Question

I’m using PyGTK TreeView (as list) for my data. Is there any way to load more data on demand by going throu the list.

For example:

I have database table where is 200 000 records. At application start- loads 200 records from table. when i scroll download more data to treeView.

Answer 1

I believe you could do following:

1. Add empty lines to your model, I believe you should be using GtkListStore

2. For the treeview cell renderer define a data function.

3. In the data function check if current model row is loaded and load it from SQL if it’s not. I guess you can use cashing here and load more then one row at once.

Below is an example of how to set up the data function:

cell = gtk.CellRendererText()        
column = gtk.TreeViewColumn('column0', cell, text=0)   
column.set_cell_data_func(cell, self.load_data)
self.list.append_column(column)

….

def load_data(self, column, cell, model, iter):
    # load data for the given model row
    print 'load data ' + model.get_value(iter, 0)

hope this helps, regards