# Tk_drag_all.py

# Tk_drag_all.py

from tkinter import *

x = 0
y = 0

prevx = 0
prevy = 0

root = Tk()
root.title("Tk_drag_all.py")

canvas = Canvas(width=500, height=500, background="grey")
canvas.grid(row=0, column=0, sticky="nsew")


def btn_1(event):
    global x, y, prevx, prevy
    prevx = x = event.x
    prevy = y = event.y

def move_every_object_except_one(event):
    global x, y, prevx, prevy, target
    x = px = event.x
    y = py = event.y

    # use prevx and prevy to get the difference between the current and the previous position
    x, y =  x-prevx, y-prevy
    print (x,y)
    prevx = px
    prevy = py

    target = (target[0]+x, target[1]+y, target[2]+x, target[3]+y)
    draw()

# This is what enables scrolling with the mouse...
canvas.bind("<ButtonPress-1>", btn_1)
canvas.bind("<B1-Motion>", move_every_object_except_one)

colors = "red", "orange", "yellow", "green", "blue"
target = (0,0,1000,1000)
sz = 100

def draw():
    global target
    t = target
    canvas.delete('all')
    for n in colors:
        canvas.create_oval(t, outline=n, fill=n)
        t = t[0]+sz, t[1]+sz, t[2]-sz, t[3]-sz
    canvas.create_text(50,10, anchor="nw",
                            text="CLICK AND DRAG CANVAS TO MOVE OBJECTS")
    canvas.update()

draw()
root.mainloop()