gh-111576: Improve documention for tkinter.messagebox (GH-111578)

Author: serhiy-storchaka

Doc/library/tkinter.messagebox.rst

@@ -11,29 +11,184 @@
 
 The :mod:`tkinter.messagebox` module provides a template base class as well as
 a variety of convenience methods for commonly used configurations. The message
-boxes are modal and will return a subset of (True, False, OK, None, Yes, No) based on
+boxes are modal and will return a subset of (``True``, ``False``, ``None``,
+:data:`OK`, :data:`CANCEL`, :data:`YES`, :data:`NO`) based on
 the user's selection. Common message box styles and layouts include but are not
 limited to:
 
 .. figure:: tk_msg.png
 
 .. class:: Message(master=None, **options)
 
-   Create a default information message box.
+   Create a message window with an application-specified message, an icon
+   and a set of buttons.
+   Each of the buttons in the message window is identified by a unique symbolic name (see the *type* options).
+
+   The following options are supported:
+
+      *command*
+         Specifies the function to invoke when the user closes the dialog.
+         The name of the button clicked by the user to close the dialog is
+         passed as argument.
+         This is only available on macOS.
+
+      *default*
+         Gives the :ref:`symbolic name <messagebox-buttons>` of the default button
+         for this message window (:data:`OK`, :data:`CANCEL`, and so on).
+         If this option is not specified, the first button in the dialog will
+         be made the default.
+
+      *detail*
+         Specifies an auxiliary message to the main message given by the
+         *message* option.
+         The message detail will be presented beneath the main message and,
+         where supported by the OS, in a less emphasized font than the main
+         message.
+
+      *icon*
+         Specifies an :ref:`icon <messagebox-icons>` to display.
+         If this option is not specified, then the :data:`INFO` icon will be
+         displayed.
+
+      *message*
+         Specifies the message to display in this message box.
+         The default value is an empty string.
+
+      *parent*
+         Makes the specified window the logical parent of the message box.
+         The message box is displayed on top of its parent window.
+
+      *title*
+         Specifies a string to display as the title of the message box.
+         This option is ignored on macOS, where platform guidelines forbid
+         the use of a title on this kind of dialog.
+
+      *type*
+         Arranges for a :ref:`predefined set of buttons <messagebox-types>`
+         to be displayed.
+
+   .. method:: show(**options)
+
+      Display a message window and wait for the user to select one of the buttons. Then return the symbolic name of the selected button.
+      Keyword arguments can override options specified in the constructor.
+
 
 **Information message box**
 
-.. method:: showinfo(title=None, message=None, **options)
+.. function:: showinfo(title=None, message=None, **options)
+
+   Creates and displays an information message box with the specified title
+   and message.
 
 **Warning message boxes**
 
-.. method:: showwarning(title=None, message=None, **options)
-            showerror(title=None, message=None, **options)
+.. function:: showwarning(title=None, message=None, **options)
+
+   Creates and displays a warning message box with the specified title
+   and message.
+
+.. function:: showerror(title=None, message=None, **options)
+
+   Creates and displays an error message box with the specified title
+   and message.
 
 **Question message boxes**
 
-.. method:: askquestion(title=None, message=None, **options)
-            askokcancel(title=None, message=None, **options)
-            askretrycancel(title=None, message=None, **options)
-            askyesno(title=None, message=None, **options)
-            askyesnocancel(title=None, message=None, **options)
+.. function:: askquestion(title=None, message=None, *, type=YESNO, **options)
+
+   Ask a question. By default shows buttons :data:`YES` and :data:`NO`.
+   Returns the symbolic name of the selected button.
+
+.. function:: askokcancel(title=None, message=None, **options)
+
+   Ask if operation should proceed. Shows buttons :data:`OK` and :data:`CANCEL`.
+   Returns ``True`` if the answer is ok and ``False`` otherwise.
+
+.. function:: askretrycancel(title=None, message=None, **options)
+
+   Ask if operation should be retried. Shows buttons :data:`RETRY` and :data:`CANCEL`.
+   Return ``True`` if the answer is yes and ``False`` otherwise.
+
+.. function:: askyesno(title=None, message=None, **options)
+
+   Ask a question. Shows buttons :data:`YES` and :data:`NO`.
+   Returns ``True`` if the answer is yes and ``False`` otherwise.
+
+.. function:: askyesnocancel(title=None, message=None, **options)
+
+   Ask a question. Shows buttons :data:`YES`, :data:`NO` and :data:`CANCEL`.
+   Return ``True`` if the answer is yes, ``None`` if cancelled, and ``False``
+   otherwise.
+
+
+.. _messagebox-buttons:
+
+Symbolic names of buttons:
+
+.. data:: ABORT
+   :value: 'abort'
+.. data:: RETRY
+   :value: 'retry'
+.. data:: IGNORE
+   :value: 'ignore'
+.. data:: OK
+   :value: 'ok'
+.. data:: CANCEL
+   :value: 'cancel'
+.. data:: YES
+   :value: 'yes'
+.. data:: NO
+   :value: 'no'
+
+.. _messagebox-types:
+
+Predefined sets of buttons:
+
+.. data:: ABORTRETRYIGNORE
+   :value: 'abortretryignore'
+
+   Displays three buttons whose symbolic names are :data:`ABORT`,
+   :data:`RETRY` and :data:`IGNORE`.
+
+.. data:: OK
+   :value: 'ok'
+   :noindex:
+
+   Displays one button whose symbolic name is :data:`OK`.
+
+.. data:: OKCANCEL
+   :value: 'okcancel'
+
+   Displays two buttons whose symbolic names are :data:`OK` and
+   :data:`CANCEL`.
+
+.. data:: RETRYCANCEL
+   :value: 'retrycancel'
+
+   Displays two buttons whose symbolic names are :data:`RETRY` and
+   :data:`CANCEL`.
+
+.. data:: YESNO
+   :value: 'yesno'
+
+   Displays two buttons whose symbolic names are :data:`YES` and
+   :data:`NO`.
+
+.. data:: YESNOCANCEL
+   :value: 'yesnocancel'
+
+   Displays three buttons whose symbolic names are :data:`YES`,
+   :data:`NO` and :data:`CANCEL`.
+
+.. _messagebox-icons:
+
+Icon images:
+
+.. data:: ERROR
+   :value: 'error'
+.. data:: INFO
+   :value: 'info'
+.. data:: QUESTION
+   :value: 'question'
+.. data:: WARNING
+   :value: 'warning'