[Tkinter-discuss] Open a Help window from a Dialog window

[Vasilis Vlachoudis]

Dear all,

in my application I would like to have a "Help" button in every dialog 
that opens the common help window. The problem is that the Dialog window 
has the "grab_set" activated so when I open the help window, all the 
events are still redirected to the Dialog. The Help window appears on 
screen but is inactive. Is there a way to specify that the Help window 
is for example a separate thread and still handles the events in 
parallel of the Dialog which has the grab_set for the rest of the program?
Below you can find an example on what I am trying to do, if the user 
first clicks on the "Dialog" button and then from the dialog window 
clicks on "Help" the Help window is frozen.

from Tkinter import *

class Help:
    def __init__(self, master):
        self.toplevel = Toplevel(master)
        frame = Frame(self.toplevel, bg="Yellow")
        frame.pack(expand=YES, fill=BOTH)
        t = Label(frame, text="The quick brown fox jumps\nover the lazy 
dogs tail")
        t.pack()
        b = Button(frame, text="Quit", padx=50, command=self.quit)
        b.pack()
        self.toplevel.title("Help")
        self.toplevel.protocol("WM_DELETE_WINDOW", self.quit)

    def show(self):
        self.toplevel.wait_visibility()

    def quit(self, event=None):
        self.toplevel.destroy()

class Dialog:
    def __init__(self, master):
        self.toplevel = Toplevel(master)
        frame = Frame(self.toplevel, bg="Blue")
        frame.pack(expand=YES, fill=BOTH)
        b = Button(frame, text="Help", padx=50, command=self.help)
        b.pack()
        b = Button(frame, text="Quit", padx=50, command=self.quit)
        b.pack()
        self.toplevel.title("Dialog")
        self.toplevel.protocol("WM_DELETE_WINDOW", self.quit)

    def show(self):
        self.toplevel.grab_set()
        self.toplevel.wait_window()

    def quit(self, event=None):
        self.toplevel.destroy()

    def help(self, event=None):
        help = Help(root)
        help.show()

def dialog():
    dlg = Dialog(root)
    dlg.show()

def help():
    win = Help(root)
    win.show()

def quit():
    root.destroy()

# -----
root = Tk()
root.title("Root")
Button(root, text="Dialog", padx=50, command=dialog).pack()
Button(root, text="Help", padx=50, command=help).pack()
Button(root, text="Quit", padx=50, command=quit).pack()
root.mainloop()

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