python - Create a fix button with scrollbar in Tkinter -


i run example scrollbar based here. want add button (prev) frame , when scrollbar moves down, button still stay there, while other content moves along scrollbar.

enter image description here

here code:

import tkinter tk  class example(tk.frame):     def __init__(self, root):          tk.frame.__init__(self, root)         self.canvas = tk.canvas(root, borderwidth=0, background="#ffffff")         self.frame = tk.frame(self.canvas, background="#ffffff")         self.vsb = tk.scrollbar(root, orient="vertical", command=self.canvas.yview)         self.canvas.configure(yscrollcommand=self.vsb.set)          self.vsb.pack(side="right", fill="y")         self.canvas.pack(side="left", fill="both", expand=true)         self.canvas.create_window((4,4), window=self.frame, anchor="nw", tags="self.frame")          self.frame.bind("<configure>", self.onframeconfigure)          self.populate()      def populate(self):          button = tk.button(self.frame, text='prev')         button.grid(row=0, columns=1)          row in range(1,100):             tk.label(self.frame, text="%s" % row, width=3, borderwidth="1", relief="solid").grid(row=row, column=0)             t="this second column row %s" %row             tk.label(self.frame, text=t).grid(row=row, column=1)      def onframeconfigure(self, event):         '''reset scroll region encompass inner frame'''         self.canvas.configure(scrollregion=self.canvas.bbox("all"))  if __name__ == "__main__":     root=tk.tk()     example(root).pack(side="top", fill="both", expand=true)     root.mainloop()

can me solve problem? many thanks!

you pack() prefer use grid()

what need place button in root on row 0 , place class frame on row 1 of root. should fix problem.

when using grid() need manage weights of rows , columns growing , shrinking behavior when resize window. can rowconfigute() , columnconfigute(). program need configure weights of root.

to button stay @ left can use sticky = "w" inside of grid() chose side stick to.

take @ below code:

import tkinter tk  class example(tk.frame):     def __init__(self, root):          tk.frame.__init__(self, root)         self.canvas = tk.canvas(root, borderwidth=0, background="#ffffff")         self.frame = tk.frame(self.canvas, background="#ffffff")         self.vsb = tk.scrollbar(root, orient="vertical", command=self.canvas.yview)         self.canvas.configure(yscrollcommand=self.vsb.set)          self.vsb.grid(row = 1, column = 1, sticky = "nsew")         self.canvas.grid(row = 1, column = 0, sticky = "nsew")         self.canvas.create_window((4,4), window=self.frame, anchor="nw", tags="self.frame")          self.frame.bind("<configure>", self.onframeconfigure)          self.populate()      def populate(self):          button = tk.button(root, text='prev')         button.grid(row=0, columns=1, sticky = "w")          row in range(1,100):             tk.label(self.frame, text="%s" % row, width=3, borderwidth="1", relief="solid").grid(row=row, column=0)             t="this second column row %s" %row             tk.label(self.frame, text=t).grid(row=row, column=1)      def onframeconfigure(self, event):         '''reset scroll region encompass inner frame'''         self.canvas.configure(scrollregion=self.canvas.bbox("all"))  if __name__ == "__main__":     root=tk.tk()     root.columnconfigure(0, weight = 1)     root.rowconfigure(1, weight = 1)     example(root).grid(row = 1)     root.mainloop()

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