在下面的代码中,我遇到了self.dmenu1.bind("<Button-1>", self.branches)
行的问题,如果有人能帮我找到正确的方向,我将不胜感激。在
我希望在下拉菜单中选择一个选项,它会改变下面列表框中的排序。
然而,实际发生的是,在我做出选择之后,我必须再次单击下拉框,排序才会生效。在
这不是用户希望下拉菜单工作的方式。我已经发布了完整的代码,正如你所看到的,我是新手,但这是一个很好的学习挑战:)
提前感谢您的帮助。
谨致问候
from tkinter import *
ALL = N+S+W+E
users = ['Fred Asus','Tom Yahoo','Jessy Samsung','Jermain Sony','Nikki Nikon',
'Ian IBM','Elena Google','Rob Braun','Tammy Tonika','James Intel',
'Murphy Richards','Daniel Denon']
branchlst = {138:'Driving - St Albans', 170:'Brighton', 271:'Driving - Birmingham',
330:'Leeds', 680:'Edinburgh'}
class Application(Frame):
def __init__(self, master=None):
#initiate the primary window.
Frame.__init__(self, master)
self.master.rowconfigure(0, weight=1)
self.master.columnconfigure(0, weight=1)
self.rowconfigure(0, weight=0)
self.rowconfigure(1, weight=0)
self.rowconfigure(2, weight=3)
self.columnconfigure(0, weight=0)
self.columnconfigure(1, weight=1)
self.columnconfigure(2, weight=1)
self.grid(sticky=ALL)
self.frameset()
def frameset(self):
#define and setup frames with columns and rows for widgets
#Colours added to framesets to help designing layout. delete them
self.Frame1 = Frame(self) # D
self.Frame2 = Frame(self, bg='blue') # E
self.Frame3 = Frame(self) # L
self.Frame4 = Frame(self, bg='blue') # E
self.Frame5 = Frame(self) # T
self.Frame6 = Frame(self) # E colours
self.Frame1.rowconfigure(0,weight=0)
self.Frame2.rowconfigure(0,weight=0)
self.Frame3.rowconfigure(0,weight=1)
self.Frame4.rowconfigure(0,weight=1)
self.Frame5.rowconfigure(0,weight=1)
self.Frame6.rowconfigure(0,weight=1)
self.Frame1.columnconfigure(0,weight=0)
self.Frame2.columnconfigure(0,weight=0)
self.Frame3.columnconfigure(0,weight=1)
self.Frame4.columnconfigure(0,weight=1)
self.Frame5.columnconfigure(0,weight=1)
self.Frame6.columnconfigure(0,weight=1)
self.Frame1.grid(row=0, column=0, rowspan=1, columnspan=1, sticky=ALL)
self.Frame2.grid(row=0, column=1, columnspan=2, sticky=ALL)
self.Frame3.grid(row=1, column=0, rowspan=2, sticky=ALL)
self.Frame4.grid(row=1, column=1, columnspan=2, sticky=ALL)
self.Frame5.grid(row=2, column=1, rowspan=1, columnspan=1, sticky=ALL)
self.Frame6.grid(row=2, column=2, sticky=ALL)
label4a = Label(self.Frame4, text='table1', bg='orange')
label4b = Label(self.Frame4, text='table2', bg='yellow')
label4a.pack(side=LEFT)
label4b.pack(side=RIGHT)
self.objects()
def objects(self):
var = StringVar()
var.set('Name')
self.dmenu1 = OptionMenu(self.Frame1, var,'Costcode','Name')
self.dmenu1.pack(side=TOP, fill=BOTH)
self.dmenu1.bind("<Button-1>", self.branches)
self.f3ListBox = Listbox(self.Frame3, selectmode='single')
#self.branches()
self.f3ListBox.grid(sticky=ALL)
self.f3ListBox.bind("<Button-3>", self.f1handler1)
f5ListBox = Listbox(self.Frame5, selectmode='single')
n = 0
for item in users:
f5ListBox.insert(n,item)
n += 1
f5ListBox.grid(sticky=ALL)
f6ListBox = Listbox(self.Frame6, selectmode='single')
f6ListBox.insert(1,'S123456') # DELETE
f6ListBox.insert(2,'S313414') # DELETE
f6ListBox.insert(3,'S573343') # DELETE
f6ListBox.grid(sticky=ALL)
def f1handler1(self, event):
"""Creates a popup menu for the alternative mouse button.
Edit this to add more options to that popup"""
select = lambda: self.f3ListBox.delete(ACTIVE)
popup = Menu(self, tearoff=0)
popup.add_command(label='Quit',command=self.quit)
popup.add_command(label='delete',command=select) #add more of these for more options
try:
popup.post(event.x_root, event.y_root)
except:
pass
def branches(self, event):
self.f3ListBox.delete(0,END)
n = 0
if self.dmenu1.cget('text') == 'Costcode':
cc = sorted(list(branchlst.keys()))
for item in cc:
self.f3ListBox.insert(n,str(item)+' '+branchlst[item])
n += 1
elif self.dmenu1.cget('text') == 'Name':
bb = sorted(list(branchlst.values()))
for item in bb:
for name,val in branchlst.items():
if item == val:
self.f3ListBox.insert(n,item+' '+str(name))
root = Tk()
app = Application(master=root)
app.mainloop()
StringVar类有一个
trace
方法,它允许您向它附加一个回调函数。当变量的值发生变化时,将调用该函数。在在代码中,在
objects
方法中的var.set('Name')
行的正下方添加这一行。在这将导致在}。它将使用三个参数调用,因此需要将分支的定义更改为:
^{pr2}$var
发生变化时调用{您还应该删除
self.dmenu1.bind("<Button-1>", self.branches)
行,因为它现在是多余的。在我更喜欢理解问题和解决问题的方法,所以让我们一起来看看。在代码中有
self.dmenu1.bind("<Button-1>", self.branches)
。在你问过你自己这个事件什么时候开始的?当您单击
OptionMenu
时,它将被激发。这意味着将使用当前选项。所以,假设选项“a”处于活动状态,而您更改为选项“b”。此选择更改不会触发Button-1事件,但当您再次单击OptionMenu
时,它将触发,然后小部件将以“b”作为当前选项。在代码中的实际内容是:
前面提到的绑定可以安全地消除。刚刚添加的
command
选项将在您的OptionMenu
上进行选择时调用某个函数。除此更改外,您可能还希望在程序启动时填充列表框下面的列表框。为此,请在定义了self.f3ListBox
之后调用self.branches(None)
。在相关问题 更多 >
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