Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / UIAutomation / UIAutomationClient / System / Windows / Automation / AutomationElement.cs / 1 / AutomationElement.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: Main class used by Automation clients, represents a UI element
//
// History:
// 02/06/2003 : BrendanM Created
//
//---------------------------------------------------------------------------
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System;
using System.Runtime.Serialization;
using System.Security.Permissions;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.ComponentModel;
using MS.Win32;
using MS.Internal.Automation;
using System.Runtime.InteropServices;
#if EVENT_TRACING_PROPERTY
using Microsoft.Win32.Diagnostics;
#endif
// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
namespace System.Windows.Automation
{
///
/// Represents an element in the UIAutomation tree.
///
#if (INTERNAL_COMPILE)
internal sealed class AutomationElement //: IDisposable
#else
public sealed class AutomationElement
#endif
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Private ctor, used mostly by CacheHelper when reconstructing AutomationElements from
// a CacheResponse.
internal AutomationElement(SafeNodeHandle hnode, object[,] cachedValues, int cachedValuesIndex, UiaCoreApi.UiaCacheRequest request)
{
_hnode = hnode; // Can be IntPtr.Zero for a lightweight object
_cachedValues = cachedValues; // Can be null if there are no cached properties for this node
_cachedValuesIndex = cachedValuesIndex;
_request = request;
// Set RuntimeId (if available; 'as int[]' filters out AutomationElement.NotAvailable)
_runtimeId = LookupCachedValue(AutomationElement.RuntimeIdProperty, false, true) as int[];
//
// One scenario that allows for null runtimeID - doing UpdatedCache() on a node and asking only
// for children - gives us back a placeholder node that only has valid .CachedChildren,
// the node itself doesn't have any cached properties or a node.
// Since null is a valid value for these, we need another value to
// indicate that they were not requested - it's a bit obscure, but
// 'this' works well here, since these can never have it as legal value.
_cachedParent = this;
_cachedFirstChild = this;
_cachedNextSibling = this;
}
///
/// Overrides Object.Finalize
///
~AutomationElement()
{
//
}
// Used by methods that return non-cached AutomationElements - examples currently include
// AutomationElements returned as properties (SelecitonContainer, RowHeaders).
internal static AutomationElement Wrap(SafeNodeHandle hnode)
{
if (hnode == null || hnode.IsInvalid)
{
return null;
}
return new AutomationElement(hnode, null, 0, null);
}
#endregion Constructors
//------------------------------------------------------
//
// Public Constants / Readonly Fields
//
//-----------------------------------------------------
#region Public Constants and Readonly Fields
///
/// Indicates that a element does not support the requested value
///
public static readonly object NotSupported = AutomationElementIdentifiers.NotSupported;
/// Property ID: Indicates that this element should be included in the Control view of the tree
public static readonly AutomationProperty IsControlElementProperty = AutomationElementIdentifiers.IsControlElementProperty;
/// Property ID: The ControlType of this Element
public static readonly AutomationProperty ControlTypeProperty = AutomationElementIdentifiers.ControlTypeProperty;
/// Property ID: NativeWindowHandle - Window Handle, if the underlying control is a Window
public static readonly AutomationProperty IsContentElementProperty = AutomationElementIdentifiers.IsContentElementProperty;
/// Property ID: The AutomationElement that labels this element
public static readonly AutomationProperty LabeledByProperty = AutomationElementIdentifiers.LabeledByProperty;
/// Property ID: NativeWindowHandle - Window Handle, if the underlying control is a Window
public static readonly AutomationProperty NativeWindowHandleProperty = AutomationElementIdentifiers.NativeWindowHandleProperty;
/// Property ID: AutomationId - An identifier for an element that is unique within its containing element.
public static readonly AutomationProperty AutomationIdProperty = AutomationElementIdentifiers.AutomationIdProperty;
/// Property ID: ItemType - An application-level property used to indicate what the items in a list represent.
public static readonly AutomationProperty ItemTypeProperty = AutomationElementIdentifiers.ItemTypeProperty;
/// Property ID: True if the control is a password protected field.
public static readonly AutomationProperty IsPasswordProperty = AutomationElementIdentifiers.IsPasswordProperty;
/// Property ID: Localized control type description (eg. "Button")
public static readonly AutomationProperty LocalizedControlTypeProperty = AutomationElementIdentifiers.LocalizedControlTypeProperty;
/// Property ID: name of this instance of control
public static readonly AutomationProperty NameProperty = AutomationElementIdentifiers.NameProperty;
/// Property ID: Hot-key equivalent for this command item. (eg. Ctrl-P for Print)
public static readonly AutomationProperty AcceleratorKeyProperty = AutomationElementIdentifiers.AcceleratorKeyProperty;
/// Property ID: Keys used to move focus to this control
public static readonly AutomationProperty AccessKeyProperty = AutomationElementIdentifiers.AccessKeyProperty;
/// Property ID: HasKeyboardFocus
public static readonly AutomationProperty HasKeyboardFocusProperty = AutomationElementIdentifiers.HasKeyboardFocusProperty;
/// Property ID: IsKeyboardFocusable
public static readonly AutomationProperty IsKeyboardFocusableProperty = AutomationElementIdentifiers.IsKeyboardFocusableProperty;
/// Property ID: Enabled
public static readonly AutomationProperty IsEnabledProperty = AutomationElementIdentifiers.IsEnabledProperty;
/// Property ID: BoundingRectangle - bounding rectangle
public static readonly AutomationProperty BoundingRectangleProperty = AutomationElementIdentifiers.BoundingRectangleProperty;
/// Property ID: id of process that this element lives in
public static readonly AutomationProperty ProcessIdProperty = AutomationElementIdentifiers.ProcessIdProperty;
/// Property ID: RuntimeId - runtime unique ID
public static readonly AutomationProperty RuntimeIdProperty = AutomationElementIdentifiers.RuntimeIdProperty;
/// Property ID: ClassName - name of underlying class - implementation dependant, but useful for test
public static readonly AutomationProperty ClassNameProperty = AutomationElementIdentifiers.ClassNameProperty;
/// Property ID: HelpText - brief description of what this control does
public static readonly AutomationProperty HelpTextProperty = AutomationElementIdentifiers.HelpTextProperty;
/// Property ID: ClickablePoint - Set by provider, used internally for GetClickablePoint
public static readonly AutomationProperty ClickablePointProperty = AutomationElementIdentifiers.ClickablePointProperty;
/// Property ID: Culture - Returns the culture that provides information about the control's content.
public static readonly AutomationProperty CultureProperty = AutomationElementIdentifiers.CultureProperty;
/// Property ID: Offscreen - Determined to be not-visible to the sighted user
public static readonly AutomationProperty IsOffscreenProperty = AutomationElementIdentifiers.IsOffscreenProperty;
/// Property ID: Orientation - Identifies whether a control is positioned in a specfic direction
public static readonly AutomationProperty OrientationProperty = AutomationElementIdentifiers.OrientationProperty;
/// Property ID: FrameworkId - Identifies the underlying UI framework's name for the element being accessed
public static readonly AutomationProperty FrameworkIdProperty = AutomationElementIdentifiers.FrameworkIdProperty;
/// Property ID: IsRequiredForForm - Identifies weather an edit field is required to be filled out on a form
public static readonly AutomationProperty IsRequiredForFormProperty = AutomationElementIdentifiers.IsRequiredForFormProperty;
/// Property ID: ItemStatus - Identifies the status of the visual representation of a complex item
public static readonly AutomationProperty ItemStatusProperty = AutomationElementIdentifiers.ItemStatusProperty;
#region IsNnnnPatternAvailable properties
/// Property that indicates whether the DockPattern is available for this AutomationElement
public static readonly AutomationProperty IsDockPatternAvailableProperty = AutomationElementIdentifiers.IsDockPatternAvailableProperty;
/// Property that indicates whether the ExpandCollapsePattern is available for this AutomationElement
public static readonly AutomationProperty IsExpandCollapsePatternAvailableProperty = AutomationElementIdentifiers.IsExpandCollapsePatternAvailableProperty;
/// Property that indicates whether the GridItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsGridItemPatternAvailableProperty = AutomationElementIdentifiers.IsGridItemPatternAvailableProperty;
/// Property that indicates whether the GridPattern is available for this AutomationElement
public static readonly AutomationProperty IsGridPatternAvailableProperty = AutomationElementIdentifiers.IsGridPatternAvailableProperty;
/// Property that indicates whether the InvokePattern is available for this AutomationElement
public static readonly AutomationProperty IsInvokePatternAvailableProperty = AutomationElementIdentifiers.IsInvokePatternAvailableProperty;
/// Property that indicates whether the MultipleViewPattern is available for this AutomationElement
public static readonly AutomationProperty IsMultipleViewPatternAvailableProperty = AutomationElementIdentifiers.IsMultipleViewPatternAvailableProperty;
/// Property that indicates whether the RangeValuePattern is available for this AutomationElement
public static readonly AutomationProperty IsRangeValuePatternAvailableProperty = AutomationElementIdentifiers.IsRangeValuePatternAvailableProperty;
/// Property that indicates whether the SelectionItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsSelectionItemPatternAvailableProperty = AutomationElementIdentifiers.IsSelectionItemPatternAvailableProperty;
/// Property that indicates whether the SelectionPattern is available for this AutomationElement
public static readonly AutomationProperty IsSelectionPatternAvailableProperty = AutomationElementIdentifiers.IsSelectionPatternAvailableProperty;
/// Property that indicates whether the ScrollPattern is available for this AutomationElement
public static readonly AutomationProperty IsScrollPatternAvailableProperty = AutomationElementIdentifiers.IsScrollPatternAvailableProperty;
/// Property that indicates whether the ScrollItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsScrollItemPatternAvailableProperty = AutomationElementIdentifiers.IsScrollItemPatternAvailableProperty;
/// Property that indicates whether the TablePattern is available for this AutomationElement
public static readonly AutomationProperty IsTablePatternAvailableProperty = AutomationElementIdentifiers.IsTablePatternAvailableProperty;
/// Property that indicates whether the TableItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsTableItemPatternAvailableProperty = AutomationElementIdentifiers.IsTableItemPatternAvailableProperty;
/// Property that indicates whether the TextPattern is available for this AutomationElement
public static readonly AutomationProperty IsTextPatternAvailableProperty = AutomationElementIdentifiers.IsTextPatternAvailableProperty;
/// Property that indicates whether the TogglePattern is available for this AutomationElement
public static readonly AutomationProperty IsTogglePatternAvailableProperty = AutomationElementIdentifiers.IsTogglePatternAvailableProperty;
/// Property that indicates whether the TransformPattern is available for this AutomationElement
public static readonly AutomationProperty IsTransformPatternAvailableProperty = AutomationElementIdentifiers.IsTransformPatternAvailableProperty;
/// Property that indicates whether the ValuePattern is available for this AutomationElement
public static readonly AutomationProperty IsValuePatternAvailableProperty = AutomationElementIdentifiers.IsValuePatternAvailableProperty;
/// Property that indicates whether the WindowPattern is available for this AutomationElement
public static readonly AutomationProperty IsWindowPatternAvailableProperty = AutomationElementIdentifiers.IsWindowPatternAvailableProperty;
#endregion IsNnnnPatternAvailable properties
#region Events
/// Event ID: ToolTipOpenedEvent - indicates a tooltip has appeared
public static readonly AutomationEvent ToolTipOpenedEvent = AutomationElementIdentifiers.ToolTipOpenedEvent;
/// Event ID: ToolTipClosedEvent - indicates a tooltip has closed.
public static readonly AutomationEvent ToolTipClosedEvent = AutomationElementIdentifiers.ToolTipClosedEvent;
/// Event ID: StructureChangedEvent - used mainly by servers to notify of structure changed events. Clients use AddStructureChangedHandler.
public static readonly AutomationEvent StructureChangedEvent = AutomationElementIdentifiers.StructureChangedEvent;
/// Event ID: MenuOpened - Indicates an a menu has opened.
public static readonly AutomationEvent MenuOpenedEvent = AutomationElementIdentifiers.MenuOpenedEvent;
/// Event ID: AutomationPropertyChangedEvent - used mainly by servers to notify of property changes. Clients use AddPropertyChangedListener.
public static readonly AutomationEvent AutomationPropertyChangedEvent = AutomationElementIdentifiers.AutomationPropertyChangedEvent;
/// Event ID: AutomationFocusChangedEvent - used mainly by servers to notify of focus changed events. Clients use AddAutomationFocusChangedListener.
public static readonly AutomationEvent AutomationFocusChangedEvent = AutomationElementIdentifiers.AutomationFocusChangedEvent;
/// Event ID: AsyncContentLoadedEvent - indicates an async content loaded event.
public static readonly AutomationEvent AsyncContentLoadedEvent = AutomationElementIdentifiers.AsyncContentLoadedEvent;
/// Event ID: MenuClosed - Indicates an a menu has closed.
public static readonly AutomationEvent MenuClosedEvent = AutomationElementIdentifiers.MenuClosedEvent;
/// Event ID: LayoutInvalidated - Indicates that many element locations/extents/offscreenedness have changed.
public static readonly AutomationEvent LayoutInvalidatedEvent = AutomationElementIdentifiers.LayoutInvalidatedEvent;
#endregion Events
#endregion Public Constants and Readonly Fields
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
#region Equality
///
/// Overrides Object.Equals
///
/// The Object to compare with the current object
/// true if the AutomationElements refer to the same UI; otherwise, false
/// Note that two AutomationElements that compare as equal may contain
/// different cached information from different points in time; the equality check only
/// tests that the AutomationElements refer to the same underlying UI.
///
public override bool Equals(object obj)
{
AutomationElement el = obj as AutomationElement;
if (obj == null || el == null)
return false;
return Misc.Compare(this, el);
}
///
/// Overrides Object.GetHashCode
///
/// An integer that represents the hashcode for this AutomationElement
public override int GetHashCode()
{
int[] id = GetRuntimeId();
int hash = 0;
if (id == null)
{
// Hash codes need to be unique if the runtime ids are null we will end up
// handing out duplicates so throw an exception.
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
for (int i = 0; i < id.Length; i++)
{
hash = (hash * 2) ^ id[i];
}
return hash;
}
///
/// Tests whether two AutomationElement objects are equivalent
///
/// The AutomationElement that is to the left of the equality operator
/// The AutomationElement that is to the right of the equality operator
/// This operator returns true if two AutomationElements refer to the same UI; otherwise false
/// Note that two AutomationElements that compare as equal may contain
/// different cached information from different points in time; the equality check only
/// tests that the AutomationElements refer to the same underlying UI.
///
public static bool operator ==(AutomationElement left, AutomationElement right)
{
if ((object)left == null)
return (object)right == null;
if ((object)right == null)
return (object)left == null;
return left.Equals(right);
}
///
/// Tests whether two AutomationElement objects are not equivalent
///
/// The AutomationElement that is to the left of the inequality operator
/// The AutomationElement that is to the right of the inequality operator
/// This operator returns true if two AutomationElements refer to different UI; otherwise false
public static bool operator !=(AutomationElement left, AutomationElement right)
{
return !(left == right);
}
#endregion Equality
///
/// Returns an array of ints that uniquely identifies the UI element that this object represents.
/// Caller should treat the array as an opaque value; do not attempt to analyze it or pick it apart,
/// the format may change in future.
///
/// These identifies are only guaranteed to be unique on a given desktop.
/// Identifiers may be recycled over time.
///
///
///
/// This API does not work inside the secure execution environment.
///
public int[] GetRuntimeId()
{
if (_runtimeId != null)
return _runtimeId;
//Not true - some AE's from properties and event args (eg. SelectionItem.SelectionContainer,
//and FocuEventArgs's previousFocus) don't currently come through CacheReqest
//Debug.Assert(false, "Should always have runtimeID from cache at ctor.");
// false -> return null (instead of throwing) if not available; true->wrap
int [] val = LookupCachedValue(AutomationElement.RuntimeIdProperty, false, true) as int[];
if (val != null)
{
_runtimeId = val;
return _runtimeId;
}
// Possible that we got this element from a path that doesn't have prefetch
// enabled - fall back to getting RuntimeId the slow cross-proc way for now
// Also possible that this was called on an empty element - eg. where someone
// use TreeScope.Children to get just the children, but not any info for this
// element. CheckElement() will throw an exception in that case...
CheckElement();
_runtimeId = UiaCoreApi.UiaGetRuntimeId(_hnode);
return _runtimeId;
}
///
/// Get element at specified point on current desktop
///
/// point in screen coordinates
/// element at specified point
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FromPoint(Point pt)
{
return DrillForPointOrFocus(true, pt, CacheRequest.CurrentUiaCacheRequest);
}
///
/// Get element from specified HWND
///
/// Handle of window to get element for
/// element representing root node of specified window
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FromHandle(IntPtr hwnd)
{
Misc.ValidateArgument(hwnd != IntPtr.Zero, SRID.HwndMustBeNonNULL);
SafeNodeHandle hnode = UiaCoreApi.UiaNodeFromHandle(hwnd);
if (hnode.IsInvalid)
{
return null;
}
UiaCoreApi.UiaCacheRequest cacheRequest = CacheRequest.CurrentUiaCacheRequest;
// Don't do any normalization when getting updated cache...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
//
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
///
/// Converts a local IRawElementProvider implementation to an AutomationElement.
///
/// Local object implementing IRawElementProvider
/// A corresponding AutomationElement for the impl parameter
/// This would be used by a client helper library that wanted
/// to allow its callers to access its own native element type via PAW.
/// For example, the Windows Client Platform uses its own Element type, but
/// uses this iternally so that it can had back an AutomationElement to clients
/// that want to get an AutomationElement directly from an Element.
///
public static AutomationElement FromLocalProvider(IRawElementProviderSimple localImpl)
{
Misc.ValidateArgumentNonNull(localImpl, "localImpl");
return AutomationElement.Wrap(UiaCoreApi.UiaNodeFromProvider(localImpl));
}
///
/// Get current value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Returns value of specified property
///
/// If the specified property is not explicitly supported by the target UI,
/// a default value will be returned. For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCurrentPropertyValue
/// for that property will return an empty string.
///
/// This API gets the current value of the property at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access values in this AutomationElement's
/// cache, use GetCachedPropertyValue instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPropertyValue(AutomationProperty property)
{
return GetCurrentPropertyValue(property, false);
}
///
/// Get the current value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Specifies whether a default value should be
/// ignored if the specified property is supported by the target UI
/// Returns value of specified property, or AutomationElement.NotSupported
///
/// This API gets the current value of the property at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access values in this AutomationElement's
/// cache, use GetCachedPropertyValue instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPropertyValue(AutomationProperty property, bool ignoreDefaultValue)
{
Misc.ValidateArgumentNonNull(property, "property");
CheckElement();
AutomationPropertyInfo pi;
if (!Schema.GetPropertyInfo(property, out pi))
{
return new ArgumentException(SR.Get(SRID.UnsupportedProperty));
}
object value;
// PRESHARP will flag this as warning 56506/6506:Parameter 'property' to this public method must be validated: A null-dereference can occur here.
// False positive, property is checked, see above
#pragma warning suppress 6506
UiaCoreApi.UiaGetPropertyValue(_hnode, property.Id, out value);
if (value != AutomationElement.NotSupported)
{
//
if (value != null && pi.ObjectConverter != null)
{
value = pi.ObjectConverter(value);
}
}
else
{
if (ignoreDefaultValue)
{
value = AutomationElement.NotSupported;
}
else
{
value = Schema.GetDefaultValue(property);
}
}
return value;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Returns the pattern as an object, if currently supported
///
/// Throws InvalidOperationException if the pattern is not supported.
///
/// This API gets the pattern based on availability at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access patterns in this AutomationElement's
/// cache, use GetCachedPattern instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPattern(AutomationPattern pattern)
{
object retObject;
if (!TryGetCurrentPattern(pattern, out retObject))
{
throw new InvalidOperationException(SR.Get(SRID.UnsupportedPattern));
}
return retObject;
}
///
/// Get a pattern class from this object
///
/// an object repressenting the AutomationPattern indicating
/// the pattern to return
/// the returned pattern object will be an object
/// implementing the control pattern interface if the pattern is supported else
/// the object will be null.
/// Returns true, if currently supported
///
/// This API gets the pattern based on availability at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access patterns in this AutomationElement's
/// cache, use GetCachedPattern instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetCurrentPattern(AutomationPattern pattern, out object patternObject)
{
patternObject = null;
Misc.ValidateArgumentNonNull(pattern, "pattern");
CheckElement();
// Need to catch non-critical exceptions. The WinFormsSpinner will raise an
// InvalidOperationException if it is a domain spinner and the SelectionPattern is asked for.
SafePatternHandle hpatternobj = null;
try
{
hpatternobj = UiaCoreApi.UiaGetPatternProvider(_hnode, pattern.Id);
}
catch (Exception e)
{
if (Misc.IsCriticalException(e))
{
throw e;
}
return false;
}
if (hpatternobj.IsInvalid)
{
return false;
}
patternObject = Misc.WrapInterfaceOnClientSide(this, hpatternobj, pattern);
return patternObject != null;
}
///
/// Get cached value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Returns value of specified property
///
/// Throws InvalidOperationException if the requested property was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// If the specified property is not explicitly supported by the target UI,
/// a default value will be returned. For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCachedPropertyValue
/// for that property will return an empty string.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPropertyValue(AutomationProperty property)
{
return GetCachedPropertyValue(property, false);
}
///
/// Get the cached value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Specifies whether a default value should be
/// ignored if the specified property is not supported by the target UI
/// Returns value of specified property, or AutomationElement.NotSupported
///
/// Throws InvalidOperationException if the requested property was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// If ignoreDefaultValue is true, then when the specified property is not
/// explicitly supported by the target UI, a default value will not be returned.
/// For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCachedPropertyValue
/// for that property will return an empty string.
/// When ignoreDefaultValue is true, the value AutomationElement.NotSupported will
/// be returned instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPropertyValue(AutomationProperty property, bool ignoreDefaultValue)
{
Misc.ValidateArgumentNonNull(property, "property");
// true -> throw if not available, true -> wrap
object val = LookupCachedValue(property, true, true);
UiaCoreApi.IsErrorMarker(val, true/*throwException*/);
if (val == AutomationElement.NotSupported && !ignoreDefaultValue)
{
val = Schema.GetDefaultValue(property);
}
return val;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Returns the pattern as an object, if currently supported; otherwise returns null/
///
/// Throws InvalidOperationException if the requested pattern was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// This API gets the pattern from the cache.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPattern(AutomationPattern pattern)
{
object patternObject;
if (!TryGetCachedPattern(pattern, out patternObject))
{
throw new InvalidOperationException(SR.Get(SRID.UnsupportedPattern));
}
return patternObject;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Is the pattern as an object, if currently in the cache; otherwise is null
/// Returns true, if currently in the cache; otherwise returns false
///
/// This API gets the pattern from the cache.
///
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetCachedPattern(AutomationPattern pattern, out object patternObject)
{
patternObject = null;
// Lookup a cached remote reference - but even if we get
// back null, still go ahead an create a pattern wrapper
// to provide access to cached properties
Misc.ValidateArgumentNonNull(pattern, "pattern");
// false -> don't throw, false -> don't wrap
object obj = LookupCachedValue(pattern, false, false);
if (obj == null)
{
return false;
}
SafePatternHandle hPattern = (SafePatternHandle)obj;
AutomationPatternInfo pi;
if (!Schema.GetPatternInfo(pattern, out pi))
{
throw new ArgumentException(SR.Get(SRID.UnsupportedPattern));
}
patternObject = pi.ClientSideWrapper(this, hPattern, true);
return patternObject != null;
}
///
/// Get an AutomationElement with updated cached values
///
/// CacheRequest object describing the properties and other information to fetch
/// Returns a new AutomationElement, which refers to the same UI as this element, but which is
/// populated with properties specified in the CacheRequest.
///
/// Unlike other methods, such as FromHandle, FromPoint, this method takes
/// an explicit CacheRequest as a parameter, and ignores the currently
/// active CacheRequest.
///
public AutomationElement GetUpdatedCache(CacheRequest request)
{
Misc.ValidateArgumentNonNull(request, "request");
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest = request.GetUiaCacheRequest();
// Don't normalize when getting updated cache...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(_hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
///
/// Find first child or descendant element that matches specified condition
///
/// Indicates whether to include this element, children
/// or descendants in the search
/// Condition to search for
/// Returns first element that satisfies condition,
/// or null if no match is found.
public AutomationElement FindFirst(TreeScope scope, Condition condition)
{
Misc.ValidateArgumentNonNull(condition, "condition");
UiaCoreApi.UiaCacheResponse[] responses = Find(scope, condition, CacheRequest.CurrentUiaCacheRequest, true, null);
if (responses.Length < 1)
{
return null;
}
Debug.Assert(responses.Length == 1);
return CacheHelper.BuildAutomationElementsFromResponse(CacheRequest.CurrentUiaCacheRequest, responses[0]);
}
///
/// Find all child or descendant elements that match specified condition
///
/// Indicates whether to include this element, children
/// or descendants in the search
/// Condition to search for
/// Returns collection of all AutomationElements that
/// match specified condition. Collection will be empty if
/// no matches found.
public AutomationElementCollection FindAll(TreeScope scope, Condition condition)
{
Misc.ValidateArgumentNonNull(condition, "condition");
UiaCoreApi.UiaCacheRequest request = CacheRequest.CurrentUiaCacheRequest;
UiaCoreApi.UiaCacheResponse[] responses = Find(scope, condition, request, false, null);
AutomationElement[] els = new AutomationElement[responses.Length];
for( int i = 0 ; i < responses.Length ; i ++ )
{
els[i] = CacheHelper.BuildAutomationElementsFromResponse(request, responses[i]);
}
return new AutomationElementCollection( els );
}
///
/// Get array of supported property identifiers
///
///
/// The returned array contains at least all the properties supported by this element;
/// however it may also contain duplicate entries or properties that the element does not
/// currently support or which have null or empty values. Use GetPropertyValue to determine
/// whether a property is currently supported and to determine what its current value is.
///
///
///
/// This API does not work inside the secure execution environment.
///
public AutomationProperty [ ] GetSupportedProperties()
{
CheckElement();
ArrayList propArrays = new ArrayList(4);
propArrays.Add(Schema.GetBasicProperties());
AutomationPattern[] patterns = GetSupportedPatterns();
if (patterns != null && patterns.Length > 0)
{
foreach (AutomationPattern pattern in patterns)
{
AutomationPatternInfo pi;
if (Schema.GetPatternInfo(pattern, out pi))
{
if (pi.Properties != null)
{
propArrays.Add(pi.Properties);
}
}
}
}
return (AutomationProperty[])Misc.RemoveDuplicates(Misc.CombineArrays(propArrays, typeof(AutomationProperty)), typeof(AutomationProperty));
}
///
/// Get the interfaces that this object supports
///
/// An array of AutomationPatterns that represent the supported interfaces
///
///
/// This API does not work inside the secure execution environment.
///
public AutomationPattern [ ] GetSupportedPatterns()
{
CheckElement();
ArrayList interfaces = new ArrayList(4);
object patternObject;
foreach (AutomationPatternInfo pi in Schema.GetPatternInfoTable())
{
if (TryGetCurrentPattern(pi.ID, out patternObject))
{
interfaces.Add(pi.ID);
}
}
return (AutomationPattern[])interfaces.ToArray(typeof(AutomationPattern));
}
///
/// Request to set focus to this element
///
///
///
/// This API does not work inside the secure execution environment.
///
public void SetFocus()
{
CheckElement();
object canReceiveFocus = GetCurrentPropertyValue(AutomationElement.IsKeyboardFocusableProperty);
if (canReceiveFocus is bool && (bool)canReceiveFocus)
{
UiaCoreApi.UiaSetFocus(_hnode);
}
else
{
throw new InvalidOperationException(SR.Get(SRID.SetFocusFailed));
}
}
///
/// Get a point that can be clicked on. If there is no ClickablePoint return false
///
/// A point that can be used ba a client to click on this LogicalElement
/// true if there is point that is clickable
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetClickablePoint( out Point pt )
{
// initialize point here so if we return false its initialized
pt = new Point (0, 0);
// Request the provider for a clickable point.
object ptClickable = GetCurrentPropertyValue(AutomationElement.ClickablePointProperty);
if (ptClickable == NotSupported)
{
return false;
}
// if got one
if (ptClickable is Point)
{
//If the ClickablePointProperty from the provider is NaN that means no point.
if (double.IsNaN (((Point) ptClickable).X) || double.IsNaN (((Point) ptClickable).Y))
{
return false;
}
// Allow the object if it is the element or a descentant...
AutomationElement scan = AutomationElement.FromPoint((Point)ptClickable);
while (scan != null)
{
if (scan == this)
{
pt = (Point)ptClickable;
return true;
}
scan = TreeWalker.RawViewWalker.GetParent(scan, CacheRequest.DefaultCacheRequest);
}
}
// the providers point is either no good or they did not have one so poke around
// trying to find one.
if (ClickablePoint.HitTestForClickablePoint( (AutomationElement)this, out pt) )
return true;
return false;
}
///
/// Get a point that can be clicked on. This throws the NoClickablePointException if there is no clickable point
///
/// A point that can be used by a client to click on this LogicalElement
/// If there is not clickable point for this element
///
///
/// This API does not work inside the secure execution environment.
///
public Point GetClickablePoint()
{
Point pt;
if ( !TryGetClickablePoint( out pt ) )
throw new NoClickablePointException(SR.Get(SRID.LogicalElementNoClickablePoint));
return pt;
}
#endregion Public Methods
//-----------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
///
/// Get root element for current desktop
///
/// root element for current desktop
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement RootElement
{
get
{
SafeNodeHandle hnode = UiaCoreApi.UiaGetRootNode();
UiaCoreApi.UiaCacheRequest cacheRequest = CacheRequest.CurrentUiaCacheRequest;
// Don't normalize...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
//
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
}
///
/// Return the currently focused element
///
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FocusedElement
{
get
{
//CASRemoval:AutomationPermission.Demand(AutomationPermissionFlag.Read);
return DrillForPointOrFocus(false, new Point(0, 0), CacheRequest.CurrentUiaCacheRequest);
}
}
///
/// This member allows access to previously requested
/// cached properties for this element. The returned object
/// has accessors for AutomationElement properties.
///
///
/// Cached property values must have been previously requested
/// using a CacheRequest. If you try to access a cached
/// property that was not previously requested, an InvalidOperation
/// Exception will be thrown.
///
/// To get the value of a property at the current point in time,
/// access the property via the Current accessor instead of
/// Cached.
///
public AutomationElementInformation Cached
{
get
{
return new AutomationElementInformation(this, true);
}
}
///
/// This member allows access to current property values
/// for this element. The returned object has accessors for
/// AutomationElement properties.
///
///
/// This AutomationElement must have a
/// Full reference in order to get current values. If the
/// AutomationElement was obtained using AutomationElementMode.None,
/// then it contains only cached data, and attempting to get
/// the current value of any property will throw an InvalidOperationException.
///
/// To get the cached value of a property that was previously
/// specified using a CacheRequest, access the property via the
/// Cached accessor instead of Current.
///
public AutomationElementInformation Current
{
get
{
return new AutomationElementInformation(this, false);
}
}
///
/// Returns the cached parent of this AutomationElement
///
///
/// Returns the parent of this element, with respect to the TreeFilter
/// condition of the CacheRequest that was active when this AutomationElement
/// was obtained.
///
/// Throws InvalidOperationException if the parent was not previously requested
/// in a CacheRequest.
///
/// Can return null if the specified element has no parent - eg. is the root node.
///
public AutomationElement CachedParent
{
get
{
// this is used as a marker to indicate 'not requested'
// - used since null is a valid value for parent, but this can never be.
// Use (object) case to ensure we just do a ref check here, not call .Equals
if ((object)_cachedParent == (object)this)
{
// PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions
// We've spec'd as throwing an Exception, and that's what we do PreSharp shouldn't complain
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
return _cachedParent;
}
}
///
/// Returns the cached children of this AutomationElement
///
///
/// Returns a collection of children of this element, with respect to the TreeFilter
/// condition of the CacheRequest that was active when this AutomationElement
/// was obtained.
///
/// Throws InvalidOperationException if children or descendants were not previously requested
/// in a CacheRequest.
///
/// Can return an empty collection if this AutomationElement has no children.
///
public AutomationElementCollection CachedChildren
{
get
{
// this is used as a marker to indicate 'not requested'
// - used since null is a valid value for parent, but this can never be.
// Use (object) case to ensure we just do a ref check here, not call .Equals
if ((object)_cachedFirstChild == (object)this)
{
// PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions
// We've spec'd as throwing an Exception, and that's what we do PreSharp shouldn't complain
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
// Build up an array to return - first count the children,
// then build an array and populate it...
int childCount = 0;
AutomationElement scan = _cachedFirstChild;
for (; scan != null; scan = scan._cachedNextSibling)
{
childCount++;
}
AutomationElement[] children = new AutomationElement[childCount];
scan = _cachedFirstChild;
for (int i = 0; i < childCount; i++)
{
children[i] = scan;
scan = scan._cachedNextSibling;
}
return new AutomationElementCollection(children);
}
}
#endregion Public Properties
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal void CheckElement()
{
if (_hnode == null || _hnode.IsInvalid)
{
throw new InvalidOperationException(SR.Get(SRID.CacheRequestNeedElementReference));
}
}
// Called by the treewalker classes to navigate - we call through to the
// provider wrapper, which gets the navigator code to do its stuff
internal AutomationElement Navigate(NavigateDirection direction, Condition condition, CacheRequest request)
{
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest;
if (request == null)
cacheRequest = CacheRequest.DefaultUiaCacheRequest;
else
cacheRequest = request.GetUiaCacheRequest();
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaNavigate(_hnode, direction, condition, cacheRequest);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
internal AutomationElement Normalize(Condition condition, CacheRequest request )
{
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest;
if (request == null)
cacheRequest = CacheRequest.DefaultUiaCacheRequest;
else
cacheRequest = request.GetUiaCacheRequest();
// Normalize against the treeview condition, not the one in the cache request...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(_hnode, cacheRequest, UiaCoreApi.NormalizeState.Custom, condition);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
// Used by the pattern wrappers to get property values
internal object GetPatternPropertyValue(AutomationProperty property, bool useCache)
{
if (useCache)
return GetCachedPropertyValue(property);
else
return GetCurrentPropertyValue(property);
}
// The following are used by CacheUtil when building up a cached AutomationElemen tree
internal void SetCachedParent(AutomationElement cachedParent)
{
_cachedParent = cachedParent;
// If we're setting the parent, it means this is one of potentially
// many siblings - so set _cachedNextSibling to null, instead of
// the 'not requested' marker value 'this'
_cachedNextSibling = null;
}
internal void SetCachedFirstChild(AutomationElement cachedFirstChild)
{
_cachedFirstChild = cachedFirstChild;
}
internal void SetCachedNextSibling(AutomationElement cachedNextSibling)
{
_cachedNextSibling = cachedNextSibling;
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal SafeNodeHandle RawNode
{
get
{
return _hnode;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Lookup a cached AutomationPattern or AutomationProperty
object LookupCachedValue(AutomationIdentifier id, bool throwIfNotRequested, bool wrap)
{
if (_cachedValues == null)
{
if (throwIfNotRequested)
{
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
else
{
return null;
}
}
AutomationProperty automationProperty = id as AutomationProperty;
bool isProperty = automationProperty != null;
AutomationIdentifier[] refTable = isProperty ? (AutomationIdentifier[])_request.Properties
: (AutomationIdentifier[])_request.Patterns;
bool found = false;
object val = null;
int dataOffset = isProperty ? 1 : 1 + _request.Properties.Length;
for (int i = 0; i < refTable.Length; i++)
{
if (refTable[i] == id)
{
found = true;
val = _cachedValues[_cachedValuesIndex, i + dataOffset];
break;
}
}
if (!found)
{
if (throwIfNotRequested)
{
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
else
{
return null;
}
}
// Bail now if no wrapping required; also, even with wrapping, null remains null
// for both properties and patterns..
if (!wrap || val == null)
{
return val;
}
AutomationPattern automationPattern = id as AutomationPattern;
// Cached values are internally stored as unwrapped, direct-from-provider values, so
// need to be wrapped as appropriate before handing back to client...
if (automationPattern != null)
{
SafePatternHandle hpatternobj = (SafePatternHandle)val;
val = Misc.WrapInterfaceOnClientSide(this, hpatternobj, automationPattern);
}
// No wrapping necessary here for properties - the objects in the array are fully wrapped/converted as soon as they are
// received from the unmanaged API, so they're ready-to-use without any further processing.
return val;
}
// drill for either focused raw element, or element at specified point
private static AutomationElement DrillForPointOrFocus(bool atPoint, Point pt, UiaCoreApi.UiaCacheRequest cacheRequest)
{
UiaCoreApi.UiaCacheResponse response;
if (atPoint)
response = UiaCoreApi.UiaNodeFromPoint(pt.X, pt.Y, cacheRequest);
else
response = UiaCoreApi.UiaNodeFromFocus(cacheRequest);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
// called by FindFirst and FindAll
private UiaCoreApi.UiaCacheResponse[] Find(TreeScope scope, Condition condition, UiaCoreApi.UiaCacheRequest request, bool findFirst, BackgroundWorker worker)
{
Misc.ValidateArgumentNonNull(condition, "condition");
if (scope == 0)
{
throw new ArgumentException(SR.Get(SRID.TreeScopeNeedAtLeastOne));
}
if ((scope & ~(TreeScope.Element | TreeScope.Children | TreeScope.Descendants)) != 0)
{
throw new ArgumentException(SR.Get(SRID.TreeScopeElementChildrenDescendantsOnly));
}
// Set up a find struct...
UiaCoreApi.UiaFindParams findParams = new UiaCoreApi.UiaFindParams();
findParams.FindFirst = findFirst;
if ((scope & TreeScope.Descendants) != 0)
findParams.MaxDepth = -1;
else if ((scope & TreeScope.Children) != 0)
findParams.MaxDepth = 1;
else
findParams.MaxDepth = 0;
if ((scope & TreeScope.Element) != 0)
findParams.ExcludeRoot = false;
else
findParams.ExcludeRoot = true;
UiaCoreApi.UiaCacheResponse[] retVal = UiaCoreApi.UiaFind(_hnode, findParams, condition, request);
return retVal;
}
#endregion Private Methods
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
private SafeNodeHandle _hnode;
private int[] _runtimeId;
// Cached object values - use in conjunction with the Properties/Pattern arrays in
// _request to figure out which properties/patterns they are.
// Note that these use NotSupported, so need to substitute default values
// when returning to user.
private object[,] _cachedValues;
private int _cachedValuesIndex; // index of row in cachedValues that corresponds to this element
// Reference to the cache request information that was active when this
// element was created
private UiaCoreApi.UiaCacheRequest _request;
// Cached structure links - these set to 'this' to indicate that they
// were not requested - since null is a valid value.
private AutomationElement _cachedParent;
private AutomationElement _cachedFirstChild;
private AutomationElement _cachedNextSibling;
#endregion Private Fields
//------------------------------------------------------
//
// Nested Classes
//
//-----------------------------------------------------
#region Nested Classes
///
/// This class provides access to either Cached or Current
/// properties on an AutomationElement via the .Cached or
/// .Current accessors.
///
public struct AutomationElementInformation
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
internal AutomationElementInformation(AutomationElement el, bool useCache)
{
_el = el;
_useCache = useCache;
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
/// The ControlType of this Element
public ControlType ControlType { get { return (ControlType) _el.GetPatternPropertyValue(ControlTypeProperty, _useCache); } }
/// Localized control type description (eg. "Button")
public string LocalizedControlType { get { return (string) _el.GetPatternPropertyValue(LocalizedControlTypeProperty, _useCache); } }
/// Name of this instance of control
public string Name { get { return (string) _el.GetPatternPropertyValue(NameProperty, _useCache); } }
/// Hot-key equivalent for this command item. (eg. Ctrl-P for Print)
public string AcceleratorKey { get { return (string) _el.GetPatternPropertyValue(AcceleratorKeyProperty, _useCache); } }
/// Keys used to move focus to this control
public string AccessKey { get { return (string) _el.GetPatternPropertyValue(AccessKeyProperty, _useCache); } }
/// Indicates whether this control has keyboard focus
public bool HasKeyboardFocus { get { return (bool) _el.GetPatternPropertyValue(HasKeyboardFocusProperty, _useCache); } }
/// True if this control can take keyboard focus
public bool IsKeyboardFocusable { get { return (bool) _el.GetPatternPropertyValue(IsKeyboardFocusableProperty, _useCache); } }
/// True if this control is enabled
public bool IsEnabled { get { return (bool) _el.GetPatternPropertyValue(IsEnabledProperty, _useCache); } }
/// Bounding rectangle, in screen coordinates
public Rect BoundingRectangle { get { return (Rect) _el.GetPatternPropertyValue(BoundingRectangleProperty, _useCache); } }
/// HelpText - brief description of what this control does
public string HelpText { get { return (string) _el.GetPatternPropertyValue(HelpTextProperty, _useCache); } }
/// Indicates that this element should be included in the Control view of the tree
public bool IsControlElement { get { return (bool) _el.GetPatternPropertyValue(IsControlElementProperty, _useCache); } }
/// Indicates that this element should be included in the Content view of the tree
public bool IsContentElement { get { return (bool) _el.GetPatternPropertyValue(IsContentElementProperty, _useCache); } }
/// The AutomationElement that labels this element
public AutomationElement LabeledBy { get { return (AutomationElement) _el.GetPatternPropertyValue(LabeledByProperty, _useCache); } }
/// The identifier for an element that is unique within its containing element
public string AutomationId { get { return (string) _el.GetPatternPropertyValue(AutomationIdProperty, _useCache); } }
/// Localized string that indicates what the items in a list represent
public string ItemType { get { return (string) _el.GetPatternPropertyValue(ItemTypeProperty, _useCache ); } }
/// True if the control is a password protected field.
public bool IsPassword { get { return (bool) _el.GetPatternPropertyValue(IsPasswordProperty, _useCache); } }
/// Name of underlying class - implementation dependant, but useful for test
public string ClassName { get { return (string) _el.GetPatternPropertyValue(ClassNameProperty, _useCache); } }
/// Window Handle, if the underlying control is a Window
public int NativeWindowHandle { get { return (int) _el.GetPatternPropertyValue(NativeWindowHandleProperty, _useCache); } }
/// Id of process that this element lives in
public int ProcessId { get { return (int) _el.GetPatternPropertyValue(ProcessIdProperty, _useCache); } }
/// True if this control is not visible to the sighted user
public bool IsOffscreen { get { return (bool) _el.GetPatternPropertyValue(IsOffscreenProperty, _useCache); } }
/// The controls specfied direction
public OrientationType Orientation { get { return (OrientationType) _el.GetPatternPropertyValue(OrientationProperty, _useCache); } }
/// The controls specfied direction
public string FrameworkId { get { return (string) _el.GetPatternPropertyValue(FrameworkIdProperty, _useCache); } }
/// True if this element is required to be filled out on a form
public bool IsRequiredForForm { get { return (bool) _el.GetPatternPropertyValue(IsRequiredForFormProperty, _useCache); } }
/// The visual status of a complex item as a string
public string ItemStatus { get { return (string) _el.GetPatternPropertyValue(ItemStatusProperty, _useCache); } }
#endregion Public Properties
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private AutomationElement _el; // AutomationElement that contains the cache or live reference
private bool _useCache; // true to use cache, false to use live reference to get current values
#endregion Private Fields
}
#endregion Nested Classes
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: Main class used by Automation clients, represents a UI element
//
// History:
// 02/06/2003 : BrendanM Created
//
//---------------------------------------------------------------------------
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System;
using System.Runtime.Serialization;
using System.Security.Permissions;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.ComponentModel;
using MS.Win32;
using MS.Internal.Automation;
using System.Runtime.InteropServices;
#if EVENT_TRACING_PROPERTY
using Microsoft.Win32.Diagnostics;
#endif
// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
namespace System.Windows.Automation
{
///
/// Represents an element in the UIAutomation tree.
///
#if (INTERNAL_COMPILE)
internal sealed class AutomationElement //: IDisposable
#else
public sealed class AutomationElement
#endif
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Private ctor, used mostly by CacheHelper when reconstructing AutomationElements from
// a CacheResponse.
internal AutomationElement(SafeNodeHandle hnode, object[,] cachedValues, int cachedValuesIndex, UiaCoreApi.UiaCacheRequest request)
{
_hnode = hnode; // Can be IntPtr.Zero for a lightweight object
_cachedValues = cachedValues; // Can be null if there are no cached properties for this node
_cachedValuesIndex = cachedValuesIndex;
_request = request;
// Set RuntimeId (if available; 'as int[]' filters out AutomationElement.NotAvailable)
_runtimeId = LookupCachedValue(AutomationElement.RuntimeIdProperty, false, true) as int[];
//
// One scenario that allows for null runtimeID - doing UpdatedCache() on a node and asking only
// for children - gives us back a placeholder node that only has valid .CachedChildren,
// the node itself doesn't have any cached properties or a node.
// Since null is a valid value for these, we need another value to
// indicate that they were not requested - it's a bit obscure, but
// 'this' works well here, since these can never have it as legal value.
_cachedParent = this;
_cachedFirstChild = this;
_cachedNextSibling = this;
}
///
/// Overrides Object.Finalize
///
~AutomationElement()
{
//
}
// Used by methods that return non-cached AutomationElements - examples currently include
// AutomationElements returned as properties (SelecitonContainer, RowHeaders).
internal static AutomationElement Wrap(SafeNodeHandle hnode)
{
if (hnode == null || hnode.IsInvalid)
{
return null;
}
return new AutomationElement(hnode, null, 0, null);
}
#endregion Constructors
//------------------------------------------------------
//
// Public Constants / Readonly Fields
//
//-----------------------------------------------------
#region Public Constants and Readonly Fields
///
/// Indicates that a element does not support the requested value
///
public static readonly object NotSupported = AutomationElementIdentifiers.NotSupported;
/// Property ID: Indicates that this element should be included in the Control view of the tree
public static readonly AutomationProperty IsControlElementProperty = AutomationElementIdentifiers.IsControlElementProperty;
/// Property ID: The ControlType of this Element
public static readonly AutomationProperty ControlTypeProperty = AutomationElementIdentifiers.ControlTypeProperty;
/// Property ID: NativeWindowHandle - Window Handle, if the underlying control is a Window
public static readonly AutomationProperty IsContentElementProperty = AutomationElementIdentifiers.IsContentElementProperty;
/// Property ID: The AutomationElement that labels this element
public static readonly AutomationProperty LabeledByProperty = AutomationElementIdentifiers.LabeledByProperty;
/// Property ID: NativeWindowHandle - Window Handle, if the underlying control is a Window
public static readonly AutomationProperty NativeWindowHandleProperty = AutomationElementIdentifiers.NativeWindowHandleProperty;
/// Property ID: AutomationId - An identifier for an element that is unique within its containing element.
public static readonly AutomationProperty AutomationIdProperty = AutomationElementIdentifiers.AutomationIdProperty;
/// Property ID: ItemType - An application-level property used to indicate what the items in a list represent.
public static readonly AutomationProperty ItemTypeProperty = AutomationElementIdentifiers.ItemTypeProperty;
/// Property ID: True if the control is a password protected field.
public static readonly AutomationProperty IsPasswordProperty = AutomationElementIdentifiers.IsPasswordProperty;
/// Property ID: Localized control type description (eg. "Button")
public static readonly AutomationProperty LocalizedControlTypeProperty = AutomationElementIdentifiers.LocalizedControlTypeProperty;
/// Property ID: name of this instance of control
public static readonly AutomationProperty NameProperty = AutomationElementIdentifiers.NameProperty;
/// Property ID: Hot-key equivalent for this command item. (eg. Ctrl-P for Print)
public static readonly AutomationProperty AcceleratorKeyProperty = AutomationElementIdentifiers.AcceleratorKeyProperty;
/// Property ID: Keys used to move focus to this control
public static readonly AutomationProperty AccessKeyProperty = AutomationElementIdentifiers.AccessKeyProperty;
/// Property ID: HasKeyboardFocus
public static readonly AutomationProperty HasKeyboardFocusProperty = AutomationElementIdentifiers.HasKeyboardFocusProperty;
/// Property ID: IsKeyboardFocusable
public static readonly AutomationProperty IsKeyboardFocusableProperty = AutomationElementIdentifiers.IsKeyboardFocusableProperty;
/// Property ID: Enabled
public static readonly AutomationProperty IsEnabledProperty = AutomationElementIdentifiers.IsEnabledProperty;
/// Property ID: BoundingRectangle - bounding rectangle
public static readonly AutomationProperty BoundingRectangleProperty = AutomationElementIdentifiers.BoundingRectangleProperty;
/// Property ID: id of process that this element lives in
public static readonly AutomationProperty ProcessIdProperty = AutomationElementIdentifiers.ProcessIdProperty;
/// Property ID: RuntimeId - runtime unique ID
public static readonly AutomationProperty RuntimeIdProperty = AutomationElementIdentifiers.RuntimeIdProperty;
/// Property ID: ClassName - name of underlying class - implementation dependant, but useful for test
public static readonly AutomationProperty ClassNameProperty = AutomationElementIdentifiers.ClassNameProperty;
/// Property ID: HelpText - brief description of what this control does
public static readonly AutomationProperty HelpTextProperty = AutomationElementIdentifiers.HelpTextProperty;
/// Property ID: ClickablePoint - Set by provider, used internally for GetClickablePoint
public static readonly AutomationProperty ClickablePointProperty = AutomationElementIdentifiers.ClickablePointProperty;
/// Property ID: Culture - Returns the culture that provides information about the control's content.
public static readonly AutomationProperty CultureProperty = AutomationElementIdentifiers.CultureProperty;
/// Property ID: Offscreen - Determined to be not-visible to the sighted user
public static readonly AutomationProperty IsOffscreenProperty = AutomationElementIdentifiers.IsOffscreenProperty;
/// Property ID: Orientation - Identifies whether a control is positioned in a specfic direction
public static readonly AutomationProperty OrientationProperty = AutomationElementIdentifiers.OrientationProperty;
/// Property ID: FrameworkId - Identifies the underlying UI framework's name for the element being accessed
public static readonly AutomationProperty FrameworkIdProperty = AutomationElementIdentifiers.FrameworkIdProperty;
/// Property ID: IsRequiredForForm - Identifies weather an edit field is required to be filled out on a form
public static readonly AutomationProperty IsRequiredForFormProperty = AutomationElementIdentifiers.IsRequiredForFormProperty;
/// Property ID: ItemStatus - Identifies the status of the visual representation of a complex item
public static readonly AutomationProperty ItemStatusProperty = AutomationElementIdentifiers.ItemStatusProperty;
#region IsNnnnPatternAvailable properties
/// Property that indicates whether the DockPattern is available for this AutomationElement
public static readonly AutomationProperty IsDockPatternAvailableProperty = AutomationElementIdentifiers.IsDockPatternAvailableProperty;
/// Property that indicates whether the ExpandCollapsePattern is available for this AutomationElement
public static readonly AutomationProperty IsExpandCollapsePatternAvailableProperty = AutomationElementIdentifiers.IsExpandCollapsePatternAvailableProperty;
/// Property that indicates whether the GridItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsGridItemPatternAvailableProperty = AutomationElementIdentifiers.IsGridItemPatternAvailableProperty;
/// Property that indicates whether the GridPattern is available for this AutomationElement
public static readonly AutomationProperty IsGridPatternAvailableProperty = AutomationElementIdentifiers.IsGridPatternAvailableProperty;
/// Property that indicates whether the InvokePattern is available for this AutomationElement
public static readonly AutomationProperty IsInvokePatternAvailableProperty = AutomationElementIdentifiers.IsInvokePatternAvailableProperty;
/// Property that indicates whether the MultipleViewPattern is available for this AutomationElement
public static readonly AutomationProperty IsMultipleViewPatternAvailableProperty = AutomationElementIdentifiers.IsMultipleViewPatternAvailableProperty;
/// Property that indicates whether the RangeValuePattern is available for this AutomationElement
public static readonly AutomationProperty IsRangeValuePatternAvailableProperty = AutomationElementIdentifiers.IsRangeValuePatternAvailableProperty;
/// Property that indicates whether the SelectionItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsSelectionItemPatternAvailableProperty = AutomationElementIdentifiers.IsSelectionItemPatternAvailableProperty;
/// Property that indicates whether the SelectionPattern is available for this AutomationElement
public static readonly AutomationProperty IsSelectionPatternAvailableProperty = AutomationElementIdentifiers.IsSelectionPatternAvailableProperty;
/// Property that indicates whether the ScrollPattern is available for this AutomationElement
public static readonly AutomationProperty IsScrollPatternAvailableProperty = AutomationElementIdentifiers.IsScrollPatternAvailableProperty;
/// Property that indicates whether the ScrollItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsScrollItemPatternAvailableProperty = AutomationElementIdentifiers.IsScrollItemPatternAvailableProperty;
/// Property that indicates whether the TablePattern is available for this AutomationElement
public static readonly AutomationProperty IsTablePatternAvailableProperty = AutomationElementIdentifiers.IsTablePatternAvailableProperty;
/// Property that indicates whether the TableItemPattern is available for this AutomationElement
public static readonly AutomationProperty IsTableItemPatternAvailableProperty = AutomationElementIdentifiers.IsTableItemPatternAvailableProperty;
/// Property that indicates whether the TextPattern is available for this AutomationElement
public static readonly AutomationProperty IsTextPatternAvailableProperty = AutomationElementIdentifiers.IsTextPatternAvailableProperty;
/// Property that indicates whether the TogglePattern is available for this AutomationElement
public static readonly AutomationProperty IsTogglePatternAvailableProperty = AutomationElementIdentifiers.IsTogglePatternAvailableProperty;
/// Property that indicates whether the TransformPattern is available for this AutomationElement
public static readonly AutomationProperty IsTransformPatternAvailableProperty = AutomationElementIdentifiers.IsTransformPatternAvailableProperty;
/// Property that indicates whether the ValuePattern is available for this AutomationElement
public static readonly AutomationProperty IsValuePatternAvailableProperty = AutomationElementIdentifiers.IsValuePatternAvailableProperty;
/// Property that indicates whether the WindowPattern is available for this AutomationElement
public static readonly AutomationProperty IsWindowPatternAvailableProperty = AutomationElementIdentifiers.IsWindowPatternAvailableProperty;
#endregion IsNnnnPatternAvailable properties
#region Events
/// Event ID: ToolTipOpenedEvent - indicates a tooltip has appeared
public static readonly AutomationEvent ToolTipOpenedEvent = AutomationElementIdentifiers.ToolTipOpenedEvent;
/// Event ID: ToolTipClosedEvent - indicates a tooltip has closed.
public static readonly AutomationEvent ToolTipClosedEvent = AutomationElementIdentifiers.ToolTipClosedEvent;
/// Event ID: StructureChangedEvent - used mainly by servers to notify of structure changed events. Clients use AddStructureChangedHandler.
public static readonly AutomationEvent StructureChangedEvent = AutomationElementIdentifiers.StructureChangedEvent;
/// Event ID: MenuOpened - Indicates an a menu has opened.
public static readonly AutomationEvent MenuOpenedEvent = AutomationElementIdentifiers.MenuOpenedEvent;
/// Event ID: AutomationPropertyChangedEvent - used mainly by servers to notify of property changes. Clients use AddPropertyChangedListener.
public static readonly AutomationEvent AutomationPropertyChangedEvent = AutomationElementIdentifiers.AutomationPropertyChangedEvent;
/// Event ID: AutomationFocusChangedEvent - used mainly by servers to notify of focus changed events. Clients use AddAutomationFocusChangedListener.
public static readonly AutomationEvent AutomationFocusChangedEvent = AutomationElementIdentifiers.AutomationFocusChangedEvent;
/// Event ID: AsyncContentLoadedEvent - indicates an async content loaded event.
public static readonly AutomationEvent AsyncContentLoadedEvent = AutomationElementIdentifiers.AsyncContentLoadedEvent;
/// Event ID: MenuClosed - Indicates an a menu has closed.
public static readonly AutomationEvent MenuClosedEvent = AutomationElementIdentifiers.MenuClosedEvent;
/// Event ID: LayoutInvalidated - Indicates that many element locations/extents/offscreenedness have changed.
public static readonly AutomationEvent LayoutInvalidatedEvent = AutomationElementIdentifiers.LayoutInvalidatedEvent;
#endregion Events
#endregion Public Constants and Readonly Fields
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
#region Equality
///
/// Overrides Object.Equals
///
/// The Object to compare with the current object
/// true if the AutomationElements refer to the same UI; otherwise, false
/// Note that two AutomationElements that compare as equal may contain
/// different cached information from different points in time; the equality check only
/// tests that the AutomationElements refer to the same underlying UI.
///
public override bool Equals(object obj)
{
AutomationElement el = obj as AutomationElement;
if (obj == null || el == null)
return false;
return Misc.Compare(this, el);
}
///
/// Overrides Object.GetHashCode
///
/// An integer that represents the hashcode for this AutomationElement
public override int GetHashCode()
{
int[] id = GetRuntimeId();
int hash = 0;
if (id == null)
{
// Hash codes need to be unique if the runtime ids are null we will end up
// handing out duplicates so throw an exception.
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
for (int i = 0; i < id.Length; i++)
{
hash = (hash * 2) ^ id[i];
}
return hash;
}
///
/// Tests whether two AutomationElement objects are equivalent
///
/// The AutomationElement that is to the left of the equality operator
/// The AutomationElement that is to the right of the equality operator
/// This operator returns true if two AutomationElements refer to the same UI; otherwise false
/// Note that two AutomationElements that compare as equal may contain
/// different cached information from different points in time; the equality check only
/// tests that the AutomationElements refer to the same underlying UI.
///
public static bool operator ==(AutomationElement left, AutomationElement right)
{
if ((object)left == null)
return (object)right == null;
if ((object)right == null)
return (object)left == null;
return left.Equals(right);
}
///
/// Tests whether two AutomationElement objects are not equivalent
///
/// The AutomationElement that is to the left of the inequality operator
/// The AutomationElement that is to the right of the inequality operator
/// This operator returns true if two AutomationElements refer to different UI; otherwise false
public static bool operator !=(AutomationElement left, AutomationElement right)
{
return !(left == right);
}
#endregion Equality
///
/// Returns an array of ints that uniquely identifies the UI element that this object represents.
/// Caller should treat the array as an opaque value; do not attempt to analyze it or pick it apart,
/// the format may change in future.
///
/// These identifies are only guaranteed to be unique on a given desktop.
/// Identifiers may be recycled over time.
///
///
///
/// This API does not work inside the secure execution environment.
///
public int[] GetRuntimeId()
{
if (_runtimeId != null)
return _runtimeId;
//Not true - some AE's from properties and event args (eg. SelectionItem.SelectionContainer,
//and FocuEventArgs's previousFocus) don't currently come through CacheReqest
//Debug.Assert(false, "Should always have runtimeID from cache at ctor.");
// false -> return null (instead of throwing) if not available; true->wrap
int [] val = LookupCachedValue(AutomationElement.RuntimeIdProperty, false, true) as int[];
if (val != null)
{
_runtimeId = val;
return _runtimeId;
}
// Possible that we got this element from a path that doesn't have prefetch
// enabled - fall back to getting RuntimeId the slow cross-proc way for now
// Also possible that this was called on an empty element - eg. where someone
// use TreeScope.Children to get just the children, but not any info for this
// element. CheckElement() will throw an exception in that case...
CheckElement();
_runtimeId = UiaCoreApi.UiaGetRuntimeId(_hnode);
return _runtimeId;
}
///
/// Get element at specified point on current desktop
///
/// point in screen coordinates
/// element at specified point
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FromPoint(Point pt)
{
return DrillForPointOrFocus(true, pt, CacheRequest.CurrentUiaCacheRequest);
}
///
/// Get element from specified HWND
///
/// Handle of window to get element for
/// element representing root node of specified window
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FromHandle(IntPtr hwnd)
{
Misc.ValidateArgument(hwnd != IntPtr.Zero, SRID.HwndMustBeNonNULL);
SafeNodeHandle hnode = UiaCoreApi.UiaNodeFromHandle(hwnd);
if (hnode.IsInvalid)
{
return null;
}
UiaCoreApi.UiaCacheRequest cacheRequest = CacheRequest.CurrentUiaCacheRequest;
// Don't do any normalization when getting updated cache...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
//
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
///
/// Converts a local IRawElementProvider implementation to an AutomationElement.
///
/// Local object implementing IRawElementProvider
/// A corresponding AutomationElement for the impl parameter
/// This would be used by a client helper library that wanted
/// to allow its callers to access its own native element type via PAW.
/// For example, the Windows Client Platform uses its own Element type, but
/// uses this iternally so that it can had back an AutomationElement to clients
/// that want to get an AutomationElement directly from an Element.
///
public static AutomationElement FromLocalProvider(IRawElementProviderSimple localImpl)
{
Misc.ValidateArgumentNonNull(localImpl, "localImpl");
return AutomationElement.Wrap(UiaCoreApi.UiaNodeFromProvider(localImpl));
}
///
/// Get current value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Returns value of specified property
///
/// If the specified property is not explicitly supported by the target UI,
/// a default value will be returned. For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCurrentPropertyValue
/// for that property will return an empty string.
///
/// This API gets the current value of the property at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access values in this AutomationElement's
/// cache, use GetCachedPropertyValue instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPropertyValue(AutomationProperty property)
{
return GetCurrentPropertyValue(property, false);
}
///
/// Get the current value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Specifies whether a default value should be
/// ignored if the specified property is supported by the target UI
/// Returns value of specified property, or AutomationElement.NotSupported
///
/// This API gets the current value of the property at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access values in this AutomationElement's
/// cache, use GetCachedPropertyValue instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPropertyValue(AutomationProperty property, bool ignoreDefaultValue)
{
Misc.ValidateArgumentNonNull(property, "property");
CheckElement();
AutomationPropertyInfo pi;
if (!Schema.GetPropertyInfo(property, out pi))
{
return new ArgumentException(SR.Get(SRID.UnsupportedProperty));
}
object value;
// PRESHARP will flag this as warning 56506/6506:Parameter 'property' to this public method must be validated: A null-dereference can occur here.
// False positive, property is checked, see above
#pragma warning suppress 6506
UiaCoreApi.UiaGetPropertyValue(_hnode, property.Id, out value);
if (value != AutomationElement.NotSupported)
{
//
if (value != null && pi.ObjectConverter != null)
{
value = pi.ObjectConverter(value);
}
}
else
{
if (ignoreDefaultValue)
{
value = AutomationElement.NotSupported;
}
else
{
value = Schema.GetDefaultValue(property);
}
}
return value;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Returns the pattern as an object, if currently supported
///
/// Throws InvalidOperationException if the pattern is not supported.
///
/// This API gets the pattern based on availability at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access patterns in this AutomationElement's
/// cache, use GetCachedPattern instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCurrentPattern(AutomationPattern pattern)
{
object retObject;
if (!TryGetCurrentPattern(pattern, out retObject))
{
throw new InvalidOperationException(SR.Get(SRID.UnsupportedPattern));
}
return retObject;
}
///
/// Get a pattern class from this object
///
/// an object repressenting the AutomationPattern indicating
/// the pattern to return
/// the returned pattern object will be an object
/// implementing the control pattern interface if the pattern is supported else
/// the object will be null.
/// Returns true, if currently supported
///
/// This API gets the pattern based on availability at this point in time,
/// without checking the cache. For some types of UI, this API will incur
/// a cross-process performance hit. To access patterns in this AutomationElement's
/// cache, use GetCachedPattern instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetCurrentPattern(AutomationPattern pattern, out object patternObject)
{
patternObject = null;
Misc.ValidateArgumentNonNull(pattern, "pattern");
CheckElement();
// Need to catch non-critical exceptions. The WinFormsSpinner will raise an
// InvalidOperationException if it is a domain spinner and the SelectionPattern is asked for.
SafePatternHandle hpatternobj = null;
try
{
hpatternobj = UiaCoreApi.UiaGetPatternProvider(_hnode, pattern.Id);
}
catch (Exception e)
{
if (Misc.IsCriticalException(e))
{
throw e;
}
return false;
}
if (hpatternobj.IsInvalid)
{
return false;
}
patternObject = Misc.WrapInterfaceOnClientSide(this, hpatternobj, pattern);
return patternObject != null;
}
///
/// Get cached value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Returns value of specified property
///
/// Throws InvalidOperationException if the requested property was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// If the specified property is not explicitly supported by the target UI,
/// a default value will be returned. For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCachedPropertyValue
/// for that property will return an empty string.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPropertyValue(AutomationProperty property)
{
return GetCachedPropertyValue(property, false);
}
///
/// Get the cached value of specified property from an element.
///
/// AutomationProperty that identifies the property
/// Specifies whether a default value should be
/// ignored if the specified property is not supported by the target UI
/// Returns value of specified property, or AutomationElement.NotSupported
///
/// Throws InvalidOperationException if the requested property was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// If ignoreDefaultValue is true, then when the specified property is not
/// explicitly supported by the target UI, a default value will not be returned.
/// For example, if the target UI doesn't
/// support the AutomationElement.NameProperty, calling GetCachedPropertyValue
/// for that property will return an empty string.
/// When ignoreDefaultValue is true, the value AutomationElement.NotSupported will
/// be returned instead.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPropertyValue(AutomationProperty property, bool ignoreDefaultValue)
{
Misc.ValidateArgumentNonNull(property, "property");
// true -> throw if not available, true -> wrap
object val = LookupCachedValue(property, true, true);
UiaCoreApi.IsErrorMarker(val, true/*throwException*/);
if (val == AutomationElement.NotSupported && !ignoreDefaultValue)
{
val = Schema.GetDefaultValue(property);
}
return val;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Returns the pattern as an object, if currently supported; otherwise returns null/
///
/// Throws InvalidOperationException if the requested pattern was not
/// previously specified to be pre-fetched using a CacheRequest.
///
/// This API gets the pattern from the cache.
///
///
///
/// This API does not work inside the secure execution environment.
///
public object GetCachedPattern(AutomationPattern pattern)
{
object patternObject;
if (!TryGetCachedPattern(pattern, out patternObject))
{
throw new InvalidOperationException(SR.Get(SRID.UnsupportedPattern));
}
return patternObject;
}
///
/// Get a pattern class from this object
///
/// AutomationPattern indicating the pattern to return
/// Is the pattern as an object, if currently in the cache; otherwise is null
/// Returns true, if currently in the cache; otherwise returns false
///
/// This API gets the pattern from the cache.
///
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetCachedPattern(AutomationPattern pattern, out object patternObject)
{
patternObject = null;
// Lookup a cached remote reference - but even if we get
// back null, still go ahead an create a pattern wrapper
// to provide access to cached properties
Misc.ValidateArgumentNonNull(pattern, "pattern");
// false -> don't throw, false -> don't wrap
object obj = LookupCachedValue(pattern, false, false);
if (obj == null)
{
return false;
}
SafePatternHandle hPattern = (SafePatternHandle)obj;
AutomationPatternInfo pi;
if (!Schema.GetPatternInfo(pattern, out pi))
{
throw new ArgumentException(SR.Get(SRID.UnsupportedPattern));
}
patternObject = pi.ClientSideWrapper(this, hPattern, true);
return patternObject != null;
}
///
/// Get an AutomationElement with updated cached values
///
/// CacheRequest object describing the properties and other information to fetch
/// Returns a new AutomationElement, which refers to the same UI as this element, but which is
/// populated with properties specified in the CacheRequest.
///
/// Unlike other methods, such as FromHandle, FromPoint, this method takes
/// an explicit CacheRequest as a parameter, and ignores the currently
/// active CacheRequest.
///
public AutomationElement GetUpdatedCache(CacheRequest request)
{
Misc.ValidateArgumentNonNull(request, "request");
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest = request.GetUiaCacheRequest();
// Don't normalize when getting updated cache...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(_hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
///
/// Find first child or descendant element that matches specified condition
///
/// Indicates whether to include this element, children
/// or descendants in the search
/// Condition to search for
/// Returns first element that satisfies condition,
/// or null if no match is found.
public AutomationElement FindFirst(TreeScope scope, Condition condition)
{
Misc.ValidateArgumentNonNull(condition, "condition");
UiaCoreApi.UiaCacheResponse[] responses = Find(scope, condition, CacheRequest.CurrentUiaCacheRequest, true, null);
if (responses.Length < 1)
{
return null;
}
Debug.Assert(responses.Length == 1);
return CacheHelper.BuildAutomationElementsFromResponse(CacheRequest.CurrentUiaCacheRequest, responses[0]);
}
///
/// Find all child or descendant elements that match specified condition
///
/// Indicates whether to include this element, children
/// or descendants in the search
/// Condition to search for
/// Returns collection of all AutomationElements that
/// match specified condition. Collection will be empty if
/// no matches found.
public AutomationElementCollection FindAll(TreeScope scope, Condition condition)
{
Misc.ValidateArgumentNonNull(condition, "condition");
UiaCoreApi.UiaCacheRequest request = CacheRequest.CurrentUiaCacheRequest;
UiaCoreApi.UiaCacheResponse[] responses = Find(scope, condition, request, false, null);
AutomationElement[] els = new AutomationElement[responses.Length];
for( int i = 0 ; i < responses.Length ; i ++ )
{
els[i] = CacheHelper.BuildAutomationElementsFromResponse(request, responses[i]);
}
return new AutomationElementCollection( els );
}
///
/// Get array of supported property identifiers
///
///
/// The returned array contains at least all the properties supported by this element;
/// however it may also contain duplicate entries or properties that the element does not
/// currently support or which have null or empty values. Use GetPropertyValue to determine
/// whether a property is currently supported and to determine what its current value is.
///
///
///
/// This API does not work inside the secure execution environment.
///
public AutomationProperty [ ] GetSupportedProperties()
{
CheckElement();
ArrayList propArrays = new ArrayList(4);
propArrays.Add(Schema.GetBasicProperties());
AutomationPattern[] patterns = GetSupportedPatterns();
if (patterns != null && patterns.Length > 0)
{
foreach (AutomationPattern pattern in patterns)
{
AutomationPatternInfo pi;
if (Schema.GetPatternInfo(pattern, out pi))
{
if (pi.Properties != null)
{
propArrays.Add(pi.Properties);
}
}
}
}
return (AutomationProperty[])Misc.RemoveDuplicates(Misc.CombineArrays(propArrays, typeof(AutomationProperty)), typeof(AutomationProperty));
}
///
/// Get the interfaces that this object supports
///
/// An array of AutomationPatterns that represent the supported interfaces
///
///
/// This API does not work inside the secure execution environment.
///
public AutomationPattern [ ] GetSupportedPatterns()
{
CheckElement();
ArrayList interfaces = new ArrayList(4);
object patternObject;
foreach (AutomationPatternInfo pi in Schema.GetPatternInfoTable())
{
if (TryGetCurrentPattern(pi.ID, out patternObject))
{
interfaces.Add(pi.ID);
}
}
return (AutomationPattern[])interfaces.ToArray(typeof(AutomationPattern));
}
///
/// Request to set focus to this element
///
///
///
/// This API does not work inside the secure execution environment.
///
public void SetFocus()
{
CheckElement();
object canReceiveFocus = GetCurrentPropertyValue(AutomationElement.IsKeyboardFocusableProperty);
if (canReceiveFocus is bool && (bool)canReceiveFocus)
{
UiaCoreApi.UiaSetFocus(_hnode);
}
else
{
throw new InvalidOperationException(SR.Get(SRID.SetFocusFailed));
}
}
///
/// Get a point that can be clicked on. If there is no ClickablePoint return false
///
/// A point that can be used ba a client to click on this LogicalElement
/// true if there is point that is clickable
///
///
/// This API does not work inside the secure execution environment.
///
public bool TryGetClickablePoint( out Point pt )
{
// initialize point here so if we return false its initialized
pt = new Point (0, 0);
// Request the provider for a clickable point.
object ptClickable = GetCurrentPropertyValue(AutomationElement.ClickablePointProperty);
if (ptClickable == NotSupported)
{
return false;
}
// if got one
if (ptClickable is Point)
{
//If the ClickablePointProperty from the provider is NaN that means no point.
if (double.IsNaN (((Point) ptClickable).X) || double.IsNaN (((Point) ptClickable).Y))
{
return false;
}
// Allow the object if it is the element or a descentant...
AutomationElement scan = AutomationElement.FromPoint((Point)ptClickable);
while (scan != null)
{
if (scan == this)
{
pt = (Point)ptClickable;
return true;
}
scan = TreeWalker.RawViewWalker.GetParent(scan, CacheRequest.DefaultCacheRequest);
}
}
// the providers point is either no good or they did not have one so poke around
// trying to find one.
if (ClickablePoint.HitTestForClickablePoint( (AutomationElement)this, out pt) )
return true;
return false;
}
///
/// Get a point that can be clicked on. This throws the NoClickablePointException if there is no clickable point
///
/// A point that can be used by a client to click on this LogicalElement
/// If there is not clickable point for this element
///
///
/// This API does not work inside the secure execution environment.
///
public Point GetClickablePoint()
{
Point pt;
if ( !TryGetClickablePoint( out pt ) )
throw new NoClickablePointException(SR.Get(SRID.LogicalElementNoClickablePoint));
return pt;
}
#endregion Public Methods
//-----------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
///
/// Get root element for current desktop
///
/// root element for current desktop
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement RootElement
{
get
{
SafeNodeHandle hnode = UiaCoreApi.UiaGetRootNode();
UiaCoreApi.UiaCacheRequest cacheRequest = CacheRequest.CurrentUiaCacheRequest;
// Don't normalize...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(hnode, cacheRequest, UiaCoreApi.NormalizeState.None, null);
//
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
}
///
/// Return the currently focused element
///
///
///
/// This API does not work inside the secure execution environment.
///
public static AutomationElement FocusedElement
{
get
{
//CASRemoval:AutomationPermission.Demand(AutomationPermissionFlag.Read);
return DrillForPointOrFocus(false, new Point(0, 0), CacheRequest.CurrentUiaCacheRequest);
}
}
///
/// This member allows access to previously requested
/// cached properties for this element. The returned object
/// has accessors for AutomationElement properties.
///
///
/// Cached property values must have been previously requested
/// using a CacheRequest. If you try to access a cached
/// property that was not previously requested, an InvalidOperation
/// Exception will be thrown.
///
/// To get the value of a property at the current point in time,
/// access the property via the Current accessor instead of
/// Cached.
///
public AutomationElementInformation Cached
{
get
{
return new AutomationElementInformation(this, true);
}
}
///
/// This member allows access to current property values
/// for this element. The returned object has accessors for
/// AutomationElement properties.
///
///
/// This AutomationElement must have a
/// Full reference in order to get current values. If the
/// AutomationElement was obtained using AutomationElementMode.None,
/// then it contains only cached data, and attempting to get
/// the current value of any property will throw an InvalidOperationException.
///
/// To get the cached value of a property that was previously
/// specified using a CacheRequest, access the property via the
/// Cached accessor instead of Current.
///
public AutomationElementInformation Current
{
get
{
return new AutomationElementInformation(this, false);
}
}
///
/// Returns the cached parent of this AutomationElement
///
///
/// Returns the parent of this element, with respect to the TreeFilter
/// condition of the CacheRequest that was active when this AutomationElement
/// was obtained.
///
/// Throws InvalidOperationException if the parent was not previously requested
/// in a CacheRequest.
///
/// Can return null if the specified element has no parent - eg. is the root node.
///
public AutomationElement CachedParent
{
get
{
// this is used as a marker to indicate 'not requested'
// - used since null is a valid value for parent, but this can never be.
// Use (object) case to ensure we just do a ref check here, not call .Equals
if ((object)_cachedParent == (object)this)
{
// PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions
// We've spec'd as throwing an Exception, and that's what we do PreSharp shouldn't complain
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
return _cachedParent;
}
}
///
/// Returns the cached children of this AutomationElement
///
///
/// Returns a collection of children of this element, with respect to the TreeFilter
/// condition of the CacheRequest that was active when this AutomationElement
/// was obtained.
///
/// Throws InvalidOperationException if children or descendants were not previously requested
/// in a CacheRequest.
///
/// Can return an empty collection if this AutomationElement has no children.
///
public AutomationElementCollection CachedChildren
{
get
{
// this is used as a marker to indicate 'not requested'
// - used since null is a valid value for parent, but this can never be.
// Use (object) case to ensure we just do a ref check here, not call .Equals
if ((object)_cachedFirstChild == (object)this)
{
// PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions
// We've spec'd as throwing an Exception, and that's what we do PreSharp shouldn't complain
#pragma warning suppress 6503
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
// Build up an array to return - first count the children,
// then build an array and populate it...
int childCount = 0;
AutomationElement scan = _cachedFirstChild;
for (; scan != null; scan = scan._cachedNextSibling)
{
childCount++;
}
AutomationElement[] children = new AutomationElement[childCount];
scan = _cachedFirstChild;
for (int i = 0; i < childCount; i++)
{
children[i] = scan;
scan = scan._cachedNextSibling;
}
return new AutomationElementCollection(children);
}
}
#endregion Public Properties
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal void CheckElement()
{
if (_hnode == null || _hnode.IsInvalid)
{
throw new InvalidOperationException(SR.Get(SRID.CacheRequestNeedElementReference));
}
}
// Called by the treewalker classes to navigate - we call through to the
// provider wrapper, which gets the navigator code to do its stuff
internal AutomationElement Navigate(NavigateDirection direction, Condition condition, CacheRequest request)
{
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest;
if (request == null)
cacheRequest = CacheRequest.DefaultUiaCacheRequest;
else
cacheRequest = request.GetUiaCacheRequest();
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaNavigate(_hnode, direction, condition, cacheRequest);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
internal AutomationElement Normalize(Condition condition, CacheRequest request )
{
CheckElement();
UiaCoreApi.UiaCacheRequest cacheRequest;
if (request == null)
cacheRequest = CacheRequest.DefaultUiaCacheRequest;
else
cacheRequest = request.GetUiaCacheRequest();
// Normalize against the treeview condition, not the one in the cache request...
UiaCoreApi.UiaCacheResponse response = UiaCoreApi.UiaGetUpdatedCache(_hnode, cacheRequest, UiaCoreApi.NormalizeState.Custom, condition);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
// Used by the pattern wrappers to get property values
internal object GetPatternPropertyValue(AutomationProperty property, bool useCache)
{
if (useCache)
return GetCachedPropertyValue(property);
else
return GetCurrentPropertyValue(property);
}
// The following are used by CacheUtil when building up a cached AutomationElemen tree
internal void SetCachedParent(AutomationElement cachedParent)
{
_cachedParent = cachedParent;
// If we're setting the parent, it means this is one of potentially
// many siblings - so set _cachedNextSibling to null, instead of
// the 'not requested' marker value 'this'
_cachedNextSibling = null;
}
internal void SetCachedFirstChild(AutomationElement cachedFirstChild)
{
_cachedFirstChild = cachedFirstChild;
}
internal void SetCachedNextSibling(AutomationElement cachedNextSibling)
{
_cachedNextSibling = cachedNextSibling;
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal SafeNodeHandle RawNode
{
get
{
return _hnode;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Lookup a cached AutomationPattern or AutomationProperty
object LookupCachedValue(AutomationIdentifier id, bool throwIfNotRequested, bool wrap)
{
if (_cachedValues == null)
{
if (throwIfNotRequested)
{
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
else
{
return null;
}
}
AutomationProperty automationProperty = id as AutomationProperty;
bool isProperty = automationProperty != null;
AutomationIdentifier[] refTable = isProperty ? (AutomationIdentifier[])_request.Properties
: (AutomationIdentifier[])_request.Patterns;
bool found = false;
object val = null;
int dataOffset = isProperty ? 1 : 1 + _request.Properties.Length;
for (int i = 0; i < refTable.Length; i++)
{
if (refTable[i] == id)
{
found = true;
val = _cachedValues[_cachedValuesIndex, i + dataOffset];
break;
}
}
if (!found)
{
if (throwIfNotRequested)
{
throw new InvalidOperationException(SR.Get(SRID.CachedPropertyNotRequested));
}
else
{
return null;
}
}
// Bail now if no wrapping required; also, even with wrapping, null remains null
// for both properties and patterns..
if (!wrap || val == null)
{
return val;
}
AutomationPattern automationPattern = id as AutomationPattern;
// Cached values are internally stored as unwrapped, direct-from-provider values, so
// need to be wrapped as appropriate before handing back to client...
if (automationPattern != null)
{
SafePatternHandle hpatternobj = (SafePatternHandle)val;
val = Misc.WrapInterfaceOnClientSide(this, hpatternobj, automationPattern);
}
// No wrapping necessary here for properties - the objects in the array are fully wrapped/converted as soon as they are
// received from the unmanaged API, so they're ready-to-use without any further processing.
return val;
}
// drill for either focused raw element, or element at specified point
private static AutomationElement DrillForPointOrFocus(bool atPoint, Point pt, UiaCoreApi.UiaCacheRequest cacheRequest)
{
UiaCoreApi.UiaCacheResponse response;
if (atPoint)
response = UiaCoreApi.UiaNodeFromPoint(pt.X, pt.Y, cacheRequest);
else
response = UiaCoreApi.UiaNodeFromFocus(cacheRequest);
return CacheHelper.BuildAutomationElementsFromResponse(cacheRequest, response);
}
// called by FindFirst and FindAll
private UiaCoreApi.UiaCacheResponse[] Find(TreeScope scope, Condition condition, UiaCoreApi.UiaCacheRequest request, bool findFirst, BackgroundWorker worker)
{
Misc.ValidateArgumentNonNull(condition, "condition");
if (scope == 0)
{
throw new ArgumentException(SR.Get(SRID.TreeScopeNeedAtLeastOne));
}
if ((scope & ~(TreeScope.Element | TreeScope.Children | TreeScope.Descendants)) != 0)
{
throw new ArgumentException(SR.Get(SRID.TreeScopeElementChildrenDescendantsOnly));
}
// Set up a find struct...
UiaCoreApi.UiaFindParams findParams = new UiaCoreApi.UiaFindParams();
findParams.FindFirst = findFirst;
if ((scope & TreeScope.Descendants) != 0)
findParams.MaxDepth = -1;
else if ((scope & TreeScope.Children) != 0)
findParams.MaxDepth = 1;
else
findParams.MaxDepth = 0;
if ((scope & TreeScope.Element) != 0)
findParams.ExcludeRoot = false;
else
findParams.ExcludeRoot = true;
UiaCoreApi.UiaCacheResponse[] retVal = UiaCoreApi.UiaFind(_hnode, findParams, condition, request);
return retVal;
}
#endregion Private Methods
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
private SafeNodeHandle _hnode;
private int[] _runtimeId;
// Cached object values - use in conjunction with the Properties/Pattern arrays in
// _request to figure out which properties/patterns they are.
// Note that these use NotSupported, so need to substitute default values
// when returning to user.
private object[,] _cachedValues;
private int _cachedValuesIndex; // index of row in cachedValues that corresponds to this element
// Reference to the cache request information that was active when this
// element was created
private UiaCoreApi.UiaCacheRequest _request;
// Cached structure links - these set to 'this' to indicate that they
// were not requested - since null is a valid value.
private AutomationElement _cachedParent;
private AutomationElement _cachedFirstChild;
private AutomationElement _cachedNextSibling;
#endregion Private Fields
//------------------------------------------------------
//
// Nested Classes
//
//-----------------------------------------------------
#region Nested Classes
///
/// This class provides access to either Cached or Current
/// properties on an AutomationElement via the .Cached or
/// .Current accessors.
///
public struct AutomationElementInformation
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
internal AutomationElementInformation(AutomationElement el, bool useCache)
{
_el = el;
_useCache = useCache;
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
/// The ControlType of this Element
public ControlType ControlType { get { return (ControlType) _el.GetPatternPropertyValue(ControlTypeProperty, _useCache); } }
/// Localized control type description (eg. "Button")
public string LocalizedControlType { get { return (string) _el.GetPatternPropertyValue(LocalizedControlTypeProperty, _useCache); } }
/// Name of this instance of control
public string Name { get { return (string) _el.GetPatternPropertyValue(NameProperty, _useCache); } }
/// Hot-key equivalent for this command item. (eg. Ctrl-P for Print)
public string AcceleratorKey { get { return (string) _el.GetPatternPropertyValue(AcceleratorKeyProperty, _useCache); } }
/// Keys used to move focus to this control
public string AccessKey { get { return (string) _el.GetPatternPropertyValue(AccessKeyProperty, _useCache); } }
/// Indicates whether this control has keyboard focus
public bool HasKeyboardFocus { get { return (bool) _el.GetPatternPropertyValue(HasKeyboardFocusProperty, _useCache); } }
/// True if this control can take keyboard focus
public bool IsKeyboardFocusable { get { return (bool) _el.GetPatternPropertyValue(IsKeyboardFocusableProperty, _useCache); } }
/// True if this control is enabled
public bool IsEnabled { get { return (bool) _el.GetPatternPropertyValue(IsEnabledProperty, _useCache); } }
/// Bounding rectangle, in screen coordinates
public Rect BoundingRectangle { get { return (Rect) _el.GetPatternPropertyValue(BoundingRectangleProperty, _useCache); } }
/// HelpText - brief description of what this control does
public string HelpText { get { return (string) _el.GetPatternPropertyValue(HelpTextProperty, _useCache); } }
/// Indicates that this element should be included in the Control view of the tree
public bool IsControlElement { get { return (bool) _el.GetPatternPropertyValue(IsControlElementProperty, _useCache); } }
/// Indicates that this element should be included in the Content view of the tree
public bool IsContentElement { get { return (bool) _el.GetPatternPropertyValue(IsContentElementProperty, _useCache); } }
/// The AutomationElement that labels this element
public AutomationElement LabeledBy { get { return (AutomationElement) _el.GetPatternPropertyValue(LabeledByProperty, _useCache); } }
/// The identifier for an element that is unique within its containing element
public string AutomationId { get { return (string) _el.GetPatternPropertyValue(AutomationIdProperty, _useCache); } }
/// Localized string that indicates what the items in a list represent
public string ItemType { get { return (string) _el.GetPatternPropertyValue(ItemTypeProperty, _useCache ); } }
/// True if the control is a password protected field.
public bool IsPassword { get { return (bool) _el.GetPatternPropertyValue(IsPasswordProperty, _useCache); } }
/// Name of underlying class - implementation dependant, but useful for test
public string ClassName { get { return (string) _el.GetPatternPropertyValue(ClassNameProperty, _useCache); } }
/// Window Handle, if the underlying control is a Window
public int NativeWindowHandle { get { return (int) _el.GetPatternPropertyValue(NativeWindowHandleProperty, _useCache); } }
/// Id of process that this element lives in
public int ProcessId { get { return (int) _el.GetPatternPropertyValue(ProcessIdProperty, _useCache); } }
/// True if this control is not visible to the sighted user
public bool IsOffscreen { get { return (bool) _el.GetPatternPropertyValue(IsOffscreenProperty, _useCache); } }
/// The controls specfied direction
public OrientationType Orientation { get { return (OrientationType) _el.GetPatternPropertyValue(OrientationProperty, _useCache); } }
/// The controls specfied direction
public string FrameworkId { get { return (string) _el.GetPatternPropertyValue(FrameworkIdProperty, _useCache); } }
/// True if this element is required to be filled out on a form
public bool IsRequiredForForm { get { return (bool) _el.GetPatternPropertyValue(IsRequiredForFormProperty, _useCache); } }
/// The visual status of a complex item as a string
public string ItemStatus { get { return (string) _el.GetPatternPropertyValue(ItemStatusProperty, _useCache); } }
#endregion Public Properties
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private AutomationElement _el; // AutomationElement that contains the cache or live reference
private bool _useCache; // true to use cache, false to use live reference to get current values
#endregion Private Fields
}
#endregion Nested Classes
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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