Code:
/ DotNET / DotNET / 8.0 / 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
- PasswordDeriveBytes.cs
- HtmlValidatorAdapter.cs
- DPTypeDescriptorContext.cs
- SqlTrackingQuery.cs
- EntitySetRetriever.cs
- PointAnimationClockResource.cs
- UserControl.cs
- TagNameToTypeMapper.cs
- LogicalCallContext.cs
- DataExpression.cs
- MarkupExtensionReturnTypeAttribute.cs
- Keyboard.cs
- ScriptServiceAttribute.cs
- ColorDialog.cs
- Logging.cs
- TreeSet.cs
- QueryExpr.cs
- AppDomainUnloadedException.cs
- AxisAngleRotation3D.cs
- BCryptHashAlgorithm.cs
- WindowShowOrOpenTracker.cs
- MethodBuilderInstantiation.cs
- SurrogateChar.cs
- TypeDescriptionProviderAttribute.cs
- EditCommandColumn.cs
- SplitContainer.cs
- HealthMonitoringSectionHelper.cs
- ReadWriteSpinLock.cs
- BoolLiteral.cs
- ZipIOLocalFileDataDescriptor.cs
- SqlMetaData.cs
- xmlglyphRunInfo.cs
- OdbcStatementHandle.cs
- TemplateControlBuildProvider.cs
- ToolStripRendererSwitcher.cs
- ComplexPropertyEntry.cs
- BinHexEncoding.cs
- X509Utils.cs
- InkCanvasSelectionAdorner.cs
- SizeChangedInfo.cs
- GraphicsPath.cs
- SignatureDescription.cs
- MimeTypeAttribute.cs
- DispatcherExceptionEventArgs.cs
- DocumentPageHost.cs
- RSAOAEPKeyExchangeFormatter.cs
- SoapHeaderException.cs
- InputEventArgs.cs
- PermissionSet.cs
- WebPartsPersonalization.cs
- ColumnResizeAdorner.cs
- ProviderUtil.cs
- OperationCanceledException.cs
- MediaContext.cs
- DataServiceSaveChangesEventArgs.cs
- TableItemStyle.cs
- EntityFunctions.cs
- WebReferenceOptions.cs
- GroupBoxRenderer.cs
- DateTimeEditor.cs
- IODescriptionAttribute.cs
- ScaleTransform.cs
- HttpCapabilitiesBase.cs
- SeverityFilter.cs
- ThreadStaticAttribute.cs
- Symbol.cs
- DecoderReplacementFallback.cs
- StorageComplexTypeMapping.cs
- ProxyElement.cs
- MenuItemAutomationPeer.cs
- BitmapCodecInfoInternal.cs
- ReflectTypeDescriptionProvider.cs
- InvalidDataException.cs
- ProtocolElementCollection.cs
- Focus.cs
- InvalidOperationException.cs
- PointAnimationBase.cs
- InternalCache.cs
- UriScheme.cs
- JournalEntry.cs
- X509Certificate2Collection.cs
- ProxyWebPart.cs
- TimerElapsedEvenArgs.cs
- ListViewItem.cs
- InheritedPropertyChangedEventArgs.cs
- TextEditorSpelling.cs
- IntSecurity.cs
- ColumnCollection.cs
- ZipIOLocalFileHeader.cs
- XPathNavigatorKeyComparer.cs
- ZipIOExtraFieldPaddingElement.cs
- ControllableStoryboardAction.cs
- Membership.cs
- StreamingContext.cs
- ServicesUtilities.cs
- ShapingWorkspace.cs
- DateTimeOffsetStorage.cs
- MarkedHighlightComponent.cs
- GenericRootAutomationPeer.cs
- UnwrappedTypesXmlSerializerManager.cs