有没有办法从事件中提取画布对象的id?
例如,我想将一个项目添加到画布并绑定到它 - 但是如果我在画布上有多个项目,我需要区分它们。
def add_canvas_item(self,x,y):
canvas_item_id = self.canvas.create_oval(x-50,y-50,x+50,y+50, fill='green')
self.canvas.tag_bind(canvas_item_id ,"<ButtonPress-1>",self.stateClicked)
def itemClicked(self,event):
print("Item XYZ Clicked!") <- Where XYZ is the ID of the item
我有一些非常“hacky”的方法(跟踪鼠标,并向画布询问最近的项目到那一点),但这似乎不是“最好”的方式。
有没有更好的办法?
您可以使用find_withtag()
函数返回单击的项目,如下例所示:
from tkinter import *
root = Tk()
canvas = Canvas(root)
canvas.pack()
def itemClicked(event):
canvas_item_id = event.widget.find_withtag('current')[0]
print('Item', canvas_item_id, 'Clicked!')
def add_canvas_item(x,y):
canvas_item_id = canvas.create_oval(x-50,y-50,x+50,y+50, fill='green')
canvas.tag_bind(canvas_item_id ,'<ButtonPress-1>', itemClicked)
add_canvas_item(100,100) # Test item 1
add_canvas_item(250,150) # Test item 2
root.mainloop()