avoiding crash for pure modifier events

[wxWidgets.git] / include / wx / dnd.h

diff --git a/include/wx/dnd.h b/include/wx/dnd.h
index 17ae097d0caa681166e28778ca5abcb0c867a131..d1cde3e9cd61ba90af3f3c1a77f1d6d11d72644e 100644 (file)
--- a/include/wx/dnd.h
+++ b/include/wx/dnd.h
@@ -5,8 +5,8 @@
 // Modified by:
 // Created:     26.05.99
 // RCS-ID:      $Id$
 // Modified by:
 // Created:     26.05.99
 // RCS-ID:      $Id$

-// Copyright:   (c) wxWindows Team
-// Licence:     wxWindows license
+// Copyright:   (c) wxWidgets Team
+// Licence:     wxWindows licence

 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef _WX_DND_H_BASE_
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef _WX_DND_H_BASE_


@@ -17,11 +17,23 @@
 #if wxUSE_DRAG_AND_DROP
 
 #include "wx/dataobj.h"
 #if wxUSE_DRAG_AND_DROP
 
 #include "wx/dataobj.h"

+#include "wx/cursor.h"

 
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // 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
 {
 // result of wxDropSource::DoDragDrop() call
 enum wxDragResult
 {


@@ -29,18 +41,29 @@ enum wxDragResult
     wxDragNone,     // drag target didn't accept the data
     wxDragCopy,     // the data was successfully copied
     wxDragMove,     // the data was successfully moved (MSW only)
     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)
 };
 
     wxDragCancel    // the operation was cancelled by user (not an error)
 };
 

+// return true if res indicates that something was done during a dnd operation,
+// i.e. is neither error nor none nor cancel
+WXDLLIMPEXP_CORE bool wxIsDragResultOk(wxDragResult res);
+

 // ----------------------------------------------------------------------------
 // wxDropSource is the object you need to create (and call DoDragDrop on it)
 // to initiate a drag-and-drop operation
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // wxDropSource is the object you need to create (and call DoDragDrop on it)
 // to initiate a drag-and-drop operation
 // ----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxDropSourceBase
+class WXDLLIMPEXP_CORE wxDropSourceBase

 {
 public:
 {
 public:

-    wxDropSourceBase() { m_data = (wxDataObject *)NULL; }
+    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
     virtual ~wxDropSourceBase() { }
 
     // set the data which is transfered by drag and drop


@@ -50,21 +73,49 @@ public:
     wxDataObject *GetDataObject()
       { return m_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
     //
     // 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;
+    // 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
 
     // override to give feedback depending on the current operation result

-    // "effect"
-    virtual bool GiveFeedback( wxDragResult WXUNUSED(effect),
-                               bool WXUNUSED(bScrolling) )
+    // "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

     {
     {

-        return TRUE;
+        if ( res == wxDragCopy )
+            return m_cursorCopy;
+        else if ( res == wxDragMove )
+            return m_cursorMove;
+        else
+            return m_cursorStop;

     }
 
     }
 

-protected:
+    // the data we're dragging

     wxDataObject *m_data;
     wxDataObject *m_data;

+
+    // the cursors to use for feedback
+    wxCursor m_cursorCopy,
+             m_cursorMove,
+             m_cursorStop;
+
+    DECLARE_NO_COPY_CLASS(wxDropSourceBase)

 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------


@@ -78,14 +129,14 @@ protected:
 // OnData() is called)
 // ----------------------------------------------------------------------------
 
 // OnData() is called)
 // ----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxDropTargetBase
+class WXDLLIMPEXP_CORE 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)
 {
 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; }
+        { m_dataObject = dataObject; m_defaultAction = wxDragNone; }

     // dtor deletes our data object
     virtual ~wxDropTargetBase()
         { delete m_dataObject; }
     // dtor deletes our data object
     virtual ~wxDropTargetBase()
         { delete m_dataObject; }


@@ -121,27 +172,39 @@ public:
     virtual void OnLeave() { }
 
     // this function is called when data is dropped at position (x, y) - if it
     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
+    // 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
     // 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;
+    // 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
 
     // may be called *only* from inside OnData() and will fill m_dataObject

-    // with the data from the drop source if it returns TRUE
+    // with the data from the drop source if it returns true

     virtual bool GetData() = 0;
 
     virtual bool GetData() = 0;
 

+    // sets the default action for drag and drop:
+    // use wxDragMove or wxDragCopy to set deafult action to move or copy
+    // and use wxDragNone (default) to set default action specified by
+    // initialization of draging (see wxDropSourceBase::DoDragDrop())
+    void SetDefaultAction(wxDragResult action)
+        { m_defaultAction = action; }
+
+    // returns default action for drag and drop or
+    // wxDragNone if this not specified
+    wxDragResult GetDefaultAction()
+        { return m_defaultAction; }
+

 protected:
     wxDataObject *m_dataObject;
 protected:
     wxDataObject *m_dataObject;

-};
+    wxDragResult m_defaultAction;

 
 

-// ----------------------------------------------------------------------------
-// the platform-specific headers also define standard wxDropTarget
-// implementations wxTextDropTarget and wxFileDropTarget
-// ----------------------------------------------------------------------------
+    DECLARE_NO_COPY_CLASS(wxDropTargetBase)
+};

 
 // ----------------------------------------------------------------------------
 // include platform dependent class declarations
 
 // ----------------------------------------------------------------------------
 // include platform dependent class declarations


@@ -152,18 +215,53 @@ protected:
     #include "wx/msw/ole/droptgt.h"
 #elif defined(__WXMOTIF__)
     #include "wx/motif/dnd.h"
     #include "wx/msw/ole/droptgt.h"
 #elif defined(__WXMOTIF__)
     #include "wx/motif/dnd.h"

-#elif defined(__WXGTK__)
+#elif defined(__WXX11__)
+    #include "wx/x11/dnd.h"
+#elif defined(__WXGTK20__)

     #include "wx/gtk/dnd.h"
     #include "wx/gtk/dnd.h"

-#elif defined(__WXQT__)
-    #include "wx/qt/dnd.h"
+#elif defined(__WXGTK__)
+    #include "wx/gtk1/dnd.h"

 #elif defined(__WXMAC__)
 #elif defined(__WXMAC__)

-    #include "wx/mac/dnd.h"
+    #include "wx/osx/dnd.h"

 #elif defined(__WXPM__)
     #include "wx/os2/dnd.h"
 #elif defined(__WXPM__)
     #include "wx/os2/dnd.h"

-#elif defined(__WXSTUBS__)
-    #include "wx/stubs/dnd.h"

 #endif
 
 #endif
 

+// ----------------------------------------------------------------------------
+// standard wxDropTarget implementations (implemented in common/dobjcmn.cpp)
+// ----------------------------------------------------------------------------
+
+// A simple wxDropTarget derived class for text data: you only need to
+// override OnDropText() to get something working
+class WXDLLIMPEXP_CORE wxTextDropTarget : public wxDropTarget
+{
+public:
+    wxTextDropTarget();
+
+    virtual bool OnDropText(wxCoord x, wxCoord y, const wxString& text) = 0;
+
+    virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def);
+
+private:
+    DECLARE_NO_COPY_CLASS(wxTextDropTarget)
+};
+
+// A drop target which accepts files (dragged from File Manager or Explorer)
+class WXDLLIMPEXP_CORE wxFileDropTarget : public wxDropTarget
+{
+public:
+    wxFileDropTarget();
+
+    // parameters are the number of files and the array of file names
+    virtual bool OnDropFiles(wxCoord x, wxCoord y,
+                             const wxArrayString& filenames) = 0;
+
+    virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def);
+
+private:
+    DECLARE_NO_COPY_CLASS(wxFileDropTarget)
+};
+

 #endif // wxUSE_DRAG_AND_DROP
 
 #endif // _WX_DND_H_BASE_
 #endif // wxUSE_DRAG_AND_DROP
 
 #endif // _WX_DND_H_BASE_