Create Tkinter GUIs from JSON definition files

The idea behind this simple module is that you can define Tkinter GUIs in a JSON file format. All value which can be configured for an widget can be defined in those files. The module ‘tkgen’ has an Generator class which is able to parse these files and return you a Tk root.

To use a JSON file as input:

root = tkgen.gengui.TkJson('ui.json', title = 'Some test gui...')
root.mainloop()

Please see the examples in the ‘examples/’ directory for more details on how to use this package.

Module can be retrieved from pypi as well:

easy_install/pip install pytkgen

Some useful Tips

So since the GUI itself is defined in a JSON file you need to lookup the widgets in your python code to do actual operations on them. The gengui module offers some routines which will make your life easy:

get(name) - Returns the Tkinter widget object of the widget with the given name. Requires that a name was indeed defined in the definition file for this widget. Now that you have the object for an Tkinter widget you can do everything which is defined for this particular widget with it using known techniques.
button(name, cmd, […]) - Associates a ‘Button’ widget with a command - For example: ‘root.destroy’.
checkbox(name, […]) - Returns an ‘IntVar’ for a ‘Checkbox’ so you can retrieve the value (0/1) to see if the User checked the box or not.
entry(name, […]) - Returns a ‘StringVar’ for a Entry so you can retrieve and set the value of a Entry widget.
label(name) - Returns a ‘StringVar’ for a Label so you can retrieve and set the value of a Label widget.
create_from_file([…]) - Create a set of widgets from a file and add them to a given parent widget.
notebook([…]) - Adds a tab to a tkk Notebook widget which is itself defined by a JSON file.
treeview([…]) - Adds a item to a given treeview.
toplevel([…]) - Creates a toplevel dialog from a JSON definition file.
create_menu([…]) - Create new menus, popup menus or submenus on the fly.
xscroll and yscroll([…]) - Adds a Horinzontal/Vertical Scrollbar to a widget.

Supported Attributes for Grid placement

On top of all attributes supported by a widget, the following attributes can be used in the JSON files to refine the placement of widgets in the Grid Geometry Manager:

row, column - Define the row and column in which the widget should appear (default: 0).
rowspan, columnspan - Define if the widget should span across multiple rows or columns (default: 1).
rowweight, colweight, weight - Define the weight for a row or column or both (weight). If the weight is set the parent rows/columns are configured automatically to take care of the resizing. (default: 0).
padx, pady - X,Y padding for the widget (default: 2px).
sticky - Defines the sticky attribute as string (default: ‘news’).

Changelog

1.5

Merged several cool contribs (e.g. ttk/tk preference & cleanups) from community
enabled it to work with python 2.* and 3.*

1.4

Support for sticky attribute in the JSON file

1.3

Code optimizations
Support for setting the focus of a widget
More ‘supporting routines’

1.2

Support for creation of menus
Support for multiple frames in JSON
Support for ttk widgets (Treeview, Notebook, Separator, Progressbar, …)
Resizing capabilities added (Weights can now be defined in the JSON file; 1 means the widget resize in general, rowweight=1 means it resize horizontal, colweight=1 means it resize vertical; Values > 1 mean that this widget will resize ‘faster’ (See Tk documentation for more information)).

1.1

Initial

Feel free to play around with this - I do not guarantee that it is perfect nor complete - Have Fun!

pytkgen