Just for the record, if anyone else hits this.
> I wrote:
> > I have a tree view with 3 columns, which sits within a scrolled
> > window.
> >
> > The middle column contains what can be quite a lengthy string.
> > When the user opens the window in question, I'd like her to be
> > visually aware that the third column is there: the problem is that
> > with the columns autosized, the length of the middle string can
> > push the third column out of the visible zone (you have to scroll
> > horizontally to reach it).
>
> > The ideal solution, I think, would be (a) set the starting width
> > of the middle column to some reasonable maximum (when the window
> > is first opened), but then (b) allow the user to expand it to read
> > the full string if need be.
Dave Howorth responded:
> If the user can be satisfied with seeing one complete string at a time,
> another option is to add a full-width label widget at the bottom of the
> window showing the content of the second column of the currently
> selected row. That avoids the need for the user to resize anything.
>
> Or add tooltips to the column.
I tried tooltips (well, a hand-rolled tooltip using gtk_window,
since the current gtk tooltips API doesn't work with treeview
cells), but it was a lot of work, and didn't really cut it.
For example, if the user maximizes the window on a big screen, we
_really_ don't want to artificially restrict the width of the big
second column, and only show its full content via an auxiliary
popup.
My solution: check the widths in the process of creating the
window. If the middle column is going to push the third column
into the non-visible zone, restrict its width with
gtk_tree_view_column_set_max_width(). But also -- and this makes
the whole thing work -- add a callback to motion-notify-event for
the treeview:
static gboolean
big_col_callback (GtkWidget *w,
GdkEventMotion *e,
gpointer p)
{
GtkTreeViewColumn *col =
gtk_tree_view_get_column(GTK_TREE_VIEW(w), 1);
if (gtk_tree_view_column_get_max_width(col) > 0) {
/* remove the width constraint */
gtk_tree_view_column_set_max_width(col, -1);
}
return FALSE;
}
The effect is that column 1 starts at a size that allows the third
column to be visible, but as soon as the user moves the mouse in
the treeview window, the column becomes freely resizable.
Allin Cottrell
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