WorkflowMenuCommands 构造函数
定义
初始化 WorkflowMenuCommands 类的新实例。Initializes a new instance of the WorkflowMenuCommands class.
public:
WorkflowMenuCommands();
public WorkflowMenuCommands ();
Public Sub New ()
示例
下面的示例演示如何创建自定义 MenuCommandService。The following example demonstrates how to create a custom MenuCommandService. 在此示例中,当调用 ShowContextMenu 时会创建一个上下文菜单。In this example, a context menu is created when the ShowContextMenu is called. 在 GetSelectionMenuItems 方法中,使用 WorkflowMenuCommands 类将工作流设计器提供的适当菜单命令与其对应文本相关联。In the GetSelectionMenuItems method, the WorkflowMenuCommands class is utilized to associate the proper menu commands provided by the workflow designer with their corresponding text. 此操作完成后,将一个事件处理程序与每个命令相关联,以便在选择该命令时,调用相应的 MenuCommand。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
若要启用此服务,请调用 AddService 类中 LoaderHost 属性的 WorkflowDesignerLoader 方法,如下面的示例所示。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