Tkinter reference methods and variables between classes

user_9330113 0
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I am stuck at referencing methods and variables between classes in Tkinter.

Here is an simple example, I have three different types of windows, which I would like to put into different classes.

In the root window, I can click the button to open the second window, where I can input something in to the Text widget.

Also in the 2nd window I want the OK button to read the content in the Text widget and insert the content into another Text widget into the 3rd window. And the Cancel button can close the 2nd window and show the root window again.

There is many bugs in the code, because I couldn't figure out how to make cross references between classes to access the methods and variables.

Could anyone help me to accomplish that? Thanks.

from tkinter import *
from tkinter import scrolledtext
    
    
    def main():
        """The main app function"""
        root = Tk()
        root_window = Root(root)
        return None
    
    
    class Root:
    
        def __init__(self, root):
            # Main root window configration
            self.root = root
            self.root.geometry("200x100")
            
            self.btn_ok = Button(self.root, text="Open new window",
                                 command=NewWindow)
            self.btn_ok.pack(padx=10, pady=10)
    
        def hide(self):
            """Hide the root window."""
            self.root.withdraw()
    
        def show(self):
            """Show the root window from the hide status"""
            self.root.update()
            self.root.deiconify()
    
        def onClosing(self, window):
            window.destroy()
            self.show()
    
    
    class NewWindow:
        
        def __init__(self):
    
            Root.hide()
        
            self.new_window = Toplevel()
    
            lbl = Label(self.new_window, text="Input here:")
            lbl.pack(padx=10, pady=(10, 0), anchor=W)
    
            # Create a scrolledtext widget.
            self.new_content = scrolledtext.ScrolledText(
                                    self.new_window, wrap=WORD,
                                    )
    
            self.new_content.pack(padx=10, expand=True, fill=BOTH, anchor=W)
    
    
            # Respond to the 'Cancel' button.
            btn_cancel = Button(self.new_window, text="Cancel", width=10,
                                command=lambda: Root.onClosing(self.new_window))
            btn_cancel.pack(padx=10, pady=10, side=RIGHT)
    
            # Add 'OK' button to read sequence
            self.btn_ok = Button(self.new_window, text="OK", width=10,
                                 command=WorkingWindow)
            self.btn_ok.pack(padx=10, pady=10, side=RIGHT)
    
        def readContent(self):
            self.content = self.new_content.get(1.0, END)
            self.new_window.destroy()
            workwindow = WorkingWindow()
    
    
    class WorkingWindow:
    
        def __init__(self):
    
            self.work_window = Toplevel()
            self.work_content = scrolledtext.ScrolledText(self.work_window, wrap=WORD, font=("Courier New", 11))
            self.work_content.pack(padx=10, expand=True, fill=BOTH, anchor=W)
            self.work_content.insert(1.0, Root.content)
    
    
    if __name__ == '__main__':
        main()
tkinter class python
1 Answers

You were almost there all you have to do is pass the instance of Root class to other class you are calling

Here is the corrected code:

from tkinter import *
from tkinter import scrolledtext
    
    
def main():
        """The main app function"""
        root = Tk()
        root_window = Root(root)
        root.mainloop()
    
    
class Root:
    
        def __init__(self, root):
            # Main root window configration
            self.root = root
            self.root.geometry("200x100")
            
            self.btn_ok = Button(self.root, text="Open new window",
                                 command=lambda :NewWindow(self))
            self.btn_ok.pack(padx=10, pady=10)
    
        def hide(self):
            """Hide the root window."""
            self.root.withdraw()
    
        def show(self):
            """Show the root window from the hide status"""
            self.root.update()
            self.root.deiconify()
    
        def onClosing(self, window):
            window.destroy()
            self.show()
    
class NewWindow:
        
        def __init__(self, parent):
    
            parent.hide()
        
            self.new_window = Toplevel()
    
            lbl = Label(self.new_window, text="Input here:")
            lbl.pack(padx=10, pady=(10, 0), anchor=W)
    
            # Create a scrolledtext widget.
            self.new_content = scrolledtext.ScrolledText(
                                    self.new_window, wrap=WORD,
                                    )
    
            self.new_content.pack(padx=10, expand=True, fill=BOTH, anchor=W)
    
    
            # Respond to the 'Cancel' button.
            btn_cancel = Button(self.new_window, text="Cancel", width=10,
                                command=lambda: parent.onClosing(self.new_window))
            btn_cancel.pack(padx=10, pady=10, side=RIGHT)
    
            # Add 'OK' button to read sequence
            self.btn_ok = Button(self.new_window, text="OK", width=10,
                                 command=self.readContent)
            self.btn_ok.pack(padx=10, pady=10, side=RIGHT)
    
        def readContent(self):
            self.content = self.new_content.get(1.0, END)
            
            self.new_window.destroy()
            workwindow = WorkingWindow(self)
            
    
    
class WorkingWindow:
    
        def __init__(self, parent):
    
            self.work_window = Toplevel()
            self.work_content = scrolledtext.ScrolledText(self.work_window, wrap=WORD, font=("Courier New", 11))
            self.work_content.pack(padx=10, expand=True, fill=BOTH, anchor=W)
            self.work_content.insert(1.0, parent.content)
    
    
if __name__ == '__main__':
        main()
user_121985020
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