src/gtk1/clipbrd.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        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"

#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;

#if defined(__WXGTK20__) && 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(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 WXUNUSED(data) )
{
    if (!wxTheClipboard) return;

    if (!wxTheClipboard->m_data) return;

    wxDataObject *data = wxTheClipboard->m_data;

    wxDataFormat format( selection_data->target );

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

#ifdef __WXGTK20__
    // 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-1 );
    }
    else
#endif
    {
        gtk_selection_data_set(
            selection_data,
            GDK_SELECTION_TYPE_STRING,
            8*sizeof(gchar),
            (unsigned char*) d,
            size-1 );
    }

    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;

    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 defined(__WXGTK20__) && 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: 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	#include "wx/clipbrd.h"
	14
	15	#if wxUSE_CLIPBOARD
	16
	17	#include "wx/dataobj.h"
	18	#include "wx/utils.h"
	19	#include "wx/log.h"
	20
	21	#include <glib.h>
	22	#include <gdk/gdk.h>
	23	#include <gtk/gtk.h>
	24
	25	//-----------------------------------------------------------------------------
	26	// thread system
	27	//-----------------------------------------------------------------------------
	28
	29	#if wxUSE_THREADS
	30	#endif
	31
	32	//-----------------------------------------------------------------------------
	33	// data
	34	//-----------------------------------------------------------------------------
	35
	36	GdkAtom g_clipboardAtom = 0;
	37	GdkAtom g_targetsAtom = 0;
	38
	39	#if defined(__WXGTK20__) && wxUSE_UNICODE
	40	extern GdkAtom g_altTextAtom;
	41	#endif
	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	extern "C" {
	78	static void
	79	targets_selection_received( GtkWidget *WXUNUSED(widget),
	80	GtkSelectionData *selection_data,
	81	guint32 WXUNUSED(time),
	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	// printf( "format %s requested %s\n",
	119	// gdk_atom_name( atoms[i] ),
	120	// gdk_atom_name( clipboard->m_targetRequested ) );
	121
	122	if (format == clipboard->m_targetRequested)
	123	{
	124	clipboard->m_waiting = FALSE;
	125	clipboard->m_formatSupported = TRUE;
	126	return;
	127	}
	128	}
	129	}
	130
	131	clipboard->m_waiting = FALSE;
	132	}
	133	}
	134
	135	//-----------------------------------------------------------------------------
	136	// "selection_received" for the actual data
	137	//-----------------------------------------------------------------------------
	138
	139	extern "C" {
	140	static void
	141	selection_received( GtkWidget *WXUNUSED(widget),
	142	GtkSelectionData *selection_data,
	143	guint32 WXUNUSED(time),
	144	wxClipboard *clipboard )
	145	{
	146	if (!wxTheClipboard)
	147	{
	148	clipboard->m_waiting = FALSE;
	149	return;
	150	}
	151
	152	wxDataObject *data_object = clipboard->m_receivedData;
	153
	154	if (!data_object)
	155	{
	156	clipboard->m_waiting = FALSE;
	157	return;
	158	}
	159
	160	if (selection_data->length <= 0)
	161	{
	162	clipboard->m_waiting = FALSE;
	163	return;
	164	}
	165
	166	wxDataFormat format( selection_data->target );
	167
	168	// make sure we got the data in the correct format
	169	if (!data_object->IsSupportedFormat( format ) )
	170	{
	171	clipboard->m_waiting = FALSE;
	172	return;
	173	}
	174
	175	#if 0
	176	This seems to cause problems somehow
	177	// make sure we got the data in the correct form (selection type).
	178	// if so, copy data to target object
	179	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	180	{
	181	clipboard->m_waiting = FALSE;
	182	return;
	183	}
	184	#endif
	185
	186	data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
	187
	188	wxTheClipboard->m_formatSupported = TRUE;
	189	clipboard->m_waiting = FALSE;
	190	}
	191	}
	192
	193	//-----------------------------------------------------------------------------
	194	// "selection_clear"
	195	//-----------------------------------------------------------------------------
	196
	197	extern "C" {
	198	static gint
	199	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	200	{
	201	if (!wxTheClipboard) return TRUE;
	202
	203	if (event->selection == GDK_SELECTION_PRIMARY)
	204	{
	205	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	206	}
	207	else
	208	if (event->selection == g_clipboardAtom)
	209	{
	210	wxTheClipboard->m_ownsClipboard = FALSE;
	211	}
	212	else
	213	{
	214	wxTheClipboard->m_waiting = FALSE;
	215	return FALSE;
	216	}
	217
	218	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	219	(!wxTheClipboard->m_ownsClipboard))
	220	{
	221	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	222	if (wxTheClipboard->m_data)
	223	{
	224	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	225
	226	delete wxTheClipboard->m_data;
	227	wxTheClipboard->m_data = (wxDataObject*) NULL;
	228	}
	229	}
	230
	231	wxTheClipboard->m_waiting = FALSE;
	232	return TRUE;
	233	}
	234	}
	235
	236	//-----------------------------------------------------------------------------
	237	// selection handler for supplying data
	238	//-----------------------------------------------------------------------------
	239
	240	extern "C" {
	241	static void
	242	selection_handler( GtkWidget *WXUNUSED(widget),
	243	GtkSelectionData *selection_data,
	244	guint WXUNUSED(info),
	245	guint WXUNUSED(time),
	246	gpointer WXUNUSED(data) )
	247	{
	248	if (!wxTheClipboard) return;
	249
	250	if (!wxTheClipboard->m_data) return;
	251
	252	wxDataObject *data = wxTheClipboard->m_data;
	253
	254	wxDataFormat format( selection_data->target );
	255
	256	#ifdef __WXDEBUG__
	257	wxLogTrace(TRACE_CLIPBOARD,
	258	_T("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s"),
	259	format.GetId().c_str(),
	260	wxString::FromAscii(gdk_atom_name(selection_data->target)).c_str(),
	261	wxString::FromAscii(gdk_atom_name(selection_data->type)).c_str(),
	262	wxString::FromAscii(gdk_atom_name(selection_data->selection)).c_str()
	263	);
	264	#endif
	265
	266	if (!data->IsSupportedFormat( format )) return;
	267
	268	int size = data->GetDataSize( format );
	269
	270	if (size == 0) return;
	271
	272	void *d = malloc(size);
	273
	274	// Text data will be in UTF8 in Unicode mode.
	275	data->GetDataHere( selection_data->target, d );
	276
	277	#ifdef __WXGTK20__
	278	// NB: GTK+ requires special treatment of UTF8_STRING data, the text
	279	// would show as UTF-8 data interpreted as latin1 (?) in other
	280	// GTK+ apps if we used gtk_selection_data_set()
	281	if (format == wxDataFormat(wxDF_UNICODETEXT))
	282	{
	283	gtk_selection_data_set_text(
	284	selection_data,
	285	(const gchar*)d,
	286	size-1 );
	287	}
	288	else
	289	#endif
	290	{
	291	gtk_selection_data_set(
	292	selection_data,
	293	GDK_SELECTION_TYPE_STRING,
	294	8*sizeof(gchar),
	295	(unsigned char*) d,
	296	size-1 );
	297	}
	298
	299	free(d);
	300	}
	301	}
	302
	303	//-----------------------------------------------------------------------------
	304	// wxClipboard
	305	//-----------------------------------------------------------------------------
	306
	307	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	308
	309	wxClipboard::wxClipboard()
	310	{
	311	m_open = FALSE;
	312	m_waiting = FALSE;
	313
	314	m_ownsClipboard = FALSE;
	315	m_ownsPrimarySelection = FALSE;
	316
	317	m_data = (wxDataObject*) NULL;
	318	m_receivedData = (wxDataObject*) NULL;
	319
	320	/* we use m_targetsWidget to query what formats are available */
	321
	322	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	323	gtk_widget_realize( m_targetsWidget );
	324
	325	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	326	"selection_received",
	327	GTK_SIGNAL_FUNC( targets_selection_received ),
	328	(gpointer) this );
	329
	330	/* we use m_clipboardWidget to get and to offer data */
	331
	332	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	333	gtk_widget_realize( m_clipboardWidget );
	334
	335	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	336	"selection_received",
	337	GTK_SIGNAL_FUNC( selection_received ),
	338	(gpointer) this );
	339
	340	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	341	"selection_clear_event",
	342	GTK_SIGNAL_FUNC( selection_clear_clip ),
	343	(gpointer) NULL );
	344
	345	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	346	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	347
	348	m_formatSupported = FALSE;
	349	m_targetRequested = 0;
	350
	351	m_usePrimary = FALSE;
	352	}
	353
	354	wxClipboard::~wxClipboard()
	355	{
	356	Clear();
	357
	358	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	359	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	360	}
	361
	362	void wxClipboard::Clear()
	363	{
	364	if (m_data)
	365	{
	366	#if wxUSE_THREADS
	367	/* disable GUI threads */
	368	#endif
	369
	370	// As we have data we also own the clipboard. Once we no longer own
	371	// it, clear_selection is called which will set m_data to zero
	372	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	373	{
	374	m_waiting = TRUE;
	375
	376	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	377	(guint32) GDK_CURRENT_TIME );
	378
	379	while (m_waiting) gtk_main_iteration();
	380	}
	381
	382	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	383	{
	384	m_waiting = TRUE;
	385
	386	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	387	(guint32) GDK_CURRENT_TIME );
	388
	389	while (m_waiting) gtk_main_iteration();
	390	}
	391
	392	if (m_data)
	393	{
	394	delete m_data;
	395	m_data = (wxDataObject*) NULL;
	396	}
	397
	398	#if wxUSE_THREADS
	399	/* re-enable GUI threads */
	400	#endif
	401	}
	402
	403	m_targetRequested = 0;
	404	m_formatSupported = FALSE;
	405	}
	406
	407	bool wxClipboard::Open()
	408	{
	409	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	410
	411	m_open = TRUE;
	412
	413	return TRUE;
	414	}
	415
	416	bool wxClipboard::SetData( wxDataObject *data )
	417	{
	418	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	419
	420	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	421
	422	Clear();
	423
	424	return AddData( data );
	425	}
	426
	427	bool wxClipboard::AddData( wxDataObject *data )
	428	{
	429	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	430
	431	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	432
	433	// we can only store one wxDataObject
	434	Clear();
	435
	436	m_data = data;
	437
	438	// get formats from wxDataObjects
	439	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	440	m_data->GetAllFormats( array );
	441
	442	// primary selection or clipboard
	443	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	444	: g_clipboardAtom;
	445
	446
	447	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	448	{
	449	wxLogTrace( TRACE_CLIPBOARD,
	450	wxT("wxClipboard now supports atom %s"),
	451	array[i].GetId().c_str() );
	452
	453	// printf( "added %s\n",
	454	// gdk_atom_name( array[i].GetFormatId() ) );
	455
	456	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	457	clipboard,
	458	array[i],
	459	0 ); /* what is info ? */
	460	}
	461
	462	delete[] array;
	463
	464	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	465	"selection_get",
	466	GTK_SIGNAL_FUNC(selection_handler),
	467	(gpointer) NULL );
	468
	469	#if wxUSE_THREADS
	470	/* disable GUI threads */
	471	#endif
	472
	473	/* Tell the world we offer clipboard data */
	474	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	475	clipboard,
	476	(guint32) GDK_CURRENT_TIME ));
	477
	478	if (m_usePrimary)
	479	m_ownsPrimarySelection = res;
	480	else
	481	m_ownsClipboard = res;
	482
	483	#if wxUSE_THREADS
	484	/* re-enable GUI threads */
	485	#endif
	486
	487	return res;
	488	}
	489
	490	void wxClipboard::Close()
	491	{
	492	wxCHECK_RET( m_open, wxT("clipboard not open") );
	493
	494	m_open = FALSE;
	495	}
	496
	497	bool wxClipboard::IsOpened() const
	498	{
	499	return m_open;
	500	}
	501
	502	bool wxClipboard::IsSupported( const wxDataFormat& format )
	503	{
	504	/* reentrance problems */
	505	if (m_waiting) return FALSE;
	506
	507	/* store requested format to be asked for by callbacks */
	508	m_targetRequested = format;
	509
	510	wxLogTrace( TRACE_CLIPBOARD,
	511	wxT("wxClipboard:IsSupported: requested format: %s"),
	512	format.GetId().c_str() );
	513
	514	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	515
	516	m_formatSupported = FALSE;
	517
	518	/* perform query. this will set m_formatSupported to
	519	TRUE if m_targetRequested is supported.
	520	also, we have to wait for the "answer" from the
	521	clipboard owner which is an asynchronous process.
	522	therefore we set m_waiting = TRUE here and wait
	523	until the callback "targets_selection_received"
	524	sets it to FALSE */
	525
	526	m_waiting = TRUE;
	527
	528	gtk_selection_convert( m_targetsWidget,
	529	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	530	: g_clipboardAtom,
	531	g_targetsAtom,
	532	(guint32) GDK_CURRENT_TIME );
	533
	534	while (m_waiting) gtk_main_iteration();
	535
	536	#if defined(__WXGTK20__) && wxUSE_UNICODE
	537	if (!m_formatSupported && format == wxDataFormat(wxDF_UNICODETEXT))
	538	{
	539	// Another try with plain STRING format
	540	extern GdkAtom g_altTextAtom;
	541	return IsSupported(g_altTextAtom);
	542	}
	543	#endif
	544
	545	return m_formatSupported;
	546	}
	547
	548	bool wxClipboard::GetData( wxDataObject& data )
	549	{
	550	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	551
	552	/* get formats from wxDataObjects */
	553	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	554	data.GetAllFormats( array );
	555
	556	for (size_t i = 0; i < data.GetFormatCount(); i++)
	557	{
	558	wxDataFormat format( array[i] );
	559
	560	wxLogTrace( TRACE_CLIPBOARD,
	561	wxT("wxClipboard::GetData: requested format: %s"),
	562	format.GetId().c_str() );
	563
	564	/* is data supported by clipboard ? */
	565
	566	/* store requested format to be asked for by callbacks */
	567	m_targetRequested = format;
	568
	569	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	570
	571	m_formatSupported = FALSE;
	572
	573	/* perform query. this will set m_formatSupported to
	574	TRUE if m_targetRequested is supported.
	575	also, we have to wait for the "answer" from the
	576	clipboard owner which is an asynchronous process.
	577	therefore we set m_waiting = TRUE here and wait
	578	until the callback "targets_selection_received"
	579	sets it to FALSE */
	580
	581	m_waiting = TRUE;
	582
	583	gtk_selection_convert( m_targetsWidget,
	584	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	585	: g_clipboardAtom,
	586	g_targetsAtom,
	587	(guint32) GDK_CURRENT_TIME );
	588
	589	while (m_waiting) gtk_main_iteration();
	590
	591	if (!m_formatSupported) continue;
	592
	593	/* store pointer to data object to be filled up by callbacks */
	594	m_receivedData = &data;
	595
	596	/* store requested format to be asked for by callbacks */
	597	m_targetRequested = format;
	598
	599	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	600
	601	/* start query */
	602	m_formatSupported = FALSE;
	603
	604	/* ask for clipboard contents. this will set
	605	m_formatSupported to TRUE if m_targetRequested
	606	is supported.
	607	also, we have to wait for the "answer" from the
	608	clipboard owner which is an asynchronous process.
	609	therefore we set m_waiting = TRUE here and wait
	610	until the callback "targets_selection_received"
	611	sets it to FALSE */
	612
	613	m_waiting = TRUE;
	614
	615	wxLogTrace( TRACE_CLIPBOARD,
	616	wxT("wxClipboard::GetData: format found, start convert") );
	617
	618	gtk_selection_convert( m_clipboardWidget,
	619	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	620	: g_clipboardAtom,
	621	m_targetRequested,
	622	(guint32) GDK_CURRENT_TIME );
	623
	624	while (m_waiting) gtk_main_iteration();
	625
	626	/* this is a true error as we checked for the presence of such data before */
	627	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	628
	629	/* return success */
	630	delete[] array;
	631	return TRUE;
	632	}
	633
	634	wxLogTrace( TRACE_CLIPBOARD,
	635	wxT("wxClipboard::GetData: format not found") );
	636
	637	/* return failure */
	638	delete[] array;
	639	return FALSE;
	640	}
	641
	642	#endif
	643	// wxUSE_CLIPBOARD
	644