src/common/rendcmn.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/rendcmn.cpp
   3 // Purpose:     wxRendererNative common functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     28.07.03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // License:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/app.h"
  28 #endif //WX_PRECOMP
  29
  30 #include "wx/apptrait.h"
  31 #include "wx/renderer.h"
  32
  33 #include "wx/ptr_scpd.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // wxRendererPtr: auto pointer holding the global renderer
  37 // ----------------------------------------------------------------------------
  38
  39 wxDECLARE_SCOPED_PTR(wxRendererNative, wxRendererPtrBase);
  40 wxDEFINE_SCOPED_PTR(wxRendererNative, wxRendererPtrBase);
  41
  42 class wxRendererPtr : public wxRendererPtrBase
  43 {
  44 public:
  45     wxRendererPtr() : wxRendererPtrBase(NULL) { m_initialized = false; }
  46
  47     // return true if we have a renderer, false otherwise
  48     bool IsOk()
  49     {
  50         if ( !m_initialized )
  51         {
  52             // only try to create the renderer once
  53             m_initialized = true;
  54
  55             DoInit();
  56         }
  57
  58         return get() != NULL;
  59     }
  60
  61 private:
  62     void DoInit()
  63     {
  64         wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
  65         if ( traits )
  66         {
  67             // ask the traits object to create a renderer for us
  68             reset(traits->CreateRenderer());
  69         }
  70     }
  71
  72     bool m_initialized;
  73
  74     DECLARE_NO_COPY_CLASS(wxRendererPtr)
  75 };
  76
  77 // ============================================================================
  78 // wxRendererNative implementation
  79 // ============================================================================
  80
  81 /* static */
  82 wxRendererNative& wxRendererNative::Get()
  83 {
  84     static wxRendererPtr s_renderer;
  85
  86     return s_renderer.IsOk() ? *s_renderer.get() : GetDefault();
  87 }
  88