使用Tkinter中的滚动条创建修复按钮

Question

我运行一个基于here的滚动条示例。但是我想添加一个按钮（Prev）到框架中，当滚动条向下移动时，此按钮仍然保持在那里，而其他内容随滚动条一起移动。

这里是我的代码：

import Tkinter as 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) 

     for 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 is the second column for row %s" %row 
      tk.Label(self.frame, text=t).grid(row=row, column=1) 

    def onFrameConfigure(self, event): 
     '''Reset the scroll region to encompass the 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() 

谁能帮我解决这个问题呢？非常感谢！

Answer 1

您可以用pack()做到这一点很好，但我更喜欢使用grid()

你需要做的是发生在0行根按钮，并将该类框架根的第1行。这应该可以解决你的问题。

当使用grid()时，我们需要管理行和列的权重，以便在调整窗口大小时获得不断增长和缩小的行为。我们可以用rowconfigute()和columnconfigute()来做到这一点。对于这个程序，我们需要配置根权重。

要让按钮保持在左边，我们可以使用sticky = "w"在grid()内选择要坚持的一面。

在下面的代码看看：

import tkinter as 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") 

     for 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 is the second column for row %s" %row 
      tk.Label(self.frame, text=t).grid(row=row, column=1) 

    def onFrameConfigure(self, event): 
     '''Reset the scroll region to encompass the 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()