src/gtk/clipbrd.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        clipbrd.cpp
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "clipbrd.h"
#endif

#include "wx/clipbrd.h"

#if wxUSE_CLIPBOARD

#include "wx/utils.h"

#include "glib.h"
#include "gdk/gdk.h"
#include "gtk/gtk.h"

//-----------------------------------------------------------------------------
// data
//-----------------------------------------------------------------------------

wxClipboard *wxTheClipboard = (wxClipboard*) NULL;

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;

//-----------------------------------------------------------------------------
// reminder
//-----------------------------------------------------------------------------

/* The contents of a selection are returned in a GtkSelectionData
   structure. selection/target identify the request.
   type specifies the type of the return; if length < 0, and
   the data should be ignored. This structure has object semantics -
   no fields should be modified directly, they should not be created
   directly, and pointers to them should not be stored beyond the duration of
   a callback. (If the last is changed, we'll need to add reference
   counting)

struct _GtkSelectionData
{
  GdkAtom selection;
  GdkAtom target;
  GdkAtom type;
  gint	  format;
  guchar *data;
  gint	  length;
};

*/

//-----------------------------------------------------------------------------
// "selection_received" for targets
//-----------------------------------------------------------------------------

static void
targets_selection_received( GtkWidget *WXUNUSED(widget),
                            GtkSelectionData *selection_data,
#if (GTK_MINOR_VERSION > 0)
                            guint32 WXUNUSED(time),
#endif
		            wxClipboard *clipboard )
{
    if (!wxTheClipboard)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    if (selection_data->length <= 0)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    /* make sure we got the data in the correct form */
    if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    // the atoms we received, holding a list of targets (= formats)
    GdkAtom *atoms = (GdkAtom *)selection_data->data;

    for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
    {
/*      char *name = gdk_atom_name (atoms[i]);
        if (name) printf( "Format available: %s.\n", name ); */

        if (atoms[i] == clipboard->m_targetRequested)
        {
            clipboard->m_waiting = FALSE;
            clipboard->m_formatSupported = TRUE;
            return;
        }
    }

    clipboard->m_waiting = FALSE;
    return;
}

//-----------------------------------------------------------------------------
// "selection_received" for the actual data
//-----------------------------------------------------------------------------

static void
selection_received( GtkWidget *WXUNUSED(widget),
                    GtkSelectionData *selection_data,
#if (GTK_MINOR_VERSION > 0)
                    guint32 WXUNUSED(time),
#endif
		    wxClipboard *clipboard )
{
    if (!wxTheClipboard)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    wxDataObject *data_object = clipboard->m_receivedData;

    if (!data_object)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    if (selection_data->length <= 0)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    /* make sure we got the data in the correct format */
    if (data_object->GetFormat().GetAtom() != selection_data->target)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    /* make sure we got the data in the correct form (selection type).
       if so, copy data to target object */

    switch (data_object->GetFormat().GetType())
    {
        case wxDF_TEXT:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_STRING)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    wxTextDataObject *text_object = (wxTextDataObject *) data_object;

	    wxString text = (const char*) selection_data->data;

	    text_object->SetText( text );

	    break;
	}

	case wxDF_BITMAP:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_BITMAP)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    break;
	}

	case wxDF_PRIVATE:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_STRING)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    wxPrivateDataObject *private_object = (wxPrivateDataObject *) data_object;

	    private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );

	    break;
	}

	default:
	{
            clipboard->m_waiting = FALSE;
	    return;
	}
    }

    wxTheClipboard->m_formatSupported = TRUE;
    clipboard->m_waiting = FALSE;
}

//-----------------------------------------------------------------------------
// "selection_clear"
//-----------------------------------------------------------------------------

static gint
selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event )
{
    if (!wxTheClipboard) return TRUE;

    if (event->selection == GDK_SELECTION_PRIMARY)
    {
        wxTheClipboard->m_ownsPrimarySelection = FALSE;
    }
    else
    if (event->selection == g_clipboardAtom)
    {
        wxTheClipboard->m_ownsClipboard = FALSE;
    }
    else
    {
        wxTheClipboard->m_waiting = FALSE;
        return FALSE;
    }

    if ((!wxTheClipboard->m_ownsPrimarySelection) &&
        (!wxTheClipboard->m_ownsClipboard))
    {
        /* the clipboard is no longer in our hands. we can the  clipboard data. */

        if (wxTheClipboard->m_dataBroker)
	{
	    delete wxTheClipboard->m_dataBroker;
	    wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	}
    }

    wxTheClipboard->m_waiting = FALSE;
    return TRUE;
}

//-----------------------------------------------------------------------------
// selection handler for supplying data
//-----------------------------------------------------------------------------

static void
selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
{
    if (!wxTheClipboard) return;

    if (!wxTheClipboard->m_dataBroker) return;

    wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();

    while (node)
    {
        wxDataObject *data_object = (wxDataObject *)node->Data();

	if (data_object->GetFormat().GetAtom() != selection_data->target)
	{
	    node = node->Next();
	    break;
	}

	switch (data_object->GetFormat().GetType())
	{
	    case wxDF_TEXT:
	    {
	        wxTextDataObject *text_object = (wxTextDataObject*) data_object;

	        wxString text = text_object->GetText();

#if wxUSE_UNICODE
		const wxWX2MBbuf s = text.mbc_str();
		int len = strlen(s);
#else // more efficient in non-Unicode
		const char *s = text.c_str();
		int len = (int) text.Length();
#endif

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned char*) (const char*) s,
		    len );

		break;
	    }

	    case wxDF_BITMAP:
	    {
	        // wxBitmapDataObject *private_object = (wxBitmapDataObject*) data_object;

		// how do we do that ?

		break;
	    }

	    case wxDF_PRIVATE:
            {
	        wxPrivateDataObject *private_object = (wxPrivateDataObject*) data_object;

	        if (private_object->GetSize() == 0) return;

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned char*) private_object->GetData(),
		    (int) private_object->GetSize() );
	    }

	    default:
	      break;
        }

	node = node->Next();
    }
}

//-----------------------------------------------------------------------------
// wxClipboard
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_dataBroker = (wxDataBroker*) NULL;

    m_receivedData = (wxDataObject*) NULL;

    /* we use m_targetsWidget to query what formats are available */

    m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
    gtk_widget_realize( m_targetsWidget );

    gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
                        "selection_received",
		        GTK_SIGNAL_FUNC( targets_selection_received ),
		        (gpointer) this );

    /* we use m_clipboardWidget to get and to offer data */

    m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
    gtk_widget_realize( m_clipboardWidget );

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_received",
		        GTK_SIGNAL_FUNC( selection_received ),
		        (gpointer) this );

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_clear_event",
		        GTK_SIGNAL_FUNC( selection_clear_clip ),
		        (gpointer) NULL );

    if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
    if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);

    m_formatSupported = FALSE;
    m_targetRequested = 0;
}

wxClipboard::~wxClipboard()
{
    Clear();

    if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
    if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
}

void wxClipboard::Clear()
{
    if (m_dataBroker)
    {
        /*  As we have data we also own the clipboard. Once we no longer own
            it, clear_selection is called which will set m_data to zero */

        if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
        {
            m_waiting = TRUE;

            gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );

            while (m_waiting) gtk_main_iteration();
        }

        if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
        {
            m_waiting = TRUE;

            gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );

            while (m_waiting) gtk_main_iteration();
        }

        if (m_dataBroker)
	{
	    delete m_dataBroker;
	    m_dataBroker = (wxDataBroker*) NULL;
	}
    }

    m_targetRequested = 0;

    m_formatSupported = FALSE;
}

bool wxClipboard::Open()
{
    wxCHECK_MSG( !m_open, FALSE, _T("clipboard already open") );

    m_open = TRUE;

    return TRUE;
}

bool wxClipboard::SetData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );

    wxCHECK_MSG( data, FALSE, _T("data is invalid") );

    Clear();

    return AddData( data );
}

bool wxClipboard::AddData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );

    wxCHECK_MSG( data, FALSE, _T("data is invalid") );

    /* if clipboard has been cleared before, create new data broker */

    if (!m_dataBroker) m_dataBroker = new wxDataBroker();

    /* add new data to list of offered data objects */

    m_dataBroker->Add( data );

    /* get native format id of new data object */

    GdkAtom format = data->GetFormat().GetAtom();

    wxCHECK_MSG( format, FALSE, _T("data has invalid format") );

    /* This should happen automatically, but to be on the safe side */

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    /* Add handlers if someone requests data */


#if (GTK_MINOR_VERSION > 0)

    gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                              GDK_SELECTION_PRIMARY,
			      format,
			      0 );  /* what is info ? */

    gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                              g_clipboardAtom,
			      format,
			      0 );  /* what is info ? */

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_get",
		        GTK_SIGNAL_FUNC(selection_handler),
		        (gpointer) NULL );

#else

    gtk_selection_add_handler( m_clipboardWidget,
                               g_clipboardAtom,
			       format,
			       selection_handler,
			       (gpointer) NULL );

    gtk_selection_add_handler( m_clipboardWidget,
                               GDK_SELECTION_PRIMARY,
			       format,
			       selection_handler,
			       (gpointer) NULL );
#endif

    /* Tell the world we offer clipboard data */

    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  g_clipboardAtom,
				  GDK_CURRENT_TIME ))
    {
        return FALSE;
    }
    m_ownsClipboard = TRUE;

    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  GDK_SELECTION_PRIMARY,
				  GDK_CURRENT_TIME ))
    {
        return FALSE;
    }
    m_ownsPrimarySelection = TRUE;

    return TRUE;
}

void wxClipboard::Close()
{
    wxCHECK_RET( m_open, _T("clipboard not open") );

    m_open = FALSE;
}

bool wxClipboard::IsSupported( wxDataFormat format )
{
    wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );

    /* store requested format to be asked for by callbacks */

    m_targetRequested = format.GetAtom();

    wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );

    m_formatSupported = FALSE;

    /* perform query. this will set m_formatSupported to
       TRUE if m_targetRequested is supported.
       alsom we have to wait for the "answer" from the
       clipboard owner which is an asynchronous process.
       therefore we set m_waiting = TRUE here and wait
       until the callback "targets_selection_received"
       sets it to FALSE */

    m_waiting = TRUE;

    gtk_selection_convert( m_targetsWidget,
			   g_clipboardAtom,
			   g_targetsAtom,
			   GDK_CURRENT_TIME );

    while (m_waiting) gtk_main_iteration();

    if (!m_formatSupported) return FALSE;

    return TRUE;
}

bool wxClipboard::GetData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );

    /* is data supported by clipboard ? */

    if (!IsSupported( data->GetFormat() )) return FALSE;

    /* store pointer to data object to be filled up by callbacks */

    m_receivedData = data;

    /* store requested format to be asked for by callbacks */

    m_targetRequested = data->GetFormat().GetAtom();

    wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );

    /* start query */

    m_formatSupported = FALSE;

    /* ask for clipboard contents.  this will set
       m_formatSupported to TRUE if m_targetRequested
       is supported.
       also, we have to wait for the "answer" from the
       clipboard owner which is an asynchronous process.
       therefore we set m_waiting = TRUE here and wait
       until the callback "targets_selection_received"
       sets it to FALSE */

    m_waiting = TRUE;

    gtk_selection_convert( m_clipboardWidget,
			   g_clipboardAtom,
			   m_targetRequested,
			   GDK_CURRENT_TIME );

    while (m_waiting) gtk_main_iteration();

    /* this is a true error as we checked for the presence of such data before */

    wxCHECK_MSG( m_formatSupported, FALSE, _T("error retrieving data from clipboard") );

    return TRUE;
}

//-----------------------------------------------------------------------------
// wxClipboardModule
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)

bool wxClipboardModule::OnInit()
{
    wxTheClipboard = new wxClipboard();

    return TRUE;
}

void wxClipboardModule::OnExit()
{
    if (wxTheClipboard) delete wxTheClipboard;
    wxTheClipboard = (wxClipboard*) NULL;
}

#endif

  // wxUSE_CLIPBOARD
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: clipbrd.cpp
	3	// Purpose:
	4	// Author: Robert Roebling
	5	// Id: $Id$
	6	// Copyright: (c) 1998 Robert Roebling
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	#ifdef __GNUG__
	11	#pragma implementation "clipbrd.h"
	12	#endif
	13
	14	#include "wx/clipbrd.h"
	15
	16	#if wxUSE_CLIPBOARD
	17
	18	#include "wx/utils.h"
	19
	20	#include "glib.h"
	21	#include "gdk/gdk.h"
	22	#include "gtk/gtk.h"
	23
	24	//-----------------------------------------------------------------------------
	25	// data
	26	//-----------------------------------------------------------------------------
	27
	28	wxClipboard wxTheClipboard = (wxClipboard) NULL;
	29
	30	GdkAtom g_clipboardAtom = 0;
	31	GdkAtom g_targetsAtom = 0;
	32
	33	//-----------------------------------------------------------------------------
	34	// reminder
	35	//-----------------------------------------------------------------------------
	36
	37	/* The contents of a selection are returned in a GtkSelectionData
	38	structure. selection/target identify the request.
	39	type specifies the type of the return; if length < 0, and
	40	the data should be ignored. This structure has object semantics -
	41	no fields should be modified directly, they should not be created
	42	directly, and pointers to them should not be stored beyond the duration of
	43	a callback. (If the last is changed, we'll need to add reference
	44	counting)
	45
	46	struct _GtkSelectionData
	47	{
	48	GdkAtom selection;
	49	GdkAtom target;
	50	GdkAtom type;
	51	gint format;
	52	guchar *data;
	53	gint length;
	54	};
	55
	56	*/
	57
	58	//-----------------------------------------------------------------------------
	59	// "selection_received" for targets
	60	//-----------------------------------------------------------------------------
	61
	62	static void
	63	targets_selection_received( GtkWidget *WXUNUSED(widget),
	64	GtkSelectionData *selection_data,
	65	#if (GTK_MINOR_VERSION > 0)
	66	guint32 WXUNUSED(time),
	67	#endif
	68	wxClipboard *clipboard )
	69	{
	70	if (!wxTheClipboard)
	71	{
	72	clipboard->m_waiting = FALSE;
	73	return;
	74	}
	75
	76	if (selection_data->length <= 0)
	77	{
	78	clipboard->m_waiting = FALSE;
	79	return;
	80	}
	81
	82	/* make sure we got the data in the correct form */
	83	if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
	84	{
	85	clipboard->m_waiting = FALSE;
	86	return;
	87	}
	88
	89	// the atoms we received, holding a list of targets (= formats)
	90	GdkAtom atoms = (GdkAtom )selection_data->data;
	91
	92	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	93	{
	94	/* char *name = gdk_atom_name (atoms[i]);
	95	if (name) printf( "Format available: %s.\n", name ); */
	96
	97	if (atoms[i] == clipboard->m_targetRequested)
	98	{
	99	clipboard->m_waiting = FALSE;
	100	clipboard->m_formatSupported = TRUE;
	101	return;
	102	}
	103	}
	104
	105	clipboard->m_waiting = FALSE;
	106	return;
	107	}
	108
	109	//-----------------------------------------------------------------------------
	110	// "selection_received" for the actual data
	111	//-----------------------------------------------------------------------------
	112
	113	static void
	114	selection_received( GtkWidget *WXUNUSED(widget),
	115	GtkSelectionData *selection_data,
	116	#if (GTK_MINOR_VERSION > 0)
	117	guint32 WXUNUSED(time),
	118	#endif
	119	wxClipboard *clipboard )
	120	{
	121	if (!wxTheClipboard)
	122	{
	123	clipboard->m_waiting = FALSE;
	124	return;
	125	}
	126
	127	wxDataObject *data_object = clipboard->m_receivedData;
	128
	129	if (!data_object)
	130	{
	131	clipboard->m_waiting = FALSE;
	132	return;
	133	}
	134
	135	if (selection_data->length <= 0)
	136	{
	137	clipboard->m_waiting = FALSE;
	138	return;
	139	}
	140
	141	/* make sure we got the data in the correct format */
	142	if (data_object->GetFormat().GetAtom() != selection_data->target)
	143	{
	144	clipboard->m_waiting = FALSE;
	145	return;
	146	}
	147
	148	/* make sure we got the data in the correct form (selection type).
	149	if so, copy data to target object */
	150
	151	switch (data_object->GetFormat().GetType())
	152	{
	153	case wxDF_TEXT:
	154	{
	155	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	156	{
	157	clipboard->m_waiting = FALSE;
	158	return;
	159	}
	160
	161	wxTextDataObject text_object = (wxTextDataObject ) data_object;
	162
	163	wxString text = (const char*) selection_data->data;
	164
	165	text_object->SetText( text );
	166
	167	break;
	168	}
	169
	170	case wxDF_BITMAP:
	171	{
	172	if (selection_data->type != GDK_SELECTION_TYPE_BITMAP)
	173	{
	174	clipboard->m_waiting = FALSE;
	175	return;
	176	}
	177
	178	break;
	179	}
	180
	181	case wxDF_PRIVATE:
	182	{
	183	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	184	{
	185	clipboard->m_waiting = FALSE;
	186	return;
	187	}
	188
	189	wxPrivateDataObject private_object = (wxPrivateDataObject ) data_object;
	190
	191	private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
	192
	193	break;
	194	}
	195
	196	default:
	197	{
	198	clipboard->m_waiting = FALSE;
	199	return;
	200	}
	201	}
	202
	203	wxTheClipboard->m_formatSupported = TRUE;
	204	clipboard->m_waiting = FALSE;
	205	}
	206
	207	//-----------------------------------------------------------------------------
	208	// "selection_clear"
	209	//-----------------------------------------------------------------------------
	210
	211	static gint
	212	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	213	{
	214	if (!wxTheClipboard) return TRUE;
	215
	216	if (event->selection == GDK_SELECTION_PRIMARY)
	217	{
	218	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	219	}
	220	else
	221	if (event->selection == g_clipboardAtom)
	222	{
	223	wxTheClipboard->m_ownsClipboard = FALSE;
	224	}
	225	else
	226	{
	227	wxTheClipboard->m_waiting = FALSE;
	228	return FALSE;
	229	}
	230
	231	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	232	(!wxTheClipboard->m_ownsClipboard))
	233	{
	234	/* the clipboard is no longer in our hands. we can the clipboard data. */
	235
	236	if (wxTheClipboard->m_dataBroker)
	237	{
	238	delete wxTheClipboard->m_dataBroker;
	239	wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	240	}
	241	}
	242
	243	wxTheClipboard->m_waiting = FALSE;
	244	return TRUE;
	245	}
	246
	247	//-----------------------------------------------------------------------------
	248	// selection handler for supplying data
	249	//-----------------------------------------------------------------------------
	250
	251	static void
	252	selection_handler( GtkWidget WXUNUSED(widget), GtkSelectionData selection_data, gpointer WXUNUSED(data) )
	253	{
	254	if (!wxTheClipboard) return;
	255
	256	if (!wxTheClipboard->m_dataBroker) return;
	257
	258	wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();
	259
	260	while (node)
	261	{
	262	wxDataObject data_object = (wxDataObject )node->Data();
	263
	264	if (data_object->GetFormat().GetAtom() != selection_data->target)
	265	{
	266	node = node->Next();
	267	break;
	268	}
	269
	270	switch (data_object->GetFormat().GetType())
	271	{
	272	case wxDF_TEXT:
	273	{
	274	wxTextDataObject text_object = (wxTextDataObject) data_object;
	275
	276	wxString text = text_object->GetText();
	277
	278	#if wxUSE_UNICODE
	279	const wxWX2MBbuf s = text.mbc_str();
	280	int len = strlen(s);
	281	#else // more efficient in non-Unicode
	282	const char *s = text.c_str();
	283	int len = (int) text.Length();
	284	#endif
	285
	286	gtk_selection_data_set(
	287	selection_data,
	288	GDK_SELECTION_TYPE_STRING,
	289	8*sizeof(gchar),
	290	(unsigned char) (const char) s,
	291	len );
	292
	293	break;
	294	}
	295
	296	case wxDF_BITMAP:
	297	{
	298	// wxBitmapDataObject private_object = (wxBitmapDataObject) data_object;
	299
	300	// how do we do that ?
	301
	302	break;
	303	}
	304
	305	case wxDF_PRIVATE:
	306	{
	307	wxPrivateDataObject private_object = (wxPrivateDataObject) data_object;
	308
	309	if (private_object->GetSize() == 0) return;
	310
	311	gtk_selection_data_set(
	312	selection_data,
	313	GDK_SELECTION_TYPE_STRING,
	314	8*sizeof(gchar),
	315	(unsigned char*) private_object->GetData(),
	316	(int) private_object->GetSize() );
	317	}
	318
	319	default:
	320	break;
	321	}
	322
	323	node = node->Next();
	324	}
	325	}
	326
	327	//-----------------------------------------------------------------------------
	328	// wxClipboard
	329	//-----------------------------------------------------------------------------
	330
	331	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	332
	333	wxClipboard::wxClipboard()
	334	{
	335	m_open = FALSE;
	336
	337	m_ownsClipboard = FALSE;
	338	m_ownsPrimarySelection = FALSE;
	339
	340	m_dataBroker = (wxDataBroker*) NULL;
	341
	342	m_receivedData = (wxDataObject*) NULL;
	343
	344	/* we use m_targetsWidget to query what formats are available */
	345
	346	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	347	gtk_widget_realize( m_targetsWidget );
	348
	349	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	350	"selection_received",
	351	GTK_SIGNAL_FUNC( targets_selection_received ),
	352	(gpointer) this );
	353
	354	/* we use m_clipboardWidget to get and to offer data */
	355
	356	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	357	gtk_widget_realize( m_clipboardWidget );
	358
	359	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	360	"selection_received",
	361	GTK_SIGNAL_FUNC( selection_received ),
	362	(gpointer) this );
	363
	364	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	365	"selection_clear_event",
	366	GTK_SIGNAL_FUNC( selection_clear_clip ),
	367	(gpointer) NULL );
	368
	369	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	370	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	371
	372	m_formatSupported = FALSE;
	373	m_targetRequested = 0;
	374	}
	375
	376	wxClipboard::~wxClipboard()
	377	{
	378	Clear();
	379
	380	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	381	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	382	}
	383
	384	void wxClipboard::Clear()
	385	{
	386	if (m_dataBroker)
	387	{
	388	/* As we have data we also own the clipboard. Once we no longer own
	389	it, clear_selection is called which will set m_data to zero */
	390
	391	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	392	{
	393	m_waiting = TRUE;
	394
	395	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	396
	397	while (m_waiting) gtk_main_iteration();
	398	}
	399
	400	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	401	{
	402	m_waiting = TRUE;
	403
	404	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	405
	406	while (m_waiting) gtk_main_iteration();
	407	}
	408
	409	if (m_dataBroker)
	410	{
	411	delete m_dataBroker;
	412	m_dataBroker = (wxDataBroker*) NULL;
	413	}
	414	}
	415
	416	m_targetRequested = 0;
	417
	418	m_formatSupported = FALSE;
	419	}
	420
	421	bool wxClipboard::Open()
	422	{
	423	wxCHECK_MSG( !m_open, FALSE, _T("clipboard already open") );
	424
	425	m_open = TRUE;
	426
	427	return TRUE;
	428	}
	429
	430	bool wxClipboard::SetData( wxDataObject *data )
	431	{
	432	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	433
	434	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	435
	436	Clear();
	437
	438	return AddData( data );
	439	}
	440
	441	bool wxClipboard::AddData( wxDataObject *data )
	442	{
	443	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	444
	445	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	446
	447	/* if clipboard has been cleared before, create new data broker */
	448
	449	if (!m_dataBroker) m_dataBroker = new wxDataBroker();
	450
	451	/* add new data to list of offered data objects */
	452
	453	m_dataBroker->Add( data );
	454
	455	/* get native format id of new data object */
	456
	457	GdkAtom format = data->GetFormat().GetAtom();
	458
	459	wxCHECK_MSG( format, FALSE, _T("data has invalid format") );
	460
	461	/* This should happen automatically, but to be on the safe side */
	462
	463	m_ownsClipboard = FALSE;
	464	m_ownsPrimarySelection = FALSE;
	465
	466	/* Add handlers if someone requests data */
	467
	468
	469	#if (GTK_MINOR_VERSION > 0)
	470
	471	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	472	GDK_SELECTION_PRIMARY,
	473	format,
	474	0 ); /* what is info ? */
	475
	476	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	477	g_clipboardAtom,
	478	format,
	479	0 ); /* what is info ? */
	480
	481	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	482	"selection_get",
	483	GTK_SIGNAL_FUNC(selection_handler),
	484	(gpointer) NULL );
	485
	486	#else
	487
	488	gtk_selection_add_handler( m_clipboardWidget,
	489	g_clipboardAtom,
	490	format,
	491	selection_handler,
	492	(gpointer) NULL );
	493
	494	gtk_selection_add_handler( m_clipboardWidget,
	495	GDK_SELECTION_PRIMARY,
	496	format,
	497	selection_handler,
	498	(gpointer) NULL );
	499	#endif
	500
	501	/* Tell the world we offer clipboard data */
	502
	503	if (!gtk_selection_owner_set( m_clipboardWidget,
	504	g_clipboardAtom,
	505	GDK_CURRENT_TIME ))
	506	{
	507	return FALSE;
	508	}
	509	m_ownsClipboard = TRUE;
	510
	511	if (!gtk_selection_owner_set( m_clipboardWidget,
	512	GDK_SELECTION_PRIMARY,
	513	GDK_CURRENT_TIME ))
	514	{
	515	return FALSE;
	516	}
	517	m_ownsPrimarySelection = TRUE;
	518
	519	return TRUE;
	520	}
	521
	522	void wxClipboard::Close()
	523	{
	524	wxCHECK_RET( m_open, _T("clipboard not open") );
	525
	526	m_open = FALSE;
	527	}
	528
	529	bool wxClipboard::IsSupported( wxDataFormat format )
	530	{
	531	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	532
	533	/* store requested format to be asked for by callbacks */
	534
	535	m_targetRequested = format.GetAtom();
	536
	537	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	538
	539	m_formatSupported = FALSE;
	540
	541	/* perform query. this will set m_formatSupported to
	542	TRUE if m_targetRequested is supported.
	543	alsom we have to wait for the "answer" from the
	544	clipboard owner which is an asynchronous process.
	545	therefore we set m_waiting = TRUE here and wait
	546	until the callback "targets_selection_received"
	547	sets it to FALSE */
	548
	549	m_waiting = TRUE;
	550
	551	gtk_selection_convert( m_targetsWidget,
	552	g_clipboardAtom,
	553	g_targetsAtom,
	554	GDK_CURRENT_TIME );
	555
	556	while (m_waiting) gtk_main_iteration();
	557
	558	if (!m_formatSupported) return FALSE;
	559
	560	return TRUE;
	561	}
	562
	563	bool wxClipboard::GetData( wxDataObject *data )
	564	{
	565	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	566
	567	/* is data supported by clipboard ? */
	568
	569	if (!IsSupported( data->GetFormat() )) return FALSE;
	570
	571	/* store pointer to data object to be filled up by callbacks */
	572
	573	m_receivedData = data;
	574
	575	/* store requested format to be asked for by callbacks */
	576
	577	m_targetRequested = data->GetFormat().GetAtom();
	578
	579	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	580
	581	/* start query */
	582
	583	m_formatSupported = FALSE;
	584
	585	/* ask for clipboard contents. this will set
	586	m_formatSupported to TRUE if m_targetRequested
	587	is supported.
	588	also, we have to wait for the "answer" from the
	589	clipboard owner which is an asynchronous process.
	590	therefore we set m_waiting = TRUE here and wait
	591	until the callback "targets_selection_received"
	592	sets it to FALSE */
	593
	594	m_waiting = TRUE;
	595
	596	gtk_selection_convert( m_clipboardWidget,
	597	g_clipboardAtom,
	598	m_targetRequested,
	599	GDK_CURRENT_TIME );
	600
	601	while (m_waiting) gtk_main_iteration();
	602
	603	/* this is a true error as we checked for the presence of such data before */
	604
	605	wxCHECK_MSG( m_formatSupported, FALSE, _T("error retrieving data from clipboard") );
	606
	607	return TRUE;
	608	}
	609
	610	//-----------------------------------------------------------------------------
	611	// wxClipboardModule
	612	//-----------------------------------------------------------------------------
	613
	614	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	615
	616	bool wxClipboardModule::OnInit()
	617	{
	618	wxTheClipboard = new wxClipboard();
	619
	620	return TRUE;
	621	}
	622
	623	void wxClipboardModule::OnExit()
	624	{
	625	if (wxTheClipboard) delete wxTheClipboard;
	626	wxTheClipboard = (wxClipboard*) NULL;
	627	}
	628
	629	#endif
	630
	631	// wxUSE_CLIPBOARD
	632