BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Help! ListView is flickering          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message David Guest Posted: Mon Apr 12, 2004 2:30 pm    Post subject: Help! ListView is flickering Hello. I have a listview on my form and a timer. The timer update the captions of the items in the listview each second. each time the listview items changes, it redraw itself (the entire listview) which cause flickering... is there a way to avoid it? Thanks in advance, David Back to top Simon D Guest Posted: Mon Apr 12, 2004 3:41 pm    Post subject: Re: Help! ListView is flickering "David" <virtek1 (AT) hotmail (DOT) com> wrote Quote: Hello. I have a listview on my form and a timer. The timer update the captions of the items in the listview each second. each time the listview items changes, it redraw itself (the entire listview) which cause flickering... is there a way to avoid it? Thanks in advance, David Are you using ListView->Items->BeginUpdate(); and ListView->Items->EndUpdate(); ?? Simon. Back to top Remy Lebeau (TeamB) Guest Posted: Mon Apr 12, 2004 4:57 pm    Post subject: Re: Help! ListView is flickering "David" <virtek1 (AT) hotmail (DOT) com> wrote Quote: I have a listview on my form and a timer. The timer update the captions of the items in the listview each second. each time the listview items changes, it redraw itself (the entire listview) which cause flickering... is there a way to avoid it? Please show your actual code. Gambit Back to top David Guest Posted: Mon Apr 12, 2004 9:27 pm    Post subject: Re: Help! ListView is flickering I've manage to partially get rid of the flickering. Simon, yes, i did use it but for vain somewhat. Remy, I've added the LockWindowUpdate() procedure, by following: void __fastcall TForm1::Timer1Timer(TObject *Sender) { ListView1->BeginUpdate(); LockWindowUpdate(ListView1->Handle); .......Doing some items and sub-items updates....... LockWindowUpdate(NULL); ListView1->EndUpdate(); } Now the header of the vsReport property never flicker, but the listview body flicker, but rarely. The timer interval is 1000 if it says something... Thanks, David "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> ëúá áäåãòä:407acb9d$3 (AT) newsgroups (DOT) borland.com... Quote: "David" <virtek1 (AT) hotmail (DOT) com> wrote in message news:407aa813$2 (AT) newsgroups (DOT) borland.com... I have a listview on my form and a timer. The timer update the captions of the items in the listview each second. each time the listview items changes, it redraw itself (the entire listview) which cause flickering... is there a way to avoid it? Please show your actual code. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Apr 12, 2004 9:33 pm    Post subject: Re: Help! ListView is flickering "David" <virtek1 (AT) hotmail (DOT) com> wrote Quote: ListView1->BeginUpdate(); Is this your ACTUAL code copy/pasted as-is? I suspect not, considering that TListView doesn't have Begin/EndUpdate() methods at all. They are methods of the Items property instead: ListView1->Items->BeginUpdate(); ... ListView1->Items->EndUpdate(); Quote: LockWindowUpdate(ListView1->Handle); You do not need to call LockWindowUpdate(), nor should you b doing so. BeginUpdate() already handles disabling screen updates, you don't have to do anything else for it. Quote: ......Doing some items and sub-items updates....... Please show that code. Gambit Back to top Mark Jacobs Guest Posted: Tue Apr 13, 2004 10:10 am    Post subject: Re: Help! ListView is flickering You might also try making your form Form1 property DoubleBuffered=true; (BCB5 onwards) -- Mark Jacobs DK Computing http://www.dkcomputing.co.uk [email]markj (AT) criticalremovethisspuriousantispamstuff (DOT) co.uk[/email] "David" <virtek1 (AT) hotmail (DOT) com> wrote Quote: Hello. I have a listview on my form and a timer. The timer update the captions of the items in the listview each second. each time the listview items changes, it redraw itself (the entire listview) which cause flickering... is there a way to avoid it? Thanks in advance, David Back to top David Guest Posted: Fri Apr 16, 2004 11:27 am    Post subject: Re: Help! ListView is flickering I've forgot to mention that the listview a little diffrent, it's from TMS, and so one can do ListView1->BeginUpdate(); But I've changed it to ListView1->Items->BeginUpdate(), EndUpdate() and the flickring was gone! Thanks Remy. "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> ëúá áäåãòä:407b0c58 (AT) newsgroups (DOT) borland.com... Quote: "David" <virtek1 (AT) hotmail (DOT) com> wrote in message news:407b09ab (AT) newsgroups (DOT) borland.com... ListView1->BeginUpdate(); Is this your ACTUAL code copy/pasted as-is? I suspect not, considering that TListView doesn't have Begin/EndUpdate() methods at all. They are methods of the Items property instead: ListView1->Items->BeginUpdate(); ... ListView1->Items->EndUpdate(); LockWindowUpdate(ListView1->Handle); You do not need to call LockWindowUpdate(), nor should you b doing so. BeginUpdate() already handles disabling screen updates, you don't have to do anything else for it. ......Doing some items and sub-items updates....... Please show that code. Gambit Back to top Corey Murtagh Guest Posted: Wed Apr 28, 2004 2:59 am    Post subject: Re: Help! ListView is flickering Mark Jacobs wrote: Quote: You might also try making your form Form1 property DoubleBuffered=true; (BCB5 onwards) BCB4 has a non-published DoubleBuffered property. Another angle no-one seems to have mentioned, which certainly works for BCB4, is to set the csOpaque flag in ControlStyle. This has the effect, in TWinControl descendants that don't mess with the CMInvalidate handler, of preventing the call to InvalidateRect() from erasing the existing background. YMMV of course... it all depends on what you're doing. -- Corey Murtagh The Electric Monk "Quidquid latine dictum sit, altum viditur!" 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