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

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

wxClipboard *wxTheClipboard = (wxClipboard*) NULL;

GdkAtom  g_textAtom        = 0;
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,
		            wxClipboard *clipboard )
{
    if (!wxTheClipboard) return;

    if (selection_data->length <= 0) return;

    // make sure we got the data in the correct form
    if (selection_data->type != GDK_SELECTION_TYPE_ATOM) 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_formatSupported = TRUE;
            return;
        }
    }

    return;
}

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

static void
selection_received( GtkWidget *WXUNUSED(widget),
                    GtkSelectionData *selection_data,
		    wxClipboard *clipboard )
{
    if (!wxTheClipboard) return;

    wxDataObject *data_object = clipboard->m_receivedData;

    if (!data_object) return;

    if (selection_data->length <= 0) return;

    // make sure we got the data in the correct format

    if (data_object->GetFormat().GetAtom() != selection_data->target) 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) 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) return;

	    return;

	    break;
	}

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

	    wxPrivateDataObject *private_object = (wxPrivateDataObject *) data_object;

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

	    break;
	}

	default:
	{
	    return;
	}
    }

    wxTheClipboard->m_formatSupported = TRUE;
}

//-----------------------------------------------------------------------------
// "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
    {
        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;
	}
    }

    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();

		char *s = WXSTRINGCAST text;
		int len = (int) text.Length();

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned 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;

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

    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_textAtom) g_textAtom = gdk_atom_intern( "TEXT", 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 );
}

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

        if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
        {
            gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
        }

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

    m_targetRequested = 0;

    m_formatSupported = FALSE;
}

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

    m_open = TRUE;

    return TRUE;
}

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

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

    Clear();

    return AddData( data );
}

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

    wxCHECK_MSG( data, FALSE, "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, "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, "clipboard not open" );

    m_open = FALSE;
}

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

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

    m_targetRequested = format.GetAtom();

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

    /* add handler for target (= format) query */

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

    m_formatSupported = FALSE;

    /* perform query. this will set m_formatSupported to
     * TRUE if m_targetRequested is supported */

    gtk_selection_convert( m_clipboardWidget,
			   g_clipboardAtom,
			   g_targetsAtom,
			   GDK_CURRENT_TIME );

    gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
		                   GTK_SIGNAL_FUNC( targets_selection_received ),
		                   (gpointer) this );

    if (!m_formatSupported) return FALSE;

    return TRUE;
}

bool wxClipboard::GetData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, "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, "invalid clipboard format" );

    /* start query */

    m_formatSupported = FALSE;

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

    /* ask for clipboard contents */

    gtk_selection_convert( m_clipboardWidget,
			   g_clipboardAtom,
			   m_targetRequested,
			   GDK_CURRENT_TIME );

    gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
		                   GTK_SIGNAL_FUNC( selection_received ),
		                   (gpointer) this );

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

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