Using column breaks and sub-menus, makes navigation with the mouse almost
impossible.
e.g. with the code below
* open the menu
* hover the mouse over "one"
* hover the mouse over "Item #40"
* <Left-mouse-click> to select the submenu
* ... try to select in the new submenu "Item #40 : 2" with the mouse
I cannot, since when I hover the mouse over the other items their respective
submenu opens.
I can only selected it with the keyboard.
import tkinter as tk
#-------------------------------------------------------------------------------
def show_menu(event):
global root
menu = tk.Menu(root)
for label in ["one","two","three","four"]:
submenu = tk.Menu(menu)
menu.add_cascade(label=label, menu=submenu)
for i in range(101):
sub2menu = tk.Menu(submenu)
sublabel = f"Item #{i}"
submenu.add_cascade(label=sublabel,menu=sub2menu)
if i and i%20==0:
submenu.entryconfigure(i, columnbreak=1)
for j in range(10):
sub2menu.add_command(label=f"{sublabel} : {j}")
menu.tk_popup(event.x_root, event.y_root)
#-------------------------------------------------------------------------------
if __name__ == "__main__":
root = tk.Tk()
tk.Label(root, text="<1> Left click to show menu").pack()
tk.Label(root, text="<q> to exit").pack()
root.bind("<1>", lambda e: show_menu(e))
root.bind("<3>", lambda e: show_menu(e))
root.bind("<space>", lambda e: show_menu(e))
root.bind("<Key-q>", lambda e: root.destroy())
root.mainloop()
________________________________
From: Vasilis Vlachoudis <vasilis.vlachou...@cern.ch>
Sent: Monday 18 September 2023 09:42
To: Michael Lange <klappn...@web.de>
Cc: tkinter-discuss@python.org <tkinter-discuss@python.org>
Subject: Re: [Tkinter-discuss] Navigation in menu with multiple columns
Great, many thanks Michael!
________________________________
From: Michael Lange <klappn...@web.de>
Sent: Sunday 17 September 2023 02:14
To: Vasilis Vlachoudis <vasilis.vlachou...@cern.ch>
Cc: tkinter-discuss@python.org <tkinter-discuss@python.org>
Subject: Re: [Tkinter-discuss] Navigation in menu with multiple columns
Hi Vasilis,
On Fri, 15 Sep 2023 09:55:49 +0000
Vasilis Vlachoudis <vasilis.vlachou...@cern.ch> wrote:
> Hi Michael,
>
> here is a snipped of a code and what I've managed up to now
thanks, I get your point now :-)
I toyed around with your example a bit and came up with a custom menu
class (see below; for testing I added a few useless separators and another
submenu to the demo code). It's far from being perfect, but at least the
keyboard navigation appears to work (It might require more thorough
testing, though. Separators appear to be especially tricky.). Just for the
fun of it I also added keybindings for the PageUp, PageDown, Home and End
keys, which I thought might come in handy when dealing with huge submenus.
Have a nice day,
Michael
################################################################
import tkinter
class GriddedMenu(tkinter.Menu):
'''Menu with lots of menu items arranged in a grid.'''
# TODO: insert(), delete(), add_cascade(), add_checkbutton(),
# add_radiobutton(), add_separator(), configure()
def __init__(self, parent, numrows=20, **kw):
tkinter.Menu.__init__(self, parent, **kw)
self.numrows = numrows
self._curindex = -1
if self.type(0) == 'tearoff':
self._curindex = 0
self.bind("<Right>", self._on_key_right)
self.bind("<Left>", self._on_key_left)
self.bind("<Prior>", self._on_key_pageup)
self.bind("<Next>", self._on_key_pagedown)
self.bind("<Home>", self._on_key_home)
self.bind("<End>", self._on_key_end)
def add_cascade(self, **kw):
# FIXME: handle columnbreaks
tkinter.Menu.add_cascade(self, **kw)
self._curindex += 1
def add_command(self, **kw):
tkinter.Menu.add_command(self, **kw)
self._curindex += 1
if (self._curindex >= self.numrows) and \
(self._curindex % self.numrows == 0):
self.entryconfigure(self._curindex, columnbreak=1)
def add_separator(self, **kw):
# FIXME: handle columnbreaks
tkinter.Menu.add_separator(self, **kw)
self._curindex += 1
def _on_key_left(self, event):
index = self.index('active')
if index - self.numrows >= 0:
newindex = index - self.numrows
while (newindex >= 0) and (self.type(newindex) == 'separator'):
newindex -= self.numrows
if newindex >= 0:
self.activate(newindex)
return 'break'
def _on_key_right(self, event):
index = self.index('active')
end = self.index('end')
if index + self.numrows <= end:
newindex = index + self.numrows
while (newindex <= end) and (self.type(newindex) == 'separator'):
newindex += self.numrows
if newindex <= end:
self.activate(newindex)
return 'break'
def _on_key_pageup(self, event):
index = self.index('active')
row = index % self.numrows
newindex = index - row
while self.type(newindex) == 'separator':
newindex += 1
self.activate(newindex)
def _on_key_pagedown(self, event):
index = self.index('active')
row = index % self.numrows
newindex = min(self.index('end'), index + (self.numrows - row - 1))
while self.type(newindex) == 'separator':
newindex -= 1
self.activate(newindex)
def _on_key_home(self, event):
newindex = 0
while self.type(newindex) == 'separator':
newindex += 1
self.activate(newindex)
def _on_key_end(self, event):
newindex = self.index('end')
while self.type(newindex) == 'separator':
newindex -= 1
self.activate(newindex)
#------------------------------------------------------------------------------
if __name__ == "__main__":
def show_menu(event):
menu = tkinter.Menu(tearoff=0)
for label in ["one","two","three","four"]:
submenu = GriddedMenu(menu)
menu.add_cascade(label=label, menu=submenu)
for i in range(8):
submenu.add_command(label=f"Item #{i}")
submenu.add_separator()
for i in range(8, 57):
submenu.add_command(label=f"Item #{i}")
submenu.add_separator()
for i in range(57, 72):
submenu.add_command(label=f"Item #{i}")
submenu.add_separator()
for i in range(72, 101):
submenu.add_command(label=f"Item #{i}")
submenu.add_separator()
subsubmenu = tkinter.Menu(submenu)
submenu.add_cascade(label='foo', menu=subsubmenu)
subsubmenu.add_command(label='bar')
submenu.add_separator()
menu.tk_popup(event.x_root, event.y_root)
root = tkinter.Tk()
tkinter.Label(root, text="<1> Left click to show menu").pack()
tkinter.Label(root, text="<q> to exit").pack()
root.bind("<1>", show_menu)
root.bind("<Key-q>", lambda e: root.destroy())
root.mainloop()
###############################################################################
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