Re: Gtk2::SimpleList

[muppet <scott asofyet org>]

On Sunday, May 30, 2004, at 08:38 PM, Daniel Kasak wrote:

> Right. I'm just getting to the point where I want to use TreeViews 
> with editable data.
> How do I know which row has been edited?
> I can call a sub when a row_changed signal is fired, but the sub only 
> received 2 things: the simplelist that triggered the signal, and a 
> Gtk2::Gdk::Event::Button ( whatever that is ).
> Am I supposed to do something with these to figure out which row has 
> changed?

no, it's a little more involved than that.

the row doesn't get edited; a cell gets edited.  to enable cell 
editing, you tell the cell renderer to allow editing.  the cell 
renderer fires a virtual function (not a signal) to start an editing 
operation, and that's all that the base class does.  CellRendererText 
creates a new editable and lets the user change the value in the 
editable, and fires a signal ("edited") when the editing operation is 
complete (e.g., the editable is destroyed).  this signal gets the path 
to the edited row, the new text, and the model; you already know which 
column you're in, because of which cell renderer is being used.

note that this process does *not* automatically apply the new value!  
SimpleList attaches an "edited" handler to all "text" columns' cell 
renderers, and that handler applies the new data to the model (see 
text_cell_edited() in SimpleList.pm).

SimpleList's editable cell support is designed for cases in which you 
set up the list when you create a dialog, let the user edit it, and 
then pull all the data out when the user closes the dialog; thus, what 
you're wanting do to requires more magic^Wdirect usage of the TreeView.

if you want to trigger something after the value has been set, or if 
you want validate that data and possibly inhibit applying, then you to 
do fancy stuff with those signals (in which case simplelist may be 
getting in your way).  if you want to do validation *while* the user 
edits, you need a custom cell renderer in which you can do your own 
editing.  (it is rather easy to get SimpleList to use custom renderers, 
by creating new column types.)


Remember -- SimpleList is designed for Simple applications.  You appear 
to be leaving SimpleLand at full speed.  Are you sure you still want to 
use SimpleList or just use TreeView and ListStore directly?


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