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Code: Alles auswählen

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import tkinter as tk

APP_TITLE = "Button placing on canvas"
APP_XPOS = 100
APP_YPOS = 100
APP_WIDTH = 600
APP_HEIGHT = 200

ANCHORS = ['center', 'n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw']
FONT = ('Helevetica', 14, 'bold')

        
class Application(tk.Tk):

    def __init__(self):
        tk.Tk.__init__(self)
        self.title(APP_TITLE)
        
    def build(self):
        self.protocol("WM_DELETE_WINDOW", self.close_app)
        self.geometry("+{}+{}".format(APP_XPOS, APP_YPOS))
        self.geometry("{}x{}".format(APP_WIDTH, APP_HEIGHT))
        self.option_add("*Button.highlightThickness", 0)
        
        self.canvas = tk.Canvas(self, bg='#FFFF00')
        self.canvas.pack(fill='both', expand=True)
        self.canvas.update_idletasks()
        
        self.pos_var = tk.StringVar()
        self.button = tk.Button(None, textvariable=self.pos_var, width=18,
            height=2, font=FONT)
        self.button.pack(padx=10, pady=10)
        
        self.button_width = self.button.winfo_reqwidth()
        self.button_height = self.button.winfo_reqheight()
        
        self.button_xpos = 0
        self.button_ypos = 0
        self.button_window = self.canvas.create_window(
            self.button_xpos,
            self.button_ypos,
            window=self.button, anchor='nw', tag='button')
        
        self.place_the_button()
        
    def place_the_button(self, pos_index=0):
        canvas_width = self.canvas.winfo_width()
        canvas_height = self.canvas.winfo_height()
        print(self.button_width, self.button_height, canvas_width, canvas_height)
        anchor = ANCHORS[pos_index]
        if anchor == 'center':
            xpos = (canvas_width-self.button_width) / 2
            ypos = (canvas_height-self.button_height) / 2
        elif anchor == 'n':
            xpos = (canvas_width-self.button_width) /2
            ypos = 0
        elif anchor == 'ne':
            xpos = (canvas_width-self.button_width)
            ypos = 0
        elif anchor == 'e':
            xpos = (canvas_width-self.button_width)
            ypos = (canvas_height-self.button_height) / 2
        elif anchor == 'se':
            xpos = (canvas_width-self.button_width)
            ypos = (canvas_height-self.button_height)
        elif anchor == 's':
            xpos = (canvas_width-self.button_width) / 2
            ypos = (canvas_height-self.button_height)
        elif anchor == 'sw':
            xpos = 0
            ypos = (canvas_height-self.button_height)
        elif anchor == 'w':
            xpos = 0
            ypos = (canvas_height-self.button_height) / 2
        elif anchor == 'nw':
            xpos = 0
            ypos = 0
            
        self.pos_var.set("Position:\n'{}'".format(anchor))    
        self.canvas.coords('button', xpos, ypos)
        pos_index += 1
        if pos_index == len(ANCHORS):
            pos_index = 0
            
        self.after(2000,self.place_the_button, pos_index)
        
    def close_app(self):
        # Here do something before apps shutdown
        print("Good Bye!")
        self.destroy()


def main():        
    app = Application()
    app.build()
    app.mainloop()

if __name__ == '__main__':
    main()

Code: Alles auswählen

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import tkinter as tk
 
       
class Application(tk.Tk):

    def __init__(self, title):
        tk.Tk.__init__(self)
        self.title(title)
        
        self.geometry("300x300")
        
        self.canvas = tk.Canvas(self, bg='#FFFF00')
        self.canvas.pack(fill='both', expand=True)
        self.canvas.update_idletasks()
        
        self.pos_var = tk.StringVar()
        self.button = tk.Button(None, text="Button-Widget", width=10)
        self.button.pack()
        
        # Alte Button Position        
        xpos = 0
        ypos = 0
        self.button_window = self.canvas.create_window(xpos, ypos,
            window=self.button, anchor='nw', tag='button')

        # Neue Button Position
        xpos = 150
        ypos = 150
        self.canvas.coords('button', xpos, ypos)


Application("Button placing on canvas").mainloop()