src/gtk/clipbrd.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        gtk/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/dataobj.h"
#include "wx/utils.h"
#include "wx/log.h"

#include <glib.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>

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

#if wxUSE_THREADS
#endif

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

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;

// the trace mask we use with wxLogTrace() - call
// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
// (there will be a *lot* of them!)
static const wxChar *TRACE_CLIPBOARD = _T("clipboard");

//-----------------------------------------------------------------------------
// 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 && selection_data->length > 0 )
    {
        /* make sure we got the data in the correct form */
        GdkAtom type = selection_data->type;
        if ( type != GDK_SELECTION_TYPE_ATOM )
        {
            if ( strcmp(gdk_atom_name(type), "TARGETS") )
            {
                wxLogTrace( TRACE_CLIPBOARD,
                            _T("got unsupported clipboard target") );

                clipboard->m_waiting = FALSE;
                return;
            }
        }

#ifdef __WXDEBUG__
        wxDataFormat clip( selection_data->selection );
        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("selection received for targets, clipboard %s"),
                    clip.GetId().c_str() );
#endif // __WXDEBUG__

        // 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++)
        {
            wxDataFormat format( atoms[i] );

            wxLogTrace( TRACE_CLIPBOARD,
                        wxT("selection received for targets, format %s"),
                        format.GetId().c_str() );

            if (format == clipboard->m_targetRequested)
            {
                clipboard->m_waiting = FALSE;
                clipboard->m_formatSupported = TRUE;
                return;
            }
        }
    }

    clipboard->m_waiting = FALSE;
}

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

    wxDataFormat format( selection_data->target );

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

    /* make sure we got the data in the correct form (selection type).
       if so, copy data to target object */
    if (selection_data->type != GDK_SELECTION_TYPE_STRING)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

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

    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_data)
        {
            wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));

            delete wxTheClipboard->m_data;
            wxTheClipboard->m_data = (wxDataObject*) NULL;
        }
    }

    wxTheClipboard->m_waiting = FALSE;
    return TRUE;
}

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

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

    if (!wxTheClipboard->m_data) return;

    wxDataObject *data = wxTheClipboard->m_data;

    wxDataFormat format( selection_data->target );

    if (!data->IsSupportedFormat( format )) return;

    int size = data->GetDataSize( format );

    if (size == 0) return;

    void *d = malloc(size);

    data->GetDataHere( selection_data->target, d );

    // transform Unicode text into multibyte before putting it on clipboard
#if wxUSE_UNICODE
    if ( format.GetType() == wxDF_TEXT )
    {
        const wchar_t *wstr = (const wchar_t *)d;
        size_t len = wxConvCurrent->WC2MB(NULL, wstr, 0);
        char *str = malloc(len + 1);
        wxConvCurrent->WC2MB(str, wstr, len);
        str[len] = '\0';

        free(d);
        d = str;
    }
#endif // wxUSE_UNICODE

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

    free(d);
}

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_data = (wxDataObject*) 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_data)
    {
#if wxUSE_THREADS
        /* disable GUI threads */
#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,
                                     (guint32) 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,
                                     (guint32) GDK_CURRENT_TIME );

            while (m_waiting) gtk_main_iteration();
        }

        if (m_data)
        {
            delete m_data;
            m_data = (wxDataObject*) NULL;
        }

#if wxUSE_THREADS
        /* re-enable GUI threads */
#endif
    }

    m_targetRequested = 0;
    m_formatSupported = FALSE;
}

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

    m_open = TRUE;

    return TRUE;
}

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

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

    Clear();

    return AddData( data );
}

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

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

    /* we can only store one wxDataObject */
    Clear();

    m_data = data;

    /* get formats from wxDataObjects */
    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
    m_data->GetAllFormats( array );

    /* primary selection or clipboard */
    GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
                                     : g_clipboardAtom;


    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
    {
        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("wxClipboard now supports atom %s"),
                    array[i].GetId().c_str() );

        gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                                  clipboard,
                                  array[i],
                                  0 );  /* what is info ? */
    }

    delete[] array;

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

#if wxUSE_THREADS
    /* disable GUI threads */
#endif

    /* Tell the world we offer clipboard data */
    bool res = (gtk_selection_owner_set( m_clipboardWidget,
                                         clipboard,
                                         (guint32) GDK_CURRENT_TIME ));

    if (m_usePrimary)
        m_ownsPrimarySelection = res;
    else
        m_ownsClipboard = res;

#if wxUSE_THREADS
    /* re-enable GUI threads */
#endif

    return res;
}

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

    m_open = FALSE;
}

bool wxClipboard::IsOpened() const
{
    return m_open;
}

bool wxClipboard::IsSupported( const wxDataFormat& format )
{
    /* reentrance problems */
    if (m_waiting) return FALSE;

    /* store requested format to be asked for by callbacks */
    m_targetRequested = format;

#if 0
    wxLogTrace( TRACE_CLIPBOARD,
                wxT("wxClipboard:IsSupported: requested format: %s"),
                format.GetId().c_str() );
#endif

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

    m_formatSupported = FALSE;

    /* perform query. 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_targetsWidget,
                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
                                        : g_clipboardAtom,
                           g_targetsAtom,
                           (guint32) 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, wxT("clipboard not open") );

    /* get formats from wxDataObjects */
    wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
    data.GetAllFormats( array );

    for (size_t i = 0; i < data.GetFormatCount(); i++)
    {
        wxDataFormat format( array[i] );

        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("wxClipboard::GetData: requested format: %s"),
                    format.GetId().c_str() );

        /* is data supported by clipboard ? */

        /* store requested format to be asked for by callbacks */
        m_targetRequested = format;

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

        m_formatSupported = FALSE;

       /* perform query. 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_targetsWidget,
                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
                                        : g_clipboardAtom,
                           g_targetsAtom,
                           (guint32) GDK_CURRENT_TIME );

        while (m_waiting) gtk_main_iteration();

        if (!m_formatSupported) continue;

        /* 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 = format;

        wxCHECK_MSG( m_targetRequested, FALSE, wxT("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;

        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("wxClipboard::GetData: format found, start convert") );

        gtk_selection_convert( m_clipboardWidget,
                               m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
                                            : g_clipboardAtom,
                               m_targetRequested,
                               (guint32) 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, wxT("error retrieving data from clipboard") );

        /* return success */
        delete[] array;
        return TRUE;
    }

    wxLogTrace( TRACE_CLIPBOARD,
                wxT("wxClipboard::GetData: format not found") );

    /* return failure */
    delete[] array;
    return FALSE;
}

#endif
  // wxUSE_CLIPBOARD
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: gtk/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/dataobj.h"
	19	#include "wx/utils.h"
	20	#include "wx/log.h"
	21
	22	#include <glib.h>
	23	#include <gdk/gdk.h>
	24	#include <gtk/gtk.h>
	25
	26	//-----------------------------------------------------------------------------
	27	// thread system
	28	//-----------------------------------------------------------------------------
	29
	30	#if wxUSE_THREADS
	31	#endif
	32
	33	//-----------------------------------------------------------------------------
	34	// data
	35	//-----------------------------------------------------------------------------
	36
	37	GdkAtom g_clipboardAtom = 0;
	38	GdkAtom g_targetsAtom = 0;
	39
	40	// the trace mask we use with wxLogTrace() - call
	41	// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
	42	// (there will be a lot of them!)
	43	static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
	44
	45	//-----------------------------------------------------------------------------
	46	// reminder
	47	//-----------------------------------------------------------------------------
	48
	49	/* The contents of a selection are returned in a GtkSelectionData
	50	structure. selection/target identify the request.
	51	type specifies the type of the return; if length < 0, and
	52	the data should be ignored. This structure has object semantics -
	53	no fields should be modified directly, they should not be created
	54	directly, and pointers to them should not be stored beyond the duration of
	55	a callback. (If the last is changed, we'll need to add reference
	56	counting)
	57
	58	struct _GtkSelectionData
	59	{
	60	GdkAtom selection;
	61	GdkAtom target;
	62	GdkAtom type;
	63	gint format;
	64	guchar *data;
	65	gint length;
	66	};
	67
	68	*/
	69
	70	//-----------------------------------------------------------------------------
	71	// "selection_received" for targets
	72	//-----------------------------------------------------------------------------
	73
	74	static void
	75	targets_selection_received( GtkWidget *WXUNUSED(widget),
	76	GtkSelectionData *selection_data,
	77	#if (GTK_MINOR_VERSION > 0)
	78	guint32 WXUNUSED(time),
	79	#endif
	80	wxClipboard *clipboard )
	81	{
	82	if ( wxTheClipboard && selection_data->length > 0 )
	83	{
	84	/* make sure we got the data in the correct form */
	85	GdkAtom type = selection_data->type;
	86	if ( type != GDK_SELECTION_TYPE_ATOM )
	87	{
	88	if ( strcmp(gdk_atom_name(type), "TARGETS") )
	89	{
	90	wxLogTrace( TRACE_CLIPBOARD,
	91	_T("got unsupported clipboard target") );
	92
	93	clipboard->m_waiting = FALSE;
	94	return;
	95	}
	96	}
	97
	98	#ifdef __WXDEBUG__
	99	wxDataFormat clip( selection_data->selection );
	100	wxLogTrace( TRACE_CLIPBOARD,
	101	wxT("selection received for targets, clipboard %s"),
	102	clip.GetId().c_str() );
	103	#endif // __WXDEBUG__
	104
	105	// the atoms we received, holding a list of targets (= formats)
	106	GdkAtom atoms = (GdkAtom )selection_data->data;
	107
	108	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	109	{
	110	wxDataFormat format( atoms[i] );
	111
	112	wxLogTrace( TRACE_CLIPBOARD,
	113	wxT("selection received for targets, format %s"),
	114	format.GetId().c_str() );
	115
	116	if (format == clipboard->m_targetRequested)
	117	{
	118	clipboard->m_waiting = FALSE;
	119	clipboard->m_formatSupported = TRUE;
	120	return;
	121	}
	122	}
	123	}
	124
	125	clipboard->m_waiting = FALSE;
	126	}
	127
	128	//-----------------------------------------------------------------------------
	129	// "selection_received" for the actual data
	130	//-----------------------------------------------------------------------------
	131
	132	static void
	133	selection_received( GtkWidget *WXUNUSED(widget),
	134	GtkSelectionData *selection_data,
	135	#if (GTK_MINOR_VERSION > 0)
	136	guint32 WXUNUSED(time),
	137	#endif
	138	wxClipboard *clipboard )
	139	{
	140	if (!wxTheClipboard)
	141	{
	142	clipboard->m_waiting = FALSE;
	143	return;
	144	}
	145
	146	wxDataObject *data_object = clipboard->m_receivedData;
	147
	148	if (!data_object)
	149	{
	150	clipboard->m_waiting = FALSE;
	151	return;
	152	}
	153
	154	if (selection_data->length <= 0)
	155	{
	156	clipboard->m_waiting = FALSE;
	157	return;
	158	}
	159
	160	wxDataFormat format( selection_data->target );
	161
	162	/* make sure we got the data in the correct format */
	163	if (!data_object->IsSupportedFormat( format ) )
	164	{
	165	clipboard->m_waiting = FALSE;
	166	return;
	167	}
	168
	169	/* make sure we got the data in the correct form (selection type).
	170	if so, copy data to target object */
	171	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	172	{
	173	clipboard->m_waiting = FALSE;
	174	return;
	175	}
	176
	177	data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
	178
	179	wxTheClipboard->m_formatSupported = TRUE;
	180	clipboard->m_waiting = FALSE;
	181	}
	182
	183	//-----------------------------------------------------------------------------
	184	// "selection_clear"
	185	//-----------------------------------------------------------------------------
	186
	187	static gint
	188	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	189	{
	190	if (!wxTheClipboard) return TRUE;
	191
	192	if (event->selection == GDK_SELECTION_PRIMARY)
	193	{
	194	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	195	}
	196	else
	197	if (event->selection == g_clipboardAtom)
	198	{
	199	wxTheClipboard->m_ownsClipboard = FALSE;
	200	}
	201	else
	202	{
	203	wxTheClipboard->m_waiting = FALSE;
	204	return FALSE;
	205	}
	206
	207	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	208	(!wxTheClipboard->m_ownsClipboard))
	209	{
	210	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	211	if (wxTheClipboard->m_data)
	212	{
	213	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	214
	215	delete wxTheClipboard->m_data;
	216	wxTheClipboard->m_data = (wxDataObject*) NULL;
	217	}
	218	}
	219
	220	wxTheClipboard->m_waiting = FALSE;
	221	return TRUE;
	222	}
	223
	224	//-----------------------------------------------------------------------------
	225	// selection handler for supplying data
	226	//-----------------------------------------------------------------------------
	227
	228	static void
	229	selection_handler( GtkWidget *WXUNUSED(widget),
	230	GtkSelectionData *selection_data,
	231	guint WXUNUSED(info),
	232	guint WXUNUSED(time),
	233	gpointer WXUNUSED(data) )
	234	{
	235	if (!wxTheClipboard) return;
	236
	237	if (!wxTheClipboard->m_data) return;
	238
	239	wxDataObject *data = wxTheClipboard->m_data;
	240
	241	wxDataFormat format( selection_data->target );
	242
	243	if (!data->IsSupportedFormat( format )) return;
	244
	245	int size = data->GetDataSize( format );
	246
	247	if (size == 0) return;
	248
	249	void *d = malloc(size);
	250
	251	data->GetDataHere( selection_data->target, d );
	252
	253	// transform Unicode text into multibyte before putting it on clipboard
	254	#if wxUSE_UNICODE
	255	if ( format.GetType() == wxDF_TEXT )
	256	{
	257	const wchar_t wstr = (const wchar_t )d;
	258	size_t len = wxConvCurrent->WC2MB(NULL, wstr, 0);
	259	char *str = malloc(len + 1);
	260	wxConvCurrent->WC2MB(str, wstr, len);
	261	str[len] = '\0';
	262
	263	free(d);
	264	d = str;
	265	}
	266	#endif // wxUSE_UNICODE
	267
	268	gtk_selection_data_set(
	269	selection_data,
	270	GDK_SELECTION_TYPE_STRING,
	271	8*sizeof(gchar),
	272	(unsigned char*) d,
	273	size );
	274
	275	free(d);
	276	}
	277
	278	//-----------------------------------------------------------------------------
	279	// wxClipboard
	280	//-----------------------------------------------------------------------------
	281
	282	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	283
	284	wxClipboard::wxClipboard()
	285	{
	286	m_open = FALSE;
	287
	288	m_ownsClipboard = FALSE;
	289	m_ownsPrimarySelection = FALSE;
	290
	291	m_data = (wxDataObject*) NULL;
	292	m_receivedData = (wxDataObject*) NULL;
	293
	294	/* we use m_targetsWidget to query what formats are available */
	295
	296	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	297	gtk_widget_realize( m_targetsWidget );
	298
	299	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	300	"selection_received",
	301	GTK_SIGNAL_FUNC( targets_selection_received ),
	302	(gpointer) this );
	303
	304	/* we use m_clipboardWidget to get and to offer data */
	305
	306	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	307	gtk_widget_realize( m_clipboardWidget );
	308
	309	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	310	"selection_received",
	311	GTK_SIGNAL_FUNC( selection_received ),
	312	(gpointer) this );
	313
	314	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	315	"selection_clear_event",
	316	GTK_SIGNAL_FUNC( selection_clear_clip ),
	317	(gpointer) NULL );
	318
	319	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	320	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	321
	322	m_formatSupported = FALSE;
	323	m_targetRequested = 0;
	324
	325	m_usePrimary = FALSE;
	326	}
	327
	328	wxClipboard::~wxClipboard()
	329	{
	330	Clear();
	331
	332	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	333	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	334	}
	335
	336	void wxClipboard::Clear()
	337	{
	338	if (m_data)
	339	{
	340	#if wxUSE_THREADS
	341	/* disable GUI threads */
	342	#endif
	343
	344	/* As we have data we also own the clipboard. Once we no longer own
	345	it, clear_selection is called which will set m_data to zero */
	346	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	347	{
	348	m_waiting = TRUE;
	349
	350	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	351	(guint32) GDK_CURRENT_TIME );
	352
	353	while (m_waiting) gtk_main_iteration();
	354	}
	355
	356	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	357	{
	358	m_waiting = TRUE;
	359
	360	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	361	(guint32) GDK_CURRENT_TIME );
	362
	363	while (m_waiting) gtk_main_iteration();
	364	}
	365
	366	if (m_data)
	367	{
	368	delete m_data;
	369	m_data = (wxDataObject*) NULL;
	370	}
	371
	372	#if wxUSE_THREADS
	373	/* re-enable GUI threads */
	374	#endif
	375	}
	376
	377	m_targetRequested = 0;
	378	m_formatSupported = FALSE;
	379	}
	380
	381	bool wxClipboard::Open()
	382	{
	383	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	384
	385	m_open = TRUE;
	386
	387	return TRUE;
	388	}
	389
	390	bool wxClipboard::SetData( wxDataObject *data )
	391	{
	392	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	393
	394	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	395
	396	Clear();
	397
	398	return AddData( data );
	399	}
	400
	401	bool wxClipboard::AddData( wxDataObject *data )
	402	{
	403	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	404
	405	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	406
	407	/* we can only store one wxDataObject */
	408	Clear();
	409
	410	m_data = data;
	411
	412	/* get formats from wxDataObjects */
	413	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	414	m_data->GetAllFormats( array );
	415
	416	/* primary selection or clipboard */
	417	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	418	: g_clipboardAtom;
	419
	420
	421	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	422	{
	423	wxLogTrace( TRACE_CLIPBOARD,
	424	wxT("wxClipboard now supports atom %s"),
	425	array[i].GetId().c_str() );
	426
	427	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	428	clipboard,
	429	array[i],
	430	0 ); /* what is info ? */
	431	}
	432
	433	delete[] array;
	434
	435	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	436	"selection_get",
	437	GTK_SIGNAL_FUNC(selection_handler),
	438	(gpointer) NULL );
	439
	440	#if wxUSE_THREADS
	441	/* disable GUI threads */
	442	#endif
	443
	444	/* Tell the world we offer clipboard data */
	445	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	446	clipboard,
	447	(guint32) GDK_CURRENT_TIME ));
	448
	449	if (m_usePrimary)
	450	m_ownsPrimarySelection = res;
	451	else
	452	m_ownsClipboard = res;
	453
	454	#if wxUSE_THREADS
	455	/* re-enable GUI threads */
	456	#endif
	457
	458	return res;
	459	}
	460
	461	void wxClipboard::Close()
	462	{
	463	wxCHECK_RET( m_open, wxT("clipboard not open") );
	464
	465	m_open = FALSE;
	466	}
	467
	468	bool wxClipboard::IsOpened() const
	469	{
	470	return m_open;
	471	}
	472
	473	bool wxClipboard::IsSupported( const wxDataFormat& format )
	474	{
	475	/* reentrance problems */
	476	if (m_waiting) return FALSE;
	477
	478	/* store requested format to be asked for by callbacks */
	479	m_targetRequested = format;
	480
	481	#if 0
	482	wxLogTrace( TRACE_CLIPBOARD,
	483	wxT("wxClipboard:IsSupported: requested format: %s"),
	484	format.GetId().c_str() );
	485	#endif
	486
	487	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	488
	489	m_formatSupported = FALSE;
	490
	491	/* perform query. this will set m_formatSupported to
	492	TRUE if m_targetRequested is supported.
	493	also, we have to wait for the "answer" from the
	494	clipboard owner which is an asynchronous process.
	495	therefore we set m_waiting = TRUE here and wait
	496	until the callback "targets_selection_received"
	497	sets it to FALSE */
	498
	499	m_waiting = TRUE;
	500
	501	gtk_selection_convert( m_targetsWidget,
	502	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	503	: g_clipboardAtom,
	504	g_targetsAtom,
	505	(guint32) GDK_CURRENT_TIME );
	506
	507	while (m_waiting) gtk_main_iteration();
	508
	509	if (!m_formatSupported) return FALSE;
	510
	511	return TRUE;
	512	}
	513
	514	bool wxClipboard::GetData( wxDataObject& data )
	515	{
	516	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	517
	518	/* get formats from wxDataObjects */
	519	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	520	data.GetAllFormats( array );
	521
	522	for (size_t i = 0; i < data.GetFormatCount(); i++)
	523	{
	524	wxDataFormat format( array[i] );
	525
	526	wxLogTrace( TRACE_CLIPBOARD,
	527	wxT("wxClipboard::GetData: requested format: %s"),
	528	format.GetId().c_str() );
	529
	530	/* is data supported by clipboard ? */
	531
	532	/* store requested format to be asked for by callbacks */
	533	m_targetRequested = format;
	534
	535	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	536
	537	m_formatSupported = FALSE;
	538
	539	/* perform query. this will set m_formatSupported to
	540	TRUE if m_targetRequested is supported.
	541	also, we have to wait for the "answer" from the
	542	clipboard owner which is an asynchronous process.
	543	therefore we set m_waiting = TRUE here and wait
	544	until the callback "targets_selection_received"
	545	sets it to FALSE */
	546
	547	m_waiting = TRUE;
	548
	549	gtk_selection_convert( m_targetsWidget,
	550	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	551	: g_clipboardAtom,
	552	g_targetsAtom,
	553	(guint32) GDK_CURRENT_TIME );
	554
	555	while (m_waiting) gtk_main_iteration();
	556
	557	if (!m_formatSupported) continue;
	558
	559	/* store pointer to data object to be filled up by callbacks */
	560	m_receivedData = &data;
	561
	562	/* store requested format to be asked for by callbacks */
	563	m_targetRequested = format;
	564
	565	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	566
	567	/* start query */
	568	m_formatSupported = FALSE;
	569
	570	/* ask for clipboard contents. this will set
	571	m_formatSupported to TRUE if m_targetRequested
	572	is supported.
	573	also, we have to wait for the "answer" from the
	574	clipboard owner which is an asynchronous process.
	575	therefore we set m_waiting = TRUE here and wait
	576	until the callback "targets_selection_received"
	577	sets it to FALSE */
	578
	579	m_waiting = TRUE;
	580
	581	wxLogTrace( TRACE_CLIPBOARD,
	582	wxT("wxClipboard::GetData: format found, start convert") );
	583
	584	gtk_selection_convert( m_clipboardWidget,
	585	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	586	: g_clipboardAtom,
	587	m_targetRequested,
	588	(guint32) GDK_CURRENT_TIME );
	589
	590	while (m_waiting) gtk_main_iteration();
	591
	592	/* this is a true error as we checked for the presence of such data before */
	593	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	594
	595	/* return success */
	596	delete[] array;
	597	return TRUE;
	598	}
	599
	600	wxLogTrace( TRACE_CLIPBOARD,
	601	wxT("wxClipboard::GetData: format not found") );
	602
	603	/* return failure */
	604	delete[] array;
	605	return FALSE;
	606	}
	607
	608	#endif
	609	// wxUSE_CLIPBOARD
	610