src/msw/dragimag.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/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 // 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_DRAGIMAGE
  28
  29 #ifndef WX_PRECOMP
  30 #include <stdio.h>
  31 #include "wx/setup.h"
  32 #include "wx/window.h"
  33 #include "wx/dcclient.h"
  34 #include "wx/dcscreen.h"
  35 #include "wx/dcmemory.h"
  36 #include "wx/settings.h"
  37 #endif
  38
  39 #include "wx/msw/private.h"
  40 #include "wx/log.h"
  41 #include "wx/intl.h"
  42 #include "wx/frame.h"
  43 #include "wx/image.h"
  44
  45 #include "wx/msw/dragimag.h"
  46 #include "wx/msw/private.h"
  47
  48 #ifdef __WXWINCE__  // for SM_CXCURSOR and SM_CYCURSOR
  49 #include "wx/msw/wince/missing.h"
  50 #endif // __WXWINCE__
  51
  52 // include <commctrl.h> "properly"
  53 #include "wx/msw/wrapcctl.h"
  54
  55 // Wine doesn't have this yet
  56 #ifndef ListView_CreateDragImage
  57 #define ListView_CreateDragImage(hwnd, i, lpptUpLeft) \
  58     (HIMAGELIST)SNDMSG((hwnd), LVM_CREATEDRAGIMAGE, (WPARAM)(int)(i), (LPARAM)(LPPOINT)(lpptUpLeft))
  59 #endif
  60
  61 // ----------------------------------------------------------------------------
  62 // macros
  63 // ----------------------------------------------------------------------------
  64
  65 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  66
  67 #define GetHimageList() ((HIMAGELIST) m_hImageList)
  68
  69 // ============================================================================
  70 // implementation
  71 // ============================================================================
  72
  73 // ----------------------------------------------------------------------------
  74 // wxDragImage ctors/dtor
  75 // ----------------------------------------------------------------------------
  76
  77 wxDragImage::wxDragImage()
  78 {
  79     Init();
  80 }
  81
  82 wxDragImage::~wxDragImage()
  83 {
  84     if ( m_hImageList )
  85         ImageList_Destroy(GetHimageList());
  86 #if !wxUSE_SIMPLER_DRAGIMAGE
  87     if ( m_hCursorImageList )
  88         ImageList_Destroy((HIMAGELIST) m_hCursorImageList);
  89 #endif
  90 }
  91
  92 void wxDragImage::Init()
  93 {
  94     m_hImageList = 0;
  95 #if !wxUSE_SIMPLER_DRAGIMAGE
  96     m_hCursorImageList = 0;
  97 #endif
  98     m_window = (wxWindow*) NULL;
  99     m_fullScreen = false;
 100 }
 101
 102 // Attributes
 103 ////////////////////////////////////////////////////////////////////////////
 104
 105
 106 // Operations
 107 ////////////////////////////////////////////////////////////////////////////
 108
 109 // Create a drag image from a bitmap and optional cursor
 110 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
 111 {
 112     if ( m_hImageList )
 113         ImageList_Destroy(GetHimageList());
 114     m_hImageList = 0;
 115
 116 #ifdef __WXWINCE__
 117     UINT flags = ILC_COLOR;
 118 #else
 119     UINT flags wxDUMMY_INITIALIZE(0) ;
 120     if (image.GetDepth() <= 4)
 121         flags = ILC_COLOR4;
 122     else if (image.GetDepth() <= 8)
 123         flags = ILC_COLOR8;
 124     else if (image.GetDepth() <= 16)
 125         flags = ILC_COLOR16;
 126     else if (image.GetDepth() <= 24)
 127         flags = ILC_COLOR24;
 128     else
 129         flags = ILC_COLOR32;
 130 #endif
 131
 132     bool mask = (image.GetMask() != 0);
 133
 134     // Curiously, even if the image doesn't have a mask,
 135     // we still have to use ILC_MASK or the image won't show
 136     // up when dragged.
 137 //    if ( mask )
 138     flags |= ILC_MASK;
 139
 140     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 141
 142     int index;
 143     if (!mask)
 144     {
 145         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 146         index = ImageList_Add(GetHimageList(), hBitmap1, 0);
 147     }
 148     else
 149     {
 150         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 151         HBITMAP hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
 152         HBITMAP hbmpMask = wxInvertMask(hBitmap2);
 153
 154         index = ImageList_Add(GetHimageList(), hBitmap1, hbmpMask);
 155         ::DeleteObject(hbmpMask);
 156     }
 157     if ( index == -1 )
 158     {
 159         wxLogError(_("Couldn't add an image to the image list."));
 160     }
 161     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 162
 163     return (index != -1) ;
 164 }
 165
 166 // Create a drag image from an icon and optional cursor
 167 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor)
 168 {
 169     if ( m_hImageList )
 170         ImageList_Destroy(GetHimageList());
 171     m_hImageList = 0;
 172
 173 #ifdef __WXWINCE__
 174     UINT flags = ILC_COLOR;
 175 #else
 176     UINT flags wxDUMMY_INITIALIZE(0) ;
 177     if (image.GetDepth() <= 4)
 178         flags = ILC_COLOR4;
 179     else if (image.GetDepth() <= 8)
 180         flags = ILC_COLOR8;
 181     else if (image.GetDepth() <= 16)
 182         flags = ILC_COLOR16;
 183     else if (image.GetDepth() <= 24)
 184         flags = ILC_COLOR24;
 185     else
 186         flags = ILC_COLOR32;
 187 #endif
 188     bool mask = true;
 189     if ( mask )
 190         flags |= ILC_MASK;
 191
 192     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 193
 194     HICON hIcon = (HICON) image.GetHICON();
 195
 196     int index = ImageList_AddIcon(GetHimageList(), hIcon);
 197     if ( index == -1 )
 198     {
 199         wxLogError(_("Couldn't add an image to the image list."));
 200     }
 201
 202     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 203
 204     return (index != -1) ;
 205 }
 206
 207 // Create a drag image from a string and optional cursor
 208 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor)
 209 {
 210     wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 211
 212     long w, h;
 213     wxScreenDC dc;
 214     dc.SetFont(font);
 215     dc.GetTextExtent(str, & w, & h);
 216     dc.SetFont(wxNullFont);
 217
 218     wxMemoryDC dc2;
 219     dc2.SetFont(font);
 220     wxBitmap bitmap((int) w+2, (int) h+2);
 221     dc2.SelectObject(bitmap);
 222
 223     dc2.SetBackground(* wxWHITE_BRUSH);
 224     dc2.Clear();
 225     dc2.SetBackgroundMode(wxTRANSPARENT);
 226     dc2.SetTextForeground(* wxLIGHT_GREY);
 227     dc2.DrawText(str, 0, 0);
 228     dc2.DrawText(str, 1, 0);
 229     dc2.DrawText(str, 2, 0);
 230     dc2.DrawText(str, 1, 1);
 231     dc2.DrawText(str, 2, 1);
 232     dc2.DrawText(str, 1, 2);
 233     dc2.DrawText(str, 2, 2);
 234     dc2.SetTextForeground(* wxBLACK);
 235     dc2.DrawText(str, 1, 1);
 236
 237     dc2.SelectObject(wxNullBitmap);
 238
 239     // Make the bitmap masked
 240     wxImage image = bitmap.ConvertToImage();
 241     image.SetMaskColour(255, 255, 255);
 242     return Create(wxBitmap(image), cursor);
 243 }
 244
 245 #if wxUSE_TREECTRL
 246 // Create a drag image for the given tree control item
 247 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 248 {
 249     if ( m_hImageList )
 250         ImageList_Destroy(GetHimageList());
 251     m_hImageList = (WXHIMAGELIST)
 252         TreeView_CreateDragImage(GetHwndOf(&treeCtrl), (HTREEITEM) id.m_pItem);
 253     return m_hImageList != 0;
 254 }
 255 #endif
 256
 257 #if wxUSE_LISTCTRL
 258 // Create a drag image for the given list control item
 259 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 260 {
 261     if ( m_hImageList )
 262         ImageList_Destroy(GetHimageList());
 263     POINT pt;
 264     pt.x = 0; pt.y = 0;
 265     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 266     return true;
 267 }
 268 #endif
 269
 270 // Begin drag
 271 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen, wxRect* rect)
 272 {
 273     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 274     wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
 275
 276     m_fullScreen = fullScreen;
 277     if (rect)
 278         m_boundingRect = * rect;
 279
 280     bool ret = (ImageList_BeginDrag(GetHimageList(), 0, hotspot.x, hotspot.y) != 0);
 281
 282     if (!ret)
 283     {
 284         wxFAIL_MSG( _T("BeginDrag failed.") );
 285
 286         return false;
 287     }
 288
 289     if (m_cursor.Ok())
 290     {
 291 #if wxUSE_SIMPLER_DRAGIMAGE
 292         m_oldCursor = window->GetCursor();
 293         window->SetCursor(m_cursor);
 294 #else
 295         if (!m_hCursorImageList)
 296         {
 297             int cxCursor = ::GetSystemMetrics(SM_CXCURSOR);
 298             int cyCursor = ::GetSystemMetrics(SM_CYCURSOR);
 299
 300             m_hCursorImageList = (WXHIMAGELIST) ImageList_Create(cxCursor, cyCursor, ILC_MASK, 1, 1);
 301         }
 302
 303         // See if we can find the cursor hotspot
 304         wxPoint curHotSpot(hotspot);
 305
 306         // Although it seems to produce the right position, when the hotspot goeos
 307         // negative it has strange effects on the image.
 308         // How do we stop the cursor jumping right and below of where it should be?
 309 #if 0
 310         ICONINFO iconInfo;
 311         if (::GetIconInfo((HICON) (HCURSOR) m_cursor.GetHCURSOR(), & iconInfo) != 0)
 312         {
 313             curHotSpot.x -= iconInfo.xHotspot;
 314             curHotSpot.y -= iconInfo.yHotspot;
 315         }
 316 #endif
 317         //wxString msg;
 318         //msg.Printf("Hotspot = %d, %d", curHotSpot.x, curHotSpot.y);
 319         //wxLogDebug(msg);
 320
 321         // First add the cursor to the image list
 322         HCURSOR hCursor = (HCURSOR) m_cursor.GetHCURSOR();
 323         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hCursorImageList, (HICON) hCursor);
 324
 325         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 326
 327         if (cursorIndex != -1)
 328         {
 329             ImageList_SetDragCursorImage((HIMAGELIST) m_hCursorImageList, cursorIndex, curHotSpot.x, curHotSpot.y);
 330         }
 331 #endif
 332     }
 333
 334 #if !wxUSE_SIMPLER_DRAGIMAGE
 335     if (m_cursor.Ok())
 336         ::ShowCursor(FALSE);
 337 #endif
 338
 339     m_window = window;
 340
 341     ::SetCapture(GetHwndOf(window));
 342
 343     return true;
 344 }
 345
 346 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 347 // corner of the image. This is full screen only. fullScreenRect gives the
 348 // position of the window on the screen, to restrict the drag to.
 349 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 350 {
 351     wxRect rect;
 352
 353     int x = fullScreenRect->GetPosition().x;
 354     int y = fullScreenRect->GetPosition().y;
 355
 356     wxSize sz = fullScreenRect->GetSize();
 357
 358     if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
 359         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 360
 361     rect.x = x; rect.y = y;
 362     rect.width = sz.x; rect.height = sz.y;
 363
 364     return BeginDrag(hotspot, window, true, & rect);
 365 }
 366
 367 // End drag
 368 bool wxDragImage::EndDrag()
 369 {
 370     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 371
 372     ImageList_EndDrag();
 373
 374     if ( !::ReleaseCapture() )
 375     {
 376         wxLogLastError(wxT("ReleaseCapture"));
 377     }
 378
 379 #if wxUSE_SIMPLER_DRAGIMAGE
 380     if (m_cursor.Ok() && m_oldCursor.Ok())
 381         m_window->SetCursor(m_oldCursor);
 382 #else
 383     ::ShowCursor(TRUE);
 384 #endif
 385
 386     m_window = (wxWindow*) NULL;
 387
 388     return true;
 389 }
 390
 391 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 392 // is non-NULL, or in screen coordinates if NULL.
 393 bool wxDragImage::Move(const wxPoint& pt)
 394 {
 395     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 396
 397     // These are in window, not client coordinates.
 398     // So need to convert to client coordinates.
 399     wxPoint pt2(pt);
 400     if (m_window && !m_fullScreen)
 401     {
 402         RECT rect;
 403         rect.left = 0; rect.top = 0;
 404         rect.right = 0; rect.bottom = 0;
 405         DWORD style = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_STYLE);
 406 #ifdef __WIN32__
 407         DWORD exStyle = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_EXSTYLE);
 408         ::AdjustWindowRectEx(& rect, style, FALSE, exStyle);
 409 #else
 410         ::AdjustWindowRect(& rect, style, FALSE);
 411 #endif
 412         // Subtract the (negative) values, i.e. add a small increment
 413         pt2.x -= rect.left; pt2.y -= rect.top;
 414     }
 415     else if (m_window && m_fullScreen)
 416     {
 417         pt2 = m_window->ClientToScreen(pt2);
 418     }
 419
 420     bool ret = (ImageList_DragMove( pt2.x, pt2.y ) != 0);
 421
 422     m_position = pt2;
 423
 424     return ret;
 425 }
 426
 427 bool wxDragImage::Show()
 428 {
 429     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 430
 431     HWND hWnd = 0;
 432     if (m_window && !m_fullScreen)
 433         hWnd = (HWND) m_window->GetHWND();
 434
 435     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 436
 437     return ret;
 438 }
 439
 440 bool wxDragImage::Hide()
 441 {
 442     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 443
 444     HWND hWnd = 0;
 445     if (m_window && !m_fullScreen)
 446         hWnd = (HWND) m_window->GetHWND();
 447
 448     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 449
 450     return ret;
 451 }
 452
 453 #endif // wxUSE_DRAGIMAGE