X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fd0eed647daeb257f28699de879d2f4f5aeb7fb6..d636e0437c3fa41d9aa8b3d9a3efcf129c4bd48e:/src/gtk/clipbrd.cpp?ds=sidebyside diff --git a/src/gtk/clipbrd.cpp b/src/gtk/clipbrd.cpp index 2b77826901..56fa9e1eb8 100644 --- a/src/gtk/clipbrd.cpp +++ b/src/gtk/clipbrd.cpp @@ -1,184 +1,735 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: clipbrd.cpp -// Purpose: -// Author: Robert Roebling +// Name: src/gtk/clipbrd.cpp +// Purpose: wxClipboard implementation for wxGTK +// Author: Robert Roebling, Vadim Zeitlin // Id: $Id$ // Copyright: (c) 1998 Robert Roebling -// Licence: wxWindows licence +// (c) 2007 Vadim Zeitlin +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "clipbrd.h" -#endif +// ============================================================================ +// declarations +// ============================================================================ + +// ---------------------------------------------------------------------------- +// headers +// ---------------------------------------------------------------------------- + +// For compilers that support precompilation, includes "wx.h". +#include "wx/wxprec.h" + +#if wxUSE_CLIPBOARD #include "wx/clipbrd.h" -//----------------------------------------------------------------------------- +#ifndef WX_PRECOMP + #include "wx/app.h" + #include "wx/log.h" + #include "wx/utils.h" + #include "wx/dataobj.h" +#endif + +#include "wx/scopedarray.h" +#include "wx/scopeguard.h" +#include "wx/evtloop.h" + +#include "wx/gtk/private.h" + +typedef wxScopedArray wxDataFormatArray; + +// ---------------------------------------------------------------------------- // data -//----------------------------------------------------------------------------- +// ---------------------------------------------------------------------------- + +static GdkAtom g_clipboardAtom = 0; +static GdkAtom g_targetsAtom = 0; +static GdkAtom g_timestampAtom = 0; + +#if wxUSE_UNICODE +extern GdkAtom g_altTextAtom; +#endif + +// the trace mask we use with wxLogTrace() - call +// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here +// (there will be a *lot* of them!) +#define TRACE_CLIPBOARD wxT("clipboard") + +// ---------------------------------------------------------------------------- +// wxClipboardSync: used to perform clipboard operations synchronously +// ---------------------------------------------------------------------------- + +// constructing this object on stack will wait wait until the latest clipboard +// operation is finished on block exit +// +// notice that there can be no more than one such object alive at any moment, +// i.e. reentrancies are not allowed +class wxClipboardSync +{ +public: + wxClipboardSync(wxClipboard& clipboard) + { + wxASSERT_MSG( !ms_clipboard, wxT("reentrancy in clipboard code") ); + ms_clipboard = &clipboard; + } + + ~wxClipboardSync() + { + // ensure that there is a running event loop: this might not be the + // case if we're called before the main event loop startup + wxEventLoopGuarantor ensureEventLoop; + + while (ms_clipboard) + wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_CLIPBOARD); + } + + // this method must be called by GTK+ callbacks to indicate that we got the + // result for our clipboard operation + static void OnDone(wxClipboard * WXUNUSED_UNLESS_DEBUG(clipboard)) + { + wxASSERT_MSG( clipboard == ms_clipboard, + wxT("got notification for alien clipboard") ); + + ms_clipboard = NULL; + } + + // this method should be called if it's possible that no async clipboard + // operation is currently in progress (like it can be the case when the + // clipboard is cleared but not because we asked about it), it should only + // be called if such situation is expected -- otherwise call OnDone() which + // would assert in this case + static void OnDoneIfInProgress(wxClipboard *clipboard) + { + if ( ms_clipboard ) + OnDone(clipboard); + } -wxClipboard *wxTheClipboard = (wxClipboard*) NULL; +private: + static wxClipboard *ms_clipboard; -GdkAtom g_textAtom = 0; -GdkAtom g_clipboardAtom = 0; + wxDECLARE_NO_COPY_CLASS(wxClipboardSync); +}; + +wxClipboard *wxClipboardSync::ms_clipboard = NULL; + +// ============================================================================ +// clipboard callbacks implementation +// ============================================================================ //----------------------------------------------------------------------------- -// functions +// "selection_received" for targets //----------------------------------------------------------------------------- -void wxInitClipboard() +extern "C" { +static void +targets_selection_received( GtkWidget *WXUNUSED(widget), + GtkSelectionData *selection_data, + guint32 WXUNUSED(time), + wxClipboard *clipboard ) { - if (wxTheClipboard) delete wxTheClipboard; - wxTheClipboard = new wxClipboard(); + if ( !clipboard ) + return; + + wxON_BLOCK_EXIT1(wxClipboardSync::OnDone, clipboard); + + if ( !selection_data || selection_data->length <= 0 ) + return; + + // make sure we got the data in the correct form + GdkAtom type = selection_data->type; + if ( type != GDK_SELECTION_TYPE_ATOM ) + { + if ( strcmp(wxGtkString(gdk_atom_name(type)), "TARGETS") != 0 ) + { + wxLogTrace( TRACE_CLIPBOARD, + wxT("got unsupported clipboard target") ); + + return; + } + } + + // it's not really a format, of course, but we can reuse its GetId() method + // to format this atom as string + wxDataFormat clip(selection_data->selection); + wxLogTrace( TRACE_CLIPBOARD, + wxT("Received available formats for clipboard %s"), + clip.GetId().c_str() ); + + // the atoms we received, holding a list of targets (= formats) + const GdkAtom * const atoms = (GdkAtom *)selection_data->data; + for ( size_t i = 0; i < selection_data->length/sizeof(GdkAtom); i++ ) + { + const wxDataFormat format(atoms[i]); + + wxLogTrace(TRACE_CLIPBOARD, wxT("\t%s"), format.GetId().c_str()); + + if ( clipboard->GTKOnTargetReceived(format) ) + return; + } +} } -void wxDoneClipboard() +bool wxClipboard::GTKOnTargetReceived(const wxDataFormat& format) { - if (wxTheClipboard) delete wxTheClipboard; - wxTheClipboard = (wxClipboard*) NULL; + if ( format != m_targetRequested ) + return false; + + m_formatSupported = true; + return true; } //----------------------------------------------------------------------------- -// "selection_received" +// "selection_received" for the actual data //----------------------------------------------------------------------------- -static void -selection_received( GtkWidget *widget, GtkSelectionData *selection_data, gpointer data ) +extern "C" { +static void +selection_received( GtkWidget *WXUNUSED(widget), + GtkSelectionData *selection_data, + guint32 WXUNUSED(time), + wxClipboard *clipboard ) { + if ( !clipboard ) + return; + + wxON_BLOCK_EXIT1(wxClipboardSync::OnDone, clipboard); + + if ( !selection_data || selection_data->length <= 0 ) + return; + + clipboard->GTKOnSelectionReceived(*selection_data); +} } //----------------------------------------------------------------------------- // "selection_clear" //----------------------------------------------------------------------------- +extern "C" { static gint -selection_clear( GtkWidget *widget, GdkEventSelection *event ) +selection_clear_clip( GtkWidget *WXUNUSED(widget), GdkEventSelection *event ) { - /* The clipboard is no longer in our hands. We can delete the - * clipboard data. I hope I got that one right... */ - - if (!wxTheClipboard) return TRUE; - - wxTheClipboard->SetData( (wxDataObject*) NULL ); - - return TRUE; + wxClipboard * const clipboard = wxTheClipboard; + if ( !clipboard ) + return TRUE; + + // notice the use of OnDoneIfInProgress() here instead of just OnDone(): + // it's perfectly possible that we're receiving this notification from GTK+ + // even though we hadn't cleared the clipboard ourselves but because + // another application (or even another window in the same program) + // acquired it + wxON_BLOCK_EXIT1(wxClipboardSync::OnDoneIfInProgress, clipboard); + + wxClipboard::Kind kind; + if (event->selection == GDK_SELECTION_PRIMARY) + { + wxLogTrace(TRACE_CLIPBOARD, wxT("Lost primary selection" )); + + kind = wxClipboard::Primary; + } + else if (event->selection == g_clipboardAtom) + { + wxLogTrace(TRACE_CLIPBOARD, wxT("Lost clipboard" )); + + kind = wxClipboard::Clipboard; + } + else // some other selection, we're not concerned + { + return FALSE; + } + + // the clipboard is no longer in our hands, we don't need data any more + clipboard->GTKClearData(kind); + + return TRUE; +} } //----------------------------------------------------------------------------- // selection handler for supplying data //----------------------------------------------------------------------------- +extern "C" { static void -selection_handler( GtkWidget *WXUNUSED(widget), GtkSelectionData *selection_data, gpointer WXUNUSED(data) ) -{ - if (!wxTheClipboard) return; - - wxDataObject *data_object = wxTheClipboard->m_data; - - if (!data_object) return; - - if (data_object->GetDataSize() == 0) return; - - gint len = data_object->GetDataSize(); - guchar *bin_data = (guchar*) malloc( len ); - data_object->GetDataHere( (void*)bin_data ); - - if (selection_data->target == GDK_SELECTION_TYPE_STRING) - { - gtk_selection_data_set( - selection_data, GDK_SELECTION_TYPE_STRING, 8*sizeof(gchar), bin_data, len ); - } - else if (selection_data->target == g_textAtom) - { - gtk_selection_data_set( - selection_data, g_textAtom, 8*sizeof(gchar), bin_data, len ); - } - free( bin_data ); +selection_handler( GtkWidget *WXUNUSED(widget), + GtkSelectionData *selection_data, + guint WXUNUSED(info), + guint WXUNUSED(time), + gpointer signal_data ) +{ + wxClipboard * const clipboard = wxTheClipboard; + if ( !clipboard ) + return; + + wxDataObject * const data = clipboard->GTKGetDataObject(); + if ( !data ) + return; + + // ICCCM says that TIMESTAMP is a required atom. + // In particular, it satisfies Klipper, which polls + // TIMESTAMP to see if the clipboards content has changed. + // It shall return the time which was used to set the data. + if (selection_data->target == g_timestampAtom) + { + guint timestamp = GPOINTER_TO_UINT (signal_data); + gtk_selection_data_set(selection_data, + GDK_SELECTION_TYPE_INTEGER, + 32, + (guchar*)&(timestamp), + sizeof(timestamp)); + wxLogTrace(TRACE_CLIPBOARD, + wxT("Clipboard TIMESTAMP requested, returning timestamp=%u"), + timestamp); + return; + } + + wxDataFormat format( selection_data->target ); + + wxLogTrace(TRACE_CLIPBOARD, + wxT("clipboard data in format %s, GtkSelectionData is target=%s type=%s selection=%s timestamp=%u"), + format.GetId().c_str(), + wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->target))).c_str(), + wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->type))).c_str(), + wxString::FromAscii(wxGtkString(gdk_atom_name(selection_data->selection))).c_str(), + GPOINTER_TO_UINT( signal_data ) + ); + + if ( !data->IsSupportedFormat( format ) ) + return; + + int size = data->GetDataSize( format ); + if ( !size ) + return; + + wxCharBuffer buf(size - 1); // it adds 1 internally (for NUL) + + // text data must be returned in UTF8 if format is wxDF_UNICODETEXT + if ( !data->GetDataHere(format, buf.data()) ) + return; + + // use UTF8_STRING format if requested in Unicode build but just plain + // STRING one in ANSI or if explicitly asked in Unicode +#if wxUSE_UNICODE + if (format == wxDataFormat(wxDF_UNICODETEXT)) + { + gtk_selection_data_set_text( + selection_data, + (const gchar*)buf.data(), + size ); + } + else +#endif // wxUSE_UNICODE + { + gtk_selection_data_set( + selection_data, + GDK_SELECTION_TYPE_STRING, + 8*sizeof(gchar), + (const guchar*)buf.data(), + size ); + } +} +} + +void wxClipboard::GTKOnSelectionReceived(const GtkSelectionData& sel) +{ + wxCHECK_RET( m_receivedData, wxT("should be inside GetData()") ); + + const wxDataFormat format(sel.target); + wxLogTrace(TRACE_CLIPBOARD, wxT("Received selection %s"), + format.GetId().c_str()); + + if ( !m_receivedData->IsSupportedFormat(format) ) + return; + + m_receivedData->SetData(format, sel.length, sel.data); + m_formatSupported = true; } //----------------------------------------------------------------------------- -// wxClipboard +// asynchronous "selection_received" for targets //----------------------------------------------------------------------------- +extern "C" { +static void +async_targets_selection_received( GtkWidget *WXUNUSED(widget), + GtkSelectionData *selection_data, + guint32 WXUNUSED(time), + wxClipboard *clipboard ) +{ + if ( !clipboard ) // Assert? + return; + + if (!clipboard->m_sink) + return; + + wxClipboardEvent *event = new wxClipboardEvent(wxEVT_CLIPBOARD_CHANGED); + event->SetEventObject( clipboard ); + + if ( !selection_data || selection_data->length <= 0 ) + { + clipboard->m_sink->QueueEvent( event ); + clipboard->m_sink.Release(); + return; + } + + // make sure we got the data in the correct form + GdkAtom type = selection_data->type; + if ( type != GDK_SELECTION_TYPE_ATOM ) + { + if ( strcmp(wxGtkString(gdk_atom_name(type)), "TARGETS") != 0 ) + { + wxLogTrace( TRACE_CLIPBOARD, + wxT("got unsupported clipboard target") ); + + clipboard->m_sink->QueueEvent( event ); + clipboard->m_sink.Release(); + return; + } + } + + // it's not really a format, of course, but we can reuse its GetId() method + // to format this atom as string + wxDataFormat clip(selection_data->selection); + wxLogTrace( TRACE_CLIPBOARD, + wxT("Received available formats for clipboard %s"), + clip.GetId().c_str() ); + + // the atoms we received, holding a list of targets (= formats) + const GdkAtom * const atoms = (GdkAtom *)selection_data->data; + for ( size_t i = 0; i < selection_data->length/sizeof(GdkAtom); i++ ) + { + const wxDataFormat format(atoms[i]); + + wxLogTrace(TRACE_CLIPBOARD, wxT("\t%s"), format.GetId().c_str()); + + event->AddFormat( format ); + } + + clipboard->m_sink->QueueEvent( event ); + clipboard->m_sink.Release(); +} +} + +// ============================================================================ +// wxClipboard implementation +// ============================================================================ + +// ---------------------------------------------------------------------------- +// wxClipboard ctor/dtor +// ---------------------------------------------------------------------------- + IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject) wxClipboard::wxClipboard() { - m_data = (wxDataObject*) NULL; - m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP ); - gtk_widget_realize( m_clipboardWidget ); - - gtk_signal_connect( GTK_OBJECT(m_clipboardWidget), - "selection_clear_event", - GTK_SIGNAL_FUNC( selection_clear ), - (gpointer) NULL ); - - if (!g_clipboardAtom) g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE ); - if (!g_textAtom) g_textAtom = gdk_atom_intern( "TEXT", FALSE ); + m_open = false; + + m_dataPrimary = + m_dataClipboard = + m_receivedData = NULL; + + m_formatSupported = false; + m_targetRequested = 0; + + // we use m_targetsWidget to query what formats are available + m_targetsWidget = gtk_window_new( GTK_WINDOW_POPUP ); + gtk_widget_realize( m_targetsWidget ); + + g_signal_connect (m_targetsWidget, "selection_received", + G_CALLBACK (targets_selection_received), this); + + // we use m_targetsWidgetAsync to query what formats are available asynchronously + m_targetsWidgetAsync = gtk_window_new( GTK_WINDOW_POPUP ); + gtk_widget_realize( m_targetsWidgetAsync ); + + g_signal_connect (m_targetsWidgetAsync, "selection_received", + G_CALLBACK (async_targets_selection_received), this); + + // we use m_clipboardWidget to get and to offer data + m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP ); + gtk_widget_realize( m_clipboardWidget ); + + g_signal_connect (m_clipboardWidget, "selection_received", + G_CALLBACK (selection_received), this); + + g_signal_connect (m_clipboardWidget, "selection_clear_event", + G_CALLBACK (selection_clear_clip), NULL); + + // initialize atoms we use if not done yet + if ( !g_clipboardAtom ) + g_clipboardAtom = gdk_atom_intern( "CLIPBOARD", FALSE ); + if ( !g_targetsAtom ) + g_targetsAtom = gdk_atom_intern ("TARGETS", FALSE); + if ( !g_timestampAtom ) + g_timestampAtom = gdk_atom_intern ("TIMESTAMP", FALSE); } wxClipboard::~wxClipboard() { - /* 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 (m_data) - { - delete m_data; - gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME ); - } - if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget ); -} - -void wxClipboard::SetData( wxDataObject *data ) -{ - if (m_data) delete m_data; - m_data = data; - if (!m_data) return; - - if (!gtk_selection_owner_set( m_clipboardWidget, - g_clipboardAtom, - GDK_CURRENT_TIME)) - { - delete m_data; - m_data = (wxDataObject*) NULL; - return; - } - - switch (m_data->GetPreferredFormat()) - { -/* - case wxDF_STRING: - gtk_selection_add_handler( m_clipboardWidget, - g_clipboardAtom, - GDK_TARGET_STRING, - selection_handler, - NULL ); - break; -*/ - case wxDF_TEXT: - gtk_selection_add_handler( m_clipboardWidget, - g_clipboardAtom, - g_textAtom, - selection_handler, - NULL ); - break; - default: - break; - } -} - -void *wxClipboard::GetData( wxDataFormat format, size_t *length ) -{ - if (!IsAvailable(format)) - { - if (length) *length = 0; - return NULL; - } - return NULL; -} - -bool wxClipboard::IsAvailable( wxDataFormat WXUNUSED(format) ) -{ - return FALSE; + Clear(); + + gtk_widget_destroy( m_clipboardWidget ); + gtk_widget_destroy( m_targetsWidget ); +} + +// ---------------------------------------------------------------------------- +// wxClipboard helper functions +// ---------------------------------------------------------------------------- + +GdkAtom wxClipboard::GTKGetClipboardAtom() const +{ + return m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY + : g_clipboardAtom; +} + +void wxClipboard::GTKClearData(Kind kind) +{ + wxDataObject *&data = Data(kind); + if ( data ) + { + delete data; + data = NULL; + } +} + +bool wxClipboard::SetSelectionOwner(bool set) +{ + bool rc = gtk_selection_owner_set + ( + set ? m_clipboardWidget : NULL, + GTKGetClipboardAtom(), + (guint32)GDK_CURRENT_TIME + ); + + if ( !rc ) + { + wxLogTrace(TRACE_CLIPBOARD, wxT("Failed to %sset selection owner"), + set ? wxT("") : wxT("un")); + } + + return rc; +} + +void wxClipboard::AddSupportedTarget(GdkAtom atom) +{ + gtk_selection_add_target + ( + m_clipboardWidget, + GTKGetClipboardAtom(), + atom, + 0 // info (same as client data) unused + ); +} + +bool wxClipboard::IsSupportedAsync(wxEvtHandler *sink) +{ + if (m_sink.get()) + return false; // currently busy, come back later + + wxCHECK_MSG( sink, false, wxT("no sink given") ); + + m_sink = sink; + gtk_selection_convert( m_targetsWidgetAsync, + GTKGetClipboardAtom(), + g_targetsAtom, + (guint32) GDK_CURRENT_TIME ); + + return true; +} + +bool wxClipboard::DoIsSupported(const wxDataFormat& format) +{ + wxCHECK_MSG( format, false, wxT("invalid clipboard format") ); + + wxLogTrace(TRACE_CLIPBOARD, wxT("Checking if format %s is available"), + format.GetId().c_str()); + + // these variables will be used by our GTKOnTargetReceived() + m_targetRequested = format; + m_formatSupported = false; + + // block until m_formatSupported is set from targets_selection_received + // callback + { + wxClipboardSync sync(*this); + + gtk_selection_convert( m_targetsWidget, + GTKGetClipboardAtom(), + g_targetsAtom, + (guint32) GDK_CURRENT_TIME ); + } + + return m_formatSupported; +} + +// ---------------------------------------------------------------------------- +// wxClipboard public API implementation +// ---------------------------------------------------------------------------- + +void wxClipboard::Clear() +{ + gtk_selection_clear_targets( m_clipboardWidget, GTKGetClipboardAtom() ); + + if ( gdk_selection_owner_get(GTKGetClipboardAtom()) == + m_clipboardWidget->window ) + { + wxClipboardSync sync(*this); + + // this will result in selection_clear_clip callback being called and + // it will free our data + SetSelectionOwner(false); + } + + 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 so clear the old one + Clear(); + + Data() = data; + + // get formats from wxDataObjects + const size_t count = data->GetFormatCount(); + wxDataFormatArray formats(new wxDataFormat[count]); + data->GetAllFormats(formats.get()); + + // always provide TIMESTAMP as a target, see comments in selection_handler + // for explanation + AddSupportedTarget(g_timestampAtom); + + for ( size_t i = 0; i < count; i++ ) + { + const wxDataFormat format(formats[i]); + + wxLogTrace(TRACE_CLIPBOARD, wxT("Adding support for %s"), + format.GetId().c_str()); + + AddSupportedTarget(format); + } + + g_signal_connect (m_clipboardWidget, "selection_get", + G_CALLBACK (selection_handler), + GUINT_TO_POINTER (gtk_get_current_event_time()) ); + + // tell the world we offer clipboard data + return SetSelectionOwner(); +} + +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 ) +{ + if ( DoIsSupported(format) ) + return true; + +#if wxUSE_UNICODE + if ( format == wxDF_UNICODETEXT ) + { + // also with plain STRING format + return DoIsSupported(g_altTextAtom); + } +#endif // wxUSE_UNICODE + + return false; +} + +bool wxClipboard::GetData( wxDataObject& data ) +{ + wxCHECK_MSG( m_open, false, wxT("clipboard not open") ); + + // get all supported formats from wxDataObjects: notice that we are setting + // the object data, so we need them in "Set" direction + const size_t count = data.GetFormatCount(wxDataObject::Set); + wxDataFormatArray formats(new wxDataFormat[count]); + data.GetAllFormats(formats.get(), wxDataObject::Set); + + for ( size_t i = 0; i < count; i++ ) + { + const wxDataFormat format(formats[i]); + + // is this format supported by clipboard ? + if ( !DoIsSupported(format) ) + continue; + + wxLogTrace(TRACE_CLIPBOARD, wxT("Requesting format %s"), + format.GetId().c_str()); + + // these variables will be used by our GTKOnSelectionReceived() + m_receivedData = &data; + m_formatSupported = false; + + { + wxClipboardSync sync(*this); + + gtk_selection_convert(m_clipboardWidget, + GTKGetClipboardAtom(), + format, + (guint32) GDK_CURRENT_TIME ); + } // wait until we get the results + + /* + Normally this is a true error as we checked for the presence of such + data before, but there are applications that may return an empty + string (e.g. Gnumeric-1.6.1 on Linux if an empty cell is copied) + which would produce a false error message here, so we check for the + size of the string first. With ANSI, GetDataSize returns an extra + value (for the closing null?), with unicode, the exact number of + tokens is given (that is more than 1 for non-ASCII characters) + (tested with Gnumeric-1.6.1 and OpenOffice.org-2.0.2) + */ +#if wxUSE_UNICODE + if ( format != wxDF_UNICODETEXT || data.GetDataSize(format) > 0 ) +#else // !UNICODE + if ( format != wxDF_TEXT || data.GetDataSize(format) > 1 ) +#endif // UNICODE / !UNICODE + { + wxCHECK_MSG( m_formatSupported, false, + wxT("error retrieving data from clipboard") ); + } + + return true; + } + + wxLogTrace(TRACE_CLIPBOARD, wxT("GetData(): format not found")); + + return false; +} + +#endif // wxUSE_CLIPBOARD