需要创建一个泛型函数,在事件上它会将聚焦小部件返回到其默认值。有没有办法实现这个目标?
示例:
entry1 = Tkinter.Entry()
entry1.grid(..)
entry1.insert(0,"hello")
entry1.bind("<FocusIn>", EntryFocusedIn)
entry1.bind("<FocusOut>", EntryFocusedOut)
entry2 = Tkinter.Entry()
entry2.grid(..)
entry2.insert(0,"again")
entry2.bind("<FocusIn>", EntryFocusedIn)
entry2.bind("<FocusOut>", EntryFocusedOut)
def EntryFocusedIn(params):
params.widget.delete(0, Tkinter.END)
def EntryFocusedOut(params):
# return widget to its default value
# which in case of entry1 its "hello"
# and in case of entry2 its "again"
答案 0 :(得分:4)
您可以继承Entry
小部件以添加属性以存储默认值,并在事件处理程序中引用该属性。但是,没有什么能阻止您直接将自己的属性直接添加到每个Entry
窗口小部件,例如entry1.default_value = 'hello'
,entry1.default_value = 'again'
:
import Tkinter
def EntryFocusedIn(params):
params.widget.delete(0, Tkinter.END)
def EntryFocusedOut(params):
# restore default value
params.widget.delete(0, Tkinter.END)
params.widget.insert(0, params.widget.default_value)
root = Tkinter.Tk()
entry1 = Tkinter.Entry()
entry1.default_value = 'hello'
entry1.pack()
entry1.insert(0, entry1.default_value)
entry1.bind("<FocusIn>", EntryFocusedIn)
entry1.bind("<FocusOut>", EntryFocusedOut)
entry2 = Tkinter.Entry()
entry2.default_value = 'again'
entry2.pack()
entry2.insert(0, entry2.default_value)
entry2.bind("<FocusIn>", EntryFocusedIn)
entry2.bind("<FocusOut>", EntryFocusedOut)
root.mainloop()