__author__ = 'srodgers'


"""
    This file is part of chargectrl-python-buspirate.

    chargectrl-python-buspirate is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Foobar is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with chargectrl-python-buspirate.  If not, see <http://www.gnu.org/licenses/>.

"""

from tkinter import *
from tkinter.ttk import *


class Dialog(Toplevel):

    def __init__(self, parent, title = None, xoffset = 50, yoffset = 50):

        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()+xoffset,
                                  parent.winfo_rooty()+yoffset))

        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
