Re: Extending System.Drawing.Rectangle...

Uh?

What about just casting the object from one to the other, with a cast
operator?  Don't need 3.0 to do that...  Although you need 2.0 to make it
clean, it's pretty easy with 1.0-1.1 with functions like ToRectangle() and
ctor(Rectangle)

Try that:
(And if you're not comfortable with VB, think of Reflector...)

Public Structure RectangleEx
    Public m_x As Integer
    Public m_y As Integer
    Public m_w As Integer
    Public m_h As Integer

    Public Property X() As Integer
        Get
            Return m_x
        End Get
        Set(ByVal value As Integer)
            m_x = value
        End Set
    End Property

    Public Property Y() As Integer
        Get
            Return m_y
        End Get
        Set(ByVal value As Integer)
            m_y = value
        End Set
    End Property

    Public Property Width() As Integer
        Get
            Return m_w
        End Get
        Set(ByVal value As Integer)
            m_w = value
        End Set
    End Property

    Public Property Height() As Integer
        Get
            Return m_h
        End Get
        Set(ByVal value As Integer)
            m_h = value
        End Set
    End Property

    Public Sub New(ByVal x As Integer, ByVal y As Integer, ByVal width As
Integer, ByVal height As Integer)
        m_x = x
        m_y = y
        m_w = width
        m_h = height
    End Sub

    Public Shared Narrowing Operator CType(ByVal item As RectangleEx) As
Rectangle
        Return New Rectangle(item.X, item.Y, item.Width, item.Height)
    End Operator

    Public Shared Widening Operator CType(ByVal item As Rectangle) As
RectangleEx
        Return New RectangleEx(item.X, item.Y, item.Width, item.Height)
    End Operator
End Structure

Have fun!

Dave.
www.omniscienttrader.com
www.omniscient.ca


-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps and
controls [mailto:[email protected]] On Behalf Of Chris
Anderson
Sent: April 18, 2007 2:28 AM
To: [email protected]
Subject: Re: [DOTNET-WINFORMS] Extending System.Drawing.Rectangle...

You'd probably need to wrap the Rectangle inside a new class and internally
use the Rectangle to perform standard Rectangle functionality, tgen add what
you want.
Of course you wouldn't be able to use the new class *as* a Rectangle where a
Rectangle was expected.

In .net 3.0 you *might* be able to use extension methods. ( not 100% sure if
you can use them on structs, but worth checking)

What extra functionality are you looking to add?

-----Original Message-----
From: "Gyorgy Bozoki"<[email protected]>
Sent: 18/04/07 05:30:47
To:
"[email protected]"<[email protected]>
Subject: [DOTNET-WINFORMS] Extending System.Drawing.Rectangle...

Hi all,

I have a question about extending structs: I'd like extend
System.Drawing.Rectangle such that it keeps all its existing functionality
and a set of new public members can be called. Since Rectangle is a
structure, it's sealed and cannot be derived from, so that route is
obviously out.

I could easily create a simple new class that would have all the
functionality of Rectangle and the extra functions that I want to add, but I
was wondering if doing this to Rectangle itself would even be technically
possible (for example during run time, if necessary.)

Thanks,
Gyorgy Bozoki





-----Unmodified Original Message-----
Hi all,

I have a question about extending structs: I'd like extend
System.Drawing.Rectangle such that it keeps all its existing functionality
and a set of new public members can be called. Since Rectangle is a
structure, it's sealed and cannot be derived from, so that route is
obviously out.

I could easily create a simple new class that would have all the
functionality of Rectangle and the extra functions that I want to add, but I
was wondering if doing this to Rectangle itself would even be technically
possible (for example during run time, if necessary.)

Thanks,
Gyorgy Bozoki