I am sorry if I sounded upset with you in my replies. I'm frustrated, and that probably came out in my tone. I didn't intend to be rude, especially not to someone who is trying to help. If I was impolite, or rude, or wrote inappropriately, I am truly sorry. It was not my intent to be rude and I hope you will accept my apology.

Sadly, I am forced to develop on and for Windows, so I can't use the memory leak monitor. Platform issues notwithdstanding, it looks like it would be handy. I might be able to find a way to tweak it for windows. If I do, I'll post a reply to that node.

Part of the problem is that I need to have a lot of dynamism in which widgets are displayed.

To try to better explain what I'm doing, I'll break it down into smaller pieces--it may help to refer to the ASCII art in my OP. I need to display a list of clauses and allow the user to edit them. The interface is much like the one used by thunderbird to create mail filters. Each clause consists of a field name, an operator, and a value. Different fields have different lists of legal operators. Different fields also have different rules about what values are acceptable. For example, we have several temperature fields which have any number for their values; I use an entry for value entry. We also have a Wet/Dry field that can be only "Wet or Trace" or "Dry"; I use an option menu. If the user changes the field from TEMP to WD, then the value widget must be changed from an Entry to an Optionmenu and the operator Optionmenu must be changed to display the correct list or operations (you can't very well check to see if something is "less than or equal to" Wet). It's also worth noting that I may be working with any number of clauses, and I need to able to add or delete them as needed.

I hade hoped to handle all this dynamism by creating and destroying the involved widgets and HList entries as needed. It looks like I can't do anything to cleanly expungethe widgets and entries though--even if I explicitly destroy my widgets, destroy my objects and delete my entries.

So, to implement a cached-entry approach to my problem, I'll need to create a set of HList items that have the different possible widgets. When the user changes the field value, I will need to decide if I need to hide the current Hlist entry, uncouple it from my Clause object and configure an HList entry with the correct widget set to display the clause. Is that correct?

I'll take a look at the TableMatrix widget. Thank you for the suggestions.


TGI says moo

In reply to Re^4: Tk, HLists and memory leakage by TGI
in thread Tk, HLists and memory leakage by TGI

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