fixed wxXmlResource::Load's detection of filenames to be done as early as possible

[wxWidgets.git] / samples / dnd / dnd.cpp

diff --git a/samples/dnd/dnd.cpp b/samples/dnd/dnd.cpp
index a2e20c79924e1bdb6c4e4bf6bdd76ed627f712c7..9c2651c34bf5ea12577d405241e74a271ef20622 100644 (file)
--- a/samples/dnd/dnd.cpp
+++ b/samples/dnd/dnd.cpp
@@ -19,19 +19,25 @@
 #include "wx/wx.h"
 #endif
 
 #include "wx/wx.h"
 #endif
 

-#include  "wx/intl.h"
-#include  "wx/log.h"
-
-#include  "wx/dnd.h"
-
-#ifdef __WXMOTIF__
-#error Sorry, drag and drop is not yet implemented on wxMotif.
+#include "wx/dnd.h"
+#include "wx/dataobj.h"
+#include "wx/image.h"
+#include "wx/clipbrd.h"
+#include "wx/colordlg.h"
+#include "wx/metafile.h"
+#include "wx/dirctrl.h"
+
+#if defined(__WXGTK__) || defined(__WXX11__) || defined(__WXMOTIF__) || defined(__WXMAC__)
+    #include "../sample.xpm"
+#if wxUSE_DRAG_AND_DROP
+    #include "dnd_copy.xpm"
+    #include "dnd_move.xpm"
+    #include "dnd_none.xpm"

 #endif
 #endif

-
-#if defined(__WXGTK__) || defined(__WXMOTIF__)
-#include "mondrian.xpm"

 #endif
 
 #endif
 

+#if wxUSE_DRAG_AND_DROP
+

 // ----------------------------------------------------------------------------
 // Derive two simple classes which just put in the listbox the strings (text or
 // file names) we drop on them
 // ----------------------------------------------------------------------------
 // Derive two simple classes which just put in the listbox the strings (text or
 // file names) we drop on them


@@ -40,26 +46,64 @@
 class DnDText : public wxTextDropTarget
 {
 public:
 class DnDText : public wxTextDropTarget
 {
 public:

-  DnDText(wxListBox *pOwner) { m_pOwner = pOwner; }
+    DnDText(wxListBox *pOwner) { m_pOwner = pOwner; }

 
 

-  virtual bool OnDropText(long x, long y, const char *psz );
+    virtual bool OnDropText(wxCoord x, wxCoord y, const wxString& text);

 
 private:
 
 private:

-  wxListBox *m_pOwner;
+    wxListBox *m_pOwner;

 };
 
 class DnDFile : public wxFileDropTarget
 {
 public:
 };
 
 class DnDFile : public wxFileDropTarget
 {
 public:

-  DnDFile(wxListBox *pOwner) { m_pOwner = pOwner; }
+    DnDFile(wxListBox *pOwner = NULL) { m_pOwner = pOwner; }

 
 

-  virtual bool OnDropFiles(long x, long y,
-                           size_t nFiles, const char * const aszFiles[] );
+    virtual bool OnDropFiles(wxCoord x, wxCoord y,
+                             const wxArrayString& filenames);

 
 private:
 
 private:

-  wxListBox *m_pOwner;
+    wxListBox *m_pOwner;
+};
+
+// ----------------------------------------------------------------------------
+// Define a custom dtop target accepting URLs
+// ----------------------------------------------------------------------------
+
+class URLDropTarget : public wxDropTarget
+{
+public:
+    URLDropTarget() { SetDataObject(new wxURLDataObject); }
+
+    void OnDropURL(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), const wxString& text)
+    {
+        // of course, a real program would do something more useful here...
+        wxMessageBox(text, _T("wxDnD sample: got URL"),
+                     wxICON_INFORMATION | wxOK);
+    }
+
+    // URLs can't be moved, only copied
+    virtual wxDragResult OnDragOver(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+                                    wxDragResult WXUNUSED(def))
+        {
+            return wxDragLink;  // At least IE 5.x needs wxDragLink, the
+                                // other browsers on MSW seem okay with it too.
+        }
+
+    // translate this to calls to OnDropURL() just for convenience
+    virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def)
+    {
+        if ( !GetData() )
+            return wxDragNone;
+
+        OnDropURL(x, y, ((wxURLDataObject *)m_dataObject)->GetURL());
+
+        return def;
+    }

 };
 
 };
 

+#endif // wxUSE_DRAG_AND_DROP
+

 // ----------------------------------------------------------------------------
 // Define a new application type
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // Define a new application type
 // ----------------------------------------------------------------------------


@@ -67,304 +111,1945 @@ private:
 class DnDApp : public wxApp
 {
 public:
 class DnDApp : public wxApp
 {
 public:

-  bool OnInit();
+    virtual bool OnInit();

 };
 
 };
 

-IMPLEMENT_APP(DnDApp);
+IMPLEMENT_APP(DnDApp)
+
+#if wxUSE_DRAG_AND_DROP || wxUSE_CLIPBOARD

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// Define a new frame type
+// Define canvas class to show a bitmap

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-class DnDFrame : public wxFrame
+
+class DnDCanvasBitmap : public wxScrolledWindow

 {
 public:
 {
 public:

-  DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
- ~DnDFrame();
+    DnDCanvasBitmap(wxWindow *parent) : wxScrolledWindow(parent) { }

 
 

-  void OnPaint(wxPaintEvent& event);
-  void OnQuit (wxCommandEvent& event);
-  void OnAbout(wxCommandEvent& event);
-  void OnDrag (wxCommandEvent& event);
-  void OnHelp (wxCommandEvent& event);
-  void OnLogClear(wxCommandEvent& event);
+    void SetBitmap(const wxBitmap& bitmap)
+    {
+        m_bitmap = bitmap;
+
+        SetScrollbars(10, 10,
+                      m_bitmap.GetWidth() / 10, m_bitmap.GetHeight() / 10);
+
+        Refresh();
+    }

 
 

-  void OnLeftDown(wxMouseEvent& event);
-  void OnRightDown(wxMouseEvent& event);
+    void OnPaint(wxPaintEvent& WXUNUSED(event))
+    {
+        wxPaintDC dc(this);
+
+        if ( m_bitmap.Ok() )
+        {
+            PrepareDC(dc);

 
 

-  DECLARE_EVENT_TABLE()
+            dc.DrawBitmap(m_bitmap, 0, 0);
+        }
+    }

 
 private:
 
 private:

-  wxListBox  *m_ctrlFile,
-             *m_ctrlText;
-  wxTextCtrl *m_ctrlLog;
+    wxBitmap m_bitmap;
+
+    DECLARE_EVENT_TABLE()
+};
+
+#if wxUSE_METAFILE
+
+// and the same thing fo metafiles
+class DnDCanvasMetafile : public wxScrolledWindow
+{
+public:
+    DnDCanvasMetafile(wxWindow *parent) : wxScrolledWindow(parent) { }
+
+    void SetMetafile(const wxMetafile& metafile)
+    {
+        m_metafile = metafile;
+
+        SetScrollbars(10, 10,
+                      m_metafile.GetWidth() / 10, m_metafile.GetHeight() / 10);

 
 

-  wxLog *m_pLog, *m_pLogPrev;
+        Refresh();
+    }
+
+    void OnPaint(wxPaintEvent&)
+    {
+        wxPaintDC dc(this);
+
+        if ( m_metafile.Ok() )
+        {
+            PrepareDC(dc);
+
+            m_metafile.Play(&dc);
+        }
+    }
+
+private:
+    wxMetafile m_metafile;

 
 

-  wxString m_strText;
+    DECLARE_EVENT_TABLE()

 };
 
 };
 

+#endif // wxUSE_METAFILE
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// IDs for the menu commands
+// Define a new frame type for the main frame

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-enum
+class DnDFrame : public wxFrame

 {
 {

-  Menu_Quit = 1,
-  Menu_Drag,
-  Menu_About = 101,
-  Menu_Help,
-  Menu_Clear,
-};
+public:
+    DnDFrame();
+    virtual ~DnDFrame();

 
 

-BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
-  EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
-  EVT_MENU(Menu_About, DnDFrame::OnAbout)
-  EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
-  EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
-  EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
-  EVT_LEFT_DOWN(       DnDFrame::OnLeftDown)
-  EVT_RIGHT_DOWN(      DnDFrame::OnRightDown)
-  EVT_PAINT(           DnDFrame::OnPaint)
-END_EVENT_TABLE()
+    void OnPaint(wxPaintEvent& event);
+    void OnSize(wxSizeEvent& event);
+    void OnQuit(wxCommandEvent& event);
+    void OnAbout(wxCommandEvent& event);
+    void OnDrag(wxCommandEvent& event);
+    void OnDragMoveByDefault(wxCommandEvent& event);
+    void OnDragMoveAllow(wxCommandEvent& event);
+    void OnNewFrame(wxCommandEvent& event);
+    void OnHelp (wxCommandEvent& event);
+#if wxUSE_LOG
+    void OnLogClear(wxCommandEvent& event);
+#endif // wxUSE_LOG

 
 

-// `Main program' equivalent, creating windows and returning main app frame
-bool DnDApp::OnInit()
-{
-  // create the main frame window
-  DnDFrame *frame = new DnDFrame((wxFrame  *) NULL, "Drag & Drop wxWindows App",
-                                 50, 50, 450, 340);
+    void OnCopy(wxCommandEvent& event);
+    void OnPaste(wxCommandEvent& event);

 
 

-  // activate it
-  frame->Show(TRUE);
+    void OnCopyBitmap(wxCommandEvent& event);
+    void OnPasteBitmap(wxCommandEvent& event);

 
 

-  SetTopWindow(frame);
+#if wxUSE_METAFILE
+    void OnPasteMetafile(wxCommandEvent& event);
+#endif // wxUSE_METAFILE

 
 

-  return TRUE;
-}
+    void OnCopyFiles(wxCommandEvent& event);

 
 

-DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
-        : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
-          m_strText("wxWindows drag & drop works :-)")
+    void OnUsePrimary(wxCommandEvent& event);

 
 

-{
-//  SetBackgroundColour(* wxWHITE);
+    void OnLeftDown(wxMouseEvent& event);
+    void OnRightDown(wxMouseEvent& event);
+
+#if wxUSE_DRAG_AND_DROP
+    void OnBeginDrag(wxTreeEvent& event);
+#endif // wxUSE_DRAG_AND_DROP
+
+    void OnUpdateUIMoveByDefault(wxUpdateUIEvent& event);
+
+    void OnUpdateUIPasteText(wxUpdateUIEvent& event);
+    void OnUpdateUIPasteBitmap(wxUpdateUIEvent& event);

 
 

-  // frame icon and status bar
-  SetIcon(wxICON(mondrian));
+private:
+#if wxUSE_DRAG_AND_DROP
+    // show the result of a dnd operation in the status bar
+    void LogDragResult(wxDragResult result);
+#endif // wxUSE_DRAG_AND_DROP

 
 

-//  const int widths[] = { -1 };
-  CreateStatusBar();

 
 

-  // construct menu
-  wxMenu *file_menu = new wxMenu;
-  file_menu->Append(Menu_Drag, "&Test drag...");
-  file_menu->AppendSeparator();
-  file_menu->Append(Menu_Quit, "E&xit");
+    // GUI controls
+    wxListBox  *m_ctrlFile,
+               *m_ctrlText;
+    wxGenericDirCtrl *m_ctrlDir;

 
 

-  wxMenu *log_menu = new wxMenu;
-  log_menu->Append(Menu_Clear, "Clear");
+#if wxUSE_LOG
+    wxTextCtrl *m_ctrlLog;

 
 

-  wxMenu *help_menu = new wxMenu;
-  help_menu->Append(Menu_Help, "&Help...");
-  help_menu->AppendSeparator();
-  help_menu->Append(Menu_About, "&About");
+    wxLog *m_pLog,
+          *m_pLogPrev;
+#endif // wxUSE_LOG

 
 

-  wxMenuBar *menu_bar = new wxMenuBar;
-  menu_bar->Append(file_menu, "&File");
-  menu_bar->Append(log_menu,  "&Log");
-  menu_bar->Append(help_menu, "&Help");
+    // move the text by default (or copy)?
+    bool m_moveByDefault;

 
 

-  SetMenuBar(menu_bar);
+    // allow moving the text at all?
+    bool m_moveAllow;

 
 

-  // make a panel with 3 subwindows
-  wxPoint pos(0, 0);
-  wxSize  size(400, 200);
+    // the text we drag
+    wxString m_strText;

 
 

-  wxString strFile("Drop files here!"), strText("Drop text on me");

 
 

-  m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
-  m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
+    DECLARE_EVENT_TABLE()
+};

 
 

-  m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
-                               wxTE_MULTILINE | wxTE_READONLY |
-                               wxSUNKEN_BORDER );
+// ----------------------------------------------------------------------------
+// A shape is an example of application-specific data which may be transported
+// via drag-and-drop or clipboard: in our case, we have different geometric
+// shapes, each one with its own colour and position
+// ----------------------------------------------------------------------------

 
 

-  // redirect log messages to the text window (don't forget to delete it!)
-  m_pLog = new wxLogTextCtrl(m_ctrlLog);
-  m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
+#if wxUSE_DRAG_AND_DROP

 
 

-  // associate drop targets with 2 text controls
-  m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
-  m_ctrlText->SetDropTarget( new DnDText(m_ctrlText) );
+class DnDShape
+{
+public:
+    enum Kind
+    {
+        None,
+        Triangle,
+        Rectangle,
+        Ellipse
+    };
+
+    DnDShape(const wxPoint& pos,
+             const wxSize& size,
+             const wxColour& col)
+        : m_pos(pos), m_size(size), m_col(col)
+    {
+    }

 
 

-  wxLayoutConstraints *c;
+    // this is for debugging - lets us see when exactly an object is freed
+    // (this may be later than you think if it's on the clipboard, for example)
+    virtual ~DnDShape() { }

 
 

-  // Top-left listbox
-  c = new wxLayoutConstraints;
-  c->left.SameAs(this, wxLeft);
-  c->top.SameAs(this, wxTop);
-  c->right.PercentOf(this, wxRight, 50);
-  c->height.PercentOf(this, wxHeight, 40);
-  m_ctrlFile->SetConstraints(c);
+    // the functions used for drag-and-drop: they dump and restore a shape into
+    // some bitwise-copiable data (might use streams too...)
+    // ------------------------------------------------------------------------

 
 

-  // Top-right listbox
-  c = new wxLayoutConstraints;
-  c->left.SameAs    (m_ctrlFile, wxRight);
-  c->top.SameAs     (this, wxTop);
-  c->right.SameAs   (this, wxRight);
-  c->height.PercentOf(this, wxHeight, 40);
-  m_ctrlText->SetConstraints(c);
+    // restore from buffer
+    static DnDShape *New(const void *buf);

 
 

-  // Lower text control
-  c = new wxLayoutConstraints;
-  c->left.SameAs    (this, wxLeft);
-  c->right.SameAs   (this, wxRight);
-  c->height.PercentOf(this, wxHeight, 40);
-  c->top.SameAs(m_ctrlText, wxBottom);
-  m_ctrlLog->SetConstraints(c);
+    virtual size_t GetDataSize() const
+    {
+        return sizeof(ShapeDump);
+    }

 
 

-  SetAutoLayout(TRUE);
-}
+    virtual void GetDataHere(void *buf) const
+    {
+        ShapeDump& dump = *(ShapeDump *)buf;
+        dump.x = m_pos.x;
+        dump.y = m_pos.y;
+        dump.w = m_size.x;
+        dump.h = m_size.y;
+        dump.r = m_col.Red();
+        dump.g = m_col.Green();
+        dump.b = m_col.Blue();
+        dump.k = GetKind();
+    }

 
 

-void DnDFrame::OnQuit(wxCommandEvent& /* event */)
-{
-  Close(TRUE);
-}
+    // accessors
+    const wxPoint& GetPosition() const { return m_pos; }
+    const wxColour& GetColour() const { return m_col; }
+    const wxSize& GetSize() const { return m_size; }

 
 

-void DnDFrame::OnPaint(wxPaintEvent& /*event*/)
+    void Move(const wxPoint& pos) { m_pos = pos; }
+
+    // to implement in derived classes
+    virtual Kind GetKind() const = 0;
+
+    virtual void Draw(wxDC& dc)
+    {
+        dc.SetPen(wxPen(m_col, 1, wxSOLID));
+    }
+
+protected:
+    //get a point 1 up and 1 left, otherwise the mid-point of a triangle is on the line
+    wxPoint GetCentre() const
+         { return wxPoint(m_pos.x + m_size.x / 2 - 1, m_pos.y + m_size.y / 2 - 1); }
+
+    struct ShapeDump
+    {
+        wxCoord x, y,             // position
+                w, h;             // size
+        int k;                    // kind
+        unsigned char r, g, b;    // colour
+    };
+
+    wxPoint  m_pos;
+    wxSize   m_size;
+    wxColour m_col;
+};
+
+class DnDTriangularShape : public DnDShape

 {
 {

-  int w = 0;
-  int h = 0;
-  GetClientSize( &w, &h );
+public:
+    DnDTriangularShape(const wxPoint& pos,
+                       const wxSize& size,
+                       const wxColour& col)
+        : DnDShape(pos, size, col)
+    {
+        wxLogMessage(wxT("DnDTriangularShape is being created"));
+    }

 
 

-  wxPaintDC dc(this);
-  dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL, FALSE, "charter" ) );
-  dc.DrawText( "Drag text from here!", 20, h-22 );
-}
+    virtual ~DnDTriangularShape()
+    {
+        wxLogMessage(wxT("DnDTriangularShape is being deleted"));
+    }
+
+    virtual Kind GetKind() const { return Triangle; }
+    virtual void Draw(wxDC& dc)
+    {
+        DnDShape::Draw(dc);
+
+        // well, it's a bit difficult to describe a triangle by position and
+        // size, but we're not doing geometry here, do we? ;-)
+        wxPoint p1(m_pos);
+        wxPoint p2(m_pos.x + m_size.x, m_pos.y);
+        wxPoint p3(m_pos.x, m_pos.y + m_size.y);
+
+        dc.DrawLine(p1, p2);
+        dc.DrawLine(p2, p3);
+        dc.DrawLine(p3, p1);
+
+        //works in multicolor modes; on GTK (at least) will fail in 16-bit color
+        dc.SetBrush(wxBrush(m_col, wxSOLID));
+        dc.FloodFill(GetCentre(), m_col, wxFLOOD_BORDER);
+    }
+};

 
 

-void DnDFrame::OnDrag(wxCommandEvent& /* event */)
+class DnDRectangularShape : public DnDShape

 {
 {

-  wxString strText = wxGetTextFromUser
-  (
-    "After you enter text in this dialog, press any mouse\n"
-    "button in the bottom (empty) part of the frame and \n"
-    "drag it anywhere - you will be in fact dragging the\n"
-    "text object containing this text",
-    "Please enter some text", m_strText, this
-  );
+public:
+    DnDRectangularShape(const wxPoint& pos,
+                        const wxSize& size,
+                        const wxColour& col)
+        : DnDShape(pos, size, col)
+    {
+        wxLogMessage(wxT("DnDRectangularShape is being created"));
+    }

 
 

-  m_strText = strText;
-}
+    virtual ~DnDRectangularShape()
+    {
+        wxLogMessage(wxT("DnDRectangularShape is being deleted"));
+    }
+
+    virtual Kind GetKind() const { return Rectangle; }
+    virtual void Draw(wxDC& dc)
+    {
+        DnDShape::Draw(dc);
+
+        wxPoint p1(m_pos);
+        wxPoint p2(p1.x + m_size.x, p1.y);
+        wxPoint p3(p2.x, p2.y + m_size.y);
+        wxPoint p4(p1.x, p3.y);
+
+        dc.DrawLine(p1, p2);
+        dc.DrawLine(p2, p3);
+        dc.DrawLine(p3, p4);
+        dc.DrawLine(p4, p1);

 
 

-void DnDFrame::OnAbout(wxCommandEvent& /* event */)
+        dc.SetBrush(wxBrush(m_col, wxSOLID));
+        dc.FloodFill(GetCentre(), m_col, wxFLOOD_BORDER);
+    }
+};
+
+class DnDEllipticShape : public DnDShape

 {
 {

-  wxMessageDialog dialog(this,
-                         "Drag-&-Drop Demo\n"
-                         "Please see \"Help|Help...\" for details\n"
-                         "Copyright (c) 1998 Vadim Zeitlin",
-                         "About wxDnD");
+public:
+    DnDEllipticShape(const wxPoint& pos,
+                     const wxSize& size,
+                     const wxColour& col)
+        : DnDShape(pos, size, col)
+    {
+        wxLogMessage(wxT("DnDEllipticShape is being created"));
+    }

 
 

-  dialog.ShowModal();
-}
+    virtual ~DnDEllipticShape()
+    {
+        wxLogMessage(wxT("DnDEllipticShape is being deleted"));
+    }

 
 

-void DnDFrame::OnHelp(wxCommandEvent& /* event */)
+    virtual Kind GetKind() const { return Ellipse; }
+    virtual void Draw(wxDC& dc)
+    {
+        DnDShape::Draw(dc);
+
+        dc.DrawEllipse(m_pos, m_size);
+
+        dc.SetBrush(wxBrush(m_col, wxSOLID));
+        dc.FloodFill(GetCentre(), m_col, wxFLOOD_BORDER);
+    }
+};
+
+// ----------------------------------------------------------------------------
+// A wxDataObject specialisation for the application-specific data
+// ----------------------------------------------------------------------------
+
+static const wxChar *shapeFormatId = wxT("wxShape");
+
+class DnDShapeDataObject : public wxDataObject

 {
 {

-  wxMessageDialog dialog(this,
-"This small program demonstrates drag & drop support in wxWindows. The program window\n"
-"consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
-"going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
-"and the right one accepts text.\n"
-"\n"
-"To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
-"the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
-"Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
-"File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
-"work with files) and see what changes.\n"
-"\n"
-"To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
-"it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
-"to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
-"change, don't release the mouse button until it does. You can change the string being\n"
-"dragged in in \"File|Test drag...\" dialog.\n"
-"\n"
-"\n"
-"Please send all questions/bug reports/suggestions &c to \n"
-"Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
-                        "wxDnD Help");
-
-  dialog.ShowModal();
-}
+public:
+    // ctor doesn't copy the pointer, so it shouldn't go away while this object
+    // is alive
+    DnDShapeDataObject(DnDShape *shape = (DnDShape *)NULL)
+    {
+        if ( shape )
+        {
+            // we need to copy the shape because the one we're handled may be
+            // deleted while it's still on the clipboard (for example) - and we
+            // reuse the serialisation methods here to copy it
+            void *buf = malloc(shape->DnDShape::GetDataSize());
+            shape->GetDataHere(buf);
+            m_shape = DnDShape::New(buf);
+
+            free(buf);
+        }
+        else
+        {
+            // nothing to copy
+            m_shape = NULL;
+        }
+
+        // this string should uniquely identify our format, but is otherwise
+        // arbitrary
+        m_formatShape.SetId(shapeFormatId);
+
+        // we don't draw the shape to a bitmap until it's really needed (i.e.
+        // we're asked to do so)
+        m_hasBitmap = false;
+#if wxUSE_METAFILE
+        m_hasMetaFile = false;
+#endif // wxUSE_METAFILE
+    }

 
 

-void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
+    virtual ~DnDShapeDataObject() { delete m_shape; }
+
+    // after a call to this function, the shape is owned by the caller and it
+    // is responsible for deleting it!
+    //
+    // NB: a better solution would be to make DnDShapes ref counted and this
+    //     is what should probably be done in a real life program, otherwise
+    //     the ownership problems become too complicated really fast
+    DnDShape *GetShape()
+    {
+        DnDShape *shape = m_shape;
+
+        m_shape = (DnDShape *)NULL;
+        m_hasBitmap = false;
+#if wxUSE_METAFILE
+        m_hasMetaFile = false;
+#endif // wxUSE_METAFILE
+
+        return shape;
+    }
+
+    // implement base class pure virtuals
+    // ----------------------------------
+
+    virtual wxDataFormat GetPreferredFormat(Direction WXUNUSED(dir)) const
+    {
+        return m_formatShape;
+    }
+
+    virtual size_t GetFormatCount(Direction dir) const
+    {
+        // our custom format is supported by both GetData() and SetData()
+        size_t nFormats = 1;
+        if ( dir == Get )
+        {
+            // but the bitmap format(s) are only supported for output
+            nFormats += m_dobjBitmap.GetFormatCount(dir);
+
+#if wxUSE_METAFILE
+            nFormats += m_dobjMetaFile.GetFormatCount(dir);
+#endif // wxUSE_METAFILE
+        }
+
+        return nFormats;
+    }
+
+    virtual void GetAllFormats(wxDataFormat *formats, Direction dir) const
+    {
+        formats[0] = m_formatShape;
+        if ( dir == Get )
+        {
+            // in Get direction we additionally support bitmaps and metafiles
+            // under Windows
+            m_dobjBitmap.GetAllFormats(&formats[1], dir);
+
+#if wxUSE_METAFILE
+            // don't assume that m_dobjBitmap has only 1 format
+            m_dobjMetaFile.GetAllFormats(&formats[1 +
+                    m_dobjBitmap.GetFormatCount(dir)], dir);
+#endif // wxUSE_METAFILE
+        }
+    }
+
+    virtual size_t GetDataSize(const wxDataFormat& format) const
+    {
+        if ( format == m_formatShape )
+        {
+            return m_shape->GetDataSize();
+        }
+#if wxUSE_METAFILE
+        else if ( m_dobjMetaFile.IsSupported(format) )
+        {
+            if ( !m_hasMetaFile )
+                CreateMetaFile();
+
+            return m_dobjMetaFile.GetDataSize(format);
+        }
+#endif // wxUSE_METAFILE
+        else
+        {
+            wxASSERT_MSG( m_dobjBitmap.IsSupported(format),
+                          wxT("unexpected format") );
+
+            if ( !m_hasBitmap )
+                CreateBitmap();
+
+            return m_dobjBitmap.GetDataSize();
+        }
+    }
+
+    virtual bool GetDataHere(const wxDataFormat& format, void *pBuf) const
+    {
+        if ( format == m_formatShape )
+        {
+            m_shape->GetDataHere(pBuf);
+
+            return true;
+        }
+#if wxUSE_METAFILE
+        else if ( m_dobjMetaFile.IsSupported(format) )
+        {
+            if ( !m_hasMetaFile )
+                CreateMetaFile();
+
+            return m_dobjMetaFile.GetDataHere(format, pBuf);
+        }
+#endif // wxUSE_METAFILE
+        else
+        {
+            wxASSERT_MSG( m_dobjBitmap.IsSupported(format),
+                          wxT("unexpected format") );
+
+            if ( !m_hasBitmap )
+                CreateBitmap();
+
+            return m_dobjBitmap.GetDataHere(pBuf);
+        }
+    }
+
+    virtual bool SetData(const wxDataFormat& format,
+                         size_t WXUNUSED(len), const void *buf)
+    {
+        wxCHECK_MSG( format == m_formatShape, false,
+                     wxT( "unsupported format") );
+
+        delete m_shape;
+        m_shape = DnDShape::New(buf);
+
+        // the shape has changed
+        m_hasBitmap = false;
+
+#if wxUSE_METAFILE
+        m_hasMetaFile = false;
+#endif // wxUSE_METAFILE
+
+        return true;
+    }
+
+private:
+    // creates a bitmap and assigns it to m_dobjBitmap (also sets m_hasBitmap)
+    void CreateBitmap() const;
+#if wxUSE_METAFILE
+    void CreateMetaFile() const;
+#endif // wxUSE_METAFILE
+
+    wxDataFormat        m_formatShape;  // our custom format
+
+    wxBitmapDataObject  m_dobjBitmap;   // it handles bitmaps
+    bool                m_hasBitmap;    // true if m_dobjBitmap has valid bitmap
+
+#if wxUSE_METAFILE
+    wxMetaFileDataObject m_dobjMetaFile;// handles metafiles
+    bool                 m_hasMetaFile; // true if we have valid metafile
+#endif // wxUSE_METAFILE
+
+    DnDShape           *m_shape;        // our data
+};
+
+// ----------------------------------------------------------------------------
+// A dialog to edit shape properties
+// ----------------------------------------------------------------------------
+
+class DnDShapeDialog : public wxDialog

 {
 {

-  m_ctrlLog->Clear();
-}
+public:
+    DnDShapeDialog(wxFrame *parent, DnDShape *shape);

 
 

-void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
+    DnDShape *GetShape() const;
+
+    virtual bool TransferDataToWindow();
+    virtual bool TransferDataFromWindow();
+
+    void OnColour(wxCommandEvent& event);
+
+private:
+    // input
+    DnDShape *m_shape;
+
+    // output
+    DnDShape::Kind m_shapeKind;
+    wxPoint  m_pos;
+    wxSize   m_size;
+    wxColour m_col;
+
+    // controls
+    wxRadioBox *m_radio;
+    wxTextCtrl *m_textX,
+               *m_textY,
+               *m_textW,
+               *m_textH;
+
+    DECLARE_EVENT_TABLE()
+};
+
+// ----------------------------------------------------------------------------
+// A frame for the shapes which can be drag-and-dropped between frames
+// ----------------------------------------------------------------------------
+
+class DnDShapeFrame : public wxFrame

 {
 {

-  if ( !m_strText.IsEmpty() ) 
-  {
-    // start drag operation
-#ifdef __WXMSW__
-    wxTextDataObject textData(m_strText);
-    wxDropSource dragSource( textData, this );
-#else
-    wxDropSource dragSource( new wxTextDataObject (m_strText), this );
-#endif
-    const char *pc;
+public:
+    DnDShapeFrame(wxFrame *parent);
+    ~DnDShapeFrame();

 
 

-    switch ( dragSource.DoDragDrop(TRUE) ) 
+    void SetShape(DnDShape *shape);
+    virtual bool SetShape(const wxRegion &region)

     {
     {

-      case wxDragError:   pc = "Error!";    break;
-      case wxDragNone:    pc = "Nothing";   break;
-      case wxDragCopy:    pc = "Copied";    break;
-      case wxDragMove:    pc = "Moved";     break;
-      case wxDragCancel:  pc = "Cancelled"; break;
-      default:                    pc = "Huh?";      break;
+        return wxFrame::SetShape( region );

     }
 
     }
 

-    SetStatusText(wxString("Drag result: ") + pc);
-  }
-}
+    // callbacks
+    void OnNewShape(wxCommandEvent& event);
+    void OnEditShape(wxCommandEvent& event);
+    void OnClearShape(wxCommandEvent& event);

 
 

-void DnDFrame::OnRightDown(wxMouseEvent &event )
-{
-  wxMenu *menu = new wxMenu;
+    void OnCopyShape(wxCommandEvent& event);
+    void OnPasteShape(wxCommandEvent& event);

 
 

-  menu->Append(Menu_Drag, "&Test drag...");
-  menu->Append(Menu_About, "&About");
-  menu->Append(Menu_Quit, "E&xit");
+    void OnUpdateUICopy(wxUpdateUIEvent& event);
+    void OnUpdateUIPaste(wxUpdateUIEvent& event);

 
 

-  PopupMenu( menu, event.GetX(), event.GetY() );
-}
+    void OnDrag(wxMouseEvent& event);
+    void OnPaint(wxPaintEvent& event);
+    void OnDrop(wxCoord x, wxCoord y, DnDShape *shape);

 
 

-DnDFrame::~DnDFrame()
+private:
+    DnDShape *m_shape;
+
+    static DnDShapeFrame *ms_lastDropTarget;
+
+    DECLARE_EVENT_TABLE()
+};
+
+// ----------------------------------------------------------------------------
+// wxDropTarget derivation for DnDShapes
+// ----------------------------------------------------------------------------
+
+class DnDShapeDropTarget : public wxDropTarget

 {
 {

-  if ( m_pLog != NULL ) {
-    if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
-      delete m_pLog;
-  }
-}
+public:
+    DnDShapeDropTarget(DnDShapeFrame *frame)
+        : wxDropTarget(new DnDShapeDataObject)
+    {
+        m_frame = frame;
+    }
+
+    // override base class (pure) virtuals
+    virtual wxDragResult OnEnter(wxCoord x, wxCoord y, wxDragResult def)
+    {
+#if wxUSE_STATUSBAR
+        m_frame->SetStatusText(_T("Mouse entered the frame"));
+#endif // wxUSE_STATUSBAR
+        return OnDragOver(x, y, def);
+    }
+    virtual void OnLeave()
+    {
+#if wxUSE_STATUSBAR
+        m_frame->SetStatusText(_T("Mouse left the frame"));
+#endif // wxUSE_STATUSBAR
+    }
+    virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def)
+    {
+        if ( !GetData() )
+        {
+            wxLogError(wxT("Failed to get drag and drop data"));
+
+            return wxDragNone;
+        }
+
+        m_frame->OnDrop(x, y,
+                        ((DnDShapeDataObject *)GetDataObject())->GetShape());
+
+        return def;
+    }
+
+private:
+    DnDShapeFrame *m_frame;
+};
+
+#endif // wxUSE_DRAG_AND_DROP

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// Notifications called by the base class
+// functions prototypes
+// ----------------------------------------------------------------------------
+
+static void ShowBitmap(const wxBitmap& bitmap);
+
+#if wxUSE_METAFILE
+static void ShowMetaFile(const wxMetaFile& metafile);
+#endif // wxUSE_METAFILE
+
+// ----------------------------------------------------------------------------
+// IDs for the menu commands

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-bool DnDText::OnDropText(long, long, const char *psz)
+
+enum

 {
 {

-  m_pOwner->Append(psz);
+    Menu_Quit = 1,
+    Menu_Drag,
+    Menu_DragMoveDef,
+    Menu_DragMoveAllow,
+    Menu_NewFrame,
+    Menu_About = 101,
+    Menu_Help,
+    Menu_Clear,
+    Menu_Copy,
+    Menu_Paste,
+    Menu_CopyBitmap,
+    Menu_PasteBitmap,
+    Menu_PasteMFile,
+    Menu_CopyFiles,
+    Menu_UsePrimary,
+    Menu_Shape_New = 500,
+    Menu_Shape_Edit,
+    Menu_Shape_Clear,
+    Menu_ShapeClipboard_Copy,
+    Menu_ShapeClipboard_Paste,
+    Button_Colour = 1001
+};

 
 

-  return TRUE;
-}
+BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
+    EVT_MENU(Menu_Quit,       DnDFrame::OnQuit)
+    EVT_MENU(Menu_About,      DnDFrame::OnAbout)
+    EVT_MENU(Menu_Drag,       DnDFrame::OnDrag)
+    EVT_MENU(Menu_DragMoveDef,  DnDFrame::OnDragMoveByDefault)
+    EVT_MENU(Menu_DragMoveAllow,DnDFrame::OnDragMoveAllow)
+    EVT_MENU(Menu_NewFrame,   DnDFrame::OnNewFrame)
+    EVT_MENU(Menu_Help,       DnDFrame::OnHelp)
+#if wxUSE_LOG
+    EVT_MENU(Menu_Clear,      DnDFrame::OnLogClear)
+#endif // wxUSE_LOG
+    EVT_MENU(Menu_Copy,       DnDFrame::OnCopy)
+    EVT_MENU(Menu_Paste,      DnDFrame::OnPaste)
+    EVT_MENU(Menu_CopyBitmap, DnDFrame::OnCopyBitmap)
+    EVT_MENU(Menu_PasteBitmap,DnDFrame::OnPasteBitmap)
+#if wxUSE_METAFILE
+    EVT_MENU(Menu_PasteMFile, DnDFrame::OnPasteMetafile)
+#endif // wxUSE_METAFILE
+    EVT_MENU(Menu_CopyFiles,  DnDFrame::OnCopyFiles)
+    EVT_MENU(Menu_UsePrimary, DnDFrame::OnUsePrimary)
+
+    EVT_UPDATE_UI(Menu_DragMoveDef, DnDFrame::OnUpdateUIMoveByDefault)
+
+    EVT_UPDATE_UI(Menu_Paste,       DnDFrame::OnUpdateUIPasteText)
+    EVT_UPDATE_UI(Menu_PasteBitmap, DnDFrame::OnUpdateUIPasteBitmap)
+
+    EVT_LEFT_DOWN(            DnDFrame::OnLeftDown)
+    EVT_RIGHT_DOWN(           DnDFrame::OnRightDown)
+    EVT_PAINT(                DnDFrame::OnPaint)
+    EVT_SIZE(                 DnDFrame::OnSize)
+END_EVENT_TABLE()
+
+#if wxUSE_DRAG_AND_DROP
+
+BEGIN_EVENT_TABLE(DnDShapeFrame, wxFrame)
+    EVT_MENU(Menu_Shape_New,    DnDShapeFrame::OnNewShape)
+    EVT_MENU(Menu_Shape_Edit,   DnDShapeFrame::OnEditShape)
+    EVT_MENU(Menu_Shape_Clear,  DnDShapeFrame::OnClearShape)
+
+    EVT_MENU(Menu_ShapeClipboard_Copy,  DnDShapeFrame::OnCopyShape)
+    EVT_MENU(Menu_ShapeClipboard_Paste, DnDShapeFrame::OnPasteShape)

 
 

-bool DnDFile::OnDropFiles(long, long, size_t nFiles,
-                          const char * const aszFiles[])
+    EVT_UPDATE_UI(Menu_ShapeClipboard_Copy,  DnDShapeFrame::OnUpdateUICopy)
+    EVT_UPDATE_UI(Menu_ShapeClipboard_Paste, DnDShapeFrame::OnUpdateUIPaste)
+
+    EVT_LEFT_DOWN(DnDShapeFrame::OnDrag)
+
+    EVT_PAINT(DnDShapeFrame::OnPaint)
+END_EVENT_TABLE()
+
+BEGIN_EVENT_TABLE(DnDShapeDialog, wxDialog)
+    EVT_BUTTON(Button_Colour, DnDShapeDialog::OnColour)
+END_EVENT_TABLE()
+
+#endif // wxUSE_DRAG_AND_DROP
+
+BEGIN_EVENT_TABLE(DnDCanvasBitmap, wxScrolledWindow)
+    EVT_PAINT(DnDCanvasBitmap::OnPaint)
+END_EVENT_TABLE()
+
+#if wxUSE_METAFILE
+BEGIN_EVENT_TABLE(DnDCanvasMetafile, wxScrolledWindow)
+    EVT_PAINT(DnDCanvasMetafile::OnPaint)
+END_EVENT_TABLE()
+#endif // wxUSE_METAFILE
+
+#endif // wxUSE_DRAG_AND_DROP
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// `Main program' equivalent, creating windows and returning main app frame
+bool DnDApp::OnInit()

 {
 {

-  wxString str;
-  str.Printf("%d files dropped", nFiles);
-  m_pOwner->Append(str);
-  for ( size_t n = 0; n < nFiles; n++ ) {
-    m_pOwner->Append(aszFiles[n]);
-  }
+    if ( !wxApp::OnInit() )
+        return false;
+
+#if wxUSE_DRAG_AND_DROP || wxUSE_CLIPBOARD
+    // switch on trace messages
+#if wxUSE_LOG
+#if defined(__WXGTK__)
+    wxLog::AddTraceMask(_T("clipboard"));
+#elif defined(__WXMSW__)
+    wxLog::AddTraceMask(wxTRACE_OleCalls);
+#endif
+#endif // wxUSE_LOG

 
 

-  return TRUE;
+#if wxUSE_LIBPNG
+    wxImage::AddHandler( new wxPNGHandler );
+#endif
+
+    // create the main frame window
+    new DnDFrame();
+
+    return true;
+#else
+    wxMessageBox( _T("This sample has to be compiled with wxUSE_DRAG_AND_DROP"), _T("Building error"), wxOK);
+    return false;
+#endif // wxUSE_DRAG_AND_DROP
+}
+
+#if wxUSE_DRAG_AND_DROP || wxUSE_CLIPBOARD
+
+DnDFrame::DnDFrame()
+        : wxFrame(NULL, wxID_ANY, _T("Drag-and-Drop/Clipboard wxWidgets Sample"),
+                  wxPoint(10, 100)),
+          m_strText(_T("wxWidgets drag & drop works :-)"))
+
+{
+    // frame icon and status bar
+    SetIcon(wxICON(sample));
+
+#if wxUSE_STATUSBAR
+    CreateStatusBar();
+#endif // wxUSE_STATUSBAR
+
+    // construct menu
+    wxMenu *file_menu = new wxMenu;
+    file_menu->Append(Menu_Drag, _T("&Test drag..."));
+    file_menu->AppendCheckItem(Menu_DragMoveDef, _T("&Move by default"));
+    file_menu->AppendCheckItem(Menu_DragMoveAllow, _T("&Allow moving"));
+    file_menu->AppendSeparator();
+    file_menu->Append(Menu_NewFrame, _T("&New frame\tCtrl-N"));
+    file_menu->AppendSeparator();
+    file_menu->Append(Menu_Quit, _T("E&xit\tCtrl-Q"));
+
+#if wxUSE_LOG
+    wxMenu *log_menu = new wxMenu;
+    log_menu->Append(Menu_Clear, _T("Clear\tCtrl-L"));
+#endif // wxUSE_LOG
+
+    wxMenu *help_menu = new wxMenu;
+    help_menu->Append(Menu_Help, _T("&Help..."));
+    help_menu->AppendSeparator();
+    help_menu->Append(Menu_About, _T("&About"));
+
+    wxMenu *clip_menu = new wxMenu;
+    clip_menu->Append(Menu_Copy, _T("&Copy text\tCtrl-C"));
+    clip_menu->Append(Menu_Paste, _T("&Paste text\tCtrl-V"));
+    clip_menu->AppendSeparator();
+    clip_menu->Append(Menu_CopyBitmap, _T("Copy &bitmap\tCtrl-Shift-C"));
+    clip_menu->Append(Menu_PasteBitmap, _T("Paste b&itmap\tCtrl-Shift-V"));
+#if wxUSE_METAFILE
+    clip_menu->AppendSeparator();
+    clip_menu->Append(Menu_PasteMFile, _T("Paste &metafile\tCtrl-M"));
+#endif // wxUSE_METAFILE
+    clip_menu->AppendSeparator();
+    clip_menu->Append(Menu_CopyFiles, _T("Copy &files\tCtrl-F"));
+    clip_menu->AppendSeparator();
+    clip_menu->AppendCheckItem(Menu_UsePrimary, _T("Use &primary selection\tCtrl-P"));
+
+    wxMenuBar *menu_bar = new wxMenuBar;
+    menu_bar->Append(file_menu, _T("&File"));
+#if wxUSE_LOG
+    menu_bar->Append(log_menu,  _T("&Log"));
+#endif // wxUSE_LOG
+    menu_bar->Append(clip_menu, _T("&Clipboard"));
+    menu_bar->Append(help_menu, _T("&Help"));
+
+    SetMenuBar(menu_bar);
+
+    // create the child controls
+    SetBackgroundColour(*wxWHITE); // labels read better on this background
+
+    wxString strFile(_T("Drop files here!")), strText(_T("Drop text on me"));
+
+    m_ctrlFile  = new wxListBox(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, 1, &strFile,
+                                wxLB_HSCROLL | wxLB_ALWAYS_SB );
+    m_ctrlText  = new wxListBox(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, 1, &strText,
+                                wxLB_HSCROLL | wxLB_ALWAYS_SB );
+    m_ctrlDir   = new wxGenericDirCtrl(this);
+
+#if wxUSE_LOG
+    m_ctrlLog   = new wxTextCtrl(this, wxID_ANY, wxEmptyString,
+                                 wxDefaultPosition, wxDefaultSize,
+                                 wxTE_MULTILINE | wxTE_READONLY |
+                                 wxSUNKEN_BORDER );
+
+    // redirect log messages to the text window
+    m_pLog = new wxLogTextCtrl(m_ctrlLog);
+    m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
+#endif // wxUSE_LOG
+
+#if wxUSE_DRAG_AND_DROP
+    // associate drop targets with the controls
+    m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
+    m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
+
+#if wxUSE_DRAG_AND_DROP
+    m_ctrlDir->Connect
+    (
+        wxID_ANY,
+        wxEVT_COMMAND_TREE_BEGIN_DRAG,
+        wxTreeEventHandler(DnDFrame::OnBeginDrag),
+        NULL,
+        this
+    );
+#endif // wxUSE_DRAG_AND_DROP
+
+#if wxUSE_LOG
+    m_ctrlLog->SetDropTarget(new URLDropTarget);
+#endif // wxUSE_LOG
+#endif // wxUSE_DRAG_AND_DROP
+
+    wxBoxSizer *sizer_top = new wxBoxSizer( wxHORIZONTAL );
+    sizer_top->Add(m_ctrlFile, 1, wxEXPAND );
+    sizer_top->Add(m_ctrlText, 1, wxEXPAND );
+
+    wxBoxSizer *sizerDirCtrl = new wxBoxSizer(wxVERTICAL);
+    sizerDirCtrl->Add(new wxStaticText(this, wxID_ANY, "Drag files from here"),
+                      wxSizerFlags().Centre().Border());
+    sizerDirCtrl->Add(m_ctrlDir, wxSizerFlags(1).Expand());
+    sizer_top->Add(sizerDirCtrl, 1, wxEXPAND );
+
+    // make all columns of reasonable minimal size
+    for ( unsigned n = 0; n < sizer_top->GetChildren().size(); n++ )
+        sizer_top->SetItemMinSize(n, 200, 300);
+
+    wxBoxSizer *sizer = new wxBoxSizer( wxVERTICAL );
+    sizer->Add(sizer_top, 1, wxEXPAND );
+#if wxUSE_LOG
+    sizer->Add(m_ctrlLog, 2, wxEXPAND);
+    sizer->SetItemMinSize(m_ctrlLog, 450, 200);
+#endif // wxUSE_LOG
+    sizer->AddSpacer(50);
+
+    // copy data by default but allow moving it as well
+    m_moveByDefault = false;
+    m_moveAllow = true;
+    menu_bar->Check(Menu_DragMoveAllow, true);
+
+    // set the correct size and show the frame
+    SetSizerAndFit(sizer);
+    Show();
+}
+
+void DnDFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
+{
+    Close(true);
+}
+
+void DnDFrame::OnSize(wxSizeEvent& event)
+{
+    Refresh();
+
+    event.Skip();
+}
+
+void DnDFrame::OnPaint(wxPaintEvent& WXUNUSED(event))
+{
+    int w = 0;
+    int h = 0;
+    GetClientSize( &w, &h );
+
+    wxPaintDC dc(this);
+    // dc.Clear(); -- this kills wxGTK
+    dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL, false, _T("charter") ) );
+    dc.DrawText( _T("Drag text from here!"), 100, h-50 );
+}
+
+void DnDFrame::OnUpdateUIMoveByDefault(wxUpdateUIEvent& event)
+{
+    // only can move by default if moving is allowed at all
+    event.Enable(m_moveAllow);
+}
+
+void DnDFrame::OnUpdateUIPasteText(wxUpdateUIEvent& event)
+{
+#ifdef __WXDEBUG__
+    // too many trace messages if we don't do it - this function is called
+    // very often
+    wxLogNull nolog;
+#endif
+
+    event.Enable( wxTheClipboard->IsSupported(wxDF_TEXT) );
+}
+
+void DnDFrame::OnUpdateUIPasteBitmap(wxUpdateUIEvent& event)
+{
+#ifdef __WXDEBUG__
+    // too many trace messages if we don't do it - this function is called
+    // very often
+    wxLogNull nolog;
+#endif
+
+    event.Enable( wxTheClipboard->IsSupported(wxDF_BITMAP) );
+}
+
+void DnDFrame::OnNewFrame(wxCommandEvent& WXUNUSED(event))
+{
+#if wxUSE_DRAG_AND_DROP
+    (new DnDShapeFrame(this))->Show(true);
+
+    wxLogStatus(this, wxT("Double click the new frame to select a shape for it"));
+#endif // wxUSE_DRAG_AND_DROP
+}
+
+void DnDFrame::OnDrag(wxCommandEvent& WXUNUSED(event))
+{
+#if wxUSE_DRAG_AND_DROP
+    wxString strText = wxGetTextFromUser
+        (
+            _T("After you enter text in this dialog, press any mouse\n")
+            _T("button in the bottom (empty) part of the frame and \n")
+            _T("drag it anywhere - you will be in fact dragging the\n")
+         _T("text object containing this text"),
+         _T("Please enter some text"), m_strText, this
+        );
+
+    m_strText = strText;
+#endif // wxUSE_DRAG_AND_DROP
+}
+
+void DnDFrame::OnDragMoveByDefault(wxCommandEvent& event)
+{
+    m_moveByDefault = event.IsChecked();
+}
+
+void DnDFrame::OnDragMoveAllow(wxCommandEvent& event)
+{
+    m_moveAllow = event.IsChecked();
+}
+
+void DnDFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
+{
+    wxMessageBox(_T("Drag-&-Drop Demo\n")
+                 _T("Please see \"Help|Help...\" for details\n")
+                 _T("Copyright (c) 1998 Vadim Zeitlin"),
+                 _T("About wxDnD"),
+                 wxICON_INFORMATION | wxOK,
+                 this);
+}
+
+void DnDFrame::OnHelp(wxCommandEvent& /* event */)
+{
+    wxMessageDialog dialog(this,
+                           _T("This small program demonstrates drag & drop support in wxWidgets. The program window\n")
+                           _T("consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n")
+                           _T("going on inside. The top part is split into 2 listboxes, the left one accepts files\n")
+                           _T("and the right one accepts text.\n")
+                           _T("\n")
+                           _T("To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n")
+                           _T("the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n")
+                           _T("Also, try dragging some files (you can select several at once) from Windows Explorer (or \n")
+                           _T("File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n")
+                           _T("work with files) and see what changes.\n")
+                           _T("\n")
+                           _T("To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n")
+                           _T("it to wordpad or any other droptarget accepting text (and of course you can just drag it\n")
+                           _T("to the right pane). Due to a lot of trace messages, the cursor might take some time to \n")
+                           _T("change, don't release the mouse button until it does. You can change the string being\n")
+                           _T("dragged in in \"File|Test drag...\" dialog.\n")
+                           _T("\n")
+                           _T("\n")
+                           _T("Please send all questions/bug reports/suggestions &c to \n")
+                           _T("Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>"),
+                           _T("wxDnD Help"));
+
+    dialog.ShowModal();
+}
+
+#if wxUSE_LOG
+void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
+{
+    m_ctrlLog->Clear();
+    m_ctrlText->Clear();
+    m_ctrlFile->Clear();
+}
+#endif // wxUSE_LOG
+
+#if wxUSE_DRAG_AND_DROP
+
+void DnDFrame::LogDragResult(wxDragResult result)
+{
+#if wxUSE_STATUSBAR
+    const wxChar *pc;
+    switch ( result )
+    {
+        case wxDragError:   pc = _T("Error!");    break;
+        case wxDragNone:    pc = _T("Nothing");   break;
+        case wxDragCopy:    pc = _T("Copied");    break;
+        case wxDragMove:    pc = _T("Moved");     break;
+        case wxDragCancel:  pc = _T("Cancelled"); break;
+        default:            pc = _T("Huh?");      break;
+    }
+
+    SetStatusText(wxString(_T("Drag result: ")) + pc);
+#else
+    wxUnusedVar(result);
+#endif // wxUSE_STATUSBAR
+}
+
+#endif // wxUSE_DRAG_AND_DROP
+
+void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
+{
+#if wxUSE_DRAG_AND_DROP
+    if ( !m_strText.empty() )
+    {
+        // start drag operation
+        wxTextDataObject textData(m_strText);
+        wxDropSource source(textData, this,
+                            wxDROP_ICON(dnd_copy),
+                            wxDROP_ICON(dnd_move),
+                            wxDROP_ICON(dnd_none));
+
+        int flags = 0;
+        if ( m_moveByDefault )
+            flags |= wxDrag_DefaultMove;
+        else if ( m_moveAllow )
+            flags |= wxDrag_AllowMove;
+
+        LogDragResult(source.DoDragDrop(flags));
+    }
+#endif // wxUSE_DRAG_AND_DROP
+}
+
+void DnDFrame::OnRightDown(wxMouseEvent &event )
+{
+    wxMenu menu(_T("Dnd sample menu"));
+
+    menu.Append(Menu_Drag, _T("&Test drag..."));
+    menu.AppendSeparator();
+    menu.Append(Menu_About, _T("&About"));
+
+    PopupMenu( &menu, event.GetX(), event.GetY() );
+}
+
+DnDFrame::~DnDFrame()
+{
+#if wxUSE_LOG
+    if ( m_pLog != NULL ) {
+        if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
+            delete m_pLog;
+    }
+#endif // wxUSE_LOG
+}
+
+void DnDFrame::OnUsePrimary(wxCommandEvent& event)
+{
+    const bool usePrimary = event.IsChecked();
+    wxTheClipboard->UsePrimarySelection(usePrimary);
+
+    wxLogStatus(_T("Now using %s selection"), usePrimary ? _T("primary")
+                                                         : _T("clipboard"));
+}
+
+#if wxUSE_DRAG_AND_DROP
+
+void DnDFrame::OnBeginDrag(wxTreeEvent& WXUNUSED(event))
+{
+    wxFileDataObject data;
+    data.AddFile(m_ctrlDir->GetPath());
+
+    wxDropSource dragSource(this);
+    dragSource.SetData(data);
+
+    LogDragResult(dragSource.DoDragDrop());
+}
+
+#endif // wxUSE_DRAG_AND_DROP
+
+// ---------------------------------------------------------------------------
+// bitmap clipboard
+// ---------------------------------------------------------------------------
+
+void DnDFrame::OnCopyBitmap(wxCommandEvent& WXUNUSED(event))
+{
+    // PNG support is not always compiled in under Windows, so use BMP there
+#if wxUSE_LIBPNG
+    wxFileDialog dialog(this, _T("Open a PNG file"), wxEmptyString, wxEmptyString, _T("PNG files (*.png)|*.png"), 0);
+#else
+    wxFileDialog dialog(this, _T("Open a BMP file"), wxEmptyString, wxEmptyString, _T("BMP files (*.bmp)|*.bmp"), 0);
+#endif
+
+    if (dialog.ShowModal() != wxID_OK)
+    {
+        wxLogMessage( _T("Aborted file open") );
+        return;
+    }
+
+    if (dialog.GetPath().empty())
+    {
+        wxLogMessage( _T("Returned empty string.") );
+        return;
+    }
+
+    if (!wxFileExists(dialog.GetPath()))
+    {
+        wxLogMessage( _T("File doesn't exist.") );
+        return;
+    }
+
+    wxImage image;
+    image.LoadFile( dialog.GetPath(),
+#if wxUSE_LIBPNG
+                    wxBITMAP_TYPE_PNG
+#else
+                    wxBITMAP_TYPE_BMP
+#endif
+                  );
+    if (!image.Ok())
+    {
+        wxLogError( _T("Invalid image file...") );
+        return;
+    }
+
+    wxLogStatus( _T("Decoding image file...") );
+    wxYield();
+
+    wxBitmap bitmap( image );
+
+    if ( !wxTheClipboard->Open() )
+    {
+        wxLogError(_T("Can't open clipboard."));
+
+        return;
+    }
+
+    wxLogMessage( _T("Creating wxBitmapDataObject...") );
+    wxYield();
+
+    if ( !wxTheClipboard->AddData(new wxBitmapDataObject(bitmap)) )
+    {
+        wxLogError(_T("Can't copy image to the clipboard."));
+    }
+    else
+    {
+        wxLogMessage(_T("Image has been put on the clipboard.") );
+        wxLogMessage(_T("You can paste it now and look at it.") );
+    }
+
+    wxTheClipboard->Close();
+}
+
+void DnDFrame::OnPasteBitmap(wxCommandEvent& WXUNUSED(event))
+{
+    if ( !wxTheClipboard->Open() )
+    {
+        wxLogError(_T("Can't open clipboard."));
+
+        return;
+    }
+
+    if ( !wxTheClipboard->IsSupported(wxDF_BITMAP) )
+    {
+        wxLogWarning(_T("No bitmap on clipboard"));
+
+        wxTheClipboard->Close();
+        return;
+    }
+
+    wxBitmapDataObject data;
+    if ( !wxTheClipboard->GetData(data) )
+    {
+        wxLogError(_T("Can't paste bitmap from the clipboard"));
+    }
+    else
+    {
+        const wxBitmap& bmp = data.GetBitmap();
+
+        wxLogMessage(_T("Bitmap %dx%d pasted from the clipboard"),
+                     bmp.GetWidth(), bmp.GetHeight());
+        ShowBitmap(bmp);
+    }
+
+    wxTheClipboard->Close();

 }
 }

+
+#if wxUSE_METAFILE
+
+void DnDFrame::OnPasteMetafile(wxCommandEvent& WXUNUSED(event))
+{
+    if ( !wxTheClipboard->Open() )
+    {
+        wxLogError(_T("Can't open clipboard."));
+
+        return;
+    }
+
+    if ( !wxTheClipboard->IsSupported(wxDF_METAFILE) )
+    {
+        wxLogWarning(_T("No metafile on clipboard"));
+    }
+    else
+    {
+        wxMetaFileDataObject data;
+        if ( !wxTheClipboard->GetData(data) )
+        {
+            wxLogError(_T("Can't paste metafile from the clipboard"));
+        }
+        else
+        {
+            const wxMetaFile& mf = data.GetMetafile();
+
+            wxLogMessage(_T("Metafile %dx%d pasted from the clipboard"),
+                         mf.GetWidth(), mf.GetHeight());
+
+            ShowMetaFile(mf);
+        }
+    }
+
+    wxTheClipboard->Close();
+}
+
+#endif // wxUSE_METAFILE
+
+// ----------------------------------------------------------------------------
+// file clipboard
+// ----------------------------------------------------------------------------
+
+void DnDFrame::OnCopyFiles(wxCommandEvent& WXUNUSED(event))
+{
+#ifdef __WXMSW__
+    wxFileDialog dialog(this, _T("Select a file to copy"), wxEmptyString, wxEmptyString,
+                         _T("All files (*.*)|*.*"), 0);
+
+    wxArrayString filenames;
+    while ( dialog.ShowModal() == wxID_OK )
+    {
+        filenames.Add(dialog.GetPath());
+    }
+
+    if ( !filenames.IsEmpty() )
+    {
+        wxFileDataObject *dobj = new wxFileDataObject;
+        size_t count = filenames.GetCount();
+        for ( size_t n = 0; n < count; n++ )
+        {
+            dobj->AddFile(filenames[n]);
+        }
+
+        wxClipboardLocker locker;
+        if ( !locker )
+        {
+            wxLogError(wxT("Can't open clipboard"));
+        }
+        else
+        {
+            if ( !wxTheClipboard->AddData(dobj) )
+            {
+                wxLogError(wxT("Can't copy file(s) to the clipboard"));
+            }
+            else
+            {
+                wxLogStatus(this, wxT("%d file%s copied to the clipboard"),
+                            count, count == 1 ? wxEmptyString : wxEmptyString);
+            }
+        }
+    }
+    else
+    {
+        wxLogStatus(this, wxT("Aborted"));
+    }
+#else // !MSW
+    wxLogError(wxT("Sorry, not implemented"));
+#endif // MSW/!MSW
+}
+
+// ---------------------------------------------------------------------------
+// text clipboard
+// ---------------------------------------------------------------------------
+
+void DnDFrame::OnCopy(wxCommandEvent& WXUNUSED(event))
+{
+    if ( !wxTheClipboard->Open() )
+    {
+        wxLogError(_T("Can't open clipboard."));
+
+        return;
+    }
+
+    if ( !wxTheClipboard->AddData(new wxTextDataObject(m_strText)) )
+    {
+        wxLogError(_T("Can't copy data to the clipboard"));
+    }
+    else
+    {
+        wxLogMessage(_T("Text '%s' put on the clipboard"), m_strText.c_str());
+    }
+
+    wxTheClipboard->Close();
+}
+
+void DnDFrame::OnPaste(wxCommandEvent& WXUNUSED(event))
+{
+    if ( !wxTheClipboard->Open() )
+    {
+        wxLogError(_T("Can't open clipboard."));
+
+        return;
+    }
+
+    if ( !wxTheClipboard->IsSupported(wxDF_TEXT) )
+    {
+        wxLogWarning(_T("No text data on clipboard"));
+
+        wxTheClipboard->Close();
+        return;
+    }
+
+    wxTextDataObject text;
+    if ( !wxTheClipboard->GetData(text) )
+    {
+        wxLogError(_T("Can't paste data from the clipboard"));
+    }
+    else
+    {
+        wxLogMessage(_T("Text '%s' pasted from the clipboard"),
+                     text.GetText().c_str());
+    }
+
+    wxTheClipboard->Close();
+}
+
+#if wxUSE_DRAG_AND_DROP
+
+// ----------------------------------------------------------------------------
+// Notifications called by the base class
+// ----------------------------------------------------------------------------
+
+bool DnDText::OnDropText(wxCoord, wxCoord, const wxString& text)
+{
+    m_pOwner->Append(text);
+
+    return true;
+}
+
+bool DnDFile::OnDropFiles(wxCoord, wxCoord, const wxArrayString& filenames)
+{
+    size_t nFiles = filenames.GetCount();
+    wxString str;
+    str.Printf( _T("%d files dropped"), (int)nFiles);
+
+    if (m_pOwner != NULL)
+    {
+        m_pOwner->Append(str);
+        for ( size_t n = 0; n < nFiles; n++ )
+            m_pOwner->Append(filenames[n]);
+    }
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// DnDShapeDialog
+// ----------------------------------------------------------------------------
+
+DnDShapeDialog::DnDShapeDialog(wxFrame *parent, DnDShape *shape)
+  :wxDialog( parent, 6001, wxT("Choose Shape"), wxPoint( 10, 10 ),
+             wxSize( 40, 40 ),
+             wxDEFAULT_DIALOG_STYLE | wxRAISED_BORDER | wxRESIZE_BORDER )
+{
+    m_shape = shape;
+    wxBoxSizer* topSizer = new wxBoxSizer( wxVERTICAL );
+
+    // radio box
+    wxBoxSizer* shapesSizer = new wxBoxSizer( wxHORIZONTAL );
+    const wxString choices[] = { wxT("None"), wxT("Triangle"),
+                                 wxT("Rectangle"), wxT("Ellipse") };
+
+    m_radio = new wxRadioBox( this, wxID_ANY, wxT("&Shape"),
+                              wxDefaultPosition, wxDefaultSize, 4, choices, 4,
+                              wxRA_SPECIFY_COLS );
+    shapesSizer->Add( m_radio, 0, wxGROW|wxALL, 5 );
+    topSizer->Add( shapesSizer, 0, wxALL, 2 );
+
+    // attributes
+    wxStaticBox* box = new wxStaticBox( this, wxID_ANY, wxT("&Attributes") );
+    wxStaticBoxSizer* attrSizer = new wxStaticBoxSizer( box, wxHORIZONTAL );
+    wxFlexGridSizer* xywhSizer = new wxFlexGridSizer( 4, 2 );
+
+    wxStaticText* st;
+
+    st = new wxStaticText( this, wxID_ANY, wxT("Position &X:") );
+    m_textX = new wxTextCtrl( this, wxID_ANY, wxEmptyString, wxDefaultPosition,
+                              wxSize( 30, 20 ) );
+    xywhSizer->Add( st, 1, wxGROW|wxALL, 2 );
+    xywhSizer->Add( m_textX, 1, wxGROW|wxALL, 2 );
+
+    st = new wxStaticText( this, wxID_ANY, wxT("Size &width:") );
+    m_textW = new wxTextCtrl( this, wxID_ANY, wxEmptyString, wxDefaultPosition,
+                              wxSize( 30, 20 ) );
+    xywhSizer->Add( st, 1, wxGROW|wxALL, 2 );
+    xywhSizer->Add( m_textW, 1, wxGROW|wxALL, 2 );
+
+    st = new wxStaticText( this, wxID_ANY, wxT("&Y:") );
+    m_textY = new wxTextCtrl( this, wxID_ANY, wxEmptyString, wxDefaultPosition,
+                              wxSize( 30, 20 ) );
+    xywhSizer->Add( st, 1, wxALL|wxALIGN_RIGHT, 2 );
+    xywhSizer->Add( m_textY, 1, wxGROW|wxALL, 2 );
+
+    st = new wxStaticText( this, wxID_ANY, wxT("&height:") );
+    m_textH = new wxTextCtrl( this, wxID_ANY, wxEmptyString, wxDefaultPosition,
+                              wxSize( 30, 20 ) );
+    xywhSizer->Add( st, 1, wxALL|wxALIGN_RIGHT, 2 );
+    xywhSizer->Add( m_textH, 1, wxGROW|wxALL, 2 );
+
+    wxButton* col = new wxButton( this, Button_Colour, wxT("&Colour...") );
+    attrSizer->Add( xywhSizer, 1, wxGROW );
+    attrSizer->Add( col, 0, wxALL|wxALIGN_CENTRE_VERTICAL, 2 );
+    topSizer->Add( attrSizer, 0, wxGROW|wxALL, 5 );
+
+    // buttons
+    wxBoxSizer* buttonSizer = new wxBoxSizer( wxHORIZONTAL );
+    wxButton* bt;
+    bt = new wxButton( this, wxID_OK, wxT("Ok") );
+    buttonSizer->Add( bt, 0, wxALL, 2 );
+    bt = new wxButton( this, wxID_CANCEL, wxT("Cancel") );
+    buttonSizer->Add( bt, 0, wxALL, 2 );
+    topSizer->Add( buttonSizer, 0, wxALL|wxALIGN_RIGHT, 2 );
+
+    SetSizerAndFit( topSizer );
+}
+
+DnDShape *DnDShapeDialog::GetShape() const
+{
+    switch ( m_shapeKind )
+    {
+        default:
+        case DnDShape::None:      return NULL;
+        case DnDShape::Triangle:  return new DnDTriangularShape(m_pos, m_size, m_col);
+        case DnDShape::Rectangle: return new DnDRectangularShape(m_pos, m_size, m_col);
+        case DnDShape::Ellipse:   return new DnDEllipticShape(m_pos, m_size, m_col);
+    }
+}
+
+bool DnDShapeDialog::TransferDataToWindow()
+{
+
+    if ( m_shape )
+    {
+        m_radio->SetSelection(m_shape->GetKind());
+        m_pos = m_shape->GetPosition();
+        m_size = m_shape->GetSize();
+        m_col = m_shape->GetColour();
+    }
+    else
+    {
+        m_radio->SetSelection(DnDShape::None);
+        m_pos = wxPoint(1, 1);
+        m_size = wxSize(100, 100);
+    }
+
+    m_textX->SetValue(wxString() << m_pos.x);
+    m_textY->SetValue(wxString() << m_pos.y);
+    m_textW->SetValue(wxString() << m_size.x);
+    m_textH->SetValue(wxString() << m_size.y);
+
+    return true;
+}
+
+bool DnDShapeDialog::TransferDataFromWindow()
+{
+    m_shapeKind = (DnDShape::Kind)m_radio->GetSelection();
+
+    m_pos.x = wxAtoi(m_textX->GetValue());
+    m_pos.y = wxAtoi(m_textY->GetValue());
+    m_size.x = wxAtoi(m_textW->GetValue());
+    m_size.y = wxAtoi(m_textH->GetValue());
+
+    if ( !m_pos.x || !m_pos.y || !m_size.x || !m_size.y )
+    {
+        wxMessageBox(_T("All sizes and positions should be non null!"),
+                     _T("Invalid shape"), wxICON_HAND | wxOK, this);
+
+        return false;
+    }
+
+    return true;
+}
+
+void DnDShapeDialog::OnColour(wxCommandEvent& WXUNUSED(event))
+{
+    wxColourData data;
+    data.SetChooseFull(true);
+    for (int i = 0; i < 16; i++)
+    {
+        wxColour colour((unsigned char)(i*16), (unsigned char)(i*16), (unsigned char)(i*16));
+        data.SetCustomColour(i, colour);
+    }
+
+    wxColourDialog dialog(this, &data);
+    if ( dialog.ShowModal() == wxID_OK )
+    {
+        m_col = dialog.GetColourData().GetColour();
+    }
+}
+
+// ----------------------------------------------------------------------------
+// DnDShapeFrame
+// ----------------------------------------------------------------------------
+
+DnDShapeFrame *DnDShapeFrame::ms_lastDropTarget = NULL;
+
+DnDShapeFrame::DnDShapeFrame(wxFrame *parent)
+             : wxFrame(parent, wxID_ANY, _T("Shape Frame"))
+{
+#if wxUSE_STATUSBAR
+    CreateStatusBar();
+#endif // wxUSE_STATUSBAR
+
+    wxMenu *menuShape = new wxMenu;
+    menuShape->Append(Menu_Shape_New, _T("&New default shape\tCtrl-S"));
+    menuShape->Append(Menu_Shape_Edit, _T("&Edit shape\tCtrl-E"));
+    menuShape->AppendSeparator();
+    menuShape->Append(Menu_Shape_Clear, _T("&Clear shape\tCtrl-L"));
+
+    wxMenu *menuClipboard = new wxMenu;
+    menuClipboard->Append(Menu_ShapeClipboard_Copy, _T("&Copy\tCtrl-C"));
+    menuClipboard->Append(Menu_ShapeClipboard_Paste, _T("&Paste\tCtrl-V"));
+
+    wxMenuBar *menubar = new wxMenuBar;
+    menubar->Append(menuShape, _T("&Shape"));
+    menubar->Append(menuClipboard, _T("&Clipboard"));
+
+    SetMenuBar(menubar);
+
+#if wxUSE_STATUSBAR
+    SetStatusText(_T("Press Ctrl-S to create a new shape"));
+#endif // wxUSE_STATUSBAR
+
+    SetDropTarget(new DnDShapeDropTarget(this));
+
+    m_shape = NULL;
+
+    SetBackgroundColour(*wxWHITE);
+}
+
+DnDShapeFrame::~DnDShapeFrame()
+{
+    if (m_shape)
+        delete m_shape;
+}
+
+void DnDShapeFrame::SetShape(DnDShape *shape)
+{
+    if (m_shape)
+        delete m_shape;
+    m_shape = shape;
+    Refresh();
+}
+
+// callbacks
+void DnDShapeFrame::OnDrag(wxMouseEvent& event)
+{
+    if ( !m_shape )
+    {
+        event.Skip();
+
+        return;
+    }
+
+    // start drag operation
+    DnDShapeDataObject shapeData(m_shape);
+    wxDropSource source(shapeData, this);
+
+    const wxChar *pc = NULL;
+    switch ( source.DoDragDrop(true) )
+    {
+        default:
+        case wxDragError:
+            wxLogError(wxT("An error occurred during drag and drop operation"));
+            break;
+
+        case wxDragNone:
+#if wxUSE_STATUSBAR
+            SetStatusText(_T("Nothing happened"));
+#endif // wxUSE_STATUSBAR
+            break;
+
+        case wxDragCopy:
+            pc = _T("copied");
+            break;
+
+        case wxDragMove:
+            pc = _T("moved");
+            if ( ms_lastDropTarget != this )
+            {
+                // don't delete the shape if we dropped it on ourselves!
+                SetShape(NULL);
+            }
+            break;
+
+        case wxDragCancel:
+#if wxUSE_STATUSBAR
+            SetStatusText(_T("Drag and drop operation cancelled"));
+#endif // wxUSE_STATUSBAR
+            break;
+    }
+
+    if ( pc )
+    {
+#if wxUSE_STATUSBAR
+        SetStatusText(wxString(_T("Shape successfully ")) + pc);
+#endif // wxUSE_STATUSBAR
+    }
+    //else: status text already set
+}
+
+void DnDShapeFrame::OnDrop(wxCoord x, wxCoord y, DnDShape *shape)
+{
+    ms_lastDropTarget = this;
+
+    wxPoint pt(x, y);
+
+#if wxUSE_STATUSBAR
+    wxString s;
+    s.Printf(wxT("Shape dropped at (%d, %d)"), pt.x, pt.y);
+    SetStatusText(s);
+#endif // wxUSE_STATUSBAR
+
+    shape->Move(pt);
+    SetShape(shape);
+}
+
+void DnDShapeFrame::OnEditShape(wxCommandEvent& WXUNUSED(event))
+{
+    DnDShapeDialog dlg(this, m_shape);
+    if ( dlg.ShowModal() == wxID_OK )
+    {
+        SetShape(dlg.GetShape());
+
+#if wxUSE_STATUSBAR
+        if ( m_shape )
+        {
+            SetStatusText(_T("You can now drag the shape to another frame"));
+        }
+#endif // wxUSE_STATUSBAR
+    }
+}
+
+void DnDShapeFrame::OnNewShape(wxCommandEvent& WXUNUSED(event))
+{
+    SetShape(new DnDEllipticShape(wxPoint(10, 10), wxSize(80, 60), *wxRED));
+
+#if wxUSE_STATUSBAR
+    SetStatusText(_T("You can now drag the shape to another frame"));
+#endif // wxUSE_STATUSBAR
+}
+
+void DnDShapeFrame::OnClearShape(wxCommandEvent& WXUNUSED(event))
+{
+    SetShape(NULL);
+}
+
+void DnDShapeFrame::OnCopyShape(wxCommandEvent& WXUNUSED(event))
+{
+    if ( m_shape )
+    {
+        wxClipboardLocker clipLocker;
+        if ( !clipLocker )
+        {
+            wxLogError(wxT("Can't open the clipboard"));
+
+            return;
+        }
+
+        wxTheClipboard->AddData(new DnDShapeDataObject(m_shape));
+    }
+}
+
+void DnDShapeFrame::OnPasteShape(wxCommandEvent& WXUNUSED(event))
+{
+    wxClipboardLocker clipLocker;
+    if ( !clipLocker )
+    {
+        wxLogError(wxT("Can't open the clipboard"));
+
+        return;
+    }
+
+    DnDShapeDataObject shapeDataObject(NULL);
+    if ( wxTheClipboard->GetData(shapeDataObject) )
+    {
+        SetShape(shapeDataObject.GetShape());
+    }
+    else
+    {
+        wxLogStatus(wxT("No shape on the clipboard"));
+    }
+}
+
+void DnDShapeFrame::OnUpdateUICopy(wxUpdateUIEvent& event)
+{
+    event.Enable( m_shape != NULL );
+}
+
+void DnDShapeFrame::OnUpdateUIPaste(wxUpdateUIEvent& event)
+{
+    event.Enable( wxTheClipboard->IsSupported(wxDataFormat(shapeFormatId)) );
+}
+
+void DnDShapeFrame::OnPaint(wxPaintEvent& event)
+{
+    if ( m_shape )
+    {
+        wxPaintDC dc(this);
+
+        m_shape->Draw(dc);
+    }
+    else
+    {
+        event.Skip();
+    }
+}
+
+// ----------------------------------------------------------------------------
+// DnDShape
+// ----------------------------------------------------------------------------
+
+DnDShape *DnDShape::New(const void *buf)
+{
+    const ShapeDump& dump = *(const ShapeDump *)buf;
+    switch ( dump.k )
+    {
+        case Triangle:
+            return new DnDTriangularShape(wxPoint(dump.x, dump.y),
+                                          wxSize(dump.w, dump.h),
+                                          wxColour(dump.r, dump.g, dump.b));
+
+        case Rectangle:
+            return new DnDRectangularShape(wxPoint(dump.x, dump.y),
+                                           wxSize(dump.w, dump.h),
+                                           wxColour(dump.r, dump.g, dump.b));
+
+        case Ellipse:
+            return new DnDEllipticShape(wxPoint(dump.x, dump.y),
+                                        wxSize(dump.w, dump.h),
+                                        wxColour(dump.r, dump.g, dump.b));
+
+        default:
+            wxFAIL_MSG(wxT("invalid shape!"));
+            return NULL;
+    }
+}
+
+// ----------------------------------------------------------------------------
+// DnDShapeDataObject
+// ----------------------------------------------------------------------------
+
+#if wxUSE_METAFILE
+
+void DnDShapeDataObject::CreateMetaFile() const
+{
+    wxPoint pos = m_shape->GetPosition();
+    wxSize size = m_shape->GetSize();
+
+    wxMetaFileDC dcMF(wxEmptyString, pos.x + size.x, pos.y + size.y);
+
+    m_shape->Draw(dcMF);
+
+    wxMetafile *mf = dcMF.Close();
+
+    DnDShapeDataObject *self = (DnDShapeDataObject *)this; // const_cast
+    self->m_dobjMetaFile.SetMetafile(*mf);
+    self->m_hasMetaFile = true;
+
+    delete mf;
+}
+
+#endif // wxUSE_METAFILE
+
+void DnDShapeDataObject::CreateBitmap() const
+{
+    wxPoint pos = m_shape->GetPosition();
+    wxSize size = m_shape->GetSize();
+    int x = pos.x + size.x,
+        y = pos.y + size.y;
+    wxBitmap bitmap(x, y);
+    wxMemoryDC dc;
+    dc.SelectObject(bitmap);
+    dc.SetBrush(wxBrush(wxT("white"), wxSOLID));
+    dc.Clear();
+    m_shape->Draw(dc);
+    dc.SelectObject(wxNullBitmap);
+
+    DnDShapeDataObject *self = (DnDShapeDataObject *)this; // const_cast
+    self->m_dobjBitmap.SetBitmap(bitmap);
+    self->m_hasBitmap = true;
+}
+
+#endif // wxUSE_DRAG_AND_DROP
+
+// ----------------------------------------------------------------------------
+// global functions
+// ----------------------------------------------------------------------------
+
+static void ShowBitmap(const wxBitmap& bitmap)
+{
+    wxFrame *frame = new wxFrame(NULL, wxID_ANY, _T("Bitmap view"));
+#if wxUSE_STATUSBAR
+    frame->CreateStatusBar();
+#endif // wxUSE_STATUSBAR
+    DnDCanvasBitmap *canvas = new DnDCanvasBitmap(frame);
+    canvas->SetBitmap(bitmap);
+
+    int w = bitmap.GetWidth(),
+        h = bitmap.GetHeight();
+#if wxUSE_STATUSBAR
+    frame->SetStatusText(wxString::Format(_T("%dx%d"), w, h));
+#endif // wxUSE_STATUSBAR
+
+    frame->SetClientSize(w > 100 ? 100 : w, h > 100 ? 100 : h);
+    frame->Show(true);
+}
+
+#if wxUSE_METAFILE
+
+static void ShowMetaFile(const wxMetaFile& metafile)
+{
+    wxFrame *frame = new wxFrame(NULL, wxID_ANY, _T("Metafile view"));
+    frame->CreateStatusBar();
+    DnDCanvasMetafile *canvas = new DnDCanvasMetafile(frame);
+    canvas->SetMetafile(metafile);
+
+    wxSize size = metafile.GetSize();
+    frame->SetStatusText(wxString::Format(_T("%dx%d"), size.x, size.y));
+
+    frame->SetClientSize(size.x > 100 ? 100 : size.x,
+                         size.y > 100 ? 100 : size.y);
+    frame->Show();
+}
+
+#endif // wxUSE_METAFILE
+
+#endif // wxUSE_DRAG_AND_DROP || wxUSE_CLIPBOARD