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_waiting = 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	m_waiting = FALSE;
	277
	278	m_ownsClipboard = FALSE;
	279	m_ownsPrimarySelection = FALSE;
	280
	281	m_data = (wxDataObject*) NULL;
	282	m_receivedData = (wxDataObject*) NULL;
	283
	284	/* we use m_targetsWidget to query what formats are available */
	285
	286	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	287	gtk_widget_realize( m_targetsWidget );
	288
	289	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	290	"selection_received",
	291	GTK_SIGNAL_FUNC( targets_selection_received ),
	292	(gpointer) this );
	293
	294	/* we use m_clipboardWidget to get and to offer data */
	295
	296	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	297	gtk_widget_realize( m_clipboardWidget );
	298
	299	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	300	"selection_received",
	301	GTK_SIGNAL_FUNC( selection_received ),
	302	(gpointer) this );
	303
	304	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	305	"selection_clear_event",
	306	GTK_SIGNAL_FUNC( selection_clear_clip ),
	307	(gpointer) NULL );
	308
	309	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	310	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	311
	312	m_formatSupported = FALSE;
	313	m_targetRequested = 0;
	314
	315	m_usePrimary = FALSE;
	316	}
	317
	318	wxClipboard::~wxClipboard()
	319	{
	320	Clear();
	321
	322	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	323	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	324	}
	325
	326	void wxClipboard::Clear()
	327	{
	328	if (m_data)
	329	{
	330	#if wxUSE_THREADS
	331	/* disable GUI threads */
	332	#endif
	333
	334	// As we have data we also own the clipboard. Once we no longer own
	335	// it, clear_selection is called which will set m_data to zero
	336	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	337	{
	338	m_waiting = TRUE;
	339
	340	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	341	(guint32) GDK_CURRENT_TIME );
	342
	343	while (m_waiting) gtk_main_iteration();
	344	}
	345
	346	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	347	{
	348	m_waiting = TRUE;
	349
	350	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	351	(guint32) GDK_CURRENT_TIME );
	352
	353	while (m_waiting) gtk_main_iteration();
	354	}
	355
	356	if (m_data)
	357	{
	358	delete m_data;
	359	m_data = (wxDataObject*) NULL;
	360	}
	361
	362	#if wxUSE_THREADS
	363	/* re-enable GUI threads */
	364	#endif
	365	}
	366
	367	m_targetRequested = 0;
	368	m_formatSupported = FALSE;
	369	}
	370
	371	bool wxClipboard::Open()
	372	{
	373	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	374
	375	m_open = TRUE;
	376
	377	return TRUE;
	378	}
	379
	380	bool wxClipboard::SetData( wxDataObject *data )
	381	{
	382	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	383
	384	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	385
	386	Clear();
	387
	388	return AddData( data );
	389	}
	390
	391	bool wxClipboard::AddData( wxDataObject *data )
	392	{
	393	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	394
	395	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	396
	397	// we can only store one wxDataObject
	398	Clear();
	399
	400	m_data = data;
	401
	402	// get formats from wxDataObjects
	403	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	404	m_data->GetAllFormats( array );
	405
	406	// primary selection or clipboard
	407	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	408	: g_clipboardAtom;
	409
	410
	411	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	412	{
	413	wxLogTrace( TRACE_CLIPBOARD,
	414	wxT("wxClipboard now supports atom %s"),
	415	array[i].GetId().c_str() );
	416
	417	// printf( "added %s\n",
	418	// gdk_atom_name( array[i].GetFormatId() ) );
	419
	420	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	421	clipboard,
	422	array[i],
	423	0 ); /* what is info ? */
	424	}
	425
	426	delete[] array;
	427
	428	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	429	"selection_get",
	430	GTK_SIGNAL_FUNC(selection_handler),
	431	(gpointer) NULL );
	432
	433	#if wxUSE_THREADS
	434	/* disable GUI threads */
	435	#endif
	436
	437	/* Tell the world we offer clipboard data */
	438	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	439	clipboard,
	440	(guint32) GDK_CURRENT_TIME ));
	441
	442	if (m_usePrimary)
	443	m_ownsPrimarySelection = res;
	444	else
	445	m_ownsClipboard = res;
	446
	447	#if wxUSE_THREADS
	448	/* re-enable GUI threads */
	449	#endif
	450
	451	return res;
	452	}
	453
	454	void wxClipboard::Close()
	455	{
	456	wxCHECK_RET( m_open, wxT("clipboard not open") );
	457
	458	m_open = FALSE;
	459	}
	460
	461	bool wxClipboard::IsOpened() const
	462	{
	463	return m_open;
	464	}
	465
	466	bool wxClipboard::IsSupported( const wxDataFormat& format )
	467	{
	468	/* reentrance problems */
	469	if (m_waiting) return FALSE;
	470
	471	/* store requested format to be asked for by callbacks */
	472	m_targetRequested = format;
	473
	474	#if 0
	475	wxLogTrace( TRACE_CLIPBOARD,
	476	wxT("wxClipboard:IsSupported: requested format: %s"),
	477	format.GetId().c_str() );
	478	#endif
	479
	480	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	481
	482	m_formatSupported = FALSE;
	483
	484	/* perform query. this will set m_formatSupported to
	485	TRUE if m_targetRequested is supported.
	486	also, we have to wait for the "answer" from the
	487	clipboard owner which is an asynchronous process.
	488	therefore we set m_waiting = TRUE here and wait
	489	until the callback "targets_selection_received"
	490	sets it to FALSE */
	491
	492	m_waiting = TRUE;
	493
	494	gtk_selection_convert( m_targetsWidget,
	495	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	496	: g_clipboardAtom,
	497	g_targetsAtom,
	498	(guint32) GDK_CURRENT_TIME );
	499
	500	while (m_waiting) gtk_main_iteration();
	501
	502	if (!m_formatSupported) return FALSE;
	503
	504	return TRUE;
	505	}
	506
	507	bool wxClipboard::GetData( wxDataObject& data )
	508	{
	509	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	510
	511	/* get formats from wxDataObjects */
	512	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	513	data.GetAllFormats( array );
	514
	515	for (size_t i = 0; i < data.GetFormatCount(); i++)
	516	{
	517	wxDataFormat format( array[i] );
	518
	519	wxLogTrace( TRACE_CLIPBOARD,
	520	wxT("wxClipboard::GetData: requested format: %s"),
	521	format.GetId().c_str() );
	522
	523	/* is data supported by clipboard ? */
	524
	525	/* store requested format to be asked for by callbacks */
	526	m_targetRequested = format;
	527
	528	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	529
	530	m_formatSupported = FALSE;
	531
	532	/* perform query. this will set m_formatSupported to
	533	TRUE if m_targetRequested is supported.
	534	also, we have to wait for the "answer" from the
	535	clipboard owner which is an asynchronous process.
	536	therefore we set m_waiting = TRUE here and wait
	537	until the callback "targets_selection_received"
	538	sets it to FALSE */
	539
	540	m_waiting = TRUE;
	541
	542	gtk_selection_convert( m_targetsWidget,
	543	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	544	: g_clipboardAtom,
	545	g_targetsAtom,
	546	(guint32) GDK_CURRENT_TIME );
	547
	548	while (m_waiting) gtk_main_iteration();
	549
	550	if (!m_formatSupported) continue;
	551
	552	/* store pointer to data object to be filled up by callbacks */
	553	m_receivedData = &data;
	554
	555	/* store requested format to be asked for by callbacks */
	556	m_targetRequested = format;
	557
	558	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	559
	560	/* start query */
	561	m_formatSupported = FALSE;
	562
	563	/* ask for clipboard contents. this will set
	564	m_formatSupported to TRUE if m_targetRequested
	565	is supported.
	566	also, we have to wait for the "answer" from the
	567	clipboard owner which is an asynchronous process.
	568	therefore we set m_waiting = TRUE here and wait
	569	until the callback "targets_selection_received"
	570	sets it to FALSE */
	571
	572	m_waiting = TRUE;
	573
	574	wxLogTrace( TRACE_CLIPBOARD,
	575	wxT("wxClipboard::GetData: format found, start convert") );
	576
	577	gtk_selection_convert( m_clipboardWidget,
	578	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	579	: g_clipboardAtom,
	580	m_targetRequested,
	581	(guint32) GDK_CURRENT_TIME );
	582
	583	while (m_waiting) gtk_main_iteration();
	584
	585	/* this is a true error as we checked for the presence of such data before */
	586	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	587
	588	/* return success */
	589	delete[] array;
	590	return TRUE;
	591	}
	592
	593	wxLogTrace( TRACE_CLIPBOARD,
	594	wxT("wxClipboard::GetData: format not found") );
	595
	596	/* return failure */
	597	delete[] array;
	598	return FALSE;
	599	}
	600
	601	#endif
	602	// wxUSE_CLIPBOARD
	603