Behavior Class

Definition

Namespace:

System.Windows.Forms.Design.Behavior

Assembly:

System.Windows.Forms.Design.dll

Represents the Behavior objects that are managed by a BehaviorService.

public ref class Behavior abstract

public abstract class Behavior

type Behavior = class

Public MustInherit Class Behavior

Inheritance

Object

Behavior

Examples

The following code example demonstrates how to create your own class based on the Behavior class that responds to user clicks. This code example is part of a larger example provided for the BehaviorService class.

// By providing our own behavior we can do something
// interesting when the user clicks or manipulates our glyph.
public  ref class DemoBehavior : public Behavior
{
public:
    bool OnMouseUp(Glyph^ g, MouseButtons^ button)
    {
        MessageBox::Show("Hey, you clicked the mouse here");

        // indicating we processed this event.
        return true;
    }
};

public ref class DemoGlyph : public Glyph
{
    Control^ control;
    BehaviorService^ behavior;

public:
    DemoGlyph(BehaviorService^ behavior, Control^ control):
      Glyph(gcnew BehaviorServiceSample::DemoBehavior)
      {
          this->behavior = behavior;
          this->control = control;
      }

public:
    virtual property Rectangle Bounds
    {
        Rectangle get() override
        {
            // Create a glyph that is 10x10 and sitting
            // in the middle of the control.  Glyph coordinates
            // are in adorner window coordinates, so we must map
            // using the behavior service.
            Point edge = behavior->ControlToAdornerWindow(control);
            Size size = control->Size;
            Point center = Point(edge.X + (size.Width / 2),
                edge.Y + (size.Height / 2));

            Rectangle bounds = Rectangle(center.X - 5,
                center.Y - 5, 10, 10);

            return bounds;
        }
    }

public:
    virtual Cursor^ GetHitTest(Point p) override
    {
        // GetHitTest is called to see if the point is
        // within this glyph.  This gives us a chance to decide
        // what cursor to show.  Returning null from here means
        // the mouse pointer is not currently inside of the
        // glyph.  Returning a valid cursor here indicates the
        // pointer is inside the glyph, and also enables our
        // Behavior property as the active behavior.
        if (Bounds.Contains(p))
        {
            return Cursors::Hand;
        }
        return nullptr;
    }

public:
    virtual void Paint(PaintEventArgs^ pe) override
    {
        // Draw our glyph.  Our's is simple:  a blue ellipse.
        pe->Graphics->FillEllipse(Brushes::Blue, Bounds);
    }
};

class MyGlyph : Glyph
{
    Control control;
    BehaviorService behaviorSvc;

    public MyGlyph(BehaviorService behaviorSvc, Control control) : 
        base(new MyBehavior())
    {
        this.behaviorSvc = behaviorSvc;
        this.control = control;
    }

    public override Rectangle Bounds
    {
        get
        {
            // Create a glyph that is 10x10 and sitting
            // in the middle of the control.  Glyph coordinates
            // are in adorner window coordinates, so we must map
            // using the behavior service.
            Point edge = behaviorSvc.ControlToAdornerWindow(control);
            Size size = control.Size;
            Point center = new Point(edge.X + (size.Width / 2), 
                edge.Y + (size.Height / 2));

            Rectangle bounds = new Rectangle(
                center.X - 5,
                center.Y - 5,
                10,
                10);

            return bounds;
        }
    }

    public override Cursor GetHitTest(Point p)
    {
        // GetHitTest is called to see if the point is
        // within this glyph.  This gives us a chance to decide
        // what cursor to show.  Returning null from here means
        // the mouse pointer is not currently inside of the glyph.
        // Returning a valid cursor here indicates the pointer is
        // inside the glyph, and also enables our Behavior property
        // as the active behavior.
        if (Bounds.Contains(p))
        {
            return Cursors.Hand;
        }

        return null;
    }

    public override void Paint(PaintEventArgs pe)
    {
        // Draw our glyph. It is simply a blue ellipse.
        pe.Graphics.FillEllipse(Brushes.Blue, Bounds);
    }

    // By providing our own behavior we can do something interesting
    // when the user clicks or manipulates our glyph.
    class MyBehavior : Behavior
    {
        public override bool OnMouseUp(Glyph g, MouseButtons button)
        {
            MessageBox.Show("Hey, you clicked the mouse here");
            return true; // indicating we processed this event.
        }
    }
}

Class MyGlyph
    Inherits Glyph
    Private control As Control
    Private behaviorSvc As _
        System.Windows.Forms.Design.Behavior.BehaviorService

    Public Sub New(ByVal behaviorSvc As _
        System.Windows.Forms.Design.Behavior.BehaviorService, _
        ByVal control As Control)

        MyBase.New(New MyBehavior())
        Me.behaviorSvc = behaviorSvc
        Me.control = control
    End Sub

    Public Overrides ReadOnly Property Bounds() As Rectangle
        Get
            ' Create a glyph that is 10x10 and sitting
            ' in the middle of the control.  Glyph coordinates
            ' are in adorner window coordinates, so we must map
            ' using the behavior service.
            Dim edge As Point = behaviorSvc.ControlToAdornerWindow(control)
            Dim size As Size = control.Size
            Dim center As New Point(edge.X + size.Width / 2, edge.Y + _
                size.Height / 2)

            Dim bounds1 As New Rectangle(center.X - 5, center.Y - 5, 10, 10)

            Return bounds1
        End Get
    End Property

    Public Overrides Function GetHitTest(ByVal p As Point) As Cursor
        ' GetHitTest is called to see if the point is
        ' within this glyph.  This gives us a chance to decide
        ' what cursor to show.  Returning null from here means
        ' the mouse pointer is not currently inside of the glyph.
        ' Returning a valid cursor here indicates the pointer is
        ' inside the glyph,and also enables our Behavior property
        ' as the active behavior.
        If Bounds.Contains(p) Then
            Return Cursors.Hand
        End If

        Return Nothing

    End Function


    Public Overrides Sub Paint(ByVal pe As PaintEventArgs)
        ' Draw our glyph.  It is simply a blue ellipse.
        pe.Graphics.FillEllipse(Brushes.Blue, Bounds)

    End Sub

    ' By providing our own behavior we can do something interesting
    ' when the user clicks or manipulates our glyph.

    Class MyBehavior
        Inherits System.Windows.Forms.Design.Behavior.Behavior

        Public Overrides Function OnMouseUp(ByVal g As Glyph, _
            ByVal button As MouseButtons) As Boolean
            MessageBox.Show("Hey, you clicked the mouse here")
            Return True
            ' indicating we processed this event.
        End Function 'OnMouseUp
    End Class

End Class

Remarks

This class can be extended to develop any type of user interface behavior, including selection, drag, and resize behaviors.

For more information, see Behavior Service Overview.

Note

Your Behavior type must be associated with a Glyph type. Glyph-independent behaviors are not supported.

Constructors

Behavior()	Initializes a new instance of the Behavior class.
Behavior(Boolean, BehaviorService)	Initializes a new instance of the Behavior class with the given BehaviorService.

Properties

Cursor	Gets the cursor that should be displayed for this behavior.
DisableAllCommands	Gets a value indicating whether MenuCommand objects should be disabled.

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
FindCommand(CommandID)	Intercepts commands.
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnDragDrop(Glyph, DragEventArgs)	Permits custom drag-and-drop behavior.
OnDragEnter(Glyph, DragEventArgs)	Permits custom drag-enter behavior.
OnDragLeave(Glyph, EventArgs)	Permits custom drag-leave behavior.
OnDragOver(Glyph, DragEventArgs)	Permits custom drag-over behavior.
OnGiveFeedback(Glyph, GiveFeedbackEventArgs)	Permits custom drag-and-drop feedback behavior.
OnLoseCapture(Glyph, EventArgs)	Called by the adorner window when it loses mouse capture.
OnMouseDoubleClick(Glyph, MouseButtons, Point)	Called when any double-click message enters the adorner window of the BehaviorService.
OnMouseDown(Glyph, MouseButtons, Point)	Called when any mouse-down message enters the adorner window of the BehaviorService.
OnMouseEnter(Glyph)	Called when any mouse-enter message enters the adorner window of the BehaviorService.
OnMouseHover(Glyph, Point)	Called when any mouse-hover message enters the adorner window of the BehaviorService.
OnMouseLeave(Glyph)	Called when any mouse-leave message enters the adorner window of the BehaviorService.
OnMouseMove(Glyph, MouseButtons, Point)	Called when any mouse-move message enters the adorner window of the BehaviorService.
OnMouseUp(Glyph, MouseButtons)	Called when any mouse-up message enters the adorner window of the BehaviorService.
OnQueryContinueDrag(Glyph, QueryContinueDragEventArgs)	Sends this drag-and-drop event from the adorner window to the appropriate Behavior or hit-tested Glyph.
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• Glyph
• BehaviorService
• MenuCommand
• How to: Extend the Appearance and Behavior of Controls in Design Mode
• Behavior Service Overview