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