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List: gtk-app-devel
Subject: Re: PyGObject Maybe bug with alternate row colors in a Gt.TreeView
From: Eric Cashon via gtk-app-devel-list <gtk-app-devel-list () gnome ! org>
Date: 2018-05-16 17:51:36
Message-ID: 1636a1429fc-1db7-2f6bc () webjas-vaa167 ! srv ! aolmail ! net
[Download RAW message or body]
I took a look at the stackoverflow discussion about this and there is some sample code there to \
change colors of individual records in the treeview list. You can no longer do even and odd \
colors in CSS but being able to connect a cell renderer property to a column value can be very \
useful.
The following gives an error if I use "cell-background" which is stated in the documentation. \
Maybe just a typo someplace but "cell_background" seems to work fine for binding the color \
column to the cell-background property. You can pass some common color names or a rgb hex value \
for a color string.
Maybe a pretty terrible color combo going here but it might be a useful technique to highlight \
particular records to bring a users attention to them. A lot that you can do with a treeview.
Eric
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
class MainWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="Stripes")
self.set_default_size(200, 200)
self.set_position(Gtk.WindowPosition.CENTER)
self.liststore = Gtk.ListStore(str, str)
self.liststore.append(["Apples", "cyan"])
self.liststore.append(["Oranges", "yellow"])
self.liststore.append(["Pears", "cyan"])
self.liststore.append(["Currants", "yellow"])
self.liststore.append(["Gooseberries", "#00ffff"])
self.liststore.append(["Strawberries", "#ffff00"])
self.treeview = Gtk.TreeView(model=self.liststore)
self.treeview.set_vexpand(True)
self.treeview.set_hexpand(True)
self.renderer = Gtk.CellRendererText()
self.renderer.set_property("font", "Arial 16")
self.renderer.set_property("xalign", 0.5)
#Set the column to get the background color from. Need cell_background instead of \
cell-background???
self.column = Gtk.TreeViewColumn("Fruit", self.renderer, text = 0, cell_background = 1)
self.column.set_expand(True)
self.treeview.append_column(self.column)
self.add(self.treeview)
win = MainWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()
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