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 // Copyright:   (c) Julian Smart
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ===========================================================================
  12 // declarations
  13 // ===========================================================================
  14
  15 // ---------------------------------------------------------------------------
  16 // headers
  17 // ---------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_STATBMP
  27
  28 #include "wx/statbmp.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/app.h"
  32     #include "wx/window.h"
  33     #include "wx/icon.h"
  34     #include "wx/dcclient.h"
  35 #endif
  36
  37 #include "wx/msw/private.h"
  38
  39 #include "wx/sysopt.h"
  40
  41 #include <stdio.h>
  42
  43 // ---------------------------------------------------------------------------
  44 // macros
  45 // ---------------------------------------------------------------------------
  46
  47 wxBEGIN_EVENT_TABLE(wxStaticBitmap, wxStaticBitmapBase)
  48     EVT_SIZE(wxStaticBitmap::WXHandleSize)
  49 wxEND_EVENT_TABLE()
  50
  51 // ===========================================================================
  52 // implementation
  53 // ===========================================================================
  54
  55 // ---------------------------------------------------------------------------
  56 // wxStaticBitmap
  57 // ---------------------------------------------------------------------------
  58
  59 // we may have either bitmap or icon: if a bitmap with mask is passed, we
  60 // will transform it to an icon ourselves because otherwise the mask will
  61 // be ignored by Windows
  62 // note that this function will create a new object every time
  63 // it is called even if the image needs no conversion
  64
  65 static wxGDIImage* ConvertImage( const wxGDIImage& bitmap )
  66 {
  67     bool isIcon = bitmap.IsKindOf( wxCLASSINFO(wxIcon) );
  68
  69     if( !isIcon )
  70     {
  71         wxASSERT_MSG( wxDynamicCast(&bitmap, wxBitmap),
  72                       wxT("not an icon and not a bitmap?") );
  73
  74         const wxBitmap& bmp = (const wxBitmap&)bitmap;
  75         wxMask *mask = bmp.GetMask();
  76         if ( mask && mask->GetMaskBitmap() )
  77         {
  78             wxIcon* icon = new wxIcon;
  79             icon->CopyFromBitmap(bmp);
  80
  81             return icon;
  82         }
  83
  84         return new wxBitmap( bmp );
  85     }
  86
  87     // copying a bitmap is a cheap operation
  88     return new wxIcon( (const wxIcon&)bitmap );
  89 }
  90
  91 bool wxStaticBitmap::Create(wxWindow *parent,
  92                             wxWindowID id,
  93                             const wxGDIImage& bitmap,
  94                             const wxPoint& pos,
  95                             const wxSize& size,
  96                             long style,
  97                             const wxString& name)
  98 {
  99     if ( !CreateControl(parent, id, pos, size, style, wxDefaultValidator, name) )
 100         return false;
 101
 102     // we may have either bitmap or icon: if a bitmap with mask is passed, we
 103     // will transform it to an icon ourselves because otherwise the mask will
 104     // be ignored by Windows
 105     m_isIcon = bitmap.IsKindOf(wxCLASSINFO(wxIcon));
 106
 107     wxGDIImage *image = ConvertImage( bitmap );
 108     m_isIcon = image->IsKindOf( wxCLASSINFO(wxIcon) );
 109
 110     // create the native control
 111     if ( !MSWCreateControl(wxT("STATIC"), wxEmptyString, pos, size) )
 112     {
 113         // control creation failed
 114         return false;
 115     }
 116
 117     // no need to delete the new image
 118     SetImageNoCopy(image);
 119
 120     // GetBestSize will work properly now, so set the best size if needed
 121     SetInitialSize(size);
 122
 123     // painting manually is reported not to work under Windows CE (see #10093),
 124     // so don't do it there even if this probably means that alpha is not
 125     // supported there -- but at least bitmaps without alpha appear correctly
 126 #ifndef __WXWINCE__
 127     // Windows versions before XP (and even XP if the application has no
 128     // manifest and so the old comctl32.dll is used) don't draw correctly the
 129     // images with alpha channel so we need to draw them ourselves and it's
 130     // easier to just always do it rather than check if we have an image with
 131     // alpha or not
 132     if ( wxTheApp->GetComCtl32Version() < 600 )
 133     {
 134         Connect(wxEVT_PAINT, wxPaintEventHandler(wxStaticBitmap::DoPaintManually));
 135     }
 136 #endif // !__WXWINCE__
 137
 138     return true;
 139 }
 140
 141 WXDWORD wxStaticBitmap::MSWGetStyle(long style, WXDWORD *exstyle) const
 142 {
 143     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 144
 145     // what kind of control are we?
 146     msStyle |= m_isIcon ? SS_ICON : SS_BITMAP;
 147
 148     // we use SS_CENTERIMAGE to prevent the control from resizing the bitmap to
 149     // fit to its size -- this is unexpected and doesn't happen in other ports
 150     //
 151     // and SS_NOTIFY is necessary to receive mouse events
 152     msStyle |= SS_CENTERIMAGE | SS_NOTIFY;
 153
 154     return msStyle;
 155 }
 156
 157 bool wxStaticBitmap::ImageIsOk() const
 158 {
 159     return m_image && m_image->IsOk();
 160 }
 161
 162 wxIcon wxStaticBitmap::GetIcon() const
 163 {
 164     wxCHECK_MSG( m_image, wxIcon(), wxT("no image in wxStaticBitmap") );
 165
 166     // we can't ask for an icon if all we have is a bitmap
 167     wxCHECK_MSG( m_isIcon, wxIcon(), wxT("no icon in this wxStaticBitmap") );
 168
 169     return *(wxIcon *)m_image;
 170 }
 171
 172 wxBitmap wxStaticBitmap::GetBitmap() const
 173 {
 174     if ( m_isIcon )
 175     {
 176         // don't fail because we might have replaced the bitmap with icon
 177         // ourselves internally in ConvertImage() to keep the transparency but
 178         // the user code doesn't know about it so it still can use GetBitmap()
 179         // to retrieve the bitmap
 180         return wxBitmap(GetIcon());
 181     }
 182     else // we have a bitmap
 183     {
 184         wxCHECK_MSG( m_image, wxBitmap(), wxT("no image in wxStaticBitmap") );
 185
 186         return *(wxBitmap *)m_image;
 187     }
 188 }
 189
 190 void wxStaticBitmap::Free()
 191 {
 192     wxDELETE(m_image);
 193 }
 194
 195 wxSize wxStaticBitmap::DoGetBestClientSize() const
 196 {
 197     wxSize size;
 198     if ( ImageIsOk() )
 199     {
 200         size = m_image->GetSize();
 201     }
 202     else // No image yet
 203     {
 204         // this is completely arbitrary
 205         size.x =
 206         size.y = 16;
 207     }
 208
 209     return size;
 210 }
 211
 212 void wxStaticBitmap::WXHandleSize(wxSizeEvent& event)
 213 {
 214     // Invalidate everything when our size changes as the image position (it's
 215     // drawn centred in the window client area) changes.
 216     Refresh();
 217
 218     event.Skip();
 219 }
 220
 221 #ifndef __WXWINCE__
 222
 223 void wxStaticBitmap::DoPaintManually(wxPaintEvent& WXUNUSED(event))
 224 {
 225     wxPaintDC dc(this);
 226
 227     const wxSize size(GetSize());
 228     const wxBitmap bmp(GetBitmap());
 229
 230     // Clear the background: notice that we're supposed to be transparent, so
 231     // use the parent background colour if we don't have our own instead of
 232     // falling back to the default
 233     const wxWindow *win = UseBgCol() ? this : GetParent();
 234     dc.SetBrush(win->GetBackgroundColour());
 235     dc.SetPen(*wxTRANSPARENT_PEN);
 236     dc.DrawRectangle(0, 0, size.GetWidth(), size.GetHeight());
 237
 238     // Draw the image in the middle
 239     dc.DrawBitmap(bmp,
 240                   (size.GetWidth() - bmp.GetWidth()) / 2,
 241                   (size.GetHeight() - bmp.GetHeight()) / 2,
 242                   true /* use mask */);
 243 }
 244
 245 #endif // !__WXWINCE__
 246
 247 void wxStaticBitmap::SetImage( const wxGDIImage* image )
 248 {
 249     wxGDIImage* convertedImage = ConvertImage( *image );
 250     SetImageNoCopy( convertedImage );
 251 }
 252
 253 void wxStaticBitmap::SetImageNoCopy( wxGDIImage* image)
 254 {
 255     Free();
 256     InvalidateBestSize();
 257
 258     m_isIcon = image->IsKindOf( wxCLASSINFO(wxIcon) );
 259     // the image has already been copied
 260     m_image = image;
 261
 262     int x, y;
 263     int w, h;
 264     GetPosition(&x, &y);
 265     GetSize(&w, &h);
 266
 267 #ifdef __WIN32__
 268     HANDLE handle = (HANDLE)m_image->GetHandle();
 269     LONG style = ::GetWindowLong( (HWND)GetHWND(), GWL_STYLE ) ;
 270     ::SetWindowLong( (HWND)GetHWND(), GWL_STYLE, ( style & ~( SS_BITMAP|SS_ICON ) ) |
 271                      ( m_isIcon ? SS_ICON : SS_BITMAP ) );
 272     HGDIOBJ oldHandle = (HGDIOBJ)::SendMessage(GetHwnd(), STM_SETIMAGE,
 273                   m_isIcon ? IMAGE_ICON : IMAGE_BITMAP, (LPARAM)handle);
 274     // detect if this is still the handle we passed before or
 275     // if the static-control made a copy of the bitmap!
 276     if (m_currentHandle != 0 && oldHandle != (HGDIOBJ) m_currentHandle)
 277     {
 278         // the static control made a copy and we are responsible for deleting it
 279         DeleteObject((HGDIOBJ) oldHandle);
 280     }
 281     m_currentHandle = (WXHANDLE)handle;
 282 #endif // Win32
 283
 284     if ( ImageIsOk() )
 285     {
 286         int width = image->GetWidth(),
 287             height = image->GetHeight();
 288         if ( width && height )
 289         {
 290             w = width;
 291             h = height;
 292
 293             ::MoveWindow(GetHwnd(), x, y, width, height, FALSE);
 294         }
 295     }
 296
 297     RECT rect;
 298     rect.left   = x;
 299     rect.top    = y;
 300     rect.right  = x + w;
 301     rect.bottom = y + h;
 302     ::InvalidateRect(GetHwndOf(GetParent()), &rect, TRUE);
 303 }
 304
 305 #endif // wxUSE_STATBMP