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"

//-----------------------------------------------------------------------------
// thread system
//-----------------------------------------------------------------------------

#if wxUSE_THREADS
extern void wxapp_install_thread_wakeup();
extern void wxapp_uninstall_thread_wakeup();
#endif

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

wxClipboard *wxTheClipboard = (wxClipboard*) NULL;

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;

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

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

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

*/

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

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

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

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

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

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

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

    clipboard->m_waiting = FALSE;
    return;
}

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

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

    wxDataObject *data_object = clipboard->m_receivedData;

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

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

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

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

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

	    wxTextDataObject *text_object = (wxTextDataObject *) data_object;

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

	    text_object->SetText( text );

	    break;
	}

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

	    break;
	}

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

	    wxPrivateDataObject *private_object = (wxPrivateDataObject *) data_object;

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

	    break;
	}

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

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

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

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

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

    if ((!wxTheClipboard->m_ownsPrimarySelection) &&
        (!wxTheClipboard->m_ownsClipboard))
    {
        /* the clipboard is no longer in our hands. we can the delete clipboard data. */
        if (wxTheClipboard->m_dataBroker)
	{
	    delete wxTheClipboard->m_dataBroker;
	    wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	}
    }

    wxTheClipboard->m_waiting = FALSE;
    return TRUE;
}

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

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

    if (!wxTheClipboard->m_dataBroker) return;

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

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

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

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

	        wxString text = text_object->GetText();

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

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

		break;
	    }

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

		// how do we do that ?

		break;
	    }

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

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

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

	    default:
	      break;
        }

	node = node->Next();
    }
}

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_dataBroker = (wxDataBroker*) NULL;

    m_receivedData = (wxDataObject*) NULL;

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

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

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

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

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

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

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

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

    m_formatSupported = FALSE;
    m_targetRequested = 0;

    m_usePrimary = FALSE;
}

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)
    {
#if wxUSE_THREADS
        /* disable GUI threads */
        wxapp_uninstall_thread_wakeup();
#endif

        /*  As we have data we also own the clipboard. Once we no longer own
            it, clear_selection is called which will set m_data to zero */
        if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
        {
            m_waiting = TRUE;

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

            while (m_waiting) gtk_main_iteration();
        }

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

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

            while (m_waiting) gtk_main_iteration();
        }

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

#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
    }

    m_targetRequested = 0;

    m_formatSupported = FALSE;
}

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

    m_open = TRUE;

    return TRUE;
}

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

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

    Clear();

    return AddData( data );
}

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

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

    /* if clipboard has been cleared before, create new data broker */
    if (!m_dataBroker) m_dataBroker = new wxDataBroker();

    /* add new data to list of offered data objects */
    m_dataBroker->Add( data );

    /* get native format id of new data object */
    GdkAtom format = data->GetFormat().GetAtom();

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

    /* This should happen automatically, but to be on the safe side */
    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    /* Add handlers if someone requests data */

#if (GTK_MINOR_VERSION > 0)

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

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

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

#else

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

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

#if wxUSE_THREADS
        /* disable GUI threads */
        wxapp_uninstall_thread_wakeup();
#endif

    /* Tell the world we offer clipboard data */
    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  g_clipboardAtom,
				  GDK_CURRENT_TIME ))
    {
#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
        return FALSE;
    }
    m_ownsClipboard = TRUE;

    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  GDK_SELECTION_PRIMARY,
				  GDK_CURRENT_TIME ))
    {
#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
        return FALSE;
    }
    m_ownsPrimarySelection = TRUE;

#if wxUSE_THREADS
    /* re-enable GUI threads */
    wxapp_install_thread_wakeup();
#endif

    return TRUE;
}

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

    m_open = FALSE;
}

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

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

    m_targetRequested = format.GetAtom();

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

    m_formatSupported = FALSE;

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

    m_waiting = TRUE;

    gtk_selection_convert( m_targetsWidget,
			   m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
			   g_targetsAtom,
			   GDK_CURRENT_TIME );

    while (m_waiting) gtk_main_iteration();

    if (!m_formatSupported) return FALSE;

    return TRUE;
}

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

    /* is data supported by clipboard ? */

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

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

    m_receivedData = data;

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

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

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

    /* start query */

    m_formatSupported = FALSE;

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

    m_waiting = TRUE;

    gtk_selection_convert( m_clipboardWidget,
			   m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
			   m_targetRequested,
			   GDK_CURRENT_TIME );

    while (m_waiting) gtk_main_iteration();

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

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

    return TRUE;
}

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)

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

    return TRUE;
}

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

#endif

  // wxUSE_CLIPBOARD
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: clipbrd.cpp
	3	// Purpose:
	4	// Author: Robert Roebling
	5	// Id: $Id$
	6	// Copyright: (c) 1998 Robert Roebling
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	#ifdef __GNUG__
	11	#pragma implementation "clipbrd.h"
	12	#endif
	13
	14	#include "wx/clipbrd.h"
	15
	16	#if wxUSE_CLIPBOARD
	17
	18	#include "wx/utils.h"
	19
	20	#include "glib.h"
	21	#include "gdk/gdk.h"
	22	#include "gtk/gtk.h"
	23
	24	//-----------------------------------------------------------------------------
	25	// thread system
	26	//-----------------------------------------------------------------------------
	27
	28	#if wxUSE_THREADS
	29	extern void wxapp_install_thread_wakeup();
	30	extern void wxapp_uninstall_thread_wakeup();
	31	#endif
	32
	33	//-----------------------------------------------------------------------------
	34	// data
	35	//-----------------------------------------------------------------------------
	36
	37	wxClipboard wxTheClipboard = (wxClipboard) NULL;
	38
	39	GdkAtom g_clipboardAtom = 0;
	40	GdkAtom g_targetsAtom = 0;
	41
	42	//-----------------------------------------------------------------------------
	43	// reminder
	44	//-----------------------------------------------------------------------------
	45
	46	/* The contents of a selection are returned in a GtkSelectionData
	47	structure. selection/target identify the request.
	48	type specifies the type of the return; if length < 0, and
	49	the data should be ignored. This structure has object semantics -
	50	no fields should be modified directly, they should not be created
	51	directly, and pointers to them should not be stored beyond the duration of
	52	a callback. (If the last is changed, we'll need to add reference
	53	counting)
	54
	55	struct _GtkSelectionData
	56	{
	57	GdkAtom selection;
	58	GdkAtom target;
	59	GdkAtom type;
	60	gint format;
	61	guchar *data;
	62	gint length;
	63	};
	64
	65	*/
	66
	67	//-----------------------------------------------------------------------------
	68	// "selection_received" for targets
	69	//-----------------------------------------------------------------------------
	70
	71	static void
	72	targets_selection_received( GtkWidget *WXUNUSED(widget),
	73	GtkSelectionData *selection_data,
	74	#if (GTK_MINOR_VERSION > 0)
	75	guint32 WXUNUSED(time),
	76	#endif
	77	wxClipboard *clipboard )
	78	{
	79	if (!wxTheClipboard)
	80	{
	81	clipboard->m_waiting = FALSE;
	82	return;
	83	}
	84
	85	if (selection_data->length <= 0)
	86	{
	87	clipboard->m_waiting = FALSE;
	88	return;
	89	}
	90
	91	/* make sure we got the data in the correct form */
	92	if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
	93	{
	94	clipboard->m_waiting = FALSE;
	95	return;
	96	}
	97
	98	// the atoms we received, holding a list of targets (= formats)
	99	GdkAtom atoms = (GdkAtom )selection_data->data;
	100
	101	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	102	{
	103	/* char *name = gdk_atom_name (atoms[i]);
	104	if (name) printf( "Format available: %s.\n", name ); */
	105
	106	if (atoms[i] == clipboard->m_targetRequested)
	107	{
	108	clipboard->m_waiting = FALSE;
	109	clipboard->m_formatSupported = TRUE;
	110	return;
	111	}
	112	}
	113
	114	clipboard->m_waiting = FALSE;
	115	return;
	116	}
	117
	118	//-----------------------------------------------------------------------------
	119	// "selection_received" for the actual data
	120	//-----------------------------------------------------------------------------
	121
	122	static void
	123	selection_received( GtkWidget *WXUNUSED(widget),
	124	GtkSelectionData *selection_data,
	125	#if (GTK_MINOR_VERSION > 0)
	126	guint32 WXUNUSED(time),
	127	#endif
	128	wxClipboard *clipboard )
	129	{
	130	if (!wxTheClipboard)
	131	{
	132	clipboard->m_waiting = FALSE;
	133	return;
	134	}
	135
	136	wxDataObject *data_object = clipboard->m_receivedData;
	137
	138	if (!data_object)
	139	{
	140	clipboard->m_waiting = FALSE;
	141	return;
	142	}
	143
	144	if (selection_data->length <= 0)
	145	{
	146	clipboard->m_waiting = FALSE;
	147	return;
	148	}
	149
	150	/* make sure we got the data in the correct format */
	151	if (data_object->GetFormat().GetAtom() != selection_data->target)
	152	{
	153	clipboard->m_waiting = FALSE;
	154	return;
	155	}
	156
	157	/* make sure we got the data in the correct form (selection type).
	158	if so, copy data to target object */
	159
	160	switch (data_object->GetFormat().GetType())
	161	{
	162	case wxDF_TEXT:
	163	{
	164	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	165	{
	166	clipboard->m_waiting = FALSE;
	167	return;
	168	}
	169
	170	wxTextDataObject text_object = (wxTextDataObject ) data_object;
	171
	172	wxString text = (const char*) selection_data->data;
	173
	174	text_object->SetText( text );
	175
	176	break;
	177	}
	178
	179	case wxDF_BITMAP:
	180	{
	181	if (selection_data->type != GDK_SELECTION_TYPE_BITMAP)
	182	{
	183	clipboard->m_waiting = FALSE;
	184	return;
	185	}
	186
	187	break;
	188	}
	189
	190	case wxDF_PRIVATE:
	191	{
	192	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	193	{
	194	clipboard->m_waiting = FALSE;
	195	return;
	196	}
	197
	198	wxPrivateDataObject private_object = (wxPrivateDataObject ) data_object;
	199
	200	private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
	201
	202	break;
	203	}
	204
	205	default:
	206	{
	207	clipboard->m_waiting = FALSE;
	208	return;
	209	}
	210	}
	211
	212	wxTheClipboard->m_formatSupported = TRUE;
	213	clipboard->m_waiting = FALSE;
	214	}
	215
	216	//-----------------------------------------------------------------------------
	217	// "selection_clear"
	218	//-----------------------------------------------------------------------------
	219
	220	static gint
	221	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	222	{
	223	if (!wxTheClipboard) return TRUE;
	224
	225	if (event->selection == GDK_SELECTION_PRIMARY)
	226	{
	227	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	228	}
	229	else
	230	if (event->selection == g_clipboardAtom)
	231	{
	232	wxTheClipboard->m_ownsClipboard = FALSE;
	233	}
	234	else
	235	{
	236	wxTheClipboard->m_waiting = FALSE;
	237	return FALSE;
	238	}
	239
	240	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	241	(!wxTheClipboard->m_ownsClipboard))
	242	{
	243	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	244	if (wxTheClipboard->m_dataBroker)
	245	{
	246	delete wxTheClipboard->m_dataBroker;
	247	wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	248	}
	249	}
	250
	251	wxTheClipboard->m_waiting = FALSE;
	252	return TRUE;
	253	}
	254
	255	//-----------------------------------------------------------------------------
	256	// selection handler for supplying data
	257	//-----------------------------------------------------------------------------
	258
	259	static void
	260	selection_handler( GtkWidget WXUNUSED(widget), GtkSelectionData selection_data, gpointer WXUNUSED(data) )
	261	{
	262	if (!wxTheClipboard) return;
	263
	264	if (!wxTheClipboard->m_dataBroker) return;
	265
	266	wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();
	267
	268	while (node)
	269	{
	270	wxDataObject data_object = (wxDataObject )node->Data();
	271
	272	if (data_object->GetFormat().GetAtom() != selection_data->target)
	273	{
	274	node = node->Next();
	275	continue;
	276	}
	277
	278	switch (data_object->GetFormat().GetType())
	279	{
	280	case wxDF_TEXT:
	281	{
	282	wxTextDataObject text_object = (wxTextDataObject) data_object;
	283
	284	wxString text = text_object->GetText();
	285
	286	#if wxUSE_UNICODE
	287	const wxWX2MBbuf s = text.mbc_str();
	288	int len = strlen(s);
	289	#else // more efficient in non-Unicode
	290	const char *s = text.c_str();
	291	int len = (int) text.Length();
	292	#endif
	293
	294	gtk_selection_data_set(
	295	selection_data,
	296	GDK_SELECTION_TYPE_STRING,
	297	8*sizeof(gchar),
	298	(unsigned char) (const char) s,
	299	len );
	300
	301	break;
	302	}
	303
	304	case wxDF_BITMAP:
	305	{
	306	// wxBitmapDataObject private_object = (wxBitmapDataObject) data_object;
	307
	308	// how do we do that ?
	309
	310	break;
	311	}
	312
	313	case wxDF_PRIVATE:
	314	{
	315	wxPrivateDataObject private_object = (wxPrivateDataObject) data_object;
	316
	317	if (private_object->GetSize() == 0) return;
	318
	319	gtk_selection_data_set(
	320	selection_data,
	321	GDK_SELECTION_TYPE_STRING,
	322	8*sizeof(gchar),
	323	(unsigned char*) private_object->GetData(),
	324	(int) private_object->GetSize() );
	325	}
	326
	327	default:
	328	break;
	329	}
	330
	331	node = node->Next();
	332	}
	333	}
	334
	335	//-----------------------------------------------------------------------------
	336	// wxClipboard
	337	//-----------------------------------------------------------------------------
	338
	339	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	340
	341	wxClipboard::wxClipboard()
	342	{
	343	m_open = FALSE;
	344
	345	m_ownsClipboard = FALSE;
	346	m_ownsPrimarySelection = FALSE;
	347
	348	m_dataBroker = (wxDataBroker*) NULL;
	349
	350	m_receivedData = (wxDataObject*) NULL;
	351
	352	/* we use m_targetsWidget to query what formats are available */
	353
	354	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	355	gtk_widget_realize( m_targetsWidget );
	356
	357	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	358	"selection_received",
	359	GTK_SIGNAL_FUNC( targets_selection_received ),
	360	(gpointer) this );
	361
	362	/* we use m_clipboardWidget to get and to offer data */
	363
	364	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	365	gtk_widget_realize( m_clipboardWidget );
	366
	367	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	368	"selection_received",
	369	GTK_SIGNAL_FUNC( selection_received ),
	370	(gpointer) this );
	371
	372	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	373	"selection_clear_event",
	374	GTK_SIGNAL_FUNC( selection_clear_clip ),
	375	(gpointer) NULL );
	376
	377	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	378	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	379
	380	m_formatSupported = FALSE;
	381	m_targetRequested = 0;
	382
	383	m_usePrimary = FALSE;
	384	}
	385
	386	wxClipboard::~wxClipboard()
	387	{
	388	Clear();
	389
	390	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	391	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	392	}
	393
	394	void wxClipboard::Clear()
	395	{
	396	if (m_dataBroker)
	397	{
	398	#if wxUSE_THREADS
	399	/* disable GUI threads */
	400	wxapp_uninstall_thread_wakeup();
	401	#endif
	402
	403	/* As we have data we also own the clipboard. Once we no longer own
	404	it, clear_selection is called which will set m_data to zero */
	405	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	406	{
	407	m_waiting = TRUE;
	408
	409	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	410
	411	while (m_waiting) gtk_main_iteration();
	412	}
	413
	414	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	415	{
	416	m_waiting = TRUE;
	417
	418	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	419
	420	while (m_waiting) gtk_main_iteration();
	421	}
	422
	423	if (m_dataBroker)
	424	{
	425	delete m_dataBroker;
	426	m_dataBroker = (wxDataBroker*) NULL;
	427	}
	428
	429	#if wxUSE_THREADS
	430	/* re-enable GUI threads */
	431	wxapp_install_thread_wakeup();
	432	#endif
	433	}
	434
	435	m_targetRequested = 0;
	436
	437	m_formatSupported = FALSE;
	438	}
	439
	440	bool wxClipboard::Open()
	441	{
	442	wxCHECK_MSG( !m_open, FALSE, _T("clipboard already open") );
	443
	444	m_open = TRUE;
	445
	446	return TRUE;
	447	}
	448
	449	bool wxClipboard::SetData( wxDataObject *data )
	450	{
	451	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	452
	453	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	454
	455	Clear();
	456
	457	return AddData( data );
	458	}
	459
	460	bool wxClipboard::AddData( wxDataObject *data )
	461	{
	462	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	463
	464	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	465
	466	/* if clipboard has been cleared before, create new data broker */
	467	if (!m_dataBroker) m_dataBroker = new wxDataBroker();
	468
	469	/* add new data to list of offered data objects */
	470	m_dataBroker->Add( data );
	471
	472	/* get native format id of new data object */
	473	GdkAtom format = data->GetFormat().GetAtom();
	474
	475	wxCHECK_MSG( format, FALSE, _T("data has invalid format") );
	476
	477	/* This should happen automatically, but to be on the safe side */
	478	m_ownsClipboard = FALSE;
	479	m_ownsPrimarySelection = FALSE;
	480
	481	/* Add handlers if someone requests data */
	482
	483	#if (GTK_MINOR_VERSION > 0)
	484
	485	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	486	GDK_SELECTION_PRIMARY,
	487	format,
	488	0 ); /* what is info ? */
	489
	490	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	491	g_clipboardAtom,
	492	format,
	493	0 ); /* what is info ? */
	494
	495	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	496	"selection_get",
	497	GTK_SIGNAL_FUNC(selection_handler),
	498	(gpointer) NULL );
	499
	500	#else
	501
	502	gtk_selection_add_handler( m_clipboardWidget,
	503	g_clipboardAtom,
	504	format,
	505	selection_handler,
	506	(gpointer) NULL );
	507
	508	gtk_selection_add_handler( m_clipboardWidget,
	509	GDK_SELECTION_PRIMARY,
	510	format,
	511	selection_handler,
	512	(gpointer) NULL );
	513	#endif
	514
	515	#if wxUSE_THREADS
	516	/* disable GUI threads */
	517	wxapp_uninstall_thread_wakeup();
	518	#endif
	519
	520	/* Tell the world we offer clipboard data */
	521	if (!gtk_selection_owner_set( m_clipboardWidget,
	522	g_clipboardAtom,
	523	GDK_CURRENT_TIME ))
	524	{
	525	#if wxUSE_THREADS
	526	/* re-enable GUI threads */
	527	wxapp_install_thread_wakeup();
	528	#endif
	529	return FALSE;
	530	}
	531	m_ownsClipboard = TRUE;
	532
	533	if (!gtk_selection_owner_set( m_clipboardWidget,
	534	GDK_SELECTION_PRIMARY,
	535	GDK_CURRENT_TIME ))
	536	{
	537	#if wxUSE_THREADS
	538	/* re-enable GUI threads */
	539	wxapp_install_thread_wakeup();
	540	#endif
	541	return FALSE;
	542	}
	543	m_ownsPrimarySelection = TRUE;
	544
	545	#if wxUSE_THREADS
	546	/* re-enable GUI threads */
	547	wxapp_install_thread_wakeup();
	548	#endif
	549
	550	return TRUE;
	551	}
	552
	553	void wxClipboard::Close()
	554	{
	555	wxCHECK_RET( m_open, _T("clipboard not open") );
	556
	557	m_open = FALSE;
	558	}
	559
	560	bool wxClipboard::IsSupported( wxDataFormat format )
	561	{
	562	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	563
	564	/* store requested format to be asked for by callbacks */
	565
	566	m_targetRequested = format.GetAtom();
	567
	568	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	569
	570	m_formatSupported = FALSE;
	571
	572	/* perform query. this will set m_formatSupported to
	573	TRUE if m_targetRequested is supported.
	574	alsom we have to wait for the "answer" from the
	575	clipboard owner which is an asynchronous process.
	576	therefore we set m_waiting = TRUE here and wait
	577	until the callback "targets_selection_received"
	578	sets it to FALSE */
	579
	580	m_waiting = TRUE;
	581
	582	gtk_selection_convert( m_targetsWidget,
	583	m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
	584	g_targetsAtom,
	585	GDK_CURRENT_TIME );
	586
	587	while (m_waiting) gtk_main_iteration();
	588
	589	if (!m_formatSupported) return FALSE;
	590
	591	return TRUE;
	592	}
	593
	594	bool wxClipboard::GetData( wxDataObject *data )
	595	{
	596	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	597
	598	/* is data supported by clipboard ? */
	599
	600	if (!IsSupported( data->GetFormat() )) return FALSE;
	601
	602	/* store pointer to data object to be filled up by callbacks */
	603
	604	m_receivedData = data;
	605
	606	/* store requested format to be asked for by callbacks */
	607
	608	m_targetRequested = data->GetFormat().GetAtom();
	609
	610	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	611
	612	/* start query */
	613
	614	m_formatSupported = FALSE;
	615
	616	/* ask for clipboard contents. this will set
	617	m_formatSupported to TRUE if m_targetRequested
	618	is supported.
	619	also, we have to wait for the "answer" from the
	620	clipboard owner which is an asynchronous process.
	621	therefore we set m_waiting = TRUE here and wait
	622	until the callback "targets_selection_received"
	623	sets it to FALSE */
	624
	625	m_waiting = TRUE;
	626
	627	gtk_selection_convert( m_clipboardWidget,
	628	m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
	629	m_targetRequested,
	630	GDK_CURRENT_TIME );
	631
	632	while (m_waiting) gtk_main_iteration();
	633
	634	/* this is a true error as we checked for the presence of such data before */
	635
	636	wxCHECK_MSG( m_formatSupported, FALSE, _T("error retrieving data from clipboard") );
	637
	638	return TRUE;
	639	}
	640
	641	//-----------------------------------------------------------------------------
	642	// wxClipboardModule
	643	//-----------------------------------------------------------------------------
	644
	645	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	646
	647	bool wxClipboardModule::OnInit()
	648	{
	649	wxTheClipboard = new wxClipboard();
	650
	651	return TRUE;
	652	}
	653
	654	void wxClipboardModule::OnExit()
	655	{
	656	if (wxTheClipboard) delete wxTheClipboard;
	657	wxTheClipboard = (wxClipboard*) NULL;
	658	}
	659
	660	#endif
	661
	662	// wxUSE_CLIPBOARD
	663