Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / OpacityConverter.cs / 1305376 / OpacityConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Runtime.Serialization.Formatters; using System.Runtime.Remoting; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Reflection; ////// /// OpacityConverter is a class that can be used to convert /// opacity values from one data type to another. Access this /// class through the TypeDescriptor. /// public class OpacityConverter : TypeConverter { ////// /// 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)) { return true; } return base.CanConvertFrom(context, sourceType); } ////// /// 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).Replace('%', ' ').Trim(); double val = Double.Parse(text, CultureInfo.CurrentCulture); int indexOfPercent = ((string)value).IndexOf("%"); if (indexOfPercent > 0 && (val >= 0.0 && val <= 1.0)) { val /= 100.0; text = val.ToString(CultureInfo.CurrentCulture); } double percent = 1.0; try { percent = (double)TypeDescriptor.GetConverter(typeof(double)).ConvertFrom(context, culture, text); // assume they meant a percentage if it is > 1.0, else // they actually typed the correct double... // if (percent > 1.0) { percent /= 100.0; } } catch (FormatException e) { throw new FormatException(SR.GetString(SR.InvalidBoundArgument, "Opacity", text, "0%", "100%"), e); } // Now check to see if it is within our bounds. // if (percent < 0.0 || percent > 1.0) { throw new FormatException(SR.GetString(SR.InvalidBoundArgument, "Opacity", text, "0%", "100%")); } return percent; } 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)) { double val = (double)value; int perc = (int)(val * 100.0); return perc.ToString(CultureInfo.CurrentCulture) + "%"; } return base.ConvertTo(context, culture, value, destinationType); } } } // 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
- CqlLexer.cs
- RoleManagerModule.cs
- NullExtension.cs
- _IPv6Address.cs
- TableCellAutomationPeer.cs
- DataTableMappingCollection.cs
- UInt16Storage.cs
- AttachedPropertiesService.cs
- UIAgentMonitor.cs
- MexNamedPipeBindingElement.cs
- Message.cs
- FtpWebResponse.cs
- OleDbErrorCollection.cs
- RegexStringValidatorAttribute.cs
- Operator.cs
- MouseOverProperty.cs
- CompilerScopeManager.cs
- XmlDataSourceNodeDescriptor.cs
- Events.cs
- HttpCapabilitiesSectionHandler.cs
- PathFigureCollection.cs
- TextDocumentView.cs
- TracedNativeMethods.cs
- FileFormatException.cs
- ErrorWebPart.cs
- SplineQuaternionKeyFrame.cs
- sqlser.cs
- DrawingImage.cs
- ParagraphVisual.cs
- DoubleLink.cs
- DataGridViewCellCollection.cs
- XPathNodeList.cs
- EndpointNotFoundException.cs
- _ConnectionGroup.cs
- AttachedProperty.cs
- TreeNodeCollection.cs
- GeneralTransform3DCollection.cs
- ParameterCollection.cs
- FileSecurity.cs
- HtmlForm.cs
- HwndAppCommandInputProvider.cs
- EditorZone.cs
- TextSimpleMarkerProperties.cs
- MediaTimeline.cs
- SessionStateItemCollection.cs
- LinkLabelLinkClickedEvent.cs
- UriSectionData.cs
- BulletChrome.cs
- OutOfProcStateClientManager.cs
- XmlNotation.cs
- View.cs
- NativeMethodsOther.cs
- HttpListenerRequest.cs
- DSACryptoServiceProvider.cs
- SqlServer2KCompatibilityAnnotation.cs
- FormsAuthenticationConfiguration.cs
- ServerTooBusyException.cs
- SiteMapNodeItemEventArgs.cs
- SettingsPropertyCollection.cs
- FileUpload.cs
- XmlSchemaDocumentation.cs
- ActiveXSite.cs
- TickBar.cs
- InkCanvasFeedbackAdorner.cs
- HashHelper.cs
- SelectionProviderWrapper.cs
- AccessedThroughPropertyAttribute.cs
- IndexerNameAttribute.cs
- AuthorizationSection.cs
- SecurityPolicySection.cs
- Size3DValueSerializer.cs
- NativeStructs.cs
- streamingZipPartStream.cs
- XhtmlStyleClass.cs
- Perspective.cs
- ResourceReferenceExpressionConverter.cs
- DataGridViewButtonCell.cs
- ConfigXmlSignificantWhitespace.cs
- RectAnimation.cs
- XmlSchemaExternal.cs
- SuppressMergeCheckAttribute.cs
- Visual3D.cs
- NetTcpBinding.cs
- ZoomingMessageFilter.cs
- PackageController.cs
- HttpClientProtocol.cs
- FormsAuthenticationConfiguration.cs
- DrawingImage.cs
- WindowsMenu.cs
- CodePropertyReferenceExpression.cs
- WebSysDisplayNameAttribute.cs
- ChannelHandler.cs
- ExpandedProjectionNode.cs
- DateTimeSerializationSection.cs
- HeaderCollection.cs
- ObjectDataSourceStatusEventArgs.cs
- MimeMultiPart.cs
- TypeReference.cs
- XmlAnyElementAttributes.cs
- WebPartEditVerb.cs