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?? Editing: summernote-ext-specialchars.js

var $editor = context.layoutInfo.editor;
      var options = context.options;
      var lang = options.langInfo;

var KEY = {
        UP: 38,
        DOWN: 40,
        LEFT: 37,
        RIGHT: 39,
        ENTER: 13
      };
      var COLUMN_LENGTH = 15;
      var COLUMN_WIDTH = 35;

var currentColumn, currentRow, totalColumn, totalRow = 0;

// special characters data set
      var specialCharDataSet = [
        '&quot;', '&amp;', '&lt;', '&gt;', '&iexcl;', '&cent;',
        '&pound;', '&curren;', '&yen;', '&brvbar;', '&sect;',
        '&uml;', '&copy;', '&ordf;', '&laquo;', '&not;',
        '&reg;', '&macr;', '&deg;', '&plusmn;', '&sup2;',
        '&sup3;', '&acute;', '&micro;', '&para;', '&middot;',
        '&cedil;', '&sup1;', '&ordm;', '&raquo;', '&frac14;',
        '&frac12;', '&frac34;', '&iquest;', '&times;', '&divide;',
        '&fnof;', '&circ;', '&tilde;', '&ndash;', '&mdash;',
        '&lsquo;', '&rsquo;', '&sbquo;', '&ldquo;', '&rdquo;',
        '&bdquo;', '&dagger;', '&Dagger;', '&bull;', '&hellip;',
        '&permil;', '&prime;', '&Prime;', '&lsaquo;', '&rsaquo;',
        '&oline;', '&frasl;', '&euro;', '&image;', '&weierp;',
        '&real;', '&trade;', '&alefsym;', '&larr;', '&uarr;',
        '&rarr;', '&darr;', '&harr;', '&crarr;', '&lArr;',
        '&uArr;', '&rArr;', '&dArr;', '&hArr;', '&forall;',
        '&part;', '&exist;', '&empty;', '&nabla;', '&isin;',
        '&notin;', '&ni;', '&prod;', '&sum;', '&minus;',
        '&lowast;', '&radic;', '&prop;', '&infin;', '&ang;',
        '&and;', '&or;', '&cap;', '&cup;', '&int;',
        '&there4;', '&sim;', '&cong;', '&asymp;', '&ne;',
        '&equiv;', '&le;', '&ge;', '&sub;', '&sup;',
        '&nsub;', '&sube;', '&supe;', '&oplus;', '&otimes;',
        '&perp;', '&sdot;', '&lceil;', '&rceil;', '&lfloor;',
        '&rfloor;', '&loz;', '&spades;', '&clubs;', '&hearts;',
        '&diams;'
      ];

context.memo('button.specialCharacter', function () {
        return ui.button({
          contents: '<i class="fa fa-font fa-flip-vertical">',
          tooltip: lang.specialChar.specialChar,
          click: function () {
            self.show();
          }
        }).render();
      });

/**
       * Make Special Characters Table
       *
       * @member plugin.specialChar
       * @private
       * @return {jQuery}
       */
      this.makeSpecialCharSetTable = function () {
        var $table = $('<table/>');
        $.each(specialCharDataSet, function (idx, text) {
          var $td = $('<td/>').addClass('note-specialchar-node');
          var $tr = (idx % COLUMN_LENGTH === 0) ? $('<tr/>') : $table.find('tr').last();

$td.append($button);

$tr.append($td);
          if (idx % COLUMN_LENGTH === 0) {
            $table.append($tr);
          }
        });

totalRow = $table.find('tr').length;
        totalColumn = COLUMN_LENGTH;

return $table;
      };

this.initialize = function () {
        var $container = options.dialogsInBody ? $(document.body) : $editor;

var body = '<div class="form-group row-fluid">' + this.makeSpecialCharSetTable()[0].outerHTML + '</div>';

this.$dialog = ui.dialog({
          title: lang.specialChar.select,
          body: body
        }).render().appendTo($container);
      };

this.show = function () {
        var text = context.invoke('editor.getSelectedText');
        context.invoke('editor.saveRange');
        this.showSpecialCharDialog(text).then(function (selectChar) {
          context.invoke('editor.restoreRange');

// build node
          var $node = $('<span></span>').html(selectChar)[0];

if ($node) {
            // insert video node
            context.invoke('editor.insertNode', $node);
          }
        }).fail(function () {
          context.invoke('editor.restoreRange');
        });
      };

/**
       * show image dialog
       *
       * @param {jQuery} $dialog
       * @return {Promise}
       */
      this.showSpecialCharDialog = function (text) {
        return $.Deferred(function (deferred) {
          var $specialCharDialog = self.$dialog;
          var $specialCharNode = $specialCharDialog.find('.note-specialchar-node');
          var $selectedNode = null;
          var ARROW_KEYS = [KEY.UP, KEY.DOWN, KEY.LEFT, KEY.RIGHT];
          var ENTER_KEY = KEY.ENTER;

function addActiveClass($target) {
            if (!$target) {
              return;
            }
            $target.find('button').addClass('active');
            $selectedNode = $target;
          }

function removeActiveClass($target) {
            $target.find('button').removeClass('active');
            $selectedNode = null;
          }

// find next node
          function findNextNode(row, column) {
            var findNode = null;
            $.each($specialCharNode, function (idx, $node) {
              var findRow = Math.ceil((idx + 1) / COLUMN_LENGTH);
              var findColumn = ((idx + 1) % COLUMN_LENGTH === 0) ? COLUMN_LENGTH : (idx + 1) % COLUMN_LENGTH;
              if (findRow === row && findColumn === column) {
                findNode = $node;
                return false;
              }
            });
            return $(findNode);
          }

function arrowKeyHandler(keyCode) {
            // left, right, up, down key
            var $nextNode;
            var lastRowColumnLength = $specialCharNode.length % totalColumn;

if (KEY.LEFT === keyCode) {

if (currentColumn > 1) {
                currentColumn = currentColumn - 1;
              } else if (currentRow === 1 && currentColumn === 1) {
                currentColumn = lastRowColumnLength;
                currentRow = totalRow;
              } else {
                currentColumn = totalColumn;
                currentRow = currentRow - 1;
              }

} else if (KEY.RIGHT === keyCode) {

if (currentRow === totalRow && lastRowColumnLength === currentColumn) {
                currentColumn = 1;
                currentRow = 1;
              } else if (currentColumn < totalColumn) {
                currentColumn = currentColumn + 1;
              } else {
                currentColumn = 1;
                currentRow = currentRow + 1;
              }

} else if (KEY.UP === keyCode) {
              if (currentRow === 1 && lastRowColumnLength < currentColumn) {
                currentRow = totalRow - 1;
              } else {
                currentRow = currentRow - 1;
              }
            } else if (KEY.DOWN === keyCode) {
              currentRow = currentRow + 1;
            }

if (currentRow === totalRow && currentColumn > lastRowColumnLength) {
              currentRow = 1;
            } else if (currentRow > totalRow) {
              currentRow = 1;
            } else if (currentRow < 1) {
              currentRow = totalRow;
            }

$nextNode = findNextNode(currentRow, currentColumn);

if ($nextNode) {
              removeActiveClass($selectedNode);
              addActiveClass($nextNode);
            }
          }

function enterKeyHandler() {
            if (!$selectedNode) {
              return;
            }

deferred.resolve(decodeURIComponent($selectedNode.find('button').attr('data-value')));
            $specialCharDialog.modal('hide');
          }

// remove class
          removeActiveClass($specialCharNode);

// find selected node
          if (text) {
            for (var i = 0; i < $specialCharNode.length; i++) {
              var $checkNode = $($specialCharNode[i]);
              if ($checkNode.text() === text) {
                addActiveClass($checkNode);
                currentRow = Math.ceil((i + 1) / COLUMN_LENGTH);
                currentColumn = (i + 1) % COLUMN_LENGTH;
              }
            }
          }

ui.onDialogShown(self.$dialog, function () {

$(document).on('keydown', keyDownEventHandler);

self.$dialog.find('button').tooltip();

$specialCharNode.on('click', function (event) {
              event.preventDefault();
              deferred.resolve(decodeURIComponent($(event.currentTarget).find('button').attr('data-value')));
              ui.hideDialog(self.$dialog);
            });

});

ui.onDialogHidden(self.$dialog, function () {
            $specialCharNode.off('click');

self.$dialog.find('button').tooltip('destroy');

$(document).off('keydown', keyDownEventHandler);

if (deferred.state() === 'pending') {
              deferred.reject();
            }
          });

ui.showDialog(self.$dialog);
        });
      };
    }
  });
}));

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?? Editing: summernote-ext-specialchars.js

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