src/gtk/clipbrd.cpp

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

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

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

#include "wx/clipbrd.h"

#if wxUSE_CLIPBOARD

#include "wx/dataobj.h"
#include "wx/utils.h"
#include "wx/log.h"

#include <glib.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>

//-----------------------------------------------------------------------------
// thread system
//-----------------------------------------------------------------------------

#if wxUSE_THREADS
#endif

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

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;

#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
//-----------------------------------------------------------------------------

static void
targets_selection_received( GtkWidget *WXUNUSED(widget),
                            GtkSelectionData *selection_data,
                            guint32 WXUNUSED(time),
                            wxClipboard *clipboard )
{
    if ( wxTheClipboard && selection_data->length > 0 )
    {
        // make sure we got the data in the correct form
        GdkAtom type = selection_data->type;
        if ( type != GDK_SELECTION_TYPE_ATOM )
        {
            if ( strcmp(gdk_atom_name(type), "TARGETS") )
            {
                wxLogTrace( TRACE_CLIPBOARD,
                            _T("got unsupported clipboard target") );

                clipboard->m_waiting = FALSE;
                return;
            }
        }

#ifdef __WXDEBUG__
        wxDataFormat clip( selection_data->selection );
        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("selection received for targets, clipboard %s"),
                    clip.GetId().c_str() );
#endif // __WXDEBUG__

        // the atoms we received, holding a list of targets (= formats)
        GdkAtom *atoms = (GdkAtom *)selection_data->data;

        for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
        {
            wxDataFormat format( atoms[i] );

            wxLogTrace( TRACE_CLIPBOARD,
                        wxT("selection received for targets, format %s"),
                        format.GetId().c_str() );

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

            if (format == clipboard->m_targetRequested)
            {
                clipboard->m_waiting = FALSE;
                clipboard->m_formatSupported = TRUE;
                return;
            }
        }
    }

    clipboard->m_waiting = FALSE;
}

//-----------------------------------------------------------------------------
// "selection_received" for the actual data
//-----------------------------------------------------------------------------

static void
selection_received( GtkWidget *WXUNUSED(widget),
                    GtkSelectionData *selection_data,
                    guint32 WXUNUSED(time),
                    wxClipboard *clipboard )
{
    if (!wxTheClipboard)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    wxDataObject *data_object = clipboard->m_receivedData;

    if (!data_object)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    if (selection_data->length <= 0)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    wxDataFormat format( selection_data->target );

    // make sure we got the data in the correct format
    if (!data_object->IsSupportedFormat( format ) )
    {
        clipboard->m_waiting = FALSE;
        return;
    }

#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"
//-----------------------------------------------------------------------------

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 );

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

    free(d);
}

//-----------------------------------------------------------------------------
// wxClipboard
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;
    m_waiting = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_data = (wxDataObject*) NULL;
    m_receivedData = (wxDataObject*) NULL;

    /* we use m_targetsWidget to query what formats are available */

    m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
    gtk_widget_realize( m_targetsWidget );

    gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
                        "selection_received",
                        GTK_SIGNAL_FUNC( targets_selection_received ),
                        (gpointer) this );

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

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

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_received",
                        GTK_SIGNAL_FUNC( selection_received ),
                        (gpointer) this );

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_clear_event",
                        GTK_SIGNAL_FUNC( selection_clear_clip ),
                        (gpointer) NULL );

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

    m_formatSupported = FALSE;
    m_targetRequested = 0;

    m_usePrimary = FALSE;
}

wxClipboard::~wxClipboard()
{
    Clear();

    if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
    if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
}

void wxClipboard::Clear()
{
    if (m_data)
    {
#if wxUSE_THREADS
        /* disable GUI threads */
#endif

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

            gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
                                     (guint32) GDK_CURRENT_TIME );

            while (m_waiting) gtk_main_iteration();
        }

        if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
        {
            m_waiting = TRUE;

            gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
                                     (guint32) GDK_CURRENT_TIME );

            while (m_waiting) gtk_main_iteration();
        }

        if (m_data)
        {
            delete m_data;
            m_data = (wxDataObject*) NULL;
        }

#if wxUSE_THREADS
        /* re-enable GUI threads */
#endif
    }

    m_targetRequested = 0;
    m_formatSupported = FALSE;
}

bool wxClipboard::Open()
{
    wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );

    m_open = TRUE;

    return TRUE;
}

bool wxClipboard::SetData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );

    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );

    Clear();

    return AddData( data );
}

bool wxClipboard::AddData( wxDataObject *data )
{
    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );

    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );

    // we can only store one wxDataObject
    Clear();

    m_data = data;

    // get formats from wxDataObjects
    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
    m_data->GetAllFormats( array );

    // primary selection or clipboard
    GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
                                     : g_clipboardAtom;


    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
    {
        wxLogTrace( TRACE_CLIPBOARD,
                    wxT("wxClipboard now supports atom %s"),
                    array[i].GetId().c_str() );

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

        gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                                  clipboard,
                                  array[i],
                                  0 );  /* what is info ? */
    }

    delete[] array;

    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
                        "selection_get",
                        GTK_SIGNAL_FUNC(selection_handler),
                        (gpointer) NULL );

#if wxUSE_THREADS
    /* disable GUI threads */
#endif

    /* Tell the world we offer clipboard data */
    bool res = (gtk_selection_owner_set( m_clipboardWidget,
                                         clipboard,
                                         (guint32) GDK_CURRENT_TIME ));

    if (m_usePrimary)
        m_ownsPrimarySelection = res;
    else
        m_ownsClipboard = res;

#if wxUSE_THREADS
    /* re-enable GUI threads */
#endif

    return res;
}

void wxClipboard::Close()
{
    wxCHECK_RET( m_open, wxT("clipboard not open") );

    m_open = FALSE;
}

bool wxClipboard::IsOpened() const
{
    return m_open;
}

bool wxClipboard::IsSupported( const wxDataFormat& format )
{
    /* reentrance problems */
    if (m_waiting) return FALSE;

    /* store requested format to be asked for by callbacks */
    m_targetRequested = format;

    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	#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
	11	#pragma implementation "clipbrd.h"
	12	#endif
	13
	14	// For compilers that support precompilation, includes "wx.h".
	15	#include "wx/wxprec.h"
	16
	17	#include "wx/clipbrd.h"
	18
	19	#if wxUSE_CLIPBOARD
	20
	21	#include "wx/dataobj.h"
	22	#include "wx/utils.h"
	23	#include "wx/log.h"
	24
	25	#include <glib.h>
	26	#include <gdk/gdk.h>
	27	#include <gtk/gtk.h>
	28
	29	//-----------------------------------------------------------------------------
	30	// thread system
	31	//-----------------------------------------------------------------------------
	32
	33	#if wxUSE_THREADS
	34	#endif
	35
	36	//-----------------------------------------------------------------------------
	37	// data
	38	//-----------------------------------------------------------------------------
	39
	40	GdkAtom g_clipboardAtom = 0;
	41	GdkAtom g_targetsAtom = 0;
	42
	43	#if defined(__WXGTK20__) && wxUSE_UNICODE
	44	extern GdkAtom g_altTextAtom;
	45	#endif
	46
	47	// the trace mask we use with wxLogTrace() - call
	48	// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
	49	// (there will be a lot of them!)
	50	static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
	51
	52	//-----------------------------------------------------------------------------
	53	// reminder
	54	//-----------------------------------------------------------------------------
	55
	56	/* The contents of a selection are returned in a GtkSelectionData
	57	structure. selection/target identify the request.
	58	type specifies the type of the return; if length < 0, and
	59	the data should be ignored. This structure has object semantics -
	60	no fields should be modified directly, they should not be created
	61	directly, and pointers to them should not be stored beyond the duration of
	62	a callback. (If the last is changed, we'll need to add reference
	63	counting)
	64
	65	struct _GtkSelectionData
	66	{
	67	GdkAtom selection;
	68	GdkAtom target;
	69	GdkAtom type;
	70	gint format;
	71	guchar *data;
	72	gint length;
	73	};
	74
	75	*/
	76
	77	//-----------------------------------------------------------------------------
	78	// "selection_received" for targets
	79	//-----------------------------------------------------------------------------
	80
	81	static void
	82	targets_selection_received( GtkWidget *WXUNUSED(widget),
	83	GtkSelectionData *selection_data,
	84	guint32 WXUNUSED(time),
	85	wxClipboard *clipboard )
	86	{
	87	if ( wxTheClipboard && selection_data->length > 0 )
	88	{
	89	// make sure we got the data in the correct form
	90	GdkAtom type = selection_data->type;
	91	if ( type != GDK_SELECTION_TYPE_ATOM )
	92	{
	93	if ( strcmp(gdk_atom_name(type), "TARGETS") )
	94	{
	95	wxLogTrace( TRACE_CLIPBOARD,
	96	_T("got unsupported clipboard target") );
	97
	98	clipboard->m_waiting = FALSE;
	99	return;
	100	}
	101	}
	102
	103	#ifdef __WXDEBUG__
	104	wxDataFormat clip( selection_data->selection );
	105	wxLogTrace( TRACE_CLIPBOARD,
	106	wxT("selection received for targets, clipboard %s"),
	107	clip.GetId().c_str() );
	108	#endif // __WXDEBUG__
	109
	110	// the atoms we received, holding a list of targets (= formats)
	111	GdkAtom atoms = (GdkAtom )selection_data->data;
	112
	113	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	114	{
	115	wxDataFormat format( atoms[i] );
	116
	117	wxLogTrace( TRACE_CLIPBOARD,
	118	wxT("selection received for targets, format %s"),
	119	format.GetId().c_str() );
	120
	121	// printf( "format %s requested %s\n",
	122	// gdk_atom_name( atoms[i] ),
	123	// gdk_atom_name( clipboard->m_targetRequested ) );
	124
	125	if (format == clipboard->m_targetRequested)
	126	{
	127	clipboard->m_waiting = FALSE;
	128	clipboard->m_formatSupported = TRUE;
	129	return;
	130	}
	131	}
	132	}
	133
	134	clipboard->m_waiting = FALSE;
	135	}
	136
	137	//-----------------------------------------------------------------------------
	138	// "selection_received" for the actual data
	139	//-----------------------------------------------------------------------------
	140
	141	static void
	142	selection_received( GtkWidget *WXUNUSED(widget),
	143	GtkSelectionData *selection_data,
	144	guint32 WXUNUSED(time),
	145	wxClipboard *clipboard )
	146	{
	147	if (!wxTheClipboard)
	148	{
	149	clipboard->m_waiting = FALSE;
	150	return;
	151	}
	152
	153	wxDataObject *data_object = clipboard->m_receivedData;
	154
	155	if (!data_object)
	156	{
	157	clipboard->m_waiting = FALSE;
	158	return;
	159	}
	160
	161	if (selection_data->length <= 0)
	162	{
	163	clipboard->m_waiting = FALSE;
	164	return;
	165	}
	166
	167	wxDataFormat format( selection_data->target );
	168
	169	// make sure we got the data in the correct format
	170	if (!data_object->IsSupportedFormat( format ) )
	171	{
	172	clipboard->m_waiting = FALSE;
	173	return;
	174	}
	175
	176	#if 0
	177	This seems to cause problems somehow
	178	// make sure we got the data in the correct form (selection type).
	179	// if so, copy data to target object
	180	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	181	{
	182	clipboard->m_waiting = FALSE;
	183	return;
	184	}
	185	#endif
	186
	187	data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
	188
	189	wxTheClipboard->m_formatSupported = TRUE;
	190	clipboard->m_waiting = FALSE;
	191	}
	192
	193	//-----------------------------------------------------------------------------
	194	// "selection_clear"
	195	//-----------------------------------------------------------------------------
	196
	197	static gint
	198	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	199	{
	200	if (!wxTheClipboard) return TRUE;
	201
	202	if (event->selection == GDK_SELECTION_PRIMARY)
	203	{
	204	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	205	}
	206	else
	207	if (event->selection == g_clipboardAtom)
	208	{
	209	wxTheClipboard->m_ownsClipboard = FALSE;
	210	}
	211	else
	212	{
	213	wxTheClipboard->m_waiting = FALSE;
	214	return FALSE;
	215	}
	216
	217	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	218	(!wxTheClipboard->m_ownsClipboard))
	219	{
	220	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	221	if (wxTheClipboard->m_data)
	222	{
	223	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	224
	225	delete wxTheClipboard->m_data;
	226	wxTheClipboard->m_data = (wxDataObject*) NULL;
	227	}
	228	}
	229
	230	wxTheClipboard->m_waiting = FALSE;
	231	return TRUE;
	232	}
	233
	234	//-----------------------------------------------------------------------------
	235	// selection handler for supplying data
	236	//-----------------------------------------------------------------------------
	237
	238	static void
	239	selection_handler( GtkWidget *WXUNUSED(widget),
	240	GtkSelectionData *selection_data,
	241	guint WXUNUSED(info),
	242	guint WXUNUSED(time),
	243	gpointer WXUNUSED(data) )
	244	{
	245	if (!wxTheClipboard) return;
	246
	247	if (!wxTheClipboard->m_data) return;
	248
	249	wxDataObject *data = wxTheClipboard->m_data;
	250
	251	wxDataFormat format( selection_data->target );
	252
	253	#ifdef __WXDEBUG__
	254	wxLogTrace(TRACE_CLIPBOARD,
	255	_T("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s"),
	256	format.GetId().c_str(),
	257	wxString::FromAscii(gdk_atom_name(selection_data->target)).c_str(),
	258	wxString::FromAscii(gdk_atom_name(selection_data->type)).c_str(),
	259	wxString::FromAscii(gdk_atom_name(selection_data->selection)).c_str()
	260	);
	261	#endif
	262
	263	if (!data->IsSupportedFormat( format )) return;
	264
	265	int size = data->GetDataSize( format );
	266
	267	if (size == 0) return;
	268
	269	void *d = malloc(size);
	270
	271	// Text data will be in UTF8 in Unicode mode.
	272	data->GetDataHere( selection_data->target, d );
	273
	274	#ifdef __WXGTK20__
	275	// NB: GTK+ requires special treatment of UTF8_STRING data, the text
	276	// would show as UTF-8 data interpreted as latin1 (?) in other
	277	// GTK+ apps if we used gtk_selection_data_set()
	278	if (format == wxDataFormat(wxDF_UNICODETEXT))
	279	{
	280	gtk_selection_data_set_text(
	281	selection_data,
	282	(const gchar*)d,
	283	size);
	284	}
	285	else
	286	#endif
	287	{
	288	gtk_selection_data_set(
	289	selection_data,
	290	GDK_SELECTION_TYPE_STRING,
	291	8*sizeof(gchar),
	292	(unsigned char*) d,
	293	size );
	294	}
	295
	296	free(d);
	297	}
	298
	299	//-----------------------------------------------------------------------------
	300	// wxClipboard
	301	//-----------------------------------------------------------------------------
	302
	303	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	304
	305	wxClipboard::wxClipboard()
	306	{
	307	m_open = FALSE;
	308	m_waiting = FALSE;
	309
	310	m_ownsClipboard = FALSE;
	311	m_ownsPrimarySelection = FALSE;
	312
	313	m_data = (wxDataObject*) NULL;
	314	m_receivedData = (wxDataObject*) NULL;
	315
	316	/* we use m_targetsWidget to query what formats are available */
	317
	318	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	319	gtk_widget_realize( m_targetsWidget );
	320
	321	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	322	"selection_received",
	323	GTK_SIGNAL_FUNC( targets_selection_received ),
	324	(gpointer) this );
	325
	326	/* we use m_clipboardWidget to get and to offer data */
	327
	328	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	329	gtk_widget_realize( m_clipboardWidget );
	330
	331	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	332	"selection_received",
	333	GTK_SIGNAL_FUNC( selection_received ),
	334	(gpointer) this );
	335
	336	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	337	"selection_clear_event",
	338	GTK_SIGNAL_FUNC( selection_clear_clip ),
	339	(gpointer) NULL );
	340
	341	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	342	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	343
	344	m_formatSupported = FALSE;
	345	m_targetRequested = 0;
	346
	347	m_usePrimary = FALSE;
	348	}
	349
	350	wxClipboard::~wxClipboard()
	351	{
	352	Clear();
	353
	354	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	355	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	356	}
	357
	358	void wxClipboard::Clear()
	359	{
	360	if (m_data)
	361	{
	362	#if wxUSE_THREADS
	363	/* disable GUI threads */
	364	#endif
	365
	366	// As we have data we also own the clipboard. Once we no longer own
	367	// it, clear_selection is called which will set m_data to zero
	368	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	369	{
	370	m_waiting = TRUE;
	371
	372	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	373	(guint32) GDK_CURRENT_TIME );
	374
	375	while (m_waiting) gtk_main_iteration();
	376	}
	377
	378	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	379	{
	380	m_waiting = TRUE;
	381
	382	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	383	(guint32) GDK_CURRENT_TIME );
	384
	385	while (m_waiting) gtk_main_iteration();
	386	}
	387
	388	if (m_data)
	389	{
	390	delete m_data;
	391	m_data = (wxDataObject*) NULL;
	392	}
	393
	394	#if wxUSE_THREADS
	395	/* re-enable GUI threads */
	396	#endif
	397	}
	398
	399	m_targetRequested = 0;
	400	m_formatSupported = FALSE;
	401	}
	402
	403	bool wxClipboard::Open()
	404	{
	405	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	406
	407	m_open = TRUE;
	408
	409	return TRUE;
	410	}
	411
	412	bool wxClipboard::SetData( wxDataObject *data )
	413	{
	414	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	415
	416	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	417
	418	Clear();
	419
	420	return AddData( data );
	421	}
	422
	423	bool wxClipboard::AddData( wxDataObject *data )
	424	{
	425	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	426
	427	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	428
	429	// we can only store one wxDataObject
	430	Clear();
	431
	432	m_data = data;
	433
	434	// get formats from wxDataObjects
	435	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	436	m_data->GetAllFormats( array );
	437
	438	// primary selection or clipboard
	439	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	440	: g_clipboardAtom;
	441
	442
	443	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	444	{
	445	wxLogTrace( TRACE_CLIPBOARD,
	446	wxT("wxClipboard now supports atom %s"),
	447	array[i].GetId().c_str() );
	448
	449	// printf( "added %s\n",
	450	// gdk_atom_name( array[i].GetFormatId() ) );
	451
	452	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	453	clipboard,
	454	array[i],
	455	0 ); /* what is info ? */
	456	}
	457
	458	delete[] array;
	459
	460	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	461	"selection_get",
	462	GTK_SIGNAL_FUNC(selection_handler),
	463	(gpointer) NULL );
	464
	465	#if wxUSE_THREADS
	466	/* disable GUI threads */
	467	#endif
	468
	469	/* Tell the world we offer clipboard data */
	470	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	471	clipboard,
	472	(guint32) GDK_CURRENT_TIME ));
	473
	474	if (m_usePrimary)
	475	m_ownsPrimarySelection = res;
	476	else
	477	m_ownsClipboard = res;
	478
	479	#if wxUSE_THREADS
	480	/* re-enable GUI threads */
	481	#endif
	482
	483	return res;
	484	}
	485
	486	void wxClipboard::Close()
	487	{
	488	wxCHECK_RET( m_open, wxT("clipboard not open") );
	489
	490	m_open = FALSE;
	491	}
	492
	493	bool wxClipboard::IsOpened() const
	494	{
	495	return m_open;
	496	}
	497
	498	bool wxClipboard::IsSupported( const wxDataFormat& format )
	499	{
	500	/* reentrance problems */
	501	if (m_waiting) return FALSE;
	502
	503	/* store requested format to be asked for by callbacks */
	504	m_targetRequested = format;
	505
	506	wxLogTrace( TRACE_CLIPBOARD,
	507	wxT("wxClipboard:IsSupported: requested format: %s"),
	508	format.GetId().c_str() );
	509
	510	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	511
	512	m_formatSupported = FALSE;
	513
	514	/* perform query. this will set m_formatSupported to
	515	TRUE if m_targetRequested is supported.
	516	also, we have to wait for the "answer" from the
	517	clipboard owner which is an asynchronous process.
	518	therefore we set m_waiting = TRUE here and wait
	519	until the callback "targets_selection_received"
	520	sets it to FALSE */
	521
	522	m_waiting = TRUE;
	523
	524	gtk_selection_convert( m_targetsWidget,
	525	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	526	: g_clipboardAtom,
	527	g_targetsAtom,
	528	(guint32) GDK_CURRENT_TIME );
	529
	530	while (m_waiting) gtk_main_iteration();
	531
	532	#if defined(__WXGTK20__) && wxUSE_UNICODE
	533	if (!m_formatSupported && format == wxDataFormat(wxDF_UNICODETEXT))
	534	{
	535	// Another try with plain STRING format
	536	extern GdkAtom g_altTextAtom;
	537	return IsSupported(g_altTextAtom);
	538	}
	539	#endif
	540
	541	return m_formatSupported;
	542	}
	543
	544	bool wxClipboard::GetData( wxDataObject& data )
	545	{
	546	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	547
	548	/* get formats from wxDataObjects */
	549	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	550	data.GetAllFormats( array );
	551
	552	for (size_t i = 0; i < data.GetFormatCount(); i++)
	553	{
	554	wxDataFormat format( array[i] );
	555
	556	wxLogTrace( TRACE_CLIPBOARD,
	557	wxT("wxClipboard::GetData: requested format: %s"),
	558	format.GetId().c_str() );
	559
	560	/* is data supported by clipboard ? */
	561
	562	/* store requested format to be asked for by callbacks */
	563	m_targetRequested = format;
	564
	565	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	566
	567	m_formatSupported = FALSE;
	568
	569	/* perform query. this will set m_formatSupported to
	570	TRUE if m_targetRequested is supported.
	571	also, we have to wait for the "answer" from the
	572	clipboard owner which is an asynchronous process.
	573	therefore we set m_waiting = TRUE here and wait
	574	until the callback "targets_selection_received"
	575	sets it to FALSE */
	576
	577	m_waiting = TRUE;
	578
	579	gtk_selection_convert( m_targetsWidget,
	580	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	581	: g_clipboardAtom,
	582	g_targetsAtom,
	583	(guint32) GDK_CURRENT_TIME );
	584
	585	while (m_waiting) gtk_main_iteration();
	586
	587	if (!m_formatSupported) continue;
	588
	589	/* store pointer to data object to be filled up by callbacks */
	590	m_receivedData = &data;
	591
	592	/* store requested format to be asked for by callbacks */
	593	m_targetRequested = format;
	594
	595	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	596
	597	/* start query */
	598	m_formatSupported = FALSE;
	599
	600	/* ask for clipboard contents. this will set
	601	m_formatSupported to TRUE if m_targetRequested
	602	is supported.
	603	also, we have to wait for the "answer" from the
	604	clipboard owner which is an asynchronous process.
	605	therefore we set m_waiting = TRUE here and wait
	606	until the callback "targets_selection_received"
	607	sets it to FALSE */
	608
	609	m_waiting = TRUE;
	610
	611	wxLogTrace( TRACE_CLIPBOARD,
	612	wxT("wxClipboard::GetData: format found, start convert") );
	613
	614	gtk_selection_convert( m_clipboardWidget,
	615	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	616	: g_clipboardAtom,
	617	m_targetRequested,
	618	(guint32) GDK_CURRENT_TIME );
	619
	620	while (m_waiting) gtk_main_iteration();
	621
	622	/* this is a true error as we checked for the presence of such data before */
	623	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	624
	625	/* return success */
	626	delete[] array;
	627	return TRUE;
	628	}
	629
	630	wxLogTrace( TRACE_CLIPBOARD,
	631	wxT("wxClipboard::GetData: format not found") );
	632
	633	/* return failure */
	634	delete[] array;
	635	return FALSE;
	636	}
	637
	638	#endif
	639	// wxUSE_CLIPBOARD
	640