python - 同时按 2 个键可对角移动 tkinter？

Question

如何使用 2 个键在 Canvas 上移动物体？在有人告诉我我没有做一些研究之前，我已经做了。我之所以还在问这个问题，是因为我不知道他们在说什么。人们正在谈论我不知道的迷你状态和命令。

from tkinter import *

def move(x,y):
    canvas.move(box,x,y)

def moveKeys(event):
    key=event.keysym
    if key =='Up':
        move(0,-10)
    elif key =='Down':
    move(0,10)
    elif key=='Left':
    move(-10,0)
    elif key=='Right':
        move(10,0)

window =Tk()
window.title('Test')

canvas=Canvas(window, height=500, width=500)
canvas.pack()

box=canvas.create_rectangle(50,50,60,60, fill='blue')
canvas.bind_all('<Key>',moveKeys)

有什么方法可以让我同时移动 2 个键吗？我希望使用这种格式来完成，而不是使用迷你状态。

Answer 1

如果你说的“迷你状态”方法指的是这个答案( Python bind - allow multiple keys to be pressed simultaneously )，其实也不难理解。

请参阅下面的代码的修改和注释版本，它遵循这一理念:

from tkinter import tk

window = tk.Tk()
window.title('Test')

canvas = tk.Canvas(window, height=500, width=500)
canvas.pack()

box = canvas.create_rectangle(50, 50, 60, 60, fill='blue')

def move(x, y):
    canvas.move(box, x, y)

# This dictionary stores the current pressed status of the (← ↑ → ↓) keys
# (pressed: True, released: False) and will be modified by Pressing or Releasing each key
pressedStatus = {"Up": False, "Down": False, "Left": False, "Right": False}

def pressed(event):
    # When the key "event.keysym" is pressed, set its pressed status to True
    pressedStatus[event.keysym] = True

def released(event):
    # When the key "event.keysym" is released, set its pressed status to False
    pressedStatus[event.keysym] = False

def set_bindings():
    # Bind the (← ↑ → ↓) keys's Press and Release events
    for char in ["Up", "Down", "Left", "Right"]:
        window.bind("<KeyPress-%s>" % char, pressed)
        window.bind("<KeyRelease-%s>" % char, released)

def animate():
    # For each of the (← ↑ → ↓) keys currently being pressed (if pressedStatus[key] = True)
    # move in the corresponding direction
    if pressedStatus["Up"] == True: move(0, -10)
    if pressedStatus["Down"] == True: move(0, 10)
    if pressedStatus["Left"] == True: move(-10, 0)
    if pressedStatus["Right"] == True: move(10, 0)
    canvas.update()
    # This method calls itself again and again after a delay (80 ms in this case)
    window.after(80, animate)

# Bind the (← ↑ → ↓) keys's Press and Release events
set_bindings()

# Start the animation loop
animate()

# Launch the window
window.mainloop()