Re: Discourse instance

[Neil McGovern]

On Sat, 2019-03-02 at 21:07 +, Philip Withnall wrote:
> Well, I suspect LRN would probably appreciate a ‘windows’ tag.

I've added a topic in Site Suggestions for these to collate them :)

Neil
-- 
Neil McGovern
Executive Director, The GNOME Foundation

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Re: Discourse instance

[Philip Withnall]

On Fri, 2019-03-01 at 19:34 +, Neil McGovern wrote:
> On Fri, 2019-03-01 at 20:37 +0300, LRN via gtk-devel-list wrote:
> > Well, what i mean is that i'd like to be able to be notified of
> > topics that are
> > relevant to me, and one way to do that is to allow topics to be
> > tagged and
> > allow people to subscribe to tags. 
> 
> Ah, yes. You can do that! 
> 
> https://discourse.gnome.org/tags/
> Click on a tag, and you can update your watching status. The number
> of
> tags are limited at the moment, so if you have any ideas for other
> tags
> you want to add, let me know and I'll add them.

Well, I suspect LRN would probably appreciate a ‘windows’ tag.

Philip

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Re: liststore issue 1 - iter points to wrong row after sort of column with cellrenderercombo

[Mike Martin via gtk-app-devel-list]

On Thu, 28 Feb 2019 at 18:05, Nicolas Soubeiran 
wrote:

> As you noticed "editing-started" is used at the beginning of editing a
> cell as the documentation states and is defined on the base class
> GtkCellRenderer:
>
> This signal gets emitted when a cell starts to be edited. The intended use
> of this signal is to do special setup on *editable* , e.g. adding a
> GtkEntryCompletion
>  or
> setting up additional columns in a GtkComboBox
> .
> https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html#GtkCellRenderer-editing-started
>
> While "edited" is only available on  GtkCellRendererText and is mainly to
> be used for "simple" edition of text (called when user validates
> https://developer.gnome.org/gtk3/stable/GtkCellRendererText.html#GtkCellRendererText-edited
> In case you have a GtkCellRendererText the signals will be called like
> this:
> - editing-started
> if user validates
>- edited with new_text the string the user entered
> else (user cancel edition)
>- editing-canceled
> In all cases you only have the path of the edited row, since the
> cellrenderer does not "know" the model it is displaying : you have to pass
> it through the signal user_data (then you can build the iter and do your
> edition code)
>
>
> Le jeu. 28 févr. 2019 à 18:43, Mike Martin  a écrit :
>
>> Thanks
>> Though what I don't quite get is the difference in behaviour between
>> editing-started and edited (both using path to get the ITER)
>> On my particular scenario I use editing-started to setup some stuff so I
>> can use the iter created
>>
>> On Thu, 28 Feb 2019, 12:30 Nicolas Soubeiran via gtk-app-devel-list, <
>> gtk-app-devel-list@gnome.org> wrote:
>>
>>> Hello,
>>> after you sort the model, you shall consider that all iter and path
>>> previously stored are wrong :
>>> A path is a representation of the position of the row in the current case
>>> (which you can read by using gtk_tree_path_to_string).
>>>
>>> https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-path-to-string
>>>
>>>  Iter are quite the same (but link to a particular GtkTreeModel), such as
>>> list::iterator of C++ STL : they are pointer to row that you can use to
>>> access to data or walk through the models.  You can make an iter from a
>>> path and a model :
>>>
>>> GtkTreePath *path;GtkTreeIter iter;
>>>
>>> GtkTreeModel* model;
>>>
>>> GtkListStore store = gtk_list_store_new(3, G_TYPE_INT,
>>> G_TYPE_STRING,G_TYPE_STRING)
>>>
>>> model = GTK_TREE_MODEL(store);
>>>
>>> path = gtk_tree_path_new_from_string
>>> <
>>> https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-path-new-from-string
>>> >
>>> ("3"); // third rowgtk_tree_model_get_iter
>>> <
>>> https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#gtk-tree-model-get-iter
>>> >
>>> (model, , path); // may be invalid (check return value)
>>>
>>>  If you really want to keep track of a particular row, you have to use
>>> GtkTreeRowReference
>>>
>>> https://developer.gnome.org/gtk3/stable/GtkTreeModel.html#GtkTreeRowReference
>>> But GTK will have to keep the reference up to date, so each time your
>>> model change (inserting, deleting, sorting...)
>>> GTK will triggered signal to update your GtkTreeRowReference which may
>>> cause an overhead in your application
>>>
>>> Hope this helps you to understand better the GtkTreeModel paradigm
>>> ___
>>> gtk-app-devel-list mailing list
>>> gtk-app-devel-list@gnome.org
>>> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>>>
>>

What I suspect is happening is that once a column is sorted, the column is
resorted as soon as a change is made so path never points to the current
row. Though doesn't happen with a plain text renderer.

I have tested this with my code, and this is exactly what is happening

Before the edited function is called, the liststore is sorted again, so the
path string points to the row that is now at the previous position (ie:the
next row)

If the change made does not mean the row is sorted to a different position
then the same row is referenced, example
(where the first is value in column 0 and second is a fixed row indicator)
in both cases this the first row

Sort reorders the rows
/data/staging -> /data/staging2
/data/1staging   2

Sort does not reorder row
/data/staging -> /data/1staging
/data/1staging   1


Mike
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