src/common/artprov.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        artprov.cpp
   3 // Purpose:     wxArtProvider class
   4 // Author:      Vaclav Slavik
   5 // Modified by:
   6 // Created:     18/03/2002
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vaclav Slavik
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ---------------------------------------------------------------------------
  13 // headers
  14 // ---------------------------------------------------------------------------
  15
  16 #ifdef __GNUG__
  17     #pragma implementation "artprov.h"
  18 #endif
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #if defined(__BORLANDC__)
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/log.h"
  29     #include "wx/list.h"
  30 #endif
  31
  32 #include "wx/artprov.h"
  33 #include "wx/hashmap.h"
  34 #include "wx/module.h"
  35 #include "wx/image.h"
  36
  37 // For the purposes of forcing this module to link
  38 extern char g_ArtProviderModule;
  39
  40 // ===========================================================================
  41 // implementation
  42 // ===========================================================================
  43
  44 #include "wx/listimpl.cpp"
  45 WX_DECLARE_LIST(wxArtProvider, wxArtProvidersList);
  46 WX_DEFINE_LIST(wxArtProvidersList);
  47
  48 // ----------------------------------------------------------------------------
  49 // Cache class - stores already requested bitmaps
  50 // ----------------------------------------------------------------------------
  51
  52 WX_DECLARE_EXPORTED_STRING_HASH_MAP(wxBitmap, wxArtProviderBitmapsHash);
  53
  54 class WXDLLEXPORT wxArtProviderCache
  55 {
  56 public:
  57     bool GetBitmap(const wxString& full_id, wxBitmap* bmp);
  58     void PutBitmap(const wxString& full_id, const wxBitmap& bmp)
  59         { m_bitmapsHash[full_id] = bmp; }
  60
  61     void Clear();
  62
  63     static wxString ConstructHashID(const wxArtID& id,
  64                                     const wxArtClient& client,
  65                                     const wxSize& size);
  66
  67 private:
  68     wxArtProviderBitmapsHash m_bitmapsHash;
  69 };
  70
  71 bool wxArtProviderCache::GetBitmap(const wxString& full_id, wxBitmap* bmp)
  72 {
  73     wxArtProviderBitmapsHash::iterator entry = m_bitmapsHash.find(full_id);
  74     if ( entry == m_bitmapsHash.end() )
  75     {
  76         return FALSE;
  77     }
  78     else
  79     {
  80         *bmp = entry->second;
  81         return TRUE;
  82     }
  83 }
  84
  85 void wxArtProviderCache::Clear()
  86 {
  87     // Hack to make the default provider link
  88     // with the application
  89     g_ArtProviderModule = 0;
  90     m_bitmapsHash.clear();
  91 }
  92
  93 /*static*/ wxString wxArtProviderCache::ConstructHashID(
  94                                 const wxArtID& id, const wxArtClient& client,
  95                                 const wxSize& size)
  96 {
  97     wxString str;
  98     str.Printf(wxT("%s-%s-%i-%i"), id.c_str(), client.c_str(), size.x, size.y);
  99     return str;
 100 }
 101
 102
 103 // ----------------------------------------------------------------------------
 104 // wxArtProvider class
 105 // ----------------------------------------------------------------------------
 106
 107 IMPLEMENT_ABSTRACT_CLASS(wxArtProvider, wxObject)
 108
 109 wxArtProvidersList *wxArtProvider::sm_providers = NULL;
 110 wxArtProviderCache *wxArtProvider::sm_cache = NULL;
 111
 112 /*static*/ void wxArtProvider::PushProvider(wxArtProvider *provider)
 113 {
 114     if ( !sm_providers )
 115     {
 116         sm_providers = new wxArtProvidersList;
 117         sm_providers->DeleteContents(TRUE);
 118         sm_cache = new wxArtProviderCache;
 119     }
 120
 121     sm_providers->Insert(provider);
 122 }
 123
 124 /*static*/ bool wxArtProvider::PopProvider()
 125 {
 126     wxCHECK_MSG( sm_providers, FALSE, _T("no wxArtProvider exists") );
 127     wxCHECK_MSG( sm_providers->GetCount() > 0, FALSE, _T("wxArtProviders stack is empty") );
 128
 129     sm_providers->DeleteNode(sm_providers->GetFirst());
 130     sm_cache->Clear();
 131     return TRUE;
 132 }
 133
 134 /*static*/ bool wxArtProvider::RemoveProvider(wxArtProvider *provider)
 135 {
 136     wxCHECK_MSG( sm_providers, FALSE, _T("no wxArtProvider exists") );
 137
 138     if ( sm_providers->DeleteObject(provider) )
 139     {
 140         sm_cache->Clear();
 141         return TRUE;
 142     }
 143
 144     return FALSE;
 145 }
 146
 147 /*static*/ void wxArtProvider::CleanUpProviders()
 148 {
 149     wxDELETE(sm_providers);
 150     wxDELETE(sm_cache);
 151 }
 152
 153 /*static*/ wxBitmap wxArtProvider::GetBitmap(const wxArtID& id,
 154                                              const wxArtClient& client,
 155                                              const wxSize& size)
 156 {
 157     // safety-check against writing client,id,size instead of id,client,size:
 158     wxASSERT_MSG( client.Last() == _T('C'), _T("invalid 'client' parameter") );
 159
 160     wxCHECK_MSG( sm_providers, wxNullBitmap, _T("no wxArtProvider exists") );
 161
 162     wxString hashId = wxArtProviderCache::ConstructHashID(id, client, size);
 163
 164     wxBitmap bmp;
 165     if ( !sm_cache->GetBitmap(hashId, &bmp) )
 166     {
 167         for (wxArtProvidersList::Node *node = sm_providers->GetFirst();
 168              node; node = node->GetNext())
 169         {
 170             bmp = node->GetData()->CreateBitmap(id, client, size);
 171             if ( bmp.Ok() )
 172             {
 173                 if ( size != wxDefaultSize &&
 174                      (bmp.GetWidth() != size.x || bmp.GetHeight() != size.y) )
 175                 {
 176                     wxImage img = bmp.ConvertToImage();
 177                     img.Rescale(size.x, size.y);
 178                     bmp = wxBitmap(img);
 179                 }
 180                 break;
 181             }
 182         }
 183
 184         sm_cache->PutBitmap(hashId, bmp);
 185     }
 186
 187     return bmp;
 188 }
 189
 190 /*static*/ wxIcon wxArtProvider::GetIcon(const wxArtID& id,
 191                                          const wxArtClient& client,
 192                                          const wxSize& size)
 193 {
 194     wxCHECK_MSG( sm_providers, wxNullIcon, _T("no wxArtProvider exists") );
 195
 196     wxBitmap bmp = GetBitmap(id, client, size);
 197     if ( !bmp.Ok() )
 198         return wxNullIcon;
 199
 200     wxIcon icon;
 201     icon.CopyFromBitmap(bmp);
 202     return icon;
 203 }
 204
 205
 206 class wxArtProviderModule: public wxModule
 207 {
 208 public:
 209     bool OnInit() { return TRUE; }
 210     void OnExit() { wxArtProvider::CleanUpProviders(); }
 211
 212     DECLARE_DYNAMIC_CLASS(wxArtProviderModule)
 213 };
 214
 215 IMPLEMENT_DYNAMIC_CLASS(wxArtProviderModule, wxModule)