src/palmos/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/palmos/dcclient.cpp
   3 // Purpose:     wxClientDC class
   4 // Author:      William Osborne - minimal working wxPalmOS port
   5 // Modified by:
   6 // Created:     10/13/04
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) William Osborne
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ===========================================================================
  13 // declarations
  14 // ===========================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/dcclient.h"
  28 #include "wx/palmos/dcclient.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/string.h"
  32     #include "wx/log.h"
  33     #include "wx/window.h"
  34 #endif
  35
  36 // ----------------------------------------------------------------------------
  37 // array/list types
  38 // ----------------------------------------------------------------------------
  39
  40 struct WXDLLEXPORT wxPaintDCInfo
  41 {
  42     wxPaintDCInfo(wxWindow *win, wxPaintDCImpl *dc)
  43     {
  44         hwnd = win->GetHWND();
  45         hdc = dc->GetHDC();
  46         count = 1;
  47     }
  48
  49     WXHWND    hwnd;       // window for this DC
  50     WXHDC     hdc;        // the DC handle
  51     size_t    count;      // usage count
  52 };
  53
  54 #include "wx/arrimpl.cpp"
  55
  56 WX_DEFINE_OBJARRAY(wxArrayDCInfo)
  57
  58 // ===========================================================================
  59 // implementation
  60 // ===========================================================================
  61
  62 // ----------------------------------------------------------------------------
  63 // wxWindowDCImpl
  64 // ----------------------------------------------------------------------------
  65
  66 IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxPalmDCImpl)
  67
  68 wxWindowDCImpl::wxWindowDCImpl( wxDC *owner ) :
  69    wxPalmDCImpl( owner )
  70 {
  71 }
  72
  73 wxWindowDCImpl::wxWindowDCImpl( wxDC *owner, wxWindow *window ) :
  74    wxPalmDCImpl( owner )
  75 {
  76     wxCHECK_RET( window, wxT("invalid window in wxWindowDCImpl") );
  77 }
  78
  79 void wxWindowDCImpl::InitDC()
  80 {
  81
  82     // since we are a window dc we need to grab the palette from the window
  83 #if wxUSE_PALETTE
  84     InitializePalette();
  85 #endif
  86 }
  87
  88 void wxWindowDCImpl::DoGetSize(int *width, int *height) const
  89 {
  90     wxCHECK_RET( m_window, wxT("wxWindowDCImpl without a window?") );
  91
  92     m_window->GetSize(width, height);
  93 }
  94
  95 // ----------------------------------------------------------------------------
  96 // wxClientDCImpl
  97 // ----------------------------------------------------------------------------
  98
  99 IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl)
 100
 101 wxClientDCImpl::wxClientDCImpl( wxDC *owner ) :
 102    wxWindowDCImpl( owner )
 103 {
 104 }
 105
 106 wxClientDCImpl::wxClientDCImpl( wxDC *owner, wxWindow *window ) :
 107    wxWindowDCImpl( owner )
 108 {
 109 }
 110
 111 void wxClientDCImpl::InitDC()
 112 {
 113     wxWindowDCImpl::InitDC();
 114
 115     // in wxUniv build we must manually do some DC adjustments usually
 116     // performed by Windows for us
 117     //
 118     // we also need to take the menu/toolbar manually into account under
 119     // Windows CE because they're just another control there, not anything
 120     // special as usually under Windows
 121 #if defined(__WXUNIVERSAL__) || defined(__WXWINCE__)
 122     wxPoint ptOrigin = m_window->GetClientAreaOrigin();
 123     if ( ptOrigin.x || ptOrigin.y )
 124     {
 125         // no need to shift DC origin if shift is null
 126         SetDeviceOrigin(ptOrigin.x, ptOrigin.y);
 127     }
 128
 129     // clip the DC to avoid overwriting the non client area
 130     SetClippingRegion(wxPoint(0,0), m_window->GetClientSize());
 131 #endif // __WXUNIVERSAL__ || __WXWINCE__
 132 }
 133
 134 wxClientDCImpl::~wxClientDCImpl()
 135 {
 136 }
 137
 138 void wxClientDCImpl::DoGetSize(int *width, int *height) const
 139 {
 140     wxCHECK_RET( m_window, wxT("wxClientDCImpl without a window?") );
 141
 142     m_window->GetClientSize(width, height);
 143 }
 144
 145 // ----------------------------------------------------------------------------
 146 // wxPaintDCImpl
 147 // ----------------------------------------------------------------------------
 148
 149 // VZ: initial implementation (by JACS) only remembered the last wxPaintDC
 150 //     created and tried to reuse it - this was supposed to take care of a
 151 //     situation when a derived class OnPaint() calls base class OnPaint()
 152 //     because in this case ::BeginPaint() shouldn't be called second time.
 153 //
 154 //     I'm not sure how useful this is, however we must remember the HWND
 155 //     associated with the last HDC as well - otherwise we may (and will!) try
 156 //     to reuse the HDC for another HWND which is a nice recipe for disaster.
 157 //
 158 //     So we store a list of windows for which we already have the DC and not
 159 //     just one single hDC. This seems to work, but I'm really not sure about
 160 //     the usefullness of the whole idea - IMHO it's much better to not call
 161 //     base class OnPaint() at all, or, if we really want to allow it, add a
 162 //     "wxPaintDC *" parameter to wxPaintEvent which should be used if it's
 163 //     !NULL instead of creating a new DC.
 164
 165 IMPLEMENT_ABSTRACT_CLASS(wxPaintDCImpl, wxClientDCImpl)
 166
 167 wxArrayDCInfo wxPaintDCImpl::ms_cache;
 168
 169 wxPaintDCImpl::wxPaintDCImpl( wxDC *owner ) :
 170    wxClientDCImpl( owner )
 171 {
 172 }
 173
 174 wxPaintDCImpl::wxPaintDCImpl( wxDC *owner, wxWindow *window ) :
 175    wxClientDCImpl( owner )
 176 {
 177     wxCHECK_RET( window, wxT("NULL canvas in wxPaintDCImpl ctor") );
 178
 179     m_window = window;
 180
 181     // do we have a DC for this window in the cache?
 182     wxPaintDCInfo *info = FindInCache();
 183     if ( info )
 184     {
 185         m_hDC = info->hdc;
 186         info->count++;
 187     }
 188     else // not in cache, create a new one
 189     {
 190         //m_hDC = (WXHDC)::BeginPaint(GetHwndOf(m_window), &g_paintStruct);
 191         if (m_hDC)
 192             ms_cache.Add(new wxPaintDCInfo(m_window, this));
 193     }
 194
 195     // Note: at this point m_hDC can be NULL under MicroWindows, when dragging.
 196     if (!GetHDC())
 197         return;
 198
 199     // (re)set the DC parameters.
 200     InitDC();
 201
 202     // the HDC can have a clipping box (which we didn't set), make sure our
 203     // DoGetClippingBox() checks for it
 204     m_clipping = true;
 205 }
 206
 207 wxPaintDCImpl::~wxPaintDCImpl()
 208 {
 209     if ( m_hDC )
 210     {
 211         SelectOldObjects(m_hDC);
 212
 213         size_t index;
 214         wxPaintDCInfo *info = FindInCache(&index);
 215
 216         wxCHECK_RET( info, wxT("existing DC should have a cache entry") );
 217
 218         if ( --info->count == 0 )
 219         {
 220             //::EndPaint(GetHwndOf(m_window), &g_paintStruct);
 221
 222             ms_cache.RemoveAt(index);
 223
 224             // Reduce the number of bogus reports of non-freed memory
 225             // at app exit
 226             if (ms_cache.IsEmpty())
 227                 ms_cache.Clear();
 228         }
 229         //else: cached DC entry is still in use
 230
 231         // prevent the base class dtor from ReleaseDC()ing it again
 232         m_hDC = 0;
 233     }
 234 }
 235
 236 wxPaintDCInfo *wxPaintDCImpl::FindInCache(size_t *index) const
 237 {
 238     wxPaintDCInfo *info = NULL;
 239     size_t nCache = ms_cache.GetCount();
 240     for ( size_t n = 0; n < nCache; n++ )
 241     {
 242         wxPaintDCInfo *info1 = &ms_cache[n];
 243         if ( info1->hwnd == m_window->GetHWND() )
 244         {
 245             info = info1;
 246             if ( index )
 247                 *index = n;
 248             break;
 249         }
 250     }
 251
 252     return info;
 253 }
 254
 255 // find the entry for this DC in the cache (keyed by the window)
 256 WXHDC wxPaintDCImpl::FindDCInCache(wxWindow* win)
 257 {
 258     size_t nCache = ms_cache.GetCount();
 259     for ( size_t n = 0; n < nCache; n++ )
 260     {
 261         wxPaintDCInfo *info = &ms_cache[n];
 262         if ( info->hwnd == win->GetHWND() )
 263         {
 264             return info->hdc;
 265         }
 266     }
 267     return 0;
 268 }