svgedit/editor/extensions/ext-arrows.js

/* globals jQuery, svgEditor, svgCanvas */
/*
 * ext-arrows.js
 *
 * Licensed under the MIT License
 *
 * Copyright(c) 2010 Alexis Deveria
 *
 */

svgEditor.addExtension('Arrows', function (S) {
  const $ = jQuery;
  const // {svgcontent} = S,
    addElem = S.addSvgElementFromJson,
    {nonce} = S,
    langList = {
      'en': [
        {'id': 'arrow_none', 'textContent': 'No arrow'}
      ],
      'fr': [
        {'id': 'arrow_none', 'textContent': 'Sans flèche'}
      ]
    },
    prefix = 'se_arrow_';

  let selElems, arrowprefix, randomizeIds = S.randomize_ids;

  function setArrowNonce (window, n) {
    randomizeIds = true;
    arrowprefix = prefix + n + '_';
    pathdata.fw.id = arrowprefix + 'fw';
    pathdata.bk.id = arrowprefix + 'bk';
  }

  function unsetArrowNonce (window) {
    randomizeIds = false;
    arrowprefix = prefix;
    pathdata.fw.id = arrowprefix + 'fw';
    pathdata.bk.id = arrowprefix + 'bk';
  }

  svgCanvas.bind('setnonce', setArrowNonce);
  svgCanvas.bind('unsetnonce', unsetArrowNonce);

  if (randomizeIds) {
    arrowprefix = prefix + nonce + '_';
  } else {
    arrowprefix = prefix;
  }

  const pathdata = {
    fw: {d: 'm0,0l10,5l-10,5l5,-5l-5,-5z', refx: 8, id: arrowprefix + 'fw'},
    bk: {d: 'm10,0l-10,5l10,5l-5,-5l5,-5z', refx: 2, id: arrowprefix + 'bk'}
  };

  function getLinked (elem, attr) {
    const str = elem.getAttribute(attr);
    if (!str) { return null; }
    const m = str.match(/\(#(.*)\)/);
    if (!m || m.length !== 2) {
      return null;
    }
    return S.getElem(m[1]);
  }

  function showPanel (on) {
    $('#arrow_panel').toggle(on);
    if (on) {
      const el = selElems[0];
      const end = el.getAttribute('marker-end');
      const start = el.getAttribute('marker-start');
      const mid = el.getAttribute('marker-mid');
      let val;
      if (end && start) {
        val = 'both';
      } else if (end) {
        val = 'end';
      } else if (start) {
        val = 'start';
      } else if (mid) {
        val = 'mid';
        if (mid.includes('bk')) {
          val = 'mid_bk';
        }
      }

      if (!start && !mid && !end) {
        val = 'none';
      }

      $('#arrow_list').val(val);
    }
  }

  function resetMarker () {
    const el = selElems[0];
    el.removeAttribute('marker-start');
    el.removeAttribute('marker-mid');
    el.removeAttribute('marker-end');
  }

  function addMarker (dir, type, id) {
    // TODO: Make marker (or use?) per arrow type, since refX can be different
    id = id || arrowprefix + dir;

    const data = pathdata[dir];

    if (type === 'mid') {
      data.refx = 5;
    }

    let marker = S.getElem(id);
    if (!marker) {
      marker = addElem({
        element: 'marker',
        attr: {
          viewBox: '0 0 10 10',
          id,
          refY: 5,
          markerUnits: 'strokeWidth',
          markerWidth: 5,
          markerHeight: 5,
          orient: 'auto',
          style: 'pointer-events:none' // Currently needed for Opera
        }
      });
      const arrow = addElem({
        element: 'path',
        attr: {
          d: data.d,
          fill: '#000000'
        }
      });
      marker.appendChild(arrow);
      S.findDefs().appendChild(marker);
    }

    marker.setAttribute('refX', data.refx);

    return marker;
  }

  function setArrow () {
    resetMarker();

    let type = this.value;
    if (type === 'none') {
      return;
    }

    // Set marker on element
    let dir = 'fw';
    if (type === 'mid_bk') {
      type = 'mid';
      dir = 'bk';
    } else if (type === 'both') {
      addMarker('bk', type);
      svgCanvas.changeSelectedAttribute('marker-start', 'url(#' + pathdata.bk.id + ')');
      type = 'end';
      dir = 'fw';
    } else if (type === 'start') {
      dir = 'bk';
    }

    addMarker(dir, type);
    svgCanvas.changeSelectedAttribute('marker-' + type, 'url(#' + pathdata[dir].id + ')');
    S.call('changed', selElems);
  }

  function colorChanged (elem) {
    const color = elem.getAttribute('stroke');
    const mtypes = ['start', 'mid', 'end'];
    const defs = S.findDefs();

    $.each(mtypes, function (i, type) {
      const marker = getLinked(elem, 'marker-' + type);
      if (!marker) { return; }

      const curColor = $(marker).children().attr('fill');
      const curD = $(marker).children().attr('d');
      if (curColor === color) { return; }

      const allMarkers = $(defs).find('marker');
      let newMarker = null;
      // Different color, check if already made
      allMarkers.each(function () {
        const attrs = $(this).children().attr(['fill', 'd']);
        if (attrs.fill === color && attrs.d === curD) {
          // Found another marker with this color and this path
          newMarker = this;
        }
      });

      if (!newMarker) {
        // Create a new marker with this color
        const lastId = marker.id;
        const dir = lastId.includes('_fw') ? 'fw' : 'bk';

        newMarker = addMarker(dir, type, arrowprefix + dir + allMarkers.length);

        $(newMarker).children().attr('fill', color);
      }

      $(elem).attr('marker-' + type, 'url(#' + newMarker.id + ')');

      // Check if last marker can be removed
      let remove = true;
      $(S.svgcontent).find('line, polyline, path, polygon').each(function () {
        const elem = this;
        $.each(mtypes, function (j, mtype) {
          if ($(elem).attr('marker-' + mtype) === 'url(#' + marker.id + ')') {
            remove = false;
            return remove;
          }
        });
        if (!remove) { return false; }
      });

      // Not found, so can safely remove
      if (remove) {
        $(marker).remove();
      }
    });
  }

  return {
    name: 'Arrows',
    context_tools: [{
      type: 'select',
      panel: 'arrow_panel',
      title: 'Select arrow type',
      id: 'arrow_list',
      options: {
        none: 'No arrow',
        end: '---->',
        start: '<----',
        both: '<--->',
        mid: '-->--',
        mid_bk: '--<--'
      },
      defval: 'none',
      events: {
        change: setArrow
      }
    }],
    callback () {
      $('#arrow_panel').hide();
      // Set ID so it can be translated in locale file
      $('#arrow_list option')[0].id = 'connector_no_arrow';
    },
    addLangData (lang) {
      return {
        data: langList[lang]
      };
    },
    selectedChanged (opts) {
      // Use this to update the current selected elements
      selElems = opts.elems;

      const markerElems = ['line', 'path', 'polyline', 'polygon'];
      let i = selElems.length;
      while (i--) {
        const elem = selElems[i];
        if (elem && markerElems.includes(elem.tagName)) {
          if (opts.selectedElement && !opts.multiselected) {
            showPanel(true);
          } else {
            showPanel(false);
          }
        } else {
          showPanel(false);
        }
      }
    },
    elementChanged (opts) {
      const elem = opts.elems[0];
      if (elem && (
        elem.getAttribute('marker-start') ||
        elem.getAttribute('marker-mid') ||
        elem.getAttribute('marker-end')
      )) {
        // const start = elem.getAttribute('marker-start');
        // const mid = elem.getAttribute('marker-mid');
        // const end = elem.getAttribute('marker-end');
        // Has marker, so see if it should match color
        colorChanged(elem);
      }
    }
  };
});