mcs/class/referencesource/System.Activities.Core.Presentation/System/Activities/Core/Presentation/ParallelSeparator.xaml.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Core.Presentation
   6 {
   7     using System.Activities.Presentation;
   8     using System.Activities.Presentation.Hosting;
   9     using System.Windows;
  10     using System.Windows.Automation;
  11     using System.Windows.Media.Animation;
  12
  13     partial class ParallelSeparator
  14     {
  15         public static readonly DependencyProperty AllowedItemTypeProperty =
  16             DependencyProperty.Register("AllowedItemType", typeof(Type), typeof(ParallelSeparator), new UIPropertyMetadata(typeof(object)));
  17
  18         public static readonly DependencyProperty ContextProperty = DependencyProperty.Register(
  19             "Context",
  20             typeof(EditingContext),
  21             typeof(ParallelSeparator));
  22
  23         public ParallelSeparator()
  24         {
  25             this.InitializeComponent();
  26             if (!LocalAppContextSwitches.UseLegacyAccessibilityFeatures)
  27             {
  28                 SetValue(AutomationProperties.NameProperty, SR.ParallelSeparatorAutomationName);
  29             }
  30         }
  31
  32         public Type AllowedItemType
  33         {
  34             get { return (Type)GetValue(AllowedItemTypeProperty); }
  35             set { SetValue(AllowedItemTypeProperty, value); }
  36         }
  37
  38         public EditingContext Context
  39         {
  40             get { return (EditingContext)GetValue(ContextProperty); }
  41             set { SetValue(ContextProperty, value); }
  42         }
  43
  44         protected override void OnDragEnter(DragEventArgs e)
  45         {
  46             CheckAnimate(e, "Expand");
  47             this.dropTarget.Visibility = Visibility.Visible;
  48         }
  49
  50         protected override void OnDragLeave(DragEventArgs e)
  51         {
  52             CheckAnimate(e, "Collapse");
  53             this.dropTarget.Visibility = Visibility.Collapsed;
  54         }
  55
  56         protected override void OnDrop(DragEventArgs e)
  57         {
  58             this.dropTarget.Visibility = Visibility.Collapsed;
  59             base.OnDrop(e);
  60         }
  61
  62         void CheckAnimate(DragEventArgs e, string storyboardResourceName)
  63         {
  64             if (!e.Handled)
  65             {
  66                 if (!this.Context.Items.GetValue<ReadOnlyState>().IsReadOnly &&
  67                     DragDropHelper.AllowDrop(e.Data, this.Context, this.AllowedItemType))
  68                 {
  69                     BeginStoryboard((Storyboard)this.Resources[storyboardResourceName]);
  70                     return;
  71                 }
  72                 else
  73                 {
  74                     e.Effects = DragDropEffects.None;
  75                 }
  76                 e.Handled = true;
  77             }
  78         }
  79     }
  80 }