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.
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