RE: Gtk2: GtkCellRendererText: changing bgcolor based on..

["Erik Simonsen" <erik pinksheets com>]

You can, at the expense of some memory, make color management easier by just
using strings. This treeview has more than just a text column, but i hope
it's still clear--you can just leave out the columns you don't want. My
treeview just happens to need an icon as well.

enum{ 
        FILE_TREE_IMAGE_COLUMN, 
        FILE_TREE_TEXT_COLUMN, 
        FILE_TREE_DATA_COLUMN, 
        FILE_TREE_COLOR_COLUMN, 
        NUM_COLUMNS
};

    GtkWidget *tree;

    GtkTreeSelection *select;
    GtkTreeStore *playlist_store;

    GtkCellRenderer *text_renderer;
    GtkCellRenderer *pixbuf_renderer;
    GtkTreeViewColumn *column;


/*  I create a store with a an image column (that holds my pixbufs), a text column for the text, a pointer 
column that just holds my own data--you can ignore that--and a color column, that holds strings. */


    playlist_store =  gtk_tree_store_new (NUM_COLUMNS,
            GDK_TYPE_PIXBUF,    /*FILE_TREE_IMAGE_COLUMN*/
            G_TYPE_STRING,      /*FILE_TREE_TEXT_COLUMN*/
            G_TYPE_POINTER,     /*FILE_TREE_DATA_COLUMN*/
            G_TYPE_STRING        /*FILE_TREE_COLOR_COLUMN*/
            );

/* create the renderers-- The pixbuf renderer here is just because I needed an icon in my treeview, you can 
leave it out*/

    text_renderer = gtk_cell_renderer_text_new();
    pixbuf_renderer = gtk_cell_renderer_pixbuf_new();

    gtk_tree_view_column_pack_start(column, pixbuf_renderer, FALSE);
    gtk_tree_view_column_add_attribute (column, pixbuf_renderer, 
                                "pixbuf", FILE_TREE_IMAGE_COLUMN);

/* This will associate the background color of the text renderer with the Color column of my store */

    gtk_tree_view_column_pack_end(column, text_renderer, TRUE);

    gtk_tree_view_column_add_attribute (column, text_renderer, 
                                        "text", FILE_TREE_TEXT_COLUMN);

    gtk_tree_view_column_add_attribute (column, text_renderer, 
                                        "background", FILE_TREE_COLOR_COLUMN);

    gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(tree), FALSE);

 . . . 

/*When you add a row to the store, just add the color of the row as a string into that last column.  No need 
to deal with gdkcolors and allocations, etc.*/

    gtk_tree_store_set ( playlist_store, &iter,
        FILE_TREE_TEXT_COLUMN, "column text",
        FILE_TREE_IMAGE_COLUMN, minfo->icon,
        FILE_TREE_DATA_COLUMN, (gpointer) minfo,
        FILE_TREE_COLOR_COLUMN, "white",
        -1);

For the color column part, you can use several formats:  "white", "#202020", and i think "{ .4 .5 .2}" are 
all valid formats. easy peasy.

Hope this helped!

Erik Simonsen
homelessgoats.com

-----Original Message-----
From: gtk-app-devel-list-admin gnome org
[mailto:gtk-app-devel-list-admin gnome org]On Behalf Of Geert
Vanderkelen
Sent: Thursday, September 12, 2002 10:16 AM
To: gtk-app-devel
Subject: Gtk2: GtkCellRendererText: changing bgcolor based on..


Hi,

It's a GTK-2.0 question, so I'm not sure if I have to use this
mailinglist.. :)

Anyway. I have a GtkTreeView with a GtkListStore and such. It updates
every 300ms (query to database, get rows, show rows). It's a monitoring
system. It's running really great, and I'm not sure if I can make it
faster with other widgets.

To make it more appealing, the cells should have colors. Like a time
cell > 5 secs.. color red and so on.

Now, I can set the cell color with g_object_set().. But I want to do
this when updating the Store.. So on the fly a color where a column can
have let's say 5 different colors.. you know.
I tried to set the property in the iteration making the list, but I'm
not successful. Probably it is not placed correctly.

So, do I need to write a new GtkCellRenderer that can based on the value
the cell has, change it's backgroundcolor. Or can I do it with
GtkCellRendererText?
You know, a signal like 'changed' instead of 'edited' would be great :)


Thanks!

Geert


-- 
Geert Vanderkelen
Ypsilon.Net AG

http://www.ypsilon.net


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