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[wxWidgets.git] / include / wx / module.h

diff --git a/include/wx/module.h b/include/wx/module.h
index aaa9354269c1ad6d214709c836ddb5a08811ff57..a35aab0e5e8418eb2ee041cd7c5db3e8356e9727 100644 (file)
--- a/include/wx/module.h
+++ b/include/wx/module.h
@@ -9,41 +9,96 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifndef __MODULEH__
-#define __MODULEH__
-
-#ifdef __GNUG__
-#pragma interface "module.h"
-#endif
+#ifndef _WX_MODULE_H_
+#define _WX_MODULE_H_
 
 #include "wx/object.h"
 #include "wx/list.h"
-#include "wx/setup.h"
+#include "wx/dynarray.h"
+
+// declare a linked list of modules
+class WXDLLIMPEXP_BASE wxModule;
+WX_DECLARE_USER_EXPORTED_LIST(wxModule, wxModuleList, WXDLLIMPEXP_BASE);
+
+// and an array of class info objects
+WX_DEFINE_USER_EXPORTED_ARRAY_PTR(wxClassInfo *, wxArrayClassInfo,
+                                    class WXDLLIMPEXP_BASE);
 
-class WXDLLEXPORT wxModule: public wxObject
+
+// declaring a class derived from wxModule will automatically create an
+// instance of this class on program startup, call its OnInit() method and call
+// OnExit() on program termination (but only if OnInit() succeeded)
+class WXDLLIMPEXP_BASE wxModule : public wxObject
 {
 public:
-    wxModule(void) {}
-    ~wxModule(void) {}
+    wxModule() {}
+    virtual ~wxModule() {}
+
+    // if module init routine returns false the application
+    // will fail to startup
 
-    // If returns FALSE, quits the application immediately.
-    bool Init(void) { return OnInit(); }
-    void Exit(void) { OnExit(); }
+    bool Init() { return OnInit(); }
+    void Exit() { OnExit(); }
 
     // Override both of these
-    virtual bool OnInit(void) = 0;
-    virtual void OnExit(void) = 0;
 
-    static void RegisterModule(wxModule* module);
-    static bool RegisterModules(void);
-    static bool InitializeModules(void);
-    static void CleanUpModules(void);
+        // called on program startup
+
+    virtual bool OnInit() = 0;
+
+        // called just before program termination, but only if OnInit()
+        // succeeded
+
+    virtual void OnExit() = 0;
+
+    static void RegisterModule(wxModule *module);
+    static void RegisterModules();
+    static bool InitializeModules();
+    static void CleanUpModules() { DoCleanUpModules(m_modules); }
+
+    // used by wxObjectLoader when unloading shared libs's
+
+    static void UnregisterModule(wxModule *module);
 
 protected:
-    static wxList   m_modules;
+    static wxModuleList m_modules;
+
+    // the function to call from constructor of a deriving class add module
+    // dependency which will be initialized before the module and unloaded
+    // after that
+    void AddDependency(wxClassInfo *dep)
+    {
+        wxCHECK_RET( dep, _T("NULL module dependency") );
+
+        m_dependencies.Add(dep);
+    }
+
+private:
+    // initialize module and Append it to initializedModules list recursively
+    // calling itself to satisfy module dependencies if needed
+    static bool
+    DoInitializeModule(wxModule *module, wxModuleList &initializedModules);
+
+    // cleanup the modules in the specified list (which may not contain all
+    // modules if we're called during initialization because not all modules
+    // could be initialized) and also empty m_modules itself
+    static void DoCleanUpModules(const wxModuleList& modules);
+
+
+    // module dependencies: contains 
+    wxArrayClassInfo m_dependencies;
+
+    // used internally while initiliazing/cleaning up modules
+    enum
+    {
+        State_Registered,   // module registered but not initialized yet
+        State_Initializing, // we're initializing this module but not done yet
+        State_Initialized   // module initialized successfully
+    } m_state;
+
 
-DECLARE_CLASS(wxModule)
+    DECLARE_CLASS(wxModule)
 };
 
-#endif
+#endif // _WX_MODULE_H_