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[wxWidgets.git] / docs / tech / tn0024.txt

                         How to add a new XRC handler\r
                         ============================\r
\r
0. Purpose\r
----------\r
\r
This note describes what needs to be done to add a new XRC handler, i.e. add\r
support for loading the objects of some class wxFoo from XRC.\r
\r
\r
1. Implement the handler\r
------------------------\r
\r
By convention, the XRC handler for a class wxFoo declared in wx/foo.h is called\r
wxFooXmlHandler and is declared in the file wx/xrc/xh_foo.h (this last rule\r
wasn't always respected in the past, however it's not a reason to not respect\r
it in the future). The steps for adding a new handler are:\r
\r
a) Add handler declaration in include/wx/xrc/xh_foo.h, it will usually be the\r
   same as in the other files so you can get inspiration for your brand new\r
   handler from e.g. wx/xrc/xh_srchctrl.h. Notice the use of wxUSE_FOO if wxFoo\r
   is guarded by this symbol.\r
\r
b) Add implementation in src/xrc/xh_foo.cpp: again, it will be almost always\r
   very similar to the existing controls. You will need to add support for\r
   the control-specific styles.\r
\r
\r
2. Update the other files\r
-------------------------\r
\r
There are a few other files to update to make wxWidgets aware of the new\r
handler:\r
\r
a) Add the new files created above to build/bakefiles/files.bkl: search for\r
   "xh_srchctrl" to see where you need to add them\r
\r
b) Add #include "wx/xrc/xh_foo.h" to wx/xrc/xh_all.h.\r
\r
c) Register the new handler in wxXmlResource::InitAllHandlers() in\r
   src/xrc/xmlrsall.cpp\r
\r
\r
3. Update the sample\r
--------------------\r
\r
Demonstrate that the new handler works by adding a control using it to\r
samples/xrc/rc/controls.xrc.\r
\r
\r
=== EOF ===\r
\r
Author:  VZ\r
Version: $Id: tn0021.txt 47865 2007-08-03 20:00:32Z VZ $\r
\r