为什么添加自定义菜单会破坏 Python3/tkinter 中的键盘事件绑定?
Why does adding a custom menu break keyboard event binding in Python3/tkinter?
在下面的代码中,当我按下按钮添加一些辅助 windows,然后尝试使用 "Command-w" 关闭 window 它并不总是关闭活动window。但是,如果我通过注释 self.gerar_menu()
行来禁用菜单创建,windows 将按预期打开和关闭(我的意思是,通过单击红色 'x' 按钮或在 OSX)。知道这里出了什么问题吗?
这是我当前的测试代码:
#!/usr/bin/env python3.6
# encoding: utf-8
import tkinter as tk
import tkinter.font
from tkinter import ttk
class baseApp(ttk.Frame):
"""
Parent classe for main app window (will include some aditional methods and properties).
"""
def __init__(self, master, *args, **kwargs):
super().__init__(master, *args, **kwargs)
self.master = master
self.mainframe = ttk.Frame(master)
self.mainframe.pack()
class App(baseApp):
""" Base class for the main application window """
def __init__(self, master, *args, **kwargs):
super().__init__(master, *args, **kwargs)
self.master = master
#self.gerar_menu() # This line breaks "Command-w" functionality
self.lbl_text = ttk.Label(self.mainframe, text="This is the Main Window")
self.lbl_text.pack()
self.btn = ttk.Button(self.mainframe, text="Open Second window",
command=lambda: self.create_detail_window(self, number=0))
self.btn.pack()
self.newDetailsWindow = {}
self.windows_count=0
def gerar_menu(self):
""" generate the application menu """
self.menu = tk.Menu(root)
root.config(menu=self.menu)
self.fileMenu = tk.Menu(self.menu)
self.menu.add_cascade(label="File", menu=self.fileMenu)
self.fileMenu.add_command(label="New Document", command=None, accelerator="Command+n")
def create_detail_window(self, *event, number=None):
self.windows_count += 1
self.newDetailsWindow[self.windows_count]=tk.Toplevel()
self.newDetailsWindow[self.windows_count].geometry('900x600+80+130')
self.newDetailsWindow[self.windows_count].title(f'Detail: {self.windows_count}')
self.newDetailsWindow[self.windows_count].wm_protocol("WM_DELETE_WINDOW", self.newDetailsWindow[self.windows_count].destroy)
self.newDetailsWindow[self.windows_count].bind("Command-w", lambda event: self.newDetailsWindow[-1].destroy())
self.detail_window = detailWindow(self.newDetailsWindow[self.windows_count], self.windows_count)
self.newDetailsWindow[self.windows_count].focus()
print(self.newDetailsWindow)
class detailWindow(ttk.Frame):
""" Base class for secondary windows """
def __init__(self, master, rep_num, *args,**kwargs):
super().__init__(master,*args,**kwargs)
self.num_rep = rep_num
self.master.minsize(900, 600)
self.master.maxsize(900, 600)
print(f"Showing details about nr. {self.num_rep}")
self.mainframe = ttk.Frame(master)
self.mainframe.pack()
self.lbl_text = ttk.Label(self.mainframe,
text=f"Showing details about nr. {self.num_rep}")
self.lbl_text.pack()
if __name__ == "__main__":
root = tk.Tk()
janela_principal = App(root)
root.title('Main Window')
root.bind_all("<Mod2-q>", exit)
root.mainloop()
如果您想创建一个绑定来关闭 window,您需要函数来对接收到事件的实际 window 起作用。无论哪个 window 收到事件,您的代码总是删除最后打开的 window。
第一步是绑定到函数而不是使用 lambda
。虽然 lambda
有其用途,但绑定到命名函数更容易调试和维护。
调用函数后,事件对象可以通过 event
对象的 widget
属性告诉您哪个 window 获得了事件。鉴于此 window,您可以通过 winfo_toplevel
命令获取此 window 所在的顶层 window(或本身,如果它是顶层 window)。
例如:
window = tk.Toplevel(...)
...
window.bind("<Command-w>", self.destroy_window)
...
def destroy_window(self, event):
window = event.widget.winfo_toplevel()
window.destroy()
在下面的代码中,当我按下按钮添加一些辅助 windows,然后尝试使用 "Command-w" 关闭 window 它并不总是关闭活动window。但是,如果我通过注释 self.gerar_menu()
行来禁用菜单创建,windows 将按预期打开和关闭(我的意思是,通过单击红色 'x' 按钮或在 OSX)。知道这里出了什么问题吗?
这是我当前的测试代码:
#!/usr/bin/env python3.6
# encoding: utf-8
import tkinter as tk
import tkinter.font
from tkinter import ttk
class baseApp(ttk.Frame):
"""
Parent classe for main app window (will include some aditional methods and properties).
"""
def __init__(self, master, *args, **kwargs):
super().__init__(master, *args, **kwargs)
self.master = master
self.mainframe = ttk.Frame(master)
self.mainframe.pack()
class App(baseApp):
""" Base class for the main application window """
def __init__(self, master, *args, **kwargs):
super().__init__(master, *args, **kwargs)
self.master = master
#self.gerar_menu() # This line breaks "Command-w" functionality
self.lbl_text = ttk.Label(self.mainframe, text="This is the Main Window")
self.lbl_text.pack()
self.btn = ttk.Button(self.mainframe, text="Open Second window",
command=lambda: self.create_detail_window(self, number=0))
self.btn.pack()
self.newDetailsWindow = {}
self.windows_count=0
def gerar_menu(self):
""" generate the application menu """
self.menu = tk.Menu(root)
root.config(menu=self.menu)
self.fileMenu = tk.Menu(self.menu)
self.menu.add_cascade(label="File", menu=self.fileMenu)
self.fileMenu.add_command(label="New Document", command=None, accelerator="Command+n")
def create_detail_window(self, *event, number=None):
self.windows_count += 1
self.newDetailsWindow[self.windows_count]=tk.Toplevel()
self.newDetailsWindow[self.windows_count].geometry('900x600+80+130')
self.newDetailsWindow[self.windows_count].title(f'Detail: {self.windows_count}')
self.newDetailsWindow[self.windows_count].wm_protocol("WM_DELETE_WINDOW", self.newDetailsWindow[self.windows_count].destroy)
self.newDetailsWindow[self.windows_count].bind("Command-w", lambda event: self.newDetailsWindow[-1].destroy())
self.detail_window = detailWindow(self.newDetailsWindow[self.windows_count], self.windows_count)
self.newDetailsWindow[self.windows_count].focus()
print(self.newDetailsWindow)
class detailWindow(ttk.Frame):
""" Base class for secondary windows """
def __init__(self, master, rep_num, *args,**kwargs):
super().__init__(master,*args,**kwargs)
self.num_rep = rep_num
self.master.minsize(900, 600)
self.master.maxsize(900, 600)
print(f"Showing details about nr. {self.num_rep}")
self.mainframe = ttk.Frame(master)
self.mainframe.pack()
self.lbl_text = ttk.Label(self.mainframe,
text=f"Showing details about nr. {self.num_rep}")
self.lbl_text.pack()
if __name__ == "__main__":
root = tk.Tk()
janela_principal = App(root)
root.title('Main Window')
root.bind_all("<Mod2-q>", exit)
root.mainloop()
如果您想创建一个绑定来关闭 window,您需要函数来对接收到事件的实际 window 起作用。无论哪个 window 收到事件,您的代码总是删除最后打开的 window。
第一步是绑定到函数而不是使用 lambda
。虽然 lambda
有其用途,但绑定到命名函数更容易调试和维护。
调用函数后,事件对象可以通过 event
对象的 widget
属性告诉您哪个 window 获得了事件。鉴于此 window,您可以通过 winfo_toplevel
命令获取此 window 所在的顶层 window(或本身,如果它是顶层 window)。
例如:
window = tk.Toplevel(...)
...
window.bind("<Command-w>", self.destroy_window)
...
def destroy_window(self, event):
window = event.widget.winfo_toplevel()
window.destroy()