update from Michalis Kabrianis (patch 1145218)

[wxWidgets.git] / include / wx / msw / private.h

diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 503f119bed65bb11038eb6f4b1faf295a93a2955..ff47704cfa483db90dc17881120aac9c76aa0e77 100644 (file)
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -44,16 +44,22 @@ class WXDLLEXPORT wxWindow;
 
 #if wxUSE_GUI
 
-WXDLLEXPORT_DATA(extern HICON) wxSTD_FRAME_ICON;
-WXDLLEXPORT_DATA(extern HICON) wxSTD_MDIPARENTFRAME_ICON;
-WXDLLEXPORT_DATA(extern HICON) wxSTD_MDICHILDFRAME_ICON;
-WXDLLEXPORT_DATA(extern HICON) wxDEFAULT_FRAME_ICON;
-WXDLLEXPORT_DATA(extern HICON) wxDEFAULT_MDIPARENTFRAME_ICON;
-WXDLLEXPORT_DATA(extern HICON) wxDEFAULT_MDICHILDFRAME_ICON;
-WXDLLEXPORT_DATA(extern HFONT) wxSTATUS_LINE_FONT;
+extern WXDLLEXPORT_DATA(HICON) wxSTD_FRAME_ICON;
+extern WXDLLEXPORT_DATA(HICON) wxSTD_MDIPARENTFRAME_ICON;
+extern WXDLLEXPORT_DATA(HICON) wxSTD_MDICHILDFRAME_ICON;
+extern WXDLLEXPORT_DATA(HICON) wxDEFAULT_FRAME_ICON;
+extern WXDLLEXPORT_DATA(HICON) wxDEFAULT_MDIPARENTFRAME_ICON;
+extern WXDLLEXPORT_DATA(HICON) wxDEFAULT_MDICHILDFRAME_ICON;
+extern WXDLLEXPORT_DATA(HFONT) wxSTATUS_LINE_FONT;
 
 #endif // wxUSE_GUI
 
+// ---------------------------------------------------------------------------
+// global data
+// ---------------------------------------------------------------------------
+
+extern WXDLLIMPEXP_DATA_BASE(HINSTANCE) wxhInstance;
+
 // ---------------------------------------------------------------------------
 // define things missing from some compilers' headers
 // ---------------------------------------------------------------------------
@@ -451,6 +457,64 @@ private:
     DECLARE_NO_COPY_CLASS(GlobalPtr)
 };
 
+// register the class when it is first needed and unregister it in dtor
+class ClassRegistrar
+{
+public:
+    // ctor doesn't register the class, call Initialize() for this
+    ClassRegistrar() { m_registered = -1; }
+
+    // return true if the class is already registered
+    bool IsInitialized() const { return m_registered != -1; }
+
+    // return true if the class had been already registered
+    bool IsRegistered() const { return m_registered == 1; }
+
+    // try to register the class if not done yet, return true on success
+    bool Register(const WNDCLASS& wc)
+    {
+        // we should only be called if we hadn't been initialized yet
+        wxASSERT_MSG( m_registered == -1,
+                        _T("calling ClassRegistrar::Register() twice?") );
+
+        m_registered = ::RegisterClass(&wc) ? 1 : 0;
+        if ( !IsRegistered() )
+        {
+            wxLogLastError(_T("RegisterClassEx()"));
+        }
+        else
+        {
+            m_clsname = wc.lpszClassName;
+        }
+
+        return m_registered == 1;
+    }
+
+    // get the name of the registered class (returns empty string if not
+    // registered)
+    const wxString& GetName() const { return m_clsname; }
+
+    // unregister the class if it had been registered
+    ~ClassRegistrar()
+    {
+        if ( IsRegistered() )
+        {
+            if ( !::UnregisterClass(m_clsname, wxhInstance) )
+            {
+                wxLogLastError(_T("UnregisterClass"));
+            }
+        }
+    }
+
+private:
+    // initial value is -1 which means that we hadn't tried registering the
+    // class yet, it becomes true or false (1 or 0) when Initialize() is called
+    int m_registered;
+
+    // the name of the class, only non empty if it had been registered
+    wxString m_clsname;
+};
+
 // ---------------------------------------------------------------------------
 // macros to make casting between WXFOO and FOO a bit easier: the GetFoo()
 // returns Foo cast to the Windows type for oruselves, while GetFooOf() takes
@@ -498,12 +562,6 @@ private:
 
 #endif // wxUSE_GUI
 
-// ---------------------------------------------------------------------------
-// global data
-// ---------------------------------------------------------------------------
-
-WXDLLIMPEXP_DATA_BASE(extern HINSTANCE) wxhInstance;
-
 // ---------------------------------------------------------------------------
 // global functions
 // ---------------------------------------------------------------------------
@@ -553,21 +611,21 @@ WXDLLEXPORT void wxSliderEvent(WXHWND control, WXWORD wParam, WXWORD pos);
 WXDLLEXPORT void wxScrollBarEvent(WXHWND hbar, WXWORD wParam, WXWORD pos);
 
 // Find maximum size of window/rectangle
-WXDLLEXPORT extern void wxFindMaxSize(WXHWND hwnd, RECT *rect);
+extern WXDLLEXPORT void wxFindMaxSize(WXHWND hwnd, RECT *rect);
 
 // Safely get the window text (i.e. without using fixed size buffer)
-WXDLLEXPORT extern wxString wxGetWindowText(WXHWND hWnd);
+extern WXDLLEXPORT wxString wxGetWindowText(WXHWND hWnd);
 
 // get the window class name
-WXDLLEXPORT extern wxString wxGetWindowClass(WXHWND hWnd);
+extern WXDLLEXPORT wxString wxGetWindowClass(WXHWND hWnd);
 
 // get the window id (should be unsigned, hence this is not wxWindowID which
 // is, for mainly historical reasons, signed)
-WXDLLEXPORT extern WXWORD wxGetWindowId(WXHWND hWnd);
+extern WXDLLEXPORT WXWORD wxGetWindowId(WXHWND hWnd);
 
 // check if hWnd's WNDPROC is wndProc. Return true if yes, false if they are
 // different
-WXDLLEXPORT extern bool wxCheckWindowWndProc(WXHWND hWnd, WXFARPROC wndProc);
+extern WXDLLEXPORT bool wxCheckWindowWndProc(WXHWND hWnd, WXFARPROC wndProc);
 
 // Does this window style specify any border?
 inline bool wxStyleHasBorder(long style)
@@ -582,17 +640,17 @@ inline bool wxStyleHasBorder(long style)
 
 // this function simply checks whether the given hWnd corresponds to a wxWindow
 // and returns either that window if it does or NULL otherwise
-WXDLLEXPORT extern wxWindow* wxFindWinFromHandle(WXHWND hWnd);
+extern WXDLLEXPORT wxWindow* wxFindWinFromHandle(WXHWND hWnd);
 
 // find the window for HWND which is part of some wxWindow, i.e. unlike
 // wxFindWinFromHandle() above it will also work for "sub controls" of a
 // wxWindow.
 //
 // returns the wxWindow corresponding to the given HWND or NULL.
-WXDLLEXPORT extern wxWindow *wxGetWindowFromHWND(WXHWND hwnd);
+extern WXDLLEXPORT wxWindow *wxGetWindowFromHWND(WXHWND hwnd);
 
 // Get the size of an icon
-WXDLLEXPORT extern wxSize wxGetHiconSize(HICON hicon);
+extern WXDLLEXPORT wxSize wxGetHiconSize(HICON hicon);
 
 // Lines are drawn differently for WinCE and regular WIN32
 WXDLLEXPORT void wxDrawLine(HDC hdc, int x1, int y1, int x2, int y2);