IDesignerEventService Schnittstelle

Definition

Namespace:

System.ComponentModel.Design

Assembly:

System.ComponentModel.TypeConverter.dll

Stellt Ereignisbenachrichtungen bereit, wenn Stammdesigner hinzugefügt und entfernt werden und wenn eine ausgewählte Komponente oder der aktuelle Stammdesigner geändert werden.

public interface class IDesignerEventService

public interface IDesignerEventService

type IDesignerEventService = interface

Public Interface IDesignerEventService

Beispiele

In diesem Beispiel wird ein Designer veranschaulicht, der verwendet, IDesignerEventService um Ereignisbenachrichtigungen für ein Steuerelement anzuzeigen. Um dieses Beispiel zu verwenden, kompilieren Sie den Code in eine Klassenbibliothek. Fügen Sie einem neuen Windows Forms-Projekt einen Verweis auf die Bibliothek hinzu, und fügen Sie das Steuerelement innerhalb der Bibliothek der Toolbox hinzu. Fügen Sie einem Formular im Entwurfsmodus eine instance des DesignerMonitor Steuerelements hinzu. Klicken Sie mit der rechten Maustaste auf das Steuerelement, und klicken Sie auf den Start monitoring Befehl, um Benachrichtigungen zu Ereignissen anzuzeigen, die IDesignerEventServicevom ausgelöst werden.

#using <system.dll>
#using <system.design.dll>
#using <system.windows.forms.dll>
#using <system.drawing.dll>

using namespace System;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Collections;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;

namespace DesignerEventServiceExample
{
   ref class DesignerMonitorDesigner;

   // DesignerMonitor provides a display for designer event notifications.

   [Designer(DesignerEventServiceExample::DesignerMonitorDesigner::typeid)]
   public ref class DesignerMonitor: public UserControl
   {
   public:

      // List to contain strings that describe designer events.
      ArrayList^ updates;
      bool monitoring_events;
      DesignerMonitor()
      {
         monitoring_events = false;
         updates = gcnew ArrayList;
         this->BackColor = Color::White;
         this->Size = System::Drawing::Size( 450, 300 );
      }

   protected:

      // Display the message for the current mode, and any event messages if event monitoring is active.
      virtual void OnPaint( PaintEventArgs^ e ) override
      {
         e->Graphics->DrawString( "IDesignerEventService DesignerMonitor Control", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Blue ), 5, 4 );
         int yoffset = 10;
         if (  !monitoring_events )
         {
            yoffset += 10;
            e->Graphics->DrawString( "Currently not monitoring designer events.", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Black ), 5.f, yoffset + 10.f );
            e->Graphics->DrawString( "Use the shortcut menu commands", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Black ), 5.f, yoffset + 30.f );
            e->Graphics->DrawString( "provided by an associated DesignerMonitorDesigner", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Black ), 5.f, yoffset + 40.f );
            e->Graphics->DrawString( "to start or stop monitoring.", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Black ), 5.f, yoffset + 50.f );
         }
         else
         {
            e->Graphics->DrawString( "Currently monitoring designer events.", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::DarkBlue ), 5.f, yoffset + 10.f );
            e->Graphics->DrawString( "Designer created, changed and disposed events:", gcnew System::Drawing::Font( FontFamily::GenericMonospace,9 ), gcnew SolidBrush( Color::Brown ), 5.f, yoffset + 35.f );
            for ( int i = 0; i < updates->Count; i++ )
            {
               e->Graphics->DrawString( static_cast<String^>(updates[ i ]), gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5.f, yoffset + 55.f + (10 * i) );
               yoffset += 10;
            }
         }
      }
   };

   // DesignerMonitorDesigner uses the IDesignerEventService to send event information
   // to an associated DesignerMonitor control's updates collection.
   public ref class DesignerMonitorDesigner: public ControlDesigner
   {
   private:
      DesignerMonitor^ dm;
      DesignerVerbCollection^ dvc;
      int eventcount;
      void StopMonitoring( Object^ /*sender*/, EventArgs^ /*e*/ )
      {
         IDesignerEventService^ des = dynamic_cast<IDesignerEventService^>(this->Control->Site->GetService( IDesignerEventService::typeid ));
         if ( des != nullptr )
         {
            // Remove event handlers for event notification methods.
            des->DesignerCreated -= gcnew DesignerEventHandler( this, &DesignerMonitorDesigner::DesignerCreated );
            des->DesignerDisposed -= gcnew DesignerEventHandler( this, &DesignerMonitorDesigner::DesignerDisposed );
            des->ActiveDesignerChanged -= gcnew ActiveDesignerEventHandler( this, &DesignerMonitorDesigner::DesignerChanged );
            des->SelectionChanged -= gcnew EventHandler( this, &DesignerMonitorDesigner::SelectionChanged );
            dm->monitoring_events = false;

            // Rebuild menu with "Start monitoring" command.
            array<DesignerVerb^>^myArray = {gcnew DesignerVerb( "Start monitoring",gcnew EventHandler( this, &DesignerMonitorDesigner::StartMonitoring ) )};
            dvc = gcnew DesignerVerbCollection( myArray );
            dm->Refresh();
         }
      }

      void StartMonitoring( Object^ /*sender*/, EventArgs^ /*e*/ )
      {
         IDesignerEventService^ des = dynamic_cast<IDesignerEventService^>(this->Control->Site->GetService( IDesignerEventService::typeid ));
         if ( des != nullptr )
         {
            // Add event handlers for event notification methods.
            des->DesignerCreated += gcnew DesignerEventHandler( this, &DesignerMonitorDesigner::DesignerCreated );
            des->DesignerDisposed += gcnew DesignerEventHandler( this, &DesignerMonitorDesigner::DesignerDisposed );
            des->ActiveDesignerChanged += gcnew ActiveDesignerEventHandler( this, &DesignerMonitorDesigner::DesignerChanged );
            des->SelectionChanged += gcnew EventHandler( this, &DesignerMonitorDesigner::SelectionChanged );
            dm->monitoring_events = false;

            // Rebuild menu with "Stop monitoring" command.
            array<DesignerVerb^>^myArray = {gcnew DesignerVerb( "Stop monitoring",gcnew EventHandler( this, &DesignerMonitorDesigner::StopMonitoring ) )};
            dvc = gcnew DesignerVerbCollection( myArray );
            dm->Refresh();
         }
      }

      void DesignerCreated( Object^ /*sender*/, DesignerEventArgs^ e )
      {
         UpdateStatus( "Designer for " + e->Designer->RootComponent->Site->Name + " was created." );
      }

      void DesignerDisposed( Object^ /*sender*/, DesignerEventArgs^ e )
      {
         UpdateStatus( "Designer for " + e->Designer->RootComponent->Site->Name + " was disposed." );
      }

      void DesignerChanged( Object^ /*sender*/, ActiveDesignerEventArgs^ e )
      {
         UpdateStatus( "Active designer moved from " + e->OldDesigner->RootComponent->Site->Name + " to " + e->NewDesigner->RootComponent->Site->Name + "." );
      }

      void SelectionChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
      {
         UpdateStatus("A component selection was changed.");
      }

      // Update message buffer on DesignerMonitor control.
      void UpdateStatus( String^ newmsg )
      {
         if ( dm->updates->Count > 10 )
                  dm->updates->RemoveAt( 10 );

         dm->updates->Insert( 0, "Event #" + eventcount.ToString() + ": " + newmsg );
         eventcount++;
         dm->Refresh();
      }
   };
}

Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.Design

Namespace DesignerEventServiceExample

    ' DesignerMonitor provides a display for designer event notifications.
    <Designer(GetType(DesignerMonitorDesigner))> _
    Public Class DesignerMonitor
        Inherits System.Windows.Forms.UserControl

        ' List to contain strings that describe designer events.
        Public updates As ArrayList
        Public monitoring_events As Boolean = False

        Public Sub New()
            updates = New ArrayList()
            Me.BackColor = Color.Beige
            Me.Size = New Size(450, 300)
        End Sub    

        ' Display the message for the current mode, and any event messages if monitoring events
        Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
            e.Graphics.DrawString("IDesignerEventService DesignerMonitor control", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Red), 5, 4)
            Dim yoffset As Integer = 10
            If Not monitoring_events Then
                yoffset += 10
                e.Graphics.DrawString("Currently not monitoring designer events.", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Black), 5, yoffset + 10)
                e.Graphics.DrawString("Use the shortcut menu commands", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Black), 5, yoffset + 30)
                e.Graphics.DrawString("provided by an associated DesignerMonitorDesigner", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Black), 5, yoffset + 40)
                e.Graphics.DrawString("to start or stop monitoring.", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Black), 5, yoffset + 50)
            Else
                e.Graphics.DrawString("Currently monitoring designer events.", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.DarkBlue), 5, yoffset + 10)
                e.Graphics.DrawString("Designer created, changed and disposed events:", New Font(FontFamily.GenericMonospace, 9), New SolidBrush(Color.Brown), 5, yoffset + 35)
                Dim i As Integer
                For i = 0 To updates.Count - 1
                    e.Graphics.DrawString(CStr(updates(i)), New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, yoffset + 55 + 10 * i)
                    yoffset += 10
                Next i
            End If
        End Sub 
    End Class   

    ' DesignerMonitorDesigner uses the IDesignerEventService to send event information 
    ' to an associated DesignerMonitor control's updates collection.
    Public Class DesignerMonitorDesigner
        Inherits System.Windows.Forms.Design.ControlDesigner
        Private dm As DesignerMonitor = Nothing
        Private dvc As DesignerVerbCollection = Nothing
        Private eventcount As Integer = 0

        Public Sub New()
            ' Initializes the designer's shortcut menu with a "Start monitoring" command.
            dvc = New DesignerVerbCollection(New DesignerVerb() {New DesignerVerb("Start monitoring", AddressOf Me.StartMonitoring)})
        End Sub  

        Public Overrides Sub Initialize(ByVal component As System.ComponentModel.IComponent)
            MyBase.Initialize(component)

            Dim o As Object
            o = component
            
            If o.GetType() IsNot GetType(DesignerMonitor) Then
                Throw New Exception("This designer requires a DesignerMonitor control.")
            End If
            dm = CType(component, DesignerMonitor)
        End Sub   

        Public Overrides ReadOnly Property Verbs() As System.ComponentModel.Design.DesignerVerbCollection
            Get
                Return dvc
            End Get
        End Property

        Private Sub StopMonitoring(ByVal sender As Object, ByVal e As EventArgs)
            Dim des As IDesignerEventService = CType(Me.Control.Site.GetService(GetType(IDesignerEventService)), IDesignerEventService)
            If des Is Nothing Then
                Return
            End If
            ' Remove event handlers for event notification methods.
            RemoveHandler des.DesignerCreated, AddressOf Me.DesignerCreated
            RemoveHandler des.DesignerDisposed, AddressOf Me.DesignerDisposed
            RemoveHandler des.ActiveDesignerChanged, AddressOf Me.DesignerChanged
            RemoveHandler des.SelectionChanged, AddressOf Me.SelectionChanged

            dm.monitoring_events = False
            ' Rebuild menu with "Start monitoring" command.
            dvc = New DesignerVerbCollection(New DesignerVerb() {New DesignerVerb("Start monitoring", AddressOf Me.StartMonitoring)})
            dm.Refresh()
        End Sub 

        Private Sub StartMonitoring(ByVal sender As Object, ByVal e As EventArgs)
            Dim des As IDesignerEventService = CType(Me.Control.Site.GetService(GetType(IDesignerEventService)), IDesignerEventService)
            If des Is Nothing Then
                Return
            End If
            ' Add event handlers for event notification methods.
            AddHandler des.DesignerCreated, AddressOf Me.DesignerCreated
            AddHandler des.DesignerDisposed, AddressOf Me.DesignerDisposed
            AddHandler des.ActiveDesignerChanged, AddressOf Me.DesignerChanged
            AddHandler des.SelectionChanged, AddressOf Me.SelectionChanged

            dm.monitoring_events = True
            ' Rebuild menu with "Stop monitoring" command.
            dvc = New DesignerVerbCollection(New DesignerVerb() {New DesignerVerb("Stop monitoring", AddressOf Me.StopMonitoring)})
            dm.Refresh()
        End Sub      

        Private Sub DesignerCreated(ByVal sender As Object, ByVal e As DesignerEventArgs)
            UpdateStatus(("Designer for " + e.Designer.RootComponent.Site.Name + " was created."))
        End Sub     

        Private Sub DesignerDisposed(ByVal sender As Object, ByVal e As DesignerEventArgs)
            UpdateStatus(("Designer for " + e.Designer.RootComponent.Site.Name + " was disposed."))
        End Sub 

        Private Sub DesignerChanged(ByVal sender As Object, ByVal e As ActiveDesignerEventArgs)
            UpdateStatus(("Active designer moved from " + e.OldDesigner.RootComponent.Site.Name + " to " + e.NewDesigner.RootComponent.Site.Name + "."))
        End Sub    

        Private Sub SelectionChanged(ByVal sender As Object, ByVal e As EventArgs)
            UpdateStatus("A component selection was changed.")
        End Sub       

        ' Update message buffer on DesignerMonitor control.
        Private Sub UpdateStatus(ByVal newmsg As String)
            If dm.updates.Count > 10 Then
                dm.updates.RemoveAt(10)
            End If
            dm.updates.Insert(0, "Event #" + eventcount.ToString() + ": " + newmsg)
            eventcount += 1
            dm.Refresh()
        End Sub 

    End Class 
End Namespace

Hinweise

IDesignerEventService stellt eine Benachrichtigung bereit, wenn ein neuer Stamm-Designer erstellt, geändert oder verworfen wird. Ein Stamm-Designer bietet Entwurfszeitunterstützung für die Basiskomponente eines Dokuments in der Designeransicht. Das SelectionChanged Ereignis stellt eine Benachrichtigung bereit, wenn sich die aktuelle Komponentenauswahl geändert hat.

Eigenschaften

ActiveDesigner	Ruft den Stammdesigner für das aktuell aktive Dokument ab.
Designers	Ruft eine Auflistung von Stammdesignern für Entwurfsdokumente ab, die in der Entwicklungsumgebung zur Zeit aktiv sind.

Ereignisse

ActiveDesignerChanged	Tritt ein, wenn sich der aktuelle Stammdesigner ändert.
DesignerCreated	Tritt beim Erstellen eines Stammdesigners ein.
DesignerDisposed	Tritt ein, wenn ein Stammdesigner für ein Dokument freigegeben wird.
SelectionChanged	Tritt ein, wenn die aktuelle Auswahl für die Entwurfsansicht geändert wird.

Weitere Informationen

• DesignerEventHandler