Rationalize button disabling/enabling throughout UI

[scpubgit/stemmaweb.git] / root / js / detach_helpers.js

function edges_of( ellipse ) {
  var edges = new Array();
  var node_id = ellipse.parent().attr('id');
  var edge_outgoing_pattern = new RegExp( '^' + node_id + '-' );
  var edge_incoming_pattern = new RegExp( node_id + '$' );
  $.each( $('#svgenlargement .edge'), function(index) {
      title = $(this).children('title').text();
      if( edge_outgoing_pattern.test(title) || edge_incoming_pattern.test(title) ) {
          var edge = new Edge( $(this) );
          edge.node_id = node_id;
          if( edge_incoming_pattern.test(title) ) {
              edge.is_incoming  = true;
          }
          edges.push( edge );
      }
  } );
  return edges;
}

function Edge( g_elem ) {
    
    var self = this;
    
    this.g_elem = g_elem;
    this.witnesses = g_elem.children('text').text().split( /,\s*/ );
    this.is_incoming = false;
    this.start_node_id = g_elem.children('title').text().split('-')[0];
    this.end_node_id = g_elem.children('title').text().split('>')[1];
    
    this.detach_witnesses = function( witnesses_to_detach ) {
        var detached = [];
        var left = '';
        var clone = null;
        $.each( witnesses_to_detach, function( index, witness_to_detach ) {
            witness_index = self.witnesses.indexOf( witness_to_detach );
            if( witness_index > -1 ) {  
                self.witnesses.splice( witness_index, 1 );
                detached.push( witness_to_detach );
            }
        } );
        if( detached != '' ) {
            clone = self.clone_for( detached );
        }
        var remaining = self.create_label( self.witnesses );
        if( remaining == '' ) {
            self.g_elem.remove();
        } else {
            self.g_elem.children('text').text( remaining );
        }
        return clone;
    }
    
    this.get_label = function() {
        return self.g_elem.children('text').text();
    }
    
    this.create_label = function( witnesses ) {
        var label = '';
        $.each( witnesses, function( index, witness ) {
            label = label + witness + ', ';
        } );
        label = label.replace( /, $/, '' );
        return label;
    }
    
    this.clone_for = function( witnesses ) {
        var label = self.create_label( witnesses );
        var clone = g_elem.clone();
        clone.children('text').text( label );
        var duplicate_data = g_elem.data( 'repositioned' );
        if( duplicate_data != null ) {
            clone.data( 'repositioned', duplicate_data );
        }
        clone = new Edge( clone );        
        clone.is_incoming = self.is_incoming;
        return clone;
    }
    
    this.attach_witnesses = function( witnesses ) {
        self.witnesses = self.witnesses.concat( witnesses );
        self.g_elem.children( 'text' ).text( self.create_label( self.witnesses ) );
        var edge_weight = 0.8 + ( 0.2 * self.witnesses.length );
        self.g_elem.children( 'path' ).attr( 'stroke-width', edge_weight );
    }
    
    this.attach_endpoint = function( target_node_id ) {
        // first let's find out if the startpoint might also be linked to the target already
        // in that case we need to remove this edge and transfer the witnesses to the 
        // appropriate edge of the target_node
        $.each( edges_of( get_ellipse( target_node_id ) ), function( index, target_edge ) {
            if( (self != null) && (target_edge.is_incoming == true) ) {
                if( self.start_node_id == target_edge.start_node_id) {
                    target_edge.attach_witnesses( self.witnesses );
                    self.g_elem.remove();
                    self = null;
                }
            }
        } );
        // if not let's really move the end pointer towards the target node
        if( self != null ) {
            var polygon = self.g_elem.children( 'polygon' ); 
            if( polygon.size() > 0 ) {
                var end_point_arrowhead = new svgshape( polygon );
                var path_segments = self.g_elem.children('path')[0].pathSegList;
                var edge_path = new svgpath( path_segments.getItem(path_segments.numberOfItems - 1), self.g_elem.children('path') );
                var target_ellipse = get_ellipse( target_node_id );
                var target_cx = parseFloat( target_ellipse.attr( 'cx' ) );
                var target_cy = parseFloat( target_ellipse.attr( 'cy' ) );
                var target_rx = parseFloat( target_ellipse.attr( 'rx' ) );
                var source_ellipse = get_ellipse( self.end_node_id );
                var source_cx = parseFloat( source_ellipse.attr( 'cx' ) );
                var source_cy = parseFloat( source_ellipse.attr( 'cy' ) );
                var source_rx = parseFloat( source_ellipse.attr( 'rx' ) );
                var dx = (target_cx - target_rx) - (source_cx - source_rx);
                var dy = (target_cy - source_cy);
                end_point_arrowhead.reposition( dx, dy );
                edge_path.reposition( dx, dy );
                // var new_title = g_elem.children('title').text().replace( self.end_node_id, target_node_id );
                // console.log( new_title );
            }
        }
    }

    this.attach_startpoint = function( target_node_id ) {
        // first let's find out if the endpoint might also be linked to the target already
        // in that case we need to remove this edge and transfer the witnesses to the 
        // appropriate edge of the target_node
        $.each( edges_of( get_ellipse( target_node_id ) ), function( index, target_edge ) {
            if( (self != null) && (target_edge.is_incoming != true ) ) {
                if( self.end_node_id == target_edge.end_node_id) {
                    target_edge.attach_witnesses( self.witnesses );
                    self.g_elem.remove();
                    self = null;
                }
            }
        } );
        // if not let's really move the start point towards the target node
        if( self != null ) {
            var path_segments = self.g_elem.children('path')[0].pathSegList;                
            var edge_path = new svgpath( path_segments.getItem(0), self.g_elem.children('path') );
            var target_ellipse = get_ellipse( target_node_id );
            var target_cx = parseFloat( target_ellipse.attr( 'cx' ) );
            var target_cy = parseFloat( target_ellipse.attr( 'cy' ) );
            var target_rx = parseFloat( target_ellipse.attr( 'rx' ) );
            var source_ellipse = get_ellipse( self.start_node_id );
            var source_cx = parseFloat( source_ellipse.attr( 'cx' ) );
            var source_cy = parseFloat( source_ellipse.attr( 'cy' ) );
            var source_rx = parseFloat( source_ellipse.attr( 'rx' ) );
            var dx = (target_cx + target_rx) - (source_cx + source_rx);
            var dy = (target_cy - source_cy);
            edge_path.reposition( dx, dy );
        }
    }
    
}