//-------------------------------------------------------------------------
// Filename:      dnd.cc
// Version:       $Id: dnd.cc,v 1.1.4.2 1999/05/24 22:54:49 erik Exp $
// Copyright:     Copyright (C) 1999, Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
// Author:        Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
// Description:   GUI drag-n-drop functions
// Created at:    Sun May  2 16:33:19 1999
// Modified by:   Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
// Modified at:   Mon May 24 14:16:06 1999
//-------------------------------------------------------------------------
// 
// This program 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.
// 
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

#ident "$Id: dnd.cc,v 1.1.4.2 1999/05/24 22:54:49 erik Exp $"

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef MUSICA_DEBUG
# include <iostream.h>
#endif

#include <stdio.h>

#ifdef STDC_HEADERS
# include <stdlib.h>
# include <string.h>
#endif

#include <gtk/gtk.h>

#include "gui.hh"
#include "dnd.hh"

#ifndef HAVE_STRSTR
 extern "C" char *strstr(const char *haystack, const char *needle);
#endif
#ifndef HAVE_STRDUP
 extern "C" char *strdup(const char *s);
#endif








static void makeDropStyles(void);








GtkWidget *dropEventbox = 0;
GtkWidget *dropFrame = 0;
static bool have_drag = false;
static GtkStyle *eventBoxDefaultStyle = 0;
static GtkStyle *eventBoxDropStyle = 0;
static GtkStyle *frameDefaultStyle = 0;
static GtkStyle *frameDropStyle = 0;







gboolean dndMotionCallback(GtkWidget *widget, GdkDragContext *context,
			   int x, int y,
			   guint time)
{
  if(have_drag == false)
    {
#ifdef MUSICA_DEBUG
      cerr<< __PRETTY_FUNCTION__<< ": drop pocket: enter"<< endl;
#endif

      if(eventBoxDropStyle == 0)
	makeDropStyles();

      gtk_widget_set_style(dropFrame, eventBoxDropStyle);
      gtk_widget_set_style(dropEventbox, frameDropStyle);
      have_drag = true;
    }

  gdk_drag_status(context, context->suggested_action, time);
  return TRUE;
}








void dndLeaveCallback(GtkWidget *widget, GdkDragContext *context, 
		      guint time)
{
#ifdef MUSICA_DEBUG
  cerr<< __PRETTY_FUNCTION__<< ": drop pocket: leave"<< endl;
#endif

  if(eventBoxDefaultStyle == 0)
    makeDropStyles();

  gtk_widget_set_style(dropEventbox, eventBoxDefaultStyle);
  gtk_widget_set_style(dropFrame, frameDefaultStyle);

  have_drag = false;
}








gboolean dndDropCallback(GtkWidget *widget, GdkDragContext *context,
			 gint x, gint y, guint time)
{
#ifdef MUSICA_DEBUG
  cerr<< __PRETTY_FUNCTION__<< ": drop pocket: drop!"<< endl;
#endif

  if(context->targets)
    {
      gtk_drag_get_data (widget, context, 
                         GPOINTER_TO_INT (context->targets->data), 
                         time);
      return(TRUE);
    }
  else
    {
      return(FALSE);
    }
}








void dndDataReceivedCallback(GtkWidget *widget,
			     GdkDragContext *context,
			     gint x, gint y,
			     GtkSelectionData *data,
			     guint info,
			     guint time)
{
  char *filename;
  char *tmp;
  
#ifdef MUSICA_DEBUG
  cerr<< __PRETTY_FUNCTION__<< ": drop pocket: ";
#endif

  if ((data->length >= 0) && (data->format == 8))
    {
#ifdef MUSICA_DEBUG
      cerr<< "received "<< (char *)data->data<< endl;
#endif

      // strip the "file:" part that the GNOME Midnight Commander gives us
      filename = strdup(strstr((char *)data->data, "/"));

      if(filename != 0)
	{
	  // strip \r and \n
	  tmp = strstr(filename, "\r");
	  if(tmp != 0)
	    *tmp = '\0';

	  tmp = strstr(filename, "\n");
	  if(tmp != 0)
	    *tmp = '\0';
	  
	  openFile(filename);

	  free(filename);
	}
      
      gtk_drag_finish(context, TRUE, FALSE, time);
    }
  else
    {
#ifdef MUSICA_DEBUG
      cerr<< "unable to handle data"<< endl;
#endif
      gtk_drag_finish(context, FALSE, FALSE, time);
    }
}








static void makeDropStyles(void)
{
  GdkColor color = { 0,0,0,0 };
  int i;

  if(eventBoxDefaultStyle == 0)
    {
#ifdef MUSICA_DEBUG
      cerr<< __PRETTY_FUNCTION__<< endl;
#endif
      // get the default widget style for the event box so its
      // background is no longer transparent
      eventBoxDefaultStyle = gtk_widget_get_default_style();
      eventBoxDropStyle = gtk_style_copy(eventBoxDefaultStyle);
        
      // get the default style of the widget because only the
      // background color has to be changed
      frameDefaultStyle = gtk_widget_get_style(dropFrame);
      frameDropStyle = gtk_style_copy(frameDefaultStyle);
      
      color.red   = 0x4100;
      color.green = 0x6900;
      color.blue  = 0xe100;

      for(i = 0; i < 5; i++)
	{
 	  eventBoxDropStyle->bg[i] = color;
 	  frameDropStyle->bg[i] = color;
	}
    }
}