Onpaint and Invalidate question

[Colin McGuire]

Hi, I am just learning "how-to" by reading some of the existing
article solutions in this newsgroup. I happened to come across this
one. Tom Spink knows what he is talking about and I am wondering why
he has done something.

My question is how does this work

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

My understanding was that Invalidate() raises an OnPaint(..) event, so
therefore this should be recursive shouldn't it?

Thank you
Colin


From: "Tom Spink" <th**********@ntlworld.com>
References: <uY**************@TK2MSFTNGP11.phx.gbl>
Subject: Re: e.Graphics.DrawLine Method
Date: Fri, 28 Feb 2003 07:55:04 -0000
Lines: 47
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81.104.59.115
Try overriding the OnPaint event, then invalidating the form:

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

--
==============================================
Happy To Help,
Tom Spink
(th**********@ntlworld.com)
http://dotnetx.betasafe.com >> VB, VB.NET, C#, C++ Code

Please respond to the newsgroups, so all can benefit.

One day
"Steve Le Monnier" <st*********@no.spam.please.hotmail.com> wrote in message
news:uY**************@TK2MSFTNGP11.phx.gbl...

I'm using the following code to draw to horizontal lines to give an etched
effect.

private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
e.Graphics.DrawLine(SystemPens.ControlLightLight, new Point(-1,
this.panBottom.Top -1), new Point(this.Width +1, this.panBottom.Top -1));
e.Graphics.DrawLine(SystemPens.ControlDarkDark, new Point(-1,
this.panBottom.Top-2), new Point(this.Width +1, this.panBottom.Top-2));
}

This works fine until the form is resized then I end up with lines
everywhere!

Now we no longer have line controls other than using two labels how is one
to draw lines on forms and have them behave when the form is resized?

Cheers

Steve

[Brian]

Yes it is recursive. By the way, did you look at your
scrollposition ---can't de determined post? I think I found your solution.
Go take a look!
"Colin McGuire" <co***********@lycos.co.uk> wrote in message
news:ab**************************@posting.google.c om...

Hi, I am just learning "how-to" by reading some of the existing
article solutions in this newsgroup. I happened to come across this
one. Tom Spink knows what he is talking about and I am wondering why
he has done something.

My question is how does this work

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

My understanding was that Invalidate() raises an OnPaint(..) event, so
therefore this should be recursive shouldn't it?

Thank you
Colin


From: "Tom Spink" <th**********@ntlworld.com>
References: <uY**************@TK2MSFTNGP11.phx.gbl>
Subject: Re: e.Graphics.DrawLine Method
Date: Fri, 28 Feb 2003 07:55:04 -0000
Lines: 47
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1105
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1105
Message-ID: <u5**************@TK2MSFTNGP10.phx.gbl>
Newsgroups: microsoft.public.dotnet.languages.csharp,microsoft .public.dotnet.languages.v
b NNTP-Posting-Host: pc3-hart4-4-cust115.midd.cable.ntl.com
81.104.59.115
Try overriding the OnPaint event, then invalidating the form:

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

--
==============================================
Happy To Help,
Tom Spink
(th**********@ntlworld.com)
http://dotnetx.betasafe.com >> VB, VB.NET, C#, C++ Code

Please respond to the newsgroups, so all can benefit.

One day
"Steve Le Monnier" <st*********@no.spam.please.hotmail.com> wrote in message news:uY**************@TK2MSFTNGP11.phx.gbl...

I'm using the following code to draw to horizontal lines to give an etched effect.

private void Form1_Paint(object sender,

System.Windows.Forms.PaintEventArgs

e)
{
e.Graphics.DrawLine(SystemPens.ControlLightLight, new Point(-1,
this.panBottom.Top -1), new Point(this.Width +1, this.panBottom.Top -1)); e.Graphics.DrawLine(SystemPens.ControlDarkDark, new Point(-1,
this.panBottom.Top-2), new Point(this.Width +1, this.panBottom.Top-2));
}

This works fine until the form is resized then I end up with lines
everywhere!

Now we no longer have line controls other than using two labels how is one to draw lines on forms and have them behave when the form is resized?

Cheers

Steve

[Justin Weinberg]

I think what is written below would be a very, very bad thing. Where did
you see the source?
"Colin McGuire" <co***********@lycos.co.uk> wrote in message
news:ab**************************@posting.google.c om...

Hi, I am just learning "how-to" by reading some of the existing
article solutions in this newsgroup. I happened to come across this
one. Tom Spink knows what he is talking about and I am wondering why
he has done something.

My question is how does this work

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

My understanding was that Invalidate() raises an OnPaint(..) event, so
therefore this should be recursive shouldn't it?

Thank you
Colin


From: "Tom Spink" <th**********@ntlworld.com>
References: <uY**************@TK2MSFTNGP11.phx.gbl>
Subject: Re: e.Graphics.DrawLine Method
Date: Fri, 28 Feb 2003 07:55:04 -0000
Lines: 47
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1105
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1105
Message-ID: <u5**************@TK2MSFTNGP10.phx.gbl>
Newsgroups: microsoft.public.dotnet.languages.csharp,microsoft .public.dotnet.languages.v
b NNTP-Posting-Host: pc3-hart4-4-cust115.midd.cable.ntl.com
81.104.59.115
Try overriding the OnPaint event, then invalidating the form:

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

--
==============================================
Happy To Help,
Tom Spink
(th**********@ntlworld.com)
http://dotnetx.betasafe.com >> VB, VB.NET, C#, C++ Code

Please respond to the newsgroups, so all can benefit.

One day
"Steve Le Monnier" <st*********@no.spam.please.hotmail.com> wrote in message news:uY**************@TK2MSFTNGP11.phx.gbl...

I'm using the following code to draw to horizontal lines to give an etched effect.

private void Form1_Paint(object sender,

System.Windows.Forms.PaintEventArgs

e)
{
e.Graphics.DrawLine(SystemPens.ControlLightLight, new Point(-1,
this.panBottom.Top -1), new Point(this.Width +1, this.panBottom.Top -1)); e.Graphics.DrawLine(SystemPens.ControlDarkDark, new Point(-1,
this.panBottom.Top-2), new Point(this.Width +1, this.panBottom.Top-2));
}

This works fine until the form is resized then I end up with lines
everywhere!

Now we no longer have line controls other than using two labels how is one to draw lines on forms and have them behave when the form is resized?

Cheers

Steve

[Colin McGuire]

Google groups search on "e.Graphics.DrawLine Method", the top article.

"Justin Weinberg" <jw*******@bravopos.com> wrote in message
news:O4**************@TK2MSFTNGP12.phx.gbl...

I think what is written below would be a very, very bad thing. Where did
you see the source?
"Colin McGuire" <co***********@lycos.co.uk> wrote in message
news:ab**************************@posting.google.c om...

Hi, I am just learning "how-to" by reading some of the existing
article solutions in this newsgroup. I happened to come across this
one. Tom Spink knows what he is talking about and I am wondering why
he has done something.

My question is how does this work

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

My understanding was that Invalidate() raises an OnPaint(..) event, so
therefore this should be recursive shouldn't it?

Thank you
Colin


From: "Tom Spink" <th**********@ntlworld.com>
References: <uY**************@TK2MSFTNGP11.phx.gbl>
Subject: Re: e.Graphics.DrawLine Method
Date: Fri, 28 Feb 2003 07:55:04 -0000
Lines: 47
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1105
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1105
Message-ID: <u5**************@TK2MSFTNGP10.phx.gbl>
Newsgroups:

microsoft.public.dotnet.languages.csharp,microsoft .public.dotnet.languages.v b

NNTP-Posting-Host: pc3-hart4-4-cust115.midd.cable.ntl.com
81.104.59.115
Try overriding the OnPaint event, then invalidating the form:

<pseudo>
Function To Override OnPaint(...)
Call Base Class OnPaint(...)
Me.Invalidate()
End Function
</pseudo>

--
==============================================
Happy To Help,
Tom Spink
(th**********@ntlworld.com)
http://dotnetx.betasafe.com >> VB, VB.NET, C#, C++ Code

Please respond to the newsgroups, so all can benefit.

One day
"Steve Le Monnier" <st*********@no.spam.please.hotmail.com> wrote in

message

news:uY**************@TK2MSFTNGP11.phx.gbl...

I'm using the following code to draw to horizontal lines to give an etched effect.

private void Form1_Paint(object sender,

System.Windows.Forms.PaintEventArgs

e)
{
e.Graphics.DrawLine(SystemPens.ControlLightLight, new Point(-1,
this.panBottom.Top -1), new Point(this.Width +1, this.panBottom.Top -1)); e.Graphics.DrawLine(SystemPens.ControlDarkDark, new Point(-1,
this.panBottom.Top-2), new Point(this.Width +1, this.panBottom.Top-2)); }

This works fine until the form is resized then I end up with lines
everywhere!

Now we no longer have line controls other than using two labels how is one to draw lines on forms and have them behave when the form is resized?

Cheers

Steve