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266 lines
11 KiB
TeX
266 lines
11 KiB
TeX
\section{\module{EasyDialogs} ---
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Basic Macintosh dialogs}
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\declaremodule{standard}{EasyDialogs}
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\platform{Mac}
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\modulesynopsis{Basic Macintosh dialogs.}
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The \module{EasyDialogs} module contains some simple dialogs for the
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Macintosh. All routines take an optional resource ID parameter \var{id}
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with which one can override the \constant{DLOG} resource used for the
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dialog, provided that the dialog items correspond (both type and item
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number) to those in the default \constant{DLOG} resource. See source
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code for details.
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The \module{EasyDialogs} module defines the following functions:
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\begin{funcdesc}{Message}{str\optional{, id\optional{, ok}}}
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Displays a modal dialog with the message text \var{str}, which should be
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at most 255 characters long. The button text defaults to ``OK'', but is
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set to the string argument \var{ok} if the latter is supplied. Control
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is returned when the user clicks the ``OK'' button.
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\end{funcdesc}
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\begin{funcdesc}{AskString}{prompt\optional{, default\optional{,
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id\optional{, ok\optional{, cancel}}}}}
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Asks the user to input a string value via a modal dialog. \var{prompt}
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is the prompt message, and the optional \var{default} supplies the
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initial value for the string (otherwise \code{""} is used). The text of
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the ``OK'' and ``Cancel'' buttons can be changed with the \var{ok} and
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\var{cancel} arguments. All strings can be at most 255 bytes long.
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\function{AskString()} returns the string entered or \constant{None}
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in case the user cancelled.
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\end{funcdesc}
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\begin{funcdesc}{AskPassword}{prompt\optional{, default\optional{,
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id\optional{, ok\optional{, cancel}}}}}
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Asks the user to input a string value via a modal dialog. Like
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\function{AskString()}, but with the text shown as bullets. The
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arguments have the same meaning as for \function{AskString()}.
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\end{funcdesc}
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\begin{funcdesc}{AskYesNoCancel}{question\optional{, default\optional{,
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yes\optional{, no\optional{, cancel\optional{, id}}}}}}
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Presents a dialog with prompt \var{question} and three buttons labelled
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``Yes'', ``No'', and ``Cancel''. Returns \code{1} for ``Yes'', \code{0}
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for ``No'' and \code{-1} for ``Cancel''. The value of \var{default} (or
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\code{0} if \var{default} is not supplied) is returned when the
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\kbd{RETURN} key is pressed. The text of the buttons can be changed with
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the \var{yes}, \var{no}, and \var{cancel} arguments; to prevent a button
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from appearing, supply \code{""} for the corresponding argument.
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\end{funcdesc}
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\begin{funcdesc}{ProgressBar}{\optional{title\optional{, maxval\optional{,
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label\optional{, id}}}}}
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Displays a modeless progress-bar dialog. This is the constructor for the
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\class{ProgressBar} class described below. \var{title} is the text
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string displayed (default ``Working...''), \var{maxval} is the value at
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which progress is complete (default \code{0}, indicating that an
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indeterminate amount of work remains to be done), and \var{label} is
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the text that is displayed above the progress bar itself.
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\end{funcdesc}
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\begin{funcdesc}{GetArgv}{\optional{optionlist\optional{
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commandlist\optional{, addoldfile\optional{, addnewfile\optional{,
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addfolder\optional{, id}}}}}}}
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Displays a dialog which aids the user in constructing a command-line
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argument list. Returns the list in \code{sys.argv} format, suitable for
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passing as an argument to \function{getopt.getopt()}. \var{addoldfile},
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\var{addnewfile}, and \var{addfolder} are boolean arguments. When
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nonzero, they enable the user to insert into the command line paths to
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an existing file, a (possibly) not-yet-existent file, and a folder,
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respectively. (Note: Option arguments must appear in the command line
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before file and folder arguments in order to be recognized by
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\function{getopt.getopt()}.) Arguments containing spaces can be
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specified by enclosing them within single or double quotes. A
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\exception{SystemExit} exception is raised if the user presses the
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``Cancel'' button.
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\var{optionlist} is a list that determines a popup menu from which the
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allowed options are selected. Its items can take one of two forms:
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\var{optstr} or \code{(\var{optstr}, \var{descr})}. When present,
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\var{descr} is a short descriptive string that is displayed in the
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dialog while this option is selected in the popup menu. The
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correspondence between \var{optstr}s and command-line arguments is:
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\begin{tableii}{l|l}{textrm}{\var{optstr} format}{Command-line format}
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\lineii{\code{x}}
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{\programopt{-x} (short option)}
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\lineii{\code{x:} or \code{x=}}
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{\programopt{-x} (short option with value)}
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\lineii{\code{xyz}}
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{\longprogramopt{xyz} (long option)}
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\lineii{\code{xyz:} or \code{xyz=}}
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{\longprogramopt{xyz} (long option with value)}
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\end{tableii}
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\var{commandlist} is a list of items of the form \var{cmdstr} or
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\code{(\var{cmdstr}, \var{descr})}, where \var{descr} is as above. The
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\var{cmdstr}s will appear in a popup menu. When chosen, the text of
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\var{cmdstr} will be appended to the command line as is, except that a
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trailing \character{:} or \character{=} (if present) will be trimmed
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off.
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\versionadded{2.0}
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\end{funcdesc}
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\begin{funcdesc}{AskFileForOpen}{
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\optional{message}
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\optional{, typeList}
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\optional{, defaultLocation}
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\optional{, defaultOptionFlags}
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\optional{, location}
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\optional{, clientName}
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\optional{, windowTitle}
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\optional{, actionButtonLabel}
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\optional{, cancelButtonLabel}
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\optional{, preferenceKey}
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\optional{, popupExtension}
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\optional{, eventProc}
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\optional{, previewProc}
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\optional{, filterProc}
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\optional{, wanted}
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}
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Post a dialog asking the user for a file to open, and return the file
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selected or \constant{None} if the user cancelled.
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\var{message} is a text message to display,
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\var{typeList} is a list of 4-char filetypes allowable,
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\var{defaultLocation} is the pathname, \class{FSSpec} or \class{FSRef}
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of the folder to show initially,
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\var{location} is the \code{(x, y)} position on the screen where the
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dialog is shown,
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\var{actionButtonLabel} is a string to show instead of ``Open'' in the
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OK button,
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\var{cancelButtonLabel} is a string to show instead of ``Cancel'' in the
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cancel button,
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\var{wanted} is the type of value wanted as a return: \class{str},
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\class{unicode}, \class{FSSpec}, \class{FSRef} and subtypes thereof are
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acceptable.
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\index{Navigation Services}
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For a description of the other arguments please see the Apple Navigation
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Services documentation and the \module{EasyDialogs} source code.
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\end{funcdesc}
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\begin{funcdesc}{AskFileForSave}{
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\optional{message}
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\optional{, savedFileName}
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\optional{, defaultLocation}
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\optional{, defaultOptionFlags}
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\optional{, location}
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\optional{, clientName}
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\optional{, windowTitle}
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\optional{, actionButtonLabel}
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\optional{, cancelButtonLabel}
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\optional{, preferenceKey}
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\optional{, popupExtension}
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\optional{, fileType}
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\optional{, fileCreator}
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\optional{, eventProc}
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\optional{, wanted}
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}
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Post a dialog asking the user for a file to save to, and return the
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file selected or \constant{None} if the user cancelled.
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\var{savedFileName} is the default for the file name to save to (the
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return value). See \function{AskFileForOpen()} for a description of
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the other arguments.
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\end{funcdesc}
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\begin{funcdesc}{AskFolder}{
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\optional{message}
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\optional{, defaultLocation}
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\optional{, defaultOptionFlags}
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\optional{, location}
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\optional{, clientName}
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\optional{, windowTitle}
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\optional{, actionButtonLabel}
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\optional{, cancelButtonLabel}
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\optional{, preferenceKey}
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\optional{, popupExtension}
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\optional{, eventProc}
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\optional{, filterProc}
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\optional{, wanted}
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}
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Post a dialog asking the user to select a folder, and return the
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folder selected or \constant{None} if the user cancelled. See
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\function{AskFileForOpen()} for a description of the arguments.
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\end{funcdesc}
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\begin{seealso}
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\seetitle
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[http://developer.apple.com/documentation/Carbon/Reference/Navigation_Services_Ref/]
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{Navigation Services Reference}{Programmer's reference documentation
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for the Navigation Services, a part of the Carbon framework.}
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\end{seealso}
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\subsection{ProgressBar Objects \label{progressbar-objects}}
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\class{ProgressBar} objects provide support for modeless progress-bar
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dialogs. Both determinate (thermometer style) and indeterminate
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(barber-pole style) progress bars are supported. The bar will be
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determinate if its maximum value is greater than zero; otherwise it
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will be indeterminate.
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\versionchanged[Support for indeterminate-style progress bars was
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added]{2.2}
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The dialog is displayed immediately after creation. If the dialog's
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``Cancel'' button is pressed, or if \kbd{Cmd-.} or \kbd{ESC} is typed,
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the dialog window is hidden and \exception{KeyboardInterrupt} is
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raised (but note that this response does not occur until the progress
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bar is next updated, typically via a call to \method{inc()} or
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\method{set()}). Otherwise, the bar remains visible until the
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\class{ProgressBar} object is discarded.
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\class{ProgressBar} objects possess the following attributes and
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methods:
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\begin{memberdesc}[ProgressBar]{curval}
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The current value (of type integer or long integer) of the progress
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bar. The normal access methods coerce \member{curval} between
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\code{0} and \member{maxval}. This attribute should not be altered
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directly.
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\end{memberdesc}
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\begin{memberdesc}[ProgressBar]{maxval}
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The maximum value (of type integer or long integer) of the progress
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bar; the progress bar (thermometer style) is full when \member{curval}
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equals \member{maxval}. If \member{maxval} is \code{0}, the bar will
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be indeterminate (barber-pole). This attribute should not be altered
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directly.
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\end{memberdesc}
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\begin{methoddesc}[ProgressBar]{title}{\optional{newstr}}
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Sets the text in the title bar of the progress dialog to
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\var{newstr}.
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\end{methoddesc}
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\begin{methoddesc}[ProgressBar]{label}{\optional{newstr}}
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Sets the text in the progress box of the progress dialog to
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\var{newstr}.
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\end{methoddesc}
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\begin{methoddesc}[ProgressBar]{set}{value\optional{, max}}
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Sets the progress bar's \member{curval} to \var{value}, and also
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\member{maxval} to \var{max} if the latter is provided. \var{value}
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is first coerced between 0 and \member{maxval}. The thermometer bar
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is updated to reflect the changes, including a change from
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indeterminate to determinate or vice versa.
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\end{methoddesc}
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\begin{methoddesc}[ProgressBar]{inc}{\optional{n}}
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Increments the progress bar's \member{curval} by \var{n}, or by \code{1}
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if \var{n} is not provided. (Note that \var{n} may be negative, in
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which case the effect is a decrement.) The progress bar is updated to
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reflect the change. If the bar is indeterminate, this causes one
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``spin'' of the barber pole. The resulting \member{curval} is coerced
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between 0 and \member{maxval} if incrementing causes it to fall
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outside this range.
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\end{methoddesc}
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