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
- ElementHost.cs
- X509SecurityTokenProvider.cs
- AttributedMetaModel.cs
- EmptyQuery.cs
- PerCallInstanceContextProvider.cs
- LostFocusEventManager.cs
- AccessDataSourceView.cs
- DesignerExtenders.cs
- SingleKeyFrameCollection.cs
- TableLayoutSettingsTypeConverter.cs
- DefaultWorkflowTransactionService.cs
- StateManagedCollection.cs
- XPathAncestorIterator.cs
- RetrieveVirtualItemEventArgs.cs
- ToolStripOverflow.cs
- NativeMethods.cs
- AssemblySettingAttributes.cs
- DecoderFallbackWithFailureFlag.cs
- DropTarget.cs
- ToolStripManager.cs
- WebPartCollection.cs
- FillBehavior.cs
- LocatorPartList.cs
- ExpressionVisitorHelpers.cs
- X509Utils.cs
- ProcessInfo.cs
- SvcMapFileSerializer.cs
- Shape.cs
- HtmlShimManager.cs
- XmlQualifiedName.cs
- EditorPartChrome.cs
- Int32EqualityComparer.cs
- DataGridItem.cs
- SqlCachedBuffer.cs
- TypefaceMetricsCache.cs
- ClientTargetCollection.cs
- NativeMethodsCLR.cs
- HttpCapabilitiesBase.cs
- RequiredFieldValidator.cs
- ExpressionEvaluator.cs
- RuleSetDialog.Designer.cs
- SoapSchemaExporter.cs
- TextTreeRootNode.cs
- RadioButtonRenderer.cs
- SharedUtils.cs
- ConsoleKeyInfo.cs
- RichTextBox.cs
- Privilege.cs
- OleDbRowUpdatingEvent.cs
- TagPrefixInfo.cs
- PersonalizationProviderHelper.cs
- BitmapEffectInputData.cs
- ArgumentValidation.cs
- TrimSurroundingWhitespaceAttribute.cs
- CachingHintValidation.cs
- TransformerConfigurationWizardBase.cs
- DataSourceView.cs
- ValueProviderWrapper.cs
- WebRequestModuleElementCollection.cs
- DataServiceQueryOfT.cs
- SHA256Managed.cs
- WrapPanel.cs
- RolePrincipal.cs
- TextTreeNode.cs
- ParamArrayAttribute.cs
- SystemSounds.cs
- Ipv6Element.cs
- SplineQuaternionKeyFrame.cs
- CreateUserWizardDesigner.cs
- MailWebEventProvider.cs
- EntityDataSourceContextDisposingEventArgs.cs
- AnnotationAdorner.cs
- Inline.cs
- RubberbandSelector.cs
- SharedDp.cs
- CheckBoxBaseAdapter.cs
- ZipIOZip64EndOfCentralDirectoryLocatorBlock.cs
- WindowsListViewItem.cs
- EditorPartChrome.cs
- DeliveryStrategy.cs
- ProcessHost.cs
- PropertyChangedEventArgs.cs
- SqlDataReader.cs
- CatalogZoneBase.cs
- MetadataSource.cs
- DiscoveryService.cs
- nulltextcontainer.cs
- EntityWrapper.cs
- UnsafeNativeMethods.cs
- WindowsTooltip.cs
- RegexRunner.cs
- FixedFindEngine.cs
- PolyBezierSegment.cs
- ResourceContainer.cs
- NetTcpSectionData.cs
- XmlAnyElementAttributes.cs
- SamlAuthenticationClaimResource.cs
- ExternalFile.cs
- RightsManagementInformation.cs
- WindowsListViewItemStartMenu.cs