src/msw/dragimag.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dragimag.cpp
   3 // Purpose:     wxDragImage
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     08/04/99
   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 #ifdef __GNUG__
  21 #pragma implementation "dragimag.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26 #include "wx/msw/private.h"
  27
  28 #ifdef __BORLANDC__
  29 #pragma hdrstop
  30 #endif
  31
  32 #if defined(__WIN95__)
  33
  34 #ifndef WX_PRECOMP
  35 #include <stdio.h>
  36 #include "wx/setup.h"
  37 #include "wx/window.h"
  38 #include "wx/dcclient.h"
  39 #include "wx/dcscreen.h"
  40 #include "wx/dcmemory.h"
  41 #include "wx/settings.h"
  42 #endif
  43
  44 #include "wx/log.h"
  45 #include "wx/intl.h"
  46 #include "wx/frame.h"
  47 #include "wx/image.h"
  48
  49 #include "wx/msw/dragimag.h"
  50 #include "wx/msw/private.h"
  51
  52 #if defined(__WIN95__) && !(defined(__GNUWIN32_OLD__) || defined(__TWIN32__))
  53 #include <commctrl.h>
  54 #endif
  55
  56 // ----------------------------------------------------------------------------
  57 // macros
  58 // ----------------------------------------------------------------------------
  59
  60 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  61
  62 #define GetHimageList() ((HIMAGELIST) m_hImageList)
  63
  64 // ============================================================================
  65 // implementation
  66 // ============================================================================
  67
  68 // ----------------------------------------------------------------------------
  69 // wxDragImage ctors/dtor
  70 // ----------------------------------------------------------------------------
  71
  72 wxDragImage::wxDragImage()
  73 {
  74     Init();
  75 }
  76
  77 wxDragImage::~wxDragImage()
  78 {
  79     if ( m_hImageList )
  80         ImageList_Destroy(GetHimageList());
  81 #if !wxUSE_SIMPLER_DRAGIMAGE
  82     if ( m_hCursorImageList )
  83         ImageList_Destroy((HIMAGELIST) m_hCursorImageList);
  84 #endif
  85 }
  86
  87 void wxDragImage::Init()
  88 {
  89     m_hImageList = 0;
  90 #if !wxUSE_SIMPLER_DRAGIMAGE
  91     m_hCursorImageList = 0;
  92 #endif
  93     m_window = (wxWindow*) NULL;
  94     m_fullScreen = FALSE;
  95 }
  96
  97 // Attributes
  98 ////////////////////////////////////////////////////////////////////////////
  99
 100
 101 // Operations
 102 ////////////////////////////////////////////////////////////////////////////
 103
 104 // Create a drag image from a bitmap and optional cursor
 105 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
 106 {
 107     if ( m_hImageList )
 108         ImageList_Destroy(GetHimageList());
 109     m_hImageList = 0;
 110
 111     UINT flags = 0 ;
 112     if (image.GetDepth() <= 4)
 113         flags = ILC_COLOR4;
 114     else if (image.GetDepth() <= 8)
 115         flags = ILC_COLOR8;
 116     else if (image.GetDepth() <= 16)
 117         flags = ILC_COLOR16;
 118     else if (image.GetDepth() <= 24)
 119         flags = ILC_COLOR24;
 120     else
 121         flags = ILC_COLOR32;
 122
 123     bool mask = (image.GetMask() != 0);
 124     if ( mask )
 125         flags |= ILC_MASK;
 126
 127     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 128
 129     int index;
 130     if (!mask)
 131     {
 132         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 133         index = ImageList_Add(GetHimageList(), hBitmap1, 0);
 134     }
 135     else
 136     {
 137         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 138         HBITMAP hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
 139         HBITMAP hbmpMask = wxInvertMask(hBitmap2);
 140
 141         index = ImageList_Add(GetHimageList(), hBitmap1, hbmpMask);
 142         ::DeleteObject(hbmpMask);
 143     }
 144     if ( index == -1 )
 145     {
 146         wxLogError(_("Couldn't add an image to the image list."));
 147     }
 148     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 149     m_cursorHotspot = cursorHotspot;
 150
 151     return (index != -1) ;
 152 }
 153
 154 // Create a drag image from an icon and optional cursor
 155 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
 156 {
 157     if ( m_hImageList )
 158         ImageList_Destroy(GetHimageList());
 159     m_hImageList = 0;
 160
 161     UINT flags = 0 ;
 162     if (image.GetDepth() <= 4)
 163         flags = ILC_COLOR4;
 164     else if (image.GetDepth() <= 8)
 165         flags = ILC_COLOR8;
 166     else if (image.GetDepth() <= 16)
 167         flags = ILC_COLOR16;
 168     else if (image.GetDepth() <= 24)
 169         flags = ILC_COLOR24;
 170     else
 171         flags = ILC_COLOR32;
 172     bool mask = TRUE;
 173     if ( mask )
 174         flags |= ILC_MASK;
 175
 176     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 177
 178     HICON hIcon = (HICON) image.GetHICON();
 179
 180     int index = ImageList_AddIcon(GetHimageList(), hIcon);
 181     if ( index == -1 )
 182     {
 183         wxLogError(_("Couldn't add an image to the image list."));
 184     }
 185
 186     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 187     m_cursorHotspot = cursorHotspot;
 188
 189     return (index != -1) ;
 190 }
 191
 192 // Create a drag image from a string and optional cursor
 193 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& cursorHotspot)
 194 {
 195     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 196
 197     long w, h;
 198     wxScreenDC dc;
 199     dc.SetFont(font);
 200     dc.GetTextExtent(str, & w, & h);
 201     dc.SetFont(wxNullFont);
 202
 203     wxMemoryDC dc2;
 204     dc2.SetFont(font);
 205     wxBitmap bitmap((int) w+2, (int) h+2);
 206     dc2.SelectObject(bitmap);
 207
 208     dc2.SetBackground(* wxWHITE_BRUSH);
 209     dc2.Clear();
 210     dc2.SetBackgroundMode(wxTRANSPARENT);
 211     dc2.SetTextForeground(* wxLIGHT_GREY);
 212     dc2.DrawText(str, 0, 0);
 213     dc2.DrawText(str, 1, 0);
 214     dc2.DrawText(str, 2, 0);
 215     dc2.DrawText(str, 1, 1);
 216     dc2.DrawText(str, 2, 1);
 217     dc2.DrawText(str, 1, 2);
 218     dc2.DrawText(str, 2, 2);
 219     dc2.SetTextForeground(* wxBLACK);
 220     dc2.DrawText(str, 1, 1);
 221
 222     dc2.SelectObject(wxNullBitmap);
 223
 224     // Make the bitmap masked
 225     wxImage image(bitmap);
 226     image.SetMaskColour(255, 255, 255);
 227     bitmap = image.ConvertToBitmap();
 228
 229     return Create(bitmap, cursor, cursorHotspot);
 230 }
 231
 232 // Create a drag image for the given tree control item
 233 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 234 {
 235     if ( m_hImageList )
 236         ImageList_Destroy(GetHimageList());
 237     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 238     return TRUE;
 239 }
 240
 241 // Create a drag image for the given list control item
 242 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 243 {
 244     if ( m_hImageList )
 245         ImageList_Destroy(GetHimageList());
 246     POINT pt;
 247     pt.x = 0; pt.y = 0;
 248     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 249     return TRUE;
 250 }
 251
 252 // Begin drag
 253 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen, wxRect* rect)
 254 {
 255     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 256     wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
 257
 258     m_fullScreen = fullScreen;
 259     if (rect)
 260         m_boundingRect = * rect;
 261
 262     bool ret = (ImageList_BeginDrag(GetHimageList(), 0, hotspot.x, hotspot.y) != 0);
 263
 264     if (!ret)
 265     {
 266         wxFAIL_MSG( _T("BeginDrag failed.") );
 267
 268         return FALSE;
 269     }
 270
 271     if (m_cursor.Ok())
 272     {
 273 #if wxUSE_SIMPLER_DRAGIMAGE
 274             m_oldCursor = window->GetCursor();
 275             window->SetCursor(m_cursor);
 276 #else
 277         if (!m_hCursorImageList)
 278         {
 279             int cxCursor = GetSystemMetrics(SM_CXCURSOR);
 280             int cyCursor = GetSystemMetrics(SM_CYCURSOR);
 281
 282             m_hCursorImageList = (WXHIMAGELIST) ImageList_Create(cxCursor, cyCursor, ILC_MASK, 1, 1);
 283         }
 284
 285         // First add the cursor to the image list
 286         HCURSOR hCursor = (HCURSOR) m_cursor.GetHCURSOR();
 287         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hCursorImageList, (HICON) hCursor);
 288
 289         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 290
 291         if (cursorIndex != -1)
 292         {
 293             ImageList_SetDragCursorImage((HIMAGELIST) m_hCursorImageList, cursorIndex, m_cursorHotspot.x, m_cursorHotspot.y);
 294         }
 295 #endif
 296     }
 297
 298     m_window = window;
 299
 300 #if !wxUSE_SIMPLER_DRAGIMAGE
 301     if (m_cursor.Ok())
 302         ::ShowCursor(FALSE);
 303 #endif
 304
 305     ::SetCapture(GetHwndOf(window));
 306
 307     return TRUE;
 308 }
 309
 310 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 311 // corner of the image. This is full screen only. fullScreenRect gives the
 312 // position of the window on the screen, to restrict the drag to.
 313 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 314 {
 315     wxRect rect;
 316
 317     int x = fullScreenRect->GetPosition().x;
 318     int y = fullScreenRect->GetPosition().y;
 319
 320     wxSize sz = fullScreenRect->GetSize();
 321
 322     if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
 323         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 324
 325     rect.x = x; rect.y = y;
 326     rect.width = sz.x; rect.height = sz.y;
 327
 328     return BeginDrag(hotspot, window, TRUE, & rect);
 329 }
 330
 331 // End drag
 332 bool wxDragImage::EndDrag()
 333 {
 334     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 335
 336     ImageList_EndDrag();
 337
 338     if ( !::ReleaseCapture() )
 339     {
 340         wxLogLastError(wxT("ReleaseCapture"));
 341     }
 342
 343 #if wxUSE_SIMPLER_DRAGIMAGE
 344     if (m_cursor.Ok() && m_oldCursor.Ok())
 345             m_window->SetCursor(m_oldCursor);
 346 #else
 347     ::ShowCursor(TRUE);
 348 #endif
 349
 350     m_window = (wxWindow*) NULL;
 351
 352     return TRUE;
 353 }
 354
 355 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 356 // is non-NULL, or in screen coordinates if NULL.
 357 bool wxDragImage::Move(const wxPoint& pt)
 358 {
 359     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 360
 361     // These are in window, not client coordinates.
 362     // So need to convert to client coordinates.
 363     wxPoint pt2(pt);
 364     if (m_window)
 365     {
 366         RECT rect;
 367         rect.left = 0; rect.top = 0;
 368         rect.right = 0; rect.bottom = 0;
 369         DWORD style = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_STYLE);
 370 #ifdef __WIN32__
 371         DWORD exStyle = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_EXSTYLE);
 372         ::AdjustWindowRectEx(& rect, style, FALSE, exStyle);
 373 #else
 374         ::AdjustWindowRect(& rect, style, FALSE);
 375 #endif
 376         // Subtract the (negative) values, i.e. add a small increment
 377         pt2.x -= rect.left; pt2.y -= rect.top;
 378     }
 379
 380     bool ret = (ImageList_DragMove( pt2.x, pt2.y ) != 0);
 381
 382     m_position = pt;
 383
 384     return ret;
 385 }
 386
 387 bool wxDragImage::Show()
 388 {
 389     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 390
 391     HWND hWnd = 0;
 392     if (m_window && !m_fullScreen)
 393         hWnd = (HWND) m_window->GetHWND();
 394
 395     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 396
 397     return ret;
 398 }
 399
 400 bool wxDragImage::Hide()
 401 {
 402     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 403
 404     HWND hWnd = 0;
 405     if (m_window && !m_fullScreen)
 406         hWnd = (HWND) m_window->GetHWND();
 407
 408     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 409
 410     return ret;
 411 }
 412
 413 #endif
 414     // __WIN95__
 415