WorkflowMenuCommands.Enable Field
Definition
Important
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A CommandID that can be used to access the enable menu. This field is read-only.
public: static initonly System::ComponentModel::Design::CommandID ^ Enable;public static readonly System.ComponentModel.Design.CommandID Enable; staticval mutable Enable : System.ComponentModel.Design.CommandIDPublic Shared ReadOnly Enable As CommandID Field Value
Examples
The following example demonstrates how to create a custom MenuCommandService. In this example, a context menu is created when the ShowContextMenu is called. In the GetSelectionMenuItems method, the WorkflowMenuCommands class is utilized to associate the proper menu commands provided by the workflow designer with their corresponding text. When this is finished, an event handler is associated with each command so that when the command is selected, the appropriate MenuCommand is invoked.
internal sealed class WorkflowMenuCommandService : MenuCommandService
{
public WorkflowMenuCommandService(IServiceProvider serviceProvider)
: base(serviceProvider)
{
}
public override void ShowContextMenu(CommandID menuID, int x, int y)
{
if (menuID == WorkflowMenuCommands.SelectionMenu)
{
ContextMenu contextMenu = new ContextMenu();
foreach (DesignerVerb verb in Verbs)
{
MenuItem menuItem = new MenuItem(verb.Text, new EventHandler(OnMenuClicked));
menuItem.Tag = verb;
contextMenu.MenuItems.Add(menuItem);
}
MenuItem[] items = GetSelectionMenuItems();
if (items.Length > 0)
{
contextMenu.MenuItems.Add(new MenuItem("-"));
foreach (MenuItem item in items)
contextMenu.MenuItems.Add(item);
}
WorkflowView workflowView = GetService(typeof(WorkflowView)) as WorkflowView;
if (workflowView != null)
contextMenu.Show(workflowView, workflowView.PointToClient(new Point(x, y)));
}
}
private MenuItem[] GetSelectionMenuItems()
{
List<MenuItem> menuItems = new List<MenuItem>();
bool addMenuItems = true;
ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
if (selectionService != null)
{
foreach (object obj in selectionService.GetSelectedComponents())
{
if (!(obj is Activity))
{
addMenuItems = false;
break;
}
}
}
if (addMenuItems)
{
Dictionary<CommandID, string> selectionCommands = new Dictionary<CommandID, string>();
selectionCommands.Add(WorkflowMenuCommands.Cut, "Cut");
selectionCommands.Add(WorkflowMenuCommands.Copy, "Copy");
selectionCommands.Add(WorkflowMenuCommands.Paste, "Paste");
selectionCommands.Add(WorkflowMenuCommands.Delete, "Delete");
selectionCommands.Add(WorkflowMenuCommands.Collapse, "Collapse");
selectionCommands.Add(WorkflowMenuCommands.Expand, "Expand");
selectionCommands.Add(WorkflowMenuCommands.Disable, "Disable");
selectionCommands.Add(WorkflowMenuCommands.Enable, "Enable");
foreach (CommandID id in selectionCommands.Keys)
{
MenuCommand command = FindCommand(id);
if (command != null)
{
MenuItem menuItem = new MenuItem(selectionCommands[id], new EventHandler(OnMenuClicked));
menuItem.Tag = command;
menuItems.Add(menuItem);
}
}
}
return menuItems.ToArray();
}
private void OnMenuClicked(object sender, EventArgs e)
{
MenuItem menuItem = sender as MenuItem;
if (menuItem != null && menuItem.Tag is MenuCommand)
{
MenuCommand command = menuItem.Tag as MenuCommand;
command.Invoke();
}
}
}
Friend NotInheritable Class WorkflowMenuCommandService
Inherits MenuCommandService
Public Sub New(ByVal serviceProvider As IServiceProvider)
MyBase.new(serviceProvider)
End Sub
Public Overrides Sub ShowContextMenu(ByVal menuID As CommandID, ByVal x As Integer, ByVal y As Integer)
If menuID.ID = WorkflowMenuCommands.SelectionMenu.ID Then
Dim contextMenu As New ContextMenu()
For Each verb As DesignerVerb In Verbs
Dim MenuItem As New MenuItem(verb.Text, AddressOf OnMenuClicked)
MenuItem.Tag = verb
contextMenu.MenuItems.Add(MenuItem)
Next
Dim items As MenuItem() = GetSelectionMenuItems()
If (items.Length > 0) Then
contextMenu.MenuItems.Add(New MenuItem("-"))
For Each item As MenuItem In items
contextMenu.MenuItems.Add(item)
Next
Dim workflowView As WorkflowView = CType(GetService(GetType(WorkflowView)), WorkflowView)
If workflowView Is Nothing Then
contextMenu.Show(workflowView, workflowView.PointToClient(New Point(x, y)))
End If
End If
End If
End Sub
Private Function GetSelectionMenuItems() As MenuItem()
Dim menuItems As New List(Of MenuItem)()
Dim addMenuItems As Boolean = True
Dim selectionService As ISelectionService = CType(GetService(GetType(ISelectionService)), ISelectionService)
If selectionService IsNot Nothing Then
For Each obj As Object In selectionService.GetSelectedComponents()
If Not TypeOf obj Is Activity Then
addMenuItems = False
Exit For
End If
Next
End If
If (addMenuItems) Then
Dim selectionCommands As New Dictionary(Of CommandID, String)()
selectionCommands.Add(WorkflowMenuCommands.Cut, "Cut")
selectionCommands.Add(WorkflowMenuCommands.Copy, "Copy")
selectionCommands.Add(WorkflowMenuCommands.Paste, "Paste")
selectionCommands.Add(WorkflowMenuCommands.Delete, "Delete")
selectionCommands.Add(WorkflowMenuCommands.Collapse, "Collapse")
selectionCommands.Add(WorkflowMenuCommands.Expand, "Expand")
selectionCommands.Add(WorkflowMenuCommands.Disable, "Disable")
selectionCommands.Add(WorkflowMenuCommands.Enable, "Enable")
For Each id As CommandID In selectionCommands.Keys
Dim command As MenuCommand = FindCommand(id)
If command IsNot Nothing Then
Dim menuItem As New MenuItem(selectionCommands(id), AddressOf OnMenuClicked)
menuItem.Tag = command
menuItems.Add(menuItem)
End If
Next
End If
Return menuItems.ToArray()
End Function
Private Sub OnMenuClicked(ByVal sender As Object, ByVal e As EventArgs)
Dim menuItem As MenuItem = CType(sender, MenuItem)
If menuItem IsNot Nothing And TypeOf menuItem.Tag Is MenuCommand Then
Dim command As MenuCommand = CType(menuItem.Tag, MenuCommand)
command.Invoke()
End If
End Sub
End Class
To enable this service, call the AddService method of the LoaderHost property in a WorkflowDesignerLoader class as shown in the following example.
protected override void Initialize()
{
base.Initialize();
IDesignerLoaderHost host = this.LoaderHost;
if (host != null)
{
host.RemoveService(typeof(IIdentifierCreationService));
host.AddService(typeof(IIdentifierCreationService), new IdentifierCreationService(host));
host.AddService(typeof(IMenuCommandService), new WorkflowMenuCommandService(host));
host.AddService(typeof(IToolboxService), new Toolbox(host));
TypeProvider typeProvider = new TypeProvider(host);
typeProvider.AddAssemblyReference(typeof(string).Assembly.Location);
host.AddService(typeof(ITypeProvider), typeProvider, true);
host.AddService(typeof(IEventBindingService), new EventBindingService());
}
}
Protected Overrides Sub Initialize()
MyBase.Initialize()
Dim host As IDesignerLoaderHost = Me.LoaderHost
If host IsNot Nothing Then
host.RemoveService(GetType(IIdentifierCreationService))
host.AddService(GetType(IIdentifierCreationService), New IdentifierCreationService(host))
host.AddService(GetType(IMenuCommandService), New WorkflowMenuCommandService(host))
host.AddService(GetType(IToolboxService), New Toolbox(host))
Dim typeProvider As New TypeProvider(host)
typeProvider.AddAssemblyReference(GetType(String).Assembly.Location)
host.AddService(GetType(ITypeProvider), typeProvider, True)
host.AddService(GetType(IEventBindingService), New EventBindingService())
End If
End Sub
Remarks
The enable menu typically enables an activity on a workflow.
