Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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. // //----------------------------------------------------------------------------- /* */ 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
- XPathNodeList.cs
- WindowsListView.cs
- CodeRemoveEventStatement.cs
- AtlasWeb.Designer.cs
- _ConnectionGroup.cs
- ExclusiveCanonicalizationTransform.cs
- SEHException.cs
- DictionaryItemsCollection.cs
- NoneExcludedImageIndexConverter.cs
- FreezableOperations.cs
- CodeGotoStatement.cs
- ValueTypeFixupInfo.cs
- EdmItemCollection.cs
- DataControlFieldCell.cs
- ProfileGroupSettings.cs
- DocumentApplicationState.cs
- CollectionViewGroupRoot.cs
- TransactedReceiveData.cs
- Asn1IntegerConverter.cs
- WorkflowViewStateService.cs
- OfTypeExpression.cs
- DictionaryBase.cs
- RenderOptions.cs
- TextServicesHost.cs
- ExtenderProvidedPropertyAttribute.cs
- Solver.cs
- BinaryParser.cs
- XmlDataLoader.cs
- XmlSchemaGroupRef.cs
- TriState.cs
- FixedSOMPage.cs
- BaseDataBoundControl.cs
- SmiMetaDataProperty.cs
- WebPartMinimizeVerb.cs
- Char.cs
- PointCollectionValueSerializer.cs
- Separator.cs
- X509ChainPolicy.cs
- PageAsyncTaskManager.cs
- ItemsPresenter.cs
- ClientUtils.cs
- Odbc32.cs
- Win32NamedPipes.cs
- ListViewGroupItemCollection.cs
- DetailsViewUpdatedEventArgs.cs
- Stylesheet.cs
- DataTableMappingCollection.cs
- StaticSiteMapProvider.cs
- SqlFlattener.cs
- ResXResourceWriter.cs
- ImageAnimator.cs
- XPathDocumentNavigator.cs
- UpdateManifestForBrowserApplication.cs
- URLAttribute.cs
- Maps.cs
- AttributeData.cs
- ProjectionPath.cs
- StringFormat.cs
- DataGridColumn.cs
- TraceContextEventArgs.cs
- EntityChangedParams.cs
- NavigationWindow.cs
- Model3DCollection.cs
- GridViewColumn.cs
- GetLastErrorDetailsRequest.cs
- Operators.cs
- MediaPlayerState.cs
- RemotingAttributes.cs
- ISAPIRuntime.cs
- KoreanCalendar.cs
- ColumnTypeConverter.cs
- SingleResultAttribute.cs
- KeyFrames.cs
- TextTreeFixupNode.cs
- BindingCompleteEventArgs.cs
- ValidationErrorEventArgs.cs
- SimpleFieldTemplateUserControl.cs
- InfiniteIntConverter.cs
- MostlySingletonList.cs
- DeleteHelper.cs
- GridViewHeaderRowPresenter.cs
- MaskedTextBoxTextEditorDropDown.cs
- CodeParameterDeclarationExpressionCollection.cs
- FileVersionInfo.cs
- RelationshipEndCollection.cs
- SafeFileMapViewHandle.cs
- ObjectParameterCollection.cs
- CustomSignedXml.cs
- WpfPayload.cs
- ObjectDataSourceStatusEventArgs.cs
- ListViewTableRow.cs
- TreeViewImageKeyConverter.cs
- NavigationWindow.cs
- Helpers.cs
- PersistenceParticipant.cs
- TemplatedMailWebEventProvider.cs
- DataGridViewComboBoxEditingControl.cs
- ConfigurationValidatorAttribute.cs
- EventLogTraceListener.cs
- ReaderWriterLockWrapper.cs