDER_OVER:
return [MOXMathUnderOverAccessible class];
case roles::OUTLINE:
case roles::TREE_TABLE:
return [mozOutlineAccessible class];
case roles::OUTLINEITEM:
return [mozOutlineRowAccessible class];
default:
return [mozAccessible class];
}
return nil;
NS_OBJC_END_TRY_BLOCK_RETURN(nil);
}
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