对于家庭作业,我必须创建一个应用程序,该应用程序每次用户单击按钮时都会创建一个文本字段,然后在按下“提交”按钮时从这些字段中获取值。 跟踪方法反复出现,但我不知道如何使用它。我知道它需要一个回调函数,但是该回调函数应该是什么?
from tkinter import *
from tkinter import ttk
import sqlite3
import getpass
import wipComingIn
class Application(object):
def __init__(self,master):
self.master=master
self.ScanWIPIn = Button(master, text="Scan WIP In", width=25,
font='Calibri 12
bold',background='snow',command=self.scanWIPIn).grid(row=0, column=0,
padx=10)
def scanWIPIn(self):
incomingInventory=wipComingIn.scanIn()
def main():
root = Tk()
app=Application(root)
root.title("Main Menu")
root.configure(background="light cyan")
root.resizable(0, 0)
root.geometry('230x230+300+80')
root.mainloop()
if __name__=='__main__':
main()
class scanIn(Toplevel):
def __init__(self):
Toplevel.__init__(self)
self.geometry('300x100+350+100')
self.title('Scan In')
self.resizable(0,0)
self.num_rows=1
self.LocationLb = Label(self,text='Scan Location:',font='Arial
12').grid(row=1,column=1)
self.LocationBCText = Entry(self).grid(row=1,column=2)
self.AddLotBtn= Button(self,text="Scan
Lot",command=self.addField).grid(row=2,column=1)
self.CompleteTransaction =
Button(self,text="Complete",command=self.AddEntry).grid(row=2,column=4)
global listOfLots
listOfLots=[]
listOfLocation=[]
global rowNum
rowNum=2
def addField(self):
height =Toplevel.winfo_height(self)
height=height+25
global rowNum
rowNum=rowNum+1
listOfLots.append(StringVar())
newLot = Entry(self, textvariable=listOfLots[rowNum - 2])
newLot.grid(row=rowNum,column=2, pady=1)
listOfLots.append(StringVar())
geometryText='300'+str(height)+'350+100'
print(geometryText)
self.geometry('300x'+str(height)+'+350+100')
newLot.focus_set()
答案 0 :(得分:1)
您可以尝试制作一个可以做到这一点的类,例如:
import tkinter as tk
from tkinter import ttk
root = tk.Tk()
root.geometry('200x200')
class EntryListWidget(ttk.Frame):
"""Widget that creates a column of entry boxes."""
def __init__(self, master):
super().__init__(master)
self.entries = []
def add_entry(self):
"""Creates a new entry box and keeps reference to respective variable."""
entry_var = tk.StringVar()
self.entries.append(entry_var)
ttk.Entry(self, textvariable=entry_var).pack()
def get_entries(self):
"""Gets each entrybox text and returns as list."""
return [entry.get() for entry in self.entries]
entry_widget = EntryListWidget(root)
entry_widget.pack()
# Buttons to control adding new entry and getting their values
ttk.Button(root, text='Add Entry', command=entry_widget.add_entry).pack()
ttk.Button(root, text='Get Entries', command=entry_widget.get_entries).pack()
root.mainloop()
只使用变量类而不跟踪;实际上,在这种情况下我不会使用trace,因为我相信每次变量更改时trace都会使用回调,并且这里有一个一次性的“提交”按钮来收集所有值。您可以扩展这个课堂想法,让我敢打赌。