117 lines
4.2 KiB
Text
117 lines
4.2 KiB
Text
.SH
|
|
Module flp
|
|
.LP
|
|
The flp module loads fl-forms from fd files, as generated
|
|
by fdesign. The module is designed to be flexible enough to allow
|
|
almost anything to be done with the loaded form.
|
|
.LP
|
|
Loadform defines
|
|
two types of functions: functions to parse fd files and functions to
|
|
create the forms from the templates returned by the parse functions.
|
|
There are fairly low-level create functions that create single objects,
|
|
and convenience routines that create complete forms, including callbacks,
|
|
etc.
|
|
.LP
|
|
The exception flp.error is raised whenever an error occurs while parsing a forms
|
|
definition file or creating a form.
|
|
.SH 2
|
|
Parsing functions
|
|
.LP
|
|
There are two parsing functions, parse_form() and parse_forms(). They
|
|
take the following form:
|
|
.LP
|
|
.ft C
|
|
ftuple = parse_form(filename, formname)
|
|
.br
|
|
ftdict = parse_forms(filename)
|
|
.IP
|
|
Parse_form parses a single form, and returns a tuple (ftmp, otmplist).
|
|
Ftmp is a template for a form, otmplist is a list of templates for
|
|
objects. See below for a description of these templates.
|
|
.IP
|
|
Parse_forms parses all forms in an fd file. It returns a dictionary of
|
|
(ftmp, otmplist) tuples, indexed by formname.
|
|
.IP
|
|
Filename is the name of the forms definition file to inspect. The functions
|
|
appends '.fd' if needed, and use 'sys.path' to locate the file.
|
|
.IP
|
|
formname is the name of the form to load. This argument is mandatory,
|
|
even if the file only contains one form.
|
|
.LP
|
|
The form template and object template are structures that contain all
|
|
the information read from the fd file, in 'natural' form. A form
|
|
template record contains the following fields:
|
|
.IP
|
|
.nf
|
|
"Name", the name of the form;
|
|
"Width", the width of the form;
|
|
"Height", the height of the form; and
|
|
"Numberofobjects", the number of objects in the form.
|
|
.LP
|
|
An object template contains the following fields:
|
|
.IP
|
|
.nf
|
|
"Class", the class of object (eg. FL.BUTTON);
|
|
"Type", the sub-class (eg. FL.NORMALBUTTON);
|
|
"Box", a list with four members: [x, y, width, height];
|
|
"Boxtype", the type of box (eg. FL.DOWNBOX);
|
|
"Colors", a list with the two object colors;
|
|
"Alignment", the label alignment (eg. FL.ALIGNLEFT);
|
|
"Style", the label style (eg. FL.BOLDSTYLE);
|
|
"Lcol", the label color;
|
|
"Label", a string containing the label;
|
|
"Name", a string containing the name of the object;
|
|
"Callback", a string containing the callback routine name; and
|
|
"Argument", a string containing the callback routine extra argument.
|
|
.SH
|
|
Low-level create routines.
|
|
.LP
|
|
The three low-level creation routines are called as follows:
|
|
.LP
|
|
.ft C
|
|
form = create_form(form_template)
|
|
.IP
|
|
Create an fl form from a form template. Returns the form created.
|
|
.LP
|
|
.ft C
|
|
obj = create_object(form, obj_template)
|
|
.IP
|
|
Create an object in an fl form. Return the new object.
|
|
An error is raised if the object has a callback routine.
|
|
.SH
|
|
High-level create routines.
|
|
.LP
|
|
The 'standard' way to handle forms in python is to define a class
|
|
that contains the form and all the objects (insofar as they are named),
|
|
and that defines all the callback functions, and use an instance of
|
|
this class to handle the form interaction.
|
|
Flp contains three routines that simplify handling this paradigm:
|
|
.LP
|
|
.ft C
|
|
create_full_form(instance, ftuple)
|
|
.IP
|
|
This routine takes an instance of your form-handling class and an
|
|
ftuple (as returned by the parsing routines) as parameters. It inserts
|
|
the form into the instance, defines all object names and arranges that
|
|
the callback methods are called. All the names inserted into the
|
|
instance are the same as the names used for the objects, etc. in the
|
|
fd file.
|
|
.LP
|
|
.ft C
|
|
merge_full_form(instance, form, ftuple)
|
|
.IP
|
|
This function does the same as create_full_form, only it does not create
|
|
the form itself nor the 'background box' that fdesign automatically
|
|
adds to each form. This is useful if your class inherits a superclass
|
|
that already defines a skeleton form (with 'OK' and 'Cancel' buttons,
|
|
for instance), and you want to merge the new form into that existing
|
|
form. The 'form' parameter is the form to which the new objects are
|
|
added.
|
|
.LP
|
|
If you use the paradigm sketched here but need slightly more control
|
|
over object creation there is a routine that creates a single object
|
|
and inserts its name (and arranges for the callback routine to be
|
|
called):
|
|
.LP
|
|
.ft C
|
|
create_object_instance(instance, form, obj_template)
|