src/gtk1/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++)
    {
        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 */

    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 );

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