/*
 * ext-closepath.js
 *
 * Licensed under the Apache License, Version 2
 *
 * Copyright(c) 2010 Jeff Schiller
 *
 */

// This extension adds a simple button to the contextual panel for paths
// The button toggles whether the path is open or closed
methodDraw.addExtension("ClosePath", function(S) {
    var selElems,
      updateButton = function(path) {
        var seglist = path.pathSegList,
          closed = seglist.getItem(seglist.numberOfItems - 1).pathSegType==1,
          showbutton = closed ? '#tool_openpath' : '#tool_closepath',
          hidebutton = closed ? '#tool_closepath' : '#tool_openpath';
          $(hidebutton).hide();
          $(showbutton).show();
      },
      showPanel = function(on) {
        $('#closepath_panel').toggle(on);
        if (on) {
          var path = selElems[0];
          if (path) updateButton(path);
        }
      },
    
      toggleClosed = function() {
        var path = selElems[0];
        if (path) {
          var seglist = path.pathSegList,
            last = seglist.numberOfItems - 1;         
          // is closed
          if(seglist.getItem(last).pathSegType == 1) {
            seglist.removeItem(last);
          }
          else {
            seglist.appendItem(path.createSVGPathSegClosePath());
          }
          updateButton(path);
        }
      };
    
    return {
      name: "ClosePath",
      svgicons: "extensions/closepath_icons.svg",
      buttons: [{
        id: "tool_openpath",
        type: "context",
        panel: "closepath_panel",
        title: "Open path",
        events: {
          'click': function() {
            toggleClosed();
          }
        }
      },
      {
        id: "tool_closepath",
        type: "context",
        panel: "closepath_panel",
        title: "Close path",
        events: {
          'click': function() {
            toggleClosed();
          }
        }
      }],
      callback: function() {
        $('#closepath_panel').hide();
      },
      selectedChanged: function(opts) {
        selElems = opts.elems;
        var i = selElems.length;
        
        while(i--) {
          var elem = selElems[i];
          if(elem && elem.tagName == 'path') {
            if(opts.selectedElement && !opts.multiselected) {
              showPanel(true);
            } else {
              showPanel(false);
            }
          } else {
            showPanel(false);
          }
        }
      }
    };
});
