Re: increase cell height in a GtkTreeView

["Kristian Rietveld" <kris gtk org>]

(Apologies for such a late reply, I hope it is still of use).

On Fri, Aug 1, 2008 at 11:37 AM, Nicolas Soubeiran
<nicolas soubeiran gmail com> wrote:
> Hi all,
> I need to create a treeview with a column which displays a pixbuf that
> becomes bigger when the user hovers the row. So I create a cellrenderer
> which display either the big pixbuf either the small pixbuf depending of the
> value of the GtkCellRendererState flag (if PRELIT then display big pixbuf,
> else small). It works except that the height of the cell is always the same
> so when the big pixbuf should be displayed, it is troncated.

Once a row got its size calculated and allocated, it will not change
unless the data in the model changes (signaled via row-changed).  When
GtkTreeView receives row-changed for a row, it will recalculate the
requested height for that row by re-querying the cell renderers.
Apart from this, cell renderers cannot influence the height of the
row.

> I want to know how to ask the cell to request more space. Currently I've
> copy/paste the render and get_size fonction of gtk_cell_renderer_pixbuf in
> my component.

The easiest solution is to emit the row-changed signal (using
gtk_tree_model_row_changed()) once the row has to update its height.


regards,

-kris.