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:mod:`EasyDialogs` --- Basic Macintosh dialogs
==============================================
.. module:: EasyDialogs
:platform: Mac
:synopsis: Basic Macintosh dialogs.
The :mod:`EasyDialogs` module contains some simple dialogs for the Macintosh.
All routines take an optional resource ID parameter *id* with which one can
override the :const:`DLOG` resource used for the dialog, provided that the
dialog items correspond (both type and item number) to those in the default
:const:`DLOG` resource. See source code for details.
The :mod:`EasyDialogs` module defines the following functions:
.. function:: Message(str[, id[, ok]])
Displays a modal dialog with the message text *str*, which should be at most 255
characters long. The button text defaults to "OK", but is set to the string
argument *ok* if the latter is supplied. Control is returned when the user
clicks the "OK" button.
.. function:: AskString(prompt[, default[, id[, ok[, cancel]]]])
Asks the user to input a string value via a modal dialog. *prompt* is the prompt
message, and the optional *default* supplies the initial value for the string
(otherwise ``""`` is used). The text of the "OK" and "Cancel" buttons can be
changed with the *ok* and *cancel* arguments. All strings can be at most 255
bytes long. :func:`AskString` returns the string entered or :const:`None` in
case the user cancelled.
.. function:: AskPassword(prompt[, default[, id[, ok[, cancel]]]])
Asks the user to input a string value via a modal dialog. Like
:func:`AskString`, but with the text shown as bullets. The arguments have the
same meaning as for :func:`AskString`.
.. function:: AskYesNoCancel(question[, default[, yes[, no[, cancel[, id]]]]])
Presents a dialog with prompt *question* and three buttons labelled "Yes", "No",
and "Cancel". Returns ``1`` for "Yes", ``0`` for "No" and ``-1`` for "Cancel".
The value of *default* (or ``0`` if *default* is not supplied) is returned when
the :kbd:`RETURN` key is pressed. The text of the buttons can be changed with
the *yes*, *no*, and *cancel* arguments; to prevent a button from appearing,
supply ``""`` for the corresponding argument.
.. function:: ProgressBar([title[, maxval[, label[, id]]]])
Displays a modeless progress-bar dialog. This is the constructor for the
:class:`ProgressBar` class described below. *title* is the text string displayed
(default "Working..."), *maxval* is the value at which progress is complete
(default ``0``, indicating that an indeterminate amount of work remains to be
done), and *label* is the text that is displayed above the progress bar itself.
.. function:: GetArgv([optionlist[ commandlist[, addoldfile[, addnewfile[, addfolder[, id]]]]]])
Displays a dialog which aids the user in constructing a command-line argument
list. Returns the list in ``sys.argv`` format, suitable for passing as an
argument to :func:`getopt.getopt`. *addoldfile*, *addnewfile*, and *addfolder*
are boolean arguments. When nonzero, they enable the user to insert into the
command line paths to an existing file, a (possibly) not-yet-existent file, and
a folder, respectively. (Note: Option arguments must appear in the command line
before file and folder arguments in order to be recognized by
:func:`getopt.getopt`.) Arguments containing spaces can be specified by
enclosing them within single or double quotes. A :exc:`SystemExit` exception is
raised if the user presses the "Cancel" button.
*optionlist* is a list that determines a popup menu from which the allowed
options are selected. Its items can take one of two forms: *optstr* or
``(optstr, descr)``. When present, *descr* is a short descriptive string that
is displayed in the dialog while this option is selected in the popup menu. The
correspondence between *optstr*\s and command-line arguments is:
+----------------------+------------------------------------------+
| *optstr* format | Command-line format |
+======================+==========================================+
| ``x`` | :option:`-x` (short option) |
+----------------------+------------------------------------------+
| ``x:`` or ``x=`` | :option:`-x` (short option with value) |
+----------------------+------------------------------------------+
| ``xyz`` | :option:`--xyz` (long option) |
+----------------------+------------------------------------------+
| ``xyz:`` or ``xyz=`` | :option:`--xyz` (long option with value) |
+----------------------+------------------------------------------+
*commandlist* is a list of items of the form *cmdstr* or ``(cmdstr, descr)``,
where *descr* is as above. The *cmdstr*s will appear in a popup menu. When
chosen, the text of *cmdstr* will be appended to the command line as is, except
that a trailing ``':'`` or ``'='`` (if present) will be trimmed off.
.. function:: AskFileForOpen( [message] [, typeList] [, defaultLocation] [, defaultOptionFlags] [, location] [, clientName] [, windowTitle] [, actionButtonLabel] [, cancelButtonLabel] [, preferenceKey] [, popupExtension] [, eventProc] [, previewProc] [, filterProc] [, wanted] )
Post a dialog asking the user for a file to open, and return the file selected
or :const:`None` if the user cancelled. *message* is a text message to display,
*typeList* is a list of 4-char filetypes allowable, *defaultLocation* is the
pathname, :class:`FSSpec` or :class:`FSRef` of the folder to show initially,
*location* is the ``(x, y)`` position on the screen where the dialog is shown,
*actionButtonLabel* is a string to show instead of "Open" in the OK button,
*cancelButtonLabel* is a string to show instead of "Cancel" in the cancel
button, *wanted* is the type of value wanted as a return: :class:`str`,
:class:`FSSpec`, :class:`FSRef` and subtypes thereof are
acceptable.
.. index:: single: Navigation Services
For a description of the other arguments please see the Apple Navigation
Services documentation and the :mod:`EasyDialogs` source code.
.. function:: AskFileForSave( [message] [, savedFileName] [, defaultLocation] [, defaultOptionFlags] [, location] [, clientName] [, windowTitle] [, actionButtonLabel] [, cancelButtonLabel] [, preferenceKey] [, popupExtension] [, fileType] [, fileCreator] [, eventProc] [, wanted] )
Post a dialog asking the user for a file to save to, and return the file
selected or :const:`None` if the user cancelled. *savedFileName* is the default
for the file name to save to (the return value). See :func:`AskFileForOpen` for
a description of the other arguments.
.. function:: AskFolder( [message] [, defaultLocation] [, defaultOptionFlags] [, location] [, clientName] [, windowTitle] [, actionButtonLabel] [, cancelButtonLabel] [, preferenceKey] [, popupExtension] [, eventProc] [, filterProc] [, wanted] )
Post a dialog asking the user to select a folder, and return the folder selected
or :const:`None` if the user cancelled. See :func:`AskFileForOpen` for a
description of the arguments.
.. seealso::
`Navigation Services Reference <http://developer.apple.com/documentation/Carbon/Reference/Navigation_Services_Ref/>`_
Programmer's reference documentation for the Navigation Services, a part of the
Carbon framework.
.. _progressbar-objects:
ProgressBar Objects
-------------------
:class:`ProgressBar` objects provide support for modeless progress-bar dialogs.
Both determinate (thermometer style) and indeterminate (barber-pole style)
progress bars are supported. The bar will be determinate if its maximum value
is greater than zero; otherwise it will be indeterminate.
The dialog is displayed immediately after creation. If the dialog's "Cancel"
button is pressed, or if :kbd:`Cmd-.` or :kbd:`ESC` is typed, the dialog window
is hidden and :exc:`KeyboardInterrupt` is raised (but note that this response
does not occur until the progress bar is next updated, typically via a call to
:meth:`inc` or :meth:`set`). Otherwise, the bar remains visible until the
:class:`ProgressBar` object is discarded.
:class:`ProgressBar` objects possess the following attributes and methods:
.. attribute:: ProgressBar.curval
The current value (of type integer) of the progress bar. The
normal access methods coerce :attr:`curval` between ``0`` and :attr:`maxval`.
This attribute should not be altered directly.
.. attribute:: ProgressBar.maxval
The maximum value (of type integer) of the progress bar; the
progress bar (thermometer style) is full when :attr:`curval` equals
:attr:`maxval`. If :attr:`maxval` is ``0``, the bar will be indeterminate
(barber-pole). This attribute should not be altered directly.
.. method:: ProgressBar.title([newstr])
Sets the text in the title bar of the progress dialog to *newstr*.
.. method:: ProgressBar.label([newstr])
Sets the text in the progress box of the progress dialog to *newstr*.
.. method:: ProgressBar.set(value[, max])
Sets the progress bar's :attr:`curval` to *value*, and also :attr:`maxval` to
*max* if the latter is provided. *value* is first coerced between 0 and
:attr:`maxval`. The thermometer bar is updated to reflect the changes,
including a change from indeterminate to determinate or vice versa.
.. method:: ProgressBar.inc([n])
Increments the progress bar's :attr:`curval` by *n*, or by ``1`` if *n* is not
provided. (Note that *n* may be negative, in which case the effect is a
decrement.) The progress bar is updated to reflect the change. If the bar is
indeterminate, this causes one "spin" of the barber pole. The resulting
:attr:`curval` is coerced between 0 and :attr:`maxval` if incrementing causes it
to fall outside this range.
|
