不幸的是，您在某种程度上受制于系统的基础自动重复机制。例如，在Mac上，如果按住“ w”键，我将获得一连串的新闻发布事件。在按下的同时，如果我按下“ o”，我会得到一系列的新闻，并发布“ o”的新闻，但没有更多的“ w”事件。
您将需要设置一个迷你状态机，并绑定到按键和按键释放事件。这将使您跟踪哪些按键被按下，哪些按键未被按下。然后，每次绘制框架时，您都可以查询机器以查看按下了哪些键并采取相应的措施。
这是我一起提出的快速技巧。我只在我的Mac上测试过，并且仅在python 2.5上测试过。我没有真正尝试过“ Pythonic”或高效。该代码仅用于说明该技术。使用此代码，您可以同时按下“ w”或“ s”以及“ o”或“ l”来上下移动两个拨片。
'''Example that demonstrates keeping track of multiple key events'''
from Tkinter import *
class Playfield:
def __init__(self):
# this dict keeps track of keys that have been pressed but not
# released
self.pressed = {}
self._create_ui()
def start(self):
self._animate()
self.root.mainloop()
def _create_ui(self):
self.root = Tk()
self.p1label = Label(text="press w, s to move player 1 up, down",
anchor="w")
self.p2label = Label(text="press o, l to move player 2 up, down",
anchor="w")
self.canvas = Canvas(width=440, height=440)
self.canvas.config(scrollregion=(-20, -20, 420, 420))
self.p1label.pack(side="top", fill="x")
self.p2label.pack(side="top", fill="x")
self.canvas.pack(side="top", fill="both", expand="true")
self.p1 = Paddle(self.canvas, tag="p1", color="red", x=0, y=0)
self.p2 = Paddle(self.canvas, tag="p2", color="blue", x=400, y=0)
self._set_bindings()
def _animate(self):
if self.pressed["w"]: self.p1.move_up()
if self.pressed["s"]: self.p1.move_down()
if self.pressed["o"]: self.p2.move_up()
if self.pressed["l"]: self.p2.move_down()
self.p1.redraw()
self.p2.redraw()
self.root.after(10, self._animate)
def _set_bindings(self):
for char in ["w","s","o", "l"]:
self.root.bind("<KeyPress-%s>" % char, self._pressed)
self.root.bind("<KeyRelease-%s>" % char, self._released)
self.pressed[char] = False
def _pressed(self, event):
self.pressed[event.char] = True
def _released(self, event):
self.pressed[event.char] = False
class Paddle():
def __init__(self, canvas, tag, color="red", x=0, y=0):
self.canvas = canvas
self.tag = tag
self.x = x
self.y = y
self.color = color
self.redraw()
def move_up(self):
self.y = max(self.y -2, 0)
def move_down(self):
self.y = min(self.y + 2, 400)
def redraw(self):
x0 = self.x - 10
x1 = self.x + 10
y0 = self.y - 20
y1 = self.y + 20
self.canvas.delete(self.tag)
self.canvas.create_rectangle(x0,y0,x1,y1,tags=self.tag, fill=self.color)
if __name__ == "__main__":
p = Playfield()
p.start()
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