Re: Setting tree view column attributes from its signal handler

["Diego Jacobi" <jacobidiego gmail com>]

---------- Forwarded message ----------
From: Diego Jacobi <jacobidiego gmail com>
Date: 03-abr-2008 12:53
Subject: Re: Setting tree view column attributes from its signal handler
To: Ian Puleston <ian underpressuredivers com>

Maybe you have to call a refresh or repaint method on the entire treeview.
I understand that to be optimal and save cpu time, the treeview only redraws the current and affected row, and not all the data in the screen as some other toolkits does.

It seems like what you need is a spreadsheet or a grid. I am not sure if you will be able to do it with the treeview.
A GtkTableView where each cell is processed separatedly of the column, like in wxWidgets or the Borland Grid component will fit better this, but it sadly doesnt exists in gtk yet.

Look at gtkextra.sourceforge.net, this proyect have a gtksheet widget, i have not tested it but it could work for you.

Cheers.

2008/4/3, Ian Puleston <ian underpressuredivers com>:

Hi,

Any ideas on this? I have a tree view that pops-up a menu when the user
double-clicks in a cell. The menu has options both for the selected row and
the selected column, but on this event the tree view highlights the selected
row, so I wanted to try to highlight the selected column too. The following
is what I tried to do in the tree view's "row-activated" signal handler:

void treeViewClickHandler(GtkTreeView *treeView, GtkTreePath *rowPath,
                          GtkTreeViewColumn *column, gpointer data)
{
    GtkWidget       *colsMenu = data;
    GtkCellRenderer *renderer;
    GList           *cellList;
    int             i;

    g_assert(GTK_IS_MENU(colsMenu));

    cellList = gtk_tree_view_column_get_cell_renderers(column);
    for (i = 0; (renderer = g_list_nth_data(cellList, i)) != NULL; i++)
    {
        g_object_set(G_OBJECT(renderer), "background", "blue", NULL);
    }
    g_list_free(cellList);

    gtk_menu_popup(GTK_MENU(colsMenu), NULL, NULL, NULL, NULL,
                   0, gtk_get_current_event_time());
}

This nearly worked, but the background color doesn't get rendered. It
actually appears in the cells of the column as I subsequently move the mouse
over them. So I tried adding this after the g_object_set to try to get the
column's cells to render:

        gtk_cell_renderer_get_size(renderer, GTK_WIDGET(column), &cellArea,
                                   &xOff, &yOff, &width, &height);
        gtk_cell_renderer_render(renderer, GTK_WIDGET(column)->window,
                                 GTK_WIDGET(column),
                                 &cellArea, &cellArea, &cellArea,
                                 GTK_CELL_RENDERER_SELECTED);

But that did nothing. I also tried removing the menu popup line and it still
behaves the same, so it's not caused by displaying the menu. But I call
similar code to change attributes of a column  later in the signal handler
for the menu, and that works fine.

Can anyone see anything that I'm doing wrong here?

Ian


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