Monday, November 29, 2010

Coding Progress

With as crazy busy as my teaching schedule is keeping me this year, it's challenging to find coding time on the weekends and nearly impossible during the week, but with Thanksgiving Break giving me a 5-day weekend, I managed to get another lesson posted and do some serious hacking. The target this time? PDesigner. It hasn't received much attention in quite a while, but it has been a learning experience from its infancy. It's yet another visual GUI designer, but it bears almost no resemblance to anything coming out of Redmond -- or anywhere else, for that matter.

PDesigner is quite different from anything that people might have seen back in the heyday of BeOS because, unlike them, the internal architecture is extremely general. An entire object system had to be created to wrap around each of the control classes available in Haiku. This object system is what sets PDesigner apart from the rest: the project that you are creating manipulates the control objects while they are running -- the GUI is live as you work on it.This might sound like a cool feature that doesn't have much use, but it makes possible something else: scripting from any language. PDesigner's object interface is string-based, so it's pretty easy to write bindings to the object system for any language you can think of. Last summer a group of students from the University of Auckland created a Python interface to PDesigner's object system.

I spent quite a lot of time over the long weekend getting out bugs and expanding its capabilities, such as good support for methods and working around some of the lack of flexibility inherent to the C++ language. Bolting methods onto an object is really easy now. A program of this size is definitely not something that'll be finished next week, but it will open up new possibilities. Here's a screenshot just for your enjoyment. TTFN :-)


  1. Thank you for working on a RAD application for Haiku! I strongly believe that a solid RAD application will greatly increase the speed at which applications are written for Haiku.

    I recently started programming in Python with wxPython and wxGlade (RAD), and have been wanting something similar to work with in Haiku.

    I almost added "a RAD application" to the comments section at the bottom of the Haiku poll, but decided not to. :P

  2. Wow ... Paladin just gets better and better ... thank you DW.