| /* |
| * Copyright (C) 2012, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/modules/accessibility/ax_node_object.h" |
| |
| #include <math.h> |
| |
| #include "third_party/blink/renderer/core/dom/accessible_node.h" |
| #include "third_party/blink/renderer/core/dom/element.h" |
| #include "third_party/blink/renderer/core/dom/flat_tree_traversal.h" |
| #include "third_party/blink/renderer/core/dom/node_traversal.h" |
| #include "third_party/blink/renderer/core/dom/qualified_name.h" |
| #include "third_party/blink/renderer/core/dom/shadow_root.h" |
| #include "third_party/blink/renderer/core/dom/text.h" |
| #include "third_party/blink/renderer/core/dom/user_gesture_indicator.h" |
| #include "third_party/blink/renderer/core/editing/editing_utilities.h" |
| #include "third_party/blink/renderer/core/editing/markers/document_marker_controller.h" |
| #include "third_party/blink/renderer/core/frame/local_frame_view.h" |
| #include "third_party/blink/renderer/core/html/forms/html_field_set_element.h" |
| #include "third_party/blink/renderer/core/html/forms/html_input_element.h" |
| #include "third_party/blink/renderer/core/html/forms/html_label_element.h" |
| #include "third_party/blink/renderer/core/html/forms/html_legend_element.h" |
| #include "third_party/blink/renderer/core/html/forms/html_select_element.h" |
| #include "third_party/blink/renderer/core/html/forms/html_text_area_element.h" |
| #include "third_party/blink/renderer/core/html/forms/labels_node_list.h" |
| #include "third_party/blink/renderer/core/html/forms/radio_input_type.h" |
| #include "third_party/blink/renderer/core/html/forms/text_control_element.h" |
| #include "third_party/blink/renderer/core/html/html_anchor_element.h" |
| #include "third_party/blink/renderer/core/html/html_div_element.h" |
| #include "third_party/blink/renderer/core/html/html_dlist_element.h" |
| #include "third_party/blink/renderer/core/html/html_frame_element_base.h" |
| #include "third_party/blink/renderer/core/html/html_image_element.h" |
| #include "third_party/blink/renderer/core/html/html_meter_element.h" |
| #include "third_party/blink/renderer/core/html/html_plugin_element.h" |
| #include "third_party/blink/renderer/core/html/html_table_caption_element.h" |
| #include "third_party/blink/renderer/core/html/html_table_cell_element.h" |
| #include "third_party/blink/renderer/core/html/html_table_element.h" |
| #include "third_party/blink/renderer/core/html/html_table_row_element.h" |
| #include "third_party/blink/renderer/core/html/html_table_section_element.h" |
| #include "third_party/blink/renderer/core/html/media/html_media_element.h" |
| #include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h" |
| #include "third_party/blink/renderer/core/input_type_names.h" |
| #include "third_party/blink/renderer/core/layout/layout_block_flow.h" |
| #include "third_party/blink/renderer/core/layout/layout_object.h" |
| #include "third_party/blink/renderer/core/svg/svg_element.h" |
| #include "third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.h" |
| #include "third_party/blink/renderer/modules/accessibility/ax_position.h" |
| #include "third_party/blink/renderer/modules/accessibility/ax_range.h" |
| #include "third_party/blink/renderer/modules/media_controls/elements/media_control_elements_helper.h" |
| #include "third_party/blink/renderer/platform/text/platform_locale.h" |
| #include "third_party/blink/renderer/platform/weborigin/kurl.h" |
| #include "third_party/blink/renderer/platform/wtf/text/string_builder.h" |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| // In ARIA 1.1, default value of aria-level was changed to 2. |
| const int kDefaultHeadingLevel = 2; |
| |
| AXNodeObject::AXNodeObject(Node* node, AXObjectCacheImpl& ax_object_cache) |
| : AXObject(ax_object_cache), |
| children_dirty_(false), |
| node_(node) {} |
| |
| AXNodeObject* AXNodeObject::Create(Node* node, |
| AXObjectCacheImpl& ax_object_cache) { |
| return new AXNodeObject(node, ax_object_cache); |
| } |
| |
| AXNodeObject::~AXNodeObject() { |
| DCHECK(!node_); |
| } |
| |
| void AXNodeObject::AlterSliderOrSpinButtonValue(bool increase) { |
| if (!IsSlider() && !IsSpinButton()) |
| return; |
| |
| float value; |
| if (!ValueForRange(&value)) |
| return; |
| |
| float step; |
| StepValueForRange(&step); |
| |
| value += increase ? step : -step; |
| |
| OnNativeSetValueAction(String::Number(value)); |
| AXObjectCache().PostNotification(GetNode(), |
| AXObjectCacheImpl::kAXValueChanged); |
| } |
| |
| AXObject* AXNodeObject::ActiveDescendant() { |
| Element* element = GetElement(); |
| if (!element) |
| return nullptr; |
| |
| Element* descendant = |
| GetAOMPropertyOrARIAAttribute(AOMRelationProperty::kActiveDescendant); |
| if (!descendant) |
| return nullptr; |
| |
| AXObject* ax_descendant = AXObjectCache().GetOrCreate(descendant); |
| return ax_descendant; |
| } |
| |
| bool AXNodeObject::ComputeAccessibilityIsIgnored( |
| IgnoredReasons* ignored_reasons) const { |
| #if DCHECK_IS_ON() |
| // Double-check that an AXObject is never accessed before |
| // it's been initialized. |
| DCHECK(initialized_); |
| #endif |
| |
| // If this element is within a parent that cannot have children, it should not |
| // be exposed. |
| if (IsDescendantOfLeafNode()) { |
| if (ignored_reasons) |
| ignored_reasons->push_back( |
| IgnoredReason(kAXAncestorIsLeafNode, LeafNodeAncestor())); |
| return true; |
| } |
| |
| // Ignore labels that are already referenced by a control. |
| AXObject* control_object = CorrespondingControlForLabelElement(); |
| if (control_object && control_object->IsCheckboxOrRadio() && |
| control_object->NameFromLabelElement()) { |
| if (ignored_reasons) { |
| HTMLLabelElement* label = LabelElementContainer(); |
| if (label && label != GetNode()) { |
| AXObject* label_ax_object = AXObjectCache().GetOrCreate(label); |
| ignored_reasons->push_back( |
| IgnoredReason(kAXLabelContainer, label_ax_object)); |
| } |
| |
| ignored_reasons->push_back(IgnoredReason(kAXLabelFor, control_object)); |
| } |
| return true; |
| } |
| |
| Element* element = GetNode()->IsElementNode() ? ToElement(GetNode()) |
| : GetNode()->parentElement(); |
| if (!GetLayoutObject() && (!element || !element->IsInCanvasSubtree()) && |
| !AOMPropertyOrARIAAttributeIsFalse(AOMBooleanProperty::kHidden)) { |
| if (ignored_reasons) |
| ignored_reasons->push_back(IgnoredReason(kAXNotRendered)); |
| return true; |
| } |
| |
| if (role_ == kUnknownRole) { |
| if (ignored_reasons) |
| ignored_reasons->push_back(IgnoredReason(kAXUninteresting)); |
| return true; |
| } |
| return false; |
| } |
| |
| static bool IsListElement(Node* node) { |
| return IsHTMLUListElement(*node) || IsHTMLOListElement(*node) || |
| IsHTMLDListElement(*node); |
| } |
| |
| static bool IsRequiredOwnedElement(AXObject* parent, |
| AccessibilityRole current_role, |
| HTMLElement* current_element) { |
| Node* parent_node = parent->GetNode(); |
| if (!parent_node || !parent_node->IsHTMLElement()) |
| return false; |
| |
| if (current_role == kListItemRole) |
| return IsListElement(parent_node); |
| if (current_role == kListMarkerRole) |
| return IsHTMLLIElement(*parent_node); |
| if (current_role == kMenuItemCheckBoxRole || current_role == kMenuItemRole || |
| current_role == kMenuItemRadioRole) |
| return IsHTMLMenuElement(*parent_node); |
| |
| if (!current_element) |
| return false; |
| if (IsHTMLTableCellElement(*current_element)) |
| return IsHTMLTableRowElement(*parent_node); |
| if (IsHTMLTableRowElement(*current_element)) |
| return IsHTMLTableSectionElement(ToHTMLElement(*parent_node)); |
| |
| // In case of ListboxRole and its child, ListBoxOptionRole, inheritance of |
| // presentation role is handled in AXListBoxOption because ListBoxOption Role |
| // doesn't have any child. |
| // If it's just ignored because of presentation, we can't see any AX tree |
| // related to ListBoxOption. |
| return false; |
| } |
| |
| const AXObject* AXNodeObject::InheritsPresentationalRoleFrom() const { |
| // ARIA states if an item can get focus, it should not be presentational. |
| if (CanSetFocusAttribute()) |
| return nullptr; |
| |
| if (IsPresentational()) |
| return this; |
| |
| // http://www.w3.org/TR/wai-aria/complete#presentation |
| // ARIA spec says that the user agent MUST apply an inherited role of |
| // presentation |
| // to any owned elements that do not have an explicit role defined. |
| if (AriaRoleAttribute() != kUnknownRole) |
| return nullptr; |
| |
| AXObject* parent = ParentObject(); |
| if (!parent) |
| return nullptr; |
| |
| HTMLElement* element = nullptr; |
| if (GetNode() && GetNode()->IsHTMLElement()) |
| element = ToHTMLElement(GetNode()); |
| if (!parent->HasInheritedPresentationalRole()) |
| return nullptr; |
| |
| // ARIA spec says that when a parent object is presentational and this object |
| // is a required owned element of that parent, then this object is also |
| // presentational. |
| if (IsRequiredOwnedElement(parent, RoleValue(), element)) |
| return parent; |
| return nullptr; |
| } |
| |
| // There should only be one banner/contentInfo per page. If header/footer are |
| // being used within an article, aside, nave, section, blockquote, details, |
| // fieldset, figure, td, or main, then it should not be exposed as whole |
| // page's banner/contentInfo. |
| static HashSet<QualifiedName>& GetLandmarkRolesNotAllowed() { |
| DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, landmark_roles_not_allowed, ()); |
| if (landmark_roles_not_allowed.IsEmpty()) { |
| landmark_roles_not_allowed.insert(articleTag); |
| landmark_roles_not_allowed.insert(asideTag); |
| landmark_roles_not_allowed.insert(navTag); |
| landmark_roles_not_allowed.insert(sectionTag); |
| landmark_roles_not_allowed.insert(blockquoteTag); |
| landmark_roles_not_allowed.insert(detailsTag); |
| landmark_roles_not_allowed.insert(fieldsetTag); |
| landmark_roles_not_allowed.insert(figureTag); |
| landmark_roles_not_allowed.insert(tdTag); |
| landmark_roles_not_allowed.insert(mainTag); |
| } |
| return landmark_roles_not_allowed; |
| } |
| |
| bool AXNodeObject::IsDescendantOfElementType( |
| HashSet<QualifiedName>& tag_names) const { |
| if (!GetNode()) |
| return false; |
| |
| for (Element* parent = GetNode()->parentElement(); parent; |
| parent = parent->parentElement()) { |
| if (tag_names.Contains(parent->TagQName())) |
| return true; |
| } |
| return false; |
| } |
| |
| AccessibilityRole AXNodeObject::NativeAccessibilityRoleIgnoringAria() const { |
| if (!GetNode()) |
| return kUnknownRole; |
| |
| // |HTMLAnchorElement| sets isLink only when it has hrefAttr. |
| if (GetNode()->IsLink()) |
| return kLinkRole; |
| |
| if (IsHTMLAnchorElement(*GetNode())) { |
| // We assume that an anchor element is LinkRole if it has event listners |
| // even though it doesn't have hrefAttr. |
| if (IsClickable()) |
| return kLinkRole; |
| return kAnchorRole; |
| } |
| |
| if (IsHTMLButtonElement(*GetNode())) |
| return ButtonRoleType(); |
| |
| if (IsHTMLDetailsElement(*GetNode())) |
| return kDetailsRole; |
| |
| if (IsHTMLSummaryElement(*GetNode())) { |
| ContainerNode* parent = FlatTreeTraversal::Parent(*GetNode()); |
| if (parent && IsHTMLSlotElement(parent)) |
| parent = FlatTreeTraversal::Parent(*parent); |
| if (parent && IsHTMLDetailsElement(parent)) |
| return kDisclosureTriangleRole; |
| return kUnknownRole; |
| } |
| |
| if (auto* input = ToHTMLInputElementOrNull(*GetNode())) { |
| const AtomicString& type = input->type(); |
| if (input->DataList()) |
| return kTextFieldWithComboBoxRole; |
| if (type == InputTypeNames::button) { |
| if ((GetNode()->parentNode() && |
| IsHTMLMenuElement(GetNode()->parentNode())) || |
| (ParentObject() && ParentObject()->RoleValue() == kMenuRole)) |
| return kMenuItemRole; |
| return ButtonRoleType(); |
| } |
| if (type == InputTypeNames::checkbox) { |
| if ((GetNode()->parentNode() && |
| IsHTMLMenuElement(GetNode()->parentNode())) || |
| (ParentObject() && ParentObject()->RoleValue() == kMenuRole)) |
| return kMenuItemCheckBoxRole; |
| return kCheckBoxRole; |
| } |
| if (type == InputTypeNames::date) |
| return kDateRole; |
| if (type == InputTypeNames::datetime || |
| type == InputTypeNames::datetime_local || |
| type == InputTypeNames::month || type == InputTypeNames::week) |
| return kDateTimeRole; |
| if (type == InputTypeNames::file) |
| return kButtonRole; |
| if (type == InputTypeNames::radio) { |
| if ((GetNode()->parentNode() && |
| IsHTMLMenuElement(GetNode()->parentNode())) || |
| (ParentObject() && ParentObject()->RoleValue() == kMenuRole)) |
| return kMenuItemRadioRole; |
| return kRadioButtonRole; |
| } |
| if (type == InputTypeNames::number) |
| return kSpinButtonRole; |
| if (input->IsTextButton()) |
| return ButtonRoleType(); |
| if (type == InputTypeNames::range) |
| return kSliderRole; |
| if (type == InputTypeNames::color) |
| return kColorWellRole; |
| if (type == InputTypeNames::time) |
| return kInputTimeRole; |
| return kTextFieldRole; |
| } |
| |
| if (auto* select_element = ToHTMLSelectElementOrNull(*GetNode())) |
| return select_element->IsMultiple() ? kListBoxRole : kPopUpButtonRole; |
| |
| if (auto* option = ToHTMLOptionElementOrNull(*GetNode())) { |
| HTMLSelectElement* select_element = option->OwnerSelectElement(); |
| return !select_element || select_element->IsMultiple() |
| ? kListBoxOptionRole |
| : kMenuListOptionRole; |
| } |
| |
| if (IsHTMLTextAreaElement(*GetNode())) |
| return kTextFieldRole; |
| |
| if (HeadingLevel()) |
| return kHeadingRole; |
| |
| if (IsHTMLDivElement(*GetNode())) |
| return kGenericContainerRole; |
| |
| if (IsHTMLMeterElement(*GetNode())) |
| return kMeterRole; |
| |
| if (IsHTMLProgressElement(*GetNode())) |
| return kProgressIndicatorRole; |
| |
| if (IsHTMLOutputElement(*GetNode())) |
| return kStatusRole; |
| |
| if (IsHTMLParagraphElement(*GetNode())) |
| return kParagraphRole; |
| |
| if (IsHTMLLabelElement(*GetNode())) |
| return kLabelRole; |
| |
| if (IsHTMLLegendElement(*GetNode())) |
| return kLegendRole; |
| |
| if (IsHTMLRubyElement(*GetNode())) |
| return kRubyRole; |
| |
| if (IsHTMLDListElement(*GetNode())) |
| return kDescriptionListRole; |
| |
| if (IsHTMLAudioElement(*GetNode())) |
| return kAudioRole; |
| if (IsHTMLVideoElement(*GetNode())) |
| return kVideoRole; |
| |
| if (GetNode()->HasTagName(ddTag)) |
| return kDescriptionListDetailRole; |
| |
| if (GetNode()->HasTagName(dtTag)) |
| return kDescriptionListTermRole; |
| |
| if (GetNode()->nodeName() == "math") |
| return kMathRole; |
| |
| if (GetNode()->HasTagName(rpTag) || GetNode()->HasTagName(rtTag)) |
| return kAnnotationRole; |
| |
| if (IsHTMLFormElement(*GetNode())) |
| return kFormRole; |
| |
| if (GetNode()->HasTagName(abbrTag)) |
| return kAbbrRole; |
| |
| if (GetNode()->HasTagName(articleTag)) |
| return kArticleRole; |
| |
| if (GetNode()->HasTagName(delTag)) |
| return kContentDeletionRole; |
| |
| if (GetNode()->HasTagName(insTag)) |
| return kContentInsertionRole; |
| |
| if (GetNode()->HasTagName(mainTag)) |
| return kMainRole; |
| |
| if (GetNode()->HasTagName(markTag)) |
| return kMarkRole; |
| |
| if (GetNode()->HasTagName(navTag)) |
| return kNavigationRole; |
| |
| if (GetNode()->HasTagName(asideTag)) |
| return kComplementaryRole; |
| |
| if (GetNode()->HasTagName(preTag)) |
| return kPreRole; |
| |
| if (GetNode()->HasTagName(sectionTag)) |
| return kRegionRole; |
| |
| if (GetNode()->HasTagName(addressTag)) |
| return kContentInfoRole; |
| |
| if (IsHTMLDialogElement(*GetNode())) |
| return kDialogRole; |
| |
| // The HTML element should not be exposed as an element. That's what the |
| // LayoutView element does. |
| if (IsHTMLHtmlElement(*GetNode())) |
| return kIgnoredRole; |
| |
| if (IsHTMLIFrameElement(*GetNode())) { |
| const AtomicString& aria_role = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kRole); |
| if (aria_role == "none" || aria_role == "presentation") |
| return kIframePresentationalRole; |
| return kIframeRole; |
| } |
| |
| // There should only be one banner/contentInfo per page. If header/footer are |
| // being used within an article or section then it should not be exposed as |
| // whole page's banner/contentInfo but as a generic container role. |
| if (GetNode()->HasTagName(headerTag)) { |
| if (IsDescendantOfElementType(GetLandmarkRolesNotAllowed())) |
| return kGenericContainerRole; |
| return kBannerRole; |
| } |
| |
| if (GetNode()->HasTagName(footerTag)) { |
| if (IsDescendantOfElementType(GetLandmarkRolesNotAllowed())) |
| return kGenericContainerRole; |
| return kFooterRole; |
| } |
| |
| if (GetNode()->HasTagName(blockquoteTag)) |
| return kBlockquoteRole; |
| |
| if (GetNode()->HasTagName(captionTag)) |
| return kCaptionRole; |
| |
| if (GetNode()->HasTagName(figcaptionTag)) |
| return kFigcaptionRole; |
| |
| if (GetNode()->HasTagName(figureTag)) |
| return kFigureRole; |
| |
| if (GetNode()->nodeName() == "TIME") |
| return kTimeRole; |
| |
| if (IsEmbeddedObject()) |
| return kEmbeddedObjectRole; |
| |
| if (IsHTMLHRElement(*GetNode())) |
| return kSplitterRole; |
| |
| if (IsFieldset()) |
| return kGroupRole; |
| |
| return kUnknownRole; |
| } |
| |
| AccessibilityRole AXNodeObject::DetermineAccessibilityRole() { |
| if (!GetNode()) |
| return kUnknownRole; |
| |
| if ((aria_role_ = DetermineAriaRoleAttribute()) != kUnknownRole) |
| return aria_role_; |
| if (GetNode()->IsTextNode()) |
| return kStaticTextRole; |
| |
| AccessibilityRole role = NativeAccessibilityRoleIgnoringAria(); |
| return role == kUnknownRole ? kGenericContainerRole : role; |
| } |
| |
| void AXNodeObject::AccessibilityChildrenFromAOMProperty( |
| AOMRelationListProperty property, |
| AXObject::AXObjectVector& children) const { |
| HeapVector<Member<Element>> elements; |
| if (!HasAOMPropertyOrARIAAttribute(property, elements)) |
| return; |
| |
| AXObjectCacheImpl& cache = AXObjectCache(); |
| for (const auto& element : elements) { |
| if (AXObject* child = cache.GetOrCreate(element)) { |
| // Only aria-labelledby and aria-describedby can target hidden elements. |
| if (child->AccessibilityIsIgnored() && |
| property != AOMRelationListProperty::kLabeledBy && |
| property != AOMRelationListProperty::kDescribedBy) { |
| continue; |
| } |
| children.push_back(child); |
| } |
| } |
| } |
| |
| bool AXNodeObject::IsMultiline() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return false; |
| |
| const AccessibilityRole role = RoleValue(); |
| const bool is_edit_box = role == kSearchBoxRole || role == kTextFieldRole; |
| if (!IsEditable() && !is_edit_box) |
| return false; // Doesn't support multiline. |
| |
| // Supports aria-multiline, so check for attribute. |
| bool is_multiline = false; |
| if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kMultiline, |
| is_multiline)) { |
| return is_multiline; |
| } |
| |
| // Default for <textarea> is true. |
| if (IsHTMLTextAreaElement(*node)) |
| return true; |
| |
| // Default for other edit boxes is false, including for ARIA, says CORE-AAM. |
| if (is_edit_box) |
| return false; |
| |
| // If root of contenteditable area and no ARIA role of textbox/searchbox used, |
| // default to multiline=true which is what the default behavior is. |
| return HasContentEditableAttributeSet(); |
| } |
| |
| // This only returns true if this is the element that actually has the |
| // contentEditable attribute set, unlike node->hasEditableStyle() which will |
| // also return true if an ancestor is editable. |
| bool AXNodeObject::HasContentEditableAttributeSet() const { |
| const AtomicString& content_editable_value = |
| GetAttribute(contenteditableAttr); |
| if (content_editable_value.IsNull()) |
| return false; |
| // Both "true" (case-insensitive) and the empty string count as true. |
| return content_editable_value.IsEmpty() || |
| EqualIgnoringASCIICase(content_editable_value, "true"); |
| } |
| |
| bool AXNodeObject::IsTextControl() const { |
| if (!GetNode()) |
| return false; |
| |
| if (HasContentEditableAttributeSet()) |
| return true; |
| |
| switch (RoleValue()) { |
| case kTextFieldRole: |
| case kTextFieldWithComboBoxRole: |
| case kSearchBoxRole: |
| return true; |
| case kSpinButtonRole: |
| // When it's a native spin button, it behaves like a text box, i.e. users |
| // can type in it and navigate around using cursors. |
| if (const auto* input = ToHTMLInputElementOrNull(*GetNode())) { |
| return input->IsTextField(); |
| } |
| return false; |
| default: |
| return false; |
| } |
| } |
| |
| AXObject* AXNodeObject::MenuButtonForMenu() const { |
| Element* menu_item = MenuItemElementForMenu(); |
| |
| if (menu_item) { |
| // ARIA just has generic menu items. AppKit needs to know if this is a top |
| // level items like MenuBarButton or MenuBarItem |
| AXObject* menu_item_ax = AXObjectCache().GetOrCreate(menu_item); |
| if (menu_item_ax && menu_item_ax->IsMenuButton()) |
| return menu_item_ax; |
| } |
| return nullptr; |
| } |
| |
| AXObject* AXNodeObject::MenuButtonForMenuIfExists() const { |
| Element* menu_item = MenuItemElementForMenu(); |
| |
| if (menu_item) { |
| // ARIA just has generic menu items. AppKit needs to know if this is a top |
| // level items like MenuBarButton or MenuBarItem |
| AXObject* menu_item_ax = AXObjectCache().Get(menu_item); |
| if (menu_item_ax && menu_item_ax->IsMenuButton()) |
| return menu_item_ax; |
| } |
| return nullptr; |
| } |
| |
| static Element* SiblingWithAriaRole(String role, Node* node) { |
| Node* parent = node->parentNode(); |
| if (!parent) |
| return nullptr; |
| |
| for (Element* sibling = ElementTraversal::FirstChild(*parent); sibling; |
| sibling = ElementTraversal::NextSibling(*sibling)) { |
| const AtomicString& sibling_aria_role = |
| AccessibleNode::GetPropertyOrARIAAttribute(sibling, |
| AOMStringProperty::kRole); |
| if (EqualIgnoringASCIICase(sibling_aria_role, role)) |
| return sibling; |
| } |
| |
| return nullptr; |
| } |
| |
| Element* AXNodeObject::MenuItemElementForMenu() const { |
| if (AriaRoleAttribute() != kMenuRole) |
| return nullptr; |
| |
| return SiblingWithAriaRole("menuitem", GetNode()); |
| } |
| |
| Element* AXNodeObject::MouseButtonListener() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return nullptr; |
| |
| if (!node->IsElementNode()) |
| node = node->parentElement(); |
| |
| if (!node) |
| return nullptr; |
| |
| for (Element* element = ToElement(node); element; |
| element = element->parentElement()) { |
| if (element->HasEventListeners(EventTypeNames::click) || |
| element->HasEventListeners(EventTypeNames::mousedown) || |
| element->HasEventListeners(EventTypeNames::mouseup) || |
| element->HasEventListeners(EventTypeNames::DOMActivate)) |
| return element; |
| } |
| |
| return nullptr; |
| } |
| |
| void AXNodeObject::Init() { |
| #if DCHECK_IS_ON() |
| DCHECK(!initialized_); |
| initialized_ = true; |
| #endif |
| AXObject::Init(); |
| } |
| |
| void AXNodeObject::Detach() { |
| AXObject::Detach(); |
| node_ = nullptr; |
| } |
| |
| bool AXNodeObject::IsAnchor() const { |
| return !IsNativeImage() && IsLink(); |
| } |
| |
| bool AXNodeObject::IsControl() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return false; |
| |
| return ((node->IsElementNode() && ToElement(node)->IsFormControlElement()) || |
| AXObject::IsARIAControl(AriaRoleAttribute())); |
| } |
| |
| bool AXNodeObject::IsControllingVideoElement() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return true; |
| |
| return IsHTMLVideoElement( |
| MediaControlElementsHelper::ToParentMediaElement(node)); |
| } |
| |
| bool AXNodeObject::ComputeIsEditableRoot() const { |
| Node* node = GetNode(); |
| if (!node) |
| return false; |
| if (IsNativeTextControl()) |
| return true; |
| if (IsRootEditableElement(*node)) { |
| // Editable roots created by the user agent are handled by |
| // |IsNativeTextControl| above. |
| ShadowRoot* root = node->ContainingShadowRoot(); |
| return !root || !root->IsUserAgent(); |
| } |
| return false; |
| } |
| |
| bool AXNodeObject::IsEmbeddedObject() const { |
| return IsHTMLPlugInElement(GetNode()); |
| } |
| |
| bool AXNodeObject::IsFieldset() const { |
| return IsHTMLFieldSetElement(GetNode()); |
| } |
| |
| bool AXNodeObject::IsHeading() const { |
| return RoleValue() == kHeadingRole; |
| } |
| |
| bool AXNodeObject::IsHovered() const { |
| if (Node* node = this->GetNode()) |
| return node->IsHovered(); |
| return false; |
| } |
| |
| bool AXNodeObject::IsImage() const { |
| return RoleValue() == kImageRole; |
| } |
| |
| bool AXNodeObject::IsImageButton() const { |
| return IsNativeImage() && IsButton(); |
| } |
| |
| bool AXNodeObject::IsInputImage() const { |
| Node* node = this->GetNode(); |
| if (RoleValue() == kButtonRole && IsHTMLInputElement(node)) |
| return ToHTMLInputElement(*node).type() == InputTypeNames::image; |
| |
| return false; |
| } |
| |
| bool AXNodeObject::IsLink() const { |
| return RoleValue() == kLinkRole; |
| } |
| |
| // It is not easily possible to find out if an element is the target of an |
| // in-page link. |
| // As a workaround, we check if the element is a sectioning element with an ID, |
| // or an anchor with a name. |
| bool AXNodeObject::IsInPageLinkTarget() const { |
| if (!node_ || !node_->IsElementNode()) |
| return false; |
| Element* element = ToElement(node_); |
| // We exclude elements that are in the shadow DOM. |
| if (element->ContainingShadowRoot()) |
| return false; |
| |
| if (auto* anchor = ToHTMLAnchorElementOrNull(element)) { |
| return anchor->HasName() || anchor->HasID(); |
| } |
| |
| if (element->HasID() && (IsLandmarkRelated() || IsHTMLSpanElement(element) || |
| IsHTMLDivElement(element))) { |
| return true; |
| } |
| return false; |
| } |
| |
| bool AXNodeObject::IsMenu() const { |
| return RoleValue() == kMenuRole; |
| } |
| |
| bool AXNodeObject::IsMenuButton() const { |
| return RoleValue() == kMenuButtonRole; |
| } |
| |
| bool AXNodeObject::IsMeter() const { |
| return RoleValue() == kMeterRole; |
| } |
| |
| bool AXNodeObject::IsMultiSelectable() const { |
| switch (RoleValue()) { |
| case kGridRole: |
| case kTreeGridRole: |
| case kTreeRole: |
| case kListBoxRole: |
| case kTabListRole: { |
| bool multiselectable = false; |
| if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kMultiselectable, |
| multiselectable)) { |
| return multiselectable; |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| |
| return IsHTMLSelectElement(GetNode()) && |
| ToHTMLSelectElement(*GetNode()).IsMultiple(); |
| } |
| |
| bool AXNodeObject::IsNativeCheckboxOrRadio() const { |
| if (auto* input = ToHTMLInputElementOrNull(GetNode())) { |
| return input->type() == InputTypeNames::checkbox || |
| input->type() == InputTypeNames::radio; |
| } |
| return false; |
| } |
| |
| bool AXNodeObject::IsNativeImage() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return false; |
| |
| if (IsHTMLImageElement(*node)) |
| return true; |
| |
| if (IsHTMLPlugInElement(*node)) |
| return true; |
| |
| if (auto* input = ToHTMLInputElementOrNull(*node)) |
| return input->type() == InputTypeNames::image; |
| |
| return false; |
| } |
| |
| bool AXNodeObject::IsNativeTextControl() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return false; |
| |
| if (IsHTMLTextAreaElement(*node)) |
| return true; |
| |
| if (auto* input = ToHTMLInputElementOrNull(*node)) |
| return input->IsTextField(); |
| |
| return false; |
| } |
| |
| bool AXNodeObject::IsNonNativeTextControl() const { |
| if (IsNativeTextControl()) |
| return false; |
| |
| if (HasContentEditableAttributeSet()) |
| return true; |
| |
| if (IsARIATextControl()) |
| return true; |
| |
| return false; |
| } |
| |
| bool AXNodeObject::IsPasswordField() const { |
| Node* node = this->GetNode(); |
| if (!IsHTMLInputElement(node)) |
| return false; |
| |
| AccessibilityRole aria_role = AriaRoleAttribute(); |
| if (aria_role != kTextFieldRole && aria_role != kUnknownRole) |
| return false; |
| |
| return ToHTMLInputElement(node)->type() == InputTypeNames::password; |
| } |
| |
| bool AXNodeObject::IsProgressIndicator() const { |
| return RoleValue() == kProgressIndicatorRole; |
| } |
| |
| bool AXNodeObject::IsRichlyEditable() const { |
| return HasContentEditableAttributeSet(); |
| } |
| |
| bool AXNodeObject::IsSlider() const { |
| return RoleValue() == kSliderRole; |
| } |
| |
| bool AXNodeObject::IsSpinButton() const { |
| return RoleValue() == kSpinButtonRole; |
| } |
| |
| bool AXNodeObject::IsNativeSlider() const { |
| if (auto* input = ToHTMLInputElementOrNull(GetNode())) |
| return input->type() == InputTypeNames::range; |
| return false; |
| } |
| |
| bool AXNodeObject::IsNativeSpinButton() const { |
| if (auto* input = ToHTMLInputElementOrNull(GetNode())) |
| return input->type() == InputTypeNames::number; |
| return false; |
| } |
| |
| bool AXNodeObject::IsMoveableSplitter() const { |
| return RoleValue() == kSplitterRole && CanSetFocusAttribute(); |
| } |
| |
| bool AXNodeObject::IsClickable() const { |
| Node* node = GetNode(); |
| if (!node) |
| return false; |
| if (node->IsElementNode() && ToElement(node)->IsDisabledFormControl()) { |
| return false; |
| } |
| |
| // Note: we can't call |node->WillRespondToMouseClickEvents()| because that |
| // triggers a style recalc and can delete this. |
| if (node->HasEventListeners(EventTypeNames::mouseup) || |
| node->HasEventListeners(EventTypeNames::mousedown) || |
| node->HasEventListeners(EventTypeNames::click) || |
| node->HasEventListeners(EventTypeNames::DOMActivate)) { |
| return true; |
| } |
| |
| return AXObject::IsClickable(); |
| } |
| |
| AXRestriction AXNodeObject::Restriction() const { |
| Element* elem = GetElement(); |
| if (!elem) |
| return kNone; |
| |
| // An <optgroup> is not exposed directly in the AX tree. |
| if (IsHTMLOptGroupElement(elem)) |
| return kNone; |
| |
| // According to ARIA, all elements of the base markup can be disabled. |
| // According to CORE-AAM, any focusable descendant of aria-disabled |
| // ancestor is also disabled. |
| bool is_disabled; |
| if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kDisabled, |
| is_disabled)) { |
| // Has aria-disabled, overrides native markup determining disabled. |
| if (is_disabled) |
| return kDisabled; |
| } else if (elem->IsDisabledFormControl() || |
| (CanSetFocusAttribute() && IsDescendantOfDisabledNode())) { |
| // No aria-disabled, but other markup says it's disabled. |
| return kDisabled; |
| } |
| |
| // Check aria-readonly if supported by current role. |
| bool is_read_only; |
| if (SupportsARIAReadOnly() && |
| HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kReadOnly, |
| is_read_only)) { |
| // ARIA overrides other readonly state markup. |
| return is_read_only ? kReadOnly : kNone; |
| } |
| |
| // Only editable fields can be marked @readonly (unlike @aria-readonly). |
| if (IsHTMLTextAreaElement(*elem) && ToHTMLTextAreaElement(*elem).IsReadOnly()) |
| return kReadOnly; |
| if (auto* input = ToHTMLInputElementOrNull(*elem)) { |
| if (input->IsTextField() && input->IsReadOnly()) |
| return kReadOnly; |
| } |
| |
| // If a grid cell does not have it's own ARIA input restriction, |
| // fall back on parent grid's readonly state. |
| // See ARIA specification regarding grid/treegrid and readonly. |
| if (IsTableCellLikeRole()) { |
| AXObject* row = ParentObjectUnignored(); |
| if (row->IsTableRowLikeRole()) { |
| AXObject* table = row->ParentObjectUnignored(); |
| if (table->IsTableLikeRole() && (table->RoleValue() == kGridRole || |
| table->RoleValue() == kTreeGridRole)) { |
| if (table->Restriction() == kReadOnly) |
| return kReadOnly; |
| } |
| } |
| } |
| |
| // This is a node that is not readonly and not disabled. |
| return kNone; |
| } |
| |
| AccessibilityExpanded AXNodeObject::IsExpanded() const { |
| if (!SupportsARIAExpanded()) |
| return kExpandedUndefined; |
| |
| if (GetNode() && IsHTMLSummaryElement(*GetNode())) { |
| if (GetNode()->parentNode() && |
| IsHTMLDetailsElement(GetNode()->parentNode())) |
| return ToElement(GetNode()->parentNode())->hasAttribute(openAttr) |
| ? kExpandedExpanded |
| : kExpandedCollapsed; |
| } |
| |
| bool expanded = false; |
| if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kExpanded, expanded)) { |
| return expanded ? kExpandedExpanded : kExpandedCollapsed; |
| } |
| |
| return kExpandedUndefined; |
| } |
| |
| bool AXNodeObject::IsModal() const { |
| if (RoleValue() != kDialogRole && RoleValue() != kAlertDialogRole) |
| return false; |
| |
| bool modal = false; |
| if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kModal, modal)) |
| return modal; |
| |
| if (GetNode() && IsHTMLDialogElement(*GetNode())) |
| return ToElement(GetNode())->IsInTopLayer(); |
| |
| return false; |
| } |
| |
| bool AXNodeObject::IsRequired() const { |
| Node* n = this->GetNode(); |
| if (n && (n->IsElementNode() && ToElement(n)->IsFormControlElement()) && |
| HasAttribute(requiredAttr)) |
| return ToHTMLFormControlElement(n)->IsRequired(); |
| |
| if (AOMPropertyOrARIAAttributeIsTrue(AOMBooleanProperty::kRequired)) |
| return true; |
| |
| return false; |
| } |
| |
| bool AXNodeObject::CanvasHasFallbackContent() const { |
| Node* node = this->GetNode(); |
| if (!IsHTMLCanvasElement(node)) |
| return false; |
| |
| // If it has any children that are elements, we'll assume it might be fallback |
| // content. If it has no children or its only children are not elements |
| // (e.g. just text nodes), it doesn't have fallback content. |
| return ElementTraversal::FirstChild(*node); |
| } |
| |
| int AXNodeObject::HeadingLevel() const { |
| // headings can be in block flow and non-block flow |
| Node* node = this->GetNode(); |
| if (!node) |
| return 0; |
| |
| if (RoleValue() == kHeadingRole) { |
| uint32_t level; |
| if (HasAOMPropertyOrARIAAttribute(AOMUIntProperty::kLevel, level)) { |
| if (level >= 1 && level <= 9) |
| return level; |
| } |
| } |
| |
| if (!node->IsHTMLElement()) |
| return 0; |
| |
| HTMLElement& element = ToHTMLElement(*node); |
| if (element.HasTagName(h1Tag)) |
| return 1; |
| |
| if (element.HasTagName(h2Tag)) |
| return 2; |
| |
| if (element.HasTagName(h3Tag)) |
| return 3; |
| |
| if (element.HasTagName(h4Tag)) |
| return 4; |
| |
| if (element.HasTagName(h5Tag)) |
| return 5; |
| |
| if (element.HasTagName(h6Tag)) |
| return 6; |
| |
| if (RoleValue() == kHeadingRole) |
| return kDefaultHeadingLevel; |
| |
| return 0; |
| } |
| |
| unsigned AXNodeObject::HierarchicalLevel() const { |
| Element* element = GetElement(); |
| if (!element) |
| return 0; |
| |
| uint32_t level; |
| if (HasAOMPropertyOrARIAAttribute(AOMUIntProperty::kLevel, level)) { |
| if (level >= 1 && level <= 9) |
| return level; |
| } |
| |
| // Only tree item will calculate its level through the DOM currently. |
| if (RoleValue() != kTreeItemRole) |
| return 0; |
| |
| // Hierarchy leveling starts at 1, to match the aria-level spec. |
| // We measure tree hierarchy by the number of groups that the item is within. |
| level = 1; |
| for (AXObject* parent = ParentObject(); parent; |
| parent = parent->ParentObject()) { |
| AccessibilityRole parent_role = parent->RoleValue(); |
| if (parent_role == kGroupRole) |
| level++; |
| else if (parent_role == kTreeRole) |
| break; |
| } |
| |
| return level; |
| } |
| |
| // TODO: rename this just AutoComplete, it's not only ARIA. |
| String AXNodeObject::AriaAutoComplete() const { |
| if (IsNativeTextControl() || IsARIATextControl()) { |
| const AtomicString& aria_auto_complete = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kAutocomplete) |
| .DeprecatedLower(); |
| // Illegal values must be passed through, according to CORE-AAM. |
| if (!aria_auto_complete.IsNull()) |
| return aria_auto_complete == "none" ? String() : aria_auto_complete; |
| } |
| |
| if (GetNode() && IsHTMLInputElement(*GetNode())) { |
| HTMLInputElement& input = ToHTMLInputElement(*GetNode()); |
| if (input.DataList()) |
| return "list"; |
| } |
| |
| return String(); |
| } |
| |
| namespace { |
| |
| bool MarkerTypeIsUsedForAccessibility(DocumentMarker::MarkerType type) { |
| return DocumentMarker::MarkerTypes( |
| DocumentMarker::kSpelling | DocumentMarker::kGrammar | |
| DocumentMarker::kTextMatch | DocumentMarker::kActiveSuggestion | |
| DocumentMarker::kSuggestion) |
| .Contains(type); |
| } |
| |
| } // namespace |
| |
| void AXNodeObject::Markers(Vector<DocumentMarker::MarkerType>& marker_types, |
| Vector<AXRange>& marker_ranges) const { |
| if (!GetNode() || !GetDocument() || !GetDocument()->View()) |
| return; |
| |
| if (!GetNode()->IsTextNode()) |
| return; |
| |
| DocumentMarkerController& marker_controller = GetDocument()->Markers(); |
| DocumentMarkerVector markers = marker_controller.MarkersFor(GetNode()); |
| for (size_t i = 0; i < markers.size(); ++i) { |
| DocumentMarker* marker = markers[i]; |
| if (MarkerTypeIsUsedForAccessibility(marker->GetType())) { |
| marker_types.push_back(marker->GetType()); |
| marker_ranges.emplace_back( |
| AXPosition::CreatePositionInTextObject(*this, marker->StartOffset()), |
| AXPosition::CreatePositionInTextObject(*this, marker->EndOffset())); |
| } |
| } |
| } |
| |
| AXObject* AXNodeObject::InPageLinkTarget() const { |
| if (!node_ || !IsHTMLAnchorElement(node_) || !GetDocument()) |
| return AXObject::InPageLinkTarget(); |
| |
| HTMLAnchorElement* anchor = ToHTMLAnchorElement(node_); |
| DCHECK(anchor); |
| KURL link_url = anchor->Href(); |
| if (!link_url.IsValid()) |
| return AXObject::InPageLinkTarget(); |
| String fragment = link_url.FragmentIdentifier(); |
| if (fragment.IsEmpty()) |
| return AXObject::InPageLinkTarget(); |
| |
| KURL document_url = GetDocument()->Url(); |
| if (!document_url.IsValid() || |
| !EqualIgnoringFragmentIdentifier(document_url, link_url)) { |
| return AXObject::InPageLinkTarget(); |
| } |
| |
| TreeScope& tree_scope = anchor->GetTreeScope(); |
| Element* target = tree_scope.FindAnchor(fragment); |
| if (!target) |
| return AXObject::InPageLinkTarget(); |
| // If the target is not in the accessibility tree, get the first unignored |
| // sibling. |
| return AXObjectCache().FirstAccessibleObjectFromNode(target); |
| } |
| |
| AccessibilityOrientation AXNodeObject::Orientation() const { |
| const AtomicString& aria_orientation = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kOrientation); |
| AccessibilityOrientation orientation = kAccessibilityOrientationUndefined; |
| if (EqualIgnoringASCIICase(aria_orientation, "horizontal")) |
| orientation = kAccessibilityOrientationHorizontal; |
| else if (EqualIgnoringASCIICase(aria_orientation, "vertical")) |
| orientation = kAccessibilityOrientationVertical; |
| |
| switch (RoleValue()) { |
| case kListBoxRole: |
| case kMenuRole: |
| case kScrollBarRole: |
| case kTreeRole: |
| if (orientation == kAccessibilityOrientationUndefined) |
| orientation = kAccessibilityOrientationVertical; |
| |
| return orientation; |
| case kMenuBarRole: |
| case kSliderRole: |
| case kSplitterRole: |
| case kTabListRole: |
| case kToolbarRole: |
| if (orientation == kAccessibilityOrientationUndefined) |
| orientation = kAccessibilityOrientationHorizontal; |
| |
| return orientation; |
| case kComboBoxGroupingRole: |
| case kComboBoxMenuButtonRole: |
| case kRadioGroupRole: |
| case kTreeGridRole: |
| return orientation; |
| default: |
| return AXObject::Orientation(); |
| } |
| } |
| |
| AXObject::AXObjectVector AXNodeObject::RadioButtonsInGroup() const { |
| AXObjectVector radio_buttons; |
| if (!node_ || RoleValue() != kRadioButtonRole) |
| return radio_buttons; |
| |
| if (auto* radio_button = ToHTMLInputElementOrNull(node_)) { |
| HeapVector<Member<HTMLInputElement>> html_radio_buttons = |
| FindAllRadioButtonsWithSameName(radio_button); |
| for (size_t i = 0; i < html_radio_buttons.size(); ++i) { |
| AXObject* ax_radio_button = |
| AXObjectCache().GetOrCreate(html_radio_buttons[i]); |
| if (ax_radio_button) |
| radio_buttons.push_back(ax_radio_button); |
| } |
| return radio_buttons; |
| } |
| |
| // If the immediate parent is a radio group, return all its children that are |
| // radio buttons. |
| AXObject* parent = ParentObject(); |
| if (parent && parent->RoleValue() == kRadioGroupRole) { |
| for (size_t i = 0; i < parent->Children().size(); ++i) { |
| AXObject* child = parent->Children()[i]; |
| DCHECK(child); |
| if (child->RoleValue() == kRadioButtonRole && |
| !child->AccessibilityIsIgnored()) { |
| radio_buttons.push_back(child); |
| } |
| } |
| } |
| |
| return radio_buttons; |
| } |
| |
| // static |
| HeapVector<Member<HTMLInputElement>> |
| AXNodeObject::FindAllRadioButtonsWithSameName(HTMLInputElement* radio_button) { |
| HeapVector<Member<HTMLInputElement>> all_radio_buttons; |
| if (!radio_button || radio_button->type() != InputTypeNames::radio) |
| return all_radio_buttons; |
| |
| constexpr bool kTraverseForward = true; |
| constexpr bool kTraverseBackward = false; |
| HTMLInputElement* first_radio_button = radio_button; |
| do { |
| radio_button = RadioInputType::NextRadioButtonInGroup(first_radio_button, |
| kTraverseBackward); |
| if (radio_button) |
| first_radio_button = radio_button; |
| } while (radio_button); |
| |
| HTMLInputElement* next_radio_button = first_radio_button; |
| do { |
| all_radio_buttons.push_back(next_radio_button); |
| next_radio_button = RadioInputType::NextRadioButtonInGroup( |
| next_radio_button, kTraverseForward); |
| } while (next_radio_button); |
| return all_radio_buttons; |
| } |
| |
| String AXNodeObject::GetText() const { |
| if (!IsTextControl()) |
| return String(); |
| |
| Node* node = this->GetNode(); |
| if (!node) |
| return String(); |
| |
| if (IsNativeTextControl() && |
| (IsHTMLTextAreaElement(*node) || IsHTMLInputElement(*node))) { |
| return ToTextControl(*node).value(); |
| } |
| |
| if (!node->IsElementNode()) |
| return String(); |
| |
| return ToElement(node)->innerText(); |
| } |
| |
| RGBA32 AXNodeObject::ColorValue() const { |
| if (!IsHTMLInputElement(GetNode()) || !IsColorWell()) |
| return AXObject::ColorValue(); |
| |
| HTMLInputElement* input = ToHTMLInputElement(GetNode()); |
| const AtomicString& type = input->getAttribute(typeAttr); |
| if (!EqualIgnoringASCIICase(type, "color")) |
| return AXObject::ColorValue(); |
| |
| // HTMLInputElement::value always returns a string parseable by Color. |
| Color color; |
| bool success = color.SetFromString(input->value()); |
| DCHECK(success); |
| return color.Rgb(); |
| } |
| |
| AriaCurrentState AXNodeObject::GetAriaCurrentState() const { |
| const AtomicString& attribute_value = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kCurrent); |
| if (attribute_value.IsNull()) |
| return kAriaCurrentStateUndefined; |
| if (attribute_value.IsEmpty() || |
| EqualIgnoringASCIICase(attribute_value, "false")) |
| return kAriaCurrentStateFalse; |
| if (EqualIgnoringASCIICase(attribute_value, "true")) |
| return kAriaCurrentStateTrue; |
| if (EqualIgnoringASCIICase(attribute_value, "page")) |
| return kAriaCurrentStatePage; |
| if (EqualIgnoringASCIICase(attribute_value, "step")) |
| return kAriaCurrentStateStep; |
| if (EqualIgnoringASCIICase(attribute_value, "location")) |
| return kAriaCurrentStateLocation; |
| if (EqualIgnoringASCIICase(attribute_value, "date")) |
| return kAriaCurrentStateDate; |
| if (EqualIgnoringASCIICase(attribute_value, "time")) |
| return kAriaCurrentStateTime; |
| // An unknown value should return true. |
| if (!attribute_value.IsEmpty()) |
| return kAriaCurrentStateTrue; |
| |
| return AXObject::GetAriaCurrentState(); |
| } |
| |
| InvalidState AXNodeObject::GetInvalidState() const { |
| const AtomicString& attribute_value = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kInvalid); |
| if (EqualIgnoringASCIICase(attribute_value, "false")) |
| return kInvalidStateFalse; |
| if (EqualIgnoringASCIICase(attribute_value, "true")) |
| return kInvalidStateTrue; |
| if (EqualIgnoringASCIICase(attribute_value, "spelling")) |
| return kInvalidStateSpelling; |
| if (EqualIgnoringASCIICase(attribute_value, "grammar")) |
| return kInvalidStateGrammar; |
| // A yet unknown value. |
| if (!attribute_value.IsEmpty()) |
| return kInvalidStateOther; |
| |
| if (GetNode() && GetNode()->IsElementNode() && |
| ToElement(GetNode())->IsFormControlElement()) { |
| HTMLFormControlElement* element = ToHTMLFormControlElement(GetNode()); |
| HeapVector<Member<HTMLFormControlElement>> invalid_controls; |
| bool is_invalid = !element->checkValidity(&invalid_controls, |
| kCheckValidityDispatchNoEvent); |
| return is_invalid ? kInvalidStateTrue : kInvalidStateFalse; |
| } |
| |
| return AXObject::GetInvalidState(); |
| } |
| |
| int AXNodeObject::PosInSet() const { |
| if (SupportsARIASetSizeAndPosInSet()) { |
| uint32_t pos_in_set; |
| if (HasAOMPropertyOrARIAAttribute(AOMUIntProperty::kPosInSet, pos_in_set)) |
| return pos_in_set; |
| |
| return AutoPosInSet(); |
| } |
| |
| return 0; |
| } |
| |
| int AXNodeObject::SetSize() const { |
| if (SupportsARIASetSizeAndPosInSet()) { |
| int32_t set_size; |
| if (HasAOMPropertyOrARIAAttribute(AOMIntProperty::kSetSize, set_size)) |
| return set_size; |
| |
| return AutoSetSize(); |
| } |
| |
| return 0; |
| } |
| |
| int AXNodeObject::AutoPosInSet() const { |
| AXObject* parent = ParentObjectUnignored(); |
| |
| // Do not continue if the children will need updating soon, because |
| // the calculation requires all the siblings to remain stable. |
| if (!parent || parent->NeedsToUpdateChildren()) |
| return 0; |
| |
| int pos_in_set = 1; |
| const AXObject::AXObjectVector siblings = parent->Children(); |
| |
| AccessibilityRole role = RoleValue(); |
| int level = HierarchicalLevel(); |
| int index_in_parent = IndexInParent(); |
| |
| for (int index = index_in_parent - 1; index >= 0; index--) { |
| const AXObject* sibling = siblings[index]; |
| AccessibilityRole sibling_role = sibling->RoleValue(); |
| if (sibling_role == kSplitterRole || sibling_role == kGroupRole) |
| break; // Set stops at a separator or an optgroup. |
| if (sibling_role != role || sibling->AccessibilityIsIgnored()) |
| continue; |
| |
| int sibling_level = sibling->HierarchicalLevel(); |
| if (sibling_level < level) |
| break; |
| |
| if (sibling_level > level) |
| continue; // Skip subset |
| |
| ++pos_in_set; |
| } |
| |
| return pos_in_set; |
| } |
| |
| int AXNodeObject::AutoSetSize() const { |
| AXObject* parent = ParentObjectUnignored(); |
| |
| // Do not continue if the children will need updating soon, because |
| // the calculation requires all the siblings to remain stable. |
| if (!parent || parent->NeedsToUpdateChildren()) |
| return 0; |
| |
| int set_size = AutoPosInSet(); |
| auto siblings = parent->Children(); |
| |
| AccessibilityRole role = RoleValue(); |
| int level = HierarchicalLevel(); |
| int index_in_parent = IndexInParent(); |
| int sibling_count = siblings.size(); |
| |
| for (int index = index_in_parent + 1; index < sibling_count; index++) { |
| const auto sibling = siblings[index]; |
| AccessibilityRole sibling_role = sibling->RoleValue(); |
| if (sibling_role == kSplitterRole || sibling_role == kGroupRole) |
| break; // Set stops at a separator or an optgroup. |
| if (sibling_role != role || sibling->AccessibilityIsIgnored()) |
| continue; |
| |
| int sibling_level = sibling->HierarchicalLevel(); |
| if (sibling_level < level) |
| break; |
| |
| if (sibling_level > level) |
| continue; // Skip subset |
| |
| ++set_size; |
| } |
| |
| return set_size; |
| } |
| |
| String AXNodeObject::AriaInvalidValue() const { |
| if (GetInvalidState() == kInvalidStateOther) |
| return GetAOMPropertyOrARIAAttribute(AOMStringProperty::kInvalid); |
| |
| return String(); |
| } |
| |
| String AXNodeObject::ValueDescription() const { |
| if (!SupportsRangeValue()) |
| return String(); |
| |
| return GetAOMPropertyOrARIAAttribute(AOMStringProperty::kValueText) |
| .GetString(); |
| } |
| |
| bool AXNodeObject::ValueForRange(float* out_value) const { |
| float value_now; |
| if (HasAOMPropertyOrARIAAttribute(AOMFloatProperty::kValueNow, value_now)) { |
| *out_value = value_now; |
| return true; |
| } |
| |
| if (IsNativeSlider() || IsNativeSpinButton()) { |
| *out_value = ToHTMLInputElement(*GetNode()).valueAsNumber(); |
| return std::isfinite(*out_value); |
| } |
| |
| if (auto* meter = ToHTMLMeterElementOrNull(GetNode())) { |
| *out_value = meter->value(); |
| return true; |
| } |
| |
| // In ARIA 1.1, default values for aria-valuenow were changed as below. |
| // - scrollbar, slider : half way between aria-valuemin and aria-valuemax |
| // - separator : 50 |
| // - spinbutton : 0 |
| switch (AriaRoleAttribute()) { |
| case kScrollBarRole: |
| case kSliderRole: { |
| float min_value, max_value; |
| if (MinValueForRange(&min_value) && MaxValueForRange(&max_value)) { |
| *out_value = (min_value + max_value) / 2.0f; |
| return true; |
| } |
| FALLTHROUGH; |
| } |
| case kSplitterRole: { |
| *out_value = 50.0f; |
| return true; |
| } |
| case kSpinButtonRole: { |
| *out_value = 0.0f; |
| return true; |
| } |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool AXNodeObject::MaxValueForRange(float* out_value) const { |
| float value_max; |
| if (HasAOMPropertyOrARIAAttribute(AOMFloatProperty::kValueMax, value_max)) { |
| *out_value = value_max; |
| return true; |
| } |
| |
| if (IsNativeSlider() || IsNativeSpinButton()) { |
| *out_value = static_cast<float>(ToHTMLInputElement(*GetNode()).Maximum()); |
| return std::isfinite(*out_value); |
| } |
| |
| if (auto* meter = ToHTMLMeterElementOrNull(GetNode())) { |
| *out_value = meter->max(); |
| return true; |
| } |
| |
| // In ARIA 1.1, default value of scrollbar, separator and slider |
| // for aria-valuemax were changed to 100. |
| switch (AriaRoleAttribute()) { |
| case kScrollBarRole: |
| case kSplitterRole: |
| case kSliderRole: { |
| *out_value = 100.0f; |
| return true; |
| } |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool AXNodeObject::MinValueForRange(float* out_value) const { |
| float value_min; |
| if (HasAOMPropertyOrARIAAttribute(AOMFloatProperty::kValueMin, value_min)) { |
| *out_value = value_min; |
| return true; |
| } |
| |
| if (IsNativeSlider() || IsNativeSpinButton()) { |
| *out_value = static_cast<float>(ToHTMLInputElement(*GetNode()).Minimum()); |
| return std::isfinite(*out_value); |
| } |
| |
| if (auto* meter = ToHTMLMeterElementOrNull(GetNode())) { |
| *out_value = meter->min(); |
| return true; |
| } |
| |
| // In ARIA 1.1, default value of scrollbar, separator and slider |
| // for aria-valuemin were changed to 0. |
| switch (AriaRoleAttribute()) { |
| case kScrollBarRole: |
| case kSplitterRole: |
| case kSliderRole: { |
| *out_value = 0.0f; |
| return true; |
| } |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool AXNodeObject::StepValueForRange(float* out_value) const { |
| if (IsNativeSlider() || IsNativeSpinButton()) { |
| Decimal step = |
| ToHTMLInputElement(*GetNode()).CreateStepRange(kRejectAny).Step(); |
| *out_value = step.ToString().ToFloat(); |
| return std::isfinite(*out_value); |
| } |
| |
| switch (AriaRoleAttribute()) { |
| case kScrollBarRole: |
| case kSplitterRole: |
| case kSliderRole: { |
| *out_value = 0.0f; |
| return true; |
| } |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| String AXNodeObject::StringValue() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return String(); |
| |
| if (auto* select_element = ToHTMLSelectElementOrNull(*node)) { |
| int selected_index = select_element->selectedIndex(); |
| const HeapVector<Member<HTMLElement>>& list_items = |
| select_element->GetListItems(); |
| if (selected_index >= 0 && |
| static_cast<size_t>(selected_index) < list_items.size()) { |
| const AtomicString& overridden_description = |
| list_items[selected_index]->FastGetAttribute(aria_labelAttr); |
| if (!overridden_description.IsNull()) |
| return overridden_description; |
| } |
| if (!select_element->IsMultiple()) |
| return select_element->value(); |
| return String(); |
| } |
| |
| if (IsNativeTextControl()) |
| return GetText(); |
| |
| // Handle other HTML input elements that aren't text controls, like date and |
| // time controls, by returning the string value, with the exception of |
| // checkboxes and radio buttons (which would return "on"). |
| if (auto* input = ToHTMLInputElementOrNull(node)) { |
| if (input->type() != InputTypeNames::checkbox && |
| input->type() != InputTypeNames::radio) |
| return input->value(); |
| } |
| |
| return String(); |
| } |
| |
| AccessibilityRole AXNodeObject::AriaRoleAttribute() const { |
| return aria_role_; |
| } |
| |
| // Returns the nearest block-level LayoutBlockFlow ancestor |
| static LayoutBlockFlow* NonInlineBlockFlow(LayoutObject* object) { |
| LayoutObject* current = object; |
| while (current) { |
| if (current->IsLayoutBlockFlow()) { |
| LayoutBlockFlow* block_flow = ToLayoutBlockFlow(current); |
| if (!block_flow->IsAtomicInlineLevel()) |
| return block_flow; |
| } |
| current = current->Parent(); |
| } |
| |
| NOTREACHED(); |
| return nullptr; |
| } |
| |
| // Returns true if |r1| and |r2| are both non-null, both inline, and are |
| // contained within the same non-inline LayoutBlockFlow. |
| static bool IsInSameNonInlineBlockFlow(LayoutObject* r1, LayoutObject* r2) { |
| if (!r1 || !r2) |
| return false; |
| if (!r1->IsInline() || !r2->IsInline()) |
| return false; |
| LayoutBlockFlow* b1 = NonInlineBlockFlow(r1); |
| LayoutBlockFlow* b2 = NonInlineBlockFlow(r2); |
| return b1 && b2 && b1 == b2; |
| } |
| |
| // |
| // New AX name calculation. |
| // |
| |
| String AXNodeObject::GetName(AXNameFrom& name_from, |
| AXObjectVector* name_objects) const { |
| String name = AXObject::GetName(name_from, name_objects); |
| if (RoleValue() == kSpinButtonRole && DatetimeAncestor()) { |
| // Fields inside a datetime control need to merge the field name with |
| // the name of the <input> element. |
| name_objects->clear(); |
| String input_name = DatetimeAncestor()->GetName(name_from, name_objects); |
| if (!input_name.IsEmpty()) |
| return name + " " + input_name; |
| } |
| |
| return name; |
| } |
| |
| String AXNodeObject::TextAlternative(bool recursive, |
| bool in_aria_labelled_by_traversal, |
| AXObjectSet& visited, |
| AXNameFrom& name_from, |
| AXRelatedObjectVector* related_objects, |
| NameSources* name_sources) const { |
| // If nameSources is non-null, relatedObjects is used in filling it in, so it |
| // must be non-null as well. |
| if (name_sources) |
| DCHECK(related_objects); |
| |
| bool found_text_alternative = false; |
| |
| if (!GetNode() && !GetLayoutObject()) |
| return String(); |
| |
| String text_alternative = AriaTextAlternative( |
| recursive, in_aria_labelled_by_traversal, visited, name_from, |
| related_objects, name_sources, &found_text_alternative); |
| if (found_text_alternative && !name_sources) |
| return text_alternative; |
| |
| // Step 2E from: http://www.w3.org/TR/accname-aam-1.1 -- value from control |
| if (recursive && !in_aria_labelled_by_traversal && CanSetValueAttribute()) { |
| // No need to set any name source info in a recursive call. |
| if (IsTextControl()) |
| return GetText(); |
| |
| if (IsRange()) { |
| const AtomicString& aria_valuetext = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kValueText); |
| if (!aria_valuetext.IsNull()) |
| return aria_valuetext.GetString(); |
| float value; |
| if (ValueForRange(&value)) |
| return String::Number(value); |
| } |
| |
| return StringValue(); |
| } |
| |
| // Step 2D from: http://www.w3.org/TR/accname-aam-1.1 |
| text_alternative = |
| NativeTextAlternative(visited, name_from, related_objects, name_sources, |
| &found_text_alternative); |
| const bool has_text_alternative = |
| !text_alternative.IsEmpty() || |
| name_from == kAXNameFromAttributeExplicitlyEmpty; |
| if (has_text_alternative && !name_sources) |
| return text_alternative; |
| |
| // Step 2F / 2G from: http://www.w3.org/TR/accname-aam-1.1 |
| if (in_aria_labelled_by_traversal || NameFromContents(recursive)) { |
| Node* node = GetNode(); |
| if (!IsHTMLSelectElement(node)) { // Avoid option descendant text |
| name_from = kAXNameFromContents; |
| if (name_sources) { |
| name_sources->push_back(NameSource(found_text_alternative)); |
| name_sources->back().type = name_from; |
| } |
| |
| if (node && node->IsTextNode()) |
| text_alternative = ToText(node)->wholeText(); |
| else if (IsHTMLBRElement(node)) |
| text_alternative = String("\n"); |
| else |
| text_alternative = TextFromDescendants(visited, false); |
| |
| if (!text_alternative.IsEmpty()) { |
| if (name_sources) { |
| found_text_alternative = true; |
| name_sources->back().text = text_alternative; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| } |
| |
| // Step 2H from: http://www.w3.org/TR/accname-aam-1.1 |
| name_from = kAXNameFromTitle; |
| if (name_sources) { |
| name_sources->push_back(NameSource(found_text_alternative, titleAttr)); |
| name_sources->back().type = name_from; |
| } |
| const AtomicString& title = GetAttribute(titleAttr); |
| if (!title.IsEmpty()) { |
| text_alternative = title; |
| if (name_sources) { |
| found_text_alternative = true; |
| name_sources->back().text = text_alternative; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| name_from = kAXNameFromUninitialized; |
| |
| if (name_sources && found_text_alternative) { |
| for (size_t i = 0; i < name_sources->size(); ++i) { |
| if (!(*name_sources)[i].text.IsNull() && !(*name_sources)[i].superseded) { |
| NameSource& name_source = (*name_sources)[i]; |
| name_from = name_source.type; |
| if (!name_source.related_objects.IsEmpty()) |
| *related_objects = name_source.related_objects; |
| return name_source.text; |
| } |
| } |
| } |
| |
| return String(); |
| } |
| |
| String AXNodeObject::TextFromDescendants(AXObjectSet& visited, |
| bool recursive) const { |
| if (!CanHaveChildren() && recursive) |
| return String(); |
| |
| StringBuilder accumulated_text; |
| AXObject* previous = nullptr; |
| |
| AXObjectVector children; |
| |
| HeapVector<Member<AXObject>> owned_children; |
| ComputeAriaOwnsChildren(owned_children); |
| for (AXObject* obj = RawFirstChild(); obj; obj = obj->RawNextSibling()) { |
| if (!AXObjectCache().IsAriaOwned(obj)) |
| children.push_back(obj); |
| } |
| for (const auto& owned_child : owned_children) |
| children.push_back(owned_child); |
| |
| for (AXObject* child : children) { |
| // Don't recurse into children that are explicitly marked as aria-hidden. |
| // Note that we don't call isInertOrAriaHidden because that would return |
| // true if any ancestor is hidden, but we need to be able to compute the |
| // accessible name of object inside hidden subtrees (for example, if |
| // aria-labelledby points to an object that's hidden). |
| if (child->AOMPropertyOrARIAAttributeIsTrue(AOMBooleanProperty::kHidden)) |
| continue; |
| |
| // If we're going between two layoutObjects that are in separate |
| // LayoutBoxes, add whitespace if it wasn't there already. Intuitively if |
| // you have <span>Hello</span><span>World</span>, those are part of the same |
| // LayoutBox so we should return "HelloWorld", but given |
| // <div>Hello</div><div>World</div> the strings are in separate boxes so we |
| // should return "Hello World". |
| if (previous && accumulated_text.length() && |
| !IsHTMLSpace(accumulated_text[accumulated_text.length() - 1])) { |
| if (!IsInSameNonInlineBlockFlow(child->GetLayoutObject(), |
| previous->GetLayoutObject())) |
| accumulated_text.Append(' '); |
| } |
| |
| String result; |
| if (child->IsPresentational()) |
| result = child->TextFromDescendants(visited, true); |
| else |
| result = RecursiveTextAlternative(*child, false, visited); |
| accumulated_text.Append(result); |
| previous = child; |
| } |
| |
| return accumulated_text.ToString(); |
| } |
| |
| bool AXNodeObject::NameFromLabelElement() const { |
| // This unfortunately duplicates a bit of logic from textAlternative and |
| // nativeTextAlternative, but it's necessary because nameFromLabelElement |
| // needs to be called from computeAccessibilityIsIgnored, which isn't allowed |
| // to call axObjectCache->getOrCreate. |
| |
| if (!GetNode() && !GetLayoutObject()) |
| return false; |
| |
| // Step 2A from: http://www.w3.org/TR/accname-aam-1.1 |
| if (IsHiddenForTextAlternativeCalculation()) |
| return false; |
| |
| // Step 2B from: http://www.w3.org/TR/accname-aam-1.1 |
| HeapVector<Member<Element>> elements; |
| Vector<String> ids; |
| AriaLabelledbyElementVector(elements, ids); |
| if (ids.size() > 0) |
| return false; |
| |
| // Step 2C from: http://www.w3.org/TR/accname-aam-1.1 |
| const AtomicString& aria_label = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kLabel); |
| if (!aria_label.IsEmpty()) |
| return false; |
| |
| // Based on |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html#accessible-name-and-description-calculation |
| // 5.1/5.5 Text inputs, Other labelable Elements |
| HTMLElement* html_element = nullptr; |
| if (GetNode()->IsHTMLElement()) |
| html_element = ToHTMLElement(GetNode()); |
| if (html_element && IsLabelableElement(html_element)) { |
| if (ToLabelableElement(html_element)->labels() && |
| ToLabelableElement(html_element)->labels()->length() > 0) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void AXNodeObject::GetRelativeBounds(AXObject** out_container, |
| FloatRect& out_bounds_in_container, |
| SkMatrix44& out_container_transform, |
| bool* clips_children) const { |
| if (LayoutObjectForRelativeBounds()) { |
| AXObject::GetRelativeBounds(out_container, out_bounds_in_container, |
| out_container_transform, clips_children); |
| return; |
| } |
| |
| *out_container = nullptr; |
| out_bounds_in_container = FloatRect(); |
| out_container_transform.setIdentity(); |
| |
| // First check if it has explicit bounds, for example if this element is tied |
| // to a canvas path. When explicit coordinates are provided, the ID of the |
| // explicit container element that the coordinates are relative to must be |
| // provided too. |
| if (!explicit_element_rect_.IsEmpty()) { |
| *out_container = AXObjectCache().ObjectFromAXID(explicit_container_id_); |
| if (*out_container) { |
| out_bounds_in_container = FloatRect(explicit_element_rect_); |
| return; |
| } |
| } |
| |
| // If it's in a canvas but doesn't have an explicit rect, get the bounding |
| // rect of its children. |
| if (GetNode()->parentElement()->IsInCanvasSubtree()) { |
| Vector<FloatRect> rects; |
| for (Node& child : NodeTraversal::ChildrenOf(*GetNode())) { |
| if (child.IsHTMLElement()) { |
| if (AXObject* obj = AXObjectCache().Get(&child)) { |
| AXObject* container; |
| FloatRect bounds; |
| obj->GetRelativeBounds(&container, bounds, out_container_transform, |
| clips_children); |
| if (container) { |
| *out_container = container; |
| rects.push_back(bounds); |
| } |
| } |
| } |
| } |
| |
| if (*out_container) { |
| out_bounds_in_container = UnionRect(rects); |
| return; |
| } |
| } |
| |
| // If this object doesn't have an explicit element rect or computable from its |
| // children, for now, let's return the position of the ancestor that does have |
| // a position, and make it the width of that parent, and about the height of a |
| // line of text, so that it's clear the object is a child of the parent. |
| for (AXObject* position_provider = ParentObject(); position_provider; |
| position_provider = position_provider->ParentObject()) { |
| if (position_provider->IsAXLayoutObject()) { |
| position_provider->GetRelativeBounds( |
| out_container, out_bounds_in_container, out_container_transform, |
| clips_children); |
| if (*out_container) |
| out_bounds_in_container.SetSize( |
| FloatSize(out_bounds_in_container.Width(), |
| std::min(10.0f, out_bounds_in_container.Height()))); |
| break; |
| } |
| } |
| } |
| |
| static Node* GetParentNodeForComputeParent(Node* node) { |
| if (!node) |
| return nullptr; |
| |
| Node* parent_node = nullptr; |
| |
| // Skip over <optgroup> and consider the <select> the immediate parent of an |
| // <option>. |
| if (auto* option = ToHTMLOptionElementOrNull(node)) |
| parent_node = option->OwnerSelectElement(); |
| |
| if (!parent_node) |
| parent_node = node->parentNode(); |
| |
| return parent_node; |
| } |
| |
| AXObject* AXNodeObject::ComputeParent() const { |
| DCHECK(!IsDetached()); |
| if (Node* parent_node = GetParentNodeForComputeParent(GetNode())) |
| return AXObjectCache().GetOrCreate(parent_node); |
| |
| return nullptr; |
| } |
| |
| AXObject* AXNodeObject::ComputeParentIfExists() const { |
| if (Node* parent_node = GetParentNodeForComputeParent(GetNode())) |
| return AXObjectCache().Get(parent_node); |
| |
| return nullptr; |
| } |
| |
| AXObject* AXNodeObject::RawFirstChild() const { |
| if (!GetNode()) |
| return nullptr; |
| |
| Node* first_child = GetNode()->firstChild(); |
| |
| if (!first_child) |
| return nullptr; |
| |
| return AXObjectCache().GetOrCreate(first_child); |
| } |
| |
| AXObject* AXNodeObject::RawNextSibling() const { |
| if (!GetNode()) |
| return nullptr; |
| |
| Node* next_sibling = GetNode()->nextSibling(); |
| if (!next_sibling) |
| return nullptr; |
| |
| return AXObjectCache().GetOrCreate(next_sibling); |
| } |
| |
| void AXNodeObject::AddChildren() { |
| DCHECK(!IsDetached()); |
| // If the need to add more children in addition to existing children arises, |
| // childrenChanged should have been called, leaving the object with no |
| // children. |
| DCHECK(!have_children_); |
| |
| if (!node_) |
| return; |
| |
| have_children_ = true; |
| |
| // The only time we add children from the DOM tree to a node with a |
| // layoutObject is when it's a canvas. |
| if (GetLayoutObject() && !IsHTMLCanvasElement(*node_)) |
| return; |
| |
| HeapVector<Member<AXObject>> owned_children; |
| ComputeAriaOwnsChildren(owned_children); |
| |
| for (Node& child : NodeTraversal::ChildrenOf(*node_)) { |
| AXObject* child_obj = AXObjectCache().GetOrCreate(&child); |
| if (child_obj && !AXObjectCache().IsAriaOwned(child_obj)) |
| AddChild(child_obj); |
| } |
| |
| for (const auto& owned_child : owned_children) |
| AddChild(owned_child); |
| |
| for (const auto& child : children_) |
| child->SetParent(this); |
| |
| AddAccessibleNodeChildren(); |
| } |
| |
| void AXNodeObject::AddChild(AXObject* child) { |
| InsertChild(child, children_.size()); |
| } |
| |
| void AXNodeObject::InsertChild(AXObject* child, unsigned index) { |
| if (!child) |
| return; |
| |
| // If the parent is asking for this child's children, then either it's the |
| // first time (and clearing is a no-op), or its visibility has changed. In the |
| // latter case, this child may have a stale child cached. This can prevent |
| // aria-hidden changes from working correctly. Hence, whenever a parent is |
| // getting children, ensure data is not stale. |
| child->ClearChildren(); |
| |
| if (child->AccessibilityIsIgnored()) { |
| const auto& children = child->Children(); |
| size_t length = children.size(); |
| for (size_t i = 0; i < length; ++i) |
| children_.insert(index + i, children[i]); |
| } else { |
| DCHECK_EQ(child->ParentObject(), this); |
| children_.insert(index, child); |
| } |
| } |
| |
| bool AXNodeObject::CanHaveChildren() const { |
| // If this is an AXLayoutObject, then it's okay if this object |
| // doesn't have a node - there are some layoutObjects that don't have |
| // associated nodes, like scroll areas and css-generated text. |
| if (!GetNode() && !IsAXLayoutObject()) |
| return false; |
| |
| if (GetNode() && IsHTMLMapElement(GetNode())) |
| return false; // Does not have a role, so check here |
| |
| // Placeholder gets exposed as an attribute on the input accessibility node, |
| // so there's no need to add its text children. |
| if (GetElement() && GetElement()->ShadowPseudoId() == |
| AtomicString("-webkit-input-placeholder")) { |
| return false; |
| } |
| |
| switch (NativeAccessibilityRoleIgnoringAria()) { |
| case kButtonRole: |
| case kCheckBoxRole: |
| case kImageRole: |
| case kListBoxOptionRole: |
| case kMenuButtonRole: |
| case kMenuListOptionRole: |
| case kMenuItemRole: |
| case kMenuItemCheckBoxRole: |
| case kMenuItemRadioRole: |
| case kProgressIndicatorRole: |
| case kRadioButtonRole: |
| case kScrollBarRole: |
| // case kSearchBoxRole: |
| case kSliderRole: |
| case kSplitterRole: |
| case kSwitchRole: |
| case kTabRole: |
| // case kTextFieldRole: |
| case kToggleButtonRole: |
| return false; |
| case kPopUpButtonRole: |
| return true; |
| case kStaticTextRole: |
| return AXObjectCache().InlineTextBoxAccessibilityEnabled(); |
| default: |
| break; |
| } |
| |
| switch (AriaRoleAttribute()) { |
| case kImageRole: |
| return false; |
| case kButtonRole: |
| case kCheckBoxRole: |
| case kListBoxOptionRole: |
| case kMathRole: // role="math" is flat, unlike <math> |
| case kMenuButtonRole: |
| case kMenuListOptionRole: |
| case kMenuItemRole: |
| case kMenuItemCheckBoxRole: |
| case kMenuItemRadioRole: |
| case kPopUpButtonRole: |
| case kProgressIndicatorRole: |
| case kRadioButtonRole: |
| case kScrollBarRole: |
| case kSliderRole: |
| case kSplitterRole: |
| case kSwitchRole: |
| case kTabRole: |
| case kToggleButtonRole: { |
| // These roles have ChildrenPresentational: true in the ARIA spec. |
| // We used to remove/prune all descendants of them, but that removed |
| // useful content if the author didn't follow the spec perfectly, for |
| // example if they wanted a complex radio button with a textfield child. |
| // We are now only pruning these if there is a single text child, |
| // otherwise the subtree is exposed. The ChildrenPresentational rule |
| // is thus useful for authoring/verification tools but does not break |
| // complex widget implementations. |
| Element* element = GetElement(); |
| return element && !element->HasOneTextChild(); |
| } |
| default: |
| break; |
| } |
| return true; |
| } |
| |
| Element* AXNodeObject::ActionElement() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return nullptr; |
| |
| if (node->IsElementNode() && IsClickable()) |
| return ToElement(node); |
| |
| Element* anchor = AnchorElement(); |
| Element* click_element = MouseButtonListener(); |
| if (!anchor || (click_element && click_element->IsDescendantOf(anchor))) |
| return click_element; |
| return anchor; |
| } |
| |
| Element* AXNodeObject::AnchorElement() const { |
| Node* node = this->GetNode(); |
| if (!node) |
| return nullptr; |
| |
| AXObjectCacheImpl& cache = AXObjectCache(); |
| |
| // search up the DOM tree for an anchor element |
| // NOTE: this assumes that any non-image with an anchor is an |
| // HTMLAnchorElement |
| for (; node; node = node->parentNode()) { |
| if (IsHTMLAnchorElement(*node) || |
| (node->GetLayoutObject() && |
| cache.GetOrCreate(node->GetLayoutObject())->IsAnchor())) |
| return ToElement(node); |
| } |
| |
| return nullptr; |
| } |
| |
| Document* AXNodeObject::GetDocument() const { |
| if (!GetNode()) |
| return nullptr; |
| return &GetNode()->GetDocument(); |
| } |
| |
| void AXNodeObject::SetNode(Node* node) { |
| node_ = node; |
| } |
| |
| AXObject* AXNodeObject::CorrespondingControlForLabelElement() const { |
| HTMLLabelElement* label_element = LabelElementContainer(); |
| if (!label_element) |
| return nullptr; |
| |
| HTMLElement* corresponding_control = label_element->control(); |
| if (!corresponding_control) |
| return nullptr; |
| |
| // Make sure the corresponding control isn't a descendant of this label |
| // that's in the middle of being destroyed. |
| if (corresponding_control->GetLayoutObject() && |
| !corresponding_control->GetLayoutObject()->Parent()) |
| return nullptr; |
| |
| return AXObjectCache().GetOrCreate(corresponding_control); |
| } |
| |
| HTMLLabelElement* AXNodeObject::LabelElementContainer() const { |
| if (!GetNode()) |
| return nullptr; |
| |
| // the control element should not be considered part of the label |
| if (IsControl()) |
| return nullptr; |
| |
| // the link element should not be considered part of the label |
| if (IsLink()) |
| return nullptr; |
| |
| // find if this has a ancestor that is a label |
| return Traversal<HTMLLabelElement>::FirstAncestorOrSelf(*GetNode()); |
| } |
| |
| bool AXNodeObject::OnNativeFocusAction() { |
| if (!CanSetFocusAttribute()) |
| return false; |
| |
| Document* document = GetDocument(); |
| if (IsWebArea()) { |
| document->ClearFocusedElement(); |
| return true; |
| } |
| |
| Element* element = GetElement(); |
| if (!element) { |
| document->ClearFocusedElement(); |
| return true; |
| } |
| |
| // If this node is already the currently focused node, then calling |
| // focus() won't do anything. That is a problem when focus is removed |
| // from the webpage to chrome, and then returns. In these cases, we need |
| // to do what keyboard and mouse focus do, which is reset focus first. |
| if (document->FocusedElement() == element) |
| document->ClearFocusedElement(); |
| |
| // If the object is not natively focusable but can be focused using an ARIA |
| // active descendant, perform a native click instead. This will enable Web |
| // apps that set accessibility focus using an active descendant to capture and |
| // act on the click event. Otherwise, there is no other way to inform the app |
| // that an AT has requested the focus to be changed, except if the app is |
| // using AOM. To be extra safe, exclude objects that are clickable themselves. |
| // This won't prevent anyone from having a click handler on the object's |
| // container. |
| if (!IsClickable() && element->FastHasAttribute(idAttr) && |
| CanBeActiveDescendant()) { |
| return OnNativeClickAction(); |
| } |
| |
| element->focus(); |
| return true; |
| } |
| |
| bool AXNodeObject::OnNativeIncrementAction() { |
| LocalFrame* frame = GetDocument() ? GetDocument()->GetFrame() : nullptr; |
| std::unique_ptr<UserGestureIndicator> gesture_indicator = |
| Frame::NotifyUserActivation(frame, UserGestureToken::kNewGesture); |
| AlterSliderOrSpinButtonValue(true); |
| return true; |
| } |
| |
| bool AXNodeObject::OnNativeDecrementAction() { |
| LocalFrame* frame = GetDocument() ? GetDocument()->GetFrame() : nullptr; |
| std::unique_ptr<UserGestureIndicator> gesture_indicator = |
| Frame::NotifyUserActivation(frame, UserGestureToken::kNewGesture); |
| AlterSliderOrSpinButtonValue(false); |
| return true; |
| } |
| |
| bool AXNodeObject::OnNativeSetSequentialFocusNavigationStartingPointAction() { |
| if (!GetNode()) |
| return false; |
| |
| Document* document = GetDocument(); |
| document->ClearFocusedElement(); |
| document->SetSequentialFocusNavigationStartingPoint(GetNode()); |
| return true; |
| } |
| |
| void AXNodeObject::ChildrenChanged() { |
| if (!GetNode() && !GetLayoutObject()) |
| return; |
| |
| // Call SetNeedsToUpdateChildren on this node, and if this node is |
| // ignored, call it on each existing parent until reaching an unignored node, |
| // because unignored nodes recursively include all children of ignored |
| // nodes. This method is called during layout, so we need to be careful to |
| // only explore existing objects. |
| AXObject* node_to_update = this; |
| while (node_to_update) { |
| node_to_update->SetNeedsToUpdateChildren(); |
| if (!node_to_update->LastKnownIsIgnoredValue()) |
| break; |
| node_to_update = node_to_update->ParentObjectIfExists(); |
| } |
| |
| // If this node's children are not part of the accessibility tree then |
| // skip notification and walking up the ancestors. |
| // Cases where this happens: |
| // - an ancestor has only presentational children, or |
| // - this or an ancestor is a leaf node |
| // Uses |cached_is_descendant_of_leaf_node_| to avoid updating cached |
| // attributes for eachc change via | UpdateCachedAttributeValuesIfNeeded()|. |
| if (!CanHaveChildren() || cached_is_descendant_of_leaf_node_) |
| return; |
| |
| AXObjectCache().PostNotification(this, AXObjectCacheImpl::kAXChildrenChanged); |
| |
| // Go up the accessibility parent chain, but only if the element already |
| // exists. This method is called during layout, minimal work should be done. |
| // If AX elements are created now, they could interrogate the layout tree |
| // while it's in a funky state. At the same time, process ARIA live region |
| // changes. |
| for (AXObject* parent = this; parent; |
| parent = parent->ParentObjectIfExists()) { |
| // These notifications always need to be sent because screenreaders are |
| // reliant on them to perform. In other words, they need to be sent even |
| // when the screen reader has not accessed this live region since the last |
| // update. |
| |
| // If this element supports ARIA live regions, then notify the AT of |
| // changes. |
| if (parent->IsLiveRegion()) |
| AXObjectCache().PostNotification(parent, |
| AXObjectCacheImpl::kAXLiveRegionChanged); |
| |
| // If this element is an ARIA text box or content editable, post a "value |
| // changed" notification on it so that it behaves just like a native input |
| // element or textarea. |
| if (IsNonNativeTextControl()) |
| AXObjectCache().PostNotification(parent, |
| AXObjectCacheImpl::kAXValueChanged); |
| } |
| } |
| |
| void AXNodeObject::SelectionChanged() { |
| // Post the selected text changed event on the first ancestor that's |
| // focused (to handle form controls, ARIA text boxes and contentEditable), |
| // or the web area if the selection is just in the document somewhere. |
| if (IsFocused() || IsWebArea()) { |
| AXObjectCache().PostNotification(this, |
| AXObjectCacheImpl::kAXSelectedTextChanged); |
| if (GetDocument()) { |
| AXObject* document_object = AXObjectCache().GetOrCreate(GetDocument()); |
| AXObjectCache().PostNotification( |
| document_object, AXObjectCacheImpl::kAXDocumentSelectionChanged); |
| } |
| } else { |
| AXObject::SelectionChanged(); // Calls selectionChanged on parent. |
| } |
| } |
| |
| void AXNodeObject::TextChanged() { |
| // If this element supports ARIA live regions, or is part of a region with an |
| // ARIA editable role, then notify the AT of changes. |
| AXObjectCacheImpl& cache = AXObjectCache(); |
| for (Node* parent_node = GetNode(); parent_node; |
| parent_node = parent_node->parentNode()) { |
| AXObject* parent = cache.Get(parent_node); |
| if (!parent) |
| continue; |
| |
| if (parent->IsLiveRegion()) |
| cache.PostNotification(parent_node, |
| AXObjectCacheImpl::kAXLiveRegionChanged); |
| |
| // If this element is an ARIA text box or content editable, post a "value |
| // changed" notification on it so that it behaves just like a native input |
| // element or textarea. |
| if (parent->IsNonNativeTextControl()) |
| cache.PostNotification(parent_node, AXObjectCacheImpl::kAXValueChanged); |
| } |
| } |
| |
| void AXNodeObject::ComputeAriaOwnsChildren( |
| HeapVector<Member<AXObject>>& owned_children) const { |
| Vector<String> id_vector; |
| // Case 1: owned children not allowed |
| if (!CanHaveChildren() || IsNativeTextControl() || |
| HasContentEditableAttributeSet()) { |
| if (GetNode()) |
| AXObjectCache().UpdateAriaOwns(this, id_vector, owned_children); |
| return; |
| } |
| |
| // Case 2: AOM owns property |
| HeapVector<Member<Element>> elements; |
| if (HasAOMProperty(AOMRelationListProperty::kOwns, elements)) { |
| AXObjectCache().UpdateAriaOwns(this, id_vector, owned_children); |
| |
| for (const auto& element : elements) { |
| AXObject* ax_element = ax_object_cache_->GetOrCreate(&*element); |
| if (ax_element && !ax_element->AccessibilityIsIgnored()) |
| owned_children.push_back(ax_element); |
| } |
| |
| return; |
| } |
| |
| if (!HasAttribute(aria_ownsAttr)) |
| return; |
| |
| // Case 3: aria-owns attribute |
| TokenVectorFromAttribute(id_vector, aria_ownsAttr); |
| AXObjectCache().UpdateAriaOwns(this, id_vector, owned_children); |
| } |
| |
| // Based on |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html#accessible-name-and-description-calculation |
| String AXNodeObject::NativeTextAlternative( |
| AXObjectSet& visited, |
| AXNameFrom& name_from, |
| AXRelatedObjectVector* related_objects, |
| NameSources* name_sources, |
| bool* found_text_alternative) const { |
| if (!GetNode()) |
| return String(); |
| |
| // If nameSources is non-null, relatedObjects is used in filling it in, so it |
| // must be non-null as well. |
| if (name_sources) |
| DCHECK(related_objects); |
| |
| String text_alternative; |
| AXRelatedObjectVector local_related_objects; |
| |
| const HTMLInputElement* input_element = ToHTMLInputElementOrNull(GetNode()); |
| |
| // 5.1/5.5 Text inputs, Other labelable Elements |
| // If you change this logic, update AXNodeObject::nameFromLabelElement, too. |
| HTMLElement* html_element = nullptr; |
| if (GetNode()->IsHTMLElement()) |
| html_element = ToHTMLElement(GetNode()); |
| |
| if (html_element && html_element->IsLabelable()) { |
| name_from = kAXNameFromRelatedElement; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLLabel; |
| } |
| |
| LabelsNodeList* labels = ToLabelableElement(html_element)->labels(); |
| if (labels && labels->length() > 0) { |
| HeapVector<Member<Element>> label_elements; |
| for (unsigned label_index = 0; label_index < labels->length(); |
| ++label_index) { |
| Element* label = labels->item(label_index); |
| if (name_sources) { |
| if (!label->getAttribute(forAttr).IsEmpty() && |
| label->getAttribute(forAttr) == html_element->GetIdAttribute()) { |
| name_sources->back().native_source = kAXTextFromNativeHTMLLabelFor; |
| } else { |
| name_sources->back().native_source = |
| kAXTextFromNativeHTMLLabelWrapped; |
| } |
| } |
| label_elements.push_back(label); |
| } |
| |
| text_alternative = |
| TextFromElements(false, visited, label_elements, related_objects); |
| if (!text_alternative.IsNull()) { |
| *found_text_alternative = true; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = text_alternative; |
| } else { |
| return text_alternative; |
| } |
| } else if (name_sources) { |
| name_sources->back().invalid = true; |
| } |
| } |
| } |
| |
| // 5.2 input type="button", input type="submit" and input type="reset" |
| if (input_element && input_element->IsTextButton()) { |
| // value attribue |
| name_from = kAXNameFromValue; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, valueAttr)); |
| name_sources->back().type = name_from; |
| } |
| String value = input_element->value(); |
| if (!value.IsNull()) { |
| text_alternative = value; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| // Get default value if object is not laid out. |
| // If object is laid out, it will have a layout object for the label. |
| if (!GetLayoutObject()) { |
| String default_label = input_element->ValueOrDefaultLabel(); |
| if (value.IsNull() && !default_label.IsNull()) { |
| // default label |
| name_from = kAXNameFromContents; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| } |
| text_alternative = default_label; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| return text_alternative; |
| } |
| |
| // 5.3 input type="image" |
| if (input_element && |
| input_element->getAttribute(typeAttr) == InputTypeNames::image) { |
| // alt attr |
| const AtomicString& alt = input_element->getAttribute(altAttr); |
| const bool is_empty = alt.IsEmpty() && !alt.IsNull(); |
| name_from = |
| is_empty ? kAXNameFromAttributeExplicitlyEmpty : kAXNameFromAttribute; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, altAttr)); |
| name_sources->back().type = name_from; |
| } |
| if (!alt.IsNull()) { |
| text_alternative = alt; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.attribute_value = alt; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| // value attr |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, valueAttr)); |
| name_sources->back().type = name_from; |
| } |
| name_from = kAXNameFromAttribute; |
| String value = input_element->value(); |
| if (!value.IsNull()) { |
| text_alternative = value; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| // localised default value ("Submit") |
| name_from = kAXNameFromValue; |
| text_alternative = input_element->GetLocale().QueryString( |
| WebLocalizedString::kSubmitButtonDefaultLabel); |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, typeAttr)); |
| NameSource& source = name_sources->back(); |
| source.attribute_value = input_element->getAttribute(typeAttr); |
| source.type = name_from; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| return text_alternative; |
| } |
| |
| // 5.1 Text inputs - step 3 (placeholder attribute) |
| if (html_element && html_element->IsTextControl()) { |
| name_from = kAXNameFromPlaceholder; |
| if (name_sources) { |
| name_sources->push_back( |
| NameSource(*found_text_alternative, placeholderAttr)); |
| NameSource& source = name_sources->back(); |
| source.type = name_from; |
| } |
| const String placeholder = PlaceholderFromNativeAttribute(); |
| if (!placeholder.IsEmpty()) { |
| text_alternative = placeholder; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| source.attribute_value = |
| html_element->FastGetAttribute(placeholderAttr); |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| // Also check for aria-placeholder. |
| name_from = kAXNameFromPlaceholder; |
| if (name_sources) { |
| name_sources->push_back( |
| NameSource(*found_text_alternative, aria_placeholderAttr)); |
| NameSource& source = name_sources->back(); |
| source.type = name_from; |
| } |
| const AtomicString& aria_placeholder = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kPlaceholder); |
| if (!aria_placeholder.IsEmpty()) { |
| text_alternative = aria_placeholder; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| source.attribute_value = aria_placeholder; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| return text_alternative; |
| } |
| |
| // 5.7 figure and figcaption Elements |
| if (GetNode()->HasTagName(figureTag)) { |
| // figcaption |
| name_from = kAXNameFromRelatedElement; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLFigcaption; |
| } |
| Element* figcaption = nullptr; |
| for (Element& element : ElementTraversal::DescendantsOf(*(GetNode()))) { |
| if (element.HasTagName(figcaptionTag)) { |
| figcaption = &element; |
| break; |
| } |
| } |
| if (figcaption) { |
| AXObject* figcaption_ax_object = AXObjectCache().GetOrCreate(figcaption); |
| if (figcaption_ax_object) { |
| text_alternative = |
| RecursiveTextAlternative(*figcaption_ax_object, false, visited); |
| |
| if (related_objects) { |
| local_related_objects.push_back(new NameSourceRelatedObject( |
| figcaption_ax_object, text_alternative)); |
| *related_objects = local_related_objects; |
| local_related_objects.clear(); |
| } |
| |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| return text_alternative; |
| } |
| |
| // 5.8 img or area Element |
| if (IsHTMLImageElement(GetNode()) || IsHTMLAreaElement(GetNode()) || |
| (GetLayoutObject() && GetLayoutObject()->IsSVGImage())) { |
| // alt |
| const AtomicString& alt = GetAttribute(altAttr); |
| const bool is_empty = alt.IsEmpty() && !alt.IsNull(); |
| name_from = |
| is_empty ? kAXNameFromAttributeExplicitlyEmpty : kAXNameFromAttribute; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, altAttr)); |
| name_sources->back().type = name_from; |
| } |
| if (!alt.IsNull()) { |
| text_alternative = alt; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.attribute_value = alt; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| return text_alternative; |
| } |
| |
| // 5.9 table Element |
| if (auto* table_element = ToHTMLTableElementOrNull(GetNode())) { |
| // caption |
| name_from = kAXNameFromCaption; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLTableCaption; |
| } |
| HTMLTableCaptionElement* caption = table_element->caption(); |
| if (caption) { |
| AXObject* caption_ax_object = AXObjectCache().GetOrCreate(caption); |
| if (caption_ax_object) { |
| text_alternative = |
| RecursiveTextAlternative(*caption_ax_object, false, visited); |
| if (related_objects) { |
| local_related_objects.push_back( |
| new NameSourceRelatedObject(caption_ax_object, text_alternative)); |
| *related_objects = local_related_objects; |
| local_related_objects.clear(); |
| } |
| |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| |
| // summary |
| name_from = kAXNameFromAttribute; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative, summaryAttr)); |
| name_sources->back().type = name_from; |
| } |
| const AtomicString& summary = GetAttribute(summaryAttr); |
| if (!summary.IsNull()) { |
| text_alternative = summary; |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.attribute_value = summary; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| |
| return text_alternative; |
| } |
| |
| // Per SVG AAM 1.0's modifications to 2D of this algorithm. |
| if (GetNode()->IsSVGElement()) { |
| name_from = kAXNameFromRelatedElement; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLTitleElement; |
| } |
| DCHECK(GetNode()->IsContainerNode()); |
| Element* title = ElementTraversal::FirstChild( |
| ToContainerNode(*(GetNode())), HasTagName(SVGNames::titleTag)); |
| |
| if (title) { |
| AXObject* title_ax_object = AXObjectCache().GetOrCreate(title); |
| if (title_ax_object && !visited.Contains(title_ax_object)) { |
| text_alternative = |
| RecursiveTextAlternative(*title_ax_object, false, visited); |
| if (related_objects) { |
| local_related_objects.push_back( |
| new NameSourceRelatedObject(title_ax_object, text_alternative)); |
| *related_objects = local_related_objects; |
| local_related_objects.clear(); |
| } |
| } |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| source.related_objects = *related_objects; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| |
| // Fieldset / legend. |
| if (IsHTMLFieldSetElement(GetNode())) { |
| name_from = kAXNameFromRelatedElement; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLLegend; |
| } |
| HTMLElement* legend = ToHTMLFieldSetElement(GetNode())->Legend(); |
| if (legend) { |
| AXObject* legend_ax_object = AXObjectCache().GetOrCreate(legend); |
| // Avoid an infinite loop |
| if (legend_ax_object && !visited.Contains(legend_ax_object)) { |
| text_alternative = |
| RecursiveTextAlternative(*legend_ax_object, false, visited); |
| |
| if (related_objects) { |
| local_related_objects.push_back( |
| new NameSourceRelatedObject(legend_ax_object, text_alternative)); |
| *related_objects = local_related_objects; |
| local_related_objects.clear(); |
| } |
| |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| } |
| |
| // Document. |
| if (IsWebArea()) { |
| Document* document = this->GetDocument(); |
| if (document) { |
| name_from = kAXNameFromAttribute; |
| if (name_sources) { |
| name_sources->push_back( |
| NameSource(found_text_alternative, aria_labelAttr)); |
| name_sources->back().type = name_from; |
| } |
| if (Element* document_element = document->documentElement()) { |
| const AtomicString& aria_label = |
| AccessibleNode::GetPropertyOrARIAAttribute( |
| document_element, AOMStringProperty::kLabel); |
| if (!aria_label.IsEmpty()) { |
| text_alternative = aria_label; |
| |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.text = text_alternative; |
| source.attribute_value = aria_label; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| |
| name_from = kAXNameFromRelatedElement; |
| if (name_sources) { |
| name_sources->push_back(NameSource(*found_text_alternative)); |
| name_sources->back().type = name_from; |
| name_sources->back().native_source = kAXTextFromNativeHTMLTitleElement; |
| } |
| |
| text_alternative = document->title(); |
| |
| Element* title_element = document->TitleElement(); |
| AXObject* title_ax_object = AXObjectCache().GetOrCreate(title_element); |
| if (title_ax_object) { |
| if (related_objects) { |
| local_related_objects.push_back( |
| new NameSourceRelatedObject(title_ax_object, text_alternative)); |
| *related_objects = local_related_objects; |
| local_related_objects.clear(); |
| } |
| |
| if (name_sources) { |
| NameSource& source = name_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = text_alternative; |
| *found_text_alternative = true; |
| } else { |
| return text_alternative; |
| } |
| } |
| } |
| } |
| |
| return text_alternative; |
| } |
| |
| String AXNodeObject::Description(AXNameFrom name_from, |
| AXDescriptionFrom& description_from, |
| AXObjectVector* description_objects) const { |
| AXRelatedObjectVector related_objects; |
| String result = |
| Description(name_from, description_from, nullptr, &related_objects); |
| if (description_objects) { |
| description_objects->clear(); |
| for (size_t i = 0; i < related_objects.size(); i++) |
| description_objects->push_back(related_objects[i]->object); |
| } |
| |
| result = CollapseWhitespace(result); |
| |
| if (RoleValue() == kSpinButtonRole && DatetimeAncestor()) { |
| // Fields inside a datetime control need to merge the field description |
| // with the description of the <input> element. |
| const AXObject* datetime_ancestor = DatetimeAncestor(); |
| AXNameFrom name_from; |
| datetime_ancestor->GetName(name_from, nullptr); |
| description_objects->clear(); |
| String ancestor_description = DatetimeAncestor()->Description( |
| name_from, description_from, description_objects); |
| if (!result.IsEmpty() && !ancestor_description.IsEmpty()) |
| return result + " " + ancestor_description; |
| if (!ancestor_description.IsEmpty()) |
| return ancestor_description; |
| } |
| |
| return result; |
| } |
| |
| // Based on |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html#accessible-name-and-description-calculation |
| String AXNodeObject::Description(AXNameFrom name_from, |
| AXDescriptionFrom& description_from, |
| DescriptionSources* description_sources, |
| AXRelatedObjectVector* related_objects) const { |
| // If descriptionSources is non-null, relatedObjects is used in filling it in, |
| // so it must be non-null as well. |
| if (description_sources) |
| DCHECK(related_objects); |
| |
| if (!GetNode()) |
| return String(); |
| |
| String description; |
| bool found_description = false; |
| |
| description_from = kAXDescriptionFromRelatedElement; |
| if (description_sources) { |
| description_sources->push_back( |
| DescriptionSource(found_description, aria_describedbyAttr)); |
| description_sources->back().type = description_from; |
| } |
| |
| // aria-describedby overrides any other accessible description, from: |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| // AOM version. |
| HeapVector<Member<Element>> elements; |
| if (HasAOMProperty(AOMRelationListProperty::kDescribedBy, elements)) { |
| AXObjectSet visited; |
| description = TextFromElements(true, visited, elements, related_objects); |
| if (!description.IsNull()) { |
| if (description_sources) { |
| DescriptionSource& source = description_sources->back(); |
| source.type = description_from; |
| source.related_objects = *related_objects; |
| source.text = description; |
| found_description = true; |
| } else { |
| return description; |
| } |
| } else if (description_sources) { |
| description_sources->back().invalid = true; |
| } |
| } |
| |
| // aria-describedby overrides any other accessible description, from: |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| const AtomicString& aria_describedby = GetAttribute(aria_describedbyAttr); |
| if (!aria_describedby.IsNull()) { |
| if (description_sources) |
| description_sources->back().attribute_value = aria_describedby; |
| |
| Vector<String> ids; |
| description = TextFromAriaDescribedby(related_objects, ids); |
| AXObjectCache().UpdateReverseRelations(this, ids); |
| |
| if (!description.IsNull()) { |
| if (description_sources) { |
| DescriptionSource& source = description_sources->back(); |
| source.type = description_from; |
| source.related_objects = *related_objects; |
| source.text = description; |
| found_description = true; |
| } else { |
| return description; |
| } |
| } else if (description_sources) { |
| description_sources->back().invalid = true; |
| } |
| } |
| |
| const HTMLInputElement* input_element = ToHTMLInputElementOrNull(GetNode()); |
| |
| // value, 5.2.2 from: http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| if (name_from != kAXNameFromValue && input_element && |
| input_element->IsTextButton()) { |
| description_from = kAXDescriptionFromAttribute; |
| if (description_sources) { |
| description_sources->push_back( |
| DescriptionSource(found_description, valueAttr)); |
| description_sources->back().type = description_from; |
| } |
| String value = input_element->value(); |
| if (!value.IsNull()) { |
| description = value; |
| if (description_sources) { |
| DescriptionSource& source = description_sources->back(); |
| source.text = description; |
| found_description = true; |
| } else { |
| return description; |
| } |
| } |
| } |
| |
| // table caption, 5.9.2 from: |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| if (name_from != kAXNameFromCaption && IsHTMLTableElement(GetNode())) { |
| HTMLTableElement* table_element = ToHTMLTableElement(GetNode()); |
| |
| description_from = kAXDescriptionFromRelatedElement; |
| if (description_sources) { |
| description_sources->push_back(DescriptionSource(found_description)); |
| description_sources->back().type = description_from; |
| description_sources->back().native_source = |
| kAXTextFromNativeHTMLTableCaption; |
| } |
| HTMLTableCaptionElement* caption = table_element->caption(); |
| if (caption) { |
| AXObject* caption_ax_object = AXObjectCache().GetOrCreate(caption); |
| if (caption_ax_object) { |
| AXObjectSet visited; |
| description = |
| RecursiveTextAlternative(*caption_ax_object, false, visited); |
| if (related_objects) |
| related_objects->push_back( |
| new NameSourceRelatedObject(caption_ax_object, description)); |
| |
| if (description_sources) { |
| DescriptionSource& source = description_sources->back(); |
| source.related_objects = *related_objects; |
| source.text = description; |
| found_description = true; |
| } else { |
| return description; |
| } |
| } |
| } |
| } |
| |
| // summary, 5.6.2 from: |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| if (name_from != kAXNameFromContents && IsHTMLSummaryElement(GetNode())) { |
| description_from = kAXDescriptionFromContents; |
| if (description_sources) { |
| description_sources->push_back(DescriptionSource(found_description)); |
| description_sources->back().type = description_from; |
| } |
| |
| AXObjectSet visited; |
| description = TextFromDescendants(visited, false); |
| |
| if (!description.IsEmpty()) { |
| if (description_sources) { |
| found_description = true; |
| description_sources->back().text = description; |
| } else { |
| return description; |
| } |
| } |
| } |
| |
| // title attribute, from: |
| // http://rawgit.com/w3c/aria/master/html-aam/html-aam.html |
| if (name_from != kAXNameFromTitle) { |
| description_from = kAXDescriptionFromAttribute; |
| if (description_sources) { |
| description_sources->push_back( |
| DescriptionSource(found_description, titleAttr)); |
| description_sources->back().type = description_from; |
| } |
| const AtomicString& title = GetAttribute(titleAttr); |
| if (!title.IsEmpty()) { |
| description = title; |
| if (description_sources) { |
| found_description = true; |
| description_sources->back().text = description; |
| } else { |
| return description; |
| } |
| } |
| } |
| |
| // aria-help. |
| // FIXME: this is not part of the official standard, but it's needed because |
| // the built-in date/time controls use it. |
| description_from = kAXDescriptionFromAttribute; |
| if (description_sources) { |
| description_sources->push_back( |
| DescriptionSource(found_description, aria_helpAttr)); |
| description_sources->back().type = description_from; |
| } |
| const AtomicString& help = GetAttribute(aria_helpAttr); |
| if (!help.IsEmpty()) { |
| description = help; |
| if (description_sources) { |
| found_description = true; |
| description_sources->back().text = description; |
| } else { |
| return description; |
| } |
| } |
| |
| description_from = kAXDescriptionFromUninitialized; |
| |
| if (found_description) { |
| for (size_t i = 0; i < description_sources->size(); ++i) { |
| if (!(*description_sources)[i].text.IsNull() && |
| !(*description_sources)[i].superseded) { |
| DescriptionSource& description_source = (*description_sources)[i]; |
| description_from = description_source.type; |
| if (!description_source.related_objects.IsEmpty()) |
| *related_objects = description_source.related_objects; |
| return description_source.text; |
| } |
| } |
| } |
| |
| return String(); |
| } |
| |
| String AXNodeObject::Placeholder(AXNameFrom name_from) const { |
| if (name_from == kAXNameFromPlaceholder) |
| return String(); |
| |
| Node* node = GetNode(); |
| if (!node || !node->IsHTMLElement()) |
| return String(); |
| |
| String native_placeholder = PlaceholderFromNativeAttribute(); |
| if (!native_placeholder.IsEmpty()) |
| return native_placeholder; |
| |
| const AtomicString& aria_placeholder = |
| GetAOMPropertyOrARIAAttribute(AOMStringProperty::kPlaceholder); |
| if (!aria_placeholder.IsEmpty()) |
| return aria_placeholder; |
| |
| return String(); |
| } |
| |
| String AXNodeObject::PlaceholderFromNativeAttribute() const { |
| Node* node = GetNode(); |
| if (!node || !blink::IsTextControl(*node)) |
| return String(); |
| return ToTextControl(node)->StrippedPlaceholder(); |
| } |
| |
| void AXNodeObject::Trace(blink::Visitor* visitor) { |
| visitor->Trace(node_); |
| AXObject::Trace(visitor); |
| } |
| |
| } // namespace blink |