Export (0) Print
Expand All

IContainerControl::ActiveControl Property

Gets or sets the control that is active on the container control.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

property Control^ ActiveControl {
	Control^ get ();
	void set (Control^ value);
}

Property Value

Type: System.Windows.Forms::Control
The Control that is currently active on the container control.

Notes to Implementers

When implemented in a class, this property activates or retrieves the active control on the container control.

The following example inherits from the ScrollableControl class and implements the IContainerControl interface. Implementation is added to the ActiveControl property and the ActivateControl method.

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;
   }
};

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Show:
© 2015 Microsoft