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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #if wxUSE_IMAGE
  36 #include "wx/image.h"
  37 #endif
  38
  39 // ===========================================================================
  40 // implementation
  41 // ===========================================================================
  42
  43 #include "wx/listimpl.cpp"
  44 WX_DECLARE_LIST(wxArtProvider, wxArtProvidersList);
  45 WX_DEFINE_LIST(wxArtProvidersList);
  46
  47 // ----------------------------------------------------------------------------
  48 // Cache class - stores already requested bitmaps
  49 // ----------------------------------------------------------------------------
  50
  51 WX_DECLARE_EXPORTED_STRING_HASH_MAP(wxBitmap, wxArtProviderBitmapsHash);
  52
  53 class WXDLLEXPORT wxArtProviderCache
  54 {
  55 public:
  56     bool GetBitmap(const wxString& full_id, wxBitmap* bmp);
  57     void PutBitmap(const wxString& full_id, const wxBitmap& bmp)
  58         { m_bitmapsHash[full_id] = bmp; }
  59
  60     void Clear();
  61
  62     static wxString ConstructHashID(const wxArtID& id,
  63                                     const wxArtClient& client,
  64                                     const wxSize& size);
  65
  66 private:
  67     wxArtProviderBitmapsHash m_bitmapsHash;
  68 };
  69
  70 bool wxArtProviderCache::GetBitmap(const wxString& full_id, wxBitmap* bmp)
  71 {
  72     wxArtProviderBitmapsHash::iterator entry = m_bitmapsHash.find(full_id);
  73     if ( entry == m_bitmapsHash.end() )
  74     {
  75         return FALSE;
  76     }
  77     else
  78     {
  79         *bmp = entry->second;
  80         return TRUE;
  81     }
  82 }
  83
  84 void wxArtProviderCache::Clear()
  85 {
  86     m_bitmapsHash.clear();
  87 }
  88
  89 /*static*/ wxString wxArtProviderCache::ConstructHashID(
  90                                 const wxArtID& id, const wxArtClient& client,
  91                                 const wxSize& size)
  92 {
  93     wxString str;
  94     str.Printf(wxT("%s-%s-%i-%i"), id.c_str(), client.c_str(), size.x, size.y);
  95     return str;
  96 }
  97
  98
  99 // ----------------------------------------------------------------------------
 100 // wxArtProvider class
 101 // ----------------------------------------------------------------------------
 102
 103 IMPLEMENT_ABSTRACT_CLASS(wxArtProvider, wxObject)
 104
 105 wxArtProvidersList *wxArtProvider::sm_providers = NULL;
 106 wxArtProviderCache *wxArtProvider::sm_cache = NULL;
 107
 108 /*static*/ void wxArtProvider::PushProvider(wxArtProvider *provider)
 109 {
 110     if ( !sm_providers )
 111     {
 112         sm_providers = new wxArtProvidersList;
 113         sm_cache = new wxArtProviderCache;
 114     }
 115
 116     sm_providers->Insert(provider);
 117     sm_cache->Clear();
 118 }
 119
 120 /*static*/ bool wxArtProvider::PopProvider()
 121 {
 122     wxCHECK_MSG( sm_providers, FALSE, _T("no wxArtProvider exists") );
 123     wxCHECK_MSG( sm_providers->GetCount() > 0, FALSE, _T("wxArtProviders stack is empty") );
 124
 125     delete sm_providers->GetFirst()->GetData();
 126     sm_providers->Erase(sm_providers->GetFirst());
 127     sm_cache->Clear();
 128     return TRUE;
 129 }
 130
 131 /*static*/ bool wxArtProvider::RemoveProvider(wxArtProvider *provider)
 132 {
 133     wxCHECK_MSG( sm_providers, FALSE, _T("no wxArtProvider exists") );
 134
 135     if ( sm_providers->DeleteObject(provider) )
 136     {
 137         delete provider;
 138         sm_cache->Clear();
 139         return TRUE;
 140     }
 141
 142     return FALSE;
 143 }
 144
 145 /*static*/ void wxArtProvider::CleanUpProviders()
 146 {
 147     WX_CLEAR_LIST(wxArtProvidersList, *sm_providers);
 148     wxDELETE(sm_providers);
 149     wxDELETE(sm_cache);
 150 }
 151
 152 /*static*/ wxBitmap wxArtProvider::GetBitmap(const wxArtID& id,
 153                                              const wxArtClient& client,
 154                                              const wxSize& size)
 155 {
 156     // safety-check against writing client,id,size instead of id,client,size:
 157     wxASSERT_MSG( client.Last() == _T('C'), _T("invalid 'client' parameter") );
 158
 159     wxCHECK_MSG( sm_providers, wxNullBitmap, _T("no wxArtProvider exists") );
 160
 161     wxString hashId = wxArtProviderCache::ConstructHashID(id, client, size);
 162
 163     wxBitmap bmp;
 164     if ( !sm_cache->GetBitmap(hashId, &bmp) )
 165     {
 166         for (wxArtProvidersList::compatibility_iterator node = sm_providers->GetFirst();
 167              node; node = node->GetNext())
 168         {
 169             bmp = node->GetData()->CreateBitmap(id, client, size);
 170             if ( bmp.Ok() )
 171             {
 172 #if wxUSE_IMAGE
 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 #endif
 181                 break;
 182             }
 183         }
 184
 185         sm_cache->PutBitmap(hashId, bmp);
 186     }
 187
 188     return bmp;
 189 }
 190
 191 /*static*/ wxIcon wxArtProvider::GetIcon(const wxArtID& id,
 192                                          const wxArtClient& client,
 193                                          const wxSize& size)
 194 {
 195     wxCHECK_MSG( sm_providers, wxNullIcon, _T("no wxArtProvider exists") );
 196
 197     wxBitmap bmp = GetBitmap(id, client, size);
 198     if ( !bmp.Ok() )
 199         return wxNullIcon;
 200
 201     wxIcon icon;
 202     icon.CopyFromBitmap(bmp);
 203     return icon;
 204 }
 205
 206
 207 class wxArtProviderModule: public wxModule
 208 {
 209 public:
 210     bool OnInit()
 211     {
 212         wxArtProvider::InitStdProvider();
 213         return TRUE;
 214     }
 215     void OnExit()
 216     {
 217         wxArtProvider::CleanUpProviders();
 218     }
 219
 220     DECLARE_DYNAMIC_CLASS(wxArtProviderModule)
 221 };
 222
 223 IMPLEMENT_DYNAMIC_CLASS(wxArtProviderModule, wxModule)