hi all,
maybe this is stupid question but i cannot catch mousewheel event in
Tk.Canvas.
I tryied <MouseWheel>, <Button-4>, <4> but without any luck. <1>, <2>,
<3> working.
I'm on Win7 Python3.2.
here is my example. Is something wrong in code or i need some magic to
catch this event.
thanks.
#encoding: utf-8
from tkinter import *
import tkinter.ttk as ttk
from PIL import Image, ImageTk
class PhotoView(Canvas):
def __init__(self, parent, **kw):
self.frame = Frame(parent, bd=2, relief='sunken')
self.frame.rowconfigure(0, weight=1)
self.frame.columnconfigure(0, weight=1)
super().__init__(self.frame)
Canvas.grid(self, column=0, row=0, sticky='news')
xscroll = ttk.Scrollbar(self.frame, orient=HORIZONTAL)
xscroll.grid(column=0, row=1, sticky='we')
yscroll = ttk.Scrollbar(self.frame, orient=VERTICAL)
yscroll.grid(column=1, row=0, sticky='sn')
self.config(width=640,
height=480,
xscrollcommand=xscroll.set,
yscrollcommand=yscroll.set)
xscroll.config(command=self.xview)
yscroll.config(command=self.yview)
# reset coordinate system
self.xview_moveto(0)
self.yview_moveto(0)
# binding
self.bind('<Configure>', self.make_scroll)
self.bind('<B3-Motion>', self.drag_image)
self.bind('<Button-4>', self.zoom_image) # dont work
self.bind('<MouseWheel>', self.zoom_image) # dont work
self.focus()
def drag_image(self, event=None):
pass
def make_scroll(self, event=None):
self.config(scrollregion=self.bbox(ALL))
def zoom_image(self, event=None):
print(event)
def grid(self, **kw):
self.frame.grid(**kw)
def pack(self, **kw):
self.frame.pack(**kw)
class mainGui(Tk):
def __init__(self):
super().__init__()
im = ImageTk.PhotoImage(Image.open('test_img.jpg'))
c = PhotoView(self)
c.pack(fill='both', expand='yes')
c.create_image(0, 0, image=im, anchor='nw')
c.image = im # keep reference !!
if __name__ == '__main__':
app = mainGui()
app.mainloop()
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