projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| b0f73b67 VZ |
1 | How to add a new XRC handler |
| 2 | ============================ | |
| 3 | ||
| 4 | 0. Purpose | |
| 5 | ---------- | |
| 6 | ||
| 7 | This note describes what needs to be done to add a new XRC handler, i.e. add | |
| 8 | support for loading the objects of some class wxFoo from XRC. | |
| 9 | ||
| 10 | ||
| 11 | 1. Implement the handler | |
| 12 | ------------------------ | |
| 13 | ||
| 14 | By convention, the XRC handler for a class wxFoo declared in wx/foo.h is called | |
| 15 | wxFooXmlHandler and is declared in the file wx/xrc/xh_foo.h (this last rule | |
| 16 | wasn't always respected in the past, however it's not a reason to not respect | |
| 17 | it in the future). The steps for adding a new handler are: | |
| 18 | ||
| 19 | a) Add handler declaration in include/wx/xrc/xh_foo.h, it will usually be the | |
| 20 | same as in the other files so you can get inspiration for your brand new | |
| 21 | handler from e.g. wx/xrc/xh_srchctrl.h. Notice the use of wxUSE_FOO if wxFoo | |
| 22 | is guarded by this symbol. | |
| 23 | ||
| 24 | b) Add implementation in src/xrc/xh_foo.cpp: again, it will be almost always | |
| 25 | very similar to the existing controls. You will need to add support for | |
| 26 | the control-specific styles. | |
| 27 | ||
| 28 | ||
| 29 | 2. Update the other files | |
| 30 | ------------------------- | |
| 31 | ||
| 32 | There are a few other files to update to make wxWidgets aware of the new | |
| 33 | handler: | |
| 34 | ||
| 35 | a) Add the new files created above to build/bakefiles/files.bkl: search for | |
| 36 | "xh_srchctrl" to see where you need to add them | |
| 37 | ||
| 38 | b) Add #include "wx/xrc/xh_foo.h" to wx/xrc/xh_all.h. | |
| 39 | ||
| 40 | c) Register the new handler in wxXmlResource::InitAllHandlers() in | |
| 41 | src/xrc/xmlrsall.cpp | |
| 42 | ||
| 43 | ||
| 44 | 3. Update the sample | |
| 45 | -------------------- | |
| 46 | ||
| 47 | Demonstrate that the new handler works by adding a control using it to | |
| 48 | samples/xrc/rc/controls.xrc. | |
| 49 | ||
| 50 | ||
| 51 | === EOF === | |
| 52 | ||
| 53 | Author: VZ | |
| 54 | Version: $Id: tn0021.txt 47865 2007-08-03 20:00:32Z VZ $ | |
| 55 |