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learning curve

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  learning curve Verde Denim <tdldev@gmail.com> - 2012-12-27 20:20 -0500
    Re: learning curve alex23 <wuwei23@gmail.com> - 2012-12-27 18:32 -0800
      Re: learning curve Verde Denim <tdldev@gmail.com> - 2012-12-28 13:29 -0500
      Re: learning curve Terry Reedy <tjreedy@udel.edu> - 2012-12-28 21:03 -0500

#35670 — learning curve

Just getting into Py coding and not understanding why this code doesn't
seem to do anything -

# File: dialog2.py
import dialog_handler

class MyDialog(dialog_handler.Dialog):
    def body(self, master):
        Label(master, text="First:").grid(row=0)
        Label(master, text="Second:").grid(row=1)
        self.e1 = Entry(master)
        self.e2 = Entry(master)
        self.e1.grid(row=0, column=1)
        self.e2.grid(row=1, column=1)
        return self.e1 # initial focus

    def apply(self):
        first = string.atoi(self.e1.get())
        second = string.atoi(self.e2.get())
        print first, second # or something

# File: dialog_handler.py

from Tkinter import *
import os

class Dialog(Toplevel):

    def __init__(self, parent, title = None):
        Toplevel.__init__(self, parent)
        self.transient(parent)

        if title:
            self.title(title)
        self.parent = parent
        self.result = None
        body = Frame(self)
        self.initial_focus = self.body(body)
        body.pack(padx=5, pady=5)
        self.buttonbox()
        self.grab_set()

        if not self.initial_focus:
            self.initial_focus = self

        self.protocol("WM_DELETE_WINDOW", self.cancel)
        self.geometry("+%d+%d" % (parent.winfo_rootx()+50,
                                  parent.winfo_rooty()+50))
        self.initial_focus.focus_set()
        self.wait_window(self)

        #
        # construction hooks
        def body(self, master):
            # create dialog body.  return widget that should have
            # initial focus.  this method should be overridden
            pass

        def buttonbox(self):
            # add standard button box. override if you don't want the
            # standard buttons
            box = Frame(self)

            w = Button(box, text="OK", width=10, command=self.ok,
                       default=ACTIVE)
            w.pack(side=LEFT, padx=5, pady=5)
            w = Button(box, text="Cancel", width=10,
                       command=self.cancel)
            w.pack(side=LEFT, padx=5, pady=5)

            self.bind("<Return>", self.ok)
            self.bind("<Escape>", self.cancel)

            box.pack()

        #
        # standard button semantics
        def ok(self, event=None):
            if not self.validate():
                self.initial_focus.focus_set() # put focus back
                return
            self.withdraw()
            self.update_idletasks()
            self.apply()
            self.cancel()

        def cancel(self, event=None):
            # put focus back to the parent window
            self.parent.focus_set()
            self.destroy()

        #
        # command hooks
        def validate(self):
            return 1 # override

        def apply(self):
            pass # override

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#35671

On Dec 28, 11:20 am, Verde Denim <tdl...@gmail.com> wrote:
> Just getting into Py coding and not understanding why this code doesn't
> seem to do anything -

Is that the sum total of your code? You're not showing any
instantiation of your classes.

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#35717

On 12/27/2012 09:32 PM, alex23 wrote:
> On Dec 28, 11:20 am, Verde Denim <tdl...@gmail.com> wrote:
>> Just getting into Py coding and not understanding why this code doesn't
>> seem to do anything -
> 
> Is that the sum total of your code? You're not showing any
> instantiation of your classes.
Yes, as a matter of fact, it is the example verbatim from the tutorial
pages that I found. Apparently, it isn't the best example... Thanks for
the heads up.

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#35730

On 12/28/2012 1:29 PM, Verde Denim wrote:
> On 12/27/2012 09:32 PM, alex23 wrote:
>> On Dec 28, 11:20 am, Verde Denim <tdl...@gmail.com> wrote:
>>> Just getting into Py coding and not understanding why this code doesn't
>>> seem to do anything -
>>
>> Is that the sum total of your code? You're not showing any
>> instantiation of your classes.
> Yes, as a matter of fact, it is the example verbatim from the tutorial
> pages that I found. Apparently, it isn't the best example...

Let us say that it was an example of how to write classes, with usage 
left as an exercise for the reader ;-)

--
Terry Jan Reedy

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