| // Copyright 2015 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 <atlbase.h> |
| #include <atlcom.h> |
| #include <limits.h> |
| #include <oleacc.h> |
| #include <stdint.h> |
| |
| #include "base/containers/hash_tables.h" |
| #include "base/lazy_instance.h" |
| #include "base/win/scoped_comptr.h" |
| #include "base/win/scoped_variant.h" |
| #include "third_party/iaccessible2/ia2_api_all.h" |
| #include "ui/accessibility/ax_action_data.h" |
| #include "ui/accessibility/ax_node_data.h" |
| #include "ui/accessibility/ax_text_utils.h" |
| #include "ui/accessibility/platform/ax_platform_node_delegate.h" |
| #include "ui/accessibility/platform/ax_platform_node_win.h" |
| #include "ui/base/win/atl_module.h" |
| #include "ui/gfx/geometry/rect_conversions.h" |
| |
| // |
| // Macros to use at the top of any AXPlatformNodeWin function that implements |
| // a COM interface. Because COM objects are reference counted and clients |
| // are completely untrusted, it's important to always first check that our |
| // object is still valid, and then check that all pointer arguments are |
| // not NULL. |
| // |
| |
| #define COM_OBJECT_VALIDATE() \ |
| if (!delegate_) \ |
| return E_FAIL; |
| #define COM_OBJECT_VALIDATE_1_ARG(arg) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_2_ARGS(arg1, arg2) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_3_ARGS(arg1, arg2, arg3) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; \ |
| if (!arg3) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_4_ARGS(arg1, arg2, arg3, arg4) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; \ |
| if (!arg3) \ |
| return E_INVALIDARG; \ |
| if (!arg4) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_VAR_ID_AND_GET_TARGET(var_id, target) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| target = GetTargetFromChildID(var_id); \ |
| if (!target) \ |
| return E_INVALIDARG; \ |
| if (!target->delegate_) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, arg, target) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg) \ |
| return E_INVALIDARG; \ |
| target = GetTargetFromChildID(var_id); \ |
| if (!target) \ |
| return E_INVALIDARG; \ |
| if (!target->delegate_) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_VAR_ID_2_ARGS_AND_GET_TARGET(var_id, arg1, arg2, \ |
| target) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; \ |
| target = GetTargetFromChildID(var_id); \ |
| if (!target) \ |
| return E_INVALIDARG; \ |
| if (!target->delegate_) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_VAR_ID_3_ARGS_AND_GET_TARGET(var_id, arg1, arg2, \ |
| arg3, target) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; \ |
| if (!arg3) \ |
| return E_INVALIDARG; \ |
| target = GetTargetFromChildID(var_id); \ |
| if (!target) \ |
| return E_INVALIDARG; \ |
| if (!target->delegate_) \ |
| return E_INVALIDARG; |
| #define COM_OBJECT_VALIDATE_VAR_ID_4_ARGS_AND_GET_TARGET(var_id, arg1, arg2, \ |
| arg3, arg4, target) \ |
| if (!delegate_) \ |
| return E_FAIL; \ |
| if (!arg1) \ |
| return E_INVALIDARG; \ |
| if (!arg2) \ |
| return E_INVALIDARG; \ |
| if (!arg3) \ |
| return E_INVALIDARG; \ |
| if (!arg4) \ |
| return E_INVALIDARG; \ |
| target = GetTargetFromChildID(var_id); \ |
| if (!target) \ |
| return E_INVALIDARG; \ |
| if (!target->delegate_) \ |
| return E_INVALIDARG; |
| |
| namespace ui { |
| |
| namespace { |
| |
| typedef base::hash_set<AXPlatformNodeWin*> AXPlatformNodeWinSet; |
| // Set of all AXPlatformNodeWin objects that were the target of an |
| // alert event. |
| base::LazyInstance<AXPlatformNodeWinSet>::DestructorAtExit g_alert_targets = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| base::LazyInstance<base::ObserverList<IAccessible2UsageObserver>>:: |
| DestructorAtExit g_iaccessible2_usage_observer_list = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| // |
| // IAccessible2UsageObserver |
| // |
| |
| IAccessible2UsageObserver::IAccessible2UsageObserver() { |
| } |
| |
| IAccessible2UsageObserver::~IAccessible2UsageObserver() { |
| } |
| |
| // static |
| base::ObserverList<IAccessible2UsageObserver>& |
| GetIAccessible2UsageObserverList() { |
| return g_iaccessible2_usage_observer_list.Get(); |
| } |
| |
| // |
| // AXPlatformNode::Create |
| // |
| |
| // static |
| AXPlatformNode* AXPlatformNode::Create(AXPlatformNodeDelegate* delegate) { |
| // Make sure ATL is initialized in this module. |
| ui::win::CreateATLModuleIfNeeded(); |
| |
| CComObject<AXPlatformNodeWin>* instance = nullptr; |
| HRESULT hr = CComObject<AXPlatformNodeWin>::CreateInstance(&instance); |
| DCHECK(SUCCEEDED(hr)); |
| instance->Init(delegate); |
| instance->AddRef(); |
| return instance; |
| } |
| |
| // static |
| AXPlatformNode* AXPlatformNode::FromNativeViewAccessible( |
| gfx::NativeViewAccessible accessible) { |
| if (!accessible) |
| return nullptr; |
| base::win::ScopedComPtr<AXPlatformNodeWin> ax_platform_node; |
| accessible->QueryInterface(ax_platform_node.Receive()); |
| return ax_platform_node.Get(); |
| } |
| |
| // |
| // AXPlatformNodeWin |
| // |
| |
| AXPlatformNodeWin::AXPlatformNodeWin() { |
| } |
| |
| AXPlatformNodeWin::~AXPlatformNodeWin() { |
| } |
| |
| // |
| // AXPlatformNodeBase implementation. |
| // |
| |
| void AXPlatformNodeWin::Dispose() { |
| Release(); |
| } |
| |
| void AXPlatformNodeWin::Destroy() { |
| RemoveAlertTarget(); |
| AXPlatformNodeBase::Destroy(); |
| } |
| |
| // |
| // AXPlatformNode implementation. |
| // |
| |
| gfx::NativeViewAccessible AXPlatformNodeWin::GetNativeViewAccessible() { |
| return this; |
| } |
| |
| void AXPlatformNodeWin::NotifyAccessibilityEvent(ui::AXEvent event_type) { |
| HWND hwnd = delegate_->GetTargetForNativeAccessibilityEvent(); |
| if (!hwnd) |
| return; |
| |
| // Menu items fire selection events but Windows screen readers work reliably |
| // with focus events. Remap here. |
| if (event_type == ui::AX_EVENT_SELECTION && |
| GetData().role == ui::AX_ROLE_MENU_ITEM) |
| event_type = ui::AX_EVENT_FOCUS; |
| |
| int native_event = MSAAEvent(event_type); |
| if (native_event < EVENT_MIN) |
| return; |
| |
| ::NotifyWinEvent(native_event, hwnd, OBJID_CLIENT, -unique_id_); |
| |
| // Keep track of objects that are a target of an alert event. |
| if (event_type == ui::AX_EVENT_ALERT) |
| AddAlertTarget(); |
| } |
| |
| int AXPlatformNodeWin::GetIndexInParent() { |
| base::win::ScopedComPtr<IDispatch> parent_dispatch; |
| base::win::ScopedComPtr<IAccessible> parent_accessible; |
| if (S_OK != get_accParent(parent_dispatch.Receive())) |
| return -1; |
| if (S_OK != parent_dispatch.QueryInterface(parent_accessible.Receive())) |
| return -1; |
| |
| LONG child_count = 0; |
| if (S_OK != parent_accessible->get_accChildCount(&child_count)) |
| return -1; |
| for (LONG index = 1; index <= child_count; ++index) { |
| base::win::ScopedVariant childid_index(index); |
| base::win::ScopedComPtr<IDispatch> child_dispatch; |
| base::win::ScopedComPtr<IAccessible> child_accessible; |
| if (S_OK == parent_accessible->get_accChild(childid_index, |
| child_dispatch.Receive()) && |
| S_OK == child_dispatch.QueryInterface(child_accessible.Receive())) { |
| if (child_accessible.Get() == this) |
| return index - 1; |
| } |
| } |
| |
| return -1; |
| } |
| |
| // |
| // IAccessible implementation. |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::accHitTest( |
| LONG x_left, LONG y_top, VARIANT* child) { |
| COM_OBJECT_VALIDATE_1_ARG(child); |
| gfx::NativeViewAccessible hit_child = delegate_->HitTestSync(x_left, y_top); |
| if (!hit_child) { |
| child->vt = VT_EMPTY; |
| return S_FALSE; |
| } |
| |
| if (hit_child == this) { |
| // This object is the best match, so return CHILDID_SELF. It's tempting to |
| // simplify the logic and use VT_DISPATCH everywhere, but the Windows |
| // call AccessibleObjectFromPoint will keep calling accHitTest until some |
| // object returns CHILDID_SELF. |
| child->vt = VT_I4; |
| child->lVal = CHILDID_SELF; |
| return S_OK; |
| } |
| |
| // Call accHitTest recursively on the result, which may be a recursive call |
| // to this function or it may be overridden, for example in the case of a |
| // WebView. |
| HRESULT result = hit_child->accHitTest(x_left, y_top, child); |
| |
| // If the recursive call returned CHILDID_SELF, we have to convert that |
| // into a VT_DISPATCH for the return value to this call. |
| if (S_OK == result && child->vt == VT_I4 && child->lVal == CHILDID_SELF) { |
| child->vt = VT_DISPATCH; |
| child->pdispVal = hit_child; |
| // Always increment ref when returning a reference to a COM object. |
| child->pdispVal->AddRef(); |
| } |
| return result; |
| } |
| |
| HRESULT AXPlatformNodeWin::accDoDefaultAction(VARIANT var_id) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_AND_GET_TARGET(var_id, target); |
| AXActionData data; |
| data.action = ui::AX_ACTION_DO_DEFAULT; |
| |
| if (target->delegate_->AccessibilityPerformAction(data)) |
| return S_OK; |
| return E_FAIL; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::accLocation( |
| LONG* x_left, LONG* y_top, LONG* width, LONG* height, VARIANT var_id) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_4_ARGS_AND_GET_TARGET(var_id, x_left, y_top, width, |
| height, target); |
| |
| gfx::Rect bounds = target->delegate_->GetScreenBoundsRect(); |
| *x_left = bounds.x(); |
| *y_top = bounds.y(); |
| *width = bounds.width(); |
| *height = bounds.height(); |
| |
| if (bounds.IsEmpty()) |
| return S_FALSE; |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::accNavigate( |
| LONG nav_dir, VARIANT start, VARIANT* end) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(start, end, target); |
| IAccessible* result = nullptr; |
| |
| if ((nav_dir == NAVDIR_LASTCHILD || nav_dir == NAVDIR_FIRSTCHILD) && |
| start.lVal != CHILDID_SELF) { |
| // MSAA states that navigating to first/last child can only be from self. |
| return E_INVALIDARG; |
| } |
| |
| switch (nav_dir) { |
| case NAVDIR_DOWN: |
| case NAVDIR_UP: |
| case NAVDIR_LEFT: |
| case NAVDIR_RIGHT: |
| // These directions are not implemented, matching Mozilla and IE. |
| return E_NOTIMPL; |
| |
| case NAVDIR_FIRSTCHILD: |
| if (delegate_->GetChildCount() > 0) |
| result = delegate_->ChildAtIndex(0); |
| break; |
| |
| case NAVDIR_LASTCHILD: |
| if (delegate_->GetChildCount() > 0) |
| result = delegate_->ChildAtIndex(delegate_->GetChildCount() - 1); |
| break; |
| |
| case NAVDIR_NEXT: { |
| AXPlatformNodeBase* next = GetNextSibling(); |
| if (next) |
| result = next->GetNativeViewAccessible(); |
| break; |
| } |
| |
| case NAVDIR_PREVIOUS: { |
| AXPlatformNodeBase* previous = GetPreviousSibling(); |
| if (previous) |
| result = previous->GetNativeViewAccessible(); |
| break; |
| } |
| |
| default: |
| return E_INVALIDARG; |
| } |
| |
| if (!result) { |
| end->vt = VT_EMPTY; |
| return S_FALSE; |
| } |
| |
| end->vt = VT_DISPATCH; |
| end->pdispVal = result; |
| // Always increment ref when returning a reference to a COM object. |
| end->pdispVal->AddRef(); |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accChild(VARIANT var_child, |
| IDispatch** disp_child) { |
| *disp_child = nullptr; |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_AND_GET_TARGET(var_child, target); |
| |
| *disp_child = target; |
| (*disp_child)->AddRef(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accChildCount(LONG* child_count) { |
| COM_OBJECT_VALIDATE_1_ARG(child_count); |
| *child_count = delegate_->GetChildCount(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accDefaultAction( |
| VARIANT var_id, BSTR* def_action) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, def_action, target); |
| |
| int action; |
| if (!target->GetIntAttribute(AX_ATTR_ACTION, &action)) { |
| *def_action = nullptr; |
| return S_FALSE; |
| } |
| |
| base::string16 action_verb = |
| ActionToString(static_cast<AXSupportedAction>(action)); |
| if (action_verb.empty()) { |
| *def_action = nullptr; |
| return S_FALSE; |
| } |
| |
| *def_action = SysAllocString(action_verb.c_str()); |
| DCHECK(def_action); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accDescription( |
| VARIANT var_id, BSTR* desc) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, desc, target); |
| |
| return target->GetStringAttributeAsBstr(ui::AX_ATTR_DESCRIPTION, desc); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accFocus(VARIANT* focus_child) { |
| COM_OBJECT_VALIDATE_1_ARG(focus_child); |
| gfx::NativeViewAccessible focus_accessible = delegate_->GetFocus(); |
| if (focus_accessible == this) { |
| focus_child->vt = VT_I4; |
| focus_child->lVal = CHILDID_SELF; |
| } else if (focus_accessible) { |
| focus_child->vt = VT_DISPATCH; |
| focus_child->pdispVal = focus_accessible; |
| focus_child->pdispVal->AddRef(); |
| return S_OK; |
| } else { |
| focus_child->vt = VT_EMPTY; |
| } |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accKeyboardShortcut( |
| VARIANT var_id, BSTR* acc_key) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, acc_key, target); |
| |
| return target->GetStringAttributeAsBstr(ui::AX_ATTR_SHORTCUT, acc_key); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accName( |
| VARIANT var_id, BSTR* name) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, name, target); |
| |
| return target->GetStringAttributeAsBstr(ui::AX_ATTR_NAME, name); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accParent( |
| IDispatch** disp_parent) { |
| COM_OBJECT_VALIDATE_1_ARG(disp_parent); |
| *disp_parent = GetParent(); |
| if (*disp_parent) { |
| (*disp_parent)->AddRef(); |
| return S_OK; |
| } |
| |
| return S_FALSE; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accRole( |
| VARIANT var_id, VARIANT* role) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, role, target); |
| role->vt = VT_I4; |
| role->lVal = target->MSAARole(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accState( |
| VARIANT var_id, VARIANT* state) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, state, target); |
| state->vt = VT_I4; |
| state->lVal = target->MSAAState(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accHelp( |
| VARIANT var_id, BSTR* help) { |
| return S_FALSE; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accValue(VARIANT var_id, BSTR* value) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, value, target); |
| return target->GetStringAttributeAsBstr(ui::AX_ATTR_VALUE, value); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::put_accValue(VARIANT var_id, |
| BSTR new_value) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_AND_GET_TARGET(var_id, target); |
| |
| AXActionData data; |
| data.action = ui::AX_ACTION_SET_VALUE; |
| data.value = new_value; |
| if (target->delegate_->AccessibilityPerformAction(data)) |
| return S_OK; |
| return E_FAIL; |
| } |
| |
| // IAccessible functions not supported. |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accSelection(VARIANT* selected) { |
| COM_OBJECT_VALIDATE_1_ARG(selected); |
| if (selected) |
| selected->vt = VT_EMPTY; |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::accSelect( |
| LONG flagsSelect, VARIANT var_id) { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_accHelpTopic( |
| BSTR* help_file, VARIANT var_id, LONG* topic_id) { |
| AXPlatformNodeWin* target; |
| COM_OBJECT_VALIDATE_VAR_ID_2_ARGS_AND_GET_TARGET(var_id, help_file, topic_id, |
| target); |
| if (help_file) { |
| *help_file = nullptr; |
| } |
| if (topic_id) { |
| *topic_id = static_cast<LONG>(-1); |
| } |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::put_accName( |
| VARIANT var_id, BSTR put_name) { |
| // Deprecated. |
| return E_NOTIMPL; |
| } |
| |
| // |
| // IAccessible2 implementation. |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::role(LONG* role) { |
| COM_OBJECT_VALIDATE_1_ARG(role); |
| *role = MSAARole(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_states(AccessibleStates* states) { |
| COM_OBJECT_VALIDATE_1_ARG(states); |
| // There are only a couple of states we need to support |
| // in IAccessible2. If any more are added, we may want to |
| // add a helper function like MSAAState. |
| *states = IA2_STATE_OPAQUE; |
| if (GetData().state & (1 << ui::AX_STATE_EDITABLE)) |
| *states |= IA2_STATE_EDITABLE; |
| if (GetData().state & (1 << ui::AX_STATE_VERTICAL)) |
| *states |= IA2_STATE_VERTICAL; |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_uniqueID(LONG* unique_id) { |
| COM_OBJECT_VALIDATE_1_ARG(unique_id); |
| *unique_id = -unique_id_; |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_windowHandle(HWND* window_handle) { |
| COM_OBJECT_VALIDATE_1_ARG(window_handle); |
| *window_handle = delegate_->GetTargetForNativeAccessibilityEvent(); |
| return *window_handle ? S_OK : S_FALSE; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_relationTargetsOfType( |
| BSTR type_bstr, |
| long max_targets, |
| IUnknown ***targets, |
| long *n_targets) { |
| COM_OBJECT_VALIDATE_2_ARGS(targets, n_targets); |
| |
| *n_targets = 0; |
| *targets = nullptr; |
| |
| // Only respond to requests for relations of type "alerts". |
| base::string16 type(type_bstr); |
| if (type != L"alerts") |
| return S_FALSE; |
| |
| // Collect all of the objects that have had an alert fired on them that |
| // are a descendant of this object. |
| std::vector<AXPlatformNodeWin*> alert_targets; |
| for (auto iter = g_alert_targets.Get().begin(); |
| iter != g_alert_targets.Get().end(); |
| ++iter) { |
| AXPlatformNodeWin* target = *iter; |
| if (IsDescendant(target)) |
| alert_targets.push_back(target); |
| } |
| |
| long count = static_cast<long>(alert_targets.size()); |
| if (count == 0) |
| return S_FALSE; |
| |
| // Don't return more targets than max_targets - but note that the caller |
| // is allowed to specify max_targets=0 to mean no limit. |
| if (max_targets > 0 && count > max_targets) |
| count = max_targets; |
| |
| // Return the number of targets. |
| *n_targets = count; |
| |
| // Allocate COM memory for the result array and populate it. |
| *targets = static_cast<IUnknown**>( |
| CoTaskMemAlloc(count * sizeof(IUnknown*))); |
| for (long i = 0; i < count; ++i) { |
| (*targets)[i] = static_cast<IAccessible*>(alert_targets[i]); |
| (*targets)[i]->AddRef(); |
| } |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_attributes(BSTR* attributes) { |
| COM_OBJECT_VALIDATE_1_ARG(attributes); |
| base::string16 attributes_str; |
| |
| // Text fields need to report the attribute "text-model:a1" to instruct |
| // screen readers to use IAccessible2 APIs to handle text editing in this |
| // object (as opposed to treating it like a native Windows text box). |
| // The text-model:a1 attribute is documented here: |
| // http://www.linuxfoundation.org/collaborate/workgroups/accessibility/ia2/ia2_implementation_guide |
| if (GetData().role == ui::AX_ROLE_TEXT_FIELD) { |
| attributes_str = L"text-model:a1;"; |
| } |
| |
| *attributes = SysAllocString(attributes_str.c_str()); |
| DCHECK(*attributes); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_indexInParent(LONG* index_in_parent) { |
| COM_OBJECT_VALIDATE_1_ARG(index_in_parent); |
| *index_in_parent = GetIndexInParent(); |
| if (*index_in_parent < 0) |
| return E_FAIL; |
| |
| return S_OK; |
| } |
| |
| // |
| // IAccessible2 methods not implemented. |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::get_attribute(BSTR name, VARIANT* attribute) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_extendedRole(BSTR* extended_role) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_nRelations(LONG* n_relations) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_relation(LONG relation_index, |
| IAccessibleRelation** relation) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_relations(LONG max_relations, |
| IAccessibleRelation** relations, |
| LONG* n_relations) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::scrollTo(enum IA2ScrollType scroll_type) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::scrollToPoint( |
| enum IA2CoordinateType coordinate_type, |
| LONG x, |
| LONG y) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_groupPosition(LONG* group_level, |
| LONG* similar_items_in_group, |
| LONG* position_in_group) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_localizedExtendedRole( |
| BSTR* localized_extended_role) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_nExtendedStates(LONG* n_extended_states) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_extendedStates(LONG max_extended_states, |
| BSTR** extended_states, |
| LONG* n_extended_states) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_localizedExtendedStates( |
| LONG max_localized_extended_states, |
| BSTR** localized_extended_states, |
| LONG* n_localized_extended_states) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_locale(IA2Locale* locale) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_accessibleWithCaret(IUnknown** accessible, |
| long* caret_offset) { |
| return E_NOTIMPL; |
| } |
| |
| // |
| // IAccessibleText |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::get_nCharacters(LONG* n_characters) { |
| COM_OBJECT_VALIDATE_1_ARG(n_characters); |
| base::string16 text = TextForIAccessibleText(); |
| *n_characters = static_cast<LONG>(text.size()); |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_caretOffset(LONG* offset) { |
| COM_OBJECT_VALIDATE_1_ARG(offset); |
| *offset = static_cast<LONG>(GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END)); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_nSelections(LONG* n_selections) { |
| COM_OBJECT_VALIDATE_1_ARG(n_selections); |
| int sel_start = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START); |
| int sel_end = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END); |
| if (sel_start != sel_end) |
| *n_selections = 1; |
| else |
| *n_selections = 0; |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_selection(LONG selection_index, |
| LONG* start_offset, |
| LONG* end_offset) { |
| COM_OBJECT_VALIDATE_2_ARGS(start_offset, end_offset); |
| if (selection_index != 0) |
| return E_INVALIDARG; |
| |
| *start_offset = static_cast<LONG>( |
| GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START)); |
| *end_offset = static_cast<LONG>( |
| GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END)); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_text(LONG start_offset, |
| LONG end_offset, |
| BSTR* text) { |
| COM_OBJECT_VALIDATE_1_ARG(text); |
| int sel_end = GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START); |
| base::string16 text_str = TextForIAccessibleText(); |
| LONG len = static_cast<LONG>(text_str.size()); |
| |
| if (start_offset == IA2_TEXT_OFFSET_LENGTH) { |
| start_offset = len; |
| } else if (start_offset == IA2_TEXT_OFFSET_CARET) { |
| start_offset = static_cast<LONG>(sel_end); |
| } |
| if (end_offset == IA2_TEXT_OFFSET_LENGTH) { |
| end_offset = static_cast<LONG>(text_str.size()); |
| } else if (end_offset == IA2_TEXT_OFFSET_CARET) { |
| end_offset = static_cast<LONG>(sel_end); |
| } |
| |
| // The spec allows the arguments to be reversed. |
| if (start_offset > end_offset) { |
| LONG tmp = start_offset; |
| start_offset = end_offset; |
| end_offset = tmp; |
| } |
| |
| // The spec does not allow the start or end offsets to be out or range; |
| // we must return an error if so. |
| if (start_offset < 0) |
| return E_INVALIDARG; |
| if (end_offset > len) |
| return E_INVALIDARG; |
| |
| base::string16 substr = |
| text_str.substr(start_offset, end_offset - start_offset); |
| if (substr.empty()) |
| return S_FALSE; |
| |
| *text = SysAllocString(substr.c_str()); |
| DCHECK(*text); |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_textAtOffset( |
| LONG offset, |
| enum IA2TextBoundaryType boundary_type, |
| LONG* start_offset, LONG* end_offset, |
| BSTR* text) { |
| COM_OBJECT_VALIDATE_3_ARGS(start_offset, end_offset, text); |
| // The IAccessible2 spec says we don't have to implement the "sentence" |
| // boundary type, we can just let the screen reader handle it. |
| if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { |
| *start_offset = 0; |
| *end_offset = 0; |
| *text = nullptr; |
| return S_FALSE; |
| } |
| |
| const base::string16& text_str = TextForIAccessibleText(); |
| |
| *start_offset = FindBoundary( |
| text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION); |
| *end_offset = FindBoundary( |
| text_str, boundary_type, offset, ui::FORWARDS_DIRECTION); |
| return get_text(*start_offset, *end_offset, text); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_textBeforeOffset( |
| LONG offset, |
| enum IA2TextBoundaryType boundary_type, |
| LONG* start_offset, LONG* end_offset, |
| BSTR* text) { |
| if (!start_offset || !end_offset || !text) |
| return E_INVALIDARG; |
| |
| // The IAccessible2 spec says we don't have to implement the "sentence" |
| // boundary type, we can just let the screenreader handle it. |
| if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { |
| *start_offset = 0; |
| *end_offset = 0; |
| *text = nullptr; |
| return S_FALSE; |
| } |
| |
| const base::string16& text_str = TextForIAccessibleText(); |
| |
| *start_offset = FindBoundary( |
| text_str, boundary_type, offset, ui::BACKWARDS_DIRECTION); |
| *end_offset = offset; |
| return get_text(*start_offset, *end_offset, text); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_textAfterOffset( |
| LONG offset, |
| enum IA2TextBoundaryType boundary_type, |
| LONG* start_offset, LONG* end_offset, |
| BSTR* text) { |
| if (!start_offset || !end_offset || !text) |
| return E_INVALIDARG; |
| |
| // The IAccessible2 spec says we don't have to implement the "sentence" |
| // boundary type, we can just let the screenreader handle it. |
| if (boundary_type == IA2_TEXT_BOUNDARY_SENTENCE) { |
| *start_offset = 0; |
| *end_offset = 0; |
| *text = nullptr; |
| return S_FALSE; |
| } |
| |
| const base::string16& text_str = TextForIAccessibleText(); |
| |
| *start_offset = offset; |
| *end_offset = FindBoundary( |
| text_str, boundary_type, offset, ui::FORWARDS_DIRECTION); |
| return get_text(*start_offset, *end_offset, text); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::get_offsetAtPoint( |
| LONG x, LONG y, enum IA2CoordinateType coord_type, LONG* offset) { |
| COM_OBJECT_VALIDATE_1_ARG(offset); |
| // We don't support this method, but we have to return something |
| // rather than E_NOTIMPL or screen readers will complain. |
| *offset = 0; |
| return S_OK; |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::addSelection(LONG start_offset, |
| LONG end_offset) { |
| // We only support one selection. |
| return setSelection(0, start_offset, end_offset); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::removeSelection(LONG selection_index) { |
| if (selection_index != 0) |
| return E_INVALIDARG; |
| // Simply collapse the selection to the position of the caret if a caret is |
| // visible, otherwise set the selection to 0. |
| return setCaretOffset(GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END)); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::setCaretOffset(LONG offset) { |
| return setSelection(0, offset, offset); |
| } |
| |
| STDMETHODIMP AXPlatformNodeWin::setSelection(LONG selection_index, |
| LONG start_offset, |
| LONG end_offset) { |
| if (selection_index != 0) |
| return E_INVALIDARG; |
| |
| HandleSpecialTextOffset(&start_offset); |
| HandleSpecialTextOffset(&end_offset); |
| if (start_offset < 0 || |
| start_offset > static_cast<LONG>(TextForIAccessibleText().length())) { |
| return E_INVALIDARG; |
| } |
| if (end_offset < 0 || |
| end_offset > static_cast<LONG>(TextForIAccessibleText().length())) { |
| return E_INVALIDARG; |
| } |
| |
| if (SetTextSelection(static_cast<int>(start_offset), |
| static_cast<int>(end_offset))) { |
| return S_OK; |
| } |
| return E_FAIL; |
| } |
| |
| // |
| // IAccessibleText methods not implemented. |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::get_newText(IA2TextSegment* new_text) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_oldText(IA2TextSegment* old_text) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_characterExtents( |
| LONG offset, |
| enum IA2CoordinateType coord_type, |
| LONG* x, |
| LONG* y, |
| LONG* width, |
| LONG* height) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::scrollSubstringTo( |
| LONG start_index, |
| LONG end_index, |
| enum IA2ScrollType scroll_type) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::scrollSubstringToPoint( |
| LONG start_index, |
| LONG end_index, |
| enum IA2CoordinateType coordinate_type, |
| LONG x, |
| LONG y) { |
| return E_NOTIMPL; |
| } |
| STDMETHODIMP AXPlatformNodeWin::get_attributes(LONG offset, |
| LONG* start_offset, |
| LONG* end_offset, |
| BSTR* text_attributes) { |
| return E_NOTIMPL; |
| } |
| |
| // |
| // IServiceProvider implementation. |
| // |
| |
| STDMETHODIMP AXPlatformNodeWin::QueryService( |
| REFGUID guidService, REFIID riid, void** object) { |
| COM_OBJECT_VALIDATE_1_ARG(object); |
| |
| if (riid == IID_IAccessible2) { |
| for (IAccessible2UsageObserver& observer : |
| GetIAccessible2UsageObserverList()) { |
| observer.OnIAccessible2Used(); |
| } |
| } |
| |
| if (guidService == IID_IAccessible || |
| guidService == IID_IAccessible2 || |
| guidService == IID_IAccessible2_2 || |
| guidService == IID_IAccessibleText) { |
| return QueryInterface(riid, object); |
| } |
| |
| *object = nullptr; |
| return E_FAIL; |
| } |
| |
| // |
| // Private member functions. |
| // |
| int AXPlatformNodeWin::MSAARole() { |
| switch (GetData().role) { |
| case ui::AX_ROLE_ALERT: |
| return ROLE_SYSTEM_ALERT; |
| case ui::AX_ROLE_APPLICATION: |
| return ROLE_SYSTEM_APPLICATION; |
| case ui::AX_ROLE_BUTTON_DROP_DOWN: |
| return ROLE_SYSTEM_BUTTONDROPDOWN; |
| case ui::AX_ROLE_POP_UP_BUTTON: |
| return ROLE_SYSTEM_BUTTONMENU; |
| case ui::AX_ROLE_CHECK_BOX: |
| return ROLE_SYSTEM_CHECKBUTTON; |
| case ui::AX_ROLE_COMBO_BOX: |
| return ROLE_SYSTEM_COMBOBOX; |
| case ui::AX_ROLE_DIALOG: |
| return ROLE_SYSTEM_DIALOG; |
| case ui::AX_ROLE_GROUP: |
| return ROLE_SYSTEM_GROUPING; |
| case ui::AX_ROLE_IMAGE: |
| return ROLE_SYSTEM_GRAPHIC; |
| case ui::AX_ROLE_LINK: |
| return ROLE_SYSTEM_LINK; |
| case ui::AX_ROLE_LOCATION_BAR: |
| return ROLE_SYSTEM_GROUPING; |
| case ui::AX_ROLE_MENU_BAR: |
| return ROLE_SYSTEM_MENUBAR; |
| case ui::AX_ROLE_MENU_ITEM: |
| return ROLE_SYSTEM_MENUITEM; |
| case ui::AX_ROLE_MENU_LIST_POPUP: |
| return ROLE_SYSTEM_MENUPOPUP; |
| case ui::AX_ROLE_TREE: |
| return ROLE_SYSTEM_OUTLINE; |
| case ui::AX_ROLE_TREE_ITEM: |
| return ROLE_SYSTEM_OUTLINEITEM; |
| case ui::AX_ROLE_TAB: |
| return ROLE_SYSTEM_PAGETAB; |
| case ui::AX_ROLE_TAB_LIST: |
| return ROLE_SYSTEM_PAGETABLIST; |
| case ui::AX_ROLE_PANE: |
| return ROLE_SYSTEM_PANE; |
| case ui::AX_ROLE_PROGRESS_INDICATOR: |
| return ROLE_SYSTEM_PROGRESSBAR; |
| case ui::AX_ROLE_BUTTON: |
| return ROLE_SYSTEM_PUSHBUTTON; |
| case ui::AX_ROLE_RADIO_BUTTON: |
| return ROLE_SYSTEM_RADIOBUTTON; |
| case ui::AX_ROLE_SCROLL_BAR: |
| return ROLE_SYSTEM_SCROLLBAR; |
| case ui::AX_ROLE_SPLITTER: |
| return ROLE_SYSTEM_SEPARATOR; |
| case ui::AX_ROLE_SLIDER: |
| return ROLE_SYSTEM_SLIDER; |
| case ui::AX_ROLE_STATIC_TEXT: |
| return ROLE_SYSTEM_STATICTEXT; |
| case ui::AX_ROLE_TEXT_FIELD: |
| return ROLE_SYSTEM_TEXT; |
| case ui::AX_ROLE_TITLE_BAR: |
| return ROLE_SYSTEM_TITLEBAR; |
| case ui::AX_ROLE_TOOLBAR: |
| return ROLE_SYSTEM_TOOLBAR; |
| case ui::AX_ROLE_WEB_VIEW: |
| return ROLE_SYSTEM_GROUPING; |
| case ui::AX_ROLE_WINDOW: |
| return ROLE_SYSTEM_WINDOW; |
| case ui::AX_ROLE_CLIENT: |
| default: |
| // This is the default role for MSAA. |
| return ROLE_SYSTEM_CLIENT; |
| } |
| } |
| |
| int AXPlatformNodeWin::MSAAState() { |
| const AXNodeData& data = GetData(); |
| const uint32_t state = data.state; |
| |
| int msaa_state = 0; |
| if (state & (1 << ui::AX_STATE_COLLAPSED)) |
| msaa_state |= STATE_SYSTEM_COLLAPSED; |
| if (state & (1 << ui::AX_STATE_DEFAULT)) |
| msaa_state |= STATE_SYSTEM_DEFAULT; |
| if (state & (1 << ui::AX_STATE_EXPANDED)) |
| msaa_state |= STATE_SYSTEM_EXPANDED; |
| if (state & (1 << ui::AX_STATE_FOCUSABLE)) |
| msaa_state |= STATE_SYSTEM_FOCUSABLE; |
| if (state & (1 << ui::AX_STATE_HASPOPUP)) |
| msaa_state |= STATE_SYSTEM_HASPOPUP; |
| if (state & (1 << ui::AX_STATE_HOVERED)) |
| msaa_state |= STATE_SYSTEM_HOTTRACKED; |
| if (state & (1 << ui::AX_STATE_INVISIBLE)) |
| msaa_state |= STATE_SYSTEM_INVISIBLE; |
| if (state & (1 << ui::AX_STATE_LINKED)) |
| msaa_state |= STATE_SYSTEM_LINKED; |
| if (state & (1 << ui::AX_STATE_OFFSCREEN)) |
| msaa_state |= STATE_SYSTEM_OFFSCREEN; |
| if (state & (1 << ui::AX_STATE_PRESSED)) |
| msaa_state |= STATE_SYSTEM_PRESSED; |
| if (state & (1 << ui::AX_STATE_PROTECTED)) |
| msaa_state |= STATE_SYSTEM_PROTECTED; |
| if (state & (1 << ui::AX_STATE_READ_ONLY)) |
| msaa_state |= STATE_SYSTEM_READONLY; |
| if (state & (1 << ui::AX_STATE_SELECTABLE)) |
| msaa_state |= STATE_SYSTEM_SELECTABLE; |
| if (state & (1 << ui::AX_STATE_SELECTED)) |
| msaa_state |= STATE_SYSTEM_SELECTED; |
| if (state & (1 << ui::AX_STATE_DISABLED)) |
| msaa_state |= STATE_SYSTEM_UNAVAILABLE; |
| |
| // Checked state |
| const auto checked_state = static_cast<ui::AXCheckedState>( |
| GetIntAttribute(ui::AX_ATTR_CHECKED_STATE)); |
| switch (checked_state) { |
| case ui::AX_CHECKED_STATE_TRUE: |
| msaa_state |= STATE_SYSTEM_CHECKED; |
| break; |
| case ui::AX_CHECKED_STATE_MIXED: |
| msaa_state |= STATE_SYSTEM_MIXED; |
| break; |
| default: |
| break; |
| } |
| |
| gfx::NativeViewAccessible focus = delegate_->GetFocus(); |
| if (focus == GetNativeViewAccessible()) |
| msaa_state |= STATE_SYSTEM_FOCUSED; |
| |
| // On Windows, the "focus" bit should be set on certain containers, like |
| // menu bars, when visible. |
| // |
| // TODO(dmazzoni): this should probably check if focus is actually inside |
| // the menu bar, but we don't currently track focus inside menu pop-ups, |
| // and Chrome only has one menu visible at a time so this works for now. |
| if (data.role == ui::AX_ROLE_MENU_BAR && |
| !(state & (1 << ui::AX_STATE_INVISIBLE))) { |
| msaa_state |= STATE_SYSTEM_FOCUSED; |
| } |
| |
| return msaa_state; |
| } |
| |
| int AXPlatformNodeWin::MSAAEvent(ui::AXEvent event) { |
| switch (event) { |
| case ui::AX_EVENT_ALERT: |
| return EVENT_SYSTEM_ALERT; |
| case ui::AX_EVENT_FOCUS: |
| return EVENT_OBJECT_FOCUS; |
| case ui::AX_EVENT_MENU_START: |
| return EVENT_SYSTEM_MENUSTART; |
| case ui::AX_EVENT_MENU_END: |
| return EVENT_SYSTEM_MENUEND; |
| case ui::AX_EVENT_MENU_POPUP_START: |
| return EVENT_SYSTEM_MENUPOPUPSTART; |
| case ui::AX_EVENT_MENU_POPUP_END: |
| return EVENT_SYSTEM_MENUPOPUPEND; |
| case ui::AX_EVENT_SELECTION: |
| return EVENT_OBJECT_SELECTION; |
| case ui::AX_EVENT_SELECTION_ADD: |
| return EVENT_OBJECT_SELECTIONADD; |
| case ui::AX_EVENT_SELECTION_REMOVE: |
| return EVENT_OBJECT_SELECTIONREMOVE; |
| case ui::AX_EVENT_TEXT_CHANGED: |
| return EVENT_OBJECT_NAMECHANGE; |
| case ui::AX_EVENT_TEXT_SELECTION_CHANGED: |
| return IA2_EVENT_TEXT_CARET_MOVED; |
| case ui::AX_EVENT_VALUE_CHANGED: |
| return EVENT_OBJECT_VALUECHANGE; |
| default: |
| return -1; |
| } |
| } |
| |
| HRESULT AXPlatformNodeWin::GetStringAttributeAsBstr( |
| ui::AXStringAttribute attribute, |
| BSTR* value_bstr) const { |
| base::string16 str; |
| |
| if (!GetString16Attribute(attribute, &str)) |
| return S_FALSE; |
| |
| if (str.empty()) |
| return S_FALSE; |
| |
| *value_bstr = SysAllocString(str.c_str()); |
| DCHECK(*value_bstr); |
| |
| return S_OK; |
| } |
| |
| void AXPlatformNodeWin::AddAlertTarget() { |
| g_alert_targets.Get().insert(this); |
| } |
| |
| void AXPlatformNodeWin::RemoveAlertTarget() { |
| if (g_alert_targets.Get().find(this) != g_alert_targets.Get().end()) |
| g_alert_targets.Get().erase(this); |
| } |
| |
| base::string16 AXPlatformNodeWin::TextForIAccessibleText() { |
| if (GetData().role == ui::AX_ROLE_TEXT_FIELD) |
| return GetString16Attribute(ui::AX_ATTR_VALUE); |
| return GetString16Attribute(ui::AX_ATTR_NAME); |
| } |
| |
| void AXPlatformNodeWin::HandleSpecialTextOffset(LONG* offset) { |
| if (*offset == IA2_TEXT_OFFSET_LENGTH) { |
| *offset = static_cast<LONG>(TextForIAccessibleText().length()); |
| } else if (*offset == IA2_TEXT_OFFSET_CARET) { |
| get_caretOffset(offset); |
| } |
| } |
| |
| ui::TextBoundaryType AXPlatformNodeWin::IA2TextBoundaryToTextBoundary( |
| IA2TextBoundaryType ia2_boundary) { |
| switch(ia2_boundary) { |
| case IA2_TEXT_BOUNDARY_CHAR: return ui::CHAR_BOUNDARY; |
| case IA2_TEXT_BOUNDARY_WORD: return ui::WORD_BOUNDARY; |
| case IA2_TEXT_BOUNDARY_LINE: return ui::LINE_BOUNDARY; |
| case IA2_TEXT_BOUNDARY_SENTENCE: return ui::SENTENCE_BOUNDARY; |
| case IA2_TEXT_BOUNDARY_PARAGRAPH: return ui::PARAGRAPH_BOUNDARY; |
| case IA2_TEXT_BOUNDARY_ALL: return ui::ALL_BOUNDARY; |
| default: |
| NOTREACHED(); |
| return ui::CHAR_BOUNDARY; |
| } |
| } |
| |
| LONG AXPlatformNodeWin::FindBoundary( |
| const base::string16& text, |
| IA2TextBoundaryType ia2_boundary, |
| LONG start_offset, |
| ui::TextBoundaryDirection direction) { |
| HandleSpecialTextOffset(&start_offset); |
| ui::TextBoundaryType boundary = IA2TextBoundaryToTextBoundary(ia2_boundary); |
| std::vector<int32_t> line_breaks; |
| return static_cast<LONG>(ui::FindAccessibleTextBoundary( |
| text, line_breaks, boundary, start_offset, direction, |
| AX_TEXT_AFFINITY_DOWNSTREAM)); |
| } |
| |
| AXPlatformNodeWin* AXPlatformNodeWin::GetTargetFromChildID( |
| const VARIANT& var_id) { |
| LONG child_id = V_I4(&var_id); |
| if (child_id == CHILDID_SELF) { |
| return this; |
| } |
| |
| if (child_id >= 1 && child_id <= delegate_->GetChildCount()) { |
| // Positive child ids are a 1-based child index, used by clients |
| // that want to enumerate all immediate children. |
| AXPlatformNodeBase* base = |
| FromNativeViewAccessible(delegate_->ChildAtIndex(child_id - 1)); |
| return static_cast<AXPlatformNodeWin*>(base); |
| } |
| |
| if (child_id >= 0) |
| return nullptr; |
| |
| // Negative child ids can be used to map to any descendant. |
| AXPlatformNode* node = GetFromUniqueId(-child_id); |
| if (!node) |
| return nullptr; |
| |
| AXPlatformNodeBase* base = |
| FromNativeViewAccessible(node->GetNativeViewAccessible()); |
| if (base && !IsDescendant(base)) |
| base = nullptr; |
| |
| return static_cast<AXPlatformNodeWin*>(base); |
| } |
| |
| } // namespace ui |
