[Opengc-devel] opengc message passing

[Damion S. <dam...@ho...>]

Hi,

An early version of message passing in OpenGC is now working. Messages are 
of type ogcMessage, an enumerated type defined in ogcMessages.h. A message 
may be dispatched by the appobject and consists of an ogcMessage defined in 
the messages header and a void pointer to an arbitrary piece of data. Many 
times the void pointer will just be null. This is loosely similar to the 
message passing style in many windowing interfaces.

Messages can be generated in a variety of ways, including (but not limited 
to):

1) Keyboard events
2) Mouse click events
3) Internal events within gauges (if a gauge does processing of some sort 
and decides it needs to inform the world of the results).
4) Other internal events within OpenGC (RenderWindow, App, etc.)

I have not yet implemented the ability to read text file definitions for 
mapping key presses to messages, although I hope to by early next week.

For now, I've implemented a simple gauge called ogcKeypad which consists of 
a numerical keypad (telephone style) and calculator style display. Hitting 
buttons with the mouse fires off messages to the application, and these 
eventually percolate back down to the display and cause it to update. It's 
important to note that the display need not be a member of the ogcKeypad 
gauge for this to work; the connection between buttons and keypad is handled 
entirely through messages.

To try out the gauge, use the following opengc.ini fragment:

NEWGAUGE
Keypad
10 10 1.0 1.0
ENDGAUGE

None of this code affects the function of existing gauges, however I've 
modified the CMakeLists.txt file so you should re-run CMake prior to 
building.

Cheers,
-Damion-

_________________________________________________________________
Join the world’s largest e-mail service with MSN Hotmail. 
http://www.hotmail.com