[Tkinter-discuss] Need help using Tkinter Widget lift() and lower() methods with Place geometry Manager

[GKalman]

"""
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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[Michael O'Donnell]

Dear GKalman,

According to the documentation, lift and lower affect the
toplevel that contains the canvas, they do not change
stacking order of widgets within a toplevel.

Maybe the better alternative is to call
a place_forget() on the lower canvas and
then place it again, which should put it
above.

I have never used place() and am not
sure of its abilities to do what you want.

Another possibility is to use a Canvas
instead of your enclosing frame, and
then use creatr_window to place
your canvases within the enclosing canvas,
and use canvas methods: move, tag_raise
and tag_lower raise and lower your
canvases relative to each other.

Just a suggestion,

Mick

Post by GKalman
"""
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 *
#--------------------------------
self.root = root
self.f = Frame(self.root, bg="yellow", width=600, height=400)
self.f.pack()
self.c =Canvas(self.f, bg="cyan",width=100,height=50)
self.xNW=10
self.yNW=10
self.c.place(x=self.xNW,y=self.yNW)
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)
#-----------------------------------------------
## at start: record current root coordinates
self.xo, self.yo = event.x_root, event.y_root
#--------------------------------------
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()
--
View this message in context: http://python.6.x6.nabble.com/Need-help-using-Tkinter-Widget-lift-and-lower-methods-with-Place-geometry-Manager-tp5050511.html
Sent from the Python - tkinter-discuss mailing list archive at Nabble.com.
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