Re: How to align columns in a GtkTreeView widget?

[Boszormenyi Zoltan <zboszor freemail hu>]

Sorry for the previous badly formed post.

Again, replying to myself and cc'd to devel list because
no one replied on gtk-list.

Boszormenyi Zoltan wrote:

> Hi,
>
> I am experimenting with GTK 2.2.1 on a RedHat 9 system.
>
> I am reading the GTK2+ API examples and have come to this problem:
> I want to display int and double values in a column aligned to the right
> and I want to override the default format string from "%lf" to "%.2lf".
>
> I am doing this (following line-by-line the API doc example):
>
>   GtkTreeIter   iter;
>
>   items = gtk_list_store_new (N_ITEMS,
>           G_TYPE_STRING, G_TYPE_STRING,
>           G_TYPE_BOOLEAN, G_TYPE_INT,
>           G_TYPE_DOUBLE, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
>
>   /* just an example line to see something */
>   gtk_list_store_append (items, &iter);
>   gtk_list_store_set (items, &iter,
>       ITEM_BARCODE, "1234567890128",
>       ITEM_NAME, "Example",
>       ITEM_STORNO, FALSE,    /* not displayed column */
>       ITEM_COLLECTOR, 1,
>       ITEM_MULTIPLIER, 2.25,
>       ITEM_PRICE, 27.0,
>       ITEM_TOTAL, 2.25*27.0,
>       -1);
>
>   myview = GTK_TREE_VIEW(lookup_widget(window1, "treeview1"));
>   gtk_tree_view_set_model(myview, GTK_TREE_MODEL(items));
>   renderer = gtk_cell_renderer_text_new();
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Barcode", renderer,
>       "text", ITEM_BARCODE,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 110);
>   gtk_tree_view_column_set_max_width (column, 110);
>   gtk_tree_view_column_set_fixed_width (column, 110);
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Name", renderer,
>       "text", ITEM_NAME,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 160);
>   gtk_tree_view_column_set_max_width (column, 160);
>   gtk_tree_view_column_set_fixed_width (column, 160);
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Collector", renderer,
>       "text", ITEM_COLLECTOR,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 45);
>   gtk_tree_view_column_set_max_width (column, 45);
>   gtk_tree_view_column_set_fixed_width (column, 45);
>   gtk_tree_view_column_set_alignment (column, 1.0);
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Multiplier", renderer,
>       "text", ITEM_MULTIPLIER,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 60);
>   gtk_tree_view_column_set_max_width (column, 60);
>   gtk_tree_view_column_set_fixed_width (column, 60);
>   gtk_tree_view_column_set_alignment (column, 1.0);
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Price", renderer,
>       "text", ITEM_PRICE,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 90);
>   gtk_tree_view_column_set_max_width (column, 90);
>   gtk_tree_view_column_set_fixed_width (column, 90);
>   gtk_tree_view_column_set_alignment (column, 1.0);
>
>   column = gtk_tree_view_column_new_with_attributes(
>       "Total", renderer,
>       "text", ITEM_TOTAL,
>       NULL);
>   gtk_tree_view_append_column (GTK_TREE_VIEW(myview), column);
>   gtk_tree_view_column_set_min_width (column, 90);
>   gtk_tree_view_column_set_max_width (column, 90);
>   gtk_tree_view_column_set_fixed_width (column, 90);
>   gtk_tree_view_column_set_alignment (column, 1.0);
>
> What I get is the GtkTreeView widget's labels are aligned to the right
> in the columns where I set but the values are not. Is it OK to use the
> same GtkCellRendererText for all the columns? Or should I have to
> use different renderers for differently formatted columns? 


So it is compulsory to use different renderers for differently formatted 
columns.
because gtk_tree_view_column_new_with_attributes() is setting the attributes
of the renderer, not the column. Rereading the documentation made it clear.

> Also, how to override the format string of a GtkCellRendererText 
> displaying numeric (int, float, double) values? 


This question still stands.

> Best regards,
> Zoltán Böszörményi