Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / UIAutomation / UIAutomationClient / MS / Internal / Automation / Accessible.cs / 1 / Accessible.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Wraps some of IAccessible to support Focus and top-level window creates // // History: // 06/02/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System.Windows.Automation; using System; using Accessibility; using System.Text; using System.Diagnostics; using MS.Win32; // PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas. #pragma warning disable 1634, 1691 namespace MS.Internal.Automation { internal class Accessible { internal Accessible(IAccessible acc, object child) { Debug.Assert(acc != null, "null IAccessible"); _acc = acc; _child = child; } // Create an Accessible object; may return null internal static Accessible Create( IntPtr hwnd, int idObject, int idChild ) { IAccessible acc = null; object child = null; if( UnsafeNativeMethods.AccessibleObjectFromEvent( hwnd, idObject, idChild, ref acc, ref child ) != 0 /*S_OK*/ || acc == null ) return null; // Per SDK must use the ppacc and pvarChild from AccessibleObjectFromEvent // to access information about this UI element. return new Accessible( acc, child ); } internal int State { get { try { return (int)_acc.get_accState(_child); } catch (Exception e) { if (IsCriticalMSAAException(e)) // PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions // Since this Property is internal, we CAN throw an exception #pragma warning suppress 6503 throw; return UnsafeNativeMethods.STATE_SYSTEM_UNAVAILABLE; } } } internal IntPtr Window { get { if (_hwnd == IntPtr.Zero) { try { if (UnsafeNativeMethods.WindowFromAccessibleObject(_acc, ref _hwnd) != 0/*S_OK*/) { _hwnd = IntPtr.Zero; } } catch( Exception e ) { if (IsCriticalMSAAException(e)) // PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions // Since this Property is internal, we CAN throw an exception #pragma warning suppress 6503 throw; _hwnd = IntPtr.Zero; } } return _hwnd; } } // miscellaneous functions used with Accessible internal static bool CompareClass(IntPtr hwnd, string szClass) { return ProxyManager.GetClassName(NativeMethods.HWND.Cast(hwnd)) == szClass; } internal static bool IsComboDropdown(IntPtr hwnd) { return CompareClass(hwnd, "ComboLBox"); } internal static bool IsStatic(IntPtr hwnd) { return CompareClass(hwnd, "Static"); } private bool IsCriticalMSAAException(Exception e) { // Some OLEACC proxies produce out-of-memory for non-critical reasons: // notably, the treeview proxy will raise this if the target HWND no longer exists, // GetWindowThreadProcessID fails and it therefore won't be able to allocate shared // memory in the target process, so it incorrectly assumes OOM. // Some Native impls (media player) return E_POINTER, which COM Interop translates // into NullRefException; need to ignore those too. // should ignore those return !(e is OutOfMemoryException) && !(e is NullReferenceException) && Misc.IsCriticalException(e); } private IntPtr _hwnd; private IAccessible _acc; private Object _child; } } // 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: Wraps some of IAccessible to support Focus and top-level window creates // // History: // 06/02/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System.Windows.Automation; using System; using Accessibility; using System.Text; using System.Diagnostics; using MS.Win32; // PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas. #pragma warning disable 1634, 1691 namespace MS.Internal.Automation { internal class Accessible { internal Accessible(IAccessible acc, object child) { Debug.Assert(acc != null, "null IAccessible"); _acc = acc; _child = child; } // Create an Accessible object; may return null internal static Accessible Create( IntPtr hwnd, int idObject, int idChild ) { IAccessible acc = null; object child = null; if( UnsafeNativeMethods.AccessibleObjectFromEvent( hwnd, idObject, idChild, ref acc, ref child ) != 0 /*S_OK*/ || acc == null ) return null; // Per SDK must use the ppacc and pvarChild from AccessibleObjectFromEvent // to access information about this UI element. return new Accessible( acc, child ); } internal int State { get { try { return (int)_acc.get_accState(_child); } catch (Exception e) { if (IsCriticalMSAAException(e)) // PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions // Since this Property is internal, we CAN throw an exception #pragma warning suppress 6503 throw; return UnsafeNativeMethods.STATE_SYSTEM_UNAVAILABLE; } } } internal IntPtr Window { get { if (_hwnd == IntPtr.Zero) { try { if (UnsafeNativeMethods.WindowFromAccessibleObject(_acc, ref _hwnd) != 0/*S_OK*/) { _hwnd = IntPtr.Zero; } } catch( Exception e ) { if (IsCriticalMSAAException(e)) // PRESHARP will flag this as a warning 56503/6503: Property get methods should not throw exceptions // Since this Property is internal, we CAN throw an exception #pragma warning suppress 6503 throw; _hwnd = IntPtr.Zero; } } return _hwnd; } } // miscellaneous functions used with Accessible internal static bool CompareClass(IntPtr hwnd, string szClass) { return ProxyManager.GetClassName(NativeMethods.HWND.Cast(hwnd)) == szClass; } internal static bool IsComboDropdown(IntPtr hwnd) { return CompareClass(hwnd, "ComboLBox"); } internal static bool IsStatic(IntPtr hwnd) { return CompareClass(hwnd, "Static"); } private bool IsCriticalMSAAException(Exception e) { // Some OLEACC proxies produce out-of-memory for non-critical reasons: // notably, the treeview proxy will raise this if the target HWND no longer exists, // GetWindowThreadProcessID fails and it therefore won't be able to allocate shared // memory in the target process, so it incorrectly assumes OOM. // Some Native impls (media player) return E_POINTER, which COM Interop translates // into NullRefException; need to ignore those too. // should ignore those return !(e is OutOfMemoryException) && !(e is NullReferenceException) && Misc.IsCriticalException(e); } private IntPtr _hwnd; private IAccessible _acc; private Object _child; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XmlBindingWorker.cs
- CacheMode.cs
- securitymgrsite.cs
- SponsorHelper.cs
- ScalarConstant.cs
- ServiceObjectContainer.cs
- SiteMapPath.cs
- SystemIPGlobalProperties.cs
- Font.cs
- Directory.cs
- SqlConnectionFactory.cs
- Style.cs
- BaseProcessor.cs
- EmbeddedMailObject.cs
- AssociationSetMetadata.cs
- TextWriterTraceListener.cs
- SoundPlayerAction.cs
- FloaterParagraph.cs
- TypeHelpers.cs
- SafeFileMappingHandle.cs
- FrameworkEventSource.cs
- GridViewColumn.cs
- UrlAuthFailedErrorFormatter.cs
- ExpressionBuilder.cs
- EncryptedPackageFilter.cs
- TypeUnloadedException.cs
- ConditionalBranch.cs
- ActivityInstanceReference.cs
- NonParentingControl.cs
- AttachedPropertyBrowsableForChildrenAttribute.cs
- EmptyStringExpandableObjectConverter.cs
- _BasicClient.cs
- UIInitializationException.cs
- ExecutorLocksHeldException.cs
- Column.cs
- TextServicesHost.cs
- Transform.cs
- SafeRegistryHandle.cs
- WMICapabilities.cs
- PrinterUnitConvert.cs
- PeerContact.cs
- RunClient.cs
- BindingSource.cs
- ProofTokenCryptoHandle.cs
- TextContainerHelper.cs
- Pens.cs
- MexHttpsBindingCollectionElement.cs
- ListViewDesigner.cs
- SiteMapSection.cs
- CachedPathData.cs
- ListSortDescription.cs
- OpenFileDialog.cs
- Storyboard.cs
- CurrentChangingEventManager.cs
- SaveFileDialogDesigner.cs
- SystemIPv6InterfaceProperties.cs
- PointLight.cs
- TypeNameConverter.cs
- RtfToXamlLexer.cs
- MenuCommandsChangedEventArgs.cs
- PathFigure.cs
- EnumUnknown.cs
- XPathNode.cs
- CorrelationActionMessageFilter.cs
- ValidatorCollection.cs
- SqlResolver.cs
- DBDataPermission.cs
- TypedOperationInfo.cs
- WebPartPersonalization.cs
- RangeValuePattern.cs
- CodeMemberProperty.cs
- XmlSchemaGroupRef.cs
- SineEase.cs
- OverloadGroupAttribute.cs
- DataGridViewButtonCell.cs
- LoginName.cs
- UncommonField.cs
- assertwrapper.cs
- MailHeaderInfo.cs
- JapaneseLunisolarCalendar.cs
- SupportsEventValidationAttribute.cs
- XmlSchemaGroupRef.cs
- BinaryFormatterWriter.cs
- ScrollViewer.cs
- ConditionValidator.cs
- XmlSchemaCompilationSettings.cs
- PenLineJoinValidation.cs
- EntityViewGenerationAttribute.cs
- HttpConfigurationSystem.cs
- PolicyChain.cs
- FileDataSourceCache.cs
- ButtonFlatAdapter.cs
- CapabilitiesAssignment.cs
- SizeKeyFrameCollection.cs
- FileFormatException.cs
- Emitter.cs
- GeometryCombineModeValidation.cs
- TypeUsage.cs
- AsnEncodedData.cs
- BoundConstants.cs