SimpleShape.OnBackgroundImageChanged Method

Raises the BackgroundImageChanged event.

Namespace:  Microsoft.VisualBasic.PowerPacks
Assembly:  Microsoft.VisualBasic.PowerPacks.Vs (in Microsoft.VisualBasic.PowerPacks.Vs.dll)

Syntax

'Declaration
Protected Overridable Sub OnBackgroundImageChanged ( _
    e As EventArgs _
)

protected virtual void OnBackgroundImageChanged(
    EventArgs e
)

protected:
virtual void OnBackgroundImageChanged(
    EventArgs^ e
)

abstract OnBackgroundImageChanged : 
        e:EventArgs -> unit  
override OnBackgroundImageChanged : 
        e:EventArgs -> unit

protected function OnBackgroundImageChanged(
    e : EventArgs
)

Parameters

• e
  Type: EventArgs

  An EventArgs that contains the event data.

Remarks

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnBackgroundImageChanged method also enables derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When overriding OnBackgroundImageChanged in a derived class, be sure to call the OnBackgroundImageChanged method of the base class so that registered delegates receive the event.

Examples

The following example is a method that is executed when the Click event occurs. The Shape class has several methods that have the name pattern OnEventName that execute methods when the EventName event occurs. (EventName represents the name of the corresponding event.)

The following example demonstrates how to override the OnClick and OnLostFocus methods in a class that derives from LineShape.

Public Class HighlightLine
    Inherits LineShape
    Protected Overrides Sub OnClick(ByVal e As EventArgs)
        ' Change the color of the line when clicked. 
        Me.BorderColor = Color.Red
        MyBase.OnClick(e)
    End Sub 
    Protected Overrides Sub OnLostFocus(ByVal e As System.EventArgs)
        ' Change the color of the line when focus is changed. 
        Me.BorderColor = Color.Black
        MyBase.OnLostFocus(e)
    End Sub 
End Class

public class HighlightLine :
    LineShape
{
    protected override void OnClick(EventArgs e)
    {
        // Change the color of the line when clicked. 
        this.BorderColor = Color.Red;
        base.OnClick(e);
    }
    protected override void OnLostFocus(System.EventArgs e)
    {
        // Change the color of the line when focus is changed. 
        this.BorderColor = Color.Black;
        base.OnLostFocus(e);
    }
}

.NET Framework Security

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

See Also

Reference

SimpleShape Class

Microsoft.VisualBasic.PowerPacks Namespace

Other Resources

Introduction to the Line and Shape Controls (Visual Studio)

How to: Draw Lines with the LineShape Control (Visual Studio)

How to: Draw Shapes with the OvalShape and RectangleShape Controls (Visual Studio)