Re: On treeviews and custom treemodels again

[Stefan Kost <ensonic hora-obscura de>]

Hi Denis,

you might want to read over your mail and be a bit clearer. The probelm 
is not really understandable to me.

Stefan

> Hi !
>
> After some investigation here are my conclusions :
>
> When one's implements its own GtkTreeModel, he has 2 solutions to tell 
> the cell_renderers what to "render" :
>
> 1. put a property on the object which is given in the GValue given by
>     
> gtk_tree_model_get_value 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html#gtk-tree-model-get-value> 
> (GtkTreeModel 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html> 
> *tree_model,
>                          GtkTreeIter 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html#GtkTreeIter> 
> *iter,
>                          gint 
> <http://wallis/docs/linux/gtk/reference/gtk/glib/glib-Basic-Types.html#gint> 
> column,
>                          GValue 
> <http://wallis/docs/linux/gtk/reference/gtk/gobject/gobject-Generic-values.html#GValue> 
> *value);
>
> 2. use a void (*GtkTreeCellDataFunc 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeViewColumn.html#GtkTreeCellDataFunc>) 
> (GtkTreeViewColumn 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeViewColumn.html> 
> *tree_column,
>                                      GtkCellRenderer 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkCellRenderer.html> 
> *cell,
>                                      GtkTreeModel 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html> 
> *tree_model,
>                                      GtkTreeIter 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html#GtkTreeIter> 
> *iter,
>                                      gpointer 
> <http://wallis/docs/linux/gtk/reference/gtk/glib/glib-Basic-Types.html#gpointer> 
> data);
>
> Now the problem is that when you use the second solution, you cannot 
> control the layout of the cell_renderers for on column (you only have 
> one function to set it :
>
>      gtk_tree_view_column_set_cell_data_func () )
>
>
> Now my problem is that I want to 2 cell renderers and for the FIRST 
> one, I want to put the boolean expand of the function
>
> void        gtk_tree_view_column_pack_start 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeViewColumn.html#gtk-tree-view-column-pack-start> 
> (GtkTreeViewColumn 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeViewColumn.html> 
> *tree_column,
>                                             GtkCellRenderer 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkCellRenderer.html> 
> *cell,
>                                             gboolean 
> <http://wallis/docs/linux/gtk/reference/gtk/glib/glib-Basic-Types.html#gboolean> 
> expand);
>
> to FALSE and I cannot do it with the solution 2. because the way to 
> provide this boolean does not exists in the API :-(
>
> So I should use solution 2 BUT :
> I do not want to put properties specific to gui stuff on my data model 
> so I should introduce an Object returned by gtk_tree_model_get_value 
> <http://wallis/docs/linux/gtk/reference/gtk/html/GtkTreeModel.html#gtk-tree-model-get-value> 
> which contains the real object
> Is there a solution that I do not see to solve my problem ?
>
> Denis
>
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