Using PySimpleGui, how to get buttons to work?

Question

Trying out PySimpleGui for the first time, wanting to create an exec program that allows the user to either move or copy directories/files to the destination of their choice, but dont really understand how to link the action to the buttons.

My current program looks like this:

import PySimpleGUI as sg
import shutil, errno
src = ""
dest = ""
def copy(src, dest):
    try:
        shutil.copytree(src, dest)
    except OSError as e:
        # If the error was caused because the source wasn't a directory
        if e.errno == errno.ENOTDIR:
            shutil.copy(src, dest)
        else:
            print('Directory not copied. Error: %s' % e)

#Me testing out commands in PSG
layout = [[ sg.Text("Select path from source to 
destination")],
[sg.Text("Source Folder", size=(15,1)), sg.InputText(src), 
sg.FolderBrowse()],
[sg.Text("Destination Folder", size=(15,1)), 
sg.InputText(dest), sg.FolderBrowse()],
[sg.Button("Transfer", button_color=("white", "blue"), size= 
(6, 1)),sg.Button(copy, "Copy", button_color=("white", 
"green"), size=(6, 1)),sg.Exit(button_color=("white", "red"), 
size=(6, 1))]]

event = sg.Window("Mass File Transfer").Layout(layout).Read()

From what I am able to clearly understand, I would think that involving the copy command into the button's properties would link it to the command defined earlier in the code. I have src and dest blank as the inputs for src and dest and laid out with a browse folder extension added on for easier file management.

I think the main program is misunderstanding that PySimpleGUI does not have a similar API and architecture to the major GUI frameworks. It does not follow their conventions. Instead of a callback model, like you're attempting, events are handled in a simple event loop. — Mike from PSG, Mar 22 '19 at 17:11

score 5 · Answer 1 · answered Mar 21 '19 at 18:01

There is no "linking" of buttons to functions, nor callback functions.

To do what you're looking for, calling copy when you get a "Copy Button"event back from a Read.

I urge you to read through the docs to get an understanding how these calls to Button, etc, work. http://www.PySimpleGUI.org

Here's what I think you are looking for your code to do:

import PySimpleGUI as sg
import shutil, errno
src = ""
dest = ""
def copy(src, dest):
    try:
        shutil.copytree(src, dest)
    except OSError as e:
        # If the error was caused because the source wasn't a directory
        if e.errno == errno.ENOTDIR:
            shutil.copy(src, dest)
        else:
            print('Directory not copied. Error: %s' % e)

#Me testing out commands in PSG
layout = [[ sg.Text("Select path from source to destination")],
[sg.Text("Source Folder", size=(15,1)), sg.InputText(src),
sg.FolderBrowse()],
[sg.Text("Destination Folder", size=(15,1)),
sg.InputText(dest), sg.FolderBrowse()],
[sg.Button("Transfer", button_color=("white", "blue"), size=
(6, 1)),sg.Button("Copy", button_color=("white",
"green"), size=(6, 1)),sg.Exit(button_color=("white", "red"),
size=(6, 1))]]

window = sg.Window("Mass File Transfer").Layout(layout)

while True:
    event, values = window.Read()
    print(event, values)
    if event in (None, 'Exit'):
        break

    if event == 'Copy':
        copy(values[0], values[1])

Using PySimpleGui, how to get buttons to work?

1 Answers1