moved wxDash typedef to gdicmn.h

[wxWidgets.git] / src / gtk / clipbrd.cpp

diff --git a/src/gtk/clipbrd.cpp b/src/gtk/clipbrd.cpp
index 48cd4598f40e6f877aeb787086aa747dfb2e7fc3..bfd34502bd093dbe5072221979d0b8f55ab728ca 100644 (file)
--- a/src/gtk/clipbrd.cpp
+++ b/src/gtk/clipbrd.cpp
@@ -1,10 +1,10 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        clipbrd.cpp
+// Name:        gtk/clipbrd.cpp

 // Purpose:
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
 // Purpose:
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling

-// Licence:    wxWindows licence
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__


@@ -13,37 +13,275 @@
 
 #include "wx/clipbrd.h"
 
 
 #include "wx/clipbrd.h"
 

+#if wxUSE_CLIPBOARD
+
+#include "wx/dataobj.h"
+#include "wx/utils.h"
+#include "wx/log.h"
+
+#include <glib.h>
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+
+//-----------------------------------------------------------------------------
+// thread system
+//-----------------------------------------------------------------------------
+
+#if wxUSE_THREADS
+extern void wxapp_install_thread_wakeup();
+extern void wxapp_uninstall_thread_wakeup();
+#endif
+

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

-wxClipboard *wxTheClipboard = (wxClipboard*) NULL;
+GdkAtom  g_clipboardAtom   = 0;
+GdkAtom  g_targetsAtom     = 0;
+
+// the trace mask we use with wxLogTrace() - call
+// wxLog::AddTraceMask(TRACE_CLIPBOARD) to enable the trace messages from here
+// (there will be a *lot* of them!)
+static const wxChar *TRACE_CLIPBOARD = _T("clipboard");

 
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------

-// functions
+// reminder

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

-void wxInitClipboard()
+/* 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

 {
 {

-  if (wxTheClipboard) delete wxTheClipboard;
-  wxTheClipboard = new wxClipboard();
+  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 && selection_data->length > 0 )
+    {
+        /* make sure we got the data in the correct form */
+        GdkAtom type = selection_data->type;
+        if ( type != GDK_SELECTION_TYPE_ATOM )
+        {
+            if ( strcmp(gdk_atom_name(type), "TARGETS") )
+            {
+                wxLogTrace( TRACE_CLIPBOARD,
+                            _T("got unsupported clipboard target") );
+
+                clipboard->m_waiting = FALSE;
+                return;
+            }
+        }
+
+#ifdef __WXDEBUG__
+        wxDataFormat clip( selection_data->selection );
+        wxLogTrace( TRACE_CLIPBOARD,
+                    wxT("selection received for targets, clipboard %s"),
+                    clip.GetId().c_str() );
+#endif // __WXDEBUG__
+
+        // the atoms we received, holding a list of targets (= formats)
+        GdkAtom *atoms = (GdkAtom *)selection_data->data;
+
+        for (unsigned int i=0; i<selection_data->length/sizeof(GdkAtom); i++)
+        {
+            wxDataFormat format( atoms[i] );
+
+            wxLogTrace( TRACE_CLIPBOARD,
+                        wxT("selection received for targets, format %s"),
+                        format.GetId().c_str() );
+
+            if (format == clipboard->m_targetRequested)
+            {
+                clipboard->m_waiting = FALSE;
+                clipboard->m_formatSupported = TRUE;
+                return;
+            }
+        }
+    }
+
+    clipboard->m_waiting = FALSE;

 }
 
 }
 

-void wxDoneClipboard()
+//-----------------------------------------------------------------------------
+// "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) delete wxTheClipboard;
-  wxTheClipboard = (wxClipboard*) NULL;
+    if (!wxTheClipboard)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    wxDataObject *data_object = clipboard->m_receivedData;
+
+    if (!data_object)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    if (selection_data->length <= 0)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    wxDataFormat format( selection_data->target );
+
+    /* make sure we got the data in the correct format */
+    if (!data_object->IsSupportedFormat( format ) )
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    /* make sure we got the data in the correct form (selection type).
+       if so, copy data to target object */
+    if (selection_data->type != GDK_SELECTION_TYPE_STRING)
+    {
+        clipboard->m_waiting = FALSE;
+        return;
+    }
+
+    data_object->SetData( format, (size_t) selection_data->length, (const char*) selection_data->data );
+
+    wxTheClipboard->m_formatSupported = TRUE;
+    clipboard->m_waiting = FALSE;

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------

-// "selection_received"
+// "selection_clear"

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

-/*
-static void selection_received( GtkWidget *widget, GtkSelectionData *selection_data, gpointer data )
+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)
+        {
+            wxLogDebug( wxT("wxClipboard will get cleared" ) );
+
+            delete wxTheClipboard->m_data;
+            wxTheClipboard->m_data = (wxDataObject*) NULL;
+        }
+    }
+
+    wxTheClipboard->m_waiting = FALSE;
+    return TRUE;
+}
+
+//-----------------------------------------------------------------------------
+// selection handler for supplying data
+//-----------------------------------------------------------------------------
+
+static void
+selection_handler( GtkWidget *WXUNUSED(widget),
+                   GtkSelectionData *selection_data,
+                   guint WXUNUSED(info),
+                   guint WXUNUSED(time),
+                   gpointer WXUNUSED(data) )
+{
+    if (!wxTheClipboard) return;
+
+    if (!wxTheClipboard->m_data) return;
+
+    wxDataObject *data = wxTheClipboard->m_data;
+
+    wxDataFormat format( selection_data->target );
+
+    if (!data->IsSupportedFormat( format )) return;
+
+    /* this will fail for composite formats */
+    if (format.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;
+    }
+
+    int size = data->GetDataSize( format );
+
+    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
 
 //-----------------------------------------------------------------------------
 // wxClipboard


@@ -53,34 +291,330 @@ IMPLEMENT_DYNAMIC_CLASS(wxClipboard,wxObject)
 
 wxClipboard::wxClipboard()
 {
 
 wxClipboard::wxClipboard()
 {

-  m_data = (wxDataObject*)NULL;
-  m_clipboardWidget = gtk_window_new( GTK_WINDOW_POPUP );
-  gtk_widget_realize( m_clipboardWidget );
+    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()
 {
 }
 
 wxClipboard::~wxClipboard()
 {

-  if (m_data) delete m_data;
-  if (m_clipboardWidget) gtk_widget_destroy( m_clipboardWidget );
+    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,
+                                     (guint32) GDK_CURRENT_TIME );
+
+            while (m_waiting) gtk_main_iteration();
+        }
+
+        if (gdk_selection_owner_get( GDK_SELECTION_PRIMARY ) == m_clipboardWidget->window)
+        {
+            m_waiting = TRUE;
+
+            gtk_selection_owner_set( (GtkWidget*) NULL, GDK_SELECTION_PRIMARY,
+                                     (guint32) GDK_CURRENT_TIME );
+
+            while (m_waiting) gtk_main_iteration();
+        }
+
+        if (m_data)
+        {
+            delete m_data;
+            m_data = (wxDataObject*) NULL;
+        }
+
+#if wxUSE_THREADS
+        /* re-enable GUI threads */
+        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;

 }
 
 }
 

-void wxClipboard::SetData( wxDataObject *data )
+bool wxClipboard::SetData( wxDataObject *data )

 {
 {

-  if (m_data) delete m_data;
-  m_data = data;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
+
+    Clear();
+
+    return AddData( data );

 }
 
 }
 

-void *wxClipboard::GetData( wxDataFormat format, size_t *length )
+bool wxClipboard::AddData( wxDataObject *data )

 {
 {

-  if (!IsAvailable(format))
-  {
-    if (length) *length = 0;
-    return NULL;
-  }
-  return NULL;
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+
+    wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
+
+    /* we can only store one wxDataObject */
+    Clear();
+
+    m_data = data;
+
+    /* get formats from wxDataObjects */
+    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
+    m_data->GetAllFormats( array );
+
+    /* primary selection or clipboard */
+    GdkAtom clipboard = m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                     : g_clipboardAtom;
+
+
+    for (size_t i = 0; i < m_data->GetFormatCount(); i++)
+    {
+        wxLogTrace( TRACE_CLIPBOARD,
+                    wxT("wxClipboard now supports atom %s"),
+                    array[i].GetId().c_str() );
+
+        gtk_selection_add_target( GTK_WIDGET(m_clipboardWidget),
+                                  clipboard,
+                                  array[i],
+                                  0 );  /* what is info ? */
+    }
+
+    delete[] array;
+
+    gtk_signal_connect( GTK_OBJECT(m_clipboardWidget),
+                        "selection_get",
+                        GTK_SIGNAL_FUNC(selection_handler),
+                        (gpointer) NULL );
+
+#if wxUSE_THREADS
+    /* disable GUI threads */
+    wxapp_uninstall_thread_wakeup();
+#endif
+
+    /* Tell the world we offer clipboard data */
+    bool res = (gtk_selection_owner_set( m_clipboardWidget,
+                                         clipboard,
+                                         (guint32) GDK_CURRENT_TIME ));
+
+    if (m_usePrimary)
+        m_ownsPrimarySelection = res;
+    else
+        m_ownsClipboard = res;
+
+#if wxUSE_THREADS
+    /* re-enable GUI threads */
+    wxapp_install_thread_wakeup();
+#endif
+
+    return res;
+}
+
+void wxClipboard::Close()
+{
+    wxCHECK_RET( m_open, wxT("clipboard not open") );
+
+    m_open = FALSE;

 }
 
 }
 

-bool wxClipboard::IsAvailable( wxDataFormat WXUNUSED(format) )
+bool wxClipboard::IsOpened() const

 {
 {

-  return FALSE;
+    return m_open;

 }
 }

+
+bool wxClipboard::IsSupported( const wxDataFormat& format )
+{
+    /* reentrance problems */
+    if (m_waiting) return FALSE;
+
+    /* store requested format to be asked for by callbacks */
+    m_targetRequested = format;
+
+#if 0
+    wxLogTrace( TRACE_CLIPBOARD,
+                wxT("wxClipboard:IsSupported: requested format: %s"),
+                format.GetId().c_str() );
+#endif
+
+    wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+
+    m_formatSupported = FALSE;
+
+    /* perform query. this will set m_formatSupported to
+       TRUE if m_targetRequested is supported.
+       also, we have to wait for the "answer" from the
+       clipboard owner which is an asynchronous process.
+       therefore we set m_waiting = TRUE here and wait
+       until the callback "targets_selection_received"
+       sets it to FALSE */
+
+    m_waiting = TRUE;
+
+    gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom,
+                           g_targetsAtom,
+                           (guint32) GDK_CURRENT_TIME );
+
+    while (m_waiting) gtk_main_iteration();
+
+    if (!m_formatSupported) return FALSE;
+
+    return TRUE;
+}
+
+bool wxClipboard::GetData( wxDataObject& data )
+{
+    wxCHECK_MSG( m_open, FALSE, wxT("clipboard not open") );
+
+    /* get formats from wxDataObjects */
+    wxDataFormat *array = new wxDataFormat[ data.GetFormatCount() ];
+    data.GetAllFormats( array );
+
+    for (size_t i = 0; i < data.GetFormatCount(); i++)
+    {
+        wxDataFormat format( array[i] );
+
+        wxLogTrace( TRACE_CLIPBOARD,
+                    wxT("wxClipboard::GetData: requested format: %s"),
+                    format.GetId().c_str() );
+
+        /* is data supported by clipboard ? */
+
+        /* store requested format to be asked for by callbacks */
+        m_targetRequested = format;
+
+        wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+
+        m_formatSupported = FALSE;
+
+       /* perform query. this will set m_formatSupported to
+          TRUE if m_targetRequested is supported.
+          also, we have to wait for the "answer" from the
+          clipboard owner which is an asynchronous process.
+          therefore we set m_waiting = TRUE here and wait
+          until the callback "targets_selection_received"
+          sets it to FALSE */
+
+        m_waiting = TRUE;
+
+        gtk_selection_convert( m_targetsWidget,
+                           m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                        : g_clipboardAtom,
+                           g_targetsAtom,
+                           (guint32) GDK_CURRENT_TIME );
+
+        while (m_waiting) gtk_main_iteration();
+
+        if (!m_formatSupported) continue;
+
+        /* store pointer to data object to be filled up by callbacks */
+        m_receivedData = &data;
+
+        /* store requested format to be asked for by callbacks */
+        m_targetRequested = format;
+
+        wxCHECK_MSG( m_targetRequested, FALSE, wxT("invalid clipboard format") );
+
+        /* start query */
+        m_formatSupported = FALSE;
+
+        /* ask for clipboard contents.  this will set
+           m_formatSupported to TRUE if m_targetRequested
+           is supported.
+           also, we have to wait for the "answer" from the
+           clipboard owner which is an asynchronous process.
+           therefore we set m_waiting = TRUE here and wait
+           until the callback "targets_selection_received"
+           sets it to FALSE */
+
+        m_waiting = TRUE;
+
+        wxLogDebug( wxT("wxClipboard::GetData: format found, start convert") );
+
+        gtk_selection_convert( m_clipboardWidget,
+                               m_usePrimary ? (GdkAtom)GDK_SELECTION_PRIMARY
+                                            : g_clipboardAtom,
+                               m_targetRequested,
+                               (guint32) GDK_CURRENT_TIME );
+
+        while (m_waiting) gtk_main_iteration();
+
+        /* this is a true error as we checked for the presence of such data before */
+        wxCHECK_MSG( m_formatSupported, FALSE, wxT("error retrieving data from clipboard") );
+
+        /* return success */
+        delete[] array;
+        return TRUE;
+    }
+
+    wxLogDebug( wxT("wxClipboard::GetData: format not found") );
+
+    /* return failure */
+    delete[] array;
+    return FALSE;
+}
+
+#endif
+  // wxUSE_CLIPBOARD
+