I have been using the code found here:
How to limit number of decimal places to be displayed in Gtk CellRendererText
successfully for several years to format Treeview number columns. But when I insert columns using a loop, the columns display the data from the first column, rather than the data I would expect to get from the ListStore. Why is this? I've struggled with this for sometime and it probably is a really simple solution, but I am rather clueless!! Thank you very much. Here's a working example that shows my problem:
from gi.repository import Gtk, Gdk
class myClass:
def __init__(self):
# Setup
self.iListstore = Gtk.ListStore(str, float, float, float, float)
self.iListstore.append(['abc',209.8967,568.56432, 1, 2])
self.iListstore.append(['def',2409.846,559.534, 3, 4])
self.window = Gtk.Window()
self.iTreeView = Gtk.TreeView(self.iListstore)
# Column 0
lblr= Gtk.CellRendererText()
lcol = Gtk.TreeViewColumn('Row Label')
self.iTreeView.append_column(lcol)
lcol.pack_start(lblr, True)
lcol.add_attribute(lblr, 'text',0)
# Column 1
cr = Gtk.CellRendererText(xalign=1)
myCol = Gtk.TreeViewColumn('Col1')
myCol.set_sort_column_id(1)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',1)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,1)[0],2))))
# Column 2
myCol = Gtk.TreeViewColumn('Col2')
myCol.set_sort_column_id(2)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',2)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,2)[0],2))))
# The above works but the following does not. Col3 has the same value as Col4. Can someone tell me the reason a loop can not be used with the code?
colNames=['Col3','Col4']
for i in range(3,5):
myCol = Gtk.TreeViewColumn(colNames[i-3]) # I realize this is a bit of a fudge
myCol.set_sort_column_id(i)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',i)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,i)[0],2))))
# Window
self.window.add(self.iTreeView)
self.window.show_all()
def main(self):
Gtk.main()
p=myClass()
p.main()
Just indeed the set_cell_data_func is a pivotal point for formatting text in a treeviewcolumn cell. I simplified the above answer, all is done in one go via a for loop. For the real formatting you can use the new f-string feature.
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, Gdk
class myClass:
def __init__(self):
# Setup
self.window = Gtk.Window()
iListstore = Gtk.ListStore(str, float, float, float, float)
iListstore.append(['abc',209.8967,568.56432, 1, 2])
iListstore.append(['def',2409.846,559.534, 3, 4])
self.iTreeView = Gtk.TreeView(model=iListstore)
self.window.add(self.iTreeView)
treeview_columns = ['Row Label', 'Col1', 'Col2', 'Col3', 'Col4']
for col_num, name in enumerate(treeview_columns):
# align text in column cells of row (0.0 left, 0.5 center, 1.0 right)
rendererText = Gtk.CellRendererText(xalign=1.0, editable=False)
column = Gtk.TreeViewColumn(name ,rendererText, text=col_num)
column.set_cell_data_func(rendererText, self.celldatafunction, func_data=col_num)
# center the column titles in first row
column.set_alignment(0.5)
# make all the column reorderable, resizable and sortable
column.set_sort_column_id(col_num)
column.set_reorderable(True)
column.set_resizable(True)
self.iTreeView.append_column(column)
# Window
self.window.connect("destroy", Gtk.main_quit)
self.window.show_all()
def celldatafunction(self, col, cell, mdl, itr, i):
# col = Columnn, cell = Cell, mdl = model, itr = iter, i = column number
# column is provided by the function, but not used
value = mdl.get(itr,i)[0]
if type(value) is not str:
cell.set_property('text',f'{value+0.005:.2f}')
path = mdl.get_path(itr)
row = path[0]
colors = ['white', 'lightskyblue']
# set alternating backgrounds
cell.set_property('cell-background', colors[row % 2])
def main(self):
Gtk.main()
p = myClass()
p.main()