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Re: Issues with dlgType

From: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
To: Dave Page <dpage(at)pgadmin(dot)org>
Cc: pgadmin-hackers <pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: Issues with dlgType
Date: 2010-10-22 12:02:38
Message-ID: 4CC17D5E.7060001@lelarge.info (view raw or flat)
Thread:
Lists: pgadmin-hackers
Le 22/10/2010 01:01, Dave Page a écrit :
> On Fri, Oct 22, 2010 at 12:29 AM, Guillaume Lelarge
> <guillaume(at)lelarge(dot)info> wrote:
>> Hi,
>>
>> I've found quite a few bugs in the way we handle the dlgType dialog, and
>> more to the point the Length and Precision textboxes. I use some time to
>> work on this on my 11 hour plane trip, and I have this patch. The big
>> issue I see is that it really contains a lot of changes. I'm not sure it
>> is appropriate to apply it on 1.12.
>>
>> Actually, I want to apply it on 1.12. But I would like to know what
>> others think about it.
> 
> Can you explain what the issues are please? Validating a patch against
> unknown intent isn't easy.
> 

I'll try. That's not really easy though.

All the bugs are related to composite types.

Let's say I add two members. First one is named c1, of type varchar(10),
and second one is an integer named c2. If I click on c1, I see a
datatype "character varying(10)" and a length of 10. Length textbox is
disabled, whereas it should be enabled because the composite type isn't
yet created and I should be able to change it. I also think that
datatype should display "character varying" (ie, without the length).
As the combobox is enabled, a user can think he could change the length
by typing it, but alas, put another length and the "Add/change" button
is suddenly disabled (because the "character varying(20)" is not part of
the cached type. You can of course get rid of the length to only have
"character varying", which is found in the types cache and which makes
the Length textbox enabled. I would say umbersome UI, don't you think.

But wait, there's more. Click on the integer member. The length textbox
still shows the length of the previous member you selected (and
precision too if you have one). Length and Precision textboxes are
disabled, but it still is a weird UI.

Now, let's add a third member, c3 of type numeric(10,5). Select the c1
member. Oh, Length textbox is still enabled. Precision textbox still
shows 2. Click on the c2 member, same behaviour (I have an integer
member with a length of 10 (remember the textbox is enabled), and a
disabled precision of 2. Now click again on the c1 member, and change
the size to 12. Click on the c2 member: Length enabled of value 12, and
Precision disabled of value 2. Weirder. Click on member c3: Length
enabled of value 12 (whereas it should be 10), Precision disabled of
value 2.

In fact, the datatype combobox always shows the good type, with length
and precision. The issue is that you need to change the text in the
combobox to make it look like before, and then change Length and
Precision to the correct ones, to be able to change the type. And you
have to forget the values in these textboxes when you select a member
because they usually are wrong.

So, what this patch does is to always put the good value in the textbox,
and to never change the datatype to something with length and precision.
And to make sure everything is enabled/disabled when they should be.


-- 
Guillaume
 http://www.postgresql.fr
 http://dalibo.com

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