我有一个带有鼠标滚轮绑定滚动功能的可滚动框架,但当框架小于画布时,我能够在其上方滚动 - 我该如何使框架保持在画布顶部?
以下是代码的最简版本:
import tkinter as tk
class Gui:
def __init__(self, master):
self.root = master
self.canvas = tk.Canvas(self.root)
self.frame = tk.Frame(self.canvas,bg='white')
self.scroll = tk.Scrollbar(self.canvas,orient='vertical', command=self.canvas.yview)
self.canvas.configure(yscrollcommand=self.scroll.set)
self.scroll.pack(side='right', fill='y')
self.canvas.place(relheight=1, relwidth=0.85, relx=0.15)
self.canvas_frame = self.canvas.create_window((0,0), window=self.frame, anchor='nw')
self.frame.bind('<Configure>', self.onFrameConfigure)
self.canvas.bind_all('<MouseWheel>', lambda event: self.canvas.yview_scroll(int(-1*(event.delta/120)), 'units'))
self.addToFrame()
def onFrameConfigure(self, event):
self.canvas.configure(scrollregion=self.canvas.bbox('all'))
def addToFrame(self):
self.label = tk.Label(self.frame,text='Label')
self.label.pack()
if __name__ == "__main__":
root = tk.Tk()
gui = Gui(root)
root.mainloop()