Invalidate() compared to Refresh()

[SamSpade]

picDocument is a picturebox

When I do picDocument.Inv alidate() the box paints.

But if instead I do picDocument.Ref resh() the box does not paint.

What does Refresh do. I guessed it did an Invalidate and an Update.

Can someone shed some light?

Thanks

[yEaH rIgHt]

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.
" SamSpade" <st************ **@REMOVEaol.co m> wrote in message
news:O$******** ******@TK2MSFTN GP11.phx.gbl...

picDocument is a picturebox

When I do picDocument.Inv alidate() the box paints.

But if instead I do picDocument.Ref resh() the box does not paint.

What does Refresh do. I guessed it did an Invalidate and an Update.

Can someone shed some light?

Thanks

[Herfried K. Wagner [MVP]]

* "yEaH rIgHt" <nospam@haha> scripsit:

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.

What's the difference?

(I know the difference, but I want to hear it ;-))

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[SamSpade]

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.

What's the difference?

(I know the difference, but I want to hear it ;-))

I don't think the >> above answers my question but let me take a stab at
answering yours.
By paint message I think he means paint event so sending a paint message
means raising the paint event.

Telling a contoll to redraw itself might means sending an Update message.

What do you think??

I know of the WindowsAPI's Invalidate and Update.
I'd guess Refresh does them both but that does not agree with what I
observed.
What I'd like to know is:
When I does picDocument.Inv alidate() the box paints.
But if instead I do picDocument.Ref resh() the box does not paint.

[Jay B. Harlow [MVP - Outlook]]

SamSpade,
Control.Refresh - does a Control.Invalid ate immediately followed by
Control.Update.

Control.Invalid ate - invalidates a specific region of the Control (defaults
to entire client area) and causes a paint message to be sent to the control.

Control.Update - causes the Paint event to occur immediately (Windows will
normally wait until there are no other messages for the window to process,
before raising the Paint event).
Refresh can be overridden, have you overridden it to change its behavior?
The paint event of course is where all the drawing of your PictureBox
occurs. Note there is only one pending Paint event, if you call Invalidate 3
times, you will still only receive one Paint event.

Hope this helps
Jay

" SamSpade" <st************ **@REMOVEaol.co m> wrote in message
news:O$******** ******@TK2MSFTN GP11.phx.gbl...

picDocument is a picturebox

When I do picDocument.Inv alidate() the box paints.

But if instead I do picDocument.Ref resh() the box does not paint.

What does Refresh do. I guessed it did an Invalidate and an Update.

Can someone shed some light?

Thanks

[yEaH rIgHt]

>By paint message I think he means paint event so sending a paint message

means raising the paint event.
That's what I meant. It doesn't raise an paint event for you to use.
" SamSpade" <st************ **@REMOVEaol.co m> wrote in message
news:Oy******** ******@TK2MSFTN GP12.phx.gbl...

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.

What's the difference?

(I know the difference, but I want to hear it ;-))

I don't think the >> above answers my question but let me take a stab at
answering yours.
By paint message I think he means paint event so sending a paint message
means raising the paint event.

Telling a contoll to redraw itself might means sending an Update message.

What do you think??

I know of the WindowsAPI's Invalidate and Update.
I'd guess Refresh does them both but that does not agree with what I
observed.
What I'd like to know is:
When I does picDocument.Inv alidate() the box paints.
But if instead I do picDocument.Ref resh() the box does not paint.

[yEaH rIgHt]

If you know the answer then why don't you tell us, master?

"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> wrote in message
news:OT******** ******@TK2MSFTN GP11.phx.gbl...

* "yEaH rIgHt" <nospam@haha> scripsit:

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.

What's the difference?

(I know the difference, but I want to hear it ;-))

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Jay B. Harlow [MVP - Outlook]]

Yeah Right,
Are you certain?

In VS.NET 2002 & VS.NET 2003 Refresh calls Invalidate & Update methods, the
Update method sends the paint message to the control.

For details see:
http://msdn.microsoft.com/library/de...dateTopic1.asp

http://msdn.microsoft.com/library/de...pdateTopic.asp

http://msdn.microsoft.com/library/de...freshTopic.asp
Or are you using Mono? Is it different in Mono? Or are you simply stating
that Refresh does not directly send the paint message, that it sends it
indirectly via the Update?

Just curious
Jay

"yEaH rIgHt" <nospam@haha> wrote in message
news:10******** *****@corp.supe rnews.com...

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.
" SamSpade" <st************ **@REMOVEaol.co m> wrote in message
news:O$******** ******@TK2MSFTN GP11.phx.gbl...

picDocument is a picturebox

When I do picDocument.Inv alidate() the box paints.

But if instead I do picDocument.Ref resh() the box does not paint.

What does Refresh do. I guessed it did an Invalidate and an Update.

Can someone shed some light?

Thanks

[Herfried K. Wagner [MVP]]

* "yEaH rIgHt" <nospam@haha> scripsit:

If you know the answer then why don't you tell us, master?

Because Jay has already done it ;-).

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[yEaH rIgHt]

Jay, you're right. I made a stupid blunder. I had a button click event with
the ReFresh method in it but I was hitting the wrong button. I guess I
shouldn't answer questions late at night. D'OH!!!
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:eQ******** ******@TK2MSFTN GP09.phx.gbl...

Yeah Right,
Are you certain?

In VS.NET 2002 & VS.NET 2003 Refresh calls Invalidate & Update methods, the Update method sends the paint message to the control.

For details see:
http://msdn.microsoft.com/library/de...dateTopic1.asp
http://msdn.microsoft.com/library/de...pdateTopic.asp
http://msdn.microsoft.com/library/de...freshTopic.asp

Or are you using Mono? Is it different in Mono? Or are you simply stating
that Refresh does not directly send the paint message, that it sends it
indirectly via the Update?

Just curious
Jay

"yEaH rIgHt" <nospam@haha> wrote in message
news:10******** *****@corp.supe rnews.com...

Refresh doesn't send a paint message to the control. It's telling the
control to redraw itself.
" SamSpade" <st************ **@REMOVEaol.co m> wrote in message
news:O$******** ******@TK2MSFTN GP11.phx.gbl...

picDocument is a picturebox

When I do picDocument.Inv alidate() the box paints.

But if instead I do picDocument.Ref resh() the box does not paint.

What does Refresh do. I guessed it did an Invalidate and an Update.

Can someone shed some light?

Thanks