299 lines
11 KiB
TeX
299 lines
11 KiB
TeX
\section{Standard module \sectcode{EasyDialogs}}
|
|
\stmodindex{EasyDialogs}
|
|
|
|
The \code{EasyDialogs} module contains some simple dialogs for
|
|
the Macintosh, modelled after the \code{stdwin} dialogs with similar
|
|
names.
|
|
|
|
The \code{EasyDialogs} module defines the following functions:
|
|
|
|
\renewcommand{\indexsubitem}{(in module EasyDialogs)}
|
|
|
|
\begin{funcdesc}{Message}{str}
|
|
A modal dialog with the message text \var{str}, which should be at
|
|
most 255 characters long, is displayed. Control is returned when the
|
|
user clicks ``OK''.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{AskString}{prompt\optional{\, default}}
|
|
Ask the user to input a string value, in a modal dialog. \var{Prompt}
|
|
is the promt message, the optional \var{default} arg is the initial
|
|
value for the string. All strings can be at most 255 bytes
|
|
long. \var{AskString} returns the string entered or \code{None} in
|
|
case the user cancelled.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{AskYesNoCancel}{question\optional{\, default}}
|
|
Present a dialog with text \var{question} and three buttons labelled
|
|
``yes'', ``no'' and ``cancel''. Return \code{1} for yes, \code{0} for
|
|
no and \code{-1} for cancel. The default return value chosen by
|
|
hitting return is \code{0}. This can be changed with the optional
|
|
\var{default} argument.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{ProgressBar}{\optional{label\, maxval}}
|
|
Display a modeless progress dialog with a thermometer bar. \var{Label}
|
|
is the textstring displayed (default ``Working...''), \var{maxval} is
|
|
the value at which progress is complete (default 100). The returned
|
|
object has one method, \code{set(value)}, which sets the value of the
|
|
progress bar. The bar remains visible until the object returned is
|
|
discarded.
|
|
|
|
The progress bar has a ``cancel'' button, but it is currently
|
|
non-functional.
|
|
\end{funcdesc}
|
|
|
|
Note that \code{EasyDialogs} does not currently use the notification
|
|
manager. This means that displaying dialogs while the program is in
|
|
the background will lead to unexpected results and possibly
|
|
crashes. Also, all dialogs are modeless and hence expect to be at the
|
|
top of the stacking order. This is true when the dialogs are created,
|
|
but windows that pop-up later (like a console window) may also result
|
|
in crashes.
|
|
|
|
|
|
\section{Standard module \sectcode{FrameWork}}
|
|
\stmodindex{FrameWork}
|
|
|
|
The \code{FrameWork} module contains classes that together provide a
|
|
framework for an interactive Macintosh application. The programmer
|
|
builds an application by creating subclasses that override various
|
|
methods of the bases classes, thereby implementing the functionality
|
|
wanted. Overriding functionality can often be done on various
|
|
different levels, i.e. to handle clicks in a single dialog window in a
|
|
non-standard way it is not necessary to override the complete event
|
|
handling.
|
|
|
|
The \code{FrameWork} is still very much work-in-progress, and the
|
|
documentation describes only the most important functionality, and not
|
|
in the most logical manner at that. Examine the source or the examples
|
|
for more details.
|
|
|
|
The \code{FrameWork} module defines the following functions:
|
|
|
|
\renewcommand{\indexsubitem}{(in module FrameWork)}
|
|
|
|
\begin{funcdesc}{Application}{}
|
|
An object representing the complete application. See below for a
|
|
description of the methods. The default \code{__init__} routine
|
|
creates an empty window dictionary and a menu bar with an apple menu.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{MenuBar}{}
|
|
An object representing the menubar. This object is usually not created
|
|
by the user.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Menu}{bar\, title\optional{\, after}}
|
|
An object representing a menu. Upon creation you pass the
|
|
\code{MenuBar} the menu appears in, the \var{title} string and a
|
|
position (1-based) \var{after} where the menu should appear (default:
|
|
at the end).
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{MenuItem}{menu\, title\optional{\, shortcut\, callback}}
|
|
Create a menu item object. The arguments are the menu to crate the
|
|
item it, the item title string and optionally the keyboard shortcut
|
|
and a callback routine. The callback is called with the arguments
|
|
menu-id, item number within menu (1-based), current front window and
|
|
the event record.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Separator}{menu}
|
|
Add a separator to the end of a menu.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{SubMenu}{menu\, label}
|
|
Create a submenu named \var{label} under menu \var{menu}. The menu
|
|
object is returned.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{Window}{parent}
|
|
Creates a (modeless) window. \var{Parent} is the application object to
|
|
which the window belongs. The window is not displayed until later.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{DialogWindow}{parent}
|
|
Creates a modeless dialog window.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{windowbounds}{width\, height}
|
|
Return a \code{(left, top, right, bottom)} tuple suitable for creation
|
|
of a window of given width and height. The window will be staggered
|
|
with respect to previous windows, and an attempt is made to keep the
|
|
whole window on-screen. The window will however always be exact the
|
|
size given, so parts may be offscreen.
|
|
\end{funcdesc}
|
|
|
|
|
|
\subsection{Application objects}
|
|
Application objects have the following methods, among others:
|
|
|
|
\renewcommand{\indexsubitem}{(Application method)}
|
|
|
|
\begin{funcdesc}{makeusermenus}{}
|
|
Override this method if you need menus in your application. Append the
|
|
menus to \code{self.menubar}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{getabouttext}{}
|
|
Override this method to return a text string describing your
|
|
application. Alternatively, override the \code{do_about} method for
|
|
more elaborate about messages.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{mainloop}{\optional{mask\, wait}}
|
|
This routine is the main event loop, call it to set your application
|
|
rolling. \var{Mask} is the mask of events you want to handle,
|
|
\var{wait} is the number of ticks you want to leave to other
|
|
concurrent application (default 0, which is probably not a good
|
|
idea). This method does not return until \code{self} is raised.
|
|
|
|
The event loop is split into many small parts, each of which can be
|
|
overridden. The default methods take care of dispatching events to
|
|
windows and dialogs, handling drags and resizes, Apple Events, events
|
|
for non-FrameWork windows, etc.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_char}{c\, event}
|
|
The user typed character \var{c}. The complete details of the event
|
|
can be found in the \var{event} structure. This method can also be
|
|
provided in a \code{Window} object, which overrides the
|
|
application-wide handler if the window is frontmost.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_dialogevent}{event}
|
|
Called early in the event loop to handle modeless dialog events. The
|
|
default method simply dispatches the event to the relevant dialog (not
|
|
through the the \code{DialogWindow} object involved). Override if you
|
|
need special handling of dialog events (keyboard shortcuts, etc).
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{idle}{event}
|
|
Called by the main event loop when no events are available. The
|
|
null-event is passed (so you can look at mouse position, etc).
|
|
\end{funcdesc}
|
|
|
|
\subsection{Window Objects}
|
|
|
|
Window objects have the following methods, among others:
|
|
|
|
\renewcommand{\indexsubitem}{(Window method)}
|
|
|
|
\begin{funcdesc}{open}{}
|
|
Override this method to open a window. Store the MacOS window-id in
|
|
\code{self.wid} and call \code{self.do_postopen} to register the
|
|
window with the parent application.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{close}{}
|
|
Override this method to do any special processing on window
|
|
close. Call \code{self.do_postclose} to cleanup the parent state.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_postresize}{width\, height\, macoswindowid}
|
|
Called after the window is resized. Override if more needs to be done
|
|
than calling \code{InvalRect}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_contentclick}{local\, modifiers\, event}
|
|
The user clicked in the content part of a window. The arguments are
|
|
the coordinates (window-relative), the key modifiers and the raw
|
|
event.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_update}{macoswindowid\, event}
|
|
An update event for the window was received. Redraw the window.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_activate}{activate\, event}
|
|
The window was activated (\code{activate==1}) or deactivated
|
|
(\code{activate==0}). Handle things like focus highlighting, etc.
|
|
\end{funcdesc}
|
|
|
|
\subsection{ControlsWindow Object}
|
|
|
|
ControlsWindow objects have the following methods besides those of
|
|
\code{Window} objects:
|
|
|
|
\renewcommand{\indexsubitem}{(ControlsWindow method)}
|
|
|
|
\begin{funcdesc}{do_controlhit}{window\, control\, pcode\, event}
|
|
Part \code{pcode} of control \code{control} was hit by the
|
|
user. Tracking and such has already been taken care of.
|
|
\end{funcdesc}
|
|
|
|
\subsection{ScrolledWindow Object}
|
|
|
|
ScrolledWindow objects are ControlsWindow objects with the following
|
|
extra mathods:
|
|
|
|
\renewcommand{\indexsubitem}{(ScrolledWindow method)}
|
|
|
|
\begin{funcdesc}{scrollbars}{\optional{wantx\, wanty}}
|
|
Create (or destroy) horizontal and vertical scrollbars. The arguments
|
|
specify which you want (default: both). The scrollbars always have
|
|
minimum \code{0} and maximum \code{32767}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{getscrollbarvalues}{}
|
|
You must supply this method. It should return a tuple \code{x, y}
|
|
giving the current position of the scrollbars (between \code{0} and
|
|
\code{32767}). You can return \code{None} for either to indicate the
|
|
whole document is visible in that direction.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{updatescrollbars}{}
|
|
Call this method when the document has changed. It will call
|
|
\code{getscrollbarvalues} and update the scrollbars.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{scrollbar_callback}{which\, what\, value}
|
|
Supplied by you and called after user interaction. \code{Which} will
|
|
be \code{'x'} or \code{'y'}, \code{what} will be \code{'-'},
|
|
\code{'--'}, \code{'set'}, \code{'++'} or \code{'+'}. For
|
|
\code{'set'}, \code{value} will contain the new scrollbar position.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{scalebarvalues}{absmin\, absmax\, curmin\, curmax}
|
|
Auxiliary method to help you calculate values to return from
|
|
\code{getscrollbarvalues}. You pass document minimum and maximum value
|
|
and topmost (leftmost) and bottommost (rightmost) visible values and
|
|
it returns the correct number or \code{None}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_activate}{onoff\, event}
|
|
Takes care of dimming/highlighting scrollbars when a window becomes
|
|
frontmost vv. If you override this method call this one at the end of
|
|
your method.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_postresize}{width\, height\, window}
|
|
Moves scrollbars to the correct position. Call this method initially
|
|
if you override it.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_controlhit}{window\, control\, pcode\, event}
|
|
Handles scrollbar interaction. If you override it call this method
|
|
first, a nonzero return value indicates the hit was in the scrollbars
|
|
and has been handled.
|
|
\end{funcdesc}
|
|
|
|
\subsection{DialogWindow Objects}
|
|
|
|
DialogWindow objects have the following methods besides those of
|
|
\code{Window} objects:
|
|
|
|
\renewcommand{\indexsubitem}{(DialogWindow method)}
|
|
|
|
\begin{funcdesc}{open}{resid}
|
|
Create the dialog window, from the DLOG resource with id
|
|
\var{resid}. The dialog object is stored in \code{self.wid}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{do_itemhit}{item\, event}
|
|
Item number \var{item} was hit. You are responsible for redrawing
|
|
toggle buttons, etc.
|
|
\end{funcdesc}
|
|
|