Python Tkinter 按钮命令在运行程序时激活？
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Tkinter button command activates upon running program?
提问by Doktor J
I'm trying to make a build retrieval form, and seem to have issues with the buttons... I'm a novice at Python/tkinter GUI programming (and GUI programming in general) and borrowed the skeleton of a Hello World app, and sorta built off that.
我正在尝试制作一个构建检索表单，但按钮似乎有问题......我是 Python/tkinter GUI 编程（以及一般的 GUI 编程）的新手，并借用了 Hello World 应用程序的框架，有点建立在这一点上。
In the code below, I've set the "command" option of my Browse button to call my class's internal get_dir() function when it's clicked. However, as soon as I attempt to run the app, the get_dir() function is called and I'm prompted to choose a directory. Any ideas why this happens, and what I can do to make it behave properly?
在下面的代码中，我设置了浏览按钮的“命令”选项，以便在单击时调用类的内部 get_dir() 函数。但是，一旦我尝试运行该应用程序，就会调用 get_dir() 函数并提示我选择一个目录。任何想法为什么会发生这种情况，以及我可以做些什么来使其行为正常？
from Tkinter import *
import tkFont
from tkFileDialog import askdirectory
class App:
def __init__(self, master):
fontHead = tkFont.Font(family="Arial", size=10, weight=tkFont.BOLD)
fontBold = tkFont.Font(family="Arial", size=8, weight=tkFont.BOLD)
fontReg = tkFont.Font(family="Arial", size=8)
frameN = Frame(master)
frameN.grid(row=0,padx=5,pady=5)
frameXBH = Frame(frameN)
frameXBH.grid(row=0,columnspan=5,padx=5)
Canvas(frameXBH,borderwidth=0,relief="flat",height=1,width=20,background="#cccccc").grid(row=0)
Label(frameXBH, text="Xbox 360",font=fontBold,width=9).grid(row=0,column=1)
Canvas(frameXBH,borderwidth=0,relief="flat",height=1,width=440,background="#cccccc").grid(row=0,column=2,sticky="WE")
Label(frameN, text="Destination Path:",font=fontReg).grid(row=1,sticky="W")
xbPath = Entry(frameN,width=30,font=fontReg)
xbPath.grid(row=1,column=1,sticky="W")
xbBrowse = Button(frameN,text="Browse...",font=fontReg,command=self.get_dir(xbPath))
xbBrowse.grid(row=1,column=2,sticky="W")
xbRel = Checkbutton(frameN,text="Release",font=fontReg)
xbRel.grid(row=1,column=3,sticky="W")
xbShip = Checkbutton(frameN,text="Ship",font=fontReg)
xbShip.grid(row=1,column=4,sticky="W")
Canvas(frameN,borderwidth=1,relief="groove",width=550,height=0).grid(row=2,columnspan=5,pady=10)
# SAVE AND CANCEL
btnSave = Button(frameN,text="Save",width=10)
btnSave.grid(row=3,column=3,sticky="E")
btnCancel = Button(frameN,text="Cancel",width=10)
btnCancel.grid(row=3,column=4,sticky="W")
def get_dir(self,box):
tmp = askdirectory(mustexist=1,title="Please select a destination")
tmp = tmp.replace("/","\")
box.delete(0,END)
box.insert(0,tmp)
root = Tk()
root.resizable(0,0)
app = App(root)
root.mainloop()
采纳答案by Kendall
Make your event handler a lambda function, which calls your get_dir()with whatever arguments you want:
使您的事件处理程序成为lambda 函数，它get_dir()使用您想要的任何参数调用您：
xbBrowse = Button(frameN, text="Browse...", font=fontReg, command=lambda : self.get_dir(xbPath))
回答by pyfunc
In the above code:
在上面的代码中：
xbBrowse = Button(frameN,text="Browse...",font=fontReg,command=self.get_dir(xbPath))
You are invoking the function already, you should be simply passing the function:
您已经在调用该函数，您应该简单地传递该函数：
xbBrowse = Button(frameN,text="Browse...",font=fontReg,command=self.get_dir)
回答by volting
You need to pass a reference of your get_dirmethod
您需要传递您的get_dir方法的引用
so change
所以改变
xbBrowse = Button(frameN,text="Browse...",font=fontReg,command=self.get_dir(xbPath))
to
到
xbBrowse = Button(frameN,text="Browse...",font=fontReg, command=self.get_dir)
Then make your Entrywidget an instance variable so that you can access it in your get_dirmethod.
然后让您的Entry小部件成为一个实例变量，以便您可以在您的get_dir方法中访问它。
e.g.
例如
self.xbPath = Entry(frameN,width=30,font=fontReg)
Then your get_dir()method will look like:
然后你的get_dir()方法看起来像：
def get_dir(self):
tmp = askdirectory(mustexist=1,title="Please select a destination")
tmp = tmp.replace("/","\")
self.xbPath.delete(0,END)
self.xbPath.insert(0,tmp)
