Preventing VCL Components from updating

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4 total messages Started by Dan Fri, 23 Feb 2007 20:54

#2478

Author: Dan
Date: Fri, 23 Feb 2007 20:54

12 lines
1357 bytes

Basic question.

I have a VCL object, TStringGrid, that I want to apply a number of 
changes to, but I don't want to see the screen flicker.  Or in 
otherwords, I want all my changes made, and then the screen redrawn.

I can accomplish that to some extent by setting Visible to false and , 
doing all the updates, and then setting it to true, but that does cause 
the screen to become invisible briefly.

Is there a better way that doesn't make the component invisible, and 
thus flicker?

Re: Preventing VCL Components from updating

#2479

Author: Remy Lebeau (TeamB)
Date: Fri, 23 Feb 2007 21:17

13 lines
1273 bytes

"Dan" <Dan@do.not.spam> wrote in message
news:45df54b7$1@newsgroups.borland.com...

> Is there a better way that doesn't make the component invisible,
> and thus flicker?

Send a WM_SETREDRAW message with its wParam set to FALSE to the grid's
HWND before making the update, and then send it again with wParam set
to TRUE afterwards.


Gambit

Re: Preventing VCL Components from updating

#2480

Author: Dan
Date: Fri, 23 Feb 2007 21:53

16 lines
1356 bytes

Remy Lebeau (TeamB) wrote:
> "Dan" <Dan@do.not.spam> wrote in message
> news:45df54b7$1@newsgroups.borland.com...
> 
>> Is there a better way that doesn't make the component invisible,
>> and thus flicker?
> 
> Send a WM_SETREDRAW message with its wParam set to FALSE to the grid's
> HWND before making the update, and then send it again with wParam set
> to TRUE afterwards.
> 
> 
> Gambit
> 
> 
Thanks

Re: Preventing VCL Components from updating

#2206

Author: DreamChaser
Date: Fri, 23 Mar 2007 04:11

8 lines
1306 bytes

>>
>> Send a WM_SETREDRAW message with its wParam set to FALSE to the grid's
>> HWND before making the update, and then send it again with wParam set
>> to TRUE afterwards.
I had done this in an app and found that I needed to force a repaint 
after send the TRUE.

DC

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