mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Base/Core/Internal/PropertyEditing/Resources/ResourceUtilities.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4 namespace System.Activities.Presentation.Internal.PropertyEditing.Resources
   5 {
   6     using System;
   7     using System.Windows;
   8     using System.Activities.Presentation;
   9
  10     // <summary>
  11     // Helper utilities for accessing values in ResourceDictionaries of controls
  12     // </summary>
  13     internal static class ResourceUtilities
  14     {
  15
  16         private const string TypeIconWidthKey = "TypeIconWidth";
  17         private const string TypeIconHeightKey = "TypeIconHeight";
  18
  19         // <summary>
  20         // Looks up a double based on the specified key, returning specified fallback value if not found
  21         // </summary>
  22         // <param name="element">Element to use as the starting point</param>
  23         // <param name="key">Key to look up</param>
  24         // <param name="fallbackValue">Fallback value to return if key is not found</param>
  25         // <returns>Double from the resource or fallback value if not found</returns>
  26         public static double GetDouble(FrameworkElement element, string key, double fallbackValue)
  27         {
  28             if (element == null)
  29             {
  30                 throw FxTrace.Exception.ArgumentNull("element");
  31             }
  32             if (string.IsNullOrEmpty(key))
  33             {
  34                 throw FxTrace.Exception.ArgumentNull("key");
  35             }
  36             return (double)(element.FindResource(key) ?? fallbackValue);
  37         }
  38
  39         public static Size GetDesiredTypeIconSize(FrameworkElement queryRoot)
  40         {
  41             return new Size(ResourceUtilities.GetDouble(queryRoot, TypeIconWidthKey, 16),
  42                 ResourceUtilities.GetDouble(queryRoot, TypeIconHeightKey, 16));
  43         }
  44     }
  45 }