X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1816a07003767dae4f60b9a5331a26e9ea0258e8..4aaef122cbbd5bbe0e70b824e320458e2329dd13:/include/wx/msw/private.h

diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 25d0b5d786..e61c66cc7c 100644
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -291,14 +291,47 @@ inline RECT wxGetClientRect(HWND hwnd)
 class ScreenHDC
 {
 public:
-    ScreenHDC() { m_hdc = GetDC(NULL);    }
-   ~ScreenHDC() { ReleaseDC(NULL, m_hdc); }
-    operator HDC() const { return m_hdc;  }
+    ScreenHDC() { m_hdc = ::GetDC(NULL);    }
+   ~ScreenHDC() { ::ReleaseDC(NULL, m_hdc); }
+
+    operator HDC() const { return m_hdc; }
+
+private:
+    HDC m_hdc;
+};
+
+// the same as ScreenHDC but for memory DCs: creates the HDC in ctor and
+// destroys it in dtor
+class MemoryHDC
+{
+public:
+    MemoryHDC() { m_hdc = ::CreateCompatibleDC(NULL); }
+   ~MemoryHDC() { ::DeleteObject(m_hdc);              }
+
+    operator HDC() const { return m_hdc; }
 
 private:
     HDC m_hdc;
 };
 
+// a class which selects a GDI object into a DC in its ctor and deselects in
+// dtor
+class SelectInHDC
+{
+public:
+    SelectInHDC(HDC hdc, HGDIOBJ hgdiobj) : m_hdc(hdc)
+        { m_hgdiobj = ::SelectObject(hdc, hgdiobj); }
+
+   ~SelectInHDC() { ::SelectObject(m_hdc, m_hgdiobj); }
+
+   // return true if the object was successfully selected
+   operator bool() const { return m_hgdiobj != 0; }
+
+private:
+   HDC m_hdc;
+   HGDIOBJ m_hgdiobj;
+};
+
 // ---------------------------------------------------------------------------
 // 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
@@ -391,6 +424,9 @@ WXDLLEXPORT extern wxString wxGetWindowClass(WXHWND hWnd);
 // is, for mainly historical reasons, signed)
 WXDLLEXPORT extern WXWORD wxGetWindowId(WXHWND hWnd);
 
+// check if hWnd's WNDPROC is wndProc. Return true if yes, false if they are different
+extern bool wxCheckWindowWndProc(WXHWND hWnd, WXFARPROC wndProc);
+
 // Does this window style specify any border?
 inline bool wxStyleHasBorder(long style)
 {