Re: Why does the GridView fire the Draw Event continuously ?

[Benoît Minisini <benoit.minisini@xxxxxxxxxxxxxxxx>]

Le 19/11/2024 à 20:09, Claus Dietrich a écrit :
> Hi
>
> Today I implemented A GridView in one of my apps and found that it 
> caused a CPU load of up to 80%. The App slowed down to an unacceptable 
> level. This mini program with a GridView demonstrates it:
>
> Public Sub Form_Open()
>
>      GridView1.Columns.Count = 1
>      GridView1.Rows.count = 3
>
> End
>
> Public Sub GridView1_Draw(X As Integer, Y As Integer, Width As Integer, 
> Height As Integer, Row As Integer, Column As Integer)
>
>    Print Time
>    GridView1[Row, Column].Text = "Hello"
>
> End
>
> It shows, that the draw event is triggered continuously (here about 
> 2.500 times per second) with a very high CPU load.
>
> This issue was already brought up in the recent ML thread "Data event of 
> TableView" a few days ago. I am wondering why this is regarded as 
> "normal". Why does the Gridview fire the draw event continuously? This 
> makes no sense to me. Is this Draw Event different than Draw Events of 
> other controls?
>
> Best regards
>
> Claus

Unless you do something weird in your code, which I don't see, it should 
not behave like that, as the Draw event comes directly from the repaint 
events of the toolkit.

Does it behave the same way with GTK+ and QT? Can you post your project?

--
Benoît Minisini.