Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / CursorConverter.cs / 1305376 / CursorConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Diagnostics; using Microsoft.Win32; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Globalization; using System.Reflection; using System.IO; ////// /// CursorConverter is a class that can be used to convert /// colors from one data type to another. Access this /// class through the TypeDescriptor. /// public class CursorConverter : TypeConverter { private StandardValuesCollection values; ////// /// Determines if this converter can convert an object in the given source /// type to the native type of the converter. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string) || sourceType == typeof(byte[])) { return true; } return base.CanConvertFrom(context, sourceType); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(byte[])) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// Converts the given object to the converter's native type. /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string text = ((string)value).Trim(); PropertyInfo[] props = GetProperties(); for (int i = 0; i < props.Length; i++) { PropertyInfo prop = props[i]; if (string.Equals(prop.Name, text, StringComparison.OrdinalIgnoreCase) ){ object[] tempIndex = null; return prop.GetValue(null, tempIndex); } } } if (value is byte[]) { MemoryStream ms = new MemoryStream((byte[])value); return new Cursor(ms); } return base.ConvertFrom(context, culture, value); } ////// /// Converts the given object to another type. The most common types to convert /// are to and from a string object. The default implementation will make a call /// to ToString on the object if the object is valid and if the destination /// type is string. If this cannot convert to the desitnation type, this will /// throw a NotSupportedException. /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string) && value != null) { PropertyInfo[] props = GetProperties(); int bestMatch = -1; for (int i = 0; i < props.Length; i++) { PropertyInfo prop = props[i]; object[] tempIndex = null; Cursor c = (Cursor)prop.GetValue(null, tempIndex); if (c == (Cursor)value) { if (Object.ReferenceEquals(c, value)) { return prop.Name; } else { bestMatch = i; } } } if (bestMatch != -1) { return props[bestMatch].Name; } // We throw here because we cannot meaningfully convert a custom // cursor into a string. In fact, the ResXResourceWriter will use // this exception to indicate to itself that this object should // be serialized through ISeriazable instead of a string. // throw new FormatException(SR.GetString(SR.CursorCannotCovertToString)); } if (destinationType == typeof(InstanceDescriptor) && value is Cursor) { PropertyInfo[] props = GetProperties(); foreach(PropertyInfo prop in props) { if (prop.GetValue(null, null) == value) { return new InstanceDescriptor(prop, null); } } } if (destinationType == typeof(byte[])) { if (value != null) { MemoryStream ms = new MemoryStream(); Cursor cursor = (Cursor)value; cursor.SavePicture(ms); ms.Close(); return ms.ToArray(); } else return new byte[0]; } return base.ConvertTo(context, culture, value, destinationType); } ////// /// Retrieves the properties for the available cursors. /// private PropertyInfo[] GetProperties() { return typeof(Cursors).GetProperties(BindingFlags.Static | BindingFlags.Public); } ////// /// Retrieves a collection containing a set of standard values /// for the data type this validator is designed for. This /// will return null if the data type does not support a /// standard set of values. /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { if (values == null) { ArrayList list = new ArrayList(); PropertyInfo[] props = GetProperties(); for (int i = 0; i < props.Length; i++) { PropertyInfo prop = props[i]; object[] tempIndex = null; Debug.Assert(prop.GetValue(null, tempIndex) != null, "Property " + prop.Name + " returned NULL"); list.Add(prop.GetValue(null, tempIndex)); } values = new StandardValuesCollection(list.ToArray()); } return values; } ////// /// Determines if this object supports a standard set of values /// that can be picked from a list. /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PathFigureCollection.cs
- AsymmetricKeyExchangeFormatter.cs
- AppDomainGrammarProxy.cs
- HwndSubclass.cs
- CommentEmitter.cs
- Dispatcher.cs
- ComplexObject.cs
- VarRemapper.cs
- NetTcpSecurity.cs
- ForeignKeyConstraint.cs
- DataGridViewCheckBoxCell.cs
- TextTreeRootTextBlock.cs
- DriveNotFoundException.cs
- CmsInterop.cs
- WebPartUserCapability.cs
- XmlAnyElementAttributes.cs
- IndexingContentUnit.cs
- MultiSelectRootGridEntry.cs
- AuthenticateEventArgs.cs
- ReachIDocumentPaginatorSerializerAsync.cs
- FlowDocumentView.cs
- SqlParameter.cs
- AutoResetEvent.cs
- RenderCapability.cs
- CultureInfo.cs
- BlobPersonalizationState.cs
- ClientTarget.cs
- XPathSelectionIterator.cs
- ProjectionRewriter.cs
- TypeTypeConverter.cs
- PresentationSource.cs
- WindowsIdentity.cs
- XmlBufferReader.cs
- TableHeaderCell.cs
- WorkflowDebuggerSteppingAttribute.cs
- MsmqVerifier.cs
- XmlReader.cs
- SqlProfileProvider.cs
- OrderingQueryOperator.cs
- DesignerActionItemCollection.cs
- WindowsUserNameSecurityTokenAuthenticator.cs
- IndicFontClient.cs
- AmbientLight.cs
- SimpleApplicationHost.cs
- StorageScalarPropertyMapping.cs
- SymbolEqualComparer.cs
- CodeAttachEventStatement.cs
- BindStream.cs
- SizeChangedEventArgs.cs
- DynamicValidatorEventArgs.cs
- WeakReferenceList.cs
- EmbeddedMailObjectsCollection.cs
- ProtectedConfiguration.cs
- ActivityBuilderHelper.cs
- SubpageParagraph.cs
- MgmtConfigurationRecord.cs
- TreeNodeBinding.cs
- ObjectDataSourceDisposingEventArgs.cs
- MachineSettingsSection.cs
- AllMembershipCondition.cs
- SqlDesignerDataSourceView.cs
- StylusPointPropertyInfo.cs
- Renderer.cs
- RemoteWebConfigurationHost.cs
- StyleSheet.cs
- Resources.Designer.cs
- DataKey.cs
- DataBinder.cs
- TraceSection.cs
- ClientRuntimeConfig.cs
- CultureSpecificStringDictionary.cs
- DataPagerFieldCollection.cs
- InProcStateClientManager.cs
- SafeThreadHandle.cs
- ResumeStoryboard.cs
- TransactionChannelFaultConverter.cs
- Command.cs
- SessionStateSection.cs
- ZoneIdentityPermission.cs
- ChangeTracker.cs
- OleDbDataReader.cs
- PaperSource.cs
- SmtpClient.cs
- TdsParameterSetter.cs
- CaseInsensitiveHashCodeProvider.cs
- DiscoveryMessageSequenceGenerator.cs
- GenericAuthenticationEventArgs.cs
- RemoteX509AsymmetricSecurityKey.cs
- EntityCommandDefinition.cs
- TreeNodeClickEventArgs.cs
- TypeCacheManager.cs
- RadioButtonBaseAdapter.cs
- UserNamePasswordValidationMode.cs
- ResourceDescriptionAttribute.cs
- RefType.cs
- ClientApiGenerator.cs
- OutputCacheModule.cs
- DataSourceCache.cs
- ThreadNeutralSemaphore.cs
- NgenServicingAttributes.cs