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
extern void wxapp_install_thread_wakeup();
extern void wxapp_uninstall_thread_wakeup();
#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;

    /* this will fail for composite formats */
    if (format.GetType() == wxDF_TEXT)
    {
        wxTextDataObject *text_object = (wxTextDataObject*) data;
        wxString text( text_object->GetText() );

#if wxUSE_UNICODE
        const wxWX2MBbuf s = text.mbc_str();
        int len = strlen(s);
#else // more efficient in non-Unicode
        const char *s = text.c_str();
        int len = (int) text.Length();
#endif
        gtk_selection_data_set(
            selection_data,
            GDK_SELECTION_TYPE_STRING,
            8*sizeof(gchar),
            (unsigned char*) (const char*) s,
            len );

        return;
    }

    int size = data->GetDataSize( format );

    if (size == 0) return;

    char *d = new char[size];

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

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

//-----------------------------------------------------------------------------
// 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 */
        wxapp_uninstall_thread_wakeup();
#endif

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

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