helper class for implementing composite controls under MSW

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30935 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/subwin.h

@@ -0,0 +1,136 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/subwin.h
+// Purpose:     helper for implementing the controls with subwindows
+// Author:      Vadim Zeitlin
+// Modified by:
+// Created:     2004-12-11
+// RCS-ID:      $Id$
+// Copyright:   (c) 2004 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_SUBWIN_H_
+#define _WX_MSW_SUBWIN_H_
+
+#include "wx/msw/private.h"
+
+// ----------------------------------------------------------------------------
+// wxSubwindows contains all HWNDs making part of a single wx control
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxSubwindows
+{
+public:
+    // the number of subwindows can be specified either as parameter to ctor or
+    // later in Create()
+    wxSubwindows(size_t n = 0) { Init(); if ( n ) Create(n); }
+
+    // allocate enough space for the given number of windows
+    void Create(size_t n)
+    {
+        wxASSERT_MSG( !m_hwnds, _T("Create() called twice?") );
+
+        m_count = n;
+        m_hwnds = (HWND *)calloc(n, sizeof(HWND));
+    }
+
+    // non-virtual dtor, this class is not supposed to be used polymorphically
+    ~wxSubwindows()
+    {
+        for ( size_t n = 0; n < m_count; n++ )
+        {
+            ::DestroyWindow(m_hwnds[n]);
+        }
+
+        free(m_hwnds);
+    }
+
+    // get the number of subwindows
+    size_t GetCount() const { return m_count; }
+
+    // access a given window
+    HWND& Get(size_t n)
+    {
+        wxASSERT_MSG( n < m_count, _T("subwindow index out of range") );
+
+        return m_hwnds[n];
+    }
+
+    HWND& operator[](size_t n) { return Get(n); }
+    HWND operator[](size_t n) const
+    {
+        return wx_const_cast(wxSubwindows *, this)->Get(n);
+    }
+
+    // check if we have this window
+    bool HasWindow(HWND hwnd)
+    {
+        for ( size_t n = 0; n < m_count; n++ )
+        {
+            if ( m_hwnds[n] == hwnd )
+                return true;
+        }
+
+        return false;
+    }
+
+
+    // methods which are forwarded to all subwindows
+    // ---------------------------------------------
+
+    // show/hide everything
+    void Show(bool show)
+    {
+        int sw = show ? SW_SHOW : SW_HIDE;
+        for ( size_t n = 0; n < m_count; n++ )
+        {
+            ::ShowWindow(m_hwnds[n], sw);
+        }
+    }
+
+    // set font for all windows
+    void SetFont(const wxFont& font)
+    {
+        HFONT hfont = GetHfontOf(font);
+        wxCHECK_RET( hfont, _T("invalid font") );
+
+        for ( size_t n = 0; n < m_count; n++ )
+        {
+            ::SendMessage(m_hwnds[n], WM_SETFONT, (WPARAM)hfont, 0);
+        }
+    }
+
+    // find the bounding box for all windows
+    wxRect GetBoundingBox() const
+    {
+        wxRect r;
+        for ( size_t n = 0; n < m_count; n++ )
+        {
+            RECT rc;
+            ::GetWindowRect(m_hwnds[n], &rc);
+
+            r.Union(wxRectFromRECT(rc));
+        }
+
+        return r;
+    }
+
+private:
+    void Init()
+    {
+        m_count = 0;
+        m_hwnds = NULL;
+    }
+
+    // number of elements in m_hwnds array
+    size_t m_count;
+
+    // the HWNDs we contain
+    HWND *m_hwnds;
+
+
+    DECLARE_NO_COPY_CLASS(wxSubwindows)
+};
+
+#endif // _WX_MSW_SUBWIN_H_
+