python - tkinter( python ): assign class method to a key

Question

在我的简单代码中，一个红球沿直线下落(有效)。当我按下右箭头键时，我希望球也向右 move 。但是，这不起作用。我做错了什么？

from tkinter import *

root = Tk()

canvas = Canvas(root, height=400, width=500, background='black')
canvas.pack()


class Bird:
    def __init__(self, canvas, coords):
        self.canvas = canvas
        self.coords = coords
        self.bird = canvas.create_rectangle(coords, fill='red')

    def gravity(self):
        self.canvas.move(self.bird, 0, 10)
        self.canvas.after(200, self.gravity)

    def moveRight(self, event):
        self.canvas.move(self.bird, 10, 0)
        self.canvas.after(200, self.moveRight)

bird = Bird(canvas, (100, 100, 110, 110))

bird.gravity()

canvas.bind('<Right>', bird.moveRight)

root.mainloop()

我还有一个问题:

是否可以为整个 Canvas 调用此“after”函数或类似函数，而不是分别调用这两种方法？

如果您发现我的代码有任何其他缺陷，请告诉我!

谢谢!

Answer 1

必须在类内部将右键绑定(bind)到 Canvas 上，并将焦点设置在 Canvas 上:

from tkinter import *

root = Tk()

canvas = Canvas(root, height=400, width=500, background='black')
canvas.pack()


class Bird:
    def __init__(self, canvas, coords):
        self.canvas = canvas
        self.coords = coords
        self.bird = canvas.create_rectangle(coords, fill='red')
        self.canvas.bind('<Right>', self.moveRight)
        self.canvas.focus_set()

    def gravity(self):
        self.canvas.move(self.bird, 0, 10)
        self.canvas.after(200, self.gravity)

    def moveRight(self, event=None):
        self.canvas.move(self.bird, 10, 0)
        self.canvas.after(200, self.moveRight)


bird = Bird(canvas, (100, 100, 110, 110))

bird.gravity()

root.mainloop()