On 27-sep-06, at 18:29, CV wrote:
On Sep 27, 2006, at 8:17 AM, Bart Pietercil wrote:
Hi,
this worked:
defined and filled CurrentStudentRecord as a Dictionary having the
DBColumnName as Key
defined a subclass from editfield named sqlite_field
with an extra property DBColumnName
added an interface to the class with a DisplayStudentInfo method
defined App.StudentFields() As sqlite_fields
in the change event of my listbox the code
for i = 0 to Ubound(App.StudentFields)
App.StudentFields(i).DisplayInfo
next
updates all the sqlite_fields with their appropriate values
JOY
now I want to add some popupmenus to the dance
so I subclassed a popupmenu as sqlite_pumenu that interfaces with
the DisplayStudentInfo method
-------
this does not work and where I am at lost
I cannot add my sqlite_pumenu's to App.StudentFields (it is not a
sqlite_field)
I changed the StudentFieldsArray to type Control. This seems to
work as RB does not complain when I add the sqlite_xxxx to the array.
However RB does not accept the line App.StudentsFields
(i).Displayinfo . This line only seems to work when the array is
of type sqlite_field
At this point you should be able to cast to expose the subclass
functionality: Sqlite_field(App.StudentsFields(i)).DisplayInfo,
since, as I understand it, App.StudentsFields(i) of data type
Control is actually a Sqlite_field.
Although I hadn't thought about casting this seems to be defying the
purpose since what I want to achieve is an array consisting of
several kinds of controls
(editfields,popupmenu,radios,checkboxes,....) which share (through
the interface) the DisplayInfo method. In this way I hoped to avoid a
lot of "cases" and "Isa's"; If I am to follow your lead on this, I
would still have to introduce "isa sqlite_pumenu" or "isa
sqlite_field" checking , wouldn't I ?
Perhaps a dictionary would be a better design choice than any
array, however.
I've been thinking about this. Since I have already a dictionary
representing the SelectedStudent (key = DBColumnName, Value =
DBValue), I could make a "mirroring" Dictionary built on DBColumnname
and the object representing the info on screen. But wouldnt I still
need to cast ? Or should this work:
myDict.Value("DBColumnName").DisplayInfo ?
Thanks for bearing with me
Bart
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