src/gtk/clipbrd.cpp

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

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

#if wxUSE_CLIPBOARD

#include "wx/clipbrd.h"

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/utils.h"
    #include "wx/dataobj.h"
#endif

#include "wx/gtk/private.h"

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

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;
GdkAtom  g_timestampAtom   = 0;

#if wxUSE_UNICODE
extern GdkAtom g_altTextAtom;
#endif

// 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
//-----------------------------------------------------------------------------

extern "C" {
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(wxGtkString(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
//-----------------------------------------------------------------------------

extern "C" {
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;
    }

#if 0
    This seems to cause problems somehow
    // 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;
    }
#endif

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

    wxTheClipboard->m_formatSupported = true;
    clipboard->m_waiting = false;
}
}

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

extern "C" {
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
//-----------------------------------------------------------------------------

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

    if (!wxTheClipboard->m_data) return;

    wxDataObject *data = wxTheClipboard->m_data;

    // ICCCM says that TIMESTAMP is a required atom.
    // In particular, it satisfies Klipper, which polls
    // TIMESTAMP to see if the clipboards content has changed.
    // It shall return the time which was used to set the data.
    if (selection_data->target == g_timestampAtom)
    {
        guint timestamp = GPOINTER_TO_UINT (signal_data);
        gtk_selection_data_set(selection_data,
                               GDK_SELECTION_TYPE_INTEGER,
                               32,
                               (guchar*)&(timestamp),
                               sizeof(timestamp));
        wxLogTrace(TRACE_CLIPBOARD,
                   _T("Clipboard TIMESTAMP requested, returning timestamp=%u"),
                   timestamp);
        return;
    }

    wxDataFormat format( selection_data->target );

#ifdef __WXDEBUG__
    wxLogTrace(TRACE_CLIPBOARD,
               _T("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s timestamp=%u"),
               format.GetId().c_str(),
               wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->target))).c_str(),
               wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->type))).c_str(),
               wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->selection))).c_str(),
               GPOINTER_TO_UINT( signal_data )
               );
#endif

    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 );

    // NB: GTK+ requires special treatment of UTF8_STRING data, the text
    //     would show as UTF-8 data interpreted as latin1 (?) in other
    //     GTK+ apps if we used gtk_selection_data_set()
    if (format == wxDataFormat(wxDF_UNICODETEXT))
    {
        gtk_selection_data_set_text(
            selection_data,
            (const gchar*)d,
            size );
    }
    else
    {
        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 );

    g_signal_connect (m_targetsWidget, "selection_received",
                      G_CALLBACK (targets_selection_received), this);

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

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

    g_signal_connect (m_clipboardWidget, "selection_received",
                      G_CALLBACK (selection_received), this);

    g_signal_connect (m_clipboardWidget, "selection_clear_event",
                      G_CALLBACK (selection_clear_clip), NULL);

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

    // by default provide TIMESTAMP as a target
    gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                              clipboard,
                              g_timestampAtom,
                              0 );

    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;

    g_signal_connect (m_clipboardWidget, "selection_get",
                      G_CALLBACK (selection_handler),
                      GUINT_TO_POINTER (gtk_get_current_event_time()) );

#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;

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

    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 wxUSE_UNICODE
    if (!m_formatSupported && format == wxDataFormat(wxDF_UNICODETEXT))
    {
        // Another try with plain STRING format
        extern GdkAtom g_altTextAtom;
        return IsSupported(g_altTextAtom);
    }
#endif

    return m_formatSupported;
}

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: src/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	// For compilers that support precompilation, includes "wx.h".
	11	#include "wx/wxprec.h"
	12
	13	#if wxUSE_CLIPBOARD
	14
	15	#include "wx/clipbrd.h"
	16
	17	#ifndef WX_PRECOMP
	18	#include "wx/log.h"
	19	#include "wx/utils.h"
	20	#include "wx/dataobj.h"
	21	#endif
	22
	23	#include "wx/gtk/private.h"
	24
	25	//-----------------------------------------------------------------------------
	26	// data
	27	//-----------------------------------------------------------------------------
	28
	29	GdkAtom g_clipboardAtom = 0;
	30	GdkAtom g_targetsAtom = 0;
	31	GdkAtom g_timestampAtom = 0;
	32
	33	#if wxUSE_UNICODE
	34	extern GdkAtom g_altTextAtom;
	35	#endif
	36
	37	// the trace mask we use with wxLogTrace() - call
	38	// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
	39	// (there will be a lot of them!)
	40	static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
	41
	42	//-----------------------------------------------------------------------------
	43	// reminder
	44	//-----------------------------------------------------------------------------
	45
	46	/* The contents of a selection are returned in a GtkSelectionData
	47	structure. selection/target identify the request.
	48	type specifies the type of the return; if length < 0, and
	49	the data should be ignored. This structure has object semantics -
	50	no fields should be modified directly, they should not be created
	51	directly, and pointers to them should not be stored beyond the duration of
	52	a callback. (If the last is changed, we'll need to add reference
	53	counting)
	54
	55	struct _GtkSelectionData
	56	{
	57	GdkAtom selection;
	58	GdkAtom target;
	59	GdkAtom type;
	60	gint format;
	61	guchar *data;
	62	gint length;
	63	};
	64
	65	*/
	66
	67	//-----------------------------------------------------------------------------
	68	// "selection_received" for targets
	69	//-----------------------------------------------------------------------------
	70
	71	extern "C" {
	72	static void
	73	targets_selection_received( GtkWidget *WXUNUSED(widget),
	74	GtkSelectionData *selection_data,
	75	guint32 WXUNUSED(time),
	76	wxClipboard *clipboard )
	77	{
	78	if ( wxTheClipboard && selection_data->length > 0 )
	79	{
	80	// make sure we got the data in the correct form
	81	GdkAtom type = selection_data->type;
	82	if ( type != GDK_SELECTION_TYPE_ATOM )
	83	{
	84	if ( strcmp(wxGtkString(gdk_atom_name(type)), "TARGETS") )
	85	{
	86	wxLogTrace( TRACE_CLIPBOARD,
	87	_T("got unsupported clipboard target") );
	88
	89	clipboard->m_waiting = false;
	90	return;
	91	}
	92	}
	93
	94	#ifdef __WXDEBUG__
	95	wxDataFormat clip( selection_data->selection );
	96	wxLogTrace( TRACE_CLIPBOARD,
	97	wxT("selection received for targets, clipboard %s"),
	98	clip.GetId().c_str() );
	99	#endif // __WXDEBUG__
	100
	101	// the atoms we received, holding a list of targets (= formats)
	102	GdkAtom atoms = (GdkAtom )selection_data->data;
	103
	104	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	105	{
	106	wxDataFormat format( atoms[i] );
	107
	108	wxLogTrace( TRACE_CLIPBOARD,
	109	wxT("selection received for targets, format %s"),
	110	format.GetId().c_str() );
	111
	112	// printf( "format %s requested %s\n",
	113	// gdk_atom_name( atoms[i] ),
	114	// gdk_atom_name( clipboard->m_targetRequested ) );
	115
	116	if (format == clipboard->m_targetRequested)
	117	{
	118	clipboard->m_waiting = false;
	119	clipboard->m_formatSupported = true;
	120	return;
	121	}
	122	}
	123	}
	124
	125	clipboard->m_waiting = false;
	126	}
	127	}
	128
	129	//-----------------------------------------------------------------------------
	130	// "selection_received" for the actual data
	131	//-----------------------------------------------------------------------------
	132
	133	extern "C" {
	134	static void
	135	selection_received( GtkWidget *WXUNUSED(widget),
	136	GtkSelectionData *selection_data,
	137	guint32 WXUNUSED(time),
	138	wxClipboard *clipboard )
	139	{
	140	if (!wxTheClipboard)
	141	{
	142	clipboard->m_waiting = false;
	143	return;
	144	}
	145
	146	wxDataObject *data_object = clipboard->m_receivedData;
	147
	148	if (!data_object)
	149	{
	150	clipboard->m_waiting = false;
	151	return;
	152	}
	153
	154	if (selection_data->length <= 0)
	155	{
	156	clipboard->m_waiting = false;
	157	return;
	158	}
	159
	160	wxDataFormat format( selection_data->target );
	161
	162	// make sure we got the data in the correct format
	163	if (!data_object->IsSupportedFormat( format ) )
	164	{
	165	clipboard->m_waiting = false;
	166	return;
	167	}
	168
	169	#if 0
	170	This seems to cause problems somehow
	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	#endif
	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	//-----------------------------------------------------------------------------
	188	// "selection_clear"
	189	//-----------------------------------------------------------------------------
	190
	191	extern "C" {
	192	static gint
	193	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	194	{
	195	if (!wxTheClipboard) return true;
	196
	197	if (event->selection == GDK_SELECTION_PRIMARY)
	198	{
	199	wxTheClipboard->m_ownsPrimarySelection = false;
	200	}
	201	else
	202	if (event->selection == g_clipboardAtom)
	203	{
	204	wxTheClipboard->m_ownsClipboard = false;
	205	}
	206	else
	207	{
	208	wxTheClipboard->m_waiting = false;
	209	return FALSE;
	210	}
	211
	212	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	213	(!wxTheClipboard->m_ownsClipboard))
	214	{
	215	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	216	if (wxTheClipboard->m_data)
	217	{
	218	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	219
	220	delete wxTheClipboard->m_data;
	221	wxTheClipboard->m_data = (wxDataObject*) NULL;
	222	}
	223	}
	224
	225	wxTheClipboard->m_waiting = false;
	226	return TRUE;
	227	}
	228	}
	229
	230	//-----------------------------------------------------------------------------
	231	// selection handler for supplying data
	232	//-----------------------------------------------------------------------------
	233
	234	extern "C" {
	235	static void
	236	selection_handler( GtkWidget *WXUNUSED(widget),
	237	GtkSelectionData *selection_data,
	238	guint WXUNUSED(info),
	239	guint WXUNUSED(time),
	240	gpointer signal_data )
	241	{
	242	if (!wxTheClipboard) return;
	243
	244	if (!wxTheClipboard->m_data) return;
	245
	246	wxDataObject *data = wxTheClipboard->m_data;
	247
	248	// ICCCM says that TIMESTAMP is a required atom.
	249	// In particular, it satisfies Klipper, which polls
	250	// TIMESTAMP to see if the clipboards content has changed.
	251	// It shall return the time which was used to set the data.
	252	if (selection_data->target == g_timestampAtom)
	253	{
	254	guint timestamp = GPOINTER_TO_UINT (signal_data);
	255	gtk_selection_data_set(selection_data,
	256	GDK_SELECTION_TYPE_INTEGER,
	257	32,
	258	(guchar*)&(timestamp),
	259	sizeof(timestamp));
	260	wxLogTrace(TRACE_CLIPBOARD,
	261	_T("Clipboard TIMESTAMP requested, returning timestamp=%u"),
	262	timestamp);
	263	return;
	264	}
	265
	266	wxDataFormat format( selection_data->target );
	267
	268	#ifdef __WXDEBUG__
	269	wxLogTrace(TRACE_CLIPBOARD,
	270	_T("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s timestamp=%u"),
	271	format.GetId().c_str(),
	272	wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->target))).c_str(),
	273	wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->type))).c_str(),
	274	wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->selection))).c_str(),
	275	GPOINTER_TO_UINT( signal_data )
	276	);
	277	#endif
	278
	279	if (!data->IsSupportedFormat( format )) return;
	280
	281	int size = data->GetDataSize( format );
	282
	283	if (size == 0) return;
	284
	285	void *d = malloc(size);
	286
	287	// Text data will be in UTF8 in Unicode mode.
	288	data->GetDataHere( selection_data->target, d );
	289
	290	// NB: GTK+ requires special treatment of UTF8_STRING data, the text
	291	// would show as UTF-8 data interpreted as latin1 (?) in other
	292	// GTK+ apps if we used gtk_selection_data_set()
	293	if (format == wxDataFormat(wxDF_UNICODETEXT))
	294	{
	295	gtk_selection_data_set_text(
	296	selection_data,
	297	(const gchar*)d,
	298	size );
	299	}
	300	else
	301	{
	302	gtk_selection_data_set(
	303	selection_data,
	304	GDK_SELECTION_TYPE_STRING,
	305	8*sizeof(gchar),
	306	(unsigned char*) d,
	307	size );
	308	}
	309
	310	free(d);
	311	}
	312	}
	313
	314	//-----------------------------------------------------------------------------
	315	// wxClipboard
	316	//-----------------------------------------------------------------------------
	317
	318	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	319
	320	wxClipboard::wxClipboard()
	321	{
	322	m_open = false;
	323	m_waiting = false;
	324
	325	m_ownsClipboard = false;
	326	m_ownsPrimarySelection = false;
	327
	328	m_data = (wxDataObject*) NULL;
	329	m_receivedData = (wxDataObject*) NULL;
	330
	331	/* we use m_targetsWidget to query what formats are available */
	332
	333	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	334	gtk_widget_realize( m_targetsWidget );
	335
	336	g_signal_connect (m_targetsWidget, "selection_received",
	337	G_CALLBACK (targets_selection_received), this);
	338
	339	/* we use m_clipboardWidget to get and to offer data */
	340
	341	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	342	gtk_widget_realize( m_clipboardWidget );
	343
	344	g_signal_connect (m_clipboardWidget, "selection_received",
	345	G_CALLBACK (selection_received), this);
	346
	347	g_signal_connect (m_clipboardWidget, "selection_clear_event",
	348	G_CALLBACK (selection_clear_clip), NULL);
	349
	350	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	351	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	352	if (!g_timestampAtom) g_timestampAtom = gdk_atom_intern ("TIMESTAMP", FALSE);
	353
	354	m_formatSupported = false;
	355	m_targetRequested = 0;
	356
	357	m_usePrimary = false;
	358	}
	359
	360	wxClipboard::~wxClipboard()
	361	{
	362	Clear();
	363
	364	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	365	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	366	}
	367
	368	void wxClipboard::Clear()
	369	{
	370	if (m_data)
	371	{
	372	#if wxUSE_THREADS
	373	/* disable GUI threads */
	374	#endif
	375
	376	// As we have data we also own the clipboard. Once we no longer own
	377	// it, clear_selection is called which will set m_data to zero
	378	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	379	{
	380	m_waiting = true;
	381
	382	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	383	(guint32) GDK_CURRENT_TIME );
	384
	385	while (m_waiting) gtk_main_iteration();
	386	}
	387
	388	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	389	{
	390	m_waiting = true;
	391
	392	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	393	(guint32) GDK_CURRENT_TIME );
	394
	395	while (m_waiting) gtk_main_iteration();
	396	}
	397
	398	if (m_data)
	399	{
	400	delete m_data;
	401	m_data = (wxDataObject*) NULL;
	402	}
	403
	404	#if wxUSE_THREADS
	405	/* re-enable GUI threads */
	406	#endif
	407	}
	408
	409	m_targetRequested = 0;
	410	m_formatSupported = false;
	411	}
	412
	413	bool wxClipboard::Open()
	414	{
	415	wxCHECK_MSG( !m_open, false, wxT("clipboard already open") );
	416
	417	m_open = true;
	418
	419	return true;
	420	}
	421
	422	bool wxClipboard::SetData( wxDataObject *data )
	423	{
	424	wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
	425
	426	wxCHECK_MSG( data, false, wxT("data is invalid") );
	427
	428	Clear();
	429
	430	return AddData( data );
	431	}
	432
	433	bool wxClipboard::AddData( wxDataObject *data )
	434	{
	435	wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
	436
	437	wxCHECK_MSG( data, false, wxT("data is invalid") );
	438
	439	// we can only store one wxDataObject
	440	Clear();
	441
	442	m_data = data;
	443
	444	// get formats from wxDataObjects
	445	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	446	m_data->GetAllFormats( array );
	447
	448	// primary selection or clipboard
	449	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	450	: g_clipboardAtom;
	451
	452	// by default provide TIMESTAMP as a target
	453	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	454	clipboard,
	455	g_timestampAtom,
	456	0 );
	457
	458	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	459	{
	460	wxLogTrace( TRACE_CLIPBOARD,
	461	wxT("wxClipboard now supports atom %s"),
	462	array[i].GetId().c_str() );
	463
	464	// printf( "added %s\n",
	465	// gdk_atom_name( array[i].GetFormatId() ) );
	466
	467	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	468	clipboard,
	469	array[i],
	470	0 ); /* what is info ? */
	471	}
	472
	473	delete[] array;
	474
	475	g_signal_connect (m_clipboardWidget, "selection_get",
	476	G_CALLBACK (selection_handler),
	477	GUINT_TO_POINTER (gtk_get_current_event_time()) );
	478
	479	#if wxUSE_THREADS
	480	/* disable GUI threads */
	481	#endif
	482
	483	/* Tell the world we offer clipboard data */
	484	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	485	clipboard,
	486	(guint32) GDK_CURRENT_TIME ));
	487
	488	if (m_usePrimary)
	489	m_ownsPrimarySelection = res;
	490	else
	491	m_ownsClipboard = res;
	492
	493	#if wxUSE_THREADS
	494	/* re-enable GUI threads */
	495	#endif
	496
	497	return res;
	498	}
	499
	500	void wxClipboard::Close()
	501	{
	502	wxCHECK_RET( m_open, wxT("clipboard not open") );
	503
	504	m_open = false;
	505	}
	506
	507	bool wxClipboard::IsOpened() const
	508	{
	509	return m_open;
	510	}
	511
	512	bool wxClipboard::IsSupported( const wxDataFormat& format )
	513	{
	514	/* reentrance problems */
	515	if (m_waiting) return false;
	516
	517	/* store requested format to be asked for by callbacks */
	518	m_targetRequested = format;
	519
	520	wxLogTrace( TRACE_CLIPBOARD,
	521	wxT("wxClipboard:IsSupported: requested format: %s"),
	522	format.GetId().c_str() );
	523
	524	wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
	525
	526	m_formatSupported = false;
	527
	528	/* perform query. this will set m_formatSupported to
	529	true if m_targetRequested is supported.
	530	also, we have to wait for the "answer" from the
	531	clipboard owner which is an asynchronous process.
	532	therefore we set m_waiting = true here and wait
	533	until the callback "targets_selection_received"
	534	sets it to false */
	535
	536	m_waiting = true;
	537
	538	gtk_selection_convert( m_targetsWidget,
	539	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	540	: g_clipboardAtom,
	541	g_targetsAtom,
	542	(guint32) GDK_CURRENT_TIME );
	543
	544	while (m_waiting) gtk_main_iteration();
	545
	546	#if wxUSE_UNICODE
	547	if (!m_formatSupported && format == wxDataFormat(wxDF_UNICODETEXT))
	548	{
	549	// Another try with plain STRING format
	550	extern GdkAtom g_altTextAtom;
	551	return IsSupported(g_altTextAtom);
	552	}
	553	#endif
	554
	555	return m_formatSupported;
	556	}
	557
	558	bool wxClipboard::GetData( wxDataObject& data )
	559	{
	560	wxCHECK_MSG( m_open, false, wxT("clipboard not open") );
	561
	562	/* get formats from wxDataObjects */
	563	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	564	data.GetAllFormats( array );
	565
	566	for (size_t i = 0; i < data.GetFormatCount(); i++)
	567	{
	568	wxDataFormat format( array[i] );
	569
	570	wxLogTrace( TRACE_CLIPBOARD,
	571	wxT("wxClipboard::GetData: requested format: %s"),
	572	format.GetId().c_str() );
	573
	574	/* is data supported by clipboard ? */
	575
	576	/* store requested format to be asked for by callbacks */
	577	m_targetRequested = format;
	578
	579	wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
	580
	581	m_formatSupported = false;
	582
	583	/* perform query. this will set m_formatSupported to
	584	true if m_targetRequested 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	gtk_selection_convert( m_targetsWidget,
	594	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	595	: g_clipboardAtom,
	596	g_targetsAtom,
	597	(guint32) GDK_CURRENT_TIME );
	598
	599	while (m_waiting) gtk_main_iteration();
	600
	601	if (!m_formatSupported) continue;
	602
	603	/* store pointer to data object to be filled up by callbacks */
	604	m_receivedData = &data;
	605
	606	/* store requested format to be asked for by callbacks */
	607	m_targetRequested = format;
	608
	609	wxCHECK_MSG( m_targetRequested, false, wxT("invalid clipboard format") );
	610
	611	/* start query */
	612	m_formatSupported = false;
	613
	614	/* ask for clipboard contents. this will set
	615	m_formatSupported to true if m_targetRequested
	616	is supported.
	617	also, we have to wait for the "answer" from the
	618	clipboard owner which is an asynchronous process.
	619	therefore we set m_waiting = true here and wait
	620	until the callback "targets_selection_received"
	621	sets it to false */
	622
	623	m_waiting = true;
	624
	625	wxLogTrace( TRACE_CLIPBOARD,
	626	wxT("wxClipboard::GetData: format found, start convert") );
	627
	628	gtk_selection_convert( m_clipboardWidget,
	629	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	630	: g_clipboardAtom,
	631	m_targetRequested,
	632	(guint32) GDK_CURRENT_TIME );
	633
	634	while (m_waiting) gtk_main_iteration();
	635
	636	/* this is a true error as we checked for the presence of such data before */
	637	wxCHECK_MSG( m_formatSupported, false, wxT("error retrieving data from clipboard") );
	638
	639	/* return success */
	640	delete[] array;
	641	return true;
	642	}
	643
	644	wxLogTrace( TRACE_CLIPBOARD,
	645	wxT("wxClipboard::GetData: format not found") );
	646
	647	/* return failure */
	648	delete[] array;
	649	return false;
	650	}
	651
	652	#endif
	653	// wxUSE_CLIPBOARD