vmap/libs/gtkutil/clipboard.cpp

/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "clipboard.h"

#include "globaldefs.h"
#include "stream/memstream.h"
#include "stream/textstream.h"


/// \file
/// \brief Platform-independent GTK clipboard support.
/// \todo Using GDK_SELECTION_CLIPBOARD fails on win32, so we use the win32 API directly for now.
#if GDEF_OS_WINDOWS

const char* c_clipboard_format = "RadiantClippings";

#include <windows.h>

void clipboard_copy( ClipboardCopyFunc copy ){
	BufferOutputStream ostream;
	copy( ostream );

	bool bClipped = false;
	UINT nClipboard = ::RegisterClipboardFormat( c_clipboard_format );
	if ( nClipboard > 0 ) {
		if ( ::OpenClipboard( 0 ) ) {
			EmptyClipboard();
			std::size_t length = ostream.size();
			HANDLE h = ::GlobalAlloc( GMEM_ZEROINIT | GMEM_MOVEABLE | GMEM_DDESHARE, length + sizeof( std::size_t ) );
			if ( h != 0 ) {
				char *buffer = reinterpret_cast<char*>( ::GlobalLock( h ) );
				*reinterpret_cast<std::size_t*>( buffer ) = length;
				buffer += sizeof( std::size_t );
				memcpy( buffer, ostream.data(), length );
				::GlobalUnlock( h );
				::SetClipboardData( nClipboard, h );
				::CloseClipboard();
				bClipped = true;
			}
		}
	}

	if ( !bClipped ) {
		globalOutputStream() << "Unable to register Windows clipboard formats, copy/paste between editors will not be possible\n";
	}
}

void clipboard_paste( ClipboardPasteFunc paste ){
	UINT nClipboard = ::RegisterClipboardFormat( c_clipboard_format );
	if ( nClipboard > 0 && ::OpenClipboard( 0 ) ) {
		if ( IsClipboardFormatAvailable( nClipboard ) ) {
			HANDLE h = ::GetClipboardData( nClipboard );
			if ( h ) {
				const char *buffer = reinterpret_cast<const char*>( ::GlobalLock( h ) );
				std::size_t length = *reinterpret_cast<const std::size_t*>( buffer );
				buffer += sizeof( std::size_t );
				BufferInputStream istream( buffer, length );
				paste( istream );
				::GlobalUnlock( h );
			}
		}
		::CloseClipboard();
	}
}

#else

#include <gtk/gtk.h>

enum {
	RADIANT_CLIPPINGS = 23,
};

static char RADIANT_CLIPPINGS_STR[] = "RADIANT_CLIPPINGS";

static const GtkTargetEntry clipboard_targets[] = {
	{RADIANT_CLIPPINGS_STR, 0, RADIANT_CLIPPINGS,},
};

static void clipboard_get(GtkClipboard *clipboard, GtkSelectionData *selection_data, guint info, gpointer data)
{
	std::size_t len = *reinterpret_cast<std::size_t *>( data );
	const char *buffer = (len != 0) ? reinterpret_cast<const char *>( data ) + sizeof(std::size_t) : 0;

	GdkAtom type = GDK_NONE;
	if (info == clipboard_targets[0].info) {
		type = gdk_atom_intern(clipboard_targets[0].target, FALSE);
	}

	gtk_selection_data_set(selection_data, type, 8, reinterpret_cast<const guchar *>( buffer ),
	                       static_cast<gint>( len ));
}

static void clipboard_clear(GtkClipboard *clipboard, gpointer data)
{
	delete[] reinterpret_cast<const char *>( data );
}

static void clipboard_received(GtkClipboard *clipboard, GtkSelectionData *data, gpointer user_data)
{
	if (gtk_selection_data_get_length(data) < 0) {
		globalErrorStream() << "Error retrieving selection\n";
	} else if (strcmp(gdk_atom_name(gtk_selection_data_get_data_type(data)), clipboard_targets[0].target) == 0) {
		BufferInputStream istream(reinterpret_cast<const char *>( gtk_selection_data_get_data(data)),
		                          gtk_selection_data_get_length(data));
		(*reinterpret_cast<ClipboardPasteFunc *>( user_data ))(istream);
	}
}

void clipboard_copy(ClipboardCopyFunc copy)
{
	GtkClipboard *clipboard = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);

	BufferOutputStream ostream;
	copy(ostream);
	std::size_t length = ostream.size();
	char *data = new char[length + sizeof(std::size_t)];
	*reinterpret_cast<std::size_t *>( data ) = length;
	memcpy(data + sizeof(std::size_t), ostream.data(), length);

	gtk_clipboard_set_with_data(clipboard, clipboard_targets, 1, clipboard_get, clipboard_clear, data);
}

ClipboardPasteFunc g_clipboardPasteFunc = 0;

void clipboard_paste(ClipboardPasteFunc paste)
{
	GtkClipboard *clipboard = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);

	g_clipboardPasteFunc = paste;
	gtk_clipboard_request_contents(clipboard, gdk_atom_intern(clipboard_targets[0].target, FALSE), clipboard_received,
	                               &g_clipboardPasteFunc);
}


#endif