1\section{\class{wxModule}}\label{wxmodule}
2
3The module system is a very simple mechanism to allow applications (and parts
4of wxWidgets itself) to define initialization and cleanup functions that are
5automatically called on wxWidgets startup and exit.
6
7To define a new kind of module, derive a class from wxModule, override the
8\helpref{OnInit}{wxmoduleoninit} and \helpref{OnExit}{wxmoduleonexit} 
9functions, and add the DECLARE\_DYNAMIC\_CLASS and IMPLEMENT\_DYNAMIC\_CLASS to
10header and implementation files (which can be the same file). On
11initialization, wxWidgets will find all classes derived from wxModule, create
12an instance of each, and call each OnInit function. On exit, wxWidgets will
13call the OnExit function for each module instance.
14
15Note that your module class does not have to be in a header file.
16
17For example:
18
19\begin{verbatim}
20  // A module to allow DDE initialization/cleanup
21  // without calling these functions from app.cpp or from
22  // the user's application.
23  class wxDDEModule: public wxModule
24  {
25  public:
26      wxDDEModule() { }
27      virtual bool OnInit() { wxDDEInitialize(); return true; };
28      virtual void OnExit() { wxDDECleanUp(); };
29
30  private:
31      DECLARE_DYNAMIC_CLASS(wxDDEModule)
32  };
33
34  IMPLEMENT_DYNAMIC_CLASS(wxDDEModule, wxModule)
35
36
37  // Another module which uses DDE in its OnInit()
38  class MyModule: public wxModule
39  {
40  public:
41      wxDDEModule() { AddDependency(CLASSINFO(wxDDEModule)); }
42      virtual bool OnInit() { ... code using DDE ... }
43      virtual void OnExit() { ... }
44
45  private:
46      DECLARE_DYNAMIC_CLASS(wxDDEModule)
47  };
48\end{verbatim}
49
50\wxheading{Derived from}
51
52\helpref{wxObject}{wxobject}
53
54\wxheading{Include files}
55
56<wx/module.h>
57
58\latexignore{\rtfignore{\wxheading{Members}}}
59
60
61\membersection{wxModule::wxModule}\label{wxmodulector}
62
63\func{}{wxModule}{\void}
64
65Constructs a wxModule object.
66
67
68\membersection{wxModule::\destruct{wxModule}}\label{wxmoduledtor}
69
70\func{}{\destruct{wxModule}}{\void}
71
72Destructor.
73
74
75\membersection{wxModule::AddDependency}\label{wxmoduleadddependency}
76
77\func{void}{AddDependency}{\param{wxClassInfo * }{dep}}
78
79Call this function from the constructor of the derived class. \arg{dep} must be
80the \helpref{CLASSINFO}{classinfo} of a wxModule-derived class and the
81corresponding module will be loaded \emph{before} and unloaded \emph{after}
82this module.
83
84Note that circular dependencies are detected and result in a fatal error.
85
86\wxheading{Parameters}
87
88\docparam{dep}{The class information object for the dependent module.}
89
90
91\membersection{wxModule::OnExit}\label{wxmoduleonexit}
92
93\func{virtual void}{OnExit}{\void}
94
95Provide this function with appropriate cleanup for your module.
96
97
98\membersection{wxModule::OnInit}\label{wxmoduleoninit}
99
100\func{virtual bool}{OnInit}{\void}
101
102Provide this function with appropriate initialization for your module. If the function
103returns false, wxWidgets will exit immediately.
104
105