Unable to change background color of treeview in python

Question

I am trying to change the background color of the rows in treeview using tags but unable to get the success. Following is my code:

def display_device_status(self, colnames):
    # root = Tk()
    # self.root.title('Device Status')
    # self.root.resizable(width=FALSE, height=FALSE)
    # tree = ttk.Treeview(self.root, height=25, column=("col1", "col2"), show="headings", selectmode="browse")
    # tree.heading('#1', text='MAC')
    # tree.column('#1',width=290)
    # tree.heading('#2', text='Status')
    # tree.column('#2',width=290)
    tree = ttk.Treeview(self.root, height=25, column=colnames, show="headings", selectmode="browse")
    # tree.option_add()
    for eachcol in colnames:
        tree.heading(column=eachcol, text=eachcol)
        tree.column(column=eachcol, width=290, minwidth=0)
    vsb = ttk.Scrollbar(self.root, orient="vertical")
    vsb.configure(command=tree.yview)
    tree.configure(yscrollcommand=vsb.set)
    tree.pack(side="left")
    vsb.pack(side="right", fill="y")
    # viewing_records(tree)
    records = tree.get_children()
    for element in records:
        tree.delete(element)
    conn = sqlite3.connect('Gateway_Log.db')
    cursor = conn.cursor()
    query_result = cursor.execute("SELECT * FROM Status")
    for row in query_result:
        if row[1] == 1:
            tree.insert("", 'end', values=(row[0], 'Online'), tags = ('123',))
        else:
            tree.insert("", 'end', values=(row[0], 'Offline'), tags=('456',))
    tree.tag_configure('123', background='orange')
    tree.tag_configure('456', background='purple')
    cursor.close()
    conn.close()

when I run this code every time I am able to see background color as while only.

Please help me to change the background color of row.

If treeview is anything like the scrollbar or window borders you wont be able to change the color if you are on windows. — Mike - SMT
– Mike - SMT, Commented Sep 23, 2019 at 18:01

j_4321 · Accepted Answer · 2019-09-25 08:55:57Z

You are changing the color of the rows the right way, but there is currently a bug with treeviews in Tcl: https://core.tcl-lang.org/tk/tktview?name=509cafafae so the row color set from the tag is overridden by the treeview background color set by the style.

While waiting for the fixed version of tcl/tk, you can use the fix suggested in the bug ticket:

style = ttk.Style()

def fixed_map(option):
    # Returns the style map for 'option' with any styles starting with
    # ("!disabled", "!selected", ...) filtered out

    # style.map() returns an empty list for missing options, so this should
    # be future-safe
    return [elm for elm in style.map("Treeview", query_opt=option)
            if elm[:2] != ("!disabled", "!selected")]

style.map("Treeview",
          foreground=fixed_map("foreground"),
          background=fixed_map("background"))

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