mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Toolbox/ToolboxItemImageConverter.cs

   1 //------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Toolbox
   6 {
   7     using System;
   8     using System.Drawing;
   9     using System.Globalization;
  10     using System.Windows;
  11     using System.Windows.Data;
  12     using System.Windows.Interop;
  13     using System.Windows.Media;
  14     using System.Windows.Media.Imaging;
  15     using Microsoft.Tools.Common;
  16
  17     //This class is responsible for converting 'old' bitmap style, contained
  18     //in ToolboxItem objects to WPF compatible ImageSource object
  19
  20     [ValueConversion(typeof(Bitmap), typeof(ImageSource))]
  21     sealed class ToolboxItemImageConverter : IValueConverter
  22     {
  23         object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
  24         {
  25             Bitmap source = value as Bitmap;
  26             if (targetType == typeof(ImageSource) && null != source)
  27             {
  28                 IntPtr hBitmap = source.GetHbitmap();
  29                 try
  30                 {
  31                     BitmapSizeOptions sizeOptions = BitmapSizeOptions.FromEmptyOptions();
  32                     return Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, sizeOptions);
  33                 }
  34                 finally
  35                 {
  36                     Win32Interop.DeleteObject(hBitmap);
  37                 }
  38             }
  39             return null;
  40         }
  41
  42         object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  43         {
  44             throw FxTrace.Exception.AsError(new NotSupportedException());
  45         }
  46     }
  47 }