+///////////////////////////////////////////////////////////////////////////////
+// Name: wx/dnd.h
+// Purpose: Drag and drop classes declarations
+// Author: Vadim Zeitlin, Robert Roebling
+// Modified by:
+// Created: 26.05.99
+// RCS-ID: $Id$
+// Copyright: (c) wxWindows Team
+// Licence: wxWindows license
+///////////////////////////////////////////////////////////////////////////////
+
#ifndef _WX_DND_H_BASE_
#define _WX_DND_H_BASE_
-#if defined(__WXMSW__)
+#include "wx/defs.h"
+
+#if wxUSE_DRAG_AND_DROP
+
#include "wx/dataobj.h"
-#include "wx/msw/ole/dropsrc.h"
-#include "wx/msw/ole/droptgt.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// result of wxDropSource::DoDragDrop() call
+enum wxDragResult
+{
+ wxDragError, // error prevented the d&d operation from completing
+ wxDragNone, // drag target didn't accept the data
+ wxDragCopy, // the data was successfully copied
+ wxDragMove, // the data was successfully moved (MSW only)
+ wxDragCancel // the operation was cancelled by user (not an error)
+};
+
+// ----------------------------------------------------------------------------
+// wxDropSource is the object you need to create (and call DoDragDrop on it)
+// to initiate a drag-and-drop operation
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDropSourceBase
+{
+public:
+ wxDropSourceBase() { m_data = (wxDataObject *)NULL; }
+ virtual ~wxDropSourceBase() { }
+
+ // set the data which is transfered by drag and drop
+ void SetData(wxDataObject& data)
+ { m_data = &data; }
+
+ wxDataObject *GetDataObject()
+ { return m_data; }
+
+ // start drag action, see enum wxDragResult for return value description
+ //
+ // if bAllowMove is TRUE, data can be moved, if not - only copied
+ virtual wxDragResult DoDragDrop(bool bAllowMove = FALSE) = 0;
+
+ // override to give feedback depending on the current operation result
+ // "effect"
+ virtual bool GiveFeedback( wxDragResult WXUNUSED(effect),
+ bool WXUNUSED(bScrolling) )
+ {
+ return TRUE;
+ }
+
+protected:
+ wxDataObject *m_data;
+};
+
+// ----------------------------------------------------------------------------
+// wxDropTarget should be associated with a window if it wants to be able to
+// receive data via drag and drop.
+//
+// To use this class, you should derive from wxDropTarget and implement
+// OnData() pure virtual method. You may also wish to override OnDrop() if you
+// want to accept the data only inside some region of the window (this may
+// avoid having to copy the data to this application which happens only when
+// OnData() is called)
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDropTargetBase
+{
+public:
+ // ctor takes a pointer to heap-allocated wxDataObject which will be owned
+ // by wxDropTarget and deleted by it automatically. If you don't give it
+ // here, you can use SetDataObject() later.
+ wxDropTargetBase(wxDataObject *dataObject = (wxDataObject*)NULL)
+ { m_dataObject = dataObject; }
+ // dtor deletes our data object
+ virtual ~wxDropTargetBase()
+ { delete m_dataObject; }
+
+ // get/set the associated wxDataObject
+ wxDataObject *GetDataObject() const
+ { return m_dataObject; }
+ void SetDataObject(wxDataObject *dataObject)
+ { if (m_dataObject) delete m_dataObject;
+ m_dataObject = dataObject; }
+
+ // these functions are called when data is moved over position (x, y) and
+ // may return either wxDragCopy, wxDragMove or wxDragNone depending on
+ // what would happen if the data were dropped here.
+ //
+ // the last parameter is what would happen by default and is determined by
+ // the platform-specific logic (for example, under Windows it's wxDragCopy
+ // if Ctrl key is pressed and wxDragMove otherwise) except that it will
+ // always be wxDragNone if the carried data is in an unsupported format.
+
+ // called when the mouse enters the window (only once until OnLeave())
+ virtual wxDragResult OnEnter(wxCoord x, wxCoord y, wxDragResult def)
+ { return OnDragOver(x, y, def); }
+
+ // called when the mouse moves in the window - shouldn't take long to
+ // execute or otherwise mouse movement would be too slow
+ virtual wxDragResult OnDragOver(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+ wxDragResult def)
+ { return def; }
+
+ // called when mouse leaves the window: might be used to remove the
+ // feedback which was given in OnEnter()
+ virtual void OnLeave() { }
+
+ // this function is called when data is dropped at position (x, y) - if it
+ // returns TRUE, OnData() will be called immediately afterwards which will
+ // allow to retrieve the data dropped.
+ virtual bool OnDrop(wxCoord x, wxCoord y) = 0;
+
+ // called after OnDrop() returns TRUE: you will usually just call
+ // GetData() from here and, probably, also refresh something to update the
+ // new data
+ virtual bool OnData(wxCoord x, wxCoord y) = 0;
+
+ // may be called *only* from inside OnData() and will fill m_dataObject
+ // with the data from the drop source if it returns TRUE
+ virtual bool GetData() = 0;
+
+protected:
+ wxDataObject *m_dataObject;
+};
+
+// ----------------------------------------------------------------------------
+// the platform-specific headers also define standard wxDropTarget
+// implementations wxTextDropTarget and wxFileDropTarget
+// ----------------------------------------------------------------------------
+
+// ----------------------------------------------------------------------------
+// include platform dependent class declarations
+// ----------------------------------------------------------------------------
+
+#if defined(__WXMSW__)
+ #include "wx/msw/ole/dropsrc.h"
+ #include "wx/msw/ole/droptgt.h"
#elif defined(__WXMOTIF__)
-#include "wx/motif/dnd.h"
+ #include "wx/motif/dnd.h"
#elif defined(__WXGTK__)
-#include "wx/gtk/dnd.h"
+ #include "wx/gtk/dnd.h"
#elif defined(__WXQT__)
-#include "wx/qt/dnd.h"
+ #include "wx/qt/dnd.h"
#elif defined(__WXMAC__)
-#include "wx/mac/dnd.h"
+ #include "wx/mac/dnd.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dnd.h"
#elif defined(__WXSTUBS__)
-#include "wx/stubs/dnd.h"
+ #include "wx/stubs/dnd.h"
#endif
-#endif
- // _WX_DND_H_BASE_
+#endif // wxUSE_DRAG_AND_DROP
+
+#endif // _WX_DND_H_BASE_
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