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#
# An Introduction to Tkinter
# tkSimpleDialog.py
#
# Copyright (c) 1997 by Fredrik Lundh
#
# fredrik@pythonware.com
# http://www.pythonware.com
#
# --------------------------------------------------------------------
# dialog base class
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
# --------------------------------------------------------------------
# convenience dialogues
import string
class _QueryDialog(Dialog):
def __init__(self, title, prompt,
minvalue = None, maxvalue = None,
parent = None):
from Tkinter import _default_root
if not parent:
parent = _default_root
self.prompt = prompt
self.minvalue = minvalue
self.maxvalue = maxvalue
Dialog.__init__(self, parent, title)
def body(self, master):
w = Label(master, text=self.prompt)
w.grid(row=0, padx=5, sticky=W)
self.entry = Entry(master, name="entry")
self.entry.grid(row=1, padx=5, sticky=W+E)
return self.entry
def validate(self):
import tkMessageBox
try:
result = self.getresult()
except ValueError:
tkMessageBox.showwarning(
"Bad value",
self.errormessage + "\nPlease try again",
parent = self
)
return 0
if self.minvalue is not None and result < self.minvalue:
tkMessageBox.showwarning(
"Too small",
"The allowed minimum value is %s. "
"Please try again" % self.minvalue,
parent = self
)
return 0
if self.maxvalue is not None and result > self.maxvalue:
tkMessageBox.showwarning(
"Bad value",
"The allowed maximum value is %s. "
"Please try again" % self.maxvalue,
parent = self
)
return 0
self.result = result
return 1
class _QueryInteger(_QueryDialog):
errormessage = "Invalid integer"
def getresult(self):
return string.atoi(self.entry.get())
def askinteger(title, prompt, **kw):
d = apply(_QueryInteger, (title, prompt), kw)
return d.result
class _QueryFloat(_QueryDialog):
errormessage = "Invalid floating point value"
def getresult(self):
return string.atof(self.entry.get())
def askfloat(title, prompt, **kw):
d = apply(_QueryFloat, (title, prompt), kw)
return d.result
class _QueryString(_QueryDialog):
def getresult(self):
return self.entry.get()
def askstring(title, prompt, **kw):
d = apply(_QueryString, (title, prompt), kw)
return d.result
if __name__ == "__main__":
root = Tk()
root.update()
print askinteger("Spam", "Egg count")
print askfloat("Spam", "Egg weight")
print askstring("Spam", "Egg label")
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