src/msw/statbmp.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/statbmp.cpp
   3 // Purpose:     wxStaticBitmap
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   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 #if wxUSE_STATBMP
  28
  29 #include "wx/statbmp.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/app.h"
  33     #include "wx/window.h"
  34     #include "wx/icon.h"
  35     #include "wx/dcclient.h"
  36 #endif
  37
  38 #include "wx/msw/private.h"
  39
  40 #include "wx/sysopt.h"
  41
  42 #include <stdio.h>
  43
  44 // ---------------------------------------------------------------------------
  45 // macors
  46 // ---------------------------------------------------------------------------
  47
  48 // ===========================================================================
  49 // implementation
  50 // ===========================================================================
  51
  52 // ---------------------------------------------------------------------------
  53 // wxStaticBitmap
  54 // ---------------------------------------------------------------------------
  55
  56 // we may have either bitmap or icon: if a bitmap with mask is passed, we
  57 // will transform it to an icon ourselves because otherwise the mask will
  58 // be ignored by Windows
  59 // note that this function will create a new object every time
  60 // it is called even if the image needs no conversion
  61
  62 static wxGDIImage* ConvertImage( const wxGDIImage& bitmap )
  63 {
  64     bool isIcon = bitmap.IsKindOf( CLASSINFO(wxIcon) );
  65
  66     if( !isIcon )
  67     {
  68         wxASSERT_MSG( wxDynamicCast(&bitmap, wxBitmap),
  69                       wxT("not an icon and not a bitmap?") );
  70
  71         const wxBitmap& bmp = (const wxBitmap&)bitmap;
  72         wxMask *mask = bmp.GetMask();
  73         if ( mask && mask->GetMaskBitmap() )
  74         {
  75             wxIcon* icon = new wxIcon;
  76             icon->CopyFromBitmap(bmp);
  77
  78             return icon;
  79         }
  80
  81         return new wxBitmap( bmp );
  82     }
  83
  84     // copying a bitmap is a cheap operation
  85     return new wxIcon( (const wxIcon&)bitmap );
  86 }
  87
  88 bool wxStaticBitmap::Create(wxWindow *parent,
  89                             wxWindowID id,
  90                             const wxGDIImage& bitmap,
  91                             const wxPoint& pos,
  92                             const wxSize& size,
  93                             long style,
  94                             const wxString& name)
  95 {
  96     if ( !CreateControl(parent, id, pos, size, style, wxDefaultValidator, name) )
  97         return false;
  98
  99     // we may have either bitmap or icon: if a bitmap with mask is passed, we
 100     // will transform it to an icon ourselves because otherwise the mask will
 101     // be ignored by Windows
 102     m_isIcon = bitmap.IsKindOf(CLASSINFO(wxIcon));
 103
 104     wxGDIImage *image = ConvertImage( bitmap );
 105     m_isIcon = image->IsKindOf( CLASSINFO(wxIcon) );
 106
 107     // create the native control
 108     if ( !MSWCreateControl(wxT("STATIC"), wxEmptyString, pos, size) )
 109     {
 110         // control creation failed
 111         return false;
 112     }
 113
 114     // no need to delete the new image
 115     SetImageNoCopy(image);
 116
 117     // GetBestSize will work properly now, so set the best size if needed
 118     SetInitialSize(size);
 119
 120     // painting manually is reported not to work under Windows CE (see #10093),
 121     // so don't do it there even if this probably means that alpha is not
 122     // supported there -- but at least bitmaps without alpha appear correctly
 123 #ifndef __WXWINCE__
 124     // Windows versions before XP (and even XP if the application has no
 125     // manifest and so the old comctl32.dll is used) don't draw correctly the
 126     // images with alpha channel so we need to draw them ourselves and it's
 127     // easier to just always do it rather than check if we have an image with
 128     // alpha or not
 129     if ( wxTheApp->GetComCtl32Version() < 600 )
 130     {
 131         Connect(wxEVT_PAINT, wxPaintEventHandler(wxStaticBitmap::DoPaintManually));
 132     }
 133 #endif // !__WXWINCE__
 134
 135     return true;
 136 }
 137
 138 WXDWORD wxStaticBitmap::MSWGetStyle(long style, WXDWORD *exstyle) const
 139 {
 140     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 141
 142     // what kind of control are we?
 143     msStyle |= m_isIcon ? SS_ICON : SS_BITMAP;
 144
 145     // we use SS_CENTERIMAGE to prevent the control from resizing the bitmap to
 146     // fit to its size -- this is unexpected and doesn't happen in other ports
 147     //
 148     // and SS_NOTIFY is necessary to receive mouse events
 149     msStyle |= SS_CENTERIMAGE | SS_NOTIFY;
 150
 151     return msStyle;
 152 }
 153
 154 bool wxStaticBitmap::ImageIsOk() const
 155 {
 156     return m_image && m_image->Ok();
 157 }
 158
 159 wxIcon wxStaticBitmap::GetIcon() const
 160 {
 161     wxCHECK_MSG( m_image, wxIcon(), wxT("no image in wxStaticBitmap") );
 162
 163     // we can't ask for an icon if all we have is a bitmap
 164     wxCHECK_MSG( m_isIcon, wxIcon(), wxT("no icon in this wxStaticBitmap") );
 165
 166     return *(wxIcon *)m_image;
 167 }
 168
 169 wxBitmap wxStaticBitmap::GetBitmap() const
 170 {
 171     if ( m_isIcon )
 172     {
 173         // don't fail because we might have replaced the bitmap with icon
 174         // ourselves internally in ConvertImage() to keep the transparency but
 175         // the user code doesn't know about it so it still can use GetBitmap()
 176         // to retrieve the bitmap
 177         return wxBitmap(GetIcon());
 178     }
 179     else // we have a bitmap
 180     {
 181         wxCHECK_MSG( m_image, wxBitmap(), wxT("no image in wxStaticBitmap") );
 182
 183         return *(wxBitmap *)m_image;
 184     }
 185 }
 186
 187 void wxStaticBitmap::Free()
 188 {
 189     wxDELETE(m_image);
 190 }
 191
 192 wxSize wxStaticBitmap::DoGetBestSize() const
 193 {
 194     if ( ImageIsOk() )
 195     {
 196         wxSize best(m_image->GetWidth(), m_image->GetHeight());
 197         CacheBestSize(best);
 198         return best;
 199     }
 200
 201     // this is completely arbitrary
 202     return wxSize(16, 16);
 203 }
 204
 205 #ifndef __WXWINCE__
 206
 207 void wxStaticBitmap::DoPaintManually(wxPaintEvent& WXUNUSED(event))
 208 {
 209     wxPaintDC dc(this);
 210
 211     const wxSize size(GetSize());
 212     const wxBitmap bmp(GetBitmap());
 213
 214     // Clear the background: notice that we're supposed to be transparent, so
 215     // use the parent background colour if we don't have our own instead of
 216     // falling back to the default
 217     const wxWindow *win = UseBgCol() ? this : GetParent();
 218     dc.SetBrush(win->GetBackgroundColour());
 219     dc.SetPen(*wxTRANSPARENT_PEN);
 220     dc.DrawRectangle(0, 0, size.GetWidth(), size.GetHeight());
 221
 222     // Draw the image in the middle
 223     dc.DrawBitmap(bmp,
 224                   (size.GetWidth() - bmp.GetWidth()) / 2,
 225                   (size.GetHeight() - bmp.GetHeight()) / 2,
 226                   true /* use mask */);
 227 }
 228
 229 #endif // !__WXWINCE__
 230
 231 void wxStaticBitmap::SetImage( const wxGDIImage* image )
 232 {
 233     wxGDIImage* convertedImage = ConvertImage( *image );
 234     SetImageNoCopy( convertedImage );
 235     InvalidateBestSize();
 236 }
 237
 238 void wxStaticBitmap::SetImageNoCopy( wxGDIImage* image)
 239 {
 240     Free();
 241
 242     m_isIcon = image->IsKindOf( CLASSINFO(wxIcon) );
 243     // the image has already been copied
 244     m_image = image;
 245
 246     int x, y;
 247     int w, h;
 248     GetPosition(&x, &y);
 249     GetSize(&w, &h);
 250
 251 #ifdef __WIN32__
 252     HANDLE handle = (HANDLE)m_image->GetHandle();
 253     LONG style = ::GetWindowLong( (HWND)GetHWND(), GWL_STYLE ) ;
 254     ::SetWindowLong( (HWND)GetHWND(), GWL_STYLE, ( style & ~( SS_BITMAP|SS_ICON ) ) |
 255                      ( m_isIcon ? SS_ICON : SS_BITMAP ) );
 256     HGDIOBJ oldHandle = (HGDIOBJ)::SendMessage(GetHwnd(), STM_SETIMAGE,
 257                   m_isIcon ? IMAGE_ICON : IMAGE_BITMAP, (LPARAM)handle);
 258     // detect if this is still the handle we passed before or
 259     // if the static-control made a copy of the bitmap!
 260     if (m_currentHandle != 0 && oldHandle != (HGDIOBJ) m_currentHandle)
 261     {
 262         // the static control made a copy and we are responsible for deleting it
 263         DeleteObject((HGDIOBJ) oldHandle);
 264     }
 265     m_currentHandle = (WXHANDLE)handle;
 266 #endif // Win32
 267
 268     if ( ImageIsOk() )
 269     {
 270         int width = image->GetWidth(),
 271             height = image->GetHeight();
 272         if ( width && height )
 273         {
 274             w = width;
 275             h = height;
 276
 277             ::MoveWindow(GetHwnd(), x, y, width, height, FALSE);
 278         }
 279     }
 280
 281     RECT rect;
 282     rect.left   = x;
 283     rect.top    = y;
 284     rect.right  = x + w;
 285     rect.bottom = y + h;
 286     ::InvalidateRect(GetHwndOf(GetParent()), &rect, TRUE);
 287 }
 288
 289 #endif // wxUSE_STATBMP