tkinter-nav 0.0.3

Lightweight navigation wrapper for Tkinter

Tkinter-nav

Lightweight navigation wrapper for Tkinter.

Install

pip install tkinter-nav

Usage

Create Some Pages

import tkinter as tk
import tkinter_nav as tknav


class PageOne(tknav.Page):

    def __init__(self, parent):
        tknav.Page.__init__(self, parent, 'name_of_page')

        # Use as any Frame
        # Page extends tk.Frame
        tk.Button(self, ...).pack()

    def page_did_mount(self):
      ...

    def page_did_unmount(self):
      ...


class PageTwo(tknav.Page):
  ...


class PageThree(tknav.Page):
  ...

Create your App

...

class App(tknav.Wrapper):

  def __init__(self):
    # Your pages
    pages = [PageOne, PageTwo]

    tknav.Wrapper.__init__(self, pages)

    # Use as any Tk instance
    # tknav.Wrapper extends tk.Tk
    self.geometry('200x200')
    self.title('My Nav App')

    # Set inital state, not required
    self.app_state = {'foo': 'bar'}

    # Show page
    self.show_page('page_one')


# Run
if __main__ == '__main__':
  App().mainloop()

Pages

Navigate Between Pages

• From the constructor

class PageOne(tknav.Page):

    def __init__(self, parent):
        ...

        tk.Button(
          command=lambda: self.navigate('page_two')
        ).pack()

• From a handler function

class PageOne(tknav.Page):
    ...

    def handleClick(self):
      self.navigate('page_two')

Mount and Unmount

• page_did_mount: When the page is shown
• page_did_unmount: When the page is hidden

Note: You do not have to use them. They will be defined with a <u>pass</u> statement.

class SomePage(tknav.Page):
    ...

    def page_did_mount(self):
      print('Page did mount')

    def page_did_unmount(self):
      print('Page did unmount')

Note: If you are familiar with React, they share the same role as ComponentDidMount and ComponentDidUnmount.

State

You can set a global state for your app which will enable you to share data between pages.

class App(tknav.Nav):

  def __init__(self):
    ...

    self.app_state = {'foo': 'bar'}

class PageOne(tknav.Page):
    ...

    def function(self):
      # get a value
      print(self.app_state['foo']) #bar

      # set a new value
      self.app_state['bar'] = 'foo'

When navigate() is called, the local state is merged with the global state.

class PageTwo(tknav.Page):
    ...

    def function(self):
      print(self.app_state['bar']) #foo

Note: If you are familiar with React, same principle.

Example

Is this example, we navigated from page_one to page_two to page_one again. The state is printed in page_did_mount() and changed in page_did_unmount().