Tkinter Treeview Widget sortieren

Question

Wie kann ich einen Treeview sortierbar machen wenn man auf den Header klickt?

import tkinter as tk
from tkinter import ttk

class GridViewApp:
    def __init__(self, root):
        self.root = root
        self.root.title("GridView Beispiel")

        self.gridview = ttk.Treeview(self.root, columns=("Column 1", "Column 2", "Column 3"), show="headings")
        self.gridview.heading("Column 1", text="Spalte 1")
        self.gridview.heading("Column 2", text="Spalte 2")
        self.gridview.heading("Column 3", text="Spalte 3")
        self.gridview.pack()

        self.populate_grid()

    def populate_grid(self):
        for i in range(1, 10):
            self.gridview.insert("", "end", values=(f"Zeile {i}", f"Wert {i*2}", f"{i+5}"))

def main():
    root = tk.Tk()
    app = GridViewApp(root)
    root.mainloop()

if __name__ == "__main__":
    main()

Answer 1

Um die Spalten sortierbar zu machen, musst du die Methode sort auf den Treeview anwenden, um die Sortierungsfunktionen für jede Spalte zu definieren.

import tkinter as tk
from tkinter import ttk

class GridViewApp:
    def __init__(self, root):
        self.root = root
        self.root.title("GridView Beispiel")

        self.gridview = ttk.Treeview(self.root, columns=("Column 1", "Column 2", "Column 3"), show="headings")
        self.gridview.heading("Column 1", text="Spalte 1", command=lambda: self.sort_column("Column 1"))
        self.gridview.heading("Column 2", text="Spalte 2", command=lambda: self.sort_column("Column 2"))
        self.gridview.heading("Column 3", text="Spalte 3", command=lambda: self.sort_column("Column 3"))
        self.gridview.pack()

        self.populate_grid()

    def populate_grid(self):
        for i in range(1, 10):
            self.gridview.insert("", "end", values=(f"Zeile {i}", f"Wert {i*2}", f"{i+5}"))

    def sort_column(self, column):
        data = [(self.gridview.set(child, column), child) for child in self.gridview.get_children("")]
        data.sort(reverse=False)  # Set reverse=True for descending order
        for index, item in enumerate(data):
            self.gridview.move(item[1], "", index)

def main():
    root = tk.Tk()
    app = GridViewApp(root)
    root.mainloop()

if __name__ == "__main__":
    main()