On 6/1/07, David Nečas (Yeti) <[EMAIL PROTECTED]> wrote: > On Fri, Jun 01, 2007 at 03:47:36PM +0100, Nuno Lucas wrote: > > > > > > You have to derive your own GtkTreeModel, if the predefined GtkListStore > > > or GtkTreeStore are not sufficient (They simply stores all data at once). > > > > I may be missing something, but I don't see a way to set the number of > > "virtual" rows. > > See http://gwyddion.net/documentation/head/libgwydgets/GwyNullStore.php > for a simple purely virtual store. This is a cheap hack, > but it demonstrates the point IMO.
Thanks! That is exactly the kind of sample I needed to look at! > > From what I see in the documentation, the only way to grow is by > > appending a single row at a time (which I guess then emits the > > "row-changed" signal and updates the scrollbar). > > You are mixing two things here: > - if the model grows is must emit the row-inserted signal, > because if it does not do this, the tree views showing it > break > - however, if no one is watching, namely when the model is > created, it can be instantaneously created with a million > of rows I see. Now I understand. I only need to implement my own "store" and make sure I only call gtk_tree_set_model() after I set the number of rows I want. > There are more troubles with huge tree views, namely the > tree view needs to know the sizes of the columns and rows -- > even those not currently visible as they still affect what > is visible. So you will probably end up using all the > confusing fixed size modes, and avoiding work in cell data > functions for invisible cells. I am aware of this kind of problems and am expecting them. > However, for a milion of rows scrolling through the tree > manually is no longer useful anyway, i.e. the user interface > ceases to be suitable for the task. You may want to use > a multilevel or search+paging base interface instead -- > essentially something that avoids the signle list with > a million of rows by design. I agree, but that's what the boss wants ;-) On the other hand, as I'm using a generic tree view to show a list, I could use that property to show a next and previous page controls (as "owner drawn" root columns) and restrict the ouput to some row limit. > Yeti Thank you, you were most helpful. Best regards, ~Nuno Lucas _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
