A little clarification

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

diff --git a/src/gtk/dataobj.cpp b/src/gtk/dataobj.cpp
index 353633fc7c3982b2628daa1de2d80ab4240fc204..84b89dbef67dc7f02fe9bd85d98c6fb2b379df99 100644 (file)
--- a/src/gtk/dataobj.cpp
+++ b/src/gtk/dataobj.cpp
@@ -4,66 +4,389 @@
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling

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

 ///////////////////////////////////////////////////////////////////////////////
 
 ///////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "dataobj.h"
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+    #pragma implementation "dataobj.h"

 #endif
 
 #endif
 

+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+

 #include "wx/dataobj.h"
 #include "wx/app.h"
 #include "wx/dataobj.h"
 #include "wx/app.h"

+#include "wx/debug.h"
+#include "wx/mstream.h"
+#include "wx/image.h"
+#include "wx/log.h"
+
+#include <gdk/gdk.h>
+
+//-------------------------------------------------------------------------
+// global data
+//-------------------------------------------------------------------------
+
+GdkAtom  g_textAtom        = 0;
+GdkAtom  g_pngAtom         = 0;
+GdkAtom  g_fileAtom        = 0;
+
+//-------------------------------------------------------------------------
+// wxDataFormat
+//-------------------------------------------------------------------------
+
+wxDataFormat::wxDataFormat()
+{
+    // do *not* call PrepareFormats() from here for 2 reasons:
+    //
+    // 1. we will have time to do it later because some other Set function
+    //    must be called before we really need them
+    //
+    // 2. doing so prevents us from declaring global wxDataFormats because
+    //    calling PrepareFormats (and thus gdk_atom_intern) before GDK is
+    //    initialised will result in a crash
+    m_type = wxDF_INVALID;
+    m_format = (GdkAtom) 0;
+}
+
+wxDataFormat::wxDataFormat( wxDataFormatId type )
+{
+    PrepareFormats();
+    SetType( type );
+}
+
+wxDataFormat::wxDataFormat( const wxChar *id )
+{
+    PrepareFormats();
+    SetId( id );
+}
+
+wxDataFormat::wxDataFormat( const wxString &id )
+{
+    PrepareFormats();
+    SetId( id );
+}
+
+wxDataFormat::wxDataFormat( NativeFormat format )
+{
+    PrepareFormats();
+    SetId( format );
+}
+
+void wxDataFormat::SetType( wxDataFormatId type )
+{
+    PrepareFormats();
+    
+    if (type == wxDF_UNICODETEXT)
+       type = wxDF_TEXT;
+
+    m_type = type;
+    
+    if (m_type == wxDF_TEXT)
+        m_format = g_textAtom;
+    else
+    if (m_type == wxDF_BITMAP)
+        m_format = g_pngAtom;
+    else
+    if (m_type == wxDF_FILENAME)
+        m_format = g_fileAtom;
+    else
+    {
+       wxFAIL_MSG( wxT("invalid dataformat") );
+    }
+}
+
+wxDataFormatId wxDataFormat::GetType() const
+{
+    return m_type;
+}
+
+wxString wxDataFormat::GetId() const
+{
+    wxString ret = wxString::FromAscii( gdk_atom_name( m_format ) );
+    return ret;
+}
+
+void wxDataFormat::SetId( NativeFormat format )
+{
+    PrepareFormats();
+    m_format = format;
+
+    if (m_format == g_textAtom)
+        m_type = wxDF_TEXT;
+    else
+    if (m_format == g_pngAtom)
+        m_type = wxDF_BITMAP;
+    else
+    if (m_format == g_fileAtom)
+        m_type = wxDF_FILENAME;
+    else
+        m_type = wxDF_PRIVATE;
+}
+
+void wxDataFormat::SetId( const wxChar *id )
+{
+    PrepareFormats();
+    m_type = wxDF_PRIVATE;
+    wxString tmp( id );
+    m_format = gdk_atom_intern( (const char*) tmp.ToAscii(), FALSE ); 
+}
+
+void wxDataFormat::PrepareFormats()
+{
+    // VZ: GNOME included in RedHat 6.1 uses the MIME types below and not the
+    //     atoms STRING and file:ALL as the old code was, but normal X apps
+    //     use STRING for text selection when transfering the data via
+    //     clipboard, for example, so do use STRING for now (GNOME apps will
+    //     probably support STRING as well for compatibility anyhow), but use
+    //     text/uri-list for file dnd because compatibility is not important
+    //     here (with whom?)
+    if (!g_textAtom)
+#if wxUSE_UNICODE
+        g_textAtom = gdk_atom_intern( "UTF8_STRING", FALSE );
+#else
+        g_textAtom = gdk_atom_intern( "STRING" /* "text/plain" */, FALSE );
+#endif
+    if (!g_pngAtom)
+        g_pngAtom = gdk_atom_intern( "image/png", FALSE );
+    if (!g_fileAtom)
+        g_fileAtom = gdk_atom_intern( "text/uri-list", FALSE );
+}

 
 //-------------------------------------------------------------------------
 // wxDataObject
 //-------------------------------------------------------------------------
 
 
 //-------------------------------------------------------------------------
 // wxDataObject
 //-------------------------------------------------------------------------
 

-IMPLEMENT_ABSTRACT_CLASS( wxDataObject, wxObject )
+wxDataObject::wxDataObject()
+{
+}

 
 

-// ----------------------------------------------------------------------------
-// wxTextDataObject
-// ----------------------------------------------------------------------------
+wxDataObject::~wxDataObject()
+{
+    // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
+}
+
+bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
+{
+    size_t nFormatCount = GetFormatCount(dir);
+    if ( nFormatCount == 1 ) 
+    {
+        return format == GetPreferredFormat();
+    }
+    else 
+    {
+        wxDataFormat *formats = new wxDataFormat[nFormatCount];
+        GetAllFormats(formats,dir);
+
+        size_t n;
+        for ( n = 0; n < nFormatCount; n++ ) 
+        {
+            if ( formats[n] == format )
+                break;
+        }
+
+        delete [] formats;

 
 

-IMPLEMENT_DYNAMIC_CLASS( wxTextDataObject, wxDataObject )
+        // found?
+        return n < nFormatCount;
+    }
+}

 
 // ----------------------------------------------------------------------------
 // wxFileDataObject
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // wxFileDataObject
 // ----------------------------------------------------------------------------
 

-IMPLEMENT_DYNAMIC_CLASS( wxFileDataObject, wxDataObject )
+bool wxFileDataObject::GetDataHere(void *buf) const
+{
+    wxString filenames;
+
+    for (size_t i = 0; i < m_filenames.GetCount(); i++)
+    {
+        filenames += wxT("file:");
+        filenames += m_filenames[i];
+        filenames += wxT("\r\n");
+    }
+
+    memcpy( buf, filenames.mbc_str(), filenames.Len() + 1 );
+
+    return TRUE;
+}
+
+size_t wxFileDataObject::GetDataSize() const
+{
+    size_t res = 0;
+
+    for (size_t i = 0; i < m_filenames.GetCount(); i++)
+    {
+        // This is junk in UTF-8
+        res += m_filenames[i].Len();
+        res += 5 + 2; // "file:" (5) + "\r\n" (2)
+    }
+
+    return res + 1;
+}
+
+bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *buf)
+{
+    // VZ: old format
+#if 0
+    // filenames are stores as a string with #0 as deliminators
+    const char *filenames = (const char*) buf;
+    size_t pos = 0;
+    for(;;)
+    {
+        if (filenames[0] == 0)
+            break;
+        if (pos >= size)
+            break;
+        wxString file( filenames );  // this returns the first file
+        AddFile( file );
+        pos += file.Len()+1;
+        filenames += file.Len()+1;
+    }
+#else // 1
+    m_filenames.Empty();
+
+    // the text/uri-list format is a sequence of URIs (filenames prefixed by
+    // "file:" as far as I see) delimited by "\r\n" of total length size
+    // (I wonder what happens if the file has '\n' in its filename??)
+    wxString filename;
+    for ( const char *p = (const char *)buf; ; p++ )
+    {
+        // some broken programs (testdnd GTK+ sample!) omit the trailing
+        // "\r\n", so check for '\0' explicitly here instead of doing it in
+        // the loop statement to account for it
+        if ( (*p == '\r' && *(p+1) == '\n') || !*p )
+        {
+            size_t lenPrefix = 5; // strlen("file:")
+            if ( filename.Left(lenPrefix).MakeLower() == _T("file:") )
+            {
+                // sometimes the syntax is "file:filename", sometimes it's
+                // URL-like: "file://filename" - deal with both
+                if ( filename[lenPrefix] == _T('/') &&
+                     filename[lenPrefix + 1] == _T('/') )
+                {
+                    // skip the slashes
+                    lenPrefix += 2;
+                }
+
+                AddFile(filename.c_str() + lenPrefix);
+                filename.Empty();
+            }
+            else
+            {
+                wxLogDebug(_T("Unsupported URI '%s' in wxFileDataObject"),
+                           filename.c_str());
+            }
+
+            if ( !*p )
+                break;
+
+            // skip '\r'
+            p++;
+        }
+        else
+        {
+            filename += *p;
+        }
+    }
+#endif // 0/1
+
+    return TRUE;
+}
+
+void wxFileDataObject::AddFile( const wxString &filename )
+{
+   m_filenames.Add( filename );
+}

 
 // ----------------------------------------------------------------------------
 // wxBitmapDataObject
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // wxBitmapDataObject
 // ----------------------------------------------------------------------------
 

-IMPLEMENT_DYNAMIC_CLASS( wxBitmapDataObject, wxDataObject )
+wxBitmapDataObject::wxBitmapDataObject()
+{
+    Init();
+}

 
 

-// ----------------------------------------------------------------------------
-// wxPrivateDataObject
-// ----------------------------------------------------------------------------
+wxBitmapDataObject::wxBitmapDataObject( const wxBitmap& bitmap )
+                  : wxBitmapDataObjectBase(bitmap)
+{
+    Init();

 
 

-IMPLEMENT_DYNAMIC_CLASS( wxPrivateDataObject, wxDataObject )
+    DoConvertToPng();
+}

 
 

-wxPrivateDataObject::wxPrivateDataObject() 
-{ 
-    m_size = 0; 
-    m_data = (char*) NULL; 
-    m_id = wxTheApp->GetAppName();
+wxBitmapDataObject::~wxBitmapDataObject()
+{
+    Clear();

 }
 }

-    
-wxPrivateDataObject::~wxPrivateDataObject()
-{ 
-    if (m_data) delete[] m_data; 
+
+void wxBitmapDataObject::SetBitmap( const wxBitmap &bitmap )
+{
+    ClearAll();
+
+    wxBitmapDataObjectBase::SetBitmap(bitmap);
+
+    DoConvertToPng();

 }
 }

-  
-void wxPrivateDataObject::SetData( const char *data, size_t size )
+
+bool wxBitmapDataObject::GetDataHere(void *buf) const

 {
 {

-    m_size = size;
-    
-    if (m_data) delete[] m_data;
-    
-    m_data = new char[size];
+    if ( !m_pngSize )
+    {
+        wxFAIL_MSG( wxT("attempt to copy empty bitmap failed") );
+
+        return FALSE;
+    }
+
+    memcpy(buf, m_pngData, m_pngSize);
+
+    return TRUE;
+}
+
+bool wxBitmapDataObject::SetData(size_t size, const void *buf)
+{
+    Clear();

 
 

-    memcpy( m_data, data, size );  
+    wxCHECK_MSG( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
+                 FALSE, wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
+
+    m_pngSize = size;
+    m_pngData = malloc(m_pngSize);
+
+    memcpy(m_pngData, buf, m_pngSize);
+
+    wxMemoryInputStream mstream((char*) m_pngData, m_pngSize);
+    wxImage image;
+    if ( !image.LoadFile( mstream, wxBITMAP_TYPE_PNG ) )
+    {
+        return FALSE;
+    }
+
+    m_bitmap = wxBitmap(image);
+
+    return m_bitmap.Ok();
+}
+
+void wxBitmapDataObject::DoConvertToPng()
+{
+    if ( !m_bitmap.Ok() )
+        return;
+
+    wxCHECK_RET( wxImage::FindHandler(wxBITMAP_TYPE_PNG) != NULL,
+                 wxT("You must call wxImage::AddHandler(new wxPNGHandler); to be able to use clipboard with bitmaps!") );
+
+    wxImage image = m_bitmap.ConvertToImage();
+
+    wxCountingOutputStream count;
+    image.SaveFile(count, wxBITMAP_TYPE_PNG);
+
+    m_pngSize = count.GetSize() + 100; // sometimes the size seems to vary ???
+    m_pngData = malloc(m_pngSize);
+
+    wxMemoryOutputStream mstream((char*) m_pngData, m_pngSize);
+    image.SaveFile(mstream, wxBITMAP_TYPE_PNG);

 }
 
 }
 

+