Code:
/ DotNET / DotNET / 8.0 / 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
- BooleanStorage.cs
- PhonemeEventArgs.cs
- RSAOAEPKeyExchangeDeformatter.cs
- BuildProvider.cs
- PrePrepareMethodAttribute.cs
- Bind.cs
- ParserOptions.cs
- DragDrop.cs
- ChangeInterceptorAttribute.cs
- NonSerializedAttribute.cs
- ViewSimplifier.cs
- CalendarTable.cs
- CodeAttributeDeclarationCollection.cs
- TrackBarRenderer.cs
- Filter.cs
- Model3D.cs
- HeaderedContentControl.cs
- Evidence.cs
- FormClosedEvent.cs
- FlowDocumentPageViewerAutomationPeer.cs
- VisualBrush.cs
- TagPrefixAttribute.cs
- XPathNodeList.cs
- DefaultValueMapping.cs
- _AutoWebProxyScriptWrapper.cs
- XmlAutoDetectWriter.cs
- ContextMarshalException.cs
- DataSpaceManager.cs
- XmlHierarchicalDataSourceView.cs
- ConfigsHelper.cs
- TextBounds.cs
- CompositionCommandSet.cs
- MessageTransmitTraceRecord.cs
- GPPOINTF.cs
- CfgParser.cs
- CodeObject.cs
- PathTooLongException.cs
- KeyEventArgs.cs
- XPathScanner.cs
- RemotingException.cs
- Label.cs
- ToolstripProfessionalRenderer.cs
- DiscoveryServerProtocol.cs
- EmptyEnumerator.cs
- CreateUserWizardStep.cs
- ReadOnlyDictionary.cs
- ManipulationVelocities.cs
- Vector3D.cs
- DataGridCellClipboardEventArgs.cs
- HandlerBase.cs
- FormViewPageEventArgs.cs
- WindowInteractionStateTracker.cs
- TextLineResult.cs
- Form.cs
- NativeMethods.cs
- SecurityTokenContainer.cs
- GeneratedCodeAttribute.cs
- ObjectDataProvider.cs
- UnhandledExceptionEventArgs.cs
- DataStorage.cs
- Boolean.cs
- OciEnlistContext.cs
- NamespaceExpr.cs
- KeyGestureValueSerializer.cs
- RuleInfoComparer.cs
- XmlStreamStore.cs
- RayMeshGeometry3DHitTestResult.cs
- DependencyPropertyHelper.cs
- InfoCardRSAPKCS1KeyExchangeDeformatter.cs
- WebColorConverter.cs
- DataGridViewComboBoxCell.cs
- ServiceThrottlingElement.cs
- SpeechSynthesizer.cs
- GroupItemAutomationPeer.cs
- BehaviorEditorPart.cs
- DetailsViewInsertEventArgs.cs
- UserMapPath.cs
- TemplatePagerField.cs
- FullTrustAssembliesSection.cs
- PropertyManager.cs
- StringUtil.cs
- CommandHelpers.cs
- _AutoWebProxyScriptEngine.cs
- NavigationPropertySingletonExpression.cs
- SqlAggregateChecker.cs
- CommandBinding.cs
- DbQueryCommandTree.cs
- IPCCacheManager.cs
- XmlCDATASection.cs
- SingleAnimation.cs
- WebSysDisplayNameAttribute.cs
- EmptyElement.cs
- EntityDataSourceEntitySetNameItem.cs
- StringArrayConverter.cs
- nulltextcontainer.cs
- BmpBitmapEncoder.cs
- CommandLibraryHelper.cs
- Brushes.cs
- AdRotator.cs
- ScriptReferenceEventArgs.cs