[Question] How to update class parameter within inherited class about pysimplegui HOT 4 OPEN

OK, I've sort of solved it. My hover method works if I include all parameters in order up to image source without using keywords eg.
self.update('Cancel', ('white',sg.theme_background_color()), False, red_hovered)
however fails otherwise. I'd be interested to know why & if there's a better way to do something like this.

from pysimplegui.

Firstly, I found that you use a string equal to a value in the method of update, it's wrong syntax.

self.update('image_data'=red_hovered)

>>> class Test():
...     def update(self, image_data=None):
...         print(image_data)
...
>>> test = Test()
>>> test.update("image_data"=1)
  File "<stdin>", line 1
    test.update("image_data"=1)
                ^
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?

It should be

self.update(image_data=red_hovered)

>>> test.update(image_data=1)
1

from pysimplegui.

Thanks, I thought I'd tried that but obviously not!
That works to the extent that I don't get an error & the correct graphic is displayed but I get the graphic button within a white box (per button_color parameter), which I'm trying to avoid. I tried updating that using the same syntax but it still left it within the white box, whereas if I don't name any parameters & just supply values up to the image source the white box is not displayed. I can live with that as a 'work around' but I am curious why it doesn't work as I would expect

Interestingly, I create the button with button_ color = ('white', background). If I reverse them within the 'hover' method & then reverse them again, back to the original in my 'unhover' method it all displays correctly with no white box!

from pysimplegui.

Not sure what you mean, better with code and pictures to show what your expectation.

Example code

import PySimpleGUI as sg

bg = sg.theme_background_color()
data  = [sg.EMOJI_BASE64_HAPPY_LAUGH, sg.EMOJI_BASE64_CRY]
color = [('white', bg), (bg, 'white')]

layout = [
    [sg.Button("", image_data=data[0], key="1st", metadata=0, border_width=0, button_color=color[0]),
     sg.Checkbox("Change Background", key="Bg")],
]
window = sg.Window("Title", layout)

while True:

    event, values = window.read()

    if event == sg.WIN_CLOSED:
        break
    elif event == "1st":
        element = window[event]
        element.metadata = 1 - element.metadata
        element.update(image_data=data[element.metadata], button_color=color[element.metadata] if values["Bg"] else None)

window.close()

from pysimplegui.