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Code: Alles auswählen

from Tkinter import*

def ChangeFontSize(event):

	global cvtext,fontsize

	canvas.delete(cvtext)

	cvtext = canvas.create_text(20,
								20,
								text="Size",
								font=("Courier", fontsize,"bold"),
								fill="blue",
								anchor="nw")
	fontsize += 2

root = Tk()

fontsize = 10
cvtext   = None


canvas = Canvas(root,width=300,height=200,bd=5,relief='raised',bg='yellow')
canvas.pack()
canvas.bind('<Button-1>', ChangeFontSize)

ChangeFontSize(None)

root.mainloop()

Code: Alles auswählen

from Tkinter import*

def ChangeFontSize(event):

	canvas.itemconfigure(cvtext,font=("Courier",fontsize,"bold"))
	fontsize += 2

root = Tk()

fontsize = 10
cvtext   = None

canvas = Canvas(root,width=300,height=200,bd=5,relief='raised',bg='yellow')
canvas.pack()
canvas.bind('<Button-1>', ChangeFontSize)

cvtext = canvas.create_text(20,
							20,
							text="Size",
							font=("Courier",fontsize,"bold"),
							fill="blue",
							anchor="nw")

root.mainloop()

Code: Alles auswählen

from Tkinter import*

def ChangeFontSize(event):

   global canvas,cvtext,fontsize

   fontsize += 2
   canvas.itemconfigure(cvtext, font=("Courier", fontsize,"bold"))

root = Tk()

fontsize = 10
cvtext   = None


canvas = Canvas(root,width=300,height=200,bd=5,relief='raised',bg='yellow')
canvas.pack()
canvas.bind('<Button-1>', ChangeFontSize)

cvtext = canvas.create_text(20,
                            20,
                            text="Size",
                            font=("Courier", fontsize,"bold"),
                            fill="blue",
                            anchor="nw")

root.mainloop() 

Code: Alles auswählen

Exception in Tkinter callback
Traceback (most recent call last):
  File "/var/tmp/python2.3-2.3.3-root/usr/lib/python2.3/lib-tk/Tkinter.py", line 1345, in __call__
    return self.func(*args)
  File "./xy.py", line 7, in ChangeFontSize
    canvas.itemconfigure(cvtext,font=("Courier",fontsize,"bold"))
UnboundLocalError: local variable 'fontsize' referenced before assignment

Code: Alles auswählen

#!/usr/bin/env python

from Tkinter import*

def ChangeFontSize(event):

   global cvtext, fontsize
   canvas.itemconfigure(cvtext,font=("Courier",fontsize,"bold"))
   fontsize += 2

root = Tk()

fontsize = 10
cvtext   = None

canvas = Canvas(root,width=300,height=200,bd=5,relief='raised',bg='yellow')
canvas.pack()
canvas.bind('<Button-1>', ChangeFontSize)

cvtext = canvas.create_text(20,
                     20,
                     text="Size",
                     font=("Courier",fontsize,"bold"),
                     fill="blue",
                     anchor="nw")

root.mainloop()