added possibility to specify modules dependencies

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39677 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/module.h

@@ -14,11 +14,17 @@
 
 #include "wx/object.h"
 #include "wx/list.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);
+
+
 // 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)
@@ -48,7 +54,7 @@ public:
     static void RegisterModule(wxModule *module);
     static void RegisterModules();
     static bool InitializeModules();
-    static void CleanUpModules();
+    static void CleanUpModules() { DoCleanUpModules(m_modules); }
 
     // used by wxObjectLoader when unloading shared libs's
 
@@ -57,6 +63,40 @@ public:
 protected:
     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)
 };