| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "content/browser/accessibility/browser_accessibility_manager_win.h" |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <set> |
| #include <vector> |
| |
| #include "base/command_line.h" |
| #include "base/stl_util.h" |
| #include "base/win/scoped_variant.h" |
| #include "base/win/windows_version.h" |
| #include "content/browser/accessibility/browser_accessibility_state_impl.h" |
| #include "content/browser/accessibility/browser_accessibility_win.h" |
| #include "content/browser/renderer_host/legacy_render_widget_host_win.h" |
| #include "content/public/common/content_switches.h" |
| #include "content/public/common/use_zoom_for_dsf_policy.h" |
| #include "ui/accessibility/accessibility_switches.h" |
| #include "ui/accessibility/ax_role_properties.h" |
| #include "ui/accessibility/platform/ax_fragment_root_win.h" |
| #include "ui/accessibility/platform/ax_platform_node_delegate_utils_win.h" |
| #include "ui/accessibility/platform/uia_registrar_win.h" |
| #include "ui/base/win/atl_module.h" |
| |
| namespace content { |
| |
| // static |
| BrowserAccessibilityManager* BrowserAccessibilityManager::Create( |
| const ui::AXTreeUpdate& initial_tree, |
| BrowserAccessibilityDelegate* delegate) { |
| return new BrowserAccessibilityManagerWin(initial_tree, delegate); |
| } |
| |
| BrowserAccessibilityManagerWin* |
| BrowserAccessibilityManager::ToBrowserAccessibilityManagerWin() { |
| return static_cast<BrowserAccessibilityManagerWin*>(this); |
| } |
| |
| BrowserAccessibilityManagerWin::BrowserAccessibilityManagerWin( |
| const ui::AXTreeUpdate& initial_tree, |
| BrowserAccessibilityDelegate* delegate) |
| : BrowserAccessibilityManager(delegate), load_complete_pending_(false) { |
| ui::win::CreateATLModuleIfNeeded(); |
| Initialize(initial_tree); |
| } |
| |
| BrowserAccessibilityManagerWin::~BrowserAccessibilityManagerWin() = default; |
| |
| // static |
| ui::AXTreeUpdate BrowserAccessibilityManagerWin::GetEmptyDocument() { |
| ui::AXNodeData empty_document; |
| empty_document.id = 1; |
| empty_document.role = ax::mojom::Role::kRootWebArea; |
| empty_document.AddBoolAttribute(ax::mojom::BoolAttribute::kBusy, true); |
| ui::AXTreeUpdate update; |
| update.root_id = empty_document.id; |
| update.nodes.push_back(empty_document); |
| return update; |
| } |
| |
| HWND BrowserAccessibilityManagerWin::GetParentHWND() { |
| BrowserAccessibilityDelegate* delegate = GetDelegateFromRootManager(); |
| if (!delegate) |
| return NULL; |
| return delegate->AccessibilityGetAcceleratedWidget(); |
| } |
| |
| void BrowserAccessibilityManagerWin::UserIsReloading() { |
| if (GetRoot()) |
| FireWinAccessibilityEvent(IA2_EVENT_DOCUMENT_RELOAD, GetRoot()); |
| } |
| |
| BrowserAccessibility* BrowserAccessibilityManagerWin::GetFocus() const { |
| BrowserAccessibility* focus = BrowserAccessibilityManager::GetFocus(); |
| return GetActiveDescendant(focus); |
| } |
| |
| void BrowserAccessibilityManagerWin::FireFocusEvent( |
| BrowserAccessibility* node) { |
| BrowserAccessibilityManager::FireFocusEvent(node); |
| DCHECK(node); |
| FireWinAccessibilityEvent(EVENT_OBJECT_FOCUS, node); |
| FireUiaAccessibilityEvent(UIA_AutomationFocusChangedEventId, node); |
| } |
| |
| void BrowserAccessibilityManagerWin::FireBlinkEvent( |
| ax::mojom::Event event_type, |
| BrowserAccessibility* node) { |
| BrowserAccessibilityManager::FireBlinkEvent(event_type, node); |
| switch (event_type) { |
| case ax::mojom::Event::kClicked: |
| if (node->GetData().IsInvocable()) |
| FireUiaAccessibilityEvent(UIA_Invoke_InvokedEventId, node); |
| break; |
| case ax::mojom::Event::kEndOfTest: |
| // Event tests use kEndOfTest as a sentinel to mark the end of the test. |
| FireUiaAccessibilityEvent( |
| ui::UiaRegistrarWin::GetInstance().GetUiaTestCompleteEventId(), node); |
| break; |
| case ax::mojom::Event::kLocationChanged: |
| FireWinAccessibilityEvent(IA2_EVENT_VISIBLE_DATA_CHANGED, node); |
| break; |
| case ax::mojom::Event::kScrolledToAnchor: |
| FireWinAccessibilityEvent(EVENT_SYSTEM_SCROLLINGSTART, node); |
| break; |
| case ax::mojom::Event::kTextChanged: |
| FireUiaTextContainerEvent(UIA_Text_TextChangedEventId, node); |
| break; |
| case ax::mojom::Event::kTextSelectionChanged: |
| text_selection_changed_events_.insert(node); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::FireGeneratedEvent( |
| ui::AXEventGenerator::Event event_type, |
| BrowserAccessibility* node) { |
| BrowserAccessibilityManager::FireGeneratedEvent(event_type, node); |
| bool can_fire_events = CanFireEvents(); |
| |
| if (event_type == ui::AXEventGenerator::Event::LOAD_COMPLETE && |
| can_fire_events) |
| load_complete_pending_ = false; |
| |
| if (load_complete_pending_ && can_fire_events && GetRoot()) { |
| load_complete_pending_ = false; |
| FireWinAccessibilityEvent(IA2_EVENT_DOCUMENT_LOAD_COMPLETE, GetRoot()); |
| } |
| |
| if (!can_fire_events && !load_complete_pending_ && |
| event_type == ui::AXEventGenerator::Event::LOAD_COMPLETE && GetRoot() && |
| !GetRoot()->IsOffscreen() && GetRoot()->PlatformChildCount() > 0) { |
| load_complete_pending_ = true; |
| } |
| |
| switch (event_type) { |
| case ui::AXEventGenerator::Event::ACCESS_KEY_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_AccessKeyPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::ACTIVE_DESCENDANT_CHANGED: |
| FireWinAccessibilityEvent(IA2_EVENT_ACTIVE_DESCENDANT_CHANGED, node); |
| break; |
| case ui::AXEventGenerator::Event::ALERT: |
| FireWinAccessibilityEvent(EVENT_SYSTEM_ALERT, node); |
| FireUiaAccessibilityEvent(UIA_SystemAlertEventId, node); |
| break; |
| case ui::AXEventGenerator::Event::ATOMIC_CHANGED: |
| case ui::AXEventGenerator::Event::BUSY_CHANGED: |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::CHECKED_STATE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_ToggleToggleStatePropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::CHILDREN_CHANGED: { |
| // If this node is ignored, fire the event on the platform parent since |
| // ignored nodes cannot raise events. |
| BrowserAccessibility* target_node = |
| node->IsIgnored() ? node->PlatformGetParent() : node; |
| if (target_node) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_REORDER, target_node); |
| FireUiaStructureChangedEvent(StructureChangeType_ChildrenReordered, |
| target_node); |
| } |
| break; |
| } |
| case ui::AXEventGenerator::Event::CLASS_NAME_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_ClassNamePropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::COLLAPSED: |
| case ui::AXEventGenerator::Event::EXPANDED: |
| FireUiaPropertyChangedEvent( |
| UIA_ExpandCollapseExpandCollapseStatePropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::CONTROLS_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_ControllerForPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::DESCRIBED_BY_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_DescribedByPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::DESCRIPTION_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_FullDescriptionPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::DOCUMENT_SELECTION_CHANGED: { |
| // Fire the event on the object where the focus of the selection is. |
| int32_t focus_id = ax_tree()->GetUnignoredSelection().focus_object_id; |
| BrowserAccessibility* focus_object = GetFromID(focus_id); |
| if (focus_object && focus_object->HasVisibleCaretOrSelection()) { |
| FireWinAccessibilityEvent(IA2_EVENT_TEXT_CARET_MOVED, focus_object); |
| text_selection_changed_events_.insert(node); |
| } |
| break; |
| } |
| // aria-dropeffect is deprecated in WAI-ARIA 1.1. |
| case ui::AXEventGenerator::Event::DROPEFFECT_CHANGED: |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::ENABLED_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_IsEnabledPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::FLOW_FROM_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_FlowsFromPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::FLOW_TO_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_FlowsToPropertyId, node); |
| break; |
| // aria-grabbed is deprecated in WAI-ARIA 1.1. |
| case ui::AXEventGenerator::Event::GRABBED_CHANGED: |
| case ui::AXEventGenerator::Event::HASPOPUP_CHANGED: |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::HIERARCHICAL_LEVEL_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_LevelPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::IGNORED_CHANGED: |
| if (node->IsIgnored()) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_HIDE, node); |
| FireUiaStructureChangedEvent(StructureChangeType_ChildRemoved, node); |
| if (node->GetRole() == ax::mojom::Role::kMenu) { |
| FireWinAccessibilityEvent(EVENT_SYSTEM_MENUPOPUPEND, node); |
| FireUiaAccessibilityEvent(UIA_MenuClosedEventId, node); |
| } |
| } |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::IMAGE_ANNOTATION_CHANGED: |
| FireWinAccessibilityEvent(EVENT_OBJECT_NAMECHANGE, node); |
| break; |
| case ui::AXEventGenerator::Event::INVALID_STATUS_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_IsDataValidForFormPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::KEY_SHORTCUTS_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_AcceleratorKeyPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::LABELED_BY_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_LabeledByPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::LANGUAGE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_CulturePropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::LIVE_REGION_CREATED: |
| FireUiaAccessibilityEvent(UIA_LiveRegionChangedEventId, node); |
| break; |
| case ui::AXEventGenerator::Event::LIVE_REGION_CHANGED: |
| // This event is redundant with the IA2_EVENT_TEXT_INSERTED events; |
| // however, JAWS 2018 and earlier do not process the text inserted |
| // events when "virtual cursor mode" is turned off (Insert+Z). |
| // Fortunately, firing the redudant event does not cause duplicate |
| // verbalizations in either screen reader. |
| // Future versions of JAWS may process the text inserted event when |
| // in focus mode, and so at some point the live region |
| // changed events may truly become redundant with the text inserted |
| // events. Note: Firefox does not fire this event, but JAWS processes |
| // Firefox live region events differently (utilizes MSAA's |
| // EVENT_OBJECT_SHOW). |
| FireWinAccessibilityEvent(EVENT_OBJECT_LIVEREGIONCHANGED, node); |
| FireUiaAccessibilityEvent(UIA_LiveRegionChangedEventId, node); |
| break; |
| case ui::AXEventGenerator::Event::LIVE_STATUS_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_LiveSettingPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::LOAD_COMPLETE: |
| FireWinAccessibilityEvent(IA2_EVENT_DOCUMENT_LOAD_COMPLETE, node); |
| break; |
| case ui::AXEventGenerator::Event::LAYOUT_INVALIDATED: |
| FireUiaAccessibilityEvent(UIA_LayoutInvalidatedEventId, node); |
| break; |
| case ui::AXEventGenerator::Event::LIVE_RELEVANT_CHANGED: |
| case ui::AXEventGenerator::Event::MULTILINE_STATE_CHANGED: |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::MULTISELECTABLE_STATE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_SelectionCanSelectMultiplePropertyId, |
| node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::NAME_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_NamePropertyId, node); |
| // Only fire name changes when the name comes from an attribute, otherwise |
| // name changes are redundant with text removed/inserted events. |
| if (node->GetData().GetNameFrom() != ax::mojom::NameFrom::kContents) |
| FireWinAccessibilityEvent(EVENT_OBJECT_NAMECHANGE, node); |
| break; |
| case ui::AXEventGenerator::Event::PLACEHOLDER_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_HelpTextPropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::POSITION_IN_SET_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_PositionInSetPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::READONLY_CHANGED: |
| if (node->GetData().IsRangeValueSupported()) |
| FireUiaPropertyChangedEvent(UIA_RangeValueIsReadOnlyPropertyId, node); |
| else if (ui::IsValuePatternSupported(node)) |
| FireUiaPropertyChangedEvent(UIA_ValueIsReadOnlyPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::REQUIRED_STATE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_IsRequiredForFormPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::ROLE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_AriaRolePropertyId, node); |
| break; |
| case ui::AXEventGenerator::Event::SCROLL_HORIZONTAL_POSITION_CHANGED: |
| FireWinAccessibilityEvent(EVENT_SYSTEM_SCROLLINGEND, node); |
| FireUiaPropertyChangedEvent(UIA_ScrollHorizontalScrollPercentPropertyId, |
| node); |
| break; |
| case ui::AXEventGenerator::Event::SCROLL_VERTICAL_POSITION_CHANGED: |
| FireWinAccessibilityEvent(EVENT_SYSTEM_SCROLLINGEND, node); |
| FireUiaPropertyChangedEvent(UIA_ScrollVerticalScrollPercentPropertyId, |
| node); |
| break; |
| case ui::AXEventGenerator::Event::SELECTED_CHANGED: |
| HandleSelectedStateChanged(node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::SELECTED_CHILDREN_CHANGED: |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTIONWITHIN, node); |
| break; |
| case ui::AXEventGenerator::Event::SET_SIZE_CHANGED: |
| FireUiaPropertyChangedEvent(UIA_SizeOfSetPropertyId, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::SORT_CHANGED: |
| FireWinAccessibilityEvent(IA2_EVENT_OBJECT_ATTRIBUTE_CHANGED, node); |
| aria_properties_events_.insert(node); |
| break; |
| case ui::AXEventGenerator::Event::SUBTREE_CREATED: |
| FireWinAccessibilityEvent(EVENT_OBJECT_SHOW, node); |
| FireUiaStructureChangedEvent(StructureChangeType_ChildAdded, node); |
| if (node->GetRole() == ax::mojom::Role::kMenu) { |
| FireWinAccessibilityEvent(EVENT_SYSTEM_MENUPOPUPSTART, node); |
| FireUiaAccessibilityEvent(UIA_MenuOpenedEventId, node); |
| } |
| break; |
| case ui::AXEventGenerator::Event::VALUE_CHANGED: |
| FireWinAccessibilityEvent(EVENT_OBJECT_VALUECHANGE, node); |
| if (node->GetData().IsRangeValueSupported()) { |
| FireUiaPropertyChangedEvent(UIA_RangeValueValuePropertyId, node); |
| aria_properties_events_.insert(node); |
| } else if (ui::IsValuePatternSupported(node)) { |
| FireUiaPropertyChangedEvent(UIA_ValueValuePropertyId, node); |
| FireUiaTextContainerEvent(UIA_Text_TextChangedEventId, node); |
| } |
| break; |
| case ui::AXEventGenerator::Event::VALUE_MAX_CHANGED: |
| if (node->GetData().IsRangeValueSupported()) { |
| FireUiaPropertyChangedEvent(UIA_RangeValueMaximumPropertyId, node); |
| aria_properties_events_.insert(node); |
| } |
| break; |
| case ui::AXEventGenerator::Event::VALUE_MIN_CHANGED: |
| if (node->GetData().IsRangeValueSupported()) { |
| FireUiaPropertyChangedEvent(UIA_RangeValueMinimumPropertyId, node); |
| aria_properties_events_.insert(node); |
| } |
| break; |
| case ui::AXEventGenerator::Event::VALUE_STEP_CHANGED: |
| if (node->GetData().IsRangeValueSupported()) { |
| FireUiaPropertyChangedEvent(UIA_RangeValueSmallChangePropertyId, node); |
| FireUiaPropertyChangedEvent(UIA_RangeValueLargeChangePropertyId, node); |
| } |
| break; |
| case ui::AXEventGenerator::Event::AUTO_COMPLETE_CHANGED: |
| case ui::AXEventGenerator::Event::DOCUMENT_TITLE_CHANGED: |
| case ui::AXEventGenerator::Event::FOCUS_CHANGED: |
| case ui::AXEventGenerator::Event::LIVE_REGION_NODE_CHANGED: |
| case ui::AXEventGenerator::Event::LOAD_START: |
| case ui::AXEventGenerator::Event::PORTAL_ACTIVATED: |
| case ui::AXEventGenerator::Event::MENU_ITEM_SELECTED: |
| case ui::AXEventGenerator::Event::OTHER_ATTRIBUTE_CHANGED: |
| case ui::AXEventGenerator::Event::RELATED_NODE_CHANGED: |
| case ui::AXEventGenerator::Event::ROW_COUNT_CHANGED: |
| case ui::AXEventGenerator::Event::STATE_CHANGED: |
| // There are some notifications that aren't meaningful on Windows. |
| // It's okay to skip them. |
| break; |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::FireWinAccessibilityEvent( |
| LONG win_event_type, |
| BrowserAccessibility* node) { |
| if (!ShouldFireEventForNode(node)) |
| return; |
| // Suppress events when |IGNORED_CHANGED| except for related SHOW / HIDE. |
| // Also include MENUPOPUPSTART / MENUPOPUPEND since a change in the ignored |
| // state may show / hide a popup by exposing it to the tree or not. |
| // Also include focus events since a node may become visible at the same time |
| // it receives focus It's never good to suppress a po |
| if (base::Contains(ignored_changed_nodes_, node)) { |
| switch (win_event_type) { |
| case EVENT_OBJECT_HIDE: |
| case EVENT_OBJECT_SHOW: |
| case EVENT_OBJECT_FOCUS: |
| case EVENT_SYSTEM_MENUPOPUPEND: |
| case EVENT_SYSTEM_MENUPOPUPSTART: |
| break; |
| default: |
| return; |
| } |
| } else if (node->IsIgnored()) { |
| return; |
| } |
| |
| HWND hwnd = GetParentHWND(); |
| if (!hwnd) |
| return; |
| |
| // Pass the negation of this node's unique id in the |child_id| |
| // argument to NotifyWinEvent; the AT client will then call get_accChild |
| // on the HWND's accessibility object and pass it that same id, which |
| // we can use to retrieve the IAccessible for this node. |
| LONG child_id = -(ToBrowserAccessibilityWin(node)->GetCOM()->GetUniqueId()); |
| ::NotifyWinEvent(win_event_type, hwnd, OBJID_CLIENT, child_id); |
| } |
| |
| void BrowserAccessibilityManagerWin::FireUiaAccessibilityEvent( |
| LONG uia_event, |
| BrowserAccessibility* node) { |
| if (!::switches::IsExperimentalAccessibilityPlatformUIAEnabled()) |
| return; |
| if (!ShouldFireEventForNode(node)) |
| return; |
| // Suppress events when |IGNORED_CHANGED| except for MenuClosed / MenuOpen |
| // since a change in the ignored state may show / hide a popup by exposing |
| // it to the tree or not. |
| if (base::Contains(ignored_changed_nodes_, node)) { |
| switch (uia_event) { |
| case UIA_MenuClosedEventId: |
| case UIA_MenuOpenedEventId: |
| break; |
| default: |
| return; |
| } |
| } else if (node->IsIgnored()) { |
| return; |
| } |
| |
| ::UiaRaiseAutomationEvent(ToBrowserAccessibilityWin(node)->GetCOM(), |
| uia_event); |
| } |
| |
| void BrowserAccessibilityManagerWin::FireUiaPropertyChangedEvent( |
| LONG uia_property, |
| BrowserAccessibility* node) { |
| if (!::switches::IsExperimentalAccessibilityPlatformUIAEnabled()) |
| return; |
| if (!ShouldFireEventForNode(node)) |
| return; |
| // Suppress events when |IGNORED_CHANGED| with the exception for firing |
| // UIA_AriaPropertiesPropertyId-hidden event on non-text node marked as |
| // ignored. |
| if (node->IsIgnored() || base::Contains(ignored_changed_nodes_, node)) { |
| if (uia_property != UIA_AriaPropertiesPropertyId || |
| node->IsTextOnlyObject()) |
| return; |
| } |
| |
| // The old value is not used by the system |
| VARIANT old_value = {}; |
| old_value.vt = VT_EMPTY; |
| |
| auto* provider = ToBrowserAccessibilityWin(node)->GetCOM(); |
| base::win::ScopedVariant new_value; |
| if (SUCCEEDED( |
| provider->GetPropertyValueImpl(uia_property, new_value.Receive()))) { |
| ::UiaRaiseAutomationPropertyChangedEvent(provider, uia_property, old_value, |
| new_value); |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::FireUiaStructureChangedEvent( |
| StructureChangeType change_type, |
| BrowserAccessibility* node) { |
| if (!::switches::IsExperimentalAccessibilityPlatformUIAEnabled()) |
| return; |
| if (!ShouldFireEventForNode(node)) |
| return; |
| // Suppress events when |IGNORED_CHANGED| except for related structure changes |
| if (base::Contains(ignored_changed_nodes_, node)) { |
| switch (change_type) { |
| case StructureChangeType_ChildRemoved: |
| case StructureChangeType_ChildAdded: |
| break; |
| default: |
| return; |
| } |
| } else if (node->IsIgnored()) { |
| return; |
| } |
| |
| auto* provider = ToBrowserAccessibilityWin(node); |
| auto* provider_com = provider ? provider->GetCOM() : nullptr; |
| if (!provider || !provider_com) |
| return; |
| |
| switch (change_type) { |
| case StructureChangeType_ChildRemoved: { |
| // 'ChildRemoved' fires on the parent and provides the runtime ID of |
| // the removed child (which was passed as |node|). |
| auto* parent = ToBrowserAccessibilityWin(node->PlatformGetParent()); |
| auto* parent_com = parent ? parent->GetCOM() : nullptr; |
| if (parent && parent_com) { |
| ui::AXPlatformNodeWin::RuntimeIdArray runtime_id; |
| provider_com->GetRuntimeIdArray(runtime_id); |
| UiaRaiseStructureChangedEvent(parent_com, change_type, |
| runtime_id.data(), runtime_id.size()); |
| } |
| break; |
| } |
| |
| default: { |
| // All other types are fired on |node|. For 'ChildAdded' |node| is the |
| // child that was added; for other types, it's the parent container. |
| UiaRaiseStructureChangedEvent(provider_com, change_type, nullptr, 0); |
| } |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::FireUiaTextContainerEvent( |
| LONG uia_event, |
| BrowserAccessibility* node) { |
| // If the node supports text pattern, fire the event from itself, otherwise, |
| // fire the event from the closest ancestor that supports text pattern. |
| while (node) { |
| if (ToBrowserAccessibilityWin(node)->GetCOM()->IsPatternProviderSupported( |
| UIA_TextPatternId)) { |
| FireUiaAccessibilityEvent(uia_event, node); |
| return; |
| } |
| node = node->PlatformGetParent(); |
| } |
| } |
| |
| bool BrowserAccessibilityManagerWin::CanFireEvents() const { |
| return BrowserAccessibilityManager::CanFireEvents() && |
| GetDelegateFromRootManager() && |
| GetDelegateFromRootManager()->AccessibilityGetAcceleratedWidget(); |
| } |
| |
| gfx::Rect BrowserAccessibilityManagerWin::GetViewBoundsInScreenCoordinates() |
| const { |
| // We have to take the device scale factor into account on Windows. |
| BrowserAccessibilityDelegate* delegate = GetDelegateFromRootManager(); |
| if (delegate) { |
| gfx::Rect bounds = delegate->AccessibilityGetViewBounds(); |
| |
| // http://www.chromium.org/developers/design-documents/blink-coordinate-spaces |
| // The bounds returned by the delegate are always in device-independent |
| // pixels (DIPs), meaning physical pixels divided by device scale factor |
| // (DSF). However, if UseZoomForDSF is enabled, then Blink does not apply |
| // DSF when going from physical to screen pixels. In that case, we need to |
| // multiply DSF back in to get to Blink's notion of "screen pixels." |
| if (IsUseZoomForDSFEnabled() && device_scale_factor() > 0.0 && |
| device_scale_factor() != 1.0) { |
| bounds = ScaleToEnclosingRect(bounds, device_scale_factor()); |
| } |
| return bounds; |
| } |
| return gfx::Rect(); |
| } |
| |
| void BrowserAccessibilityManagerWin::OnSubtreeWillBeDeleted(ui::AXTree* tree, |
| ui::AXNode* node) { |
| BrowserAccessibility* obj = GetFromAXNode(node); |
| DCHECK(obj); |
| if (obj) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_HIDE, obj); |
| FireUiaStructureChangedEvent(StructureChangeType_ChildRemoved, obj); |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::OnNodeWillBeDeleted(ui::AXTree* tree, |
| ui::AXNode* node) { |
| if (node->data().role == ax::mojom::Role::kMenu) { |
| BrowserAccessibility* obj = GetFromAXNode(node); |
| DCHECK(obj); |
| FireWinAccessibilityEvent(EVENT_SYSTEM_MENUPOPUPEND, obj); |
| FireUiaAccessibilityEvent(UIA_MenuClosedEventId, obj); |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::OnAtomicUpdateFinished( |
| ui::AXTree* tree, |
| bool root_changed, |
| const std::vector<ui::AXTreeObserver::Change>& changes) { |
| BrowserAccessibilityManager::OnAtomicUpdateFinished(tree, root_changed, |
| changes); |
| |
| // Do a sequence of Windows-specific updates on each node. Each one is |
| // done in a single pass that must complete before the next step starts. |
| // The nodes that need to be updated are all of the nodes that were changed, |
| // plus some parents. |
| std::set<ui::AXPlatformNode*> objs_to_update; |
| CollectChangedNodesAndParentsForAtomicUpdate(tree, changes, &objs_to_update); |
| |
| // The first step moves win_attributes_ to old_win_attributes_ and then |
| // recomputes all of win_attributes_ other than IAccessibleText. |
| for (auto* node : objs_to_update) { |
| static_cast<BrowserAccessibilityComWin*>(node) |
| ->UpdateStep1ComputeWinAttributes(); |
| } |
| |
| // The next step updates the hypertext of each node, which is a |
| // concatenation of all of its child text nodes, so it can't run until |
| // the text of all of the nodes was computed in the previous step. |
| for (auto* node : objs_to_update) { |
| static_cast<BrowserAccessibilityComWin*>(node) |
| ->UpdateStep2ComputeHypertext(); |
| } |
| |
| // The third step fires events on nodes based on what's changed - like |
| // if the name, value, or description changed, or if the hypertext had |
| // text inserted or removed. It's able to figure out exactly what changed |
| // because we still have old_win_attributes_ populated. |
| // This step has to run after the previous two steps complete because the |
| // client may walk the tree when it receives any of these events. |
| // At the end, it deletes old_win_attributes_ since they're not needed |
| // anymore. |
| for (auto* node : objs_to_update) { |
| static_cast<BrowserAccessibilityComWin*>(node)->UpdateStep3FireEvents(); |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::HandleSelectedStateChanged( |
| BrowserAccessibility* node) { |
| const bool is_selected = |
| node->GetBoolAttribute(ax::mojom::BoolAttribute::kSelected); |
| |
| // Nodes that have selection container may support multiselect, for such nodes |
| // we add them to |selection_events_|, which FinalizeAccessibilityEvents |
| // handles selection item events firing. |
| // For nodes that do not have selection container, only single select is |
| // supported, selection item events firing are handled here. |
| if (auto* selection_container = node->PlatformGetSelectionContainer()) { |
| if (is_selected) { |
| selection_events_[selection_container].added.push_back(node); |
| } else { |
| selection_events_[selection_container].removed.push_back(node); |
| } |
| } else { |
| if (is_selected) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTION, node); |
| FireUiaAccessibilityEvent(UIA_SelectionItem_ElementSelectedEventId, node); |
| } else { |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTIONREMOVE, node); |
| FireUiaAccessibilityEvent( |
| UIA_SelectionItem_ElementRemovedFromSelectionEventId, node); |
| } |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::BeforeAccessibilityEvents() { |
| BrowserAccessibilityManager::BeforeAccessibilityEvents(); |
| |
| for (const auto& targeted_event : event_generator()) { |
| if (targeted_event.event_params.event == |
| ui::AXEventGenerator::Event::IGNORED_CHANGED) { |
| BrowserAccessibility* event_target = GetFromAXNode(targeted_event.node); |
| if (!event_target) |
| continue; |
| |
| const auto insert_pair = ignored_changed_nodes_.insert(event_target); |
| |
| // Expect that |IGNORED_CHANGED| only fires once for a given |
| // node in a given event frame. |
| DCHECK(insert_pair.second); |
| } |
| } |
| } |
| |
| void BrowserAccessibilityManagerWin::FinalizeAccessibilityEvents() { |
| BrowserAccessibilityManager::FinalizeAccessibilityEvents(); |
| |
| // Finalize aria properties events. |
| for (auto&& event_node : aria_properties_events_) { |
| FireUiaPropertyChangedEvent(UIA_AriaPropertiesPropertyId, event_node); |
| } |
| aria_properties_events_.clear(); |
| |
| // Finalize text selection events. |
| for (auto&& sel_event_node : text_selection_changed_events_) { |
| FireUiaTextContainerEvent(UIA_Text_TextSelectionChangedEventId, |
| sel_event_node); |
| } |
| text_selection_changed_events_.clear(); |
| |
| // Finalize selection item events. |
| for (auto&& selected : selection_events_) { |
| auto* container = selected.first; |
| auto&& changes = selected.second; |
| |
| // Count the number of selected items |
| size_t selected_count = 0; |
| BrowserAccessibility* first_selected_child = nullptr; |
| for (auto it = container->InternalChildrenBegin(); |
| it != container->InternalChildrenEnd(); ++it) { |
| auto* child = it.get(); |
| if (child->GetBoolAttribute(ax::mojom::BoolAttribute::kSelected)) { |
| if (!first_selected_child) |
| first_selected_child = child; |
| selected_count++; |
| } |
| } |
| |
| if (selected_count == 1) { |
| // Fire 'ElementSelected' on the only selected child |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTION, first_selected_child); |
| FireUiaAccessibilityEvent(UIA_SelectionItem_ElementSelectedEventId, |
| first_selected_child); |
| } else { |
| // Per UIA documentation, beyond the "invalidate limit" we're supposed to |
| // fire a 'SelectionInvalidated' event. The exact value isn't specified, |
| // but System.Windows.Automation.Provider uses a value of 20. |
| static const size_t kInvalidateLimit = 20; |
| if ((changes.added.size() + changes.removed.size()) > kInvalidateLimit) { |
| FireUiaAccessibilityEvent(UIA_Selection_InvalidatedEventId, container); |
| } else { |
| for (auto* item : changes.added) { |
| if (container->HasState(ax::mojom::State::kMultiselectable)) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTIONADD, item); |
| FireUiaAccessibilityEvent( |
| UIA_SelectionItem_ElementAddedToSelectionEventId, item); |
| } else { |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTION, item); |
| FireUiaAccessibilityEvent(UIA_SelectionItem_ElementSelectedEventId, |
| item); |
| } |
| } |
| for (auto* item : changes.removed) { |
| FireWinAccessibilityEvent(EVENT_OBJECT_SELECTIONREMOVE, item); |
| FireUiaAccessibilityEvent( |
| UIA_SelectionItem_ElementRemovedFromSelectionEventId, item); |
| } |
| } |
| } |
| } |
| selection_events_.clear(); |
| ignored_changed_nodes_.clear(); |
| } |
| |
| BrowserAccessibilityManagerWin::SelectionEvents::SelectionEvents() = default; |
| BrowserAccessibilityManagerWin::SelectionEvents::~SelectionEvents() = default; |
| |
| } // namespace content |
