| # |
| # An Introduction to Tkinter |
| # tkSimpleDialog.py |
| # |
| # Copyright (c) 1997 by Fredrik Lundh |
| # |
| # fredrik@pythonware.com |
| # http://www.pythonware.com |
| # |
| |
| # -------------------------------------------------------------------- |
| # dialog base class |
| |
| '''Dialog boxes |
| |
| This module handles dialog boxes. It contains the following |
| public symbols: |
| |
| Dialog -- a base class for dialogs |
| |
| askinteger -- get an integer from the user |
| |
| askfloat -- get a float from the user |
| |
| askstring -- get a string from the user |
| ''' |
| |
| from Tkinter import * |
| |
| class Dialog(Toplevel): |
| |
| '''Class to open dialogs. |
| |
| This class is intended as a base class for custom dialogs |
| ''' |
| |
| def __init__(self, parent, title = None): |
| |
| '''Initialize a dialog. |
| |
| Arguments: |
| |
| parent -- a parent window (the application window) |
| |
| title -- the dialog title |
| ''' |
| Toplevel.__init__(self, parent) |
| |
| self.withdraw() # remain invisible for now |
| # If the master is not viewable, don't |
| # make the child transient, or else it |
| # would be opened withdrawn |
| if parent.winfo_viewable(): |
| 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() |
| |
| |
| if not self.initial_focus: |
| self.initial_focus = self |
| |
| self.protocol("WM_DELETE_WINDOW", self.cancel) |
| |
| if self.parent is not None: |
| self.geometry("+%d+%d" % (parent.winfo_rootx()+50, |
| parent.winfo_rooty()+50)) |
| |
| self.deiconify() # become visibile now |
| |
| self.initial_focus.focus_set() |
| |
| # wait for window to appear on screen before calling grab_set |
| self.wait_visibility() |
| self.grab_set() |
| self.wait_window(self) |
| |
| def destroy(self): |
| '''Destroy the window''' |
| self.initial_focus = None |
| Toplevel.destroy(self) |
| |
| # |
| # construction hooks |
| |
| def body(self, master): |
| '''create dialog body. |
| |
| return widget that should have initial focus. |
| This method should be overridden, and is called |
| by the __init__ method. |
| ''' |
| pass |
| |
| def buttonbox(self): |
| '''add standard button box. |
| |
| override if you do not 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() |
| |
| try: |
| self.apply() |
| finally: |
| self.cancel() |
| |
| def cancel(self, event=None): |
| |
| # put focus back to the parent window |
| if self.parent is not None: |
| self.parent.focus_set() |
| self.destroy() |
| |
| # |
| # command hooks |
| |
| def validate(self): |
| '''validate the data |
| |
| This method is called automatically to validate the data before the |
| dialog is destroyed. By default, it always validates OK. |
| ''' |
| |
| return 1 # override |
| |
| def apply(self): |
| '''process the data |
| |
| This method is called automatically to process the data, *after* |
| the dialog is destroyed. By default, it does nothing. |
| ''' |
| |
| pass # override |
| |
| |
| # -------------------------------------------------------------------- |
| # convenience dialogues |
| |
| class _QueryDialog(Dialog): |
| |
| def __init__(self, title, prompt, |
| initialvalue=None, |
| minvalue = None, maxvalue = None, |
| parent = None): |
| |
| if not parent: |
| import Tkinter |
| parent = Tkinter._default_root |
| |
| self.prompt = prompt |
| self.minvalue = minvalue |
| self.maxvalue = maxvalue |
| |
| self.initialvalue = initialvalue |
| |
| Dialog.__init__(self, parent, title) |
| |
| def destroy(self): |
| self.entry = None |
| Dialog.destroy(self) |
| |
| def body(self, master): |
| |
| w = Label(master, text=self.prompt, justify=LEFT) |
| w.grid(row=0, padx=5, sticky=W) |
| |
| self.entry = Entry(master, name="entry") |
| self.entry.grid(row=1, padx=5, sticky=W+E) |
| |
| if self.initialvalue is not None: |
| self.entry.insert(0, self.initialvalue) |
| self.entry.select_range(0, END) |
| |
| return self.entry |
| |
| def validate(self): |
| |
| import tkMessageBox |
| |
| try: |
| result = self.getresult() |
| except ValueError: |
| tkMessageBox.showwarning( |
| "Illegal 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( |
| "Too large", |
| "The allowed maximum value is %s. " |
| "Please try again." % self.maxvalue, |
| parent = self |
| ) |
| return 0 |
| |
| self.result = result |
| |
| return 1 |
| |
| |
| class _QueryInteger(_QueryDialog): |
| errormessage = "Not an integer." |
| def getresult(self): |
| return int(self.entry.get()) |
| |
| def askinteger(title, prompt, **kw): |
| '''get an integer from the user |
| |
| Arguments: |
| |
| title -- the dialog title |
| prompt -- the label text |
| **kw -- see SimpleDialog class |
| |
| Return value is an integer |
| ''' |
| d = _QueryInteger(title, prompt, **kw) |
| return d.result |
| |
| class _QueryFloat(_QueryDialog): |
| errormessage = "Not a floating point value." |
| def getresult(self): |
| return float(self.entry.get()) |
| |
| def askfloat(title, prompt, **kw): |
| '''get a float from the user |
| |
| Arguments: |
| |
| title -- the dialog title |
| prompt -- the label text |
| **kw -- see SimpleDialog class |
| |
| Return value is a float |
| ''' |
| d = _QueryFloat(title, prompt, **kw) |
| return d.result |
| |
| class _QueryString(_QueryDialog): |
| def __init__(self, *args, **kw): |
| if "show" in kw: |
| self.__show = kw["show"] |
| del kw["show"] |
| else: |
| self.__show = None |
| _QueryDialog.__init__(self, *args, **kw) |
| |
| def body(self, master): |
| entry = _QueryDialog.body(self, master) |
| if self.__show is not None: |
| entry.configure(show=self.__show) |
| return entry |
| |
| def getresult(self): |
| return self.entry.get() |
| |
| def askstring(title, prompt, **kw): |
| '''get a string from the user |
| |
| Arguments: |
| |
| title -- the dialog title |
| prompt -- the label text |
| **kw -- see SimpleDialog class |
| |
| Return value is a string |
| ''' |
| d = _QueryString(title, prompt, **kw) |
| return d.result |
| |
| if __name__ == "__main__": |
| |
| root = Tk() |
| root.update() |
| |
| print askinteger("Spam", "Egg count", initialvalue=12*12) |
| print askfloat("Spam", "Egg weight\n(in tons)", minvalue=1, maxvalue=100) |
| print askstring("Spam", "Egg label") |
