lazarus synedit
lazarus / 8-Other

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pluggie · 2004-11-21 02:24

synedit in lazarus seems to go extremely over the top with repainting
on

i give some test code below to demonstrate this by drawing over the
synedit so you cans ee th replainting differences in delphi and
lazarus
(yes i do play dirty to get at the synedits canvas here)

there is noticeable slowness in the lazarus ide on some linux systems:
linux running on vmware seems to do it in my experiance so does linux
running on some hardware setups i belive this issue is the cause
(though i haven't got round to playing with my test code on linux yet)

i have found the slowdown on all three of the linux systems i have
tried lazarus on theese were
vmware using its own X server running a heavilly upgraded knoppix
hdinstall (i think knoppix 3.1 based but im unsure) using the vmware X
server
vmware using remote X to cygwin-xfree86 on the host using the same os
install as above
a duron 800 running a heailly upgraded knoppix 3.1 (this one im sure
about) hdinstall with ati 128 graphics which i belive were running
using a framebuffer driver but im unsure on this

the test code follows you are expected to put a synedit and a button
on the form then double click on the button and paste this in place of
its event handler

type
  tgetatcanvas=class(tsynedit)
  public
    property canvas;
  end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  tgetatcanvas(synedit1).canvas.rectangle(0,100,100,200);
end;

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Lightning · 2004-11-21 14:06

You're not the only one that noticed SynEdit is slow.
It seems the painting is done more than needed even on windows.
I tested an app i made that uses synedit in Delphi and scrolling is
much faster and consumes less CPU than the Lazarus editor.
Please report a bug/wish.

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Marc · 2004-11-22 11:30

Synedit drawin is highly optimized. To be able to draw on non win32
platforms we had to mimic some win32 api calls. This isn't optimal yet
and has no high priority to fix.
This is a drawback when using a multiplatform solution.

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Lightning · 2004-11-22 20:03

Yes i guess it's not a priority, it works  !!!
Keep up the good work.