This is for example a create_text:
self.__canvas.create_text(350, lineVotes, text=str(likesPrinted),
font=("calibri", 30), fill="#66FF99", anchor=E)
How could I delete this with a button?
This is for example a create_text:
self.__canvas.create_text(350, lineVotes, text=str(likesPrinted),
font=("calibri", 30), fill="#66FF99", anchor=E)
How could I delete this with a button?
一种方法是使用所有对象构造函数返回的对象 ID :Canvas
self.text_id = self.__canvas.create_text(350, lineVotes,
text=str(likesPrinted),
font=("calibri", 30),
fill="#66FF99", anchor=E)
然后你可以像这样使用Canvas
对象的delete()
方法:
self.__canvas.delete(self.text_id)
另一种方法是将标签附加到Canvas
对象上,并使用它:
self.__canvas.create_text(350, lineVotes,
text=str(likesPrinted),
font=("calibri", 30), fill="#66FF99", anchor=E,
tag="some_tag")
然后将标签delete()
而不是对象 ID 传递给方法:
self.__canvas.delete("some_tag")
标签的名称可以是任何不包含空格或句点的字符串。
标签更强大,因为您可以将同一个对象分配给多个对象,然后将它们作为一个组进行操作。相反,一个对象可以通过指定一个元组来附加多个标签:即tag=("1234", "@special", "posn:13,42")
在构造函数调用中。
要在Button
单击 a 时实现这一点,您还需要定义一个函数或方法,以便在调用上述Canvas
方法之一时对其进行调用。然后,在创建按钮小部件时,通过command=
配置选项指定其名称。
例如(在class
定义内):
class Class:
...
def create_widgets(self):
self.text_id = self.__canvas.create_text(350, lineVotes, text=str(likesPrinted),
font=("calibri", 30), fill="#66FF99",
anchor=E)
self.delete_btn = Button(root, text="Delete text", command=self.delete_text)
self.delete_btn.pack()
def delete_text(self):
""" Delete the canvas text object. """
if self.text_id:
self.__canvas.delete(self.text_id)
self.text_id = None # To avoid multiple deletions.