include/wx/msw/ole/dropsrc.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        ole/dropsrc.h
   3 // Purpose:     declaration of the wxDropSource class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     06.03.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _OLEDROPSRC_H
  13 #define   _OLEDROPSRC_H
  14
  15 #ifdef __GNUG__
  16 #pragma interface
  17 #endif
  18
  19 #if !USE_DRAG_AND_DROP
  20   #error  "You should #define USE_DRAG_AND_DROP to 1 to compile this file!"
  21 #endif  //WX_DRAG_DROP
  22
  23 // ----------------------------------------------------------------------------
  24 // forward declarations
  25 // ----------------------------------------------------------------------------
  26 class wxIDropSource;
  27 class wxDataObject;
  28
  29 // ----------------------------------------------------------------------------
  30 // wxDropSource is used to start the drag-&-drop operation on associated
  31 // wxDataObject object. It's responsible for giving UI feedback while dragging.
  32 // ----------------------------------------------------------------------------
  33 class wxDropSource
  34 {
  35 public:
  36   enum DragResult
  37   {
  38     Error,    // error prevented the d&d operation from completing
  39     None,     // drag target didn't accept the data
  40     Copy,     // the data was successfully copied
  41     Move,     // the data was successfully moved
  42     Cancel    // the operation was cancelled by user (not an error)
  43   };
  44
  45   // ctors: if you use default ctor you must call SetData() later!
  46   wxDropSource();
  47   wxDropSource(wxDataObject& data);
  48
  49   void SetData(wxDataObject& data);
  50
  51   virtual ~wxDropSource();
  52
  53   // do it (call this in response to a mouse button press, for example)
  54   // params: if bAllowMove is false, data can be only copied
  55   DragResult DoDragDrop(bool bAllowMove = false);
  56
  57   // overridable: you may give some custom UI feedback during d&d operation
  58   // in this function (it's called on each mouse move, so it shouldn't be too
  59   // slow). Just return false if you want default feedback.
  60   virtual bool GiveFeedback(DragResult effect, bool bScrolling);
  61
  62 protected:
  63   void Init();
  64
  65   wxDataObject  *m_pData;         // pointer to associated data object
  66
  67 private:
  68   wxIDropSource *m_pIDropSource;  // the pointer to COM interface
  69 };
  70
  71 #endif  //_OLEDROPSRC_H