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;

// 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 );

    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();

    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	// the trace mask we use with wxLogTrace() - call
	40	// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
	41	// (there will be a lot of them!)
	42	static const wxChar *TRACE_CLIPBOARD = _T("clipboard");
	43
	44	//-----------------------------------------------------------------------------
	45	// reminder
	46	//-----------------------------------------------------------------------------
	47
	48	/* The contents of a selection are returned in a GtkSelectionData
	49	structure. selection/target identify the request.
	50	type specifies the type of the return; if length < 0, and
	51	the data should be ignored. This structure has object semantics -
	52	no fields should be modified directly, they should not be created
	53	directly, and pointers to them should not be stored beyond the duration of
	54	a callback. (If the last is changed, we'll need to add reference
	55	counting)
	56
	57	struct _GtkSelectionData
	58	{
	59	GdkAtom selection;
	60	GdkAtom target;
	61	GdkAtom type;
	62	gint format;
	63	guchar *data;
	64	gint length;
	65	};
	66
	67	*/
	68
	69	//-----------------------------------------------------------------------------
	70	// "selection_received" for targets
	71	//-----------------------------------------------------------------------------
	72
	73	extern "C" {
	74	static void
	75	targets_selection_received( GtkWidget *WXUNUSED(widget),
	76	GtkSelectionData *selection_data,
	77	guint32 WXUNUSED(time),
	78	wxClipboard *clipboard )
	79	{
	80	if ( wxTheClipboard && selection_data->length > 0 )
	81	{
	82	// make sure we got the data in the correct form
	83	GdkAtom type = selection_data->type;
	84	if ( type != GDK_SELECTION_TYPE_ATOM )
	85	{
	86	if ( strcmp(gdk_atom_name(type), "TARGETS") )
	87	{
	88	wxLogTrace( TRACE_CLIPBOARD,
	89	_T("got unsupported clipboard target") );
	90
	91	clipboard->m_waiting = FALSE;
	92	return;
	93	}
	94	}
	95
	96	#ifdef __WXDEBUG__
	97	wxDataFormat clip( selection_data->selection );
	98	wxLogTrace( TRACE_CLIPBOARD,
	99	wxT("selection received for targets, clipboard %s"),
	100	clip.GetId().c_str() );
	101	#endif // __WXDEBUG__
	102
	103	// the atoms we received, holding a list of targets (= formats)
	104	GdkAtom atoms = (GdkAtom )selection_data->data;
	105
	106	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	107	{
	108	wxDataFormat format( atoms[i] );
	109
	110	wxLogTrace( TRACE_CLIPBOARD,
	111	wxT("selection received for targets, format %s"),
	112	format.GetId().c_str() );
	113
	114	// printf( "format %s requested %s\n",
	115	// gdk_atom_name( atoms[i] ),
	116	// gdk_atom_name( clipboard->m_targetRequested ) );
	117
	118	if (format == clipboard->m_targetRequested)
	119	{
	120	clipboard->m_waiting = FALSE;
	121	clipboard->m_formatSupported = TRUE;
	122	return;
	123	}
	124	}
	125	}
	126
	127	clipboard->m_waiting = FALSE;
	128	}
	129	}
	130
	131	//-----------------------------------------------------------------------------
	132	// "selection_received" for the actual data
	133	//-----------------------------------------------------------------------------
	134
	135	extern "C" {
	136	static void
	137	selection_received( GtkWidget *WXUNUSED(widget),
	138	GtkSelectionData *selection_data,
	139	guint32 WXUNUSED(time),
	140	wxClipboard *clipboard )
	141	{
	142	if (!wxTheClipboard)
	143	{
	144	clipboard->m_waiting = FALSE;
	145	return;
	146	}
	147
	148	wxDataObject *data_object = clipboard->m_receivedData;
	149
	150	if (!data_object)
	151	{
	152	clipboard->m_waiting = FALSE;
	153	return;
	154	}
	155
	156	if (selection_data->length <= 0)
	157	{
	158	clipboard->m_waiting = FALSE;
	159	return;
	160	}
	161
	162	wxDataFormat format( selection_data->target );
	163
	164	// make sure we got the data in the correct format
	165	if (!data_object->IsSupportedFormat( format ) )
	166	{
	167	clipboard->m_waiting = FALSE;
	168	return;
	169	}
	170
	171	#if 0
	172	This seems to cause problems somehow
	173	// make sure we got the data in the correct form (selection type).
	174	// if so, copy data to target object
	175	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	176	{
	177	clipboard->m_waiting = FALSE;
	178	return;
	179	}
	180	#endif
	181
	182	data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
	183
	184	wxTheClipboard->m_formatSupported = TRUE;
	185	clipboard->m_waiting = FALSE;
	186	}
	187	}
	188
	189	//-----------------------------------------------------------------------------
	190	// "selection_clear"
	191	//-----------------------------------------------------------------------------
	192
	193	extern "C" {
	194	static gint
	195	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	196	{
	197	if (!wxTheClipboard) return TRUE;
	198
	199	if (event->selection == GDK_SELECTION_PRIMARY)
	200	{
	201	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	202	}
	203	else
	204	if (event->selection == g_clipboardAtom)
	205	{
	206	wxTheClipboard->m_ownsClipboard = FALSE;
	207	}
	208	else
	209	{
	210	wxTheClipboard->m_waiting = FALSE;
	211	return FALSE;
	212	}
	213
	214	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	215	(!wxTheClipboard->m_ownsClipboard))
	216	{
	217	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	218	if (wxTheClipboard->m_data)
	219	{
	220	wxLogTrace(TRACE_CLIPBOARD, wxT("wxClipboard will get cleared" ));
	221
	222	delete wxTheClipboard->m_data;
	223	wxTheClipboard->m_data = (wxDataObject*) NULL;
	224	}
	225	}
	226
	227	wxTheClipboard->m_waiting = FALSE;
	228	return TRUE;
	229	}
	230	}
	231
	232	//-----------------------------------------------------------------------------
	233	// selection handler for supplying data
	234	//-----------------------------------------------------------------------------
	235
	236	extern "C" {
	237	static void
	238	selection_handler( GtkWidget *WXUNUSED(widget),
	239	GtkSelectionData *selection_data,
	240	guint WXUNUSED(info),
	241	guint WXUNUSED(time),
	242	gpointer WXUNUSED(data) )
	243	{
	244	if (!wxTheClipboard) return;
	245
	246	if (!wxTheClipboard->m_data) return;
	247
	248	wxDataObject *data = wxTheClipboard->m_data;
	249
	250	wxDataFormat format( selection_data->target );
	251
	252	#ifdef __WXDEBUG__
	253	wxLogTrace(TRACE_CLIPBOARD,
	254	_T("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s"),
	255	format.GetId().c_str(),
	256	wxString::FromAscii(gdk_atom_name(selection_data->target)).c_str(),
	257	wxString::FromAscii(gdk_atom_name(selection_data->type)).c_str(),
	258	wxString::FromAscii(gdk_atom_name(selection_data->selection)).c_str()
	259	);
	260	#endif
	261
	262	if (!data->IsSupportedFormat( format )) return;
	263
	264	int size = data->GetDataSize( format );
	265
	266	if (size == 0) return;
	267
	268	void *d = malloc(size);
	269
	270	// Text data will be in UTF8 in Unicode mode.
	271	data->GetDataHere( selection_data->target, d );
	272
	273	gtk_selection_data_set(
	274	selection_data,
	275	GDK_SELECTION_TYPE_STRING,
	276	8 * sizeof(gchar),
	277	(unsigned char*) d,
	278	size-1 );
	279
	280	free(d);
	281	}
	282	}
	283
	284	//-----------------------------------------------------------------------------
	285	// wxClipboard
	286	//-----------------------------------------------------------------------------
	287
	288	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	289
	290	wxClipboard::wxClipboard()
	291	{
	292	m_open = FALSE;
	293	m_waiting = FALSE;
	294
	295	m_ownsClipboard = FALSE;
	296	m_ownsPrimarySelection = FALSE;
	297
	298	m_data = (wxDataObject*) NULL;
	299	m_receivedData = (wxDataObject*) NULL;
	300
	301	/* we use m_targetsWidget to query what formats are available */
	302
	303	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	304	gtk_widget_realize( m_targetsWidget );
	305
	306	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	307	"selection_received",
	308	GTK_SIGNAL_FUNC( targets_selection_received ),
	309	(gpointer) this );
	310
	311	/* we use m_clipboardWidget to get and to offer data */
	312
	313	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	314	gtk_widget_realize( m_clipboardWidget );
	315
	316	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	317	"selection_received",
	318	GTK_SIGNAL_FUNC( selection_received ),
	319	(gpointer) this );
	320
	321	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	322	"selection_clear_event",
	323	GTK_SIGNAL_FUNC( selection_clear_clip ),
	324	(gpointer) NULL );
	325
	326	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	327	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	328
	329	m_formatSupported = FALSE;
	330	m_targetRequested = 0;
	331
	332	m_usePrimary = FALSE;
	333	}
	334
	335	wxClipboard::~wxClipboard()
	336	{
	337	Clear();
	338
	339	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	340	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	341	}
	342
	343	void wxClipboard::Clear()
	344	{
	345	if (m_data)
	346	{
	347	#if wxUSE_THREADS
	348	/* disable GUI threads */
	349	#endif
	350
	351	// As we have data we also own the clipboard. Once we no longer own
	352	// it, clear_selection is called which will set m_data to zero
	353	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	354	{
	355	m_waiting = TRUE;
	356
	357	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom,
	358	(guint32) GDK_CURRENT_TIME );
	359
	360	while (m_waiting) gtk_main_iteration();
	361	}
	362
	363	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	364	{
	365	m_waiting = TRUE;
	366
	367	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
	368	(guint32) GDK_CURRENT_TIME );
	369
	370	while (m_waiting) gtk_main_iteration();
	371	}
	372
	373	if (m_data)
	374	{
	375	delete m_data;
	376	m_data = (wxDataObject*) NULL;
	377	}
	378
	379	#if wxUSE_THREADS
	380	/* re-enable GUI threads */
	381	#endif
	382	}
	383
	384	m_targetRequested = 0;
	385	m_formatSupported = FALSE;
	386	}
	387
	388	bool wxClipboard::Open()
	389	{
	390	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	391
	392	m_open = TRUE;
	393
	394	return TRUE;
	395	}
	396
	397	bool wxClipboard::SetData( wxDataObject *data )
	398	{
	399	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	400
	401	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	402
	403	Clear();
	404
	405	return AddData( data );
	406	}
	407
	408	bool wxClipboard::AddData( wxDataObject *data )
	409	{
	410	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	411
	412	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	413
	414	// we can only store one wxDataObject
	415	Clear();
	416
	417	m_data = data;
	418
	419	// get formats from wxDataObjects
	420	wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
	421	m_data->GetAllFormats( array );
	422
	423	// primary selection or clipboard
	424	GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	425	: g_clipboardAtom;
	426
	427
	428	for (size_t i = 0; i < m_data->GetFormatCount(); i++)
	429	{
	430	wxLogTrace( TRACE_CLIPBOARD,
	431	wxT("wxClipboard now supports atom %s"),
	432	array[i].GetId().c_str() );
	433
	434	// printf( "added %s\n",
	435	// gdk_atom_name( array[i].GetFormatId() ) );
	436
	437	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	438	clipboard,
	439	array[i],
	440	0 ); /* what is info ? */
	441	}
	442
	443	delete[] array;
	444
	445	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	446	"selection_get",
	447	GTK_SIGNAL_FUNC(selection_handler),
	448	(gpointer) NULL );
	449
	450	#if wxUSE_THREADS
	451	/* disable GUI threads */
	452	#endif
	453
	454	/* Tell the world we offer clipboard data */
	455	bool res = (gtk_selection_owner_set( m_clipboardWidget,
	456	clipboard,
	457	(guint32) GDK_CURRENT_TIME ));
	458
	459	if (m_usePrimary)
	460	m_ownsPrimarySelection = res;
	461	else
	462	m_ownsClipboard = res;
	463
	464	#if wxUSE_THREADS
	465	/* re-enable GUI threads */
	466	#endif
	467
	468	return res;
	469	}
	470
	471	void wxClipboard::Close()
	472	{
	473	wxCHECK_RET( m_open, wxT("clipboard not open") );
	474
	475	m_open = FALSE;
	476	}
	477
	478	bool wxClipboard::IsOpened() const
	479	{
	480	return m_open;
	481	}
	482
	483	bool wxClipboard::IsSupported( const wxDataFormat& format )
	484	{
	485	/* reentrance problems */
	486	if (m_waiting) return FALSE;
	487
	488	/* store requested format to be asked for by callbacks */
	489	m_targetRequested = format;
	490
	491	wxLogTrace( TRACE_CLIPBOARD,
	492	wxT("wxClipboard:IsSupported: requested format: %s"),
	493	format.GetId().c_str() );
	494
	495	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	496
	497	m_formatSupported = FALSE;
	498
	499	/* perform query. this will set m_formatSupported to
	500	TRUE if m_targetRequested is supported.
	501	also, we have to wait for the "answer" from the
	502	clipboard owner which is an asynchronous process.
	503	therefore we set m_waiting = TRUE here and wait
	504	until the callback "targets_selection_received"
	505	sets it to FALSE */
	506
	507	m_waiting = TRUE;
	508
	509	gtk_selection_convert( m_targetsWidget,
	510	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	511	: g_clipboardAtom,
	512	g_targetsAtom,
	513	(guint32) GDK_CURRENT_TIME );
	514
	515	while (m_waiting) gtk_main_iteration();
	516
	517	return m_formatSupported;
	518	}
	519
	520	bool wxClipboard::GetData( wxDataObject& data )
	521	{
	522	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	523
	524	/* get formats from wxDataObjects */
	525	wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
	526	data.GetAllFormats( array );
	527
	528	for (size_t i = 0; i < data.GetFormatCount(); i++)
	529	{
	530	wxDataFormat format( array[i] );
	531
	532	wxLogTrace( TRACE_CLIPBOARD,
	533	wxT("wxClipboard::GetData: requested format: %s"),
	534	format.GetId().c_str() );
	535
	536	/* is data supported by clipboard ? */
	537
	538	/* store requested format to be asked for by callbacks */
	539	m_targetRequested = format;
	540
	541	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	542
	543	m_formatSupported = FALSE;
	544
	545	/* perform query. this will set m_formatSupported to
	546	TRUE if m_targetRequested is supported.
	547	also, we have to wait for the "answer" from the
	548	clipboard owner which is an asynchronous process.
	549	therefore we set m_waiting = TRUE here and wait
	550	until the callback "targets_selection_received"
	551	sets it to FALSE */
	552
	553	m_waiting = TRUE;
	554
	555	gtk_selection_convert( m_targetsWidget,
	556	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	557	: g_clipboardAtom,
	558	g_targetsAtom,
	559	(guint32) GDK_CURRENT_TIME );
	560
	561	while (m_waiting) gtk_main_iteration();
	562
	563	if (!m_formatSupported) continue;
	564
	565	/* store pointer to data object to be filled up by callbacks */
	566	m_receivedData = &data;
	567
	568	/* store requested format to be asked for by callbacks */
	569	m_targetRequested = format;
	570
	571	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	572
	573	/* start query */
	574	m_formatSupported = FALSE;
	575
	576	/* ask for clipboard contents. this will set
	577	m_formatSupported to TRUE if m_targetRequested
	578	is supported.
	579	also, we have to wait for the "answer" from the
	580	clipboard owner which is an asynchronous process.
	581	therefore we set m_waiting = TRUE here and wait
	582	until the callback "targets_selection_received"
	583	sets it to FALSE */
	584
	585	m_waiting = TRUE;
	586
	587	wxLogTrace( TRACE_CLIPBOARD,
	588	wxT("wxClipboard::GetData: format found, start convert") );
	589
	590	gtk_selection_convert( m_clipboardWidget,
	591	m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
	592	: g_clipboardAtom,
	593	m_targetRequested,
	594	(guint32) GDK_CURRENT_TIME );
	595
	596	while (m_waiting) gtk_main_iteration();
	597
	598	/* this is a true error as we checked for the presence of such data before */
	599	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	600
	601	/* return success */
	602	delete[] array;
	603	return TRUE;
	604	}
	605
	606	wxLogTrace( TRACE_CLIPBOARD,
	607	wxT("wxClipboard::GetData: format not found") );
	608
	609	/* return failure */
	610	delete[] array;
	611	return FALSE;
	612	}
	613
	614	#endif
	615	// wxUSE_CLIPBOARD
	616