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
- RegexRunner.cs
- StorageMappingFragment.cs
- QilDataSource.cs
- RecordsAffectedEventArgs.cs
- OrderPreservingPipeliningMergeHelper.cs
- CalendarDateRangeChangingEventArgs.cs
- FixedTextView.cs
- GeometryDrawing.cs
- PackageDigitalSignatureManager.cs
- MultilineStringConverter.cs
- WebServiceErrorEvent.cs
- Header.cs
- ApplicationSettingsBase.cs
- IteratorFilter.cs
- WebPartCatalogAddVerb.cs
- ValidationErrorEventArgs.cs
- EdmTypeAttribute.cs
- Barrier.cs
- ThreadStaticAttribute.cs
- Model3DGroup.cs
- UserUseLicenseDictionaryLoader.cs
- IntAverageAggregationOperator.cs
- ObjectListDesigner.cs
- UnauthorizedWebPart.cs
- DataServiceProcessingPipeline.cs
- VolatileResourceManager.cs
- QueryContext.cs
- DbModificationClause.cs
- EventNotify.cs
- DefaultAsyncDataDispatcher.cs
- CodeNamespaceCollection.cs
- MetadataCollection.cs
- LogWriteRestartAreaAsyncResult.cs
- QuaternionValueSerializer.cs
- CharKeyFrameCollection.cs
- Light.cs
- DecimalAnimation.cs
- ResourceExpressionBuilder.cs
- SafeCertificateStore.cs
- Exceptions.cs
- MultipartContentParser.cs
- SharedPersonalizationStateInfo.cs
- NamedPermissionSet.cs
- HttpProtocolReflector.cs
- IdentityReference.cs
- CodeParameterDeclarationExpressionCollection.cs
- FlatButtonAppearance.cs
- FacetEnabledSchemaElement.cs
- SingleBodyParameterMessageFormatter.cs
- MouseDevice.cs
- CustomWebEventKey.cs
- ProtocolsSection.cs
- _SingleItemRequestCache.cs
- SingleSelectRootGridEntry.cs
- CheckBoxPopupAdapter.cs
- Timer.cs
- Span.cs
- WizardPanel.cs
- WebReferencesBuildProvider.cs
- Rethrow.cs
- HttpException.cs
- NameObjectCollectionBase.cs
- FixedSOMElement.cs
- CompositeCollection.cs
- FlagsAttribute.cs
- CompModHelpers.cs
- EntryWrittenEventArgs.cs
- IConvertible.cs
- TypedDataSourceCodeGenerator.cs
- SoapSchemaImporter.cs
- KeyGesture.cs
- ApplicationProxyInternal.cs
- UInt16Converter.cs
- VideoDrawing.cs
- RotateTransform3D.cs
- SafeCryptHandles.cs
- StrongNameIdentityPermission.cs
- querybuilder.cs
- FileUtil.cs
- DataBindingCollection.cs
- QueryTask.cs
- GACIdentityPermission.cs
- ResponseBodyWriter.cs
- MulticastDelegate.cs
- Dump.cs
- MenuItem.cs
- ExpressionBuilder.cs
- RectangleF.cs
- DecoderBestFitFallback.cs
- FormViewInsertEventArgs.cs
- InputLanguageProfileNotifySink.cs
- BinaryReader.cs
- WebCategoryAttribute.cs
- GridViewCommandEventArgs.cs
- QueryCursorEventArgs.cs
- ControlSerializer.cs
- ProjectionCamera.cs
- DefaultTraceListener.cs
- IndexedEnumerable.cs
- ChannelEndpointElement.cs