"""
I tried a simple case:
Frame with two Canvas widgets. I drag (i.e. move) Canvas #1. When it
overlaps with Canvas #2 neither the lift() nor the lower() methods work.
Why?
"""
from Tkinter import *
class myObject():
#--------------------------------
def __init__(self,root):
self.root = root
#place a Frame on the root:
self.f = Frame(self.root, bg="yellow", width=600, height=400)
self.f.pack()
#place a Canvas on the Frame:
self.c =Canvas(self.f, bg="cyan",width=100,height=50)
#NW-vtx of Canvas:
self.xNW=10
self.yNW=10
self.c.place(x=self.xNW,y=self.yNW)
##event-generators:
self.c.bind('<ButtonPress-1>', self.startMoveWindow)
self.c.bind('<B1-Motion>', self.MoveWindow)
self.c2=Canvas(self.f,bg="red",width=100,height=100)
self.c2.place(x=300,y=200)
self.c2.lower(self.c)
#-----------------------------------------------
def startMoveWindow(self, event):
## at start: record current root coordinates
self.xo, self.yo = event.x_root, event.y_root
#--------------------------------------
def MoveWindow(self, event):
self.root.update_idletasks()
## use root coordinates for offset of Widget (canvas) coordinates
self.xNW += event.x_root - self.xo
self.yNW+= event.y_root - self.yo
## update coordinates
self.xo, self.yo= event.x_root, event.y_root
## Move & redraw Widget (canvas)
self.c.place_configure(x=self.xNW, y=self.yNW)
#==================================
root=Tk()
x = myObject(root)
root.mainloop()
--
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