Resizing a form

[Søren Reinke]

Hi there

I have a little problem.

How do i make sure that a graph is not redrawn while the form with the graph
is being resized ?
I have tried to add a mouse up/down event handler on the form1, but it
dosn't get called when resizing :(

I would like to be able to resize my form, but also make sure the graph is
only redrawn when the user is not resizing any more.

Hope my question make sense :)

--
Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net.
Current issue Diving in North America, 99 pages.
Download it in PDF

[Frans Bouma [C# MVP]]

Re: Resizing a form

Søren Reinke wrote:[color=blue]
> Hi there
>
> I have a little problem.
>
> How do i make sure that a graph is not redrawn while the form with the graph
> is being resized ?
> I have tried to add a mouse up/down event handler on the form1, but it
> dosn't get called when resizing :(
>
> I would like to be able to resize my form, but also make sure the graph is
> only redrawn when the user is not resizing any more.
>
> Hope my question make sense :)[/color]

First, override OnResize() and the first time you enter that method,
you set a flag. You also call this.SuspendLay out();, if the flag was
wasn't set already.

then, you override OnSizeChanged. In there, you reset the flag and call
this.ResumeLayo ut(false);. Then draw your graph.

Frans

--
------------------------------------------------------------------------
Get LLBLGen Pro, productive O/R mapping for .NET: http://www.llblgen.com
My .NET blog: http://weblogs.asp.net/fbouma
Microsoft MVP (C#)
------------------------------------------------------------------------

[Alan Pretre]

Re: Resizing a form

"Søren Reinke" <soren@reinke.f jernmig.dk> wrote in message
news:d5sptl$13q a$1@newsbin.cyb ercity.dk...[color=blue]
> How do i make sure that a graph is not redrawn while the form with the
> graph is being resized ?
>
> I would like to be able to resize my form, but also make sure the graph is
> only redrawn when the user is not resizing any more.[/color]

It depends on the control. Sometimes there is a BeginUpdate/EndUpdate
mechanism, other times you have to call the Win32 ValidateRect() function,
passing in the control's window handle and client area.

-- Alan

[Søren Reinke]

Re: Resizing a form

>>[color=blue][color=green]
>> I would like to be able to resize my form, but also make sure the graph
>> is only redrawn when the user is not resizing any more.
>>
>> Hope my question make sense :)[/color]
>
> First, override OnResize() and the first time you enter that method, you
> set a flag. You also call this.SuspendLay out();, if the flag was wasn't
> set already.
>
> then, you override OnSizeChanged. In there, you reset the flag and call
> this.ResumeLayo ut(false);. Then draw your graph.
>
> Frans[/color]


Hi Frans

Thanks for the tip, i'll try it :)

--
Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net.
Current issue Diving in North America, 99 pages.
Download it in PDF

[Rachel Suddeth]

Re: Resizing a form

I have a similar problem, but I don't see how this will work. Both Resize
and SizeChanged events get called multiple times during a single resizing
drag.

-Rachel

"Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
news:%23BurXniV FHA.3076@TK2MSF TNGP12.phx.gbl. ..[color=blue]
> Søren Reinke wrote:[color=green]
> > Hi there
> >
> > I have a little problem.
> >
> > How do i make sure that a graph is not redrawn while the form with the[/color][/color]
graph[color=blue][color=green]
> > is being resized ?
> > I have tried to add a mouse up/down event handler on the form1, but it
> > dosn't get called when resizing :(
> >
> > I would like to be able to resize my form, but also make sure the graph[/color][/color]
is[color=blue][color=green]
> > only redrawn when the user is not resizing any more.
> >
> > Hope my question make sense :)[/color]
>
> First, override OnResize() and the first time you enter that method,
> you set a flag. You also call this.SuspendLay out();, if the flag was
> wasn't set already.
>
> then, you override OnSizeChanged. In there, you reset the flag and call
> this.ResumeLayo ut(false);. Then draw your graph.
>
> Frans
>
> --
> ------------------------------------------------------------------------
> Get LLBLGen Pro, productive O/R mapping for .NET: http://www.llblgen.com
> My .NET blog: http://weblogs.asp.net/fbouma
> Microsoft MVP (C#)
> ------------------------------------------------------------------------[/color]

[Frans Bouma [C# MVP]]

Re: Resizing a form

Rachel Suddeth wrote:[color=blue]
> I have a similar problem, but I don't see how this will work. Both Resize
> and SizeChanged events get called multiple times during a single resizing
> drag.[/color]

Hmm. If SizeChanged is called multiple times, it indeed has a problem.
It then gets hacky, you then have to set a timer or something :X...

FB
[color=blue]
>
> -Rachel
>
> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
> news:%23BurXniV FHA.3076@TK2MSF TNGP12.phx.gbl. ..
>[color=green]
>>Søren Reinke wrote:
>>[color=darkred]
>>>Hi there
>>>
>>>I have a little problem.
>>>
>>>How do i make sure that a graph is not redrawn while the form with the[/color][/color]
>
> graph
>[color=green][color=darkred]
>>>is being resized ?
>>>I have tried to add a mouse up/down event handler on the form1, but it
>>>dosn't get called when resizing :(
>>>
>>>I would like to be able to resize my form, but also make sure the graph[/color][/color]
>
> is
>[color=green][color=darkred]
>>>only redrawn when the user is not resizing any more.
>>>
>>>Hope my question make sense :)[/color]
>>
>>First, override OnResize() and the first time you enter that method,
>>you set a flag. You also call this.SuspendLay out();, if the flag was
>>wasn't set already.
>>
>>then, you override OnSizeChanged. In there, you reset the flag and call
>>this.ResumeLa yout(false);. Then draw your graph.[/color][/color]


--
------------------------------------------------------------------------
Get LLBLGen Pro, productive O/R mapping for .NET: http://www.llblgen.com
My .NET blog: http://weblogs.asp.net/fbouma
Microsoft MVP (C#)
------------------------------------------------------------------------

[Mick Doherty]

Re: Resizing a form

The following link gives a VB solution, but it should be simple enough to
convert to C#

http://groups.google.co.uk/group/microsoft.public.dotnet.framework.windowsforms.controls/browse_thread/thread/7d7253499bc890b5/64a09c0cf8b9d9ca?q=resizing+help+group:microsoft.public.dotnet.framework.windowsforms.controls&rnum=1&hl=en#64a09c0cf8b9d9ca

--
Mick Doherty

http://dotnetrix.co.uk/nothing.html

"Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
news:%23MbnG4sV FHA.2196@TK2MSF TNGP09.phx.gbl. ..[color=blue]
> Rachel Suddeth wrote:[color=green]
>> I have a similar problem, but I don't see how this will work. Both Resize
>> and SizeChanged events get called multiple times during a single resizing
>> drag.[/color]
>
> Hmm. If SizeChanged is called multiple times, it indeed has a problem. It
> then gets hacky, you then have to set a timer or something :X...
>
> FB
>[color=green]
>>
>> -Rachel
>>
>> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
>> news:%23BurXniV FHA.3076@TK2MSF TNGP12.phx.gbl. ..
>>[color=darkred]
>>>Søren Reinke wrote:
>>>
>>>>Hi there
>>>>
>>>>I have a little problem.
>>>>
>>>>How do i make sure that a graph is not redrawn while the form with the[/color]
>>
>> graph
>>[color=darkred]
>>>>is being resized ?
>>>>I have tried to add a mouse up/down event handler on the form1, but it
>>>>dosn't get called when resizing :(
>>>>
>>>>I would like to be able to resize my form, but also make sure the graph[/color]
>>
>> is
>>[color=darkred]
>>>>only redrawn when the user is not resizing any more.
>>>>
>>>>Hope my question make sense :)
>>>
>>>First, override OnResize() and the first time you enter that method,
>>>you set a flag. You also call this.SuspendLay out();, if the flag was
>>>wasn't set already.
>>>
>>>then, you override OnSizeChanged. In there, you reset the flag and call
>>>this.ResumeL ayout(false);. Then draw your graph.[/color][/color]
>
>
> --
> ------------------------------------------------------------------------
> Get LLBLGen Pro, productive O/R mapping for .NET: http://www.llblgen.com
> My .NET blog: http://weblogs.asp.net/fbouma
> Microsoft MVP (C#)
> ------------------------------------------------------------------------[/color]

[Rachel Suddeth]

Re: Resizing a form

Thanks, Mick, looks like that should work.
BTW, where do you get the constants from (for Windows messages)? You pull
them from a C++ header file?

-Rachel

"Mick Doherty"
<EXCHANGE#WITH@ AND.REMOVE.SQUA REBRACKETS.[mdaudi100#ntlwo rld.com]> wrote in
message news:egXPlVtVFH A.3636@TK2MSFTN GP14.phx.gbl...[color=blue]
> The following link gives a VB solution, but it should be simple enough to
> convert to C#
>
>[/color]
http://groups.google.co.uk/group/mic...a09c0cf8b9d9ca[color=blue]
>
> --
> Mick Doherty
> http://dotnetrix.co.uk/nothing.html
>
>
> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
> news:%23MbnG4sV FHA.2196@TK2MSF TNGP09.phx.gbl. ..[color=green]
> > Rachel Suddeth wrote:[color=darkred]
> >> I have a similar problem, but I don't see how this will work. Both[/color][/color][/color]
Resize[color=blue][color=green][color=darkred]
> >> and SizeChanged events get called multiple times during a single[/color][/color][/color]
resizing[color=blue][color=green][color=darkred]
> >> drag.[/color]
> >
> > Hmm. If SizeChanged is called multiple times, it indeed has a problem.[/color][/color]
It[color=blue][color=green]
> > then gets hacky, you then have to set a timer or something :X...
> >
> > FB
> >[color=darkred]
> >>
> >> -Rachel
> >>
> >> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in[/color][/color][/color]
message[color=blue][color=green][color=darkred]
> >> news:%23BurXniV FHA.3076@TK2MSF TNGP12.phx.gbl. ..
> >>
> >>>Søren Reinke wrote:
> >>>
> >>>>Hi there
> >>>>
> >>>>I have a little problem.
> >>>>
> >>>>How do i make sure that a graph is not redrawn while the form with the
> >>
> >> graph
> >>
> >>>>is being resized ?
> >>>>I have tried to add a mouse up/down event handler on the form1, but it
> >>>>dosn't get called when resizing :(
> >>>>
> >>>>I would like to be able to resize my form, but also make sure the[/color][/color][/color]
graph[color=blue][color=green][color=darkred]
> >>
> >> is
> >>
> >>>>only redrawn when the user is not resizing any more.
> >>>>
> >>>>Hope my question make sense :)
> >>>
> >>>First, override OnResize() and the first time you enter that method,
> >>>you set a flag. You also call this.SuspendLay out();, if the flag was
> >>>wasn't set already.
> >>>
> >>>then, you override OnSizeChanged. In there, you reset the flag and call
> >>>this.ResumeL ayout(false);. Then draw your graph.[/color]
> >
> >
> > --
> > ------------------------------------------------------------------------
> > Get LLBLGen Pro, productive O/R mapping for .NET: http://www.llblgen.com
> > My .NET blog: http://weblogs.asp.net/fbouma
> > Microsoft MVP (C#)
> > ------------------------------------------------------------------------[/color]
>
>[/color]

[Mick Doherty]

Re: Resizing a form

Depends on my mood. Sometimes I look them up (winuser.h in this case),
sometimes I google and sometimes I just put Console.WriteLi ne(m.ToString() );
in the WndProc() method. Usually the latter since I'm often checking to see
what messages are being sent. Then it's off to the MSDN documentation to
find out what info I can read/change for the message.

--
Mick Doherty

http://dotnetrix.co.uk/nothing.html

"Rachel Suddeth" <rachel@bldhoun d.com> wrote in message
news:OSqy1avVFH A.3760@TK2MSFTN GP15.phx.gbl...[color=blue]
> Thanks, Mick, looks like that should work.
> BTW, where do you get the constants from (for Windows messages)? You pull
> them from a C++ header file?
>
> -Rachel
>
> "Mick Doherty"
> <EXCHANGE#WITH@ AND.REMOVE.SQUA REBRACKETS.[mdaudi100#ntlwo rld.com]> wrote
> in
> message news:egXPlVtVFH A.3636@TK2MSFTN GP14.phx.gbl...[color=green]
>> The following link gives a VB solution, but it should be simple enough to
>> convert to C#
>>
>>[/color]
> http://groups.google.co.uk/group/mic...a09c0cf8b9d9ca[color=green]
>>
>> --
>> Mick Doherty
>> http://dotnetrix.co.uk/nothing.html
>>
>>
>> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in message
>> news:%23MbnG4sV FHA.2196@TK2MSF TNGP09.phx.gbl. ..[color=darkred]
>> > Rachel Suddeth wrote:
>> >> I have a similar problem, but I don't see how this will work. Both[/color][/color]
> Resize[color=green][color=darkred]
>> >> and SizeChanged events get called multiple times during a single[/color][/color]
> resizing[color=green][color=darkred]
>> >> drag.
>> >
>> > Hmm. If SizeChanged is called multiple times, it indeed has a problem.[/color][/color]
> It[color=green][color=darkred]
>> > then gets hacky, you then have to set a timer or something :X...
>> >
>> > FB
>> >
>> >>
>> >> -Rachel
>> >>
>> >> "Frans Bouma [C# MVP]" <perseus.usenet NOSPAM@xs4all.n l> wrote in[/color][/color]
> message[color=green][color=darkred]
>> >> news:%23BurXniV FHA.3076@TK2MSF TNGP12.phx.gbl. ..
>> >>
>> >>>Søren Reinke wrote:
>> >>>
>> >>>>Hi there
>> >>>>
>> >>>>I have a little problem.
>> >>>>
>> >>>>How do i make sure that a graph is not redrawn while the form with
>> >>>>the
>> >>
>> >> graph
>> >>
>> >>>>is being resized ?
>> >>>>I have tried to add a mouse up/down event handler on the form1, but
>> >>>>it
>> >>>>dosn't get called when resizing :(
>> >>>>
>> >>>>I would like to be able to resize my form, but also make sure the[/color][/color]
> graph[color=green][color=darkred]
>> >>
>> >> is
>> >>
>> >>>>only redrawn when the user is not resizing any more.
>> >>>>
>> >>>>Hope my question make sense :)
>> >>>
>> >>>First, override OnResize() and the first time you enter that method,
>> >>>you set a flag. You also call this.SuspendLay out();, if the flag was
>> >>>wasn't set already.
>> >>>
>> >>>then, you override OnSizeChanged. In there, you reset the flag and
>> >>>call
>> >>>this.ResumeL ayout(false);. Then draw your graph.
>> >
>> >
>> > --
>> > ------------------------------------------------------------------------
>> > Get LLBLGen Pro, productive O/R mapping for .NET:
>> > http://www.llblgen.com
>> > My .NET blog: http://weblogs.asp.net/fbouma
>> > Microsoft MVP (C#)
>> > ------------------------------------------------------------------------[/color]
>>
>>[/color]
>
>[/color]

[Rachel Suddeth]

Re: Resizing a form

All right, I don't know VB, and I've never needed to do masking with C#, so
I have a couple questions about how to translate the WndProc in your
example. I think the "Static Sizemode" inside the method would have to be
replaces by a class level variable in C#? Also not quite sure about the
statement to set SizeMode?

----
private bool bSizeMode = false;
protected override void WndProc(ref Message m)
{
switch ( m.Msg )
{
case WM_SIZING:
// Resize event already provided
break;
case WM_SYSCOMMAND:
bSizeMode = ((m.WParam.ToIn t32() & 0xFFF0) == SC_SIZE);
break;
case WM_ENTERSIZEMOV E:
if ( bSizeMode )
{
OnBeginResize(E ventArgs.Empty) ;
}
break;
case WM_EXITSIZEMOVE :
{
if ( bSizeMode )
{
OnEndResize(Eve ntArgs.Empty);
}
break;
}

} // end switch
base.WndProc (ref m);
}
----

Here is the VB code "copied" above
------
Protected Overrides Sub WndProc(ByRef m As System.Windows. Forms.Message)
Static SizeMode As Boolean = False
Select Case m.Msg
Case WM_SIZING
'Already have a Resize Method
Case WM_SYSCOMMAND
SizeMode = ((m.WParam.ToIn t32 And &HFFF0) = SC_SIZE)
Case WM_ENTERSIZEMOV E
If SizeMode Then
OnBeginResize(E ventArgs.Empty)
End If
Case WM_EXITSIZEMOVE
If SizeMode Then
OnEndResize(Eve ntArgs.Empty)
End If
Case Else
End Select
MyBase.WndProc( m)
End Sub

---


Thanks,

Rachel



"Mick Doherty"
<EXCHANGE#WITH@ AND.REMOVE.SQUA REBRACKETS.[mdaudi100#ntlwo rld.com]> wrote in
message news:egXPlVtVFH A.3636@TK2MSFTN GP14.phx.gbl...[color=blue]
> The following link gives a VB solution, but it should be simple enough to
> convert to C#
>
>[/color]
http://groups.google.co.uk/group/mic...a09c0cf8b9d9ca[color=blue]
>
> --
> Mick Doherty
> http://dotnetrix.co.uk/nothing.html
>
>[/color]

[Rachel Suddeth]

Re: Resizing a form

Nevermind, it's working perfectly so it must be right :-)
Here is the whole business in C#, in case that helps anyone...

---
// Variables having to do with the resizing code follow
protected bool bSizeMode = false;

/// <summary>
/// Windows Constants for WndProc call in BeginResize/EndResize events
/// </summary>
protected const int WM_SIZING = 0x214,
WM_ENTERSIZEMOV E = 0x231,
WM_EXITSIZEMOVE = 0x232,
WM_SYSCOMMAND = 0x112,
SC_SIZE = 0xF000;

/// <summary>
/// Fires once at the beginning of a resizing drag.
/// </summary>
public event EventHandler BeginResize;

/// <summary>
/// Fires once at the end of a resizing drag.
/// </summary>
public event EventHandler EndResize;
/// <summary>
/// Process Windows messages (in this case to provide Begin/EndResize events
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
switch ( m.Msg )
{
case WM_SIZING:
// Resize event already provided
break;
case WM_SYSCOMMAND:
bSizeMode = ((m.WParam.ToIn t32() & 0xFFF0) == SC_SIZE);
break;
case WM_ENTERSIZEMOV E:
if ( bSizeMode )
{
OnBeginResize(E ventArgs.Empty) ;
}
break;
case WM_EXITSIZEMOVE :
{
if ( bSizeMode )
{
OnEndResize(Eve ntArgs.Empty);
}
break;
}

} // end switch
base.WndProc (ref m);
}


/// <summary>
/// Raise BeginResize event
/// </summary>
/// <param name="e"></param>
protected virtual void OnBeginResize(S ystem.EventArgs e)
{
if ( BeginResize != null )
BeginResize(thi s, e);
}

/// <summary>
/// Raise EndResize event
/// </summary>
/// <param name="e"></param>
protected virtual void OnEndResize(Sys tem.EventArgs e)
{
if ( EndResize != null )
EndResize(this, e);
}
---

[Mick Doherty]

Re: Resizing a form

You're right that VB's local Static variable must be declared as a Class
level variable in C#.

....and the translation looks good to me :-)

--
Mick Doherty

http://dotnetrix.co.uk/nothing.html

"Rachel Suddeth" <rachel@bldhoun d.com> wrote in message
news:edDrXywVFH A.616@TK2MSFTNG P12.phx.gbl...[color=blue]
> Nevermind, it's working perfectly so it must be right :-)
> Here is the whole business in C#, in case that helps anyone...
>
> ---
> // Variables having to do with the resizing code follow
> protected bool bSizeMode = false;
>
> /// <summary>
> /// Windows Constants for WndProc call in BeginResize/EndResize events
> /// </summary>
> protected const int WM_SIZING = 0x214,
> WM_ENTERSIZEMOV E = 0x231,
> WM_EXITSIZEMOVE = 0x232,
> WM_SYSCOMMAND = 0x112,
> SC_SIZE = 0xF000;
>
> /// <summary>
> /// Fires once at the beginning of a resizing drag.
> /// </summary>
> public event EventHandler BeginResize;
>
> /// <summary>
> /// Fires once at the end of a resizing drag.
> /// </summary>
> public event EventHandler EndResize;
> /// <summary>
> /// Process Windows messages (in this case to provide Begin/EndResize
> events
> /// </summary>
> /// <param name="m"></param>
> protected override void WndProc(ref Message m)
> {
> switch ( m.Msg )
> {
> case WM_SIZING:
> // Resize event already provided
> break;
> case WM_SYSCOMMAND:
> bSizeMode = ((m.WParam.ToIn t32() & 0xFFF0) == SC_SIZE);
> break;
> case WM_ENTERSIZEMOV E:
> if ( bSizeMode )
> {
> OnBeginResize(E ventArgs.Empty) ;
> }
> break;
> case WM_EXITSIZEMOVE :
> {
> if ( bSizeMode )
> {
> OnEndResize(Eve ntArgs.Empty);
> }
> break;
> }
>
> } // end switch
> base.WndProc (ref m);
> }
>
>
> /// <summary>
> /// Raise BeginResize event
> /// </summary>
> /// <param name="e"></param>
> protected virtual void OnBeginResize(S ystem.EventArgs e)
> {
> if ( BeginResize != null )
> BeginResize(thi s, e);
> }
>
> /// <summary>
> /// Raise EndResize event
> /// </summary>
> /// <param name="e"></param>
> protected virtual void OnEndResize(Sys tem.EventArgs e)
> {
> if ( EndResize != null )
> EndResize(this, e);
> }
> ---
>
>[/color]

[Søren Reinke]

Re: Resizing a form

> Here is the whole business in C#, in case that helps anyone...[color=blue]
>
> ---[/color]

Thanks Rachel

I'll try to implement it soon.

--
Søren Reinke
www.Xray-Mag.com/ - Your free diving magazin on the net.
Current issue Diving in North America, 99 pages.
Download it in PDF