[Tkinter-discuss] Transient, grab and focus problems...

[Vasilis Vlachoudis]

Dear all

in my application I have some toplevels that appear as InPlaceEdit for Listboxes when the user
clicks a field in a listbox.

This time I've tried to create a 2 nested level toplevel, but I am completely losing the focus on the
return and I didn't find any way to restore it.
Bellow there is a small example just to demonstrate the problem

By clicking the button it opens a toplevel, transient, overrideredirect(1) with a Text() which
has the grab and the focus.

Once you press a certain key (now the +) it opens a second level, another toplevel of a listbox with override and grab
On return from the second toplevel the focus is completly lost.
I cannot restore the focus on the text, I've tried to use focus_set(), grab_set etc.. but with no success.

Any ideas? Where did the focus go and how why the focus_set() doesn't work

Thanks in advance
Vasilis

from Tkinter import *

# ========================================================
class TopList(Toplevel):
    def __init__(self, master):
        Toplevel.__init__(self, master)
        self.overrideredirect(1)
        self.transient(master)
        self.bind("<Escape>", self.close)

        self.l = Listbox(self, bg="Yellow")
        self.l.pack()
        self.l.bind("<ButtonRelease-1>", self.close)

        for item in ["one","two","three","four"]: self.l.insert(END,item)
        self.result = ""

    # ------------------------------------------------
    def show(self):
        self.deiconify()
        self.wait_visibility()
        self.grab_set()
        self.l.focus_set()
        self.wait_window()
        self.grab_release()
        return self.result

    # ------------------------------------------------
    def close(self, event=None):
        if event:
            self.result = self.l.get(self.l.nearest(event.y))
        else:
            self.result = self.l.get(ACTIVE)
        self.destroy()

# ========================================================
class TopText(Toplevel):
    def __init__(self, master):
        Toplevel.__init__(self, master)
        self.overrideredirect(1)
        self.transient(master)
        self.bind("<Escape>", self.close)

        self.t = Text(self, bg="White")
        self.t.pack()
        self.t.bind("<Key-plus>", self.openList)

        self.result = ""

    # ------------------------------------------------
    def show(self):
        self.deiconify()
        self.wait_visibility()
        self.grab_set()
        self.t.focus_set()
        self.wait_window()
        return self.result

    # ------------------------------------------------
    def close(self, event=None):
        self.result = self.t.get(1.0,END)
        self.destroy()

    # ------------------------------------------------
    def openList(self, event=None):
        self.grab_release()
        result = TopList(self).show()
        self.t.focus_set()
        self.grab_set()
        self.t.insert("%s + 1 chars"%(INSERT),result)

# ========================================================
def openText():
    print TopText(tk).show()

tk = Tk()
e = Entry(tk)
e.pack()
e.focus_set()

b = Button(tk, text="Text", command=openText)
b.pack()

tk.mainloop()
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