src/gtk/clipbrd.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        gtk/clipbrd.cpp
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "clipbrd.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#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,
                            guint32 WXUNUSED(time),
                            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() );

//            printf( "format %s requested %s\n",
//                    gdk_atom_name( atoms[i] ),
//                    gdk_atom_name( clipboard->m_targetRequested ) );

            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,
                    guint32 WXUNUSED(time),
                    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);

    // Text data will be in UTF8 in Unicode mode.
    data->GetDataHere( selection_data->target, d );

    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() );

//        printf( "added %s\n",
//                    gdk_atom_name( array[i].GetFormatId() ) );

        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	#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
	11	#pragma implementation "clipbrd.h"
	12	#endif
	13
	14	// For compilers that support precompilation, includes "wx.h".
	15	#include "wx/wxprec.h"
	16
	17	#include "wx/clipbrd.h"
	18
	19	#if wxUSE_CLIPBOARD
	20
	21	#include "wx/dataobj.h"
	22	#include "wx/utils.h"
	23	#include "wx/log.h"
	24
	25	#include <glib.h>
	26	#include <gdk/gdk.h>
	27	#include <gtk/gtk.h>
	28
	29	//-----------------------------------------------------------------------------
	30	// thread system
	31	//-----------------------------------------------------------------------------
	32
	33	#if wxUSE_THREADS
	34	#endif
	35
	36	//-----------------------------------------------------------------------------
	37	// data
	38	//-----------------------------------------------------------------------------
	39
	40	GdkAtom g_clipboardAtom = 0;
	41	GdkAtom g_targetsAtom = 0;
	42
	43	// the trace mask we use with wxLogTrace() - call
	44	// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
	45	// (there will be a lot of them!)
	46	static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
	47
	48	//-----------------------------------------------------------------------------
	49	// reminder
	50	//-----------------------------------------------------------------------------
	51
	52	/* The contents of a selection are returned in a GtkSelectionData
	53	structure. selection/target identify the request.
	54	type specifies the type of the return; if length < 0, and
	55	the data should be ignored. This structure has object semantics -
	56	no fields should be modified directly, they should not be created
	57	directly, and pointers to them should not be stored beyond the duration of
	58	a callback. (If the last is changed, we'll need to add reference
	59	counting)
	60
	61	struct _GtkSelectionData
	62	{
	63	GdkAtom selection;
	64	GdkAtom target;
	65	GdkAtom type;
	66	gint format;
	67	guchar *data;
	68	gint length;
	69	};
	70
	71	*/
	72
	73	//-----------------------------------------------------------------------------
	74	// "selection_received" for targets
	75	//-----------------------------------------------------------------------------
	76
	77	static void
	78	targets_selection_received( GtkWidget *WXUNUSED(widget),
	79	GtkSelectionData *selection_data,
	80	guint32 WXUNUSED(time),
	81	wxClipboard *clipboard )
	82	{
	83	if ( wxTheClipboard && selection_data->length > 0 )
	84	{
	85	// make sure we got the data in the correct form
	86	GdkAtom type = selection_data->type;
	87	if ( type != GDK_SELECTION_TYPE_ATOM )
	88	{
	89	if ( strcmp(gdk_atom_name(type), "TARGETS") )
	90	{
	91	wxLogTrace( TRACE_CLIPBOARD,
	92	_T("got unsupported clipboard target") );
	93
	94	clipboard->m_waiting = FALSE;
	95	return;
	96	}
	97	}
	98
	99	#ifdef __WXDEBUG__
	100	wxDataFormat clip( selection_data->selection );
	101	wxLogTrace( TRACE_CLIPBOARD,
	102	wxT("selection received for targets, clipboard %s"),
	103	clip.GetId().c_str() );
	104	#endif // __WXDEBUG__
	105
	106	// the atoms we received, holding a list of targets (= formats)
	107	GdkAtom atoms = (GdkAtom )selection_data->data;
	108
	109	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	110	{
	111	wxDataFormat format( atoms[i] );
	112
	113	wxLogTrace( TRACE_CLIPBOARD,
	114	wxT("selection received for targets, format %s"),
	115	format.GetId().c_str() );
	116
	117	// printf( "format %s requested %s\n",
	118	// gdk_atom_name( atoms[i] ),
	119	// gdk_atom_name( clipboard->m_targetRequested ) );
	120
	121	if (format == clipboard->m_targetRequested)
	122	{
	123	clipboard->m_waiting = FALSE;
	124	clipboard->m_formatSupported = TRUE;
	125	return;
	126	}
	127	}
	128	}
	129
	130	clipboard->m_waiting = FALSE;
	131	}
	132
	133	//-----------------------------------------------------------------------------
	134	// "selection_received" for the actual data
	135	//-----------------------------------------------------------------------------
	136
	137	static void
	138	selection_received( GtkWidget *WXUNUSED(widget),
	139	GtkSelectionData *selection_data,
	140	guint32 WXUNUSED(time),
	141	wxClipboard *clipboard )
	142	{
	143	if (!wxTheClipboard)
	144	{
	145	clipboard->m_waiting = FALSE;
	146	return;
	147	}
	148
	149	wxDataObject *data_object = clipboard->m_receivedData;
	150
	151	if (!data_object)
	152	{
	153	clipboard->m_waiting = FALSE;
	154	return;
	155	}
	156
	157	if (selection_data->length <= 0)
	158	{
	159	clipboard->m_waiting = FALSE;
	160	return;
	161	}
	162
	163	wxDataFormat format( selection_data->target );
	164
	165	// make sure we got the data in the correct format
	166	if (!data_object->IsSupportedFormat( format ) )
	167	{
	168	clipboard->m_waiting = FALSE;
	169	return;
	170	}
	171
	172	/* make sure we got the data in the correct form (selection type).
	173	if so, copy data to target object */
	174	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	175	{
	176	clipboard->m_waiting = FALSE;
	177	return;
	178	}
	179
	180	data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
	181
	182	wxTheClipboard->m_formatSupported = TRUE;
	183	clipboard->m_waiting = FALSE;
	184	}
	185
	186	//-----------------------------------------------------------------------------
	187	// "selection_clear"
	188	//-----------------------------------------------------------------------------
	189
	190	static gint
	191	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	192	{
	193	if (!wxTheClipboard) return TRUE;
	194
	195	if (event->selection == GDK_SELECTION_PRIMARY)
	196	{
	197	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	198	}
	199	else
	200	if (event->selection == g_clipboardAtom)
	201	{
	202	wxTheClipboard->m_ownsClipboard = FALSE;
	203	}
	204	else
	205	{
	206	wxTheClipboard->m_waiting = FALSE;
	207	return FALSE;
	208	}
	209
	210	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	211	(!wxTheClipboard->m_ownsClipboard))
	212	{
	213	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	214	if (wxTheClipboard->m_data)
	215	{
	216	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	217
	218	delete wxTheClipboard->m_data;
	219	wxTheClipboard->m_data = (wxDataObject*) NULL;
	220	}
	221	}
	222
	223	wxTheClipboard->m_waiting = FALSE;
	224	return TRUE;
	225	}
	226
	227	//-----------------------------------------------------------------------------
	228	// selection handler for supplying data
	229	//-----------------------------------------------------------------------------
	230
	231	static void
	232	selection_handler( GtkWidget *WXUNUSED(widget),
	233	GtkSelectionData *selection_data,
	234	guint WXUNUSED(info),
	235	guint WXUNUSED(time),
	236	gpointer WXUNUSED(data) )
	237	{
	238	if (!wxTheClipboard) return;
	239
	240	if (!wxTheClipboard->m_data) return;
	241
	242	wxDataObject *data = wxTheClipboard->m_data;
	243
	244	wxDataFormat format( selection_data->target );
	245
	246	if (!data->IsSupportedFormat( format )) return;
	247
	248	int size = data->GetDataSize( format );
	249
	250	if (size == 0) return;
	251
	252	void *d = malloc(size);
	253
	254	// Text data will be in UTF8 in Unicode mode.
	255	data->GetDataHere( selection_data->target, d );
	256
	257	gtk_selection_data_set(
	258	selection_data,
	259	GDK_SELECTION_TYPE_STRING,
	260	8*sizeof(gchar),
	261	(unsigned char*) d,
	262	size );
	263
	264	free(d);
	265	}
	266
	267	//-----------------------------------------------------------------------------
	268	// wxClipboard
	269	//-----------------------------------------------------------------------------
	270
	271	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	272
	273	wxClipboard::wxClipboard()
	274	{
	275	m_open = FALSE;
	276
	277	m_ownsClipboard = FALSE;
	278	m_ownsPrimarySelection = FALSE;
	279
	280	m_data = (wxDataObject*) NULL;
	281	m_receivedData = (wxDataObject*) NULL;
	282
	283	/* we use m_targetsWidget to query what formats are available */
	284
	285	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	286	gtk_widget_realize( m_targetsWidget );
	287
	288	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	289	"selection_received",
	290	GTK_SIGNAL_FUNC( targets_selection_received ),
	291	(gpointer) this );
	292
	293	/* we use m_clipboardWidget to get and to offer data */
	294
	295	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	296	gtk_widget_realize( m_clipboardWidget );
	297
	298	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	299	"selection_received",
	300	GTK_SIGNAL_FUNC( selection_received ),
	301	(gpointer) this );
	302
	303	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	304	"selection_clear_event",
	305	GTK_SIGNAL_FUNC( selection_clear_clip ),
	306	(gpointer) NULL );
	307
	308	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	309	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	310
	311	m_formatSupported = FALSE;
	312	m_targetRequested = 0;
	313
	314	m_usePrimary = FALSE;
	315	}
	316
	317	wxClipboard::~wxClipboard()
	318	{
	319	Clear();
	320
	321	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	322	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	323	}
	324
	325	void wxClipboard::Clear()
	326	{
	327	if (m_data)
	328	{
	329	#if wxUSE_THREADS
	330	/* disable GUI threads */
	331	#endif
	332
	333	// As we have data we also own the clipboard. Once we no longer own
	334	// it, clear_selection is called which will set m_data to zero
	335	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	336	{
	337	m_waiting = TRUE;
	338
	339	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	340	(guint32) GDK_CURRENT_TIME );
	341
	342	while (m_waiting) gtk_main_iteration();
	343	}
	344
	345	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	346	{
	347	m_waiting = TRUE;
	348
	349	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	350	(guint32) GDK_CURRENT_TIME );
	351
	352	while (m_waiting) gtk_main_iteration();
	353	}
	354
	355	if (m_data)
	356	{
	357	delete m_data;
	358	m_data = (wxDataObject*) NULL;
	359	}
	360
	361	#if wxUSE_THREADS
	362	/* re-enable GUI threads */
	363	#endif
	364	}
	365
	366	m_targetRequested = 0;
	367	m_formatSupported = FALSE;
	368	}
	369
	370	bool wxClipboard::Open()
	371	{
	372	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	373
	374	m_open = TRUE;
	375
	376	return TRUE;
	377	}
	378
	379	bool wxClipboard::SetData( wxDataObject *data )
	380	{
	381	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	382
	383	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	384
	385	Clear();
	386
	387	return AddData( data );
	388	}
	389
	390	bool wxClipboard::AddData( 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	// we can only store one wxDataObject
	397	Clear();
	398
	399	m_data = data;
	400
	401	// get formats from wxDataObjects
	402	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	403	m_data->GetAllFormats( array );
	404
	405	// primary selection or clipboard
	406	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	407	: g_clipboardAtom;
	408
	409
	410	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	411	{
	412	wxLogTrace( TRACE_CLIPBOARD,
	413	wxT("wxClipboard now supports atom %s"),
	414	array[i].GetId().c_str() );
	415
	416	// printf( "added %s\n",
	417	// gdk_atom_name( array[i].GetFormatId() ) );
	418
	419	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	420	clipboard,
	421	array[i],
	422	0 ); /* what is info ? */
	423	}
	424
	425	delete[] array;
	426
	427	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	428	"selection_get",
	429	GTK_SIGNAL_FUNC(selection_handler),
	430	(gpointer) NULL );
	431
	432	#if wxUSE_THREADS
	433	/* disable GUI threads */
	434	#endif
	435
	436	/* Tell the world we offer clipboard data */
	437	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	438	clipboard,
	439	(guint32) GDK_CURRENT_TIME ));
	440
	441	if (m_usePrimary)
	442	m_ownsPrimarySelection = res;
	443	else
	444	m_ownsClipboard = res;
	445
	446	#if wxUSE_THREADS
	447	/* re-enable GUI threads */
	448	#endif
	449
	450	return res;
	451	}
	452
	453	void wxClipboard::Close()
	454	{
	455	wxCHECK_RET( m_open, wxT("clipboard not open") );
	456
	457	m_open = FALSE;
	458	}
	459
	460	bool wxClipboard::IsOpened() const
	461	{
	462	return m_open;
	463	}
	464
	465	bool wxClipboard::IsSupported( const wxDataFormat& format )
	466	{
	467	/* reentrance problems */
	468	if (m_waiting) return FALSE;
	469
	470	/* store requested format to be asked for by callbacks */
	471	m_targetRequested = format;
	472
	473	#if 0
	474	wxLogTrace( TRACE_CLIPBOARD,
	475	wxT("wxClipboard:IsSupported: requested format: %s"),
	476	format.GetId().c_str() );
	477	#endif
	478
	479	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	480
	481	m_formatSupported = FALSE;
	482
	483	/* perform query. this will set m_formatSupported to
	484	TRUE if m_targetRequested is supported.
	485	also, we have to wait for the "answer" from the
	486	clipboard owner which is an asynchronous process.
	487	therefore we set m_waiting = TRUE here and wait
	488	until the callback "targets_selection_received"
	489	sets it to FALSE */
	490
	491	m_waiting = TRUE;
	492
	493	gtk_selection_convert( m_targetsWidget,
	494	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	495	: g_clipboardAtom,
	496	g_targetsAtom,
	497	(guint32) GDK_CURRENT_TIME );
	498
	499	while (m_waiting) gtk_main_iteration();
	500
	501	if (!m_formatSupported) return FALSE;
	502
	503	return TRUE;
	504	}
	505
	506	bool wxClipboard::GetData( wxDataObject& data )
	507	{
	508	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	509
	510	/* get formats from wxDataObjects */
	511	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	512	data.GetAllFormats( array );
	513
	514	for (size_t i = 0; i < data.GetFormatCount(); i++)
	515	{
	516	wxDataFormat format( array[i] );
	517
	518	wxLogTrace( TRACE_CLIPBOARD,
	519	wxT("wxClipboard::GetData: requested format: %s"),
	520	format.GetId().c_str() );
	521
	522	/* is data supported by clipboard ? */
	523
	524	/* store requested format to be asked for by callbacks */
	525	m_targetRequested = format;
	526
	527	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	528
	529	m_formatSupported = FALSE;
	530
	531	/* perform query. this will set m_formatSupported to
	532	TRUE if m_targetRequested is supported.
	533	also, we have to wait for the "answer" from the
	534	clipboard owner which is an asynchronous process.
	535	therefore we set m_waiting = TRUE here and wait
	536	until the callback "targets_selection_received"
	537	sets it to FALSE */
	538
	539	m_waiting = TRUE;
	540
	541	gtk_selection_convert( m_targetsWidget,
	542	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	543	: g_clipboardAtom,
	544	g_targetsAtom,
	545	(guint32) GDK_CURRENT_TIME );
	546
	547	while (m_waiting) gtk_main_iteration();
	548
	549	if (!m_formatSupported) continue;
	550
	551	/* store pointer to data object to be filled up by callbacks */
	552	m_receivedData = &data;
	553
	554	/* store requested format to be asked for by callbacks */
	555	m_targetRequested = format;
	556
	557	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	558
	559	/* start query */
	560	m_formatSupported = FALSE;
	561
	562	/* ask for clipboard contents. this will set
	563	m_formatSupported to TRUE if m_targetRequested
	564	is supported.
	565	also, we have to wait for the "answer" from the
	566	clipboard owner which is an asynchronous process.
	567	therefore we set m_waiting = TRUE here and wait
	568	until the callback "targets_selection_received"
	569	sets it to FALSE */
	570
	571	m_waiting = TRUE;
	572
	573	wxLogTrace( TRACE_CLIPBOARD,
	574	wxT("wxClipboard::GetData: format found, start convert") );
	575
	576	gtk_selection_convert( m_clipboardWidget,
	577	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	578	: g_clipboardAtom,
	579	m_targetRequested,
	580	(guint32) GDK_CURRENT_TIME );
	581
	582	while (m_waiting) gtk_main_iteration();
	583
	584	/* this is a true error as we checked for the presence of such data before */
	585	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	586
	587	/* return success */
	588	delete[] array;
	589	return TRUE;
	590	}
	591
	592	wxLogTrace( TRACE_CLIPBOARD,
	593	wxT("wxClipboard::GetData: format not found") );
	594
	595	/* return failure */
	596	delete[] array;
	597	return FALSE;
	598	}
	599
	600	#endif
	601	// wxUSE_CLIPBOARD
	602