Python 如何在 Tkinter 中将点击事件绑定到 Canvas？
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How to bind a click event to a Canvas in Tkinter?
提问by lukejano
I was just wondering if there was any possible way to bind a click event to a canvas in Tkinter.
我只是想知道是否有任何可能的方法将点击事件绑定到 Tkinter 中的画布。
I would like to be able to click anywhere on a canvas and have an object move to it. I am able to make the motion, yet I have not found a way to bind a click event on a canvas.
我希望能够单击画布上的任意位置并将对象移动到它。我能够做出动作，但我还没有找到在画布上绑定点击事件的方法。
采纳答案by Malik Brahimi
Taken straight from an example from an Effbot tutorialon events.
直接取自 Effbot事件教程中的示例。
In this example, we use the bind method of the frame widget to bind a callback function to an event called . Run this program and click in the window that appears. Each time you click, a message like “clicked at 44 63” is printed to the console window. Keyboard events are sent to the widget that currently owns the keyboard focus. You can use the focus_set method to move focus to a widget:
在此示例中，我们使用框架小部件的 bind 方法将回调函数绑定到名为 的事件。运行此程序并在出现的窗口中单击。每次单击时，控制台窗口都会打印一条消息，例如“在 44 63 处单击”。键盘事件被发送到当前拥有键盘焦点的小部件。您可以使用 focus_set 方法将焦点移动到小部件：
from Tkinter import *
root = Tk()
def key(event):
print "pressed", repr(event.char)
def callback(event):
print "clicked at", event.x, event.y
canvas= Canvas(root, width=100, height=100)
canvas.bind("<Key>", key)
canvas.bind("<Button-1>", callback)
canvas.pack()
root.mainloop()
Update:The example above will not work for 'key' events if the window/frame contains a widget like a Tkinter.Entry widget that has keyboard focus. Putting:
更新：如果窗口/框架包含像具有键盘焦点的 Tkinter.Entry 小部件这样的小部件，则上面的示例将不适用于“键”事件。推杆：
canvas.focus_set()
in the 'callback' function would give the canvas widget keyboard focus and would cause subsequent keyboard events to invoke the 'key' function (until some other widget takes keyboard focus).
在“回调”函数中，会给画布小部件键盘焦点，并导致后续键盘事件调用“键”函数（直到其他一些小部件获得键盘焦点）。
