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->m_formatAtom != 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())
    {
        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.

        wxTheClipboard->m_dataObjects.Clear();
    }

    return TRUE;
}

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

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

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

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

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

	switch (data_object->GetFormat())
	{
	    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->GetDataSize() == 0) return;

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

	    default:
	      break;
        }

	node = node->Next();
    }
}

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_dataObjects.DeleteContents( TRUE );

    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_dataObjects.GetCount())
    {
        /*  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 );
        }

        m_dataObjects.Clear();
    }

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

    wxNode *node = m_dataObjects.First();

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

	if (d->GetFormat() == data->GetFormat())
	{
	    m_dataObjects.DeleteNode( node );

	    break;
	}

        node = node->Next();
    }

    m_dataObjects.Append( data );

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

    if (data->GetFormat() == wxDF_PRIVATE)
    {
        wxPrivateDataObject* pd = (wxPrivateDataObject*) data;

        wxCHECK_MSG( !pd->GetId().IsEmpty(), FALSE, "private clipboard format requires ID string" );

        data->m_formatAtom = GetTargetAtom( data->GetFormat(), pd->GetId() );
    }
    else
    {
        data->m_formatAtom = GetTargetAtom( data->GetFormat() );
    }

    // This should happen automatically

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    // Add handlers if someone requests data

    gtk_selection_add_handler( m_clipboardWidget,
                               g_clipboardAtom,
			       data->m_formatAtom,
			       selection_handler,
			       NULL );

    gtk_selection_add_handler( m_clipboardWidget,
                               GDK_SELECTION_PRIMARY,
			       data->m_formatAtom,
			       selection_handler,
			       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::IsSupportedFormat( wxDataFormat format, const wxString &id )
{
    m_targetRequested = GetTargetAtom( format, id );

    if (m_targetRequested == 0) return FALSE;

    // 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" );

    m_receivedData = data;

    wxCHECK_MSG( m_receivedData, FALSE, "invalid data object" );

    if (m_receivedData->GetFormat() == wxDF_PRIVATE)
    {
        wxPrivateDataObject* pd = (wxPrivateDataObject*) m_receivedData;

        wxCHECK_MSG( !pd->GetId().IsEmpty(), FALSE, "private clipboard format requires ID string" );

        m_targetRequested = GetTargetAtom( m_receivedData->GetFormat(), pd->GetId() );
    }
    else
    {
        m_targetRequested = GetTargetAtom( m_receivedData->GetFormat() );
    }

    data->m_formatAtom = m_targetRequested;

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

    m_formatSupported = FALSE;

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

    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 );

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

    return TRUE;
}

GdkAtom wxClipboard::GetTargetAtom( wxDataFormat format, const wxString &id )
{
    // What is X representation of that format?

    switch (format)
    {
        case wxDF_TEXT:
        {
            return GDK_TARGET_STRING;
				// g_textAtom
        }

        case wxDF_BITMAP:
        {
            return GDK_TARGET_BITMAP;
            break;
        }

        case wxDF_PRIVATE:
        {
            // we create our own X representation

            return gdk_atom_intern( WXSTRINGCAST( id ), FALSE );
        }

	default:
	{
	    return (GdkAtom) 0;
	}
    }

    return (GdkAtom) 0;
}

//-----------------------------------------------------------------------------
// 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->m_formatAtom != 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())
	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
	183	// clipboard data.
	184
	185	wxTheClipboard->m_dataObjects.Clear();
	186	}
	187
	188	return TRUE;
	189	}
	190
	191	//-----------------------------------------------------------------------------
	192	// selection handler for supplying data
	193	//-----------------------------------------------------------------------------
	194
	195	static void
	196	selection_handler( GtkWidget WXUNUSED(widget), GtkSelectionData selection_data, gpointer WXUNUSED(data) )
	197	{
	198	if (!wxTheClipboard) return;
	199
	200	wxNode *node = wxTheClipboard->m_dataObjects.First();
	201
	202	while (node)
	203	{
	204	wxDataObject data_object = (wxDataObject )node->Data();
	205
	206	if (data_object->m_formatAtom != selection_data->target)
	207	{
	208	node = node->Next();
	209	break;
	210	}
	211
	212	switch (data_object->GetFormat())
	213	{
	214	case wxDF_TEXT:
	215	{
	216	wxTextDataObject text_object = (wxTextDataObject) data_object;
	217
	218	wxString text = text_object->GetText();
	219
	220	char *s = WXSTRINGCAST text;
	221	int len = (int) text.Length();
	222
	223	gtk_selection_data_set(
	224	selection_data,
	225	GDK_SELECTION_TYPE_STRING,
	226	8*sizeof(gchar),
	227	(unsigned char*) s,
	228	len );
	229
	230	break;
	231	}
	232
	233	case wxDF_BITMAP:
	234	{
	235	// wxBitmapDataObject private_object = (wxBitmapDataObject) data_object;
	236
	237	// how do we do that ?
	238
	239	break;
	240	}
	241
	242	case wxDF_PRIVATE:
	243	{
	244	wxPrivateDataObject private_object = (wxPrivateDataObject) data_object;
	245
	246	if (private_object->GetDataSize() == 0) return;
	247
	248	gtk_selection_data_set(
	249	selection_data,
	250	GDK_SELECTION_TYPE_STRING,
	251	8*sizeof(gchar),
	252	(unsigned char*) private_object->GetData(),
	253	(int) private_object->GetDataSize() );
	254	}
	255
	256	default:
	257	break;
	258	}
	259
	260	node = node->Next();
	261	}
	262	}
	263
	264	//-----------------------------------------------------------------------------
	265	// wxClipboard
	266	//-----------------------------------------------------------------------------
	267
	268	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	269
	270	wxClipboard::wxClipboard()
	271	{
	272	m_open = FALSE;
	273
	274	m_ownsClipboard = FALSE;
	275	m_ownsPrimarySelection = FALSE;
	276
	277	m_dataObjects.DeleteContents( TRUE );
	278
	279	m_receivedData = (wxDataObject*) NULL;
	280
	281	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	282	gtk_widget_realize( m_clipboardWidget );
	283
	284	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	285	"selection_clear_event",
	286	GTK_SIGNAL_FUNC( selection_clear_clip ),
	287	(gpointer) NULL );
	288
	289	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	290	if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE );
	291	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	292
	293	m_formatSupported = FALSE;
	294	m_targetRequested = 0;
	295	}
	296
	297	wxClipboard::~wxClipboard()
	298	{
	299	Clear();
	300
	301	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	302	}
	303
	304	void wxClipboard::Clear()
	305	{
	306	if (m_dataObjects.GetCount())
	307	{
	308	/* As we have data we also own the clipboard. Once we no longer own
	309	it, clear_selection is called which will set m_data to zero */
	310
	311	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	312	{
	313	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	314	}
	315
	316	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	317	{
	318	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	319	}
	320
	321	m_dataObjects.Clear();
	322	}
	323
	324	m_targetRequested = 0;
	325
	326	m_formatSupported = FALSE;
	327	}
	328
	329	bool wxClipboard::Open()
	330	{
	331	wxCHECK_MSG( !m_open, FALSE, "clipboard already open" );
	332
	333	m_open = TRUE;
	334
	335	return TRUE;
	336	}
	337
	338	bool wxClipboard::SetData( wxDataObject *data )
	339	{
	340	wxCHECK_MSG( data, FALSE, "data is invalid" );
	341
	342	wxNode *node = m_dataObjects.First();
	343
	344	while (node)
	345	{
	346	wxDataObject d = (wxDataObject)node->Data();
	347
	348	if (d->GetFormat() == data->GetFormat())
	349	{
	350	m_dataObjects.DeleteNode( node );
	351
	352	break;
	353	}
	354
	355	node = node->Next();
	356	}
	357
	358	m_dataObjects.Append( data );
	359
	360	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	361
	362	if (data->GetFormat() == wxDF_PRIVATE)
	363	{
	364	wxPrivateDataObject* pd = (wxPrivateDataObject*) data;
	365
	366	wxCHECK_MSG( !pd->GetId().IsEmpty(), FALSE, "private clipboard format requires ID string" );
	367
	368	data->m_formatAtom = GetTargetAtom( data->GetFormat(), pd->GetId() );
	369	}
	370	else
	371	{
	372	data->m_formatAtom = GetTargetAtom( data->GetFormat() );
	373	}
	374
	375	// This should happen automatically
	376
	377	m_ownsClipboard = FALSE;
	378	m_ownsPrimarySelection = FALSE;
	379
	380	// Add handlers if someone requests data
	381
	382	gtk_selection_add_handler( m_clipboardWidget,
	383	g_clipboardAtom,
	384	data->m_formatAtom,
	385	selection_handler,
	386	NULL );
	387
	388	gtk_selection_add_handler( m_clipboardWidget,
	389	GDK_SELECTION_PRIMARY,
	390	data->m_formatAtom,
	391	selection_handler,
	392	NULL );
	393
	394	// Tell the world we offer clipboard data
	395
	396	if (!gtk_selection_owner_set( m_clipboardWidget,
	397	g_clipboardAtom,
	398	GDK_CURRENT_TIME ))
	399	{
	400	return FALSE;
	401	}
	402	m_ownsClipboard = TRUE;
	403
	404	if (!gtk_selection_owner_set( m_clipboardWidget,
	405	GDK_SELECTION_PRIMARY,
	406	GDK_CURRENT_TIME ))
	407	{
	408	return FALSE;
	409	}
	410	m_ownsPrimarySelection = TRUE;
	411
	412	return TRUE;
	413	}
	414
	415	void wxClipboard::Close()
	416	{
	417	wxCHECK_RET( m_open, "clipboard not open" );
	418
	419	m_open = FALSE;
	420	}
	421
	422	bool wxClipboard::IsSupportedFormat( wxDataFormat format, const wxString &id )
	423	{
	424	m_targetRequested = GetTargetAtom( format, id );
	425
	426	if (m_targetRequested == 0) return FALSE;
	427
	428	// add handler for target (= format) query
	429
	430	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	431	"selection_received",
	432	GTK_SIGNAL_FUNC( targets_selection_received ),
	433	(gpointer) this );
	434
	435	m_formatSupported = FALSE;
	436
	437	// perform query. this will set m_formatSupported to
	438	// TRUE if m_targetRequested is supported
	439
	440	gtk_selection_convert( m_clipboardWidget,
	441	g_clipboardAtom,
	442	g_targetsAtom,
	443	GDK_CURRENT_TIME );
	444
	445	gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
	446	GTK_SIGNAL_FUNC( targets_selection_received ),
	447	(gpointer) this );
	448
	449	if (!m_formatSupported) return FALSE;
	450
	451	return TRUE;
	452	}
	453
	454	bool wxClipboard::GetData( wxDataObject *data )
	455	{
	456	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	457
	458	m_receivedData = data;
	459
	460	wxCHECK_MSG( m_receivedData, FALSE, "invalid data object" );
	461
	462	if (m_receivedData->GetFormat() == wxDF_PRIVATE)
	463	{
	464	wxPrivateDataObject* pd = (wxPrivateDataObject*) m_receivedData;
	465
	466	wxCHECK_MSG( !pd->GetId().IsEmpty(), FALSE, "private clipboard format requires ID string" );
	467
	468	m_targetRequested = GetTargetAtom( m_receivedData->GetFormat(), pd->GetId() );
	469	}
	470	else
	471	{
	472	m_targetRequested = GetTargetAtom( m_receivedData->GetFormat() );
	473	}
	474
	475	data->m_formatAtom = m_targetRequested;
	476
	477	wxCHECK_MSG( m_targetRequested, FALSE, "unsupported clipboard format" );
	478
	479	m_formatSupported = FALSE;
	480
	481	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	482	"selection_received",
	483	GTK_SIGNAL_FUNC( selection_received ),
	484	(gpointer) this );
	485
	486	gtk_selection_convert( m_clipboardWidget,
	487	g_clipboardAtom,
	488	m_targetRequested,
	489	GDK_CURRENT_TIME );
	490
	491	gtk_signal_disconnect_by_func( GTK_OBJECT(m_clipboardWidget),
	492	GTK_SIGNAL_FUNC( selection_received ),
	493	(gpointer) this );
	494
	495	wxCHECK_MSG( m_formatSupported, FALSE, "error retrieving data from clipboard" );
	496
	497	return TRUE;
	498	}
	499
	500	GdkAtom wxClipboard::GetTargetAtom( wxDataFormat format, const wxString &id )
	501	{
	502	// What is X representation of that format?
	503
	504	switch (format)
	505	{
	506	case wxDF_TEXT:
	507	{
	508	return GDK_TARGET_STRING;
	509	// g_textAtom
	510	}
	511
	512	case wxDF_BITMAP:
	513	{
	514	return GDK_TARGET_BITMAP;
	515	break;
	516	}
	517
	518	case wxDF_PRIVATE:
	519	{
	520	// we create our own X representation
	521
	522	return gdk_atom_intern( WXSTRINGCAST( id ), FALSE );
	523	}
	524
	525	default:
	526	{
	527	return (GdkAtom) 0;
	528	}
	529	}
	530
	531	return (GdkAtom) 0;
	532	}
	533
	534	//-----------------------------------------------------------------------------
	535	// wxClipboardModule
	536	//-----------------------------------------------------------------------------
	537
	538	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	539
	540	bool wxClipboardModule::OnInit()
	541	{
	542	wxTheClipboard = new wxClipboard();
	543
	544	return TRUE;
	545	}
	546
	547	void wxClipboardModule::OnExit()
	548	{
	549	if (wxTheClipboard) delete wxTheClipboard;
	550	wxTheClipboard = (wxClipboard*) NULL;
	551	}
	552
	553	#endif
	554
	555	// wxUSE_CLIPBOARD
	556