Re: Responsive Splash Screen while creating GUI objects

I created a reasonably large app and was concerned about how long the 
app was taking to load.  So, as an experiment I create a frame with 
approx. 900 objects on a scroll panel.  It loaded in just a couple 
seconds - some times less on a windows 10 box.  It made me realize that 
it was not the wxPython GUI objects that was taking the time but my 
database connections.  I wonder if you are having the same issue as I did?

Python 3.6, wxPython 4.0.7, windows 10.

Johnf

On 5/12/20 7:03 AM, Jasper Alexion wrote:
>
> Hello,
>
>
> We are currently in the process of creating a splash screen for our 
> application and we are encountering a problem that causes the GUI to 
> become unresponsive.
>
>
> Our application has a very large GUI containing thousands of fields 
> and labels. Creating this GUI takes around 10 seconds. In the long 
> term we are working towards redesigning our application more towards 
> MVC, but as of now it is impossible to dynamically create the GUI when 
> needed.
>
> Goal:
>
>  1. We want a responsive splash screen while our application is starting.
>  2. Responsive means: draggable window, moving wx.Gauge, etc..
>
> 1.
>     2.
>
> Problem:
>
>  1. We can only create GUI objects from the GUI-thread that runs the
>     mainloop
>  2. When the mainloop is busy creating GUI objects, the WHOLE
>     application (at least the GUI part) freezes.
>
> 1.
>     2.
>
> Notes
>
>  1. We could use wx.Yield() to let the splash screen update itself.
>     However, this would result in a splash screen that sporadically
>     updates at random moments instead of being responsive at alltimes
>     with a nice smooth flowing wx.Gauge
>  2. Weareusing threads(wx.Timer,wx.PostEvent,wx.CallAfter)to keep
>     (parts of the) splash screen responsive, this works well during
>     normal operation. However, as soon as the mainloop is too busy to
>     handle wx events the whole GUI freezes.
>
> 1.
>     2.
>
> How could we achieve this?
>
> We are using Python 3.8.2and the following libraries:
>
> numpy==1.18.4
> Pillow==7.1.2
> Pypubsub==4.0.3
> six==1.14.0
> wxPython==4.1.0
>
> Thanks in advance,
>
> Jasper
>
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