WorkflowMenuCommands.Expand Bidang
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Yang CommandID dapat digunakan untuk mengakses menu perluas. Bidang ini hanya-baca.
public: static initonly System::ComponentModel::Design::CommandID ^ Expand;
public static readonly System.ComponentModel.Design.CommandID Expand;
staticval mutable Expand : System.ComponentModel.Design.CommandID
Public Shared ReadOnly Expand As CommandID
Nilai Bidang
Contoh
Contoh berikut menunjukkan cara membuat kustom MenuCommandService. Dalam contoh ini, menu konteks dibuat saat dipanggil ShowContextMenu
.
GetSelectionMenuItems
Dalam metode , WorkflowMenuCommands kelas digunakan untuk mengaitkan perintah menu yang tepat yang disediakan oleh perancang alur kerja dengan teks yang sesuai. Setelah ini selesai, penanganan aktivitas dikaitkan dengan setiap perintah sehingga ketika perintah dipilih, yang sesuai MenuCommand
dipanggil.
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
Untuk mengaktifkan layanan ini, panggil AddService
metode LoaderHost properti di kelas seperti yang WorkflowDesignerLoader ditunjukkan dalam contoh berikut.
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
Keterangan
Menu perluas biasanya menyebabkan bagian kode yang diciutkan diperluas.