Tkinter dialogs
***************


"tkinter.simpledialog" — Standard Tkinter input dialogs
=======================================================

**Source code:** Lib/tkinter/simpledialog.py

======================================================================

The "tkinter.simpledialog" module contains convenience classes and
functions for creating simple modal dialogs to get a value from the
user.

tkinter.simpledialog.askfloat(title, prompt, *, initialvalue=None, minvalue=None, maxvalue=None, parent=None)
tkinter.simpledialog.askinteger(title, prompt, *, initialvalue=None, minvalue=None, maxvalue=None, parent=None)
tkinter.simpledialog.askstring(title, prompt, *, initialvalue=None, show=None, parent=None)

   Prompt the user to enter a value of the desired type and return it,
   or "None" if the dialog is cancelled.

   *title* is the dialog title and *prompt* the message shown above
   the entry. *initialvalue* is the value initially placed in the
   entry. *parent* is the window over which the dialog is shown.
   "askinteger()" and "askfloat()" also accept *minvalue* and
   *maxvalue*, which bound the accepted value. "askstring()" also
   accepts *show*, a character used to mask the entered text, for
   example "'*'" to hide a password.

class tkinter.simpledialog.Dialog(parent, title=None)

   The base class for custom dialogs. Instantiating it shows the
   dialog modally and returns once the user closes it; the entered
   value is then available in the "result" attribute.

   result

      The value produced by "apply()", or "None" if the dialog was
      cancelled.

   body(master)

      Override to construct the dialog’s interface and return the
      widget that should have initial focus.

   buttonbox()

      Default behaviour adds OK and Cancel buttons. Override for
      custom button layouts.

   validate()

      Validate the data entered by the user. Return true if it is
      valid, in which case the dialog proceeds to "apply()"; return
      false to keep the dialog open. The default implementation always
      returns true; override it to check the input.

   apply()

      Process the data entered by the user, for example by storing it
      in the "result" attribute. Called after "validate()" succeeds
      and just before the dialog is destroyed. The default
      implementation does nothing; override it to act on or store the
      result.

   destroy()

      Destroy the dialog window, clearing the reference to the widget
      that had the initial focus.

class tkinter.simpledialog.SimpleDialog(master, text='', buttons=[], default=None, cancel=None, title=None, class_=None)

   A simple modal dialog that displays the message *text* above a row
   of push buttons whose labels are given by *buttons*, and returns
   the index of the button the user presses. *default* is the index of
   the button activated by the Return key, *cancel* the index returned
   when the window is closed through the window manager, *title* the
   window title, and *class_* the Tk class name of the window.

   go()

      Display the dialog, wait until the user presses a button or
      closes the window, and return the index of the chosen button.


"tkinter.filedialog" — File selection dialogs
=============================================

**Source code:** Lib/tkinter/filedialog.py

======================================================================

The "tkinter.filedialog" module provides classes and factory functions
for creating file/directory selection windows.


Native load/save dialogs
------------------------

The following classes and functions provide file dialog windows that
combine a native look-and-feel with configuration options to customize
behaviour. The following keyword arguments are applicable to the
classes and functions listed below:

      *parent* - the window to place the dialog on top of

      *title* - the title of the window

      *initialdir* - the directory that the dialog starts in

      *initialfile* - the file selected upon opening of the dialog

      *filetypes* - a sequence of (label, pattern) tuples, ‘*’ wildcard is allowed

      *defaultextension* - default extension to append to file (save dialogs)

      *multiple* - when true, selection of multiple items is allowed

**Static factory functions**

The below functions when called create a modal, native look-and-feel
dialog, wait for the user’s selection, and return it. The exact return
value depends on the function (see below); when the dialog is
cancelled it is an empty string, an empty tuple or "None". The precise
type of this empty value may vary between platforms and Tk versions,
so test the result for truth rather than comparing it with a specific
value.

tkinter.filedialog.askopenfile(mode='r', **options)
tkinter.filedialog.askopenfiles(mode='r', **options)

   Create an "Open" dialog. "askopenfile()" returns the opened file
   object, or "None" if the dialog is cancelled. "askopenfiles()"
   returns a list of the opened file objects, or an empty tuple if
   cancelled. The files are opened in mode *mode* (read-only "'r'" by
   default).

tkinter.filedialog.asksaveasfile(mode='w', **options)

   Create a "SaveAs" dialog and return the opened file object, or
   "None" if the dialog is cancelled. The file is opened in mode
   *mode* ("'w'" by default).

tkinter.filedialog.askopenfilename(**options)
tkinter.filedialog.askopenfilenames(**options)

   Create an "Open" dialog. "askopenfilename()" returns the selected
   filename as a string, or an empty string if the dialog is
   cancelled. "askopenfilenames()" returns a tuple of the selected
   filenames, or an empty tuple if cancelled.

tkinter.filedialog.asksaveasfilename(**options)

   Create a "SaveAs" dialog and return the selected filename as a
   string, or an empty string if the dialog is cancelled.

tkinter.filedialog.askdirectory(**options)

   Prompt the user to select a directory, and return its path as a
   string, or an empty string if the dialog is cancelled. Additional
   keyword option: *mustexist* - if true, the user may only select an
   existing directory (false by default).

class tkinter.filedialog.Open(master=None, **options)
class tkinter.filedialog.SaveAs(master=None, **options)
class tkinter.filedialog.Directory(master=None, **options)

   The above three classes provide native dialog windows for loading
   and saving files and for selecting a directory.

**Convenience classes**

The below classes are used for creating file/directory windows from
scratch. These do not emulate the native look-and-feel of the
platform.

Note:

  The *FileDialog* class should be subclassed for custom event
  handling and behaviour.

class tkinter.filedialog.FileDialog(master, title=None)

   Create a basic file selection dialog.

   cancel_command(event=None)

      Trigger the termination of the dialog window.

   dirs_double_event(event)

      Event handler for double-click event on directory.

   dirs_select_event(event)

      Event handler for click event on directory.

   files_double_event(event)

      Event handler for double-click event on file.

   files_select_event(event)

      Event handler for single-click event on file.

   filter_command(event=None)

      Filter the files by directory.

   get_filter()

      Retrieve the file filter currently in use.

   get_selection()

      Retrieve the currently selected item.

   go(dir_or_file=os.curdir, pattern='*', default='', key=None)

      Render dialog and start event loop.

   ok_event(event)

      Exit dialog returning current selection.

   ok_command()

      Called when the user confirms the current selection. The base
      implementation accepts the selection and closes the dialog;
      "LoadFileDialog" and "SaveFileDialog" override it to check the
      selection first.

   quit(how=None)

      Exit dialog returning filename, if any.

   set_filter(dir, pat)

      Set the file filter.

   set_selection(file)

      Update the current file selection to *file*.

class tkinter.filedialog.LoadFileDialog(master, title=None)

   A subclass of FileDialog that creates a dialog window for selecting
   an existing file.

   ok_command()

      Test that a file is provided and that the selection indicates an
      already existing file.

class tkinter.filedialog.SaveFileDialog(master, title=None)

   A subclass of FileDialog that creates a dialog window for selecting
   a destination file.

   ok_command()

      Test whether or not the selection points to a valid file that is
      not a directory. Confirmation is required if an already existing
      file is selected.


"tkinter.commondialog" — Dialog window templates
================================================

**Source code:** Lib/tkinter/commondialog.py

======================================================================

The "tkinter.commondialog" module provides the "Dialog" class that is
the base class for dialogs defined in other supporting modules.

class tkinter.commondialog.Dialog(master=None, **options)

   show(**options)

      Render the Dialog window.


"tkinter.dialog" — Classic Tk dialog boxes
==========================================

**Source code:** Lib/tkinter/dialog.py

======================================================================

The "tkinter.dialog" module provides a simple modal dialog box built
on the classic (non-themed) Tk widgets.

tkinter.dialog.DIALOG_ICON

   The name of a bitmap ("'questhead'") suitable for use as the
   *bitmap* of a "Dialog".

class tkinter.dialog.Dialog(master=None, cnf={}, **kw)

   Display a modal dialog box built from the classic (non-themed) Tk
   widgets and wait for the user to press one of its buttons. The
   options, given through *cnf* or as keyword arguments, are all
   required: *title* (the window title), *text* (the message),
   *bitmap* (the name of a bitmap icon, such as "DIALOG_ICON"),
   *default* (the index of the default button) and *strings* (the
   sequence of button labels). After construction, the "num" attribute
   holds the index of the button the user pressed.

   destroy()

      Do nothing. The dialog window is destroyed automatically before
      the constructor returns, so there is nothing left for this
      method to do.

See also: Modules "tkinter.messagebox", Reading and Writing Files
