Sizechanged event question...

[johnb41]

I have a Picturebox that has an image displayed inside. Through code,
I was able to have the "whole image" display in it without distortion.
(Like a "Fit All" in most any image viewer program)

Now, when the Picturebox gets resized by the user, I want the image to
recalculate and display as "Fit All" again.

So I have code in my SizeChanged event of the picturebox. When the
"size changed", it does it's calculation, and displays properly.

It works, but there is a problem: If the user drags the Picturebox
window larger or smaller, the SizeChanged event fires many times per
second. This causes alot of sluggishness in the app when trying to
display the image.

Is there anyway that i can have the SizeChanged event fire ONCE when
i'm done resizing the picturebox?

(By the way, the picturebox gets resized indirectly. It's dock is set
to Fill. When the interface "Next" to it gets resized, the Picturebox
naturally will resize accordingly)

Thanks for all your help!

John

[Herfried K. Wagner [MVP]]

Addendum:

\\\
Private m_Image As Image
Private m_Redraw As Boolean = True

Private Sub Form1_Load( _
ByVal sender As Object, _
ByVal e As EventArgs _
) Handles MyBase.Load
m_Image = Image.FromFile( "C:\WINDOWS\Ang ler.bmp")
End Sub

Protected Overrides Sub WndProc( _
ByRef m As Message _
)
Const WM_ENTERSIZEMOV E As Int32 = &H231
Const WM_EXITSIZEMOVE As Int32 = &H232
Select Case m.Msg
Case WM_ENTERSIZEMOV E
m_Redraw = False
Case WM_EXITSIZEMOVE
m_Redraw = True
Me.Panel1.Inval idate()
End Select
MyBase.WndProc( m)
End Sub

Private Sub Panel1_Paint( _
ByVal sender As Object, _
ByVal e As PaintEventArgs _
) Handles Panel1.Paint
If m_Redraw Then
e.Graphics.Draw Image( _
m_Image, _
0, 0, _
Me.Panel1.Clien tSize.Width, Me.Panel1.Clien tSize.Height _
)
End If
End Sub
///

However, this solution would prevent the panel from redrawing if the window
is dragged by the mouse.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Cor Ligthert]

Herfried,

The main problem is a
dockable window (thanks to dotnetbar (www.devcomponents.com)).

The rest of the solutions where already given (I think mine is nicer), do
you know something about this control and to stop actions using this while
resizing.

Cor

[Herfried K. Wagner [MVP]]

"Cor Ligthert" <no************ @planet.nl> schrieb:

\\\
Public SwMoving As Boolean
Private Sub Panel1_SizeChan ged(ByVal sender As Object, _
ByVal e As System.EventArg s) Handles Panel1.SizeChan ged
SwMoving = True
End Sub
Protected Overrides Sub WndProc(ByRef m As Message)
If m.Msg = &HA0 Then 'is up

'&HA0' is 'WM_NCMOUSEMOVE '! In addition to that, note that the user can
change the size of a window using the keyboard (Alt+Space -> "Resize" ->
arrow keys), which won't fire non-client mouse events. All together I don't
see the benefits of your solution.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Cor Ligthert]

Herfried,

In addition to that, note that the user can change the size of a window
using the keyboard (Alt+Space -> "Resize" ->

A good addition. However for that can be tested in this procedure probably
just keyup &H291 with orelse (I did not test it).

I could not find all those shortcuts from C++ on Google, however I have now
copied a page from Bob Powell where it is was in, therefore I have them now
saved in my HKW system.

I thought yesterday it would be a nice extension if somebody like Herfried
makes a nice dll so that we can get those in the same way as all other
enumerations.

When you need that information from Bob Powell to make this than I can sent
them you by mail. (Before you say it, yes I can make it myself as well
however it looks so nice as a link to your page)

The Herfried.K.Wagn er namespace extension to the framework.

:-)

Cor

[Herfried K. Wagner [MVP]]

Cor,

"Cor Ligthert" <no************ @planet.nl> schrieb:

I thought yesterday it would be a nice extension if somebody like Herfried
makes a nice dll so that we can get those in the same way as all other
enumerations.

Untested:

A Win32 Library for .NET
<URL:http://www.codeproject .com/csharp/win32.asp>

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Cor Ligthert]

Herfried,

I will have a look at it, (as you know, do I hate sites which wants my
emailadres, although I know from you that this one is harmless)

Thanks,

Cor

[Herfried K. Wagner [MVP]]

Cor,

"Cor Ligthert" <no************ @planet.nl> schrieb:

I will have a look at it, (as you know, do I hate sites which wants my
emailadres, although I know from you that this one is harmless)

Yeah, I hate them too because I have to lookup my password every time I log
in.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[johnb41]

Sorry I couldn't try your suggestions out until now. ... and thanks
for the continued help with this! Unfortunately the dotnetbar
"dockable window" does not have a splitter that has events. No
splitter at all that I can see. It's probably using one in the
background, but I have no idea how to access it.

I think i'm just going to lay this issue to rest. I will not bother
having an instantly re-drawable picturebox/panel. Thanks again for all
your help!!!

John

[johnb41]

Herfried,

I tried your code, but in my app it produced some side effect errors
that I could not figure out. As I wrote to Cor above, I decided to
just give up on this effect. But at least this thread was not for
nothing... it does have some valuable code for having the SizeChanged
event fire once if the "form" itself is resized.

Thanks!
John