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
- PatternMatchRules.cs
- ManagedIStream.cs
- ConstantProjectedSlot.cs
- ArrayElementGridEntry.cs
- JoinQueryOperator.cs
- NullReferenceException.cs
- PathFigure.cs
- DisplayInformation.cs
- EndPoint.cs
- JobPageOrder.cs
- ExtendedProtectionPolicyTypeConverter.cs
- ViewKeyConstraint.cs
- ProxyHelper.cs
- DataServiceQuery.cs
- ImportOptions.cs
- ExtendedPropertyCollection.cs
- BitmapEncoder.cs
- Preprocessor.cs
- HtmlTable.cs
- ObjectDataSourceView.cs
- ObjectStorage.cs
- Registry.cs
- ImageConverter.cs
- WhitespaceRule.cs
- ZoneMembershipCondition.cs
- StateMachineHelpers.cs
- TreeView.cs
- MonthChangedEventArgs.cs
- CachedCompositeFamily.cs
- SoapRpcServiceAttribute.cs
- FormViewUpdateEventArgs.cs
- HtmlProps.cs
- ThicknessConverter.cs
- RefType.cs
- ThrowHelper.cs
- ScriptReferenceBase.cs
- SecurityTokenParameters.cs
- UnsafeNetInfoNativeMethods.cs
- ShapingEngine.cs
- X509SubjectKeyIdentifierClause.cs
- Control.cs
- recordstatefactory.cs
- VirtualizingStackPanel.cs
- BindUriHelper.cs
- HwndSourceKeyboardInputSite.cs
- XsdDataContractImporter.cs
- AttributeData.cs
- ListBox.cs
- Geometry3D.cs
- XmlCustomFormatter.cs
- DataPager.cs
- MappingMetadataHelper.cs
- X509Chain.cs
- RadioButton.cs
- DbExpressionRules.cs
- OuterGlowBitmapEffect.cs
- TextInfo.cs
- IntranetCredentialPolicy.cs
- MILUtilities.cs
- Site.cs
- DbDataAdapter.cs
- WebPartEditorApplyVerb.cs
- TemplateControlParser.cs
- BitmapCache.cs
- SemanticResultKey.cs
- EditorZone.cs
- BackgroundWorker.cs
- AppliedDeviceFiltersDialog.cs
- FilteredReadOnlyMetadataCollection.cs
- SiteOfOriginPart.cs
- XmlSortKey.cs
- CalendarButtonAutomationPeer.cs
- Assert.cs
- _NegoState.cs
- ConfigurationManagerHelperFactory.cs
- BoundColumn.cs
- EditBehavior.cs
- FindResponse.cs
- ResXBuildProvider.cs
- SqlDataSource.cs
- MetabaseReader.cs
- BuildManager.cs
- Section.cs
- UrlAuthorizationModule.cs
- XmlCharCheckingWriter.cs
- HttpCachePolicy.cs
- SafeViewOfFileHandle.cs
- CodeGotoStatement.cs
- WebPartConnectionsConnectVerb.cs
- CustomValidator.cs
- PriorityBinding.cs
- SequentialOutput.cs
- SlotInfo.cs
- SQLRoleProvider.cs
- ObjectQueryProvider.cs
- EventData.cs
- RawTextInputReport.cs
- TextDecorationUnitValidation.cs
- DescendantOverDescendantQuery.cs
- InputChannelAcceptor.cs