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

   1 //------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //------------------------------------------------------------
   4
   5 namespace System.Activities.Core.Presentation
   6 {
   7     using System.Linq;
   8     using System.Runtime;
   9     using System.Windows;
  10     using System.Windows.Controls;
  11     using System.Windows.Input;
  12     using System.Activities.Presentation;
  13     using System.Activities.Presentation.View;
  14     using System.Activities.Presentation.Model;
  15
  16     partial class StartSymbol
  17     {
  18
  19         public static readonly DependencyProperty TextProperty =
  20             DependencyProperty.Register("Text", typeof(string), typeof(StartSymbol));
  21
  22         public string Text
  23         {
  24             get { return (string)GetValue(TextProperty); }
  25             set { SetValue(TextProperty, value); }
  26         }
  27
  28         public static StartSymbol CreateStartSymbol(EditingContext context)
  29         {
  30             StartSymbol start = new StartSymbol();
  31             FakeRoot fakeRoot = new FakeRoot { StartNode = new StartNode() };
  32             ModelTreeManager manager = context.Services.GetService<ModelTreeManager>();
  33             start.ModelItem = new FakeModelItemImpl(manager, typeof(FakeRoot), fakeRoot, null).Properties["StartNode"].Value;
  34             start.Name = "StartSymbol";
  35             start.Focusable = true;
  36             start.Context = context;
  37             start.DataContext = start;
  38             return start;
  39         }
  40
  41         StartSymbol()
  42         {
  43             InitializeComponent();
  44         }
  45
  46         protected override void OnContextMenuOpening(ContextMenuEventArgs e)
  47         {
  48             e.Handled = true;
  49         }
  50
  51         protected override void OnPreviewKeyDown(KeyEventArgs e)
  52         {
  53             if (e.Key == Key.Delete)
  54             {
  55                 Selection selection = this.Context.Items.GetValue<Selection>();
  56
  57                 if (selection.SelectionCount == 1)
  58                 {
  59                     Fx.Assert(selection.PrimarySelection.Parent.ItemType == typeof(FakeRoot), "StartNode should have a fakeroot.");
  60                     // Avoid calling the delete command, if only the start node is selected.
  61                     e.Handled = true;
  62                 }
  63             }
  64
  65             base.OnPreviewKeyDown(e);
  66         }
  67     }
  68
  69
  70 }