Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / System / Windows / Controls / MenuScrollingVisibilityConverter.cs / 1 / MenuScrollingVisibilityConverter.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Used to show or hide arrow buttons in scrolling menus. // //--------------------------------------------------------------------------- using System; using System.Globalization; using System.Windows; using System.Windows.Automation.Provider; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Data; using System.Windows.Media; using MS.Internal; namespace System.Windows.Controls { ////// Data binding converter to handle the visibility of repeat buttons in scrolling menus. /// public sealed class MenuScrollingVisibilityConverter : IMultiValueConverter { ////// Convert a value. Called when moving a value from source to target. /// /// values as produced by source binding /// target type /// converter parameter /// culture information ////// Converted value. /// /// System.Windows.DependencyProperty.UnsetValue may be returned to indicate that /// the converter produced no value and that the fallback (if available) /// or default value should be used instead. /// /// Binding.DoNothing may be returned to indicate that the binding /// should not transfer the value or use the fallback or default value. /// public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { // // Parameter Validation // Type doubleType = typeof(double); if (parameter == null || values == null || values.Length != 4 || values[0] == null || values[1] == null || values[2] == null || values[3] == null || !typeof(Visibility).IsAssignableFrom(values[0].GetType()) || !doubleType.IsAssignableFrom(values[1].GetType()) || !doubleType.IsAssignableFrom(values[2].GetType()) || !doubleType.IsAssignableFrom(values[3].GetType()) ) { return DependencyProperty.UnsetValue; } Type paramType = parameter.GetType(); if (!(doubleType.IsAssignableFrom(paramType) || typeof(string).IsAssignableFrom(paramType))) { return DependencyProperty.UnsetValue; } // // Conversion // // If the scroll bar should be visible, then so should our buttons Visibility computedVerticalScrollBarVisibility = (Visibility)values[0]; if (computedVerticalScrollBarVisibility == Visibility.Visible) { double target; if (parameter is string) { target = Double.Parse(((string)parameter), NumberFormatInfo.InvariantInfo); } else { target = (double)parameter; } double verticalOffset = (double)values[1]; double extentHeight = (double)values[2]; double viewportHeight = (double)values[3]; if (extentHeight != viewportHeight) // Avoid divide by 0 { // Calculate the percent so that we can see if we are near the edge of the range double percent = Math.Min(100.0, Math.Max(0.0, (verticalOffset * 100.0 / (extentHeight - viewportHeight)))); if (DoubleUtil.AreClose(percent, target)) { // We are at the end of the range, so no need for this button to be shown return Visibility.Collapsed; } } return Visibility.Visible; } return Visibility.Collapsed; } ////// Not Supported /// /// value, as produced by target /// target types /// converter parameter /// culture information ///Nothing public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { return new object[] { Binding.DoNothing }; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Used to show or hide arrow buttons in scrolling menus. // //--------------------------------------------------------------------------- using System; using System.Globalization; using System.Windows; using System.Windows.Automation.Provider; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Data; using System.Windows.Media; using MS.Internal; namespace System.Windows.Controls { ////// Data binding converter to handle the visibility of repeat buttons in scrolling menus. /// public sealed class MenuScrollingVisibilityConverter : IMultiValueConverter { ////// Convert a value. Called when moving a value from source to target. /// /// values as produced by source binding /// target type /// converter parameter /// culture information ////// Converted value. /// /// System.Windows.DependencyProperty.UnsetValue may be returned to indicate that /// the converter produced no value and that the fallback (if available) /// or default value should be used instead. /// /// Binding.DoNothing may be returned to indicate that the binding /// should not transfer the value or use the fallback or default value. /// public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { // // Parameter Validation // Type doubleType = typeof(double); if (parameter == null || values == null || values.Length != 4 || values[0] == null || values[1] == null || values[2] == null || values[3] == null || !typeof(Visibility).IsAssignableFrom(values[0].GetType()) || !doubleType.IsAssignableFrom(values[1].GetType()) || !doubleType.IsAssignableFrom(values[2].GetType()) || !doubleType.IsAssignableFrom(values[3].GetType()) ) { return DependencyProperty.UnsetValue; } Type paramType = parameter.GetType(); if (!(doubleType.IsAssignableFrom(paramType) || typeof(string).IsAssignableFrom(paramType))) { return DependencyProperty.UnsetValue; } // // Conversion // // If the scroll bar should be visible, then so should our buttons Visibility computedVerticalScrollBarVisibility = (Visibility)values[0]; if (computedVerticalScrollBarVisibility == Visibility.Visible) { double target; if (parameter is string) { target = Double.Parse(((string)parameter), NumberFormatInfo.InvariantInfo); } else { target = (double)parameter; } double verticalOffset = (double)values[1]; double extentHeight = (double)values[2]; double viewportHeight = (double)values[3]; if (extentHeight != viewportHeight) // Avoid divide by 0 { // Calculate the percent so that we can see if we are near the edge of the range double percent = Math.Min(100.0, Math.Max(0.0, (verticalOffset * 100.0 / (extentHeight - viewportHeight)))); if (DoubleUtil.AreClose(percent, target)) { // We are at the end of the range, so no need for this button to be shown return Visibility.Collapsed; } } return Visibility.Visible; } return Visibility.Collapsed; } ////// Not Supported /// /// value, as produced by target /// target types /// converter parameter /// culture information ///Nothing public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { return new object[] { Binding.DoNothing }; } } } // 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
- CodeDirectiveCollection.cs
- DataStreamFromComStream.cs
- ExpandedProjectionNode.cs
- CompressedStack.cs
- ZipArchive.cs
- ResolveNameEventArgs.cs
- SortKey.cs
- CommonRemoteMemoryBlock.cs
- KeyConstraint.cs
- Animatable.cs
- XmlWrappingWriter.cs
- ToolBarButtonDesigner.cs
- ClientTargetSection.cs
- MimeTypeMapper.cs
- UIElementIsland.cs
- GeneralTransform3DGroup.cs
- TraceLog.cs
- TreeNodeConverter.cs
- TreeView.cs
- EntityClientCacheKey.cs
- Rotation3D.cs
- InkPresenter.cs
- LogicalExpr.cs
- Mapping.cs
- ThreadBehavior.cs
- SchemaNamespaceManager.cs
- ListViewGroupItemCollection.cs
- CaretElement.cs
- ServiceProviders.cs
- WindowsListViewGroup.cs
- MaskedTextProvider.cs
- DataRow.cs
- Focus.cs
- Span.cs
- ExpressionPrinter.cs
- GetPageCompletedEventArgs.cs
- ConnectionManagementElement.cs
- DataGridViewElement.cs
- XamlFigureLengthSerializer.cs
- SingleResultAttribute.cs
- UIPropertyMetadata.cs
- PreviewPrintController.cs
- StrokeFIndices.cs
- UpdateRecord.cs
- TraceProvider.cs
- XPathParser.cs
- Application.cs
- XmlDomTextWriter.cs
- KernelTypeValidation.cs
- WSSecurityOneDotOneSendSecurityHeader.cs
- KnownTypes.cs
- thaishape.cs
- Base64Decoder.cs
- ImageAttributes.cs
- ContractComponent.cs
- ProcessDesigner.cs
- MembershipValidatePasswordEventArgs.cs
- TemplateControlCodeDomTreeGenerator.cs
- SecurityToken.cs
- OrderedDictionary.cs
- PeerToPeerException.cs
- AmbientValueAttribute.cs
- UriScheme.cs
- DynamicDataRouteHandler.cs
- objectresult_tresulttype.cs
- EventSinkActivityDesigner.cs
- FontClient.cs
- EventProviderWriter.cs
- ListViewInsertEventArgs.cs
- ButtonChrome.cs
- DoubleConverter.cs
- MemberDescriptor.cs
- ObjectConverter.cs
- PageThemeCodeDomTreeGenerator.cs
- UDPClient.cs
- PatternMatcher.cs
- AsymmetricKeyExchangeFormatter.cs
- EventLogPermissionEntryCollection.cs
- OdbcHandle.cs
- SqlDataSourceWizardForm.cs
- BooleanExpr.cs
- regiisutil.cs
- _SingleItemRequestCache.cs
- BooleanFunctions.cs
- ReadOnlyMetadataCollection.cs
- ToolBarPanel.cs
- DesignConnection.cs
- GridViewRowPresenterBase.cs
- keycontainerpermission.cs
- storagemappingitemcollection.viewdictionary.cs
- TextModifierScope.cs
- XmlReflectionMember.cs
- RtfToXamlReader.cs
- SqlOuterApplyReducer.cs
- SiteIdentityPermission.cs
- Deflater.cs
- EntityObject.cs
- WorkflowDefinitionContext.cs
- PathGeometry.cs
- GridViewRowCollection.cs