Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WinCategoryAttribute.cs
- ClientApiGenerator.cs
- SiteMapHierarchicalDataSourceView.cs
- DefaultValidator.cs
- MemoryMappedFileSecurity.cs
- HashStream.cs
- DocumentApplicationDocumentViewer.cs
- TdsRecordBufferSetter.cs
- Exceptions.cs
- SafeNativeMethods.cs
- StrokeNodeEnumerator.cs
- AssemblyBuilderData.cs
- ModelFunction.cs
- ToolTipService.cs
- XmlReflectionMember.cs
- MobilePage.cs
- BitmapCodecInfoInternal.cs
- KeyValueConfigurationCollection.cs
- cookieexception.cs
- NonVisualControlAttribute.cs
- Connector.xaml.cs
- XPathItem.cs
- TrackingCondition.cs
- messageonlyhwndwrapper.cs
- ImageListUtils.cs
- NavigationPropertyAccessor.cs
- StateMachineSubscription.cs
- SchemaSetCompiler.cs
- DataGridViewAccessibleObject.cs
- CommonRemoteMemoryBlock.cs
- DataListItem.cs
- UInt32Converter.cs
- FixedDSBuilder.cs
- shaperfactory.cs
- BamlWriter.cs
- EndPoint.cs
- TraceListener.cs
- TraceUtils.cs
- SystemIcmpV6Statistics.cs
- MsmqIntegrationElement.cs
- _SSPIWrapper.cs
- SmiEventSink_DeferedProcessing.cs
- Control.cs
- LayoutUtils.cs
- ReflectionPermission.cs
- Popup.cs
- CollectionBuilder.cs
- ColumnHeaderConverter.cs
- SpeechSynthesizer.cs
- DataGridViewTextBoxCell.cs
- XmlCharType.cs
- XsltCompileContext.cs
- MarkerProperties.cs
- KeyboardDevice.cs
- Helper.cs
- BufferedReadStream.cs
- TraceContextRecord.cs
- ScriptResourceDefinition.cs
- ObjectStateFormatter.cs
- PseudoWebRequest.cs
- ExpressionBindingCollection.cs
- Config.cs
- TextBoxDesigner.cs
- Scene3D.cs
- AspCompat.cs
- SafeCryptoHandles.cs
- MSAAWinEventWrap.cs
- DifferencingCollection.cs
- StrongNameUtility.cs
- DataGridCommandEventArgs.cs
- Volatile.cs
- InvalidAsynchronousStateException.cs
- MimeObjectFactory.cs
- Utils.cs
- InstanceData.cs
- Variable.cs
- ItemList.cs
- SpanIndex.cs
- CommentAction.cs
- ClientScriptItemCollection.cs
- CompensationDesigner.cs
- MemoryMappedViewStream.cs
- ObfuscateAssemblyAttribute.cs
- WindowsRichEditRange.cs
- ScrollProviderWrapper.cs
- QilList.cs
- AutoFocusStyle.xaml.cs
- PointAnimation.cs
- GeneralTransform.cs
- SqlDependencyListener.cs
- SHA256.cs
- DoubleLink.cs
- SecurityTokenInclusionMode.cs
- OneOfElement.cs
- SecurityContextTokenCache.cs
- InputBinding.cs
- MessageFormatterConverter.cs
- Hex.cs
- KoreanCalendar.cs
- OrderedDictionary.cs