src/gtk/clipbrd.cpp

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

#ifdef __GNUG__
#pragma implementation "clipbrd.h"
#endif

#include "wx/clipbrd.h"

#if wxUSE_CLIPBOARD

#include "wx/utils.h"

#include "glib.h"
#include "gdk/gdk.h"
#include "gtk/gtk.h"

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

#if wxUSE_THREADS
extern void wxapp_install_thread_wakeup();
extern void wxapp_uninstall_thread_wakeup();
#endif

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

wxClipboard *wxTheClipboard = (wxClipboard*) NULL;

GdkAtom  g_clipboardAtom   = 0;
GdkAtom  g_targetsAtom     = 0;

//-----------------------------------------------------------------------------
// reminder
//-----------------------------------------------------------------------------

/* The contents of a selection are returned in a GtkSelectionData
   structure. selection/target identify the request.
   type specifies the type of the return; if length < 0, and
   the data should be ignored. This structure has object semantics -
   no fields should be modified directly, they should not be created
   directly, and pointers to them should not be stored beyond the duration of
   a callback. (If the last is changed, we'll need to add reference
   counting)

struct _GtkSelectionData
{
  GdkAtom selection;
  GdkAtom target;
  GdkAtom type;
  gint	  format;
  guchar *data;
  gint	  length;
};

*/

//-----------------------------------------------------------------------------
// "selection_received" for targets
//-----------------------------------------------------------------------------

static void
targets_selection_received( GtkWidget *WXUNUSED(widget),
                            GtkSelectionData *selection_data,
#if (GTK_MINOR_VERSION > 0)
                            guint32 WXUNUSED(time),
#endif
		            wxClipboard *clipboard )
{
    if (!wxTheClipboard)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

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

    /* make sure we got the data in the correct form */
    if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    // 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++)
    {
/*        char *name = gdk_atom_name (atoms[i]);
        if (name) printf( "Format available: %s.\n", name ); */

        if (atoms[i] == clipboard->m_targetRequested)
        {
            clipboard->m_waiting = FALSE;
            clipboard->m_formatSupported = TRUE;
            return;
        }
    }

    clipboard->m_waiting = FALSE;
    return;
}

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

static void
selection_received( GtkWidget *WXUNUSED(widget),
                    GtkSelectionData *selection_data,
#if (GTK_MINOR_VERSION > 0)
                    guint32 WXUNUSED(time),
#endif
		    wxClipboard *clipboard )
{
    if (!wxTheClipboard)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    wxDataObject *data_object = clipboard->m_receivedData;

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

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

    /* make sure we got the data in the correct format */
    if (data_object->GetFormat().GetAtom() != selection_data->target)
    {
        clipboard->m_waiting = FALSE;
        return;
    }

    /* make sure we got the data in the correct form (selection type).
       if so, copy data to target object */

    switch (data_object->GetFormat().GetType())
    {
        case wxDF_TEXT:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_STRING)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    wxTextDataObject *text_object = (wxTextDataObject *) data_object;

	    wxString text = (const char*) selection_data->data;

	    text_object->SetText( text );

	    break;
	}

	case wxDF_BITMAP:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_STRING)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    wxBitmapDataObject *bitmap_object = (wxBitmapDataObject *) data_object;

	    bitmap_object->SetPngData( (const char*) selection_data->data, (size_t) selection_data->length );

	    break;
	}

	case wxDF_PRIVATE:
	{
            if (selection_data->type != GDK_SELECTION_TYPE_STRING)
            {
                clipboard->m_waiting = FALSE;
                return;
            }

	    wxPrivateDataObject *private_object = (wxPrivateDataObject *) data_object;

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

	    break;
	}

	default:
	{
            clipboard->m_waiting = FALSE;
	    return;
	}
    }

    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_dataBroker)
	{
	    delete wxTheClipboard->m_dataBroker;
	    wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	}
    }

    wxTheClipboard->m_waiting = FALSE;
    return TRUE;
}

//-----------------------------------------------------------------------------
// selection handler for supplying data
//-----------------------------------------------------------------------------

static void
selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) )
{
    if (!wxTheClipboard) return;

    if (!wxTheClipboard->m_dataBroker) return;

    wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();

    while (node)
    {
        wxDataObject *data_object = (wxDataObject *)node->Data();

	if (data_object->GetFormat().GetAtom() != selection_data->target)
	{
	    node = node->Next();
	    continue;
	}

	switch (data_object->GetFormat().GetType())
	{
	    case wxDF_TEXT:
	    {
	        wxTextDataObject *text_object = (wxTextDataObject*) data_object;

	        wxString text = text_object->GetText();

#if wxUSE_UNICODE
		const wxWX2MBbuf s = text.mbc_str();
		int len = strlen(s);
#else // more efficient in non-Unicode
		const char *s = text.c_str();
		int len = (int) text.Length();
#endif

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned char*) (const char*) s,
		    len );

		break;
	    }

	    case wxDF_BITMAP:
	    {
	        wxBitmapDataObject *bitmap_object = (wxBitmapDataObject*) data_object;

	        if (bitmap_object->GetSize() == 0) return;

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned char*) bitmap_object->GetData(),
		    (int) bitmap_object->GetSize() );

		break;
	    }

	    case wxDF_PRIVATE:
            {
	        wxPrivateDataObject *private_object = (wxPrivateDataObject*) data_object;

	        if (private_object->GetSize() == 0) return;

                gtk_selection_data_set(
                    selection_data,
		    GDK_SELECTION_TYPE_STRING,
		    8*sizeof(gchar),
		    (unsigned char*) private_object->GetData(),
		    (int) private_object->GetSize() );
	    }

	    default:
	      break;
        }

	node = node->Next();
    }
}

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = FALSE;

    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    m_dataBroker = (wxDataBroker*) 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_dataBroker)
    {
#if wxUSE_THREADS
        /* disable GUI threads */
        wxapp_uninstall_thread_wakeup();
#endif

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

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

            while (m_waiting) gtk_main_iteration();
        }

        if (m_dataBroker)
	{
	    delete m_dataBroker;
	    m_dataBroker = (wxDataBroker*) NULL;
	}

#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
    }

    m_targetRequested = 0;

    m_formatSupported = FALSE;
}

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

    m_open = TRUE;

    return TRUE;
}

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

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

    Clear();

    return AddData( data );
}

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

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

    /* if clipboard has been cleared before, create new data broker */
    if (!m_dataBroker) m_dataBroker = new wxDataBroker();

    /* add new data to list of offered data objects */
    m_dataBroker->Add( data );

    /* get native format id of new data object */
    GdkAtom format = data->GetFormat().GetAtom();

    wxCHECK_MSG( format, FALSE, _T("data has invalid format") );

    /* This should happen automatically, but to be on the safe side */
    m_ownsClipboard = FALSE;
    m_ownsPrimarySelection = FALSE;

    /* Add handlers if someone requests data */

#if (GTK_MINOR_VERSION > 0)

    gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                              GDK_SELECTION_PRIMARY,
			      format,
			      0 );  /* what is info ? */

    gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
                              g_clipboardAtom,
			      format,
			      0 );  /* what is info ? */

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

#else

    gtk_selection_add_handler( m_clipboardWidget,
                               g_clipboardAtom,
			       format,
			       selection_handler,
			       (gpointer) NULL );

    gtk_selection_add_handler( m_clipboardWidget,
                               GDK_SELECTION_PRIMARY,
			       format,
			       selection_handler,
			       (gpointer) NULL );
#endif

#if wxUSE_THREADS
        /* disable GUI threads */
        wxapp_uninstall_thread_wakeup();
#endif

    /* Tell the world we offer clipboard data */
    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  g_clipboardAtom,
				  GDK_CURRENT_TIME ))
    {
#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
        return FALSE;
    }
    m_ownsClipboard = TRUE;

    if (!gtk_selection_owner_set( m_clipboardWidget,
                                  GDK_SELECTION_PRIMARY,
				  GDK_CURRENT_TIME ))
    {
#if wxUSE_THREADS
        /* re-enable GUI threads */
        wxapp_install_thread_wakeup();
#endif
        return FALSE;
    }
    m_ownsPrimarySelection = TRUE;

#if wxUSE_THREADS
    /* re-enable GUI threads */
    wxapp_install_thread_wakeup();
#endif

    return TRUE;
}

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

    m_open = FALSE;
}

bool wxClipboard::IsSupported( wxDataFormat format )
{
    wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );

    /* store requested format to be asked for by callbacks */

    m_targetRequested = format.GetAtom();

    wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );

    m_formatSupported = FALSE;

    /* perform query. this will set m_formatSupported to
       TRUE if m_targetRequested is supported.
       alsom 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?GDK_SELECTION_PRIMARY:g_clipboardAtom,
			   g_targetsAtom,
			   GDK_CURRENT_TIME );

    while (m_waiting) gtk_main_iteration();

    if (!m_formatSupported) return FALSE;

    return TRUE;
}

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

    /* is data supported by clipboard ? */

    if (!IsSupported( data->GetFormat() )) return FALSE;

    /* 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 = data->GetFormat().GetAtom();

    wxCHECK_MSG( m_targetRequested, FALSE, _T("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;

    gtk_selection_convert( m_clipboardWidget,
			   m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
			   m_targetRequested,
			   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, _T("error retrieving data from clipboard") );

    return TRUE;
}

//-----------------------------------------------------------------------------
// wxClipboardModule
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)

bool wxClipboardModule::OnInit()
{
    wxTheClipboard = new wxClipboard();

    return TRUE;
}

void wxClipboardModule::OnExit()
{
    if (wxTheClipboard) delete wxTheClipboard;
    wxTheClipboard = (wxClipboard*) NULL;
}

#endif

  // wxUSE_CLIPBOARD
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: clipbrd.cpp
	3	// Purpose:
	4	// Author: Robert Roebling
	5	// Id: $Id$
	6	// Copyright: (c) 1998 Robert Roebling
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	#ifdef __GNUG__
	11	#pragma implementation "clipbrd.h"
	12	#endif
	13
	14	#include "wx/clipbrd.h"
	15
	16	#if wxUSE_CLIPBOARD
	17
	18	#include "wx/utils.h"
	19
	20	#include "glib.h"
	21	#include "gdk/gdk.h"
	22	#include "gtk/gtk.h"
	23
	24	//-----------------------------------------------------------------------------
	25	// thread system
	26	//-----------------------------------------------------------------------------
	27
	28	#if wxUSE_THREADS
	29	extern void wxapp_install_thread_wakeup();
	30	extern void wxapp_uninstall_thread_wakeup();
	31	#endif
	32
	33	//-----------------------------------------------------------------------------
	34	// data
	35	//-----------------------------------------------------------------------------
	36
	37	wxClipboard wxTheClipboard = (wxClipboard) NULL;
	38
	39	GdkAtom g_clipboardAtom = 0;
	40	GdkAtom g_targetsAtom = 0;
	41
	42	//-----------------------------------------------------------------------------
	43	// reminder
	44	//-----------------------------------------------------------------------------
	45
	46	/* The contents of a selection are returned in a GtkSelectionData
	47	structure. selection/target identify the request.
	48	type specifies the type of the return; if length < 0, and
	49	the data should be ignored. This structure has object semantics -
	50	no fields should be modified directly, they should not be created
	51	directly, and pointers to them should not be stored beyond the duration of
	52	a callback. (If the last is changed, we'll need to add reference
	53	counting)
	54
	55	struct _GtkSelectionData
	56	{
	57	GdkAtom selection;
	58	GdkAtom target;
	59	GdkAtom type;
	60	gint format;
	61	guchar *data;
	62	gint length;
	63	};
	64
	65	*/
	66
	67	//-----------------------------------------------------------------------------
	68	// "selection_received" for targets
	69	//-----------------------------------------------------------------------------
	70
	71	static void
	72	targets_selection_received( GtkWidget *WXUNUSED(widget),
	73	GtkSelectionData *selection_data,
	74	#if (GTK_MINOR_VERSION > 0)
	75	guint32 WXUNUSED(time),
	76	#endif
	77	wxClipboard *clipboard )
	78	{
	79	if (!wxTheClipboard)
	80	{
	81	clipboard->m_waiting = FALSE;
	82	return;
	83	}
	84
	85	if (selection_data->length <= 0)
	86	{
	87	clipboard->m_waiting = FALSE;
	88	return;
	89	}
	90
	91	/* make sure we got the data in the correct form */
	92	if (selection_data->type != GDK_SELECTION_TYPE_ATOM)
	93	{
	94	clipboard->m_waiting = FALSE;
	95	return;
	96	}
	97
	98	// the atoms we received, holding a list of targets (= formats)
	99	GdkAtom atoms = (GdkAtom )selection_data->data;
	100
	101	for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
	102	{
	103	/* char *name = gdk_atom_name (atoms[i]);
	104	if (name) printf( "Format available: %s.\n", name ); */
	105
	106	if (atoms[i] == clipboard->m_targetRequested)
	107	{
	108	clipboard->m_waiting = FALSE;
	109	clipboard->m_formatSupported = TRUE;
	110	return;
	111	}
	112	}
	113
	114	clipboard->m_waiting = FALSE;
	115	return;
	116	}
	117
	118	//-----------------------------------------------------------------------------
	119	// "selection_received" for the actual data
	120	//-----------------------------------------------------------------------------
	121
	122	static void
	123	selection_received( GtkWidget *WXUNUSED(widget),
	124	GtkSelectionData *selection_data,
	125	#if (GTK_MINOR_VERSION > 0)
	126	guint32 WXUNUSED(time),
	127	#endif
	128	wxClipboard *clipboard )
	129	{
	130	if (!wxTheClipboard)
	131	{
	132	clipboard->m_waiting = FALSE;
	133	return;
	134	}
	135
	136	wxDataObject *data_object = clipboard->m_receivedData;
	137
	138	if (!data_object)
	139	{
	140	clipboard->m_waiting = FALSE;
	141	return;
	142	}
	143
	144	if (selection_data->length <= 0)
	145	{
	146	clipboard->m_waiting = FALSE;
	147	return;
	148	}
	149
	150	/* make sure we got the data in the correct format */
	151	if (data_object->GetFormat().GetAtom() != selection_data->target)
	152	{
	153	clipboard->m_waiting = FALSE;
	154	return;
	155	}
	156
	157	/* make sure we got the data in the correct form (selection type).
	158	if so, copy data to target object */
	159
	160	switch (data_object->GetFormat().GetType())
	161	{
	162	case wxDF_TEXT:
	163	{
	164	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	165	{
	166	clipboard->m_waiting = FALSE;
	167	return;
	168	}
	169
	170	wxTextDataObject text_object = (wxTextDataObject ) data_object;
	171
	172	wxString text = (const char*) selection_data->data;
	173
	174	text_object->SetText( text );
	175
	176	break;
	177	}
	178
	179	case wxDF_BITMAP:
	180	{
	181	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	182	{
	183	clipboard->m_waiting = FALSE;
	184	return;
	185	}
	186
	187	wxBitmapDataObject bitmap_object = (wxBitmapDataObject ) data_object;
	188
	189	bitmap_object->SetPngData( (const char*) selection_data->data, (size_t) selection_data->length );
	190
	191	break;
	192	}
	193
	194	case wxDF_PRIVATE:
	195	{
	196	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	197	{
	198	clipboard->m_waiting = FALSE;
	199	return;
	200	}
	201
	202	wxPrivateDataObject private_object = (wxPrivateDataObject ) data_object;
	203
	204	private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
	205
	206	break;
	207	}
	208
	209	default:
	210	{
	211	clipboard->m_waiting = FALSE;
	212	return;
	213	}
	214	}
	215
	216	wxTheClipboard->m_formatSupported = TRUE;
	217	clipboard->m_waiting = FALSE;
	218	}
	219
	220	//-----------------------------------------------------------------------------
	221	// "selection_clear"
	222	//-----------------------------------------------------------------------------
	223
	224	static gint
	225	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	226	{
	227	if (!wxTheClipboard) return TRUE;
	228
	229	if (event->selection == GDK_SELECTION_PRIMARY)
	230	{
	231	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	232	}
	233	else
	234	if (event->selection == g_clipboardAtom)
	235	{
	236	wxTheClipboard->m_ownsClipboard = FALSE;
	237	}
	238	else
	239	{
	240	wxTheClipboard->m_waiting = FALSE;
	241	return FALSE;
	242	}
	243
	244	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	245	(!wxTheClipboard->m_ownsClipboard))
	246	{
	247	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	248	if (wxTheClipboard->m_dataBroker)
	249	{
	250	delete wxTheClipboard->m_dataBroker;
	251	wxTheClipboard->m_dataBroker = (wxDataBroker*) NULL;
	252	}
	253	}
	254
	255	wxTheClipboard->m_waiting = FALSE;
	256	return TRUE;
	257	}
	258
	259	//-----------------------------------------------------------------------------
	260	// selection handler for supplying data
	261	//-----------------------------------------------------------------------------
	262
	263	static void
	264	selection_handler( GtkWidget WXUNUSED(widget), GtkSelectionData selection_data, gpointer WXUNUSED(data) )
	265	{
	266	if (!wxTheClipboard) return;
	267
	268	if (!wxTheClipboard->m_dataBroker) return;
	269
	270	wxNode *node = wxTheClipboard->m_dataBroker->m_dataObjects.First();
	271
	272	while (node)
	273	{
	274	wxDataObject data_object = (wxDataObject )node->Data();
	275
	276	if (data_object->GetFormat().GetAtom() != selection_data->target)
	277	{
	278	node = node->Next();
	279	continue;
	280	}
	281
	282	switch (data_object->GetFormat().GetType())
	283	{
	284	case wxDF_TEXT:
	285	{
	286	wxTextDataObject text_object = (wxTextDataObject) data_object;
	287
	288	wxString text = text_object->GetText();
	289
	290	#if wxUSE_UNICODE
	291	const wxWX2MBbuf s = text.mbc_str();
	292	int len = strlen(s);
	293	#else // more efficient in non-Unicode
	294	const char *s = text.c_str();
	295	int len = (int) text.Length();
	296	#endif
	297
	298	gtk_selection_data_set(
	299	selection_data,
	300	GDK_SELECTION_TYPE_STRING,
	301	8*sizeof(gchar),
	302	(unsigned char) (const char) s,
	303	len );
	304
	305	break;
	306	}
	307
	308	case wxDF_BITMAP:
	309	{
	310	wxBitmapDataObject bitmap_object = (wxBitmapDataObject) data_object;
	311
	312	if (bitmap_object->GetSize() == 0) return;
	313
	314	gtk_selection_data_set(
	315	selection_data,
	316	GDK_SELECTION_TYPE_STRING,
	317	8*sizeof(gchar),
	318	(unsigned char*) bitmap_object->GetData(),
	319	(int) bitmap_object->GetSize() );
	320
	321	break;
	322	}
	323
	324	case wxDF_PRIVATE:
	325	{
	326	wxPrivateDataObject private_object = (wxPrivateDataObject) data_object;
	327
	328	if (private_object->GetSize() == 0) return;
	329
	330	gtk_selection_data_set(
	331	selection_data,
	332	GDK_SELECTION_TYPE_STRING,
	333	8*sizeof(gchar),
	334	(unsigned char*) private_object->GetData(),
	335	(int) private_object->GetSize() );
	336	}
	337
	338	default:
	339	break;
	340	}
	341
	342	node = node->Next();
	343	}
	344	}
	345
	346	//-----------------------------------------------------------------------------
	347	// wxClipboard
	348	//-----------------------------------------------------------------------------
	349
	350	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	351
	352	wxClipboard::wxClipboard()
	353	{
	354	m_open = FALSE;
	355
	356	m_ownsClipboard = FALSE;
	357	m_ownsPrimarySelection = FALSE;
	358
	359	m_dataBroker = (wxDataBroker*) NULL;
	360
	361	m_receivedData = (wxDataObject*) NULL;
	362
	363	/* we use m_targetsWidget to query what formats are available */
	364
	365	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	366	gtk_widget_realize( m_targetsWidget );
	367
	368	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	369	"selection_received",
	370	GTK_SIGNAL_FUNC( targets_selection_received ),
	371	(gpointer) this );
	372
	373	/* we use m_clipboardWidget to get and to offer data */
	374
	375	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	376	gtk_widget_realize( m_clipboardWidget );
	377
	378	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	379	"selection_received",
	380	GTK_SIGNAL_FUNC( selection_received ),
	381	(gpointer) this );
	382
	383	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	384	"selection_clear_event",
	385	GTK_SIGNAL_FUNC( selection_clear_clip ),
	386	(gpointer) NULL );
	387
	388	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	389	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	390
	391	m_formatSupported = FALSE;
	392	m_targetRequested = 0;
	393
	394	m_usePrimary = FALSE;
	395	}
	396
	397	wxClipboard::~wxClipboard()
	398	{
	399	Clear();
	400
	401	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	402	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	403	}
	404
	405	void wxClipboard::Clear()
	406	{
	407	if (m_dataBroker)
	408	{
	409	#if wxUSE_THREADS
	410	/* disable GUI threads */
	411	wxapp_uninstall_thread_wakeup();
	412	#endif
	413
	414	/* As we have data we also own the clipboard. Once we no longer own
	415	it, clear_selection is called which will set m_data to zero */
	416	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	417	{
	418	m_waiting = TRUE;
	419
	420	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	421
	422	while (m_waiting) gtk_main_iteration();
	423	}
	424
	425	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	426	{
	427	m_waiting = TRUE;
	428
	429	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	430
	431	while (m_waiting) gtk_main_iteration();
	432	}
	433
	434	if (m_dataBroker)
	435	{
	436	delete m_dataBroker;
	437	m_dataBroker = (wxDataBroker*) NULL;
	438	}
	439
	440	#if wxUSE_THREADS
	441	/* re-enable GUI threads */
	442	wxapp_install_thread_wakeup();
	443	#endif
	444	}
	445
	446	m_targetRequested = 0;
	447
	448	m_formatSupported = FALSE;
	449	}
	450
	451	bool wxClipboard::Open()
	452	{
	453	wxCHECK_MSG( !m_open, FALSE, _T("clipboard already open") );
	454
	455	m_open = TRUE;
	456
	457	return TRUE;
	458	}
	459
	460	bool wxClipboard::SetData( wxDataObject *data )
	461	{
	462	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	463
	464	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	465
	466	Clear();
	467
	468	return AddData( data );
	469	}
	470
	471	bool wxClipboard::AddData( wxDataObject *data )
	472	{
	473	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	474
	475	wxCHECK_MSG( data, FALSE, _T("data is invalid") );
	476
	477	/* if clipboard has been cleared before, create new data broker */
	478	if (!m_dataBroker) m_dataBroker = new wxDataBroker();
	479
	480	/* add new data to list of offered data objects */
	481	m_dataBroker->Add( data );
	482
	483	/* get native format id of new data object */
	484	GdkAtom format = data->GetFormat().GetAtom();
	485
	486	wxCHECK_MSG( format, FALSE, _T("data has invalid format") );
	487
	488	/* This should happen automatically, but to be on the safe side */
	489	m_ownsClipboard = FALSE;
	490	m_ownsPrimarySelection = FALSE;
	491
	492	/* Add handlers if someone requests data */
	493
	494	#if (GTK_MINOR_VERSION > 0)
	495
	496	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	497	GDK_SELECTION_PRIMARY,
	498	format,
	499	0 ); /* what is info ? */
	500
	501	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	502	g_clipboardAtom,
	503	format,
	504	0 ); /* what is info ? */
	505
	506	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	507	"selection_get",
	508	GTK_SIGNAL_FUNC(selection_handler),
	509	(gpointer) NULL );
	510
	511	#else
	512
	513	gtk_selection_add_handler( m_clipboardWidget,
	514	g_clipboardAtom,
	515	format,
	516	selection_handler,
	517	(gpointer) NULL );
	518
	519	gtk_selection_add_handler( m_clipboardWidget,
	520	GDK_SELECTION_PRIMARY,
	521	format,
	522	selection_handler,
	523	(gpointer) NULL );
	524	#endif
	525
	526	#if wxUSE_THREADS
	527	/* disable GUI threads */
	528	wxapp_uninstall_thread_wakeup();
	529	#endif
	530
	531	/* Tell the world we offer clipboard data */
	532	if (!gtk_selection_owner_set( m_clipboardWidget,
	533	g_clipboardAtom,
	534	GDK_CURRENT_TIME ))
	535	{
	536	#if wxUSE_THREADS
	537	/* re-enable GUI threads */
	538	wxapp_install_thread_wakeup();
	539	#endif
	540	return FALSE;
	541	}
	542	m_ownsClipboard = TRUE;
	543
	544	if (!gtk_selection_owner_set( m_clipboardWidget,
	545	GDK_SELECTION_PRIMARY,
	546	GDK_CURRENT_TIME ))
	547	{
	548	#if wxUSE_THREADS
	549	/* re-enable GUI threads */
	550	wxapp_install_thread_wakeup();
	551	#endif
	552	return FALSE;
	553	}
	554	m_ownsPrimarySelection = TRUE;
	555
	556	#if wxUSE_THREADS
	557	/* re-enable GUI threads */
	558	wxapp_install_thread_wakeup();
	559	#endif
	560
	561	return TRUE;
	562	}
	563
	564	void wxClipboard::Close()
	565	{
	566	wxCHECK_RET( m_open, _T("clipboard not open") );
	567
	568	m_open = FALSE;
	569	}
	570
	571	bool wxClipboard::IsSupported( wxDataFormat format )
	572	{
	573	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	574
	575	/* store requested format to be asked for by callbacks */
	576
	577	m_targetRequested = format.GetAtom();
	578
	579	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	580
	581	m_formatSupported = FALSE;
	582
	583	/* perform query. this will set m_formatSupported to
	584	TRUE if m_targetRequested is supported.
	585	alsom we have to wait for the "answer" from the
	586	clipboard owner which is an asynchronous process.
	587	therefore we set m_waiting = TRUE here and wait
	588	until the callback "targets_selection_received"
	589	sets it to FALSE */
	590
	591	m_waiting = TRUE;
	592
	593	gtk_selection_convert( m_targetsWidget,
	594	m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
	595	g_targetsAtom,
	596	GDK_CURRENT_TIME );
	597
	598	while (m_waiting) gtk_main_iteration();
	599
	600	if (!m_formatSupported) return FALSE;
	601
	602	return TRUE;
	603	}
	604
	605	bool wxClipboard::GetData( wxDataObject *data )
	606	{
	607	wxCHECK_MSG( m_open, FALSE, _T("clipboard not open") );
	608
	609	/* is data supported by clipboard ? */
	610
	611	if (!IsSupported( data->GetFormat() )) return FALSE;
	612
	613	/* store pointer to data object to be filled up by callbacks */
	614
	615	m_receivedData = data;
	616
	617	/* store requested format to be asked for by callbacks */
	618
	619	m_targetRequested = data->GetFormat().GetAtom();
	620
	621	wxCHECK_MSG( m_targetRequested, FALSE, _T("invalid clipboard format") );
	622
	623	/* start query */
	624
	625	m_formatSupported = FALSE;
	626
	627	/* ask for clipboard contents. this will set
	628	m_formatSupported to TRUE if m_targetRequested
	629	is supported.
	630	also, we have to wait for the "answer" from the
	631	clipboard owner which is an asynchronous process.
	632	therefore we set m_waiting = TRUE here and wait
	633	until the callback "targets_selection_received"
	634	sets it to FALSE */
	635
	636	m_waiting = TRUE;
	637
	638	gtk_selection_convert( m_clipboardWidget,
	639	m_usePrimary?GDK_SELECTION_PRIMARY:g_clipboardAtom,
	640	m_targetRequested,
	641	GDK_CURRENT_TIME );
	642
	643	while (m_waiting) gtk_main_iteration();
	644
	645	/* this is a true error as we checked for the presence of such data before */
	646
	647	wxCHECK_MSG( m_formatSupported, FALSE, _T("error retrieving data from clipboard") );
	648
	649	return TRUE;
	650	}
	651
	652	//-----------------------------------------------------------------------------
	653	// wxClipboardModule
	654	//-----------------------------------------------------------------------------
	655
	656	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	657
	658	bool wxClipboardModule::OnInit()
	659	{
	660	wxTheClipboard = new wxClipboard();
	661
	662	return TRUE;
	663	}
	664
	665	void wxClipboardModule::OnExit()
	666	{
	667	if (wxTheClipboard) delete wxTheClipboard;
	668	wxTheClipboard = (wxClipboard*) NULL;
	669	}
	670
	671	#endif
	672
	673	// wxUSE_CLIPBOARD
	674