用户定义及系统预定义虚拟事件

import tkinter as tk
from tkinter import ttk, messagebox

root = tk.Tk()
root.title("root")
root.state(newstate='iconic') # 最小化主窗体

def rquit(virtual_event): # 传入虚拟事件
    messagebox.showinfo(message='Quit right now')
    # print(root.focus_get()) # 获得焦点的部件
    root.quit()

root.event_add('<<Quit>>', '<Control-q>')  # 增加虚拟键盘映射
root.bind(sequence='<<Quit>>', func=rquit) # 绑定虚拟事件和方法将虚拟事件传入rquit方法


toolbar=tk.Menu()
root['menu'] = toolbar
files = tk.Menu(toolbar)
toolbar.add_cascade(menu=files, label='files')
files.add_command(label="Quit",accelerator='   Ctrl+Q', activebackground='yellow', # 激活背景色
    underline=0, activeforeground='red', # 激活字体色
        command=root.quit)
    
files.add_command(label='Cut', accelerator='    Ctrl+X', \
    underline=2, \
        command=lambda: entry.focus_get().event_generate('<<Cut>>')) # 调用系统预定义事件

files.add_command(label='Copy', accelerator='    Ctrl+C', \
    underline=0, \
        command=lambda: entry.focus_get().event_generate('<<Copy>>')) # 调用系统预定义事件

files.add_command(label='Paste', accelerator='    Ctrl+V', \
    underline=0, \
        command=lambda: entry.focus_get().event_generate('<<Paste>>')) # 调用系统预定义事件（仅当获取焦点时）

files.add_command(label='Clear', underline=0, \
        command=lambda: entry.focus_get().event_generate('<<Clear>>')) 

files.add_command(label='Undo', underline=0, \
        command=lambda: entry.event_generate('<<Undo>>')) #? 无效？

'''系统预定义虚拟事件无需重新绑定触发事件'''

def getv(event):
    lblvar.set(str.get() + '\n')
    print(lblvar.get())




str = tk.StringVar()
entry=ttk.Entry(root, textvariable=str)
entry.grid(column=0, row=0, sticky=(tk.N, tk.W, tk.E))
#// root.bind('<Return>', lambda event: messagebox.showinfo(message='Scan success!'))
root.bind('<Return>', lambda event: str.set(str.get() + '\n'))
root.grid_columnconfigure(0, weight=1)
lblvar = tk.StringVar(value='default content')
lbl = ttk.Label(root, textvariable=lblvar, justify='center', anchor='center',\
    wraplength=root.winfo_reqwidth()/3)
lbl.grid(column=0, row=1, sticky='news')
root.grid_rowconfigure(1, weight=1)
root.bind('<KeyPress>', getv)

#! 设置系统窗口左上角对应菜单
def menuSet():
    global win 
    win = tk.Toplevel(root)
    win.title("toplevel")
    menubar = tk.Menu(win)
    win['menu'] = menubar
    sysmenu = tk.Menu(menubar, name='system')
    menubar.add_cascade(menu=sysmenu, label='Other...')

menuSet()


#!Contextual Menus 右键弹出菜单
contextual = tk.Menu(root)
contextual.add_command(label='Cut', command=lambda: entry.focus_get().event_generate('<<Cut>>'))
contextual.add_command(label='Copy', command=lambda: entry.focus_get().event_generate('<<Copy>>'))
contextual.add_command(label='Paste', command=lambda: entry.focus_get().event_generate('<<Paste>>'))

if root.tk.call('tk','windowingsystem') == 'win32': # 判断系统类型
    root.bind('<Button-3>', lambda e: contextual.post(e.x_root,e.y_root)) 
    win.bind('<Button-3>', lambda e: contextual.post(e.x_root,e.y_root)) 
    # x_root/y_root相对事件窗体的坐标，不指定则为相对屏幕坐标
else:
    messagebox.showerror(message='Unknown System')

root.mainloop()

常用的系统预定义事件

<<Clear>>, <<Copy>>, <<Cut>>, <<Paste>>, <<PasteSelection>>,<<PrevWindow>>,

<<Redo>>, and <<Undo>>.

For additional information, see the event command reference.