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frontend.py
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from tkinter import *
from backend import Database
database = Database("books.db")
class Window(object):
def __init__(self,window):
self.window = window
self.window.wm_title("The Book Store")
l1 = Label(window, text="Title")
l1.grid(row=0, column=0)
l2 = Label(window, text="Author")
l2.grid(row=0, column=2)
l3 = Label(window, text="Year")
l3.grid(row=1, column=0)
l4 = Label(window, text="ISBN")
l4.grid(row=1, column=2)
self.title_text = StringVar()
self.e1 = Entry(window, textvariable=self.title_text)
self.e1.grid(row=0, column=1)
self.author_text = StringVar()
self.e2 = Entry(window, textvariable=self.author_text)
self.e2.grid(row=0, column=3)
self.year_text = StringVar()
self.e3 = Entry(window, textvariable=self.year_text)
self.e3.grid(row=1, column=1)
self.ISBN_text = StringVar()
self.e4= Entry(window, textvariable=self.ISBN_text)
self.e4.grid(row=1, column=3)
self.list1 = Listbox(window, height=6, width=35)
self.list1.grid(row=2, column=0, rowspan=6, columnspan=2)
self.list1.bind('<<ListboxSelect>>', self.get_selected_row)
# now we need to attach a scrollbar to the listbox, and the other direction,too
sb1 = Scrollbar(window)
sb1.grid(row=2, column=2, rowspan=6)
self.list1.config(yscrollcommand=sb1.set)
sb1.config(command=self.list1.yview)
b1 = Button(window, text="View all", width=12, command=self.view_command)
b1.grid(row=2, column=3)
b2 = Button(window, text="Search entry", width=12, command=self.search_command)
b2.grid(row=3, column=3)
b3 = Button(window, text="Add entry", width=12, command=self.add_command)
b3.grid(row=4, column=3)
b4 = Button(window, text="Update selected", width=12, command=self.update_command)
b4.grid(row=5, column=3)
b5 = Button(window, text="Delete selected", width=12, command=self.delete_command)
b5.grid(row=6, column=3)
b6 = Button(window, text="Close", width=12, command=window.destroy)
b6.grid(row=7, column=3)
def get_selected_row(self,event): #the "event" parameter is needed b/c we've binded this function to the listbox
try:
index = self.list1.curselection()[0]
self.selected_tuple = self.list1.get(index)
self.e1.delete(0,END)
self.e1.insert(END,self.selected_tuple[1])
self.e2.delete(0, END)
self.e2.insert(END,self.selected_tuple[2])
self.e3.delete(0, END)
self.e3.insert(END,self.selected_tuple[3])
self.e4.delete(0, END)
self.e4.insert(END,self.selected_tuple[4])
except IndexError:
pass #in the case where the listbox is empty, the code will not execute
def view_command(self):
self.list1.delete(0, END) # make sure we've cleared all entries in the listbox every time we press the View all button
for row in database.view():
self.list1.insert(END, row)
def search_command(self):
self.list1.delete(0, END)
for row in database.search(self.title_text.get(), self.author_text.get(), self.year_text.get(), self.ISBN_text.get()):
self.list1.insert(END, row)
def add_command(self):
database.insert(self.title_text.get(), self.author_text.get(), self.year_text.get(), self.ISBN_text.get())
self.list1.delete(0, END)
self.list1.insert(END, (self.title_text.get(), self.author_text.get(), self.year_text.get(), self.ISBN_text.get()))
def delete_command(self):
database.delete(self.selected_tuple[0])
self.view_command()
def update_command(self):
#be careful for the next line ---> we are updating using the texts in the entries, not the selected tuple
database.update(self.selected_tuple[0],self.title_text.get(), self.author_text.get(), self.year_text.get(), self.ISBN_text.get())
self.view_command()
#code for the GUI (front end)
window = Tk()
Window(window)
window.mainloop()