Python 2.7 Tkinter：如何单击并释放两个小部件并同时获得两个小部件的响应？

Question

I hope you can help me with a problem I have in python 2.7. I couldn't find a solution online, but I'm honestly unsure what keywords to search for, so I'm sorry if this is redundant.

The code below is an example of my problem.

import Tkinter as tk

root = tk.Tk()

#Widgets.
btn1 = tk.Label(root, text="btn1", bg="gray80")
btn2 = tk.Label(root, text="btn2", bg="gray80")
btn1.pack(side=tk.TOP, fill=tk.X)
btn2.pack(side=tk.TOP, fill=tk.X)

#Widget events.
def onClick1(event):
    print "Clicked button 1."
def onRelease1(event):
    print "Released button 1."
def onClick2(event):
    print "Clicked button 2."
def onRelease2(event):
    print "Released button 2."

#Bindings.
btn1.bind("<Button-1>", onClick1, add="+")
btn1.bind("<ButtonRelease-1>", onRelease1, add="+")
btn2.bind("<Button-1>", onClick2, add="+")
btn2.bind("<ButtonRelease-1>", onRelease2, add="+")

root.mainloop()

Whenever I click one button (technically a label) and hold it, the onClick event for it fires, but if I drag the mouse over to the other and release it, I get the same onRelease as the one I clicked, and not the one for the label I have my mouse over currently. This has held me back some time now, and I'd hate to scrap the whole feature in my program I need this for, so any help would be greatly appreciated.

Answer 1

The release event always fires on the same widget that got the press event. Within your handler you can ask tkinter what widget is under the cursor.

Example:

import Tkinter as tk

root = tk.Tk()

btn1 = tk.Label(root, text="btn1", bg="gray80")
btn2 = tk.Label(root, text="btn2", bg="gray80")
btn1.pack(side=tk.TOP, fill=tk.X)
btn2.pack(side=tk.TOP, fill=tk.X)

def onRelease(event):
    x,y = event.widget.winfo_pointerxy()
    widget = event.widget.winfo_containing(x, y)
    print("widget:", widget.cget("text"))

btn1.bind("<ButtonRelease-1>", onRelease)
btn2.bind("<ButtonRelease-1>", onRelease)

root.mainloop()