下面的代码应该在按下按钮时抛出指定的tkMessagebox（例如，如果在选择项目之前按下update_cost按钮，它将引发错误。但是，它目前只出现在我之后按下update_cost后按OK按钮。
谁能看到我做错了什么？干杯。 （下面的代码示例）。
def update_name(self, new_name):
key=self.get_key_from_selection()
if key == None:
tkMessageBox.showerror("Update Name","No item selected.")
else:
self.products.get_item(key).set_name(new_name)
self.refresh_listbox()
def update_cost(self, new_cost):
key=self.get_key_from_selection()
if key!=None:
item=self.products.get_item(key)
if item.get_type()==PART:
if new_cost.isdigit():
item.set_cost(int(new_cost))
self.refresh_listbox()
else:
tkMessageBox.showerror("Update Cost","Your input should be a number.")
else:
tkMessageBox.showerror("Update Cost","Action: 'Update_Cost' cannot be performed on a compound item.")
else:
tkMessageBox.showerror("Update Cost","No item selected.")
def update_items(self, new_items_list):
key=self.get_key_from_selection()
if key!=None:
item=self.products.get_item(key)
if item.get_type()==COMPOUND:
# In order to use the internal methods of compound class to check the format and dependence, a temporary compound will recieve new list first before add to the products list..
temp=Compound('temp','',self.products,[])
try:
temp.set_items(new_items_list)
except:
tkMessageBox.showerror("Update Items","Invalid Items List.")
return
do=True
# Check all the items in the new list to ensure them not conflict any conditions below, or the add operation will not be done.
for sub_item in temp.get_depend():
if sub_item not in self.products.get_keys():
tkMessageBox.showerror("Update Items","There is at least one item not in the products list.")
do=False
break
elif sub_item==item.get_ID():
tkMessageBox.showerror("Update Items","The item could not refer to the compound itself.")
do=False
break
if do:
item.set_items(new_items_list)
self.refresh_listbox()
else:
tkMessageBox.showerror("Update Items","Invalid Items List.")
else:
tkMessageBox.showerror("Update Items","No item selected.")
def push_remove_item(self):
key=self.get_key_from_selection()
if key!=None:
if not self.products.check_depend(key):
self.products.remove_item(key)
self.refresh_listbox()
else:
tkMessageBox.showerror("Remove Item","Selected item contained in compound item.")
else:
tkMessageBox.showerror("Remove Item","No item selected.")
# Controller part:
class Controller(object):
# This class organise all the controllers in the window.
def __init__(self, window):
# Initialise the View object.
self.view=View(window)
self.view.pack(side=TOP, ipady=130)
# Initialise the menu.
self.menu_bar=Menu(window)
window['menu']=self.menu_bar
self.file_menu=Menu(self.menu_bar)
self.menu_bar.add_cascade(label='File', menu=self.file_menu)
self.file_menu.add_command(label='Open Products File', command=self.view.push_open_file)
self.file_menu.add_command(label='Save Products File', command=self.view.push_save_file)
self.file_menu.add_command(label='Exit', command=exit)
# Initialise the function buttons, using a Frame to container layout them.
self.control_bar=Frame(window, width=150)
self.control_bar.pack(side=TOP, pady=10)
self.add_part_button=Button(self.control_bar, text="Add Part", command=self.push_add_part)
self.add_part_button.pack(side=LEFT, padx=20, anchor=CENTER)
self.add_compound_button=Button(self.control_bar, text="Add Compound", command=self.push_add_compound)
self.add_compound_button.pack(side=LEFT, padx=20, anchor=CENTER)
self.update_name_button=Button(self.control_bar, text="Update Name", command=self.push_update_name)
self.update_name_button.pack(side=LEFT, padx=20, anchor=CENTER)
self.update_cost_button=Button(self.control_bar, text="Update Cost", command=self.push_update_cost)
self.update_cost_button.pack(side=LEFT, padx=20, anchor=CENTER)
self.update_items_button=Button(self.control_bar, text="Update Items", command=self.push_update_items)
self.update_items_button.pack(side=LEFT, padx=20, anchor=CENTER)
self.remove_item_button=Button(self.control_bar, text="Remove Item", command=self.view.push_remove_item)
self.remove_item_button.pack(side=LEFT, padx=20, anchor=CENTER)
# Initialise the entry area in the botttom, using a Frame to container layout them.
self.entry_area=Frame(window, width=150)
self.entry_area.pack(side=BOTTOM, pady=10)
self.status=Label(self.entry_area, width=20)
self.status.pack(side=LEFT, padx=0, anchor=CENTER)
self.entry=Entry(self.entry_area, width=80)
self.entry.pack(side=LEFT, padx=0, anchor=CENTER)
self.OK_button=Button(self.entry_area, text="OK", command=self.push_OK)
self.OK_button.pack(side=LEFT, padx=20, anchor=CENTER)
# The next 5 methods will be activated after their corresponded buttons are pushed, the actions of them are to change the commandID variable and label text.
# The function of this variable is to set the function statue before typing in the entry box.
def push_add_part(self):
self.commandID=ADD_PART
self.status.config(text="Add Part ID")
def push_add_compound(self):
self.commandID=ADD_COMPOUND
self.status.config(text="Add Compound ID")
def push_update_name(self):
self.commandID=UPDATE_NAME
self.status.config(text="Update Name")
def push_update_cost(self):
self.commandID=UPDATE_COST
self.status.config(text="Update Cost")
def push_update_items(self):
self.commandID=UPDATE_ITEMS
self.status.config(text="Update Compound Items")
# The operations setted beofre will only be done after OK button pushed.
def push_OK(self):
if self.commandID==ADD_PART:
self.view.add_part(self.entry.get())
elif self.commandID==ADD_COMPOUND:
self.view.add_compound(self.entry.get())
elif self.commandID==UPDATE_NAME:
self.view.update_name(self.entry.get())
elif self.commandID==UPDATE_COST:
self.view.update_cost(self.entry.get())
elif self.commandID==UPDATE_ITEMS:
self.view.update_items(self.entry.get())
# Clear the label box.
self.status.config(text='')
# Clear the entry box.
self.entry.delete(0, END)
# Reset the command statue.
self.commandID=None
答案 0 :(得分：0)
您已经定义了这样的“update_cost”按钮：
self.update_cost_button=Button(..., command=self.push_update_cost)
...
def push_update_cost(self):
self.commandID=UPDATE_COST
self.status.config(text="Update Cost")
请注意，push_update_cost()中没有任何地方实际调用会产生错误的代码。该错误由视图上的update_cost方法生成，但该方法仅从push_OK调用，而push_OK仅作为对单击“确定”按钮的响应而被调用。