Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / CursorConverter.cs / 1 / 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. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WebReferenceCollection.cs
- DataAdapter.cs
- PassportAuthenticationModule.cs
- PeerToPeerException.cs
- Marshal.cs
- StreamGeometryContext.cs
- NavigationEventArgs.cs
- GridToolTip.cs
- OLEDB_Enum.cs
- Lease.cs
- OracleBFile.cs
- ObjectTag.cs
- DynamicILGenerator.cs
- CustomErrorCollection.cs
- ConfigurationCollectionAttribute.cs
- AssemblyName.cs
- ScriptControlManager.cs
- HostedHttpRequestAsyncResult.cs
- DataBindEngine.cs
- StrokeCollection.cs
- WebServiceFaultDesigner.cs
- SecurityElementBase.cs
- WindowsSecurityTokenAuthenticator.cs
- formatter.cs
- FolderBrowserDialog.cs
- Base64Stream.cs
- EntityDataSourceSelectedEventArgs.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- FormsAuthenticationTicket.cs
- RandomNumberGenerator.cs
- StrongNameUtility.cs
- EntityStoreSchemaGenerator.cs
- NamespaceCollection.cs
- Blend.cs
- WebHttpElement.cs
- DecimalStorage.cs
- DateTimeFormatInfo.cs
- Util.cs
- HtmlInputFile.cs
- DefaultSection.cs
- TabItem.cs
- LinqDataSourceInsertEventArgs.cs
- FactoryGenerator.cs
- DataGridColumnCollection.cs
- CellPartitioner.cs
- WebEvents.cs
- Column.cs
- Pkcs9Attribute.cs
- NetworkStream.cs
- ServiceModelSecurityTokenTypes.cs
- DataServiceHost.cs
- XmlBaseWriter.cs
- FindCriteriaCD1.cs
- TranslateTransform3D.cs
- ExtendedPropertyDescriptor.cs
- VarRemapper.cs
- Switch.cs
- OdbcTransaction.cs
- ActivationArguments.cs
- BufferedGraphics.cs
- TraceListener.cs
- Function.cs
- Atom10FormatterFactory.cs
- TreeWalker.cs
- HttpClientCertificate.cs
- ComplexPropertyEntry.cs
- ObjectDataSourceMethodEditor.cs
- StylusSystemGestureEventArgs.cs
- JpegBitmapDecoder.cs
- TreeViewImageIndexConverter.cs
- SHA384Managed.cs
- LinkLabel.cs
- StorageBasedPackageProperties.cs
- SqlParameterCollection.cs
- WebPartManager.cs
- GradientBrush.cs
- BamlRecordWriter.cs
- PreviewPrintController.cs
- ConfigXmlComment.cs
- MethodBuilder.cs
- PropertyIDSet.cs
- Brush.cs
- RowToFieldTransformer.cs
- ArrangedElement.cs
- QuotedPairReader.cs
- StubHelpers.cs
- AlphabeticalEnumConverter.cs
- ConfigXmlElement.cs
- StorageModelBuildProvider.cs
- RtfToken.cs
- TemplateKeyConverter.cs
- Application.cs
- TemplatePropertyEntry.cs
- AuthenticationServiceManager.cs
- WebBrowserEvent.cs
- EntityContainerEmitter.cs
- IgnorePropertiesAttribute.cs
- sqlinternaltransaction.cs
- CacheChildrenQuery.cs
- ColumnWidthChangedEvent.cs