我有一個可滾動框架，鼠標滾輪綁定到滾動，但是當框架小于畫布時，我可以在其上方滾動 - 如何將框架保持在畫布頂部？這是代碼的最小版本：import tkinter as tkclass 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()
1 回答
阿波羅的戰車
TA貢獻1862條經驗 獲得超6個贊
您可以定義自己的yview()方法，僅當畫布的全部內容不可見時才進行滾動。為此，我使用了，如果所有畫布內容都可見，self.canvas.yview()則返回。(0.0, 1.0)然后我使用自定義yview()方法作為滾動條命令和鼠標滾輪綁定。
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.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.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()
def yview(self, *args):
if self.canvas.yview() == (0.0, 1.0):
return
self.canvas.yview(*args)
if __name__ == "__main__":
root = tk.Tk()
gui = Gui(root)
root.mainloop()
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