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 "wx/msw/wrapcctl.h" // include <commctrl.h> "properly"
  31     #include <stdio.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     #include "wx/intl.h"
  38     #include "wx/log.h"
  39     #include "wx/frame.h"
  40     #include "wx/image.h"
  41 #endif
  42
  43 #include "wx/msw/private.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 // Wine doesn't have this yet
  53 #ifndef ListView_CreateDragImage
  54 #define ListView_CreateDragImage(hwnd, i, lpptUpLeft) \
  55     (HIMAGELIST)SNDMSG((hwnd), LVM_CREATEDRAGIMAGE, (WPARAM)(int)(i), (LPARAM)(LPPOINT)(lpptUpLeft))
  56 #endif
  57
  58 // ----------------------------------------------------------------------------
  59 // macros
  60 // ----------------------------------------------------------------------------
  61
  62 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  63
  64 #define GetHimageList() ((HIMAGELIST) m_hImageList)
  65
  66 // ============================================================================
  67 // implementation
  68 // ============================================================================
  69
  70 // ----------------------------------------------------------------------------
  71 // wxDragImage ctors/dtor
  72 // ----------------------------------------------------------------------------
  73
  74 wxDragImage::wxDragImage()
  75 {
  76     Init();
  77 }
  78
  79 wxDragImage::~wxDragImage()
  80 {
  81     if ( m_hImageList )
  82         ImageList_Destroy(GetHimageList());
  83 #if !wxUSE_SIMPLER_DRAGIMAGE
  84     if ( m_hCursorImageList )
  85         ImageList_Destroy((HIMAGELIST) m_hCursorImageList);
  86 #endif
  87 }
  88
  89 void wxDragImage::Init()
  90 {
  91     m_hImageList = 0;
  92 #if !wxUSE_SIMPLER_DRAGIMAGE
  93     m_hCursorImageList = 0;
  94 #endif
  95     m_window = NULL;
  96     m_fullScreen = false;
  97 }
  98
  99 #if WXWIN_COMPATIBILITY_2_8
 100 wxDragImage::wxDragImage(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 101 {
 102     Init();
 103
 104     Create(image, cursor);
 105 }
 106
 107 wxDragImage::wxDragImage(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 108 {
 109     Init();
 110
 111     Create(image, cursor);
 112 }
 113
 114 wxDragImage::wxDragImage(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 115 {
 116     Init();
 117
 118     Create(str, cursor);
 119 }
 120
 121 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 122 {
 123     return Create(image, cursor);
 124 }
 125
 126 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 127 {
 128     return Create(image, cursor);
 129 }
 130
 131 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 132 {
 133     return Create(str, cursor);
 134 }
 135 #endif // WXWIN_COMPATIBILITY_2_8
 136
 137 // Attributes
 138 ////////////////////////////////////////////////////////////////////////////
 139
 140
 141 // Operations
 142 ////////////////////////////////////////////////////////////////////////////
 143
 144 // Create a drag image from a bitmap and optional cursor
 145 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
 146 {
 147     if ( m_hImageList )
 148         ImageList_Destroy(GetHimageList());
 149     m_hImageList = 0;
 150
 151 #ifdef __WXWINCE__
 152     UINT flags = ILC_COLOR;
 153 #else
 154     UINT flags wxDUMMY_INITIALIZE(0) ;
 155     if (image.GetDepth() <= 4)
 156         flags = ILC_COLOR4;
 157     else if (image.GetDepth() <= 8)
 158         flags = ILC_COLOR8;
 159     else if (image.GetDepth() <= 16)
 160         flags = ILC_COLOR16;
 161     else if (image.GetDepth() <= 24)
 162         flags = ILC_COLOR24;
 163     else
 164         flags = ILC_COLOR32;
 165 #endif
 166
 167     bool mask = (image.GetMask() != 0);
 168
 169     // Curiously, even if the image doesn't have a mask,
 170     // we still have to use ILC_MASK or the image won't show
 171     // up when dragged.
 172 //    if ( mask )
 173     flags |= ILC_MASK;
 174
 175     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 176
 177     int index;
 178     if (!mask)
 179     {
 180         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 181         index = ImageList_Add(GetHimageList(), hBitmap1, 0);
 182     }
 183     else
 184     {
 185         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 186         HBITMAP hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
 187         HBITMAP hbmpMask = wxInvertMask(hBitmap2);
 188
 189         index = ImageList_Add(GetHimageList(), hBitmap1, hbmpMask);
 190         ::DeleteObject(hbmpMask);
 191     }
 192     if ( index == -1 )
 193     {
 194         wxLogError(_("Couldn't add an image to the image list."));
 195     }
 196     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 197
 198     return (index != -1) ;
 199 }
 200
 201 // Create a drag image from an icon and optional cursor
 202 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor)
 203 {
 204     if ( m_hImageList )
 205         ImageList_Destroy(GetHimageList());
 206     m_hImageList = 0;
 207
 208 #ifdef __WXWINCE__
 209     UINT flags = ILC_COLOR;
 210 #else
 211     UINT flags wxDUMMY_INITIALIZE(0) ;
 212     if (image.GetDepth() <= 4)
 213         flags = ILC_COLOR4;
 214     else if (image.GetDepth() <= 8)
 215         flags = ILC_COLOR8;
 216     else if (image.GetDepth() <= 16)
 217         flags = ILC_COLOR16;
 218     else if (image.GetDepth() <= 24)
 219         flags = ILC_COLOR24;
 220     else
 221         flags = ILC_COLOR32;
 222 #endif
 223
 224     flags |= ILC_MASK;
 225
 226     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 227
 228     HICON hIcon = (HICON) image.GetHICON();
 229
 230     int index = ImageList_AddIcon(GetHimageList(), hIcon);
 231     if ( index == -1 )
 232     {
 233         wxLogError(_("Couldn't add an image to the image list."));
 234     }
 235
 236     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 237
 238     return (index != -1) ;
 239 }
 240
 241 // Create a drag image from a string and optional cursor
 242 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor)
 243 {
 244     wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 245
 246     wxCoord w = 0, h = 0;
 247     wxScreenDC dc;
 248     dc.SetFont(font);
 249     dc.GetTextExtent(str, & w, & h);
 250     dc.SetFont(wxNullFont);
 251
 252     wxMemoryDC dc2;
 253     dc2.SetFont(font);
 254     wxBitmap bitmap((int) w+2, (int) h+2);
 255     dc2.SelectObject(bitmap);
 256
 257     dc2.SetBackground(* wxWHITE_BRUSH);
 258     dc2.Clear();
 259     dc2.SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
 260     dc2.SetTextForeground(* wxLIGHT_GREY);
 261     dc2.DrawText(str, 0, 0);
 262     dc2.DrawText(str, 1, 0);
 263     dc2.DrawText(str, 2, 0);
 264     dc2.DrawText(str, 1, 1);
 265     dc2.DrawText(str, 2, 1);
 266     dc2.DrawText(str, 1, 2);
 267     dc2.DrawText(str, 2, 2);
 268     dc2.SetTextForeground(* wxBLACK);
 269     dc2.DrawText(str, 1, 1);
 270
 271     dc2.SelectObject(wxNullBitmap);
 272
 273 #if wxUSE_WXDIB
 274     // Make the bitmap masked
 275     wxImage image = bitmap.ConvertToImage();
 276     image.SetMaskColour(255, 255, 255);
 277     return Create(wxBitmap(image), cursor);
 278 #else
 279     return false;
 280 #endif
 281 }
 282
 283 #if wxUSE_TREECTRL
 284 // Create a drag image for the given tree control item
 285 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 286 {
 287     if ( m_hImageList )
 288         ImageList_Destroy(GetHimageList());
 289     m_hImageList = (WXHIMAGELIST)
 290         TreeView_CreateDragImage(GetHwndOf(&treeCtrl), (HTREEITEM) id.m_pItem);
 291     if ( !m_hImageList )
 292     {
 293         // fall back on just the item text if there is no image
 294         return Create(treeCtrl.GetItemText(id));
 295     }
 296
 297     return true;
 298 }
 299 #endif
 300
 301 #if wxUSE_LISTCTRL
 302 // Create a drag image for the given list control item
 303 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 304 {
 305     if ( m_hImageList )
 306         ImageList_Destroy(GetHimageList());
 307     POINT pt;
 308     pt.x =
 309     pt.y = 0;
 310     m_hImageList = (WXHIMAGELIST)
 311         ListView_CreateDragImage(GetHwndOf(&listCtrl), id, &pt);
 312
 313     if ( !m_hImageList )
 314     {
 315         // as for wxTreeCtrl, fall back on dragging just the item text
 316         return Create(listCtrl.GetItemText(id));
 317     }
 318
 319     return true;
 320 }
 321 #endif
 322
 323 // Begin drag
 324 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen, wxRect* rect)
 325 {
 326     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 327     wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
 328
 329     m_fullScreen = fullScreen;
 330     if (rect)
 331         m_boundingRect = * rect;
 332
 333     bool ret = (ImageList_BeginDrag(GetHimageList(), 0, hotspot.x, hotspot.y) != 0);
 334
 335     if (!ret)
 336     {
 337         wxFAIL_MSG( wxT("BeginDrag failed.") );
 338
 339         return false;
 340     }
 341
 342     if (m_cursor.IsOk())
 343     {
 344 #if wxUSE_SIMPLER_DRAGIMAGE
 345         m_oldCursor = window->GetCursor();
 346         window->SetCursor(m_cursor);
 347 #else
 348         if (!m_hCursorImageList)
 349         {
 350 #ifndef SM_CXCURSOR
 351             // Smartphone may not have these metric symbol
 352             int cxCursor = 16;
 353             int cyCursor = 16;
 354 #else
 355             int cxCursor = ::GetSystemMetrics(SM_CXCURSOR);
 356             int cyCursor = ::GetSystemMetrics(SM_CYCURSOR);
 357 #endif
 358             m_hCursorImageList = (WXHIMAGELIST) ImageList_Create(cxCursor, cyCursor, ILC_MASK, 1, 1);
 359         }
 360
 361         // See if we can find the cursor hotspot
 362         wxPoint curHotSpot(hotspot);
 363
 364         // Although it seems to produce the right position, when the hotspot goeos
 365         // negative it has strange effects on the image.
 366         // How do we stop the cursor jumping right and below of where it should be?
 367 #if 0
 368         ICONINFO iconInfo;
 369         if (::GetIconInfo((HICON) (HCURSOR) m_cursor.GetHCURSOR(), & iconInfo) != 0)
 370         {
 371             curHotSpot.x -= iconInfo.xHotspot;
 372             curHotSpot.y -= iconInfo.yHotspot;
 373         }
 374 #endif
 375         //wxString msg;
 376         //msg.Printf("Hotspot = %d, %d", curHotSpot.x, curHotSpot.y);
 377         //wxLogDebug(msg);
 378
 379         // First add the cursor to the image list
 380         HCURSOR hCursor = (HCURSOR) m_cursor.GetHCURSOR();
 381         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hCursorImageList, (HICON) hCursor);
 382
 383         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 384
 385         if (cursorIndex != -1)
 386         {
 387             ImageList_SetDragCursorImage((HIMAGELIST) m_hCursorImageList, cursorIndex, curHotSpot.x, curHotSpot.y);
 388         }
 389 #endif
 390     }
 391
 392 #if !wxUSE_SIMPLER_DRAGIMAGE
 393     if (m_cursor.IsOk())
 394         ::ShowCursor(FALSE);
 395 #endif
 396
 397     m_window = window;
 398
 399     ::SetCapture(GetHwndOf(window));
 400
 401     return true;
 402 }
 403
 404 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 405 // corner of the image. This is full screen only. fullScreenRect gives the
 406 // position of the window on the screen, to restrict the drag to.
 407 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 408 {
 409     wxRect rect;
 410
 411     int x = fullScreenRect->GetPosition().x;
 412     int y = fullScreenRect->GetPosition().y;
 413
 414     wxSize sz = fullScreenRect->GetSize();
 415
 416     if (fullScreenRect->GetParent() && !wxDynamicCast(fullScreenRect, wxFrame))
 417         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 418
 419     rect.x = x; rect.y = y;
 420     rect.width = sz.x; rect.height = sz.y;
 421
 422     return BeginDrag(hotspot, window, true, & rect);
 423 }
 424
 425 // End drag
 426 bool wxDragImage::EndDrag()
 427 {
 428     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 429
 430     ImageList_EndDrag();
 431
 432     if ( !::ReleaseCapture() )
 433     {
 434         wxLogLastError(wxT("ReleaseCapture"));
 435     }
 436
 437 #if wxUSE_SIMPLER_DRAGIMAGE
 438     if (m_cursor.IsOk() && m_oldCursor.IsOk())
 439         m_window->SetCursor(m_oldCursor);
 440 #else
 441     ::ShowCursor(TRUE);
 442 #endif
 443
 444     m_window = NULL;
 445
 446     return true;
 447 }
 448
 449 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 450 // is non-NULL, or in screen coordinates if NULL.
 451 bool wxDragImage::Move(const wxPoint& pt)
 452 {
 453     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 454
 455     // These are in window, not client coordinates.
 456     // So need to convert to client coordinates.
 457     wxPoint pt2(pt);
 458     if (m_window && !m_fullScreen)
 459     {
 460         RECT rect;
 461         rect.left = 0; rect.top = 0;
 462         rect.right = 0; rect.bottom = 0;
 463         DWORD style = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_STYLE);
 464 #ifdef __WIN32__
 465         DWORD exStyle = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_EXSTYLE);
 466         ::AdjustWindowRectEx(& rect, style, FALSE, exStyle);
 467 #else
 468         ::AdjustWindowRect(& rect, style, FALSE);
 469 #endif
 470         // Subtract the (negative) values, i.e. add a small increment
 471         pt2.x -= rect.left; pt2.y -= rect.top;
 472     }
 473     else if (m_window && m_fullScreen)
 474     {
 475         pt2 = m_window->ClientToScreen(pt2);
 476     }
 477
 478     bool ret = (ImageList_DragMove( pt2.x, pt2.y ) != 0);
 479
 480     m_position = pt2;
 481
 482     return ret;
 483 }
 484
 485 bool wxDragImage::Show()
 486 {
 487     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 488
 489     HWND hWnd = 0;
 490     if (m_window && !m_fullScreen)
 491         hWnd = (HWND) m_window->GetHWND();
 492
 493     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 494
 495     return ret;
 496 }
 497
 498 bool wxDragImage::Hide()
 499 {
 500     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 501
 502     HWND hWnd = 0;
 503     if (m_window && !m_fullScreen)
 504         hWnd = (HWND) m_window->GetHWND();
 505
 506     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 507
 508     return ret;
 509 }
 510
 511 #endif // wxUSE_DRAGIMAGE