src/lib/ecore_win32/ecore_win32_dnd.c

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