Python focus_set()和focus_get()方法用法介绍 _focus_set

本文概述

focus_set()方法-
focus_get()方法-

Tkinter具有许多可在任何GUI中提供功能的小部件。它还支持多种通用小部件方法, 这些方法可以应用于任何小部件。
focus_get()
和
focus_set()
方法也是通用的窗口小部件方法。它们也可以应用于
Tk()
方法。
focus_set()方法- 当且仅当主窗口被聚焦时, 此方法用于将焦点设置在所需的小部件上。
语法如下：

widget.focus_set()

以下是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()

输出如下：

文章图片
你可能在上图中观察到按钮小部件有重点。为了更好地理解, 请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窗口小部件的名称。
语法如下：

master.focus_get()

注意：你可以将其与任何窗口小部件一起使用, 不需要使用主窗口。
以下是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()

输出如下：每次你单击任何窗口小部件时, 或者如果你单击上面程序的鼠标按钮-1, 都会打印出具有焦点的窗口小部件的名称。为了更好地理解, 请复制并运行以上程序。