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
    {
        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;

    /* 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)
        {
            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" );

    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, "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;

    /* 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, "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	/*
	95	char *name = gdk_atom_name (atoms[i]);
	96	if (name) printf( "Format available: %s.\n", name );
	97	*/
	98
	99	if (atoms[i] == clipboard->m_targetRequested)
	100	{
	101	clipboard->m_waiting = FALSE;
	102	clipboard->m_formatSupported = TRUE;
	103	return;
	104	}
	105	}
	106
	107	clipboard->m_waiting = FALSE;
	108	return;
	109	}
	110
	111	//-----------------------------------------------------------------------------
	112	// "selection_received" for the actual data
	113	//-----------------------------------------------------------------------------
	114
	115	static void
	116	selection_received( GtkWidget *WXUNUSED(widget),
	117	GtkSelectionData *selection_data,
	118	#if (GTK_MINOR_VERSION > 0)
	119	guint32 WXUNUSED(time),
	120	#endif
	121	wxClipboard *clipboard )
	122	{
	123	if (!wxTheClipboard)
	124	{
	125	clipboard->m_waiting = FALSE;
	126	return;
	127	}
	128
	129	wxDataObject *data_object = clipboard->m_receivedData;
	130
	131	if (!data_object)
	132	{
	133	clipboard->m_waiting = FALSE;
	134	return;
	135	}
	136
	137	if (selection_data->length <= 0)
	138	{
	139	clipboard->m_waiting = FALSE;
	140	return;
	141	}
	142
	143	/* make sure we got the data in the correct format */
	144	if (data_object->GetFormat().GetAtom() != selection_data->target)
	145	{
	146	clipboard->m_waiting = FALSE;
	147	return;
	148	}
	149
	150	/* make sure we got the data in the correct form (selection type).
	151	if so, copy data to target object */
	152
	153	switch (data_object->GetFormat().GetType())
	154	{
	155	case wxDF_TEXT:
	156	{
	157	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	158	{
	159	clipboard->m_waiting = FALSE;
	160	return;
	161	}
	162
	163	wxTextDataObject text_object = (wxTextDataObject ) data_object;
	164
	165	wxString text = (const char*) selection_data->data;
	166
	167	text_object->SetText( text );
	168
	169	break;
	170	}
	171
	172	case wxDF_BITMAP:
	173	{
	174	if (selection_data->type != GDK_SELECTION_TYPE_BITMAP)
	175	{
	176	clipboard->m_waiting = FALSE;
	177	return;
	178	}
	179
	180	break;
	181	}
	182
	183	case wxDF_PRIVATE:
	184	{
	185	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	186	{
	187	clipboard->m_waiting = FALSE;
	188	return;
	189	}
	190
	191	wxPrivateDataObject private_object = (wxPrivateDataObject ) data_object;
	192
	193	private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
	194
	195	break;
	196	}
	197
	198	default:
	199	{
	200	clipboard->m_waiting = FALSE;
	201	return;
	202	}
	203	}
	204
	205	wxTheClipboard->m_formatSupported = TRUE;
	206	clipboard->m_waiting = FALSE;
	207	}
	208
	209	//-----------------------------------------------------------------------------
	210	// "selection_clear"
	211	//-----------------------------------------------------------------------------
	212
	213	static gint
	214	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	215	{
	216	if (!wxTheClipboard) return TRUE;
	217
	218	if (event->selection == GDK_SELECTION_PRIMARY)
	219	{
	220	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	221	}
	222	else
	223	if (event->selection == g_clipboardAtom)
	224	{
	225	wxTheClipboard->m_ownsClipboard = FALSE;
	226	}
	227	else
	228	{
	229	return FALSE;
	230	}
	231
	232	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	233	(!wxTheClipboard->m_ownsClipboard))
	234	{
	235	/* the clipboard is no longer in our hands. we can the clipboard data. */
	236
	237	if (wxTheClipboard->m_dataBroker)
	238	{
	239	delete wxTheClipboard->m_dataBroker;
	240	wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	241	}
	242	}
	243
	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	char *s = WXSTRINGCAST text;
	279	int len = (int) text.Length();
	280
	281	gtk_selection_data_set(
	282	selection_data,
	283	GDK_SELECTION_TYPE_STRING,
	284	8*sizeof(gchar),
	285	(unsigned char*) s,
	286	len );
	287
	288	break;
	289	}
	290
	291	case wxDF_BITMAP:
	292	{
	293	// wxBitmapDataObject private_object = (wxBitmapDataObject) data_object;
	294
	295	// how do we do that ?
	296
	297	break;
	298	}
	299
	300	case wxDF_PRIVATE:
	301	{
	302	wxPrivateDataObject private_object = (wxPrivateDataObject) data_object;
	303
	304	if (private_object->GetSize() == 0) return;
	305
	306	gtk_selection_data_set(
	307	selection_data,
	308	GDK_SELECTION_TYPE_STRING,
	309	8*sizeof(gchar),
	310	(unsigned char*) private_object->GetData(),
	311	(int) private_object->GetSize() );
	312	}
	313
	314	default:
	315	break;
	316	}
	317
	318	node = node->Next();
	319	}
	320	}
	321
	322	//-----------------------------------------------------------------------------
	323	// wxClipboard
	324	//-----------------------------------------------------------------------------
	325
	326	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	327
	328	wxClipboard::wxClipboard()
	329	{
	330	m_open = FALSE;
	331
	332	m_ownsClipboard = FALSE;
	333	m_ownsPrimarySelection = FALSE;
	334
	335	m_dataBroker = (wxDataBroker*) NULL;
	336
	337	m_receivedData = (wxDataObject*) NULL;
	338
	339	/* we use m_targetsWidget to query what formats are available */
	340
	341	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	342	gtk_widget_realize( m_targetsWidget );
	343
	344	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	345	"selection_received",
	346	GTK_SIGNAL_FUNC( targets_selection_received ),
	347	(gpointer) this );
	348
	349	/* we use m_clipboardWidget to get and to offer data */
	350
	351	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	352	gtk_widget_realize( m_clipboardWidget );
	353
	354	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	355	"selection_received",
	356	GTK_SIGNAL_FUNC( selection_received ),
	357	(gpointer) this );
	358
	359	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	360	"selection_clear_event",
	361	GTK_SIGNAL_FUNC( selection_clear_clip ),
	362	(gpointer) NULL );
	363
	364	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	365	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	366
	367	m_formatSupported = FALSE;
	368	m_targetRequested = 0;
	369	}
	370
	371	wxClipboard::~wxClipboard()
	372	{
	373	Clear();
	374
	375	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	376	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	377	}
	378
	379	void wxClipboard::Clear()
	380	{
	381	if (m_dataBroker)
	382	{
	383	/* As we have data we also own the clipboard. Once we no longer own
	384	it, clear_selection is called which will set m_data to zero */
	385
	386	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	387	{
	388	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	389	}
	390
	391	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	392	{
	393	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	394	}
	395
	396	if (m_dataBroker)
	397	{
	398	delete m_dataBroker;
	399	m_dataBroker = (wxDataBroker*) NULL;
	400	}
	401	}
	402
	403	m_targetRequested = 0;
	404
	405	m_formatSupported = FALSE;
	406	}
	407
	408	bool wxClipboard::Open()
	409	{
	410	wxCHECK_MSG( !m_open, FALSE, "clipboard already open" );
	411
	412	m_open = TRUE;
	413
	414	return TRUE;
	415	}
	416
	417	bool wxClipboard::SetData( wxDataObject *data )
	418	{
	419	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	420
	421	wxCHECK_MSG( data, FALSE, "data is invalid" );
	422
	423	Clear();
	424
	425	return AddData( data );
	426	}
	427
	428	bool wxClipboard::AddData( wxDataObject *data )
	429	{
	430	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	431
	432	wxCHECK_MSG( data, FALSE, "data is invalid" );
	433
	434	/* if clipboard has been cleared before, create new data broker */
	435
	436	if (!m_dataBroker) m_dataBroker = new wxDataBroker();
	437
	438	/* add new data to list of offered data objects */
	439
	440	m_dataBroker->Add( data );
	441
	442	/* get native format id of new data object */
	443
	444	GdkAtom format = data->GetFormat().GetAtom();
	445
	446	wxCHECK_MSG( format, FALSE, "data has invalid format" );
	447
	448	/* This should happen automatically, but to be on the safe side */
	449
	450	m_ownsClipboard = FALSE;
	451	m_ownsPrimarySelection = FALSE;
	452
	453	/* Add handlers if someone requests data */
	454
	455
	456	#if (GTK_MINOR_VERSION > 0)
	457
	458	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	459	GDK_SELECTION_PRIMARY,
	460	format,
	461	0 ); /* what is info ? */
	462
	463	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	464	g_clipboardAtom,
	465	format,
	466	0 ); /* what is info ? */
	467
	468	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	469	"selection_get",
	470	GTK_SIGNAL_FUNC(selection_handler),
	471	(gpointer) NULL );
	472
	473	#else
	474
	475	gtk_selection_add_handler( m_clipboardWidget,
	476	g_clipboardAtom,
	477	format,
	478	selection_handler,
	479	(gpointer) NULL );
	480
	481	gtk_selection_add_handler( m_clipboardWidget,
	482	GDK_SELECTION_PRIMARY,
	483	format,
	484	selection_handler,
	485	(gpointer) NULL );
	486	#endif
	487
	488	/* Tell the world we offer clipboard data */
	489
	490	if (!gtk_selection_owner_set( m_clipboardWidget,
	491	g_clipboardAtom,
	492	GDK_CURRENT_TIME ))
	493	{
	494	return FALSE;
	495	}
	496	m_ownsClipboard = TRUE;
	497
	498	if (!gtk_selection_owner_set( m_clipboardWidget,
	499	GDK_SELECTION_PRIMARY,
	500	GDK_CURRENT_TIME ))
	501	{
	502	return FALSE;
	503	}
	504	m_ownsPrimarySelection = TRUE;
	505
	506	return TRUE;
	507	}
	508
	509	void wxClipboard::Close()
	510	{
	511	wxCHECK_RET( m_open, "clipboard not open" );
	512
	513	m_open = FALSE;
	514	}
	515
	516	bool wxClipboard::IsSupported( wxDataFormat format )
	517	{
	518	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	519
	520	/* store requested format to be asked for by callbacks */
	521
	522	m_targetRequested = format.GetAtom();
	523
	524	wxCHECK_MSG( m_targetRequested, FALSE, "invalid clipboard format" );
	525
	526	m_formatSupported = FALSE;
	527
	528	/* perform query. this will set m_formatSupported to
	529	TRUE if m_targetRequested is supported.
	530	alsom we have to wait for the "answer" from the
	531	clipboard owner which is an asynchronous process.
	532	therefore we set m_waiting = TRUE here and wait
	533	until the callback "targets_selection_received"
	534	sets it to FALSE */
	535
	536	m_waiting = TRUE;
	537
	538	gtk_selection_convert( m_targetsWidget,
	539	g_clipboardAtom,
	540	g_targetsAtom,
	541	GDK_CURRENT_TIME );
	542
	543	while (m_waiting) gtk_main_iteration();
	544
	545	if (!m_formatSupported) return FALSE;
	546
	547	return TRUE;
	548	}
	549
	550	bool wxClipboard::GetData( wxDataObject *data )
	551	{
	552	wxCHECK_MSG( m_open, FALSE, "clipboard not open" );
	553
	554	/* is data supported by clipboard ? */
	555
	556	if (!IsSupported( data->GetFormat() )) return FALSE;
	557
	558	/* store pointer to data object to be filled up by callbacks */
	559
	560	m_receivedData = data;
	561
	562	/* store requested format to be asked for by callbacks */
	563
	564	m_targetRequested = data->GetFormat().GetAtom();
	565
	566	wxCHECK_MSG( m_targetRequested, FALSE, "invalid clipboard format" );
	567
	568	/* start query */
	569
	570	m_formatSupported = FALSE;
	571
	572	/* ask for clipboard contents. this will set
	573	m_formatSupported to TRUE if m_targetRequested
	574	is supported.
	575	also, we have to wait for the "answer" from the
	576	clipboard owner which is an asynchronous process.
	577	therefore we set m_waiting = TRUE here and wait
	578	until the callback "targets_selection_received"
	579	sets it to FALSE */
	580
	581	m_waiting = TRUE;
	582
	583	gtk_selection_convert( m_clipboardWidget,
	584	g_clipboardAtom,
	585	m_targetRequested,
	586	GDK_CURRENT_TIME );
	587
	588	while (m_waiting) gtk_main_iteration();
	589
	590	/* this is a true error as we checked for the presence of such data before */
	591
	592	wxCHECK_MSG( m_formatSupported, FALSE, "error retrieving data from clipboard" );
	593
	594	return TRUE;
	595	}
	596
	597	//-----------------------------------------------------------------------------
	598	// wxClipboardModule
	599	//-----------------------------------------------------------------------------
	600
	601	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	602
	603	bool wxClipboardModule::OnInit()
	604	{
	605	wxTheClipboard = new wxClipboard();
	606
	607	return TRUE;
	608	}
	609
	610	void wxClipboardModule::OnExit()
	611	{
	612	if (wxTheClipboard) delete wxTheClipboard;
	613	wxTheClipboard = (wxClipboard*) NULL;
	614	}
	615
	616	#endif
	617
	618	// wxUSE_CLIPBOARD
	619