src/lib/ecore_win32/ecore_win32_dnd.c

   1 /*
   2  * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
   3  */
   4
   5 #ifdef HAVE_CONFIG_H
   6 # include <config.h>
   7 #endif
   8
   9 #include <windows.h>
  10
  11 #include "Ecore_Win32.h"
  12 #include "ecore_win32_private.h"
  13
  14
  15 static int _ecore_win32_dnd_init_count = 0;
  16
  17 static HANDLE DataToHandle(const char *data, int size)
  18 {
  19    char *ptr;
  20    ptr = (char *)GlobalAlloc(GMEM_FIXED, size);
  21    memcpy(ptr, data, size);
  22    return ptr;
  23 }
  24
  25
  26 int
  27 ecore_win32_dnd_init()
  28 {
  29    if (_ecore_win32_dnd_init_count > 0)
  30      {
  31         _ecore_win32_dnd_init_count++;
  32         return _ecore_win32_dnd_init_count;
  33      }
  34
  35    if (OleInitialize(NULL) != S_OK)
  36      return 0;
  37
  38    _ecore_win32_dnd_init_count++;
  39
  40    return _ecore_win32_dnd_init_count;
  41 }
  42
  43 int ecore_win32_dnd_shutdown()
  44 {
  45    _ecore_win32_dnd_init_count--;
  46    if (_ecore_win32_dnd_init_count > 0) return _ecore_win32_dnd_init_count;
  47
  48    OleUninitialize();
  49
  50    if (_ecore_win32_dnd_init_count < 0) _ecore_win32_dnd_init_count = 0;
  51
  52    return _ecore_win32_dnd_init_count;
  53 }
  54
  55 int ecore_win32_dnd_begin(const char *data,
  56                           int         size)
  57 {
  58    IDataObject *pDataObject = NULL;
  59    IDropSource *pDropSource = NULL;
  60    FORMATETC fmtetc = { CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
  61    STGMEDIUM stgmed = { TYMED_HGLOBAL, { 0 }, 0 };
  62    int res = 0;
  63
  64    if (data == NULL)
  65       return 0;
  66    if (size < 0)
  67       size = strlen(data) + 1;
  68
  69    stgmed.hGlobal = DataToHandle(data, size);
  70
  71    // create the data object
  72    pDataObject = (IDataObject *)_ecore_win32_dnd_data_object_new((void *)&fmtetc,
  73                                                                  (void *)&stgmed,
  74                                                                  1);
  75    pDropSource = (IDropSource *)_ecore_win32_dnd_drop_source_new();
  76
  77    if (pDataObject && pDropSource)
  78    {
  79       DWORD dwResult;
  80       DWORD dwEffect = DROPEFFECT_COPY;
  81
  82       // do the drag-drop!
  83       dwResult = DoDragDrop(pDataObject, pDropSource, DROPEFFECT_COPY, &dwEffect);
  84
  85       // finished. Check the return values to see if we need to do anything else
  86       if (dwResult == DRAGDROP_S_DROP)
  87       {
  88          //printf(">>> \"%s\" Dropped <<<\n", str);
  89          if(dwEffect == DROPEFFECT_MOVE)
  90          {
  91             // remove the data we just dropped from active document
  92          }
  93       }
  94       //else if (dwResult == DRAGDROP_S_CANCEL)
  95       //   printf("DND cancelled\n");
  96       //else
  97       //   printf("DND error\n");
  98
  99       res = 1;
 100    }
 101
 102    _ecore_win32_dnd_data_object_free(pDataObject);
 103    _ecore_win32_dnd_drop_source_free(pDropSource);
 104
 105    // cleanup
 106    ReleaseStgMedium(&stgmed);
 107    return (int)res;
 108 }
 109
 110 int ecore_win32_dnd_register_drop_target(Ecore_Win32_Window                 *window,
 111                                          Ecore_Win32_Dnd_DropTarget_Callback callback)
 112 {
 113    struct _Ecore_Win32_Window *wnd = (struct _Ecore_Win32_Window *)window;
 114
 115    if (window == NULL)
 116       return 0;
 117
 118    wnd->dnd_drop_target = _ecore_win32_dnd_register_drop_window(wnd->window,
 119                                                                 callback,
 120                                                                 (void *)wnd);
 121    return (int)(wnd->dnd_drop_target != NULL);
 122 }
 123
 124 void ecore_win32_dnd_unregister_drop_target(Ecore_Win32_Window *window)
 125 {
 126    struct _Ecore_Win32_Window *wnd = (struct _Ecore_Win32_Window *)window;
 127
 128    if (window == NULL)
 129       return;
 130
 131    if (wnd->dnd_drop_target != NULL)
 132       _ecore_win32_dnd_unregister_drop_window(wnd->window, wnd->dnd_drop_target);
 133 }