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
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_DRAGIMAGE
  32
  33 #if defined(__WIN95__)
  34
  35 #ifndef WX_PRECOMP
  36 #include <stdio.h>
  37 #include "wx/setup.h"
  38 #include "wx/window.h"
  39 #include "wx/dcclient.h"
  40 #include "wx/dcscreen.h"
  41 #include "wx/dcmemory.h"
  42 #include "wx/settings.h"
  43 #endif
  44
  45 #include "wx/msw/private.h"
  46 #include "wx/log.h"
  47 #include "wx/intl.h"
  48 #include "wx/frame.h"
  49 #include "wx/image.h"
  50
  51 #include "wx/msw/dragimag.h"
  52 #include "wx/msw/private.h"
  53
  54 #if defined(__WIN95__) && !((defined(__GNUWIN32_OLD__) || defined(__TWIN32__)) && !defined(__CYGWIN10__))
  55 #include <commctrl.h>
  56 #endif
  57
  58 // Wine doesn't have this yet
  59 #ifndef ListView_CreateDragImage
  60 #define ListView_CreateDragImage(hwnd, i, lpptUpLeft) \
  61     (HIMAGELIST)SNDMSG((hwnd), LVM_CREATEDRAGIMAGE, (WPARAM)(int)(i), (LPARAM)(LPPOINT)(lpptUpLeft))
  62 #endif
  63
  64 // ----------------------------------------------------------------------------
  65 // macros
  66 // ----------------------------------------------------------------------------
  67
  68 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  69
  70 #define GetHimageList() ((HIMAGELIST) m_hImageList)
  71
  72 // ============================================================================
  73 // implementation
  74 // ============================================================================
  75
  76 // ----------------------------------------------------------------------------
  77 // wxDragImage ctors/dtor
  78 // ----------------------------------------------------------------------------
  79
  80 wxDragImage::wxDragImage()
  81 {
  82     Init();
  83 }
  84
  85 wxDragImage::~wxDragImage()
  86 {
  87     if ( m_hImageList )
  88         ImageList_Destroy(GetHimageList());
  89 #if !wxUSE_SIMPLER_DRAGIMAGE
  90     if ( m_hCursorImageList )
  91         ImageList_Destroy((HIMAGELIST) m_hCursorImageList);
  92 #endif
  93 }
  94
  95 void wxDragImage::Init()
  96 {
  97     m_hImageList = 0;
  98 #if !wxUSE_SIMPLER_DRAGIMAGE
  99     m_hCursorImageList = 0;
 100 #endif
 101     m_window = (wxWindow*) NULL;
 102     m_fullScreen = FALSE;
 103 }
 104
 105 // Attributes
 106 ////////////////////////////////////////////////////////////////////////////
 107
 108
 109 // Operations
 110 ////////////////////////////////////////////////////////////////////////////
 111
 112 // Create a drag image from a bitmap and optional cursor
 113 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
 114 {
 115     if ( m_hImageList )
 116         ImageList_Destroy(GetHimageList());
 117     m_hImageList = 0;
 118
 119     UINT flags = 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
 131     bool mask = (image.GetMask() != 0);
 132     if ( mask )
 133         flags |= ILC_MASK;
 134
 135     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 136
 137     int index;
 138     if (!mask)
 139     {
 140         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 141         index = ImageList_Add(GetHimageList(), hBitmap1, 0);
 142     }
 143     else
 144     {
 145         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 146         HBITMAP hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
 147         HBITMAP hbmpMask = wxInvertMask(hBitmap2);
 148
 149         index = ImageList_Add(GetHimageList(), hBitmap1, hbmpMask);
 150         ::DeleteObject(hbmpMask);
 151     }
 152     if ( index == -1 )
 153     {
 154         wxLogError(_("Couldn't add an image to the image list."));
 155     }
 156     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 157
 158     return (index != -1) ;
 159 }
 160
 161 // Create a drag image from an icon and optional cursor
 162 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor)
 163 {
 164     if ( m_hImageList )
 165         ImageList_Destroy(GetHimageList());
 166     m_hImageList = 0;
 167
 168     UINT flags = 0 ;
 169     if (image.GetDepth() <= 4)
 170         flags = ILC_COLOR4;
 171     else if (image.GetDepth() <= 8)
 172         flags = ILC_COLOR8;
 173     else if (image.GetDepth() <= 16)
 174         flags = ILC_COLOR16;
 175     else if (image.GetDepth() <= 24)
 176         flags = ILC_COLOR24;
 177     else
 178         flags = ILC_COLOR32;
 179     bool mask = TRUE;
 180     if ( mask )
 181         flags |= ILC_MASK;
 182
 183     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 184
 185     HICON hIcon = (HICON) image.GetHICON();
 186
 187     int index = ImageList_AddIcon(GetHimageList(), hIcon);
 188     if ( index == -1 )
 189     {
 190         wxLogError(_("Couldn't add an image to the image list."));
 191     }
 192
 193     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 194
 195     return (index != -1) ;
 196 }
 197
 198 // Create a drag image from a string and optional cursor
 199 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor)
 200 {
 201     wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 202
 203     long w, h;
 204     wxScreenDC dc;
 205     dc.SetFont(font);
 206     dc.GetTextExtent(str, & w, & h);
 207     dc.SetFont(wxNullFont);
 208
 209     wxMemoryDC dc2;
 210     dc2.SetFont(font);
 211     wxBitmap bitmap((int) w+2, (int) h+2);
 212     dc2.SelectObject(bitmap);
 213
 214     dc2.SetBackground(* wxWHITE_BRUSH);
 215     dc2.Clear();
 216     dc2.SetBackgroundMode(wxTRANSPARENT);
 217     dc2.SetTextForeground(* wxLIGHT_GREY);
 218     dc2.DrawText(str, 0, 0);
 219     dc2.DrawText(str, 1, 0);
 220     dc2.DrawText(str, 2, 0);
 221     dc2.DrawText(str, 1, 1);
 222     dc2.DrawText(str, 2, 1);
 223     dc2.DrawText(str, 1, 2);
 224     dc2.DrawText(str, 2, 2);
 225     dc2.SetTextForeground(* wxBLACK);
 226     dc2.DrawText(str, 1, 1);
 227
 228     dc2.SelectObject(wxNullBitmap);
 229
 230     // Make the bitmap masked
 231     wxImage image = bitmap.ConvertToImage();
 232     image.SetMaskColour(255, 255, 255);
 233     return Create(wxBitmap(image), cursor);
 234 }
 235
 236 // Create a drag image for the given tree control item
 237 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 238 {
 239     if ( m_hImageList )
 240         ImageList_Destroy(GetHimageList());
 241     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 242     return TRUE;
 243 }
 244
 245 // Create a drag image for the given list control item
 246 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 247 {
 248     if ( m_hImageList )
 249         ImageList_Destroy(GetHimageList());
 250     POINT pt;
 251     pt.x = 0; pt.y = 0;
 252     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 253     return TRUE;
 254 }
 255
 256 // Begin drag
 257 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen, wxRect* rect)
 258 {
 259     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 260     wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
 261
 262     m_fullScreen = fullScreen;
 263     if (rect)
 264         m_boundingRect = * rect;
 265
 266     bool ret = (ImageList_BeginDrag(GetHimageList(), 0, hotspot.x, hotspot.y) != 0);
 267
 268     if (!ret)
 269     {
 270         wxFAIL_MSG( _T("BeginDrag failed.") );
 271
 272         return FALSE;
 273     }
 274
 275     if (m_cursor.Ok())
 276     {
 277 #if wxUSE_SIMPLER_DRAGIMAGE
 278             m_oldCursor = window->GetCursor();
 279             window->SetCursor(m_cursor);
 280 #else
 281         if (!m_hCursorImageList)
 282         {
 283             int cxCursor = GetSystemMetrics(SM_CXCURSOR);
 284             int cyCursor = GetSystemMetrics(SM_CYCURSOR);
 285
 286             m_hCursorImageList = (WXHIMAGELIST) ImageList_Create(cxCursor, cyCursor, ILC_MASK, 1, 1);
 287         }
 288
 289         // See if we can find the cursor hotspot
 290         wxPoint curHotSpot(hotspot);
 291
 292         // Although it seems to produce the right position, when the hotspot goeos
 293         // negative it has strange effects on the image.
 294         // How do we stop the cursor jumping right and below of where it should be?
 295 #if 0
 296         ICONINFO iconInfo;
 297         if (::GetIconInfo((HICON) (HCURSOR) m_cursor.GetHCURSOR(), & iconInfo) != 0)
 298         {
 299             curHotSpot.x -= iconInfo.xHotspot;
 300             curHotSpot.y -= iconInfo.yHotspot;
 301         }
 302 #endif
 303         //wxString msg;
 304         //msg.Printf("Hotspot = %d, %d", curHotSpot.x, curHotSpot.y);
 305         //wxLogDebug(msg);
 306
 307         // First add the cursor to the image list
 308         HCURSOR hCursor = (HCURSOR) m_cursor.GetHCURSOR();
 309         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hCursorImageList, (HICON) hCursor);
 310
 311         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 312
 313         if (cursorIndex != -1)
 314         {
 315             ImageList_SetDragCursorImage((HIMAGELIST) m_hCursorImageList, cursorIndex, curHotSpot.x, curHotSpot.y);
 316         }
 317 #endif
 318     }
 319
 320 #if !wxUSE_SIMPLER_DRAGIMAGE
 321     if (m_cursor.Ok())
 322         ::ShowCursor(FALSE);
 323 #endif
 324
 325     m_window = window;
 326
 327     ::SetCapture(GetHwndOf(window));
 328
 329     return TRUE;
 330 }
 331
 332 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 333 // corner of the image. This is full screen only. fullScreenRect gives the
 334 // position of the window on the screen, to restrict the drag to.
 335 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 336 {
 337     wxRect rect;
 338
 339     int x = fullScreenRect->GetPosition().x;
 340     int y = fullScreenRect->GetPosition().y;
 341
 342     wxSize sz = fullScreenRect->GetSize();
 343
 344     if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
 345         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 346
 347     rect.x = x; rect.y = y;
 348     rect.width = sz.x; rect.height = sz.y;
 349
 350     return BeginDrag(hotspot, window, TRUE, & rect);
 351 }
 352
 353 // End drag
 354 bool wxDragImage::EndDrag()
 355 {
 356     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 357
 358     ImageList_EndDrag();
 359
 360     if ( !::ReleaseCapture() )
 361     {
 362         wxLogLastError(wxT("ReleaseCapture"));
 363     }
 364
 365 #if wxUSE_SIMPLER_DRAGIMAGE
 366     if (m_cursor.Ok() && m_oldCursor.Ok())
 367             m_window->SetCursor(m_oldCursor);
 368 #else
 369     ::ShowCursor(TRUE);
 370 #endif
 371
 372     m_window = (wxWindow*) NULL;
 373
 374     return TRUE;
 375 }
 376
 377 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 378 // is non-NULL, or in screen coordinates if NULL.
 379 bool wxDragImage::Move(const wxPoint& pt)
 380 {
 381     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 382
 383     // These are in window, not client coordinates.
 384     // So need to convert to client coordinates.
 385     wxPoint pt2(pt);
 386     if (m_window && !m_fullScreen)
 387     {
 388         RECT rect;
 389         rect.left = 0; rect.top = 0;
 390         rect.right = 0; rect.bottom = 0;
 391         DWORD style = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_STYLE);
 392 #ifdef __WIN32__
 393         DWORD exStyle = ::GetWindowLong((HWND) m_window->GetHWND(), GWL_EXSTYLE);
 394         ::AdjustWindowRectEx(& rect, style, FALSE, exStyle);
 395 #else
 396         ::AdjustWindowRect(& rect, style, FALSE);
 397 #endif
 398         // Subtract the (negative) values, i.e. add a small increment
 399         pt2.x -= rect.left; pt2.y -= rect.top;
 400     }
 401     else if (m_window && m_fullScreen)
 402     {
 403         pt2 = m_window->ClientToScreen(pt2);
 404     }
 405
 406     bool ret = (ImageList_DragMove( pt2.x, pt2.y ) != 0);
 407
 408     m_position = pt2;
 409
 410     return ret;
 411 }
 412
 413 bool wxDragImage::Show()
 414 {
 415     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 416
 417     HWND hWnd = 0;
 418     if (m_window && !m_fullScreen)
 419         hWnd = (HWND) m_window->GetHWND();
 420
 421     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 422
 423     return ret;
 424 }
 425
 426 bool wxDragImage::Hide()
 427 {
 428     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 429
 430     HWND hWnd = 0;
 431     if (m_window && !m_fullScreen)
 432         hWnd = (HWND) m_window->GetHWND();
 433
 434     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 435
 436     return ret;
 437 }
 438
 439 #endif
 440     // __WIN95__
 441
 442 #endif // wxUSE_DRAGIMAGE