ContainerControl Class
Provides focus management functionality for controls that can function as a container for other controls.
For a list of all members of this type, see ContainerControl Members.
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.Control
System.Windows.Forms.ScrollableControl
System.Windows.Forms.ContainerControl
System.Windows.Forms.Form
System.Windows.Forms.PropertyGrid
System.Windows.Forms.UpDownBase
System.Windows.Forms.UserControl
[Visual Basic] Public Class ContainerControl Inherits ScrollableControl Implements IContainerControl [C#] public class ContainerControl : ScrollableControl, IContainerControl [C++] public __gc class ContainerControl : public ScrollableControl, IContainerControl [JScript] public class ContainerControl extends ScrollableControl implements IContainerControl
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Remarks
A ContainerControl represents a control that can function as a container for other controls and provides focus management. Controls that inherit from this class can track the active control they contain, even when the focus moves somewhere within a different container.
ContainerControl objects provide a logical boundary for contained controls. The container control can capture the TAB key press and move focus to the next control in the collection.
Note The container control does not receive focus; the focus is always set to the first child control in the collection of contained controls.
You do not typically inherit directly from this class. Form, UserControl, and UpDownBase classes inherit from ContainerControl.
Example
[Visual Basic, C#, C++] The following example inherits from the ScrollableControl class and implements the IContainerControl interface. Implementation is added to the ActiveControl property and the ActivateControl method.
[Visual Basic] Imports System 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 [C#] 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; } } [C++] using namespace System; using namespace System::Windows::Forms; using namespace System::Drawing; public __gc 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; } // Add implementation to the IContainerControl.ActiveControl property. __property Control* get_ActiveControl() { return activeControl; } __property void set_ActiveControl(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. 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; } };
[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Namespace: System.Windows.Forms
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
See Also
ContainerControl Members | System.Windows.Forms Namespace | Form | UserControl | UpDownBase | IContainerControl | ScrollableControl