import tkinter as tk


class Container(tk.Frame):
    def __init__(self, parent = None, priority = 3, bg = 'bisque'):
        self.inpList = []
        tk.Frame.__init__(self, parent)

        self.can = tk.Canvas(window, bg = 'aqua')
        self.f = tk.Frame(self.can, bg = bg, height = 200, width = 300)
        self.f.pack(in_ = self.can, fill = 'both', expand = True)
        self.f.propagate(False)
        self.b = tk.Button(self.f, text = 'add', command = lambda: self.add_task(priority))
        self.scb = tk.Scrollbar(self.can)

        self.can.create_window(4, 4, window = self.f)
        self.f.bind("<Configure>", self.on_frame)
        self.can.configure(yscrollcommand = self.scb.set)
        self.scb.configure(command = self.can.yview)

        self.scb.pack(side = 'right', fill = 'y')
        self.can.pack(fill = 'both', expand = True)
        self.b.pack(side = 'left', anchor = 's')

        self.s = tk.Button(self.f, text = 'print all', command = self.print_all)
        self.s.pack(side = 'left')

        self.t = None
        self.saveBtn = None

    def on_frame(self, event):
        self.can.configure(scrollregion = self.can.bbox('all'))

    def add_task(self, priority): # refer 1.2_text for implementation
        finished = False
        self.t = tk.Text(self.f)
        self.t.configure(height = 10, wrap = 'word')
        self.t.bind("<Return>", self.save_task)
        self.t.pack(fill = tk.X)

    def print_all(self):
        print(self.inpList)

    def save_task(self, event):
        td = self.t.get('current linestart', 'current lineend') # 1.0 end-1c
        self.inpList.append(td)

    def to_json(self):
        pass


if __name__ == '__main__':
    window = tk.Tk()
    window.minsize(300, 600)

    p1 = Container(window, priority = 1)
    p2 = Container(window, bg = 'blue', priority = 2)
    p3 = Container(window, bg = 'red', priority = 3)

    window.mainloop()