src/gtk1/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() != 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 void*) 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_data)
	{
	    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, gpointer WXUNUSED(data) )
{
    if (!wxTheClipboard) return;

    if (!wxTheClipboard->m_data) return;

    wxDataObject *data = wxTheClipboard->m_data;

    if (!data->IsSupportedFormat( selection_data->target )) return;

    if (data->GetFormat().GetType() == wxDF_TEXT)
    {
	wxTextDataObject *text_object = (wxTextDataObject*) data;
	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 );

	return;
    }

    if (data->GetFormat().GetType() == wxDF_BITMAP)
    {
	wxBitmapDataObject *bitmap_object = (wxBitmapDataObject*) data;

	if (bitmap_object->GetDataSize(wxDF_BITMAP) == 0) return;

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

	return;
    }

    int size = data->GetDataSize( selection_data->target );

    if (size == 0) return;

    char *d = new char[size];

    data->GetDataHere( selection_data->target, (void*) d );

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

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

IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)

wxClipboard::wxClipboard()
{
    m_open = 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 */
        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_data)
        {
	    delete m_data;
	    m_data = (wxDataObject*) 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, 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 native format id of new data object */
    GdkAtom format = data->GetFormat();

    wxCHECK_MSG( format, FALSE, wxT("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, wxT("clipboard not open") );

    m_open = FALSE;
}

bool wxClipboard::IsSupported( wxDataFormat format )
{
    /* 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.
       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, wxT("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();

    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;

    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, wxT("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	/*
	104	char *name = gdk_atom_name (atoms[i]);
	105	if (name) printf( "Format available: %s.\n", name ); */
	106
	107	if (atoms[i] == clipboard->m_targetRequested)
	108	{
	109	clipboard->m_waiting = FALSE;
	110	clipboard->m_formatSupported = TRUE;
	111	return;
	112	}
	113	}
	114
	115	clipboard->m_waiting = FALSE;
	116	return;
	117	}
	118
	119	//-----------------------------------------------------------------------------
	120	// "selection_received" for the actual data
	121	//-----------------------------------------------------------------------------
	122
	123	static void
	124	selection_received( GtkWidget *WXUNUSED(widget),
	125	GtkSelectionData *selection_data,
	126	#if (GTK_MINOR_VERSION > 0)
	127	guint32 WXUNUSED(time),
	128	#endif
	129	wxClipboard *clipboard )
	130	{
	131	if (!wxTheClipboard)
	132	{
	133	clipboard->m_waiting = FALSE;
	134	return;
	135	}
	136
	137	wxDataObject *data_object = clipboard->m_receivedData;
	138
	139	if (!data_object)
	140	{
	141	clipboard->m_waiting = FALSE;
	142	return;
	143	}
	144
	145	if (selection_data->length <= 0)
	146	{
	147	clipboard->m_waiting = FALSE;
	148	return;
	149	}
	150
	151	/* make sure we got the data in the correct format */
	152	if (data_object->GetFormat() != selection_data->target)
	153	{
	154	clipboard->m_waiting = FALSE;
	155	return;
	156	}
	157
	158	/* make sure we got the data in the correct form (selection type).
	159	if so, copy data to target object */
	160
	161	switch (data_object->GetFormat().GetType())
	162	{
	163	case wxDF_TEXT:
	164	{
	165	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	166	{
	167	clipboard->m_waiting = FALSE;
	168	return;
	169	}
	170
	171	wxTextDataObject text_object = (wxTextDataObject ) data_object;
	172
	173	wxString text = (const char*) selection_data->data;
	174
	175	text_object->SetText( text );
	176
	177	break;
	178	}
	179
	180	case wxDF_BITMAP:
	181	{
	182	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	183	{
	184	clipboard->m_waiting = FALSE;
	185	return;
	186	}
	187
	188	wxBitmapDataObject bitmap_object = (wxBitmapDataObject ) data_object;
	189
	190	bitmap_object->SetPngData( (const void*) selection_data->data, (size_t) selection_data->length );
	191
	192	break;
	193	}
	194
	195	case wxDF_PRIVATE:
	196	{
	197	if (selection_data->type != GDK_SELECTION_TYPE_STRING)
	198	{
	199	clipboard->m_waiting = FALSE;
	200	return;
	201	}
	202
	203	wxPrivateDataObject private_object = (wxPrivateDataObject ) data_object;
	204
	205	private_object->SetData( (const char*) selection_data->data, (size_t) selection_data->length );
	206
	207	break;
	208	}
	209
	210	default:
	211	{
	212	clipboard->m_waiting = FALSE;
	213	return;
	214	}
	215	}
	216
	217	wxTheClipboard->m_formatSupported = TRUE;
	218	clipboard->m_waiting = FALSE;
	219	}
	220
	221	//-----------------------------------------------------------------------------
	222	// "selection_clear"
	223	//-----------------------------------------------------------------------------
	224
	225	static gint
	226	selection_clear_clip( GtkWidget WXUNUSED(widget), GdkEventSelection event )
	227	{
	228	if (!wxTheClipboard) return TRUE;
	229
	230	if (event->selection == GDK_SELECTION_PRIMARY)
	231	{
	232	wxTheClipboard->m_ownsPrimarySelection = FALSE;
	233	}
	234	else
	235	if (event->selection == g_clipboardAtom)
	236	{
	237	wxTheClipboard->m_ownsClipboard = FALSE;
	238	}
	239	else
	240	{
	241	wxTheClipboard->m_waiting = FALSE;
	242	return FALSE;
	243	}
	244
	245	if ((!wxTheClipboard->m_ownsPrimarySelection) &&
	246	(!wxTheClipboard->m_ownsClipboard))
	247	{
	248	/* the clipboard is no longer in our hands. we can the delete clipboard data. */
	249	if (wxTheClipboard->m_data)
	250	{
	251	delete wxTheClipboard->m_data;
	252	wxTheClipboard->m_data = (wxDataObject*) NULL;
	253	}
	254	}
	255
	256	wxTheClipboard->m_waiting = FALSE;
	257	return TRUE;
	258	}
	259
	260	//-----------------------------------------------------------------------------
	261	// selection handler for supplying data
	262	//-----------------------------------------------------------------------------
	263
	264	static void
	265	selection_handler( GtkWidget WXUNUSED(widget), GtkSelectionData selection_data, gpointer WXUNUSED(data) )
	266	{
	267	if (!wxTheClipboard) return;
	268
	269	if (!wxTheClipboard->m_data) return;
	270
	271	wxDataObject *data = wxTheClipboard->m_data;
	272
	273	if (!data->IsSupportedFormat( selection_data->target )) return;
	274
	275	if (data->GetFormat().GetType() == wxDF_TEXT)
	276	{
	277	wxTextDataObject text_object = (wxTextDataObject) data;
	278	wxString text( text_object->GetText() );
	279
	280	#if wxUSE_UNICODE
	281	const wxWX2MBbuf s = text.mbc_str();
	282	int len = strlen(s);
	283	#else // more efficient in non-Unicode
	284	const char *s = text.c_str();
	285	int len = (int) text.Length();
	286	#endif
	287	gtk_selection_data_set(
	288	selection_data,
	289	GDK_SELECTION_TYPE_STRING,
	290	8*sizeof(gchar),
	291	(unsigned char) (const char) s,
	292	len );
	293
	294	return;
	295	}
	296
	297	if (data->GetFormat().GetType() == wxDF_BITMAP)
	298	{
	299	wxBitmapDataObject bitmap_object = (wxBitmapDataObject) data;
	300
	301	if (bitmap_object->GetDataSize(wxDF_BITMAP) == 0) return;
	302
	303	gtk_selection_data_set(
	304	selection_data,
	305	GDK_SELECTION_TYPE_STRING,
	306	8*sizeof(gchar),
	307	(unsigned char*) bitmap_object->GetData(),
	308	(int) bitmap_object->GetDataSize(wxDF_BITMAP) );
	309
	310	return;
	311	}
	312
	313	int size = data->GetDataSize( selection_data->target );
	314
	315	if (size == 0) return;
	316
	317	char *d = new char[size];
	318
	319	data->GetDataHere( selection_data->target, (void*) d );
	320
	321	gtk_selection_data_set(
	322	selection_data,
	323	GDK_SELECTION_TYPE_STRING,
	324	8*sizeof(gchar),
	325	(unsigned char*) d,
	326	size );
	327	}
	328
	329	//-----------------------------------------------------------------------------
	330	// wxClipboard
	331	//-----------------------------------------------------------------------------
	332
	333	IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
	334
	335	wxClipboard::wxClipboard()
	336	{
	337	m_open = FALSE;
	338
	339	m_ownsClipboard = FALSE;
	340	m_ownsPrimarySelection = FALSE;
	341
	342	m_data = (wxDataObject*) NULL;
	343	m_receivedData = (wxDataObject*) NULL;
	344
	345	/* we use m_targetsWidget to query what formats are available */
	346
	347	m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP );
	348	gtk_widget_realize( m_targetsWidget );
	349
	350	gtk_signal_connect( GTK_OBJECT(m_targetsWidget),
	351	"selection_received",
	352	GTK_SIGNAL_FUNC( targets_selection_received ),
	353	(gpointer) this );
	354
	355	/* we use m_clipboardWidget to get and to offer data */
	356
	357	m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
	358	gtk_widget_realize( m_clipboardWidget );
	359
	360	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	361	"selection_received",
	362	GTK_SIGNAL_FUNC( selection_received ),
	363	(gpointer) this );
	364
	365	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	366	"selection_clear_event",
	367	GTK_SIGNAL_FUNC( selection_clear_clip ),
	368	(gpointer) NULL );
	369
	370	if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE );
	371	if (!g_targetsAtom) g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE);
	372
	373	m_formatSupported = FALSE;
	374	m_targetRequested = 0;
	375
	376	m_usePrimary = FALSE;
	377	}
	378
	379	wxClipboard::~wxClipboard()
	380	{
	381	Clear();
	382
	383	if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
	384	if (m_targetsWidget) gtk_widget_destroy( m_targetsWidget );
	385	}
	386
	387	void wxClipboard::Clear()
	388	{
	389	if (m_data)
	390	{
	391	#if wxUSE_THREADS
	392	/* disable GUI threads */
	393	wxapp_uninstall_thread_wakeup();
	394	#endif
	395
	396	/* As we have data we also own the clipboard. Once we no longer own
	397	it, clear_selection is called which will set m_data to zero */
	398	if (gdk_selection_owner_get( g_clipboardAtom ) == m_clipboardWidget->window)
	399	{
	400	m_waiting = TRUE;
	401
	402	gtk_selection_owner_set( (GtkWidget*) NULL, g_clipboardAtom, GDK_CURRENT_TIME );
	403
	404	while (m_waiting) gtk_main_iteration();
	405	}
	406
	407	if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
	408	{
	409	m_waiting = TRUE;
	410
	411	gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME );
	412
	413	while (m_waiting) gtk_main_iteration();
	414	}
	415
	416	if (m_data)
	417	{
	418	delete m_data;
	419	m_data = (wxDataObject*) NULL;
	420	}
	421
	422	#if wxUSE_THREADS
	423	/* re-enable GUI threads */
	424	wxapp_install_thread_wakeup();
	425	#endif
	426	}
	427
	428	m_targetRequested = 0;
	429	m_formatSupported = FALSE;
	430	}
	431
	432	bool wxClipboard::Open()
	433	{
	434	wxCHECK_MSG( !m_open, FALSE, wxT("clipboard already open") );
	435
	436	m_open = TRUE;
	437
	438	return TRUE;
	439	}
	440
	441	bool wxClipboard::SetData( wxDataObject *data )
	442	{
	443	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	444
	445	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	446
	447	Clear();
	448
	449	return AddData( data );
	450	}
	451
	452	bool wxClipboard::AddData( wxDataObject *data )
	453	{
	454	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	455
	456	wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
	457
	458	// we can only store one wxDataObject
	459	Clear();
	460
	461	m_data = data;
	462
	463	/* get native format id of new data object */
	464	GdkAtom format = data->GetFormat();
	465
	466	wxCHECK_MSG( format, FALSE, wxT("data has invalid format") );
	467
	468	/* This should happen automatically, but to be on the safe side */
	469	m_ownsClipboard = FALSE;
	470	m_ownsPrimarySelection = FALSE;
	471
	472	/* Add handlers if someone requests data */
	473
	474	#if (GTK_MINOR_VERSION > 0)
	475
	476	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	477	GDK_SELECTION_PRIMARY,
	478	format,
	479	0 ); /* what is info ? */
	480
	481	gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
	482	g_clipboardAtom,
	483	format,
	484	0 ); /* what is info ? */
	485
	486	gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
	487	"selection_get",
	488	GTK_SIGNAL_FUNC(selection_handler),
	489	(gpointer) NULL );
	490
	491	#else
	492
	493	gtk_selection_add_handler( m_clipboardWidget,
	494	g_clipboardAtom,
	495	format,
	496	selection_handler,
	497	(gpointer) NULL );
	498
	499	gtk_selection_add_handler( m_clipboardWidget,
	500	GDK_SELECTION_PRIMARY,
	501	format,
	502	selection_handler,
	503	(gpointer) NULL );
	504	#endif
	505
	506	#if wxUSE_THREADS
	507	/* disable GUI threads */
	508	wxapp_uninstall_thread_wakeup();
	509	#endif
	510
	511	/* Tell the world we offer clipboard data */
	512	if (!gtk_selection_owner_set( m_clipboardWidget,
	513	g_clipboardAtom,
	514	GDK_CURRENT_TIME ))
	515	{
	516	#if wxUSE_THREADS
	517	/* re-enable GUI threads */
	518	wxapp_install_thread_wakeup();
	519	#endif
	520	return FALSE;
	521	}
	522	m_ownsClipboard = TRUE;
	523
	524	if (!gtk_selection_owner_set( m_clipboardWidget,
	525	GDK_SELECTION_PRIMARY,
	526	GDK_CURRENT_TIME ))
	527	{
	528	#if wxUSE_THREADS
	529	/* re-enable GUI threads */
	530	wxapp_install_thread_wakeup();
	531	#endif
	532	return FALSE;
	533	}
	534	m_ownsPrimarySelection = TRUE;
	535
	536	#if wxUSE_THREADS
	537	/* re-enable GUI threads */
	538	wxapp_install_thread_wakeup();
	539	#endif
	540
	541	return TRUE;
	542	}
	543
	544	void wxClipboard::Close()
	545	{
	546	wxCHECK_RET( m_open, wxT("clipboard not open") );
	547
	548	m_open = FALSE;
	549	}
	550
	551	bool wxClipboard::IsSupported( wxDataFormat format )
	552	{
	553	/* store requested format to be asked for by callbacks */
	554
	555	m_targetRequested = format;
	556
	557	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	558
	559	m_formatSupported = FALSE;
	560
	561	/* perform query. this will set m_formatSupported to
	562	TRUE if m_targetRequested is supported.
	563	alsom we have to wait for the "answer" from the
	564	clipboard owner which is an asynchronous process.
	565	therefore we set m_waiting = TRUE here and wait
	566	until the callback "targets_selection_received"
	567	sets it to FALSE */
	568
	569	m_waiting = TRUE;
	570
	571	gtk_selection_convert( m_targetsWidget,
	572	m_usePrimary ? GDK_SELECTION_PRIMARY : g_clipboardAtom,
	573	g_targetsAtom,
	574	GDK_CURRENT_TIME );
	575
	576	while (m_waiting) gtk_main_iteration();
	577
	578	if (!m_formatSupported) return FALSE;
	579
	580	return TRUE;
	581	}
	582
	583	bool wxClipboard::GetData( wxDataObject *data )
	584	{
	585	wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
	586
	587	/* is data supported by clipboard ? */
	588
	589	if (!IsSupported( data->GetFormat() )) return FALSE;
	590
	591	/* store pointer to data object to be filled up by callbacks */
	592
	593	m_receivedData = data;
	594
	595	/* store requested format to be asked for by callbacks */
	596
	597	m_targetRequested = data->GetFormat();
	598
	599	wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
	600
	601	/* start query */
	602
	603	m_formatSupported = FALSE;
	604
	605	/* ask for clipboard contents. this will set
	606	m_formatSupported to TRUE if m_targetRequested
	607	is supported.
	608	also, we have to wait for the "answer" from the
	609	clipboard owner which is an asynchronous process.
	610	therefore we set m_waiting = TRUE here and wait
	611	until the callback "targets_selection_received"
	612	sets it to FALSE */
	613
	614	m_waiting = TRUE;
	615
	616	gtk_selection_convert( m_clipboardWidget,
	617	m_usePrimary ? GDK_SELECTION_PRIMARY : g_clipboardAtom,
	618	m_targetRequested,
	619	GDK_CURRENT_TIME );
	620
	621	while (m_waiting) gtk_main_iteration();
	622
	623	/* this is a true error as we checked for the presence of such data before */
	624
	625	wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
	626
	627	return TRUE;
	628	}
	629
	630	//-----------------------------------------------------------------------------
	631	// wxClipboardModule
	632	//-----------------------------------------------------------------------------
	633
	634	IMPLEMENT_DYNAMIC_CLASS(wxClipboardModule,wxModule)
	635
	636	bool wxClipboardModule::OnInit()
	637	{
	638	wxTheClipboard = new wxClipboard();
	639
	640	return TRUE;
	641	}
	642
	643	void wxClipboardModule::OnExit()
	644	{
	645	if (wxTheClipboard) delete wxTheClipboard;
	646	wxTheClipboard = (wxClipboard*) NULL;
	647	}
	648
	649	#endif
	650
	651	// wxUSE_CLIPBOARD
	652