[英]Visible textvariable in tkinter Entry widget
我在tkinter中使用Entry Box小部件時遇到麻煩。 當用戶選擇Edit-> Backbone ...時,我想打開一個新窗口。 在此窗口中,將有許多Entry窗口小部件(為簡單起見,下面僅對其進行編碼)顯示了存儲在各種實例中的默認Strings元素類。 用戶應該能夠編輯此字符串並通過單擊“確定”保存它,並通過單擊“默認”將其返回到其默認值。 每次重新打開主干編輯器時,輸入框應始終顯示變量的當前值(如果重新啟動整個程序,則無需記住用戶輸入)。
打開“主干編輯器”窗口后,“輸入”框應顯示字符串文本變量,但無法顯示它。
from tkinter import *
from tkinter import ttk
class View(ttk.Frame):
"""Main GUI class"""
def __init__(self, master = None):
self.WIDTH = 450
self.HEIGHT = 500
self.lib = MolecularLibrary()
# Set up the main window
ttk.Frame.__init__(self, master, borderwidth=5, width=self.WIDTH, height=self.WIDTH)
self.master.resizable(FALSE, FALSE)
self.grid(column=0, row=0, sticky=(N, S, E, W))
self.columnconfigure(0, weight=1)
self.create_menus()
def create_menus(self):
"""Produces the menu layout for the main window"""
self.master.option_add('*tearOff', FALSE)
self.menubar = Menu(self.master)
self.master['menu'] = self.menubar
# Menu Variables
menu_edit = Menu(self.menubar)
# Add the menus to the menubar and assign their variables
self.menubar.add_cascade(menu=menu_edit, label = "Edit")
### Edit ###
menu_edit.add_command(label="Backbone...", command=lambda : self.edit_backbone())
def edit_backbone(self):
"""Shows a window where the backbone constituents can be edited"""
backbone_window = Toplevel(borderwidth = 5)
backbone_window.title("Backbone Editor")
backbone_window.resizable(FALSE, FALSE)
print("sugar value", self.lib.sugar_var)
# LABELS FOR BACKBONE #
# Phosphate annotations and input
sugar_label = ttk.Label(backbone_window, text = "Sugar")
#inputs
sugar = ttk.Entry(backbone_window, textvariable = self.lib.sugar_var, justify = 'center', width=10)
### Buttons ###
default = ttk.Button(backbone_window, text = "Defaults", command=lambda : defaults())
okay = ttk.Button(backbone_window, text = "Okay", command=lambda : okay())
cancel = ttk.Button(backbone_window, text = "Cancel", command=lambda : backbone_window.destroy())
#content.grid(column=0, row=0)
sugar_label.grid(column=2, row=1)
sugar.grid(column=1, row=2, columnspan=3)
default.grid(column=0, row=12, columnspan=3, pady=2)
okay.grid(column=6, row=12, columnspan=3, pady=2)
cancel.grid(column=9, row=12, columnspan=4, pady=2)
backbone_window.focus()
def defaults():
"""Reset the backbone and bases to their defaults."""
self.lib.set_molecules()
def okay():
"""Set the backbone and base variables to the user set values."""
self.lib.sugar_var.new_formula(sugar.get())
backbone_window.destroy()
class MolecularLibrary:
"""
"""
def __init__(self, atom_file = r'C:\MyPyProgs\OSeq\resources\ATOMS.txt',
precision = 4):
self.molecules = {}
self.atom_file = atom_file
# self.molecule_file = molecule_file
# Variables
self.set_molecules()
def set_molecules(self):
"""
Set all of the molecules for the backbone and bases to their default values and forumlae.
"""
### Sugar ###
self.sugar_var = Element('C5H8O3', 'A')
def add_molecule(self, molecule):
"""(MolecularLibrary, list) -> None
Returns a dictionary of the molecule name as an Element
{molecule[0]: Element}
"""
print(molecule)
tmp = self.get_mass(molecule[1])
return {molecule[0]: Element(molecule[1], molecule[0], tmp[0], tmp[0])}
class Element:
"""
Creates an element with the following construct:
[symbol, name, monoisotopic, average]
"""
def __init__(self, symbol, name):
self.symbol = symbol
self.name = name
def __str__(self):
return str([self.symbol, self.name])
def get_name(self):
"""Returns the name of the Element"""
return self.name
def get_symbol(self):
"""Returns the symbol of the Element"""
return self.symbol
def new_formula(self, new_formula):
"""replace the formula with new_formaula and recalculate the
average and monoisotopic masses."""
self.symbol = new_formula
if __name__ == "__main__":
root = Tk()
root.title("Sequencer")
view = View(root)
root.mainloop()
上面的代碼是我程序的重剝離版本,但是具有相同的基本體系結構。 恐怕仍然有很多代碼,我通常會嘗試將其分解得更多,但是我不確定我遇到的問題是否來自體系結構。
為了使用textvariable
屬性,必須給它一個textvariable
變量的實例: StringVar
, IntVar
, BooleanVar
或DoubleVar
在這里了解更多有關這些變量的好起點: http : //effbot.org/tkinterbook/variable.htm
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