Hi! Can u please tech me a way to know if the image in the picturebox has
changed? what event should i catch the chage?
Jul 21 '05
15  1824 
Hi,
Here is a Picture box control with two extra events , before image changed
and after image changed...
Imports System
Imports System.Windows. Forms
Imports System.Drawing. Drawing2D
Imports System.Drawing
<ToolboxBitmap( GetType(Picture Box))> _
Public Class adxPictureContr ol
Inherits PictureBox
Private _image As System.Drawing. Image
Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Public Shadows Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
If Not Value Is _image Then
If Me.DesignMode Then
MyBase.Image = Value
_image = Value
Else
Dim ea As New EventArgsImageC hanged
If Not _image Is Nothing Then
RaiseEvent ImageBeforeChan ged(Me, ea)
If ea.Cancel = True Then
Exit Property
End If
End If
MyBase.Image = Value
_image = Value
RaiseEvent ImageAfterChang ed(Me, ea)
End If
End If
End Set
End Property
End Class
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Public Property Cancel() As Boolean
Get
Return _cancel
End Get
Set(ByVal Value As Boolean)
_cancel = Value
End Set
End Property
End Class
"Cor Ligthert" wrote: me 2 ;-)
Has to do with politness, I am sorry that you did not understand it.
When the OP ask something what is for you strange because the answer is
obvious, than you can give an answer, however you can as well do what I did
and ask what he means with his question, although you know almost for sure
your answer.
When than somebody else give in a (in my opinion kind of rude way) that
answer I am not happy.
In that way the OP will probably never ask a question here again.
I can than write nothing or ask to do it not again the next time.
Clear?
Cor
hi, try this one:
Imports System
Imports System.Windows. Forms
Imports System.Drawing. Drawing2D
Imports System.Drawing
<ToolboxBitmap( GetType(Picture Box))> _
Public Class adxPictureContr ol
Inherits PictureBox
Private _image As System.Drawing. Image
Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Public Shadows Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
If Not Value Is _image Then
If Me.DesignMode Then
MyBase.Image = Value
_image = Value
Else
Dim ea As New EventArgsImageC hanged
If Not _image Is Nothing Then
RaiseEvent ImageBeforeChan ged(Me, ea)
If ea.Cancel = True Then
Exit Property
End If
End If
MyBase.Image = Value
_image = Value
RaiseEvent ImageAfterChang ed(Me, ea)
End If
End If
End Set
End Property
End Class
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Public Property Cancel() As Boolean
Get
Return _cancel
End Get
Set(ByVal Value As Boolean)
_cancel = Value
End Set
End Property
End Class
"Cor Ligthert" wrote: me 2 ;-)
Has to do with politness, I am sorry that you did not understand it.
When the OP ask something what is for you strange because the answer is
obvious, than you can give an answer, however you can as well do what I did
and ask what he means with his question, although you know almost for sure
your answer.
When than somebody else give in a (in my opinion kind of rude way) that
answer I am not happy.
In that way the OP will probably never ask a question here again.
I can than write nothing or ask to do it not again the next time.
Clear?
Cor
Here is a control you can use:
Imports System
Imports System.Windows. Forms
Imports System.Drawing. Drawing2D
Imports System.Drawing
<ToolboxBitmap( GetType(Picture Box))> _
Public Class adxPictureContr ol
Inherits PictureBox
Private _image As System.Drawing. Image
Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
'Avi D. New York, NY 2004
Public Shadows Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
If Not Value Is _image Then
If Me.DesignMode Then
MyBase.Image = Value
_image = Value
Else
Dim ea As New EventArgsImageC hanged
If Not _image Is Nothing Then
RaiseEvent ImageBeforeChan ged(Me, ea)
If ea.Cancel = True Then
Exit Property
End If
End If
MyBase.Image = Value
_image = Value
RaiseEvent ImageAfterChang ed(Me, ea)
End If
End If
End Set
End Property
End Class
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Public Property Cancel() As Boolean
Get
Return _cancel
End Get
Set(ByVal Value As Boolean)
_cancel = Value
End Set
End Property
End Class
"Cor Ligthert" wrote: me 2 ;-)
Has to do with politness, I am sorry that you did not understand it.
When the OP ask something what is for you strange because the answer is
obvious, than you can give an answer, however you can as well do what I did
and ask what he means with his question, although you know almost for sure
your answer.
When than somebody else give in a (in my opinion kind of rude way) that
answer I am not happy.
In that way the OP will probably never ask a question here again.
I can than write nothing or ask to do it not again the next time.
Clear?
Cor
AviD, Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Rather then ImageBeforeChan ged & ImageAfterChang ed you might consider naming
the events ImageChanging & ImageChanged which is the normal convention for
..NET.
http://msdn.microsoft.com/library/de...Guidelines.asp
http://msdn.microsoft.com/library/de...Guidelines.asp
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Rather then define a class with a Cancel Property you can simply use
System.Componen tModel.CancelEv entArgs or inherit from it.
http://msdn.microsoft.com/library/de...classtopic.asp
Public Class adxPictureContr ol
Inherits PictureBox
Public Event ImageChanging As System.Componen tModel.CancelEv entHandler
Public Event ImageChanged As System.Event Handler
...
End Class
Hope this helps
Jay
"AviD" <av*@newsgroup. nospam> wrote in message
news:A1******** *************** ***********@mic rosoft.com... hi, try this one:
Imports System
Imports System.Windows. Forms
Imports System.Drawing. Drawing2D
Imports System.Drawing
<ToolboxBitmap( GetType(Picture Box))> _
Public Class adxPictureContr ol
Inherits PictureBox
Private _image As System.Drawing. Image
Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Public Shadows Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
If Not Value Is _image Then
If Me.DesignMode Then
MyBase.Image = Value
_image = Value
Else
Dim ea As New EventArgsImageC hanged
If Not _image Is Nothing Then
RaiseEvent ImageBeforeChan ged(Me, ea)
If ea.Cancel = True Then
Exit Property
End If
End If
MyBase.Image = Value
_image = Value
RaiseEvent ImageAfterChang ed(Me, ea)
End If
End If
End Set
End Property
End Class
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Public Property Cancel() As Boolean
Get
Return _cancel
End Get
Set(ByVal Value As Boolean)
_cancel = Value
End Set
End Property
End Class
"Cor Ligthert" wrote:
> me 2 ;-)
>
Has to do with politness, I am sorry that you did not understand it.
When the OP ask something what is for you strange because the answer is
obvious, than you can give an answer, however you can as well do what I
did
and ask what he means with his question, although you know almost for
sure
your answer.
When than somebody else give in a (in my opinion kind of rude way) that
answer I am not happy.
In that way the OP will probably never ask a question here again.
I can than write nothing or ask to do it not again the next time.
Clear?
Cor
Hi Jay
Advice well taken!
AviD.
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:ei******** ******@tk2msftn gp13.phx.gbl... AviD, Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Rather then ImageBeforeChan ged & ImageAfterChang ed you might consider
naming the events ImageChanging & ImageChanged which is the normal
convention for .NET.
http://msdn.microsoft.com/library/de...Guidelines.asp
http://msdn.microsoft.com/library/de...Guidelines.asp
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Rather then define a class with a Cancel Property you can simply use
System.Componen tModel.CancelEv entArgs or inherit from it.
http://msdn.microsoft.com/library/de...classtopic.asp
Public Class adxPictureContr ol
Inherits PictureBox
Public Event ImageChanging As System.Componen tModel.CancelEv entHandler
Public Event ImageChanged As System.Event Handler
...
End Class
Hope this helps
Jay
"AviD" <av*@newsgroup. nospam> wrote in message
news:A1******** *************** ***********@mic rosoft.com... hi, try this one:
Imports System
Imports System.Windows. Forms
Imports System.Drawing. Drawing2D
Imports System.Drawing
<ToolboxBitmap( GetType(Picture Box))> _
Public Class adxPictureContr ol
Inherits PictureBox
Private _image As System.Drawing. Image
Event ImageBeforeChan ged(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Event ImageAfterChang ed(ByVal sender As Object, ByVal e As
EventArgsImageC hanged)
Public Shadows Property Image() As Image
Get
Return _image
End Get
Set(ByVal Value As Image)
If Not Value Is _image Then
If Me.DesignMode Then
MyBase.Image = Value
_image = Value
Else
Dim ea As New EventArgsImageC hanged
If Not _image Is Nothing Then
RaiseEvent ImageBeforeChan ged(Me, ea)
If ea.Cancel = True Then
Exit Property
End If
End If
MyBase.Image = Value
_image = Value
RaiseEvent ImageAfterChang ed(Me, ea)
End If
End If
End Set
End Property
End Class
Public Class EventArgsImageC hanged
Inherits EventArgs
Private _cancel As Boolean = False
Public Property Cancel() As Boolean
Get
Return _cancel
End Get
Set(ByVal Value As Boolean)
_cancel = Value
End Set
End Property
End Class
"Cor Ligthert" wrote:
> me 2 ;-)
>
Has to do with politness, I am sorry that you did not understand it.
When the OP ask something what is for you strange because the answer is
obvious, than you can give an answer, however you can as well do what I
did
and ask what he means with his question, although you know almost for
sure
your answer.
When than somebody else give in a (in my opinion kind of rude way) that
answer I am not happy.
In that way the OP will probably never ask a question here again.
I can than write nothing or ask to do it not again the next time.
Clear?
Cor
The only solution I can think of, is to Inherit from a PictureBox, and
override (or shadow, for that matter) the Image property. I needed to do
that to make a PictureBox that supported "DBNull" values, and it worked
Ok... Then you can call MyBase.Image to set or get the PictureBox's real
values.
Hope this helps.
VBen.
"Jose Michael Meo R. Barrido" <mi**@rdmsinc.n et> escribió en el mensaje
news:uq******** ******@TK2MSFTN GP09.phx.gbl... Hi! Can u please tech me a way to know if the image in the picturebox has
changed? what event should i catch the chage?
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