def check_tkvar(val: tk.Variable, allow_blank: bool = False):
"""Returns True if calling ``val.get()`` doesn't raise `TclError`."""
try:
val.get()
return True
except tk.TclError:
# noinspection PyProtectedMember
if allow_blank and not val._tk.globalgetvar(val._name).strip():
return True
else:
return False
class Prop:
def __init__(self, initialValue=None, callback=None):
self._var = Variable(value=initialValue)
if callback is not None:
self._var.trace(mode='w', callback=callback)
def get(self):
return self._var.get()
def set(self, value):
self._var.set(value)
def on_change(self, listener):
def update(*dummy):
listener(self._var.get())
self._var.trace('w', update)
def wrap_cls(_unit: Variable, amount: Variable) -> str:
unit = _unit.get()
if unit in size_units:
return size_units[unit].__name__ + f'({amount.get()})'
elif unit in time_units:
return time_units[unit].__name__ + f'({amount.get()})'
else:
raise NotImplementedError
def test_variable(self):
self.assertRaises(RuntimeError, Variable)
root = tkinter.Tk()
v = Variable()
v.set("value")
self.assertEqual(v.get(), "value")
root.destroy()
tkinter.NoDefaultRoot()
self.assertRaises(RuntimeError, Variable)
def _update_fromvar(self, key: str, var: tk.Variable, *unused):
# OptionMenu gives us the changes as positional argument,
# but Checkbutton doesn't
# This function streamline the process of getting the value,
# and thus *args is here to catch some additional unused parameters
conf = {}
conf[key] = var.get()
self._update_config(**conf)
def __init__(self,
master: tk_gui.VariableListFrame,
values: Union[data.ValueRange, Tuple],
variable: tk.Variable,
text: str,
width=650,
execute: Optional[callable] = None):
super().__init__(master)
# basic behaviour and layout
self.transient(master)
self.protocol('WM_DELETE_WINDOW', self._on_close)
self.grab_set()
self.config(background='white')
# Label and Title
self.title = 'Set Value'
ttk.Label(self, text=text).pack()
# Variable change widget
if isinstance(values, data.ValueRange):
tk.Scale(master=self,
from_=values.min,
to=values.max,
resolution=values.step or (values.max - values.min) / 100,
orient=tk.HORIZONTAL,
variable=variable,
length=width,
background='white').pack()
else:
ttk.Combobox(master=self,
textvariable=variable,
values=values,
background='white').pack()
self.variable = variable
self.original_value = variable.get()
# Button(s)
button_frame = ttk.Frame(self)
button_frame.pack()
if execute:
@tk_gui.message_box_on_error
def command_ok():
self.destroy()
self.grab_release()
execute(variable.get())
else:
command_ok = self.destroy
ttk.Button(button_frame, text='Done', command=command_ok) \
.grid(row=0, column=1, padx=30, pady=10)
ttk.Button(button_frame, text='Cancel', command=self._on_close) \
.grid(row=0, column=0)
class OptionMenuComponent(MediatorComponent):
"""WidgetMediator component that contains an OptionMenu
"""
# Private Attributes:
# - _var: the external mutatable variable for the menu widget
# - _om: the OptionMenu shown to the user that displays the selection
# - _mediator: the mediator to notify a selection has been made to update other colleages
_var: Variable
_om: OptionMenu
_mediator: MenuMediator
def __init__(self, parent: Widget, mediator: MenuMediator) -> None:
self._var = Variable()
self._mediator = mediator
self._om = OptionMenu(parent, self._var, "")
def reset_selection(self) -> None:
"""Sets the option menu variable to an empty string"""
self._var.set("")
def set_selection(self, data: list) -> None:
"""Sets the OptionMenu options to data"""
menu = self._om["menu"]
_delete_menu_options(menu)
def click_command(variable: Variable, opt: Any) -> Callable:
"""Return the command to be called when clicking an option item"""
def wrapper() -> None:
"""Function called when clicking an option item"""
variable.set(opt)
self._mediator.update_selection(())
return wrapper
data = sorted(set(data))
menu.add_command(label="", command=click_command(self._var, ""))
for option in data:
menu.add_command(label=option,
command=click_command(self._var, option))
def get_widget(self) -> Widget:
"""Return a list containing this OptionMenu"""
return self._om
def configure_menu(self, config: str, value: str) -> None:
"""Configures the setting of the composed dOptionMenu"""
self._om[config] = value
def get_selected(self) -> Any:
"""Return the current variable's value"""
return self._var.get()
def tkVariable(var: Variable, key: str, default=None):
"""
将tkinter的var绑定到缓存
:param var:
:param key:
:param default:
:return:
"""
_cache = cache.get(key, default=None)
if _cache is None:
if default is not None:
var.set(default)
else:
var.set(_cache)
var.trace('w', lambda a, b, c: cache.set(key, var.get()))
def test_trace_old(self):
# Old interface
v = Variable(self.root)
vname = str(v)
trace = []
def read_tracer(*args):
trace.append(('read', ) + args)
def write_tracer(*args):
trace.append(('write', ) + args)
cb1 = v.trace_variable('r', read_tracer)
cb2 = v.trace_variable('wu', write_tracer)
self.assertEqual(sorted(v.trace_vinfo()), [('r', cb1), ('wu', cb2)])
self.assertEqual(trace, [])
v.set('spam')
self.assertEqual(trace, [('write', vname, '', 'w')])
trace = []
v.get()
self.assertEqual(trace, [('read', vname, '', 'r')])
trace = []
info = sorted(v.trace_vinfo())
v.trace_vdelete('w', cb1) # Wrong mode
self.assertEqual(sorted(v.trace_vinfo()), info)
with self.assertRaises(TclError):
v.trace_vdelete('r', 'spam') # Wrong command name
self.assertEqual(sorted(v.trace_vinfo()), info)
v.trace_vdelete('r', (cb1, 43)) # Wrong arguments
self.assertEqual(sorted(v.trace_vinfo()), info)
v.get()
self.assertEqual(trace, [('read', vname, '', 'r')])
trace = []
v.trace_vdelete('r', cb1)
self.assertEqual(v.trace_vinfo(), [('wu', cb2)])
v.get()
self.assertEqual(trace, [])
trace = []
del write_tracer
gc.collect()
v.set('eggs')
self.assertEqual(trace, [('write', vname, '', 'w')])
trace = []
del v
gc.collect()
self.assertEqual(trace, [('write', vname, '', 'u')])
def test_trace(self):
v = Variable(self.root)
vname = str(v)
trace = []
def read_tracer(*args):
trace.append(('read', ) + args)
def write_tracer(*args):
trace.append(('write', ) + args)
tr1 = v.trace_add('read', read_tracer)
tr2 = v.trace_add(['write', 'unset'], write_tracer)
self.assertEqual(sorted(v.trace_info()), [(('read', ), tr1),
(('write', 'unset'), tr2)])
self.assertEqual(trace, [])
v.set('spam')
self.assertEqual(trace, [('write', vname, '', 'write')])
trace = []
v.get()
self.assertEqual(trace, [('read', vname, '', 'read')])
trace = []
info = sorted(v.trace_info())
v.trace_remove('write', tr1) # Wrong mode
self.assertEqual(sorted(v.trace_info()), info)
with self.assertRaises(TclError):
v.trace_remove('read', 'spam') # Wrong command name
self.assertEqual(sorted(v.trace_info()), info)
v.get()
self.assertEqual(trace, [('read', vname, '', 'read')])
trace = []
v.trace_remove('read', tr1)
self.assertEqual(v.trace_info(), [(('write', 'unset'), tr2)])
v.get()
self.assertEqual(trace, [])
trace = []
del write_tracer
gc.collect()
v.set('eggs')
self.assertEqual(trace, [('write', vname, '', 'write')])
trace = []
del v
gc.collect()
self.assertEqual(trace, [('write', vname, '', 'unset')])
def test_trace_old(self):
# Old interface
v = Variable(self.root)
vname = str(v)
trace = []
def read_tracer(*args):
trace.append(('read',) + args)
def write_tracer(*args):
trace.append(('write',) + args)
cb1 = v.trace_variable('r', read_tracer)
cb2 = v.trace_variable('wu', write_tracer)
self.assertEqual(sorted(v.trace_vinfo()), [('r', cb1), ('wu', cb2)])
self.assertEqual(trace, [])
v.set('spam')
self.assertEqual(trace, [('write', vname, '', 'w')])
trace = []
v.get()
self.assertEqual(trace, [('read', vname, '', 'r')])
trace = []
info = sorted(v.trace_vinfo())
v.trace_vdelete('w', cb1) # Wrong mode
self.assertEqual(sorted(v.trace_vinfo()), info)
with self.assertRaises(TclError):
v.trace_vdelete('r', 'spam') # Wrong command name
self.assertEqual(sorted(v.trace_vinfo()), info)
v.trace_vdelete('r', (cb1, 43)) # Wrong arguments
self.assertEqual(sorted(v.trace_vinfo()), info)
v.get()
self.assertEqual(trace, [('read', vname, '', 'r')])
trace = []
v.trace_vdelete('r', cb1)
self.assertEqual(v.trace_vinfo(), [('wu', cb2)])
v.get()
self.assertEqual(trace, [])
trace = []
del write_tracer
gc.collect()
v.set('eggs')
self.assertEqual(trace, [('write', vname, '', 'w')])
trace = []
del v
gc.collect()
self.assertEqual(trace, [('write', vname, '', 'u')])
def test_trace(self):
v = Variable(self.root)
vname = str(v)
trace = []
def read_tracer(*args):
trace.append(('read',) + args)
def write_tracer(*args):
trace.append(('write',) + args)
tr1 = v.trace_add('read', read_tracer)
tr2 = v.trace_add(['write', 'unset'], write_tracer)
self.assertEqual(sorted(v.trace_info()), [
(('read',), tr1),
(('write', 'unset'), tr2)])
self.assertEqual(trace, [])
v.set('spam')
self.assertEqual(trace, [('write', vname, '', 'write')])
trace = []
v.get()
self.assertEqual(trace, [('read', vname, '', 'read')])
trace = []
info = sorted(v.trace_info())
v.trace_remove('write', tr1) # Wrong mode
self.assertEqual(sorted(v.trace_info()), info)
with self.assertRaises(TclError):
v.trace_remove('read', 'spam') # Wrong command name
self.assertEqual(sorted(v.trace_info()), info)
v.get()
self.assertEqual(trace, [('read', vname, '', 'read')])
trace = []
v.trace_remove('read', tr1)
self.assertEqual(v.trace_info(), [(('write', 'unset'), tr2)])
v.get()
self.assertEqual(trace, [])
trace = []
del write_tracer
gc.collect()
v.set('eggs')
self.assertEqual(trace, [('write', vname, '', 'write')])
trace = []
del v
gc.collect()
self.assertEqual(trace, [('write', vname, '', 'unset')])
def test_name_and_value(self):
v = Variable(self.root, "sample string", "varname")
self.assertEqual("sample string", v.get())
self.assertEqual("varname", str(v))
def test_default(self):
v = Variable(self.root)
self.assertEqual("", v.get())
self.assertRegex(str(v), r"^PY_VAR(\d+)$")
def test_name_and_value(self):
v = Variable(self.root, "sample string", "varname")
self.assertEqual("sample string", v.get())
self.assertEqual("varname", str(v))
def test_default(self):
v = Variable(self.root)
self.assertEqual("", v.get())
self.assertRegex(str(v), r"^PY_VAR(\d+)$")
def SaveVar(var: _TK.Variable, master=None, value=None, name=None, filename='data.pkl') \
-> (_TK.Variable):
"""Save tkinter variable data in a pickle file and load the
same value when the program is executed next time.
#### If the content of the file changes, it might not load correct values \
to the assigned variables. To avoid this issue use `name` to \
refer to the exact assigned values later.
### Args:
- `var`: Give the `tkinter.Variable` class like (`tk.StringVar`, `tk.IntVar`).
- `master`: Parent widget.
- `value`: Set value.
- `name`: Set a name to group variables or to refer to assigned value when loaded.
- `filename`: Set the name of the save file. (To make the file invisible in the \
directory start the name of the file with "." like ".cache-savevar")
### Return:
- returns the tk.Variable instance passed to `var` argument.
### Example:
root = tk.Tk()
var1 = SaveVar(tk.StringVar,'Enter Username','Var1','.cache-savevar')
var2 = SaveVar(tk.StringVar,'Enter Password','Var2','.cache-savevar')
tk.Entry(root,textvariable=var1).pack()
tk.Entry(root,textvariable=var2).pack()
root.mainloop()"""
def update_val(*args):
"""Internal function for updating the value for variable"""
try: # try/except , if the file doesn't exists.
open1 = open(filename, 'rb')
tmpdict = pkl.load(open1) # load saved dictionary data.
# Block of code to check for the right value.
if tmpdict.get(str(var)):
old, default = tmpdict.get(str(var))
new = var.get()
if new != default:
var.set(new)
elif new == default and not startup[0]:
var.set(default)
else:
var.set(old)
tmpdict.update({str(var): (var.get(), defaultval)})
open1.close()
except Exception as e:
tmpdict = {}
tmpdict[str(var)] = (var.get(), defaultval)
open2 = open(filename, 'wb')
pkl.dump(tmpdict, open2)
startup[0] = False
open2.close()
startup = [True]
if not(filename.endswith('.pickle') or filename.endswith('.pkl')) \
and not filename.startswith('.'):
filename = filename + '.pkl'
var = var(master=master, value=value, name=name)
defaultval = var.get() # get a default value of the variable
update_val()
for mode, cbname in (var.trace_info()):
if mode[0] == 'write' and update_val.__name__ in cbname:
try:
var.trace_remove('write', cbname)
except:
pass
res = var.trace_add('write', update_val)
return var
def _forward_options(self, key: str, var: tk.Variable, *unused):
option = {}
option[key] = var.get()
self.set_options(**option)
def test_name_and_value(self):
v = Variable(self.root, 'sample string', 'varname')
self.assertEqual('sample string', v.get())
self.assertEqual('varname', str(v))
def test_default(self):
v = Variable(self.root)
self.assertEqual('', v.get())
self.assertRegex(str(v), '^PY_VAR(\\d+)$')