ContainerControl.ActiveControl Özellik

Tanım

Ad Alanı:

System.Windows.Forms

Bütünleştirilmiş Kod:

System.Windows.Forms.dll

Kapsayıcı denetimindeki etkin denetimi alır veya ayarlar.

public:
 property System::Windows::Forms::Control ^ ActiveControl { System::Windows::Forms::Control ^ get(); void set(System::Windows::Forms::Control ^ value); };

[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.Control ActiveControl { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.ActiveControl : System.Windows.Forms.Control with get, set

Public Property ActiveControl As Control

Özellik Değeri

Control

Control üzerinde şu anda etkin ContainerContrololan.

Uygulamalar

ActiveControl

Öznitelikler

BrowsableAttribute

Özel durumlar

ArgumentException

Atanan Control etkinleştirilemedi.

Örnekler

Aşağıdaki kod örneği sınıfından ScrollableControl devralır ve arabirimini IContainerControl uygular. Uygulama özelliğine ActiveControl ve yöntemine ActivateControl eklenir.

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;

public ref class MyContainer: public ScrollableControl, public IContainerControl
{
private:
   Control^ activeControl;

public:
   MyContainer()
   {
      // Make the container control Blue so it can be distinguished on the form.
      this->BackColor = Color::Blue;

      // Make the container scrollable.
      this->AutoScroll = true;
   }

   property Control^ ActiveControl 
   {
      // Add implementation to the IContainerControl.ActiveControl property.
      virtual Control^ get()
      {
         return activeControl;
      }

      virtual void set( Control^ value )
      {
         
         // Make sure the control is a member of the ControlCollection.
         if ( this->Controls->Contains( value ) )
         {
            activeControl = value;
         }
      }
   }

   // Add implementations to the IContainerControl.ActivateControl(Control) method.
   virtual bool ActivateControl( Control^ active )
   {
      if ( this->Controls->Contains( active ) )
      {
         // Select the control and scroll the control into view if needed.
         active->Select(  );
         this->ScrollControlIntoView( active );
         this->activeControl = active;
         return true;
      }

      return false;
   }
};

using System;
using System.Windows.Forms;
using System.Drawing;

    public class MyContainer : ScrollableControl, IContainerControl
    {
        private Control activeControl;
        public MyContainer() 
        {
            // Make the container control Blue so it can be distinguished on the form.
            this.BackColor = Color.Blue;
            
            // Make the container scrollable.
            this.AutoScroll = true;
        }

        // Add implementation to the IContainerControl.ActiveControl property.
        public Control ActiveControl
        {
            get
            {
                return activeControl;
            }

            set
            {
                // Make sure the control is a member of the ControlCollection.
                if(this.Controls.Contains(value))
                {
                    activeControl = value;
                }
            }
        }

        // Add implementations to the IContainerControl.ActivateControl(Control) method.
        public bool ActivateControl(Control active)
        {
            if(this.Controls.Contains(active))
            {
                // Select the control and scroll the control into view if needed.
                active.Select();
                this.ScrollControlIntoView(active);
                this.activeControl = active;
                return true;
            }
            return false;
        }
    }

Imports System.Windows.Forms
Imports System.Drawing

   Public Class MyContainerControl
      Inherits ScrollableControl
      Implements IContainerControl 

      Private myActiveControl As Control
      
      Public Sub New()
         ' Make the container control Blue so it can be distinguished on the form.
         Me.BackColor = Color.Blue
         
         ' Make the container scrollable.
         Me.AutoScroll = True
      End Sub 
      
      ' Add implementation to the IContainerControl.ActiveControl property.
      Public Property ActiveControl() As Control Implements IContainerControl.ActiveControl
         Get
            Return Me.myActiveControl
         End Get
         
         Set
            ' Make sure the control is a member of the ControlCollection.
            If Me.Controls.Contains(value) Then
               Me.myActiveControl = value
            End If
         End Set
      End Property
      
      ' Add implementation to the IContainerControl.ActivateControl(Control) method.
      public Function ActivateControl(active As Control) As Boolean Implements IContainerControl.ActivateControl
         If Me.Controls.Contains(active) Then
            ' Select the control and scroll the control into view if needed.
            active.Select()
            Me.ScrollControlIntoView(active)
            Me.myActiveControl = active
            Return True
         End If
         Return False
      End Function 

   End Class

Açıklamalar

ActiveControl özelliği kapsayıcı denetimindeki etkin denetimi etkinleştirir veya alır.

Bu özellikten geçerli bir değer almak için çağıran nesnenin çağırılan denetimde bulunması veya içermesi gerekir. Bir form başka bir formun ActiveControl özelliklerini çağırmaya çalışırsa tanımsız bir değer alır. Bu durumda, bu verileri geçirmek için formlar arasında kendi iletişim mekanizmanızı tanımlamanız gerekir.

Ayrıca bkz.

• ScrollableControl
• Control