Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / OpacityConverter.cs / 1 / 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. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- GroupStyle.cs
- RoutingExtension.cs
- ApplicationDirectory.cs
- TextTreeRootNode.cs
- CompositionDesigner.cs
- FontWeight.cs
- StylusDevice.cs
- CriticalExceptions.cs
- Span.cs
- TextFindEngine.cs
- securestring.cs
- VariableAction.cs
- WmlFormAdapter.cs
- _LoggingObject.cs
- SortExpressionBuilder.cs
- HttpPostedFile.cs
- InputMethodStateTypeInfo.cs
- InfoCardRSAPKCS1SignatureFormatter.cs
- DataContractSerializerElement.cs
- TraceLog.cs
- TemplateKey.cs
- ContentTextAutomationPeer.cs
- oledbconnectionstring.cs
- GraphicsPathIterator.cs
- MarkupObject.cs
- HeaderPanel.cs
- ToolStripPanel.cs
- XmlNamedNodeMap.cs
- SecurityState.cs
- InternalSafeNativeMethods.cs
- ContentElement.cs
- TableParaClient.cs
- PropertyGridCommands.cs
- Activator.cs
- IItemProperties.cs
- PropertyMapper.cs
- ServiceSecurityContext.cs
- PersonalizationEntry.cs
- RealizationContext.cs
- MultiByteCodec.cs
- RTTrackingProfile.cs
- BorderGapMaskConverter.cs
- FlowDocumentReader.cs
- Region.cs
- NativeWrapper.cs
- UnmanagedMemoryStream.cs
- NameScope.cs
- ArraySortHelper.cs
- ValidatingReaderNodeData.cs
- VerifyHashRequest.cs
- AnnotationResource.cs
- controlskin.cs
- TextTabProperties.cs
- NominalTypeEliminator.cs
- LocalTransaction.cs
- GridViewDeletedEventArgs.cs
- ToolStripLabel.cs
- FormViewInsertEventArgs.cs
- RsaSecurityTokenParameters.cs
- NGCSerializationManager.cs
- SystemIPGlobalStatistics.cs
- Wow64ConfigurationLoader.cs
- SafeUserTokenHandle.cs
- FileChangesMonitor.cs
- NavigationExpr.cs
- EnumMember.cs
- ClientCultureInfo.cs
- DrawingGroup.cs
- Helpers.cs
- Rect.cs
- SqlBuffer.cs
- MessageQueueException.cs
- BCLDebug.cs
- DBCSCodePageEncoding.cs
- AsyncContentLoadedEventArgs.cs
- HtmlAnchor.cs
- ScrollBar.cs
- TemplateFactory.cs
- XsltConvert.cs
- InputBindingCollection.cs
- LayoutEngine.cs
- FullTextState.cs
- ScalarConstant.cs
- FlagsAttribute.cs
- TextEditorTyping.cs
- ToolboxItemLoader.cs
- SchemaDeclBase.cs
- UidPropertyAttribute.cs
- LicenseContext.cs
- ColorConverter.cs
- ExtensionFile.cs
- ListSortDescription.cs
- FlagsAttribute.cs
- IdentityModelStringsVersion1.cs
- DataObjectFieldAttribute.cs
- Misc.cs
- HandlerMappingMemo.cs
- ModelItemCollectionImpl.cs
- FixedHyperLink.cs
- GeneralTransform2DTo3DTo2D.cs