+///////////////////////////////////////////////////////////////////////////////
+// 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) wxWidgets Team
+// Licence: wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DND_H_BASE_
+#define _WX_DND_H_BASE_
+
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+ #pragma interface "dndbase.h"
+#endif
+
+#include "wx/defs.h"
+
+#if wxUSE_DRAG_AND_DROP
+
+#include "wx/dataobj.h"
+#include "wx/cursor.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// flags for wxDropSource::DoDragDrop()
+//
+// NB: wxDrag_CopyOnly must be 0 (== FALSE) and wxDrag_AllowMove must be 1
+// (== TRUE) for compatibility with the old DoDragDrop(bool) method!
+enum
+{
+ wxDrag_CopyOnly = 0, // allow only copying
+ wxDrag_AllowMove = 1, // allow moving (copying is always allowed)
+ wxDrag_DefaultMove = 3 // the default operation is move, not copy
+};
+
+// 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)
+ wxDragLink, // operation is a drag-link
+ wxDragCancel // the operation was cancelled by user (not an error)
+};
+
+inline WXDLLEXPORT bool wxIsDragResultOk(wxDragResult res)
+{
+ return res == wxDragCopy || res == wxDragMove || res == wxDragLink;
+}
+
+// ----------------------------------------------------------------------------
+// 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(const wxCursor &cursorCopy = wxNullCursor,
+ const wxCursor &cursorMove = wxNullCursor,
+ const wxCursor &cursorStop = wxNullCursor)
+ : m_cursorCopy(cursorCopy),
+ m_cursorMove(cursorMove),
+ m_cursorStop(cursorStop)
+ { 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; }
+
+ // set the icon corresponding to given drag result
+ void SetCursor(wxDragResult res, const wxCursor& cursor)
+ {
+ if ( res == wxDragCopy )
+ m_cursorCopy = cursor;
+ else if ( res == wxDragMove )
+ m_cursorMove = cursor;
+ else
+ m_cursorStop = cursor;
+ }
+
+ // start drag action, see enum wxDragResult for return value description
+ //
+ // if flags contains wxDrag_AllowMove, moving (and only copying) data is
+ // allowed, if it contains wxDrag_DefaultMove (which includes the previous
+ // flag), it is even the default operation
+ virtual wxDragResult DoDragDrop(int flags = wxDrag_CopyOnly) = 0;
+
+ // override to give feedback depending on the current operation result
+ // "effect" and return TRUE if you did something, FALSE to let the library
+ // give the default feedback
+ virtual bool GiveFeedback(wxDragResult WXUNUSED(effect)) { return FALSE; }
+
+protected:
+ const wxCursor& GetCursor(wxDragResult res) const
+ {
+ if ( res == wxDragCopy )
+ return m_cursorCopy;
+ else if ( res == wxDragMove )
+ return m_cursorMove;
+ else
+ return m_cursorStop;
+ }
+
+ // the data we're dragging
+ wxDataObject *m_data;
+
+ // the cursors to use for feedback
+ wxCursor m_cursorCopy,
+ m_cursorMove,
+ m_cursorStop;
+
+ DECLARE_NO_COPY_CLASS(wxDropSourceBase)
+};
+
+// ----------------------------------------------------------------------------
+// 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 and, finally, return the code indicating how did the operation
+ // complete (returning default value in case of success and wxDragError on
+ // failure is usually ok)
+ virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def) = 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;
+
+ DECLARE_NO_COPY_CLASS(wxDropTargetBase)
+};
+
+// ----------------------------------------------------------------------------
+// include platform dependent class declarations
+// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff