Re: How to set a tool tip on a gtk_tree_store ?

[Kristian Rietveld <kris gtk org>]

On Mon, May 11, 2009 at 6:55 PM, Gregory Hosler <ghosler redhat com> wrote:
> The problem I'm facing is getting the GtkTooltip of a cell of the GtkTreeStore.

You should keep in mind that tooltips operate on GtkWidgets; a
GtkTreeStore is not a widget.  Instead you use the widget GtkTreeView
which displays the GtkTreeStore for you.

> I have read on gtk_tree_view_set_tooltip_cell(), but this requires me to
> identify the GtkTreePath (to identify the row) and GtkTreeViewColumn (to
> identify the column), and set the GtkTooltip. Again, I need a GtkTooltip.
>
> The GtkTooltip doesn't appear to have a "new" function, and only appears to be
> obtainable by setting the "has-tooltip" (which I would want to set on the cell),
> and then the invoked callback from the "query-tooltip" signal. The problem is
> that the private data will be different for each individual cell which has a
> tool tip.

GtkTooltip objects are always obtained in a query-tooltip callback,
you do not create them yourself.

The workflow for tooltips on tree views is basically:
1. Set has-tooltip to TRUE on the tree view widget and install a
query-tooltip signal handler.
2. In the signal handler you obtain the path and column/cell from the
given (x, y) coordinates.
3. Decide whether or not you want to display a tooltip for these coordinates.

See

http://git.gnome.org/cgit/gtk+/tree/tests/testtooltips.c

for a brief example.  (It uses gtk_tree_view_set_tooltip_row() though,
but it should get the point across and you'll then understand how to
substitute the usage of gtk_tree_view_set_tooltip_row() with
gtk_tree_view_set_tooltip_cell()).


regards,

-kris.