Python | focus_set()和 focus_get()方法
原文:https://www . geesforgeks . org/python-focus _ set-and-focus _ get-method/
Tkinter 有许多小部件可以在任何图形用户界面中提供功能。它还支持各种通用的小部件方法，这些方法可以应用于任何小部件。
focus_get()``focus_set()方法也是通用的 widget 方法。它们也可以应用于Tk()法。
focus_set()方法-
当且仅当主窗口聚焦时，此方法用于将焦点设置在所需的小部件上。
语法:
widget.focus_set()
下面是 Python 程序——
# Importing tkinter module
# and all functions
from tkinter import *
from tkinter.ttk import *
# creating master window
master = Tk()
# Entry widget
e1 = Entry(master)
e1.pack(expand = 1, fill = BOTH)
# Button widget which currently has the focus
e2 = Button(master, text ="Button")
# here focus_set() method is used to set the focus
e2.focus_set()
e2.pack(pady = 5)
# Radiobuton widget
e3 = Radiobutton(master, text ="Hello")
e3.pack(pady = 5)
# Infinite loop
mainloop()
输出:
在上图中可以观察到有焦点。为了更好的理解复制并运行以上程序。
focus_get()方法-
此方法返回当前具有焦点的小部件的名称。
语法:
master.focus_get()
注意:你可以用它搭配任何的小部件，高手在没必要。
下面是 Python 程序–
# Importing tkinter module
# and all functions
from tkinter import *
from tkinter.ttk import *
# creating master window
master = Tk()
# This method is used to get
# the name of the widget
# which currently has the focus
# by clicking Mouse Button-1
def focus(event):
widget = master.focus_get()
print(widget, "has focus")
# Entry widget
e1 = Entry(master)
e1.pack(expand = 1, fill = BOTH)
# Button Widget
e2 = Button(master, text ="Button")
e2.pack(pady = 5)
# Radiobutton widget
e3 = Radiobutton(master, text ="Hello")
e3.pack(pady = 5)
# Here function focus() is binded with Mouse Button-1
# so every time you click mouse, it will call the
# focus method, defined above
master.bind_all("<Button-1>", lambda e: focus(e))
# infinite loop
mainloop()
输出:每次点击任意一个小部件或者如果点击鼠标按键-1 以上程序都会打印出有焦点的小部件的名称。为了更好地理解复制和运行上述程序。
.!radiobutton has focus
.!entry has focus
.!button has focus
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