python - tkinter - Weighted Canvas not Filling Empty Space -

canvas takes whole screen can seen green. canvasframe has 2 rows, second of scrolledtext widgets on. second row has been weighted not filling screeen green area should yellow. how the second row fill empty space , scrolled text widgets expand vertically.

p.s. innerframe looks unecessary in example it's there because i've removed other widgets in frame simplicity's sake.

code:

import tkinter tk tkinter import ttk import tkinter.scrolledtext tks  class program(tk.tk):             def __init__(self, *args, **kwargs):         tk.tk.__init__(self, *args, **kwargs)          tk.tk.iconbitmap(self, default = "")         tk.tk.wm_title(self, "")          container = tk.frame(self)         container.pack(side="top", fill="both", expand=true)         container.grid_rowconfigure(0, weight=1)         container.grid_columnconfigure(0, weight=1)          self.frames = {}         f in (page, other):              frame = f(container, self)             self.frames[f] = frame             frame.grid(row = 0, column = 0, sticky = "nsew")          self.show_frame(page)      def show_frame(self,cont):         frame = self.frames[cont]         frame.tkraise()   class page(tk.frame):     def __init__(self, parent, controller):         tk.frame.__init__(self, parent)          innerframe = tk.frame(self, bg="red")         innerframe.place(relx=.5, rely=.5, anchor="c", relwidth=1.0, relheight=1.0)          innerframe.grid_rowconfigure(1, weight=1)         innerframe.grid_columnconfigure(0, weight=1)          frameone = tk.frame(innerframe, bg="green")         frameone.grid(row=1, sticky="nswe")          self.canvas = tk.canvas(frameone, bg="green")          canvasframe = tk.frame(self.canvas, bg="yellow")         canvasframe.pack()          canvasframe.grid_rowconfigure(1, weight=1)          scrollbar = tk.scrollbar(frameone, orient="horizontal", command=self.canvas.xview)         self.canvas.configure(xscrollcommand=scrollbar.set)         scrollbar.pack(side="bottom", fill="x")          self.canvas.pack(fill="both", expand=true)         self.canvas.create_window((0, 0), window=canvasframe, anchor="nw")          x in range(5):             pagename = tk.label(canvasframe, text = "unit name")             pagename.grid(row=0, column=x, sticky="nsew")             text = tks.scrolledtext(canvasframe, width=50)             text.grid(row=1, column=x ,sticky="nsew")          canvasframe.bind("<configure>", self.onframeconfigure)      def onframeconfigure(self, event):         '''reset scroll region encompass inner frame'''         self.canvas.configure(scrollregion=self.canvas.bbox("all"))   class other(tk.frame):     def __init__(self, parent, controller):         tk.frame.__init__(self, parent)  app = program() app.state('zoomed') app.mainloop() 

your canvasframe has no reason expand fill canvas. you've put widgets in it, , frame shrink fit widgets.

the common solution add binding <configure> event of canvas, height of canvas, , use canvas itemconfigure method adjust height of frame same height of canvas.

class page(...):     def __init__(...):         ...         self.frame_id = self.canvas.create_window(...)         ...         self.canvas.bind("<configure>", self.oncanvasconfigure)      def oncanvasconfigure(self, event):         # might need subtract little account borders,         # padding, etc.         self.canvas.itemconfigure(self.frame_id, height=event.height)