Show Intro while Application Inizializing
lazarus / 39-Graphics

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Weitentaaal · 2021-03-25 13:23

Hello Guys

So i tryed out a Lot but didn't find anything to work with.
I Wanted Show a Logo on Screen while MainForm is in "OnCreate" Event.
It Should show a Picture wich gets Displayed until Form is Ready to
use.

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engkin · 2021-03-25 13:30

"Splash screen" is the term you are looking for, search for it and you
will see examples.

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Josh · 2021-03-25 13:41

Hi

If its all to be on the same form,

the order of the events are

create,show,activate.

have a look at this atricle on delphi.
https://www.thoughtco.com/life-cycle-of-a-delphi-form-1058011

I would not add too much to the Oncreate event, just the basics.
use the onshow and activate events; and havea variable that only allow
it to run code once; as thiese events can be fired at other times.

maybe something like this.
global vars
formshowcodecomplete:boolean=false;
formactivatecodecomplete:boolean=false;

The onshow event you could add here something like.
begin
  if formshowcodecomplete=false then
  begin
      formshowcodecomplete:=true;
      // do code here to run only the minimum required to allow form
to be dislayed.
      mysplashpanel.visible:=true;
      .. any important stuff;
  end;
end;

in the onactivate event.
begin
  if formactivatecodecomplete=false then
  begin
    formactivatecodecomplete:=true;
     // do code here to run only once.
    ... do all the initializing stuff now, the stuff that takes time.
    // depending on how much you could also update a visible progress
throughout this routine.
     mysplashpanel.visible:=false;
  end;
end;

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Handoko · 2021-03-25 14:09

Maybe a splash screen like this:
https://forum.lazarus.freepascal.org/index.php/topic,53807.msg398536.h
tml#msg398536

Or a progress bar when loading and preparing some internal data like
this:
https://forum.lazarus.freepascal.org/index.php/topic,50989.msg373578.h
tml#msg373578

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alaa123456789 · 2021-03-25 16:46

i have found very nice library made with c , and post it on this forum
but experts they said it is not important now , so if someone have
experience to port it to lazarus it could be useful for many here

https://forum.lazarus.freepascal.org/index.php/topic,53295.msg394097.h
tml#msg394097

thanks

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engkin · 2021-03-25 16:51

Quote from: alaa123456789 on March 25, 2021, 05:46:03 pmbut experts
they said it is not important now

Huh? where did they say that?

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Handoko · 2021-03-25 16:52

That library is interesting. Unfortunately I'm not familiar with
vector image loading, JSON and C. Not an easy task, finding someone
has all the skills is not easy too.

ps
I believe, not a trivial task means not simple/easy.

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alaa123456789 · 2021-03-25 17:03

Quote
Huh? where did they say that?
in same topic, i think many look for something made the application
attractive.
nothing compulsory 
thanks

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flowCRANE · 2021-03-26 21:58

Some time ago I was making a splash screen for my software. Opening
the program required a dozen or so seconds due to the large number of
graphics being loaded into the memory. The user must know that the
program is starting — he cannot think about what is happening, that
the program window does not show, even though the program is running.

Quote from: Weitentaaal on March 25, 2021, 02:23:07 pmI Wanted Show a
Logo on Screen while MainForm is in "OnCreate" Event.
It Should show a Picture wich gets Displayed until Form is Ready to
use.
It's not done that way. The splash window should be created, displayed
on the screen, and destroyed in a manner unrelated to the main program
window. Typically, this is done so that the entire splash window
process is controlled in the main project file. The splash window is
created and displayed on the screen (and blocked), then the data from
files is loaded into memory (configuration, images, etc.) and the main
window is created. Finally, it destroys the splash and goes to the
Application.Run method, which shows the main program window on the
screen.

However, the worst thing you can do is throw logic into the main form
events. The window should not have any connection with the data and
the loading/saving process. If you do this, it will be difficult to do
anything.

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Weitentaaal · 2021-03-29 11:46

Thanks Guys... there is definitely something i can use