class ScrolledWindow(Frame):
"""
1. Master widget gets scrollbars and a canvas. Scrollbars are connected
to canvas scrollregion.
2. self.scrollwindow is created and inserted into canvas
Usage Guideline:
Assign any widgets as children of <ScrolledWindow instance>.scrollwindow
to get them inserted into canvas
__init__(self, parent, canv_w = 400, canv_h = 400, *args, **kwargs)
docstring:
Parent = master of scrolled window
canv_w - width of canvas
canv_h - height of canvas
"""
def __init__(self, parent, *args, **kwargs):
"""Parent = master of scrolled window
canv_w - width of canvas
canv_h - height of canvas
"""
super().__init__(parent, *args, **kwargs)
self.parent = parent
self.canv_w = kwargs.get("width", 10)
self.canv_h = kwargs.get("height", 10)
# creating a scrollbars
self.yscrlbr = Scrollbar(self.parent)
self.yscrlbr.grid(column=1, row=0, sticky='ns')
# creating a canvas
self.canv = Canvas(self.parent)
self.canv.config(relief='flat',
width=self.canv_w,
heigh=self.canv_h,
bd=2)
# placing a canvas into frame
self.canv.grid(column=0, row=0, sticky='nsew')
# accociating scrollbar comands to canvas scroling
self.yscrlbr.config(command=self.canv.yview)
# creating a frame to inserto to canvas
self.scrollwindow = Frame(self.parent)
self.canv.create_window(0, 0, window=self.scrollwindow, anchor='nw')
self.canv.config(yscrollcommand=self.yscrlbr.set,
scrollregion=(0, 0, self.canv_w, self.canv_h))
self.yscrlbr.lift(self.scrollwindow)
self.scrollwindow.bind('<Configure>', self._configure_window)
self.scrollwindow.bind('<Enter>', self._bound_to_mousewheel)
self.scrollwindow.bind('<Leave>', self._unbound_to_mousewheel)
return
def _bound_to_mousewheel(self, event):
self.canv.bind_all("<MouseWheel>", self._on_mousewheel)
def _unbound_to_mousewheel(self, event):
self.canv.unbind_all("<MouseWheel>")
def _on_mousewheel(self, event):
self.canv.yview_scroll(int(-1 * (event.delta / 120)), "units")
def _configure_window(self, event):
# update the scrollbars to match the size of the inner frame
size = (self.scrollwindow.winfo_reqwidth(),
self.scrollwindow.winfo_reqheight())
try:
self.canv.config(scrollregion='0 0 %s %s' % size)
except:
return
if self.scrollwindow.winfo_reqwidth() != self.canv.winfo_width():
# update the canvas's width to fit the inner frame
self.canv.config(
width=min(self.scrollwindow.winfo_reqwidth(), self.canv_w))
s_h = self.scrollwindow.winfo_reqheight()
if s_h != self.canv.winfo_height():
# update the canvas's width to fit the inner frame
self.canv.config(height=min(s_h, self.canv_h))
