Processes and GUI

steve64

I'm trying to build a GUI app with LuaRT able to run an external Python script redirecting stdout to a widget. It seems working but I can not yet manage GUI events while the script is running.
What am I missing?
See the following example:

ui = require 'ui'

local sysutils = require 'sysutils'

win = ui.Window('Py Demo', 'dialog', 400, 400)
run_button = ui.Button(win, 'Run', 10, 10)
other_button = ui.Button(win, 'Other', 100, 10)
out_text = ui.Edit(win, '', 10, 40, 400-20, 300)
out_text.font = 'Consolas'
 
local p 
 
function run_button:onClick()
  p = sysutils.Process('python demo1.py', false, true)
  out_text.text = ''
  p:spawn()
  function p:onRedirect(data)   out_text:append(tostring(data))  end  
end

function other_button:onClick() --> not executed until the process is terminated
  print('OTHER CLICKED')
end

win:show()
ui.run(win):wait()

steve64

In the meanwhile I discovered that it seems a matter of timing,
Using onMouseDown() instead of onClick() as handler for other_button I'm getting some event triggered during the Python subprocess execution.
There is still a showstopper: while the subtask is running the mouse changes to hourglass...
This happens due to onRedirect() if I append the data to the Edit widget.
If I just print the data inside onRedirect() the hourglass is not shown.

Samir

You should make a derived object from Process, and not use a local function the onClick() handlers.

Those kind of interop between processes has always been a pain