[solved] unable to change a Splitter location programmatically
lazarus / 31-LCL

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indydev · 2025-04-24 01:40

I can't seem to set/change a splitter's location in code. I have a
splitter between a Scrollbox and a Listview control inside a Panel. 
The splitter properly adjusts with user input, but if I try to set the
position (after loading content in the scrollbox) in code, it doesn't
move. I have tried setting the Splitter.Top value, and using the
Splitter.MoveSplitter(offset) method.

Here is the relevant code:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.DisplaySpriteSheet;begin  if PackedBitmap = nil then  begin   
SheetScrollBox.Invalidate;    Exit;  end;  SheetScrollBox.Height :=
min(PackedBitmap.Height + 2* bgBorderSize, Screen.Height - 185); 
Splitter1.Top := SheetScrollBox.Height + 1; 
//Splitter1.MoveSplitter(Splitter1.Top - SheetScrollBox.Height + 1); 
Panel2.Invalidate;end; 
I have tried various anchor and align value combinations to see if
that played a role, but so far no dice.

Maybe it can't be done?

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Hansvb · 2025-04-24 07:08

Hi,
Not sure if this is what you mean but in the attached example you can
slide the splitter using code. Take a good look at the anchor editor
of the listview. if you only need 1 splitter you can also look at the
TPairSplitter

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indydev · 2025-04-24 14:48

Thanks. The splitter definitely moves when you click each button, but
on my system, the drag function of the splitter doesn't work.  I don't
understand why either of these work the way they do (code moves, but
doesn't drag in yours. mine drags, but doesn't move using code).

I have to get to a meeting, so I will have to look more closely when I
have some time. I only looked at the first program. There's a second
one you included, but will have to look at it later.

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Ally · 2025-04-24 15:24

Hello indydev,

Here is another example that only requires a few lines of program
code.
Most of the work is done with the anchor editor.

Greetings
Roland

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indydev · 2025-04-24 18:43

Ok, Thanks for these examples.  My problem isn't solved, but I know it
isn't the code not being able to move the splitter. I threw on a
button to my form it moves the slider using code. This probably has to
do with the splitter not updating/painting etc. 

For now I just have a button to handle it manually.

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indydev · 2025-04-24 18:54

Problem Solved.  Instead of trying to resize the SheetScrollBox, I
just needed to move the Splitter1.Top directly.

Thanks for everyone's advice and patience with me.