keydown: function()

in site/semantic/src/definitions/modules/dropdown.js [1163:1273]
107 lines of code
32 McCabe index (conditional complexity)

            keydown: function(event) {
              var
                pressedKey    = event.which,
                isShortcutKey = module.is.inObject(pressedKey, keys)
              ;
              if(isShortcutKey) {
                var
                  $label            = $module.find(selector.label),
                  $activeLabel      = $label.filter('.' + className.active),
                  activeValue       = $activeLabel.data(metadata.value),
                  labelIndex        = $label.index($activeLabel),
                  labelCount        = $label.length,
                  hasActiveLabel    = ($activeLabel.length > 0),
                  hasMultipleActive = ($activeLabel.length > 1),
                  isFirstLabel      = (labelIndex === 0),
                  isLastLabel       = (labelIndex + 1 == labelCount),
                  isSearch          = module.is.searchSelection(),
                  isFocusedOnSearch = module.is.focusedOnSearch(),
                  isFocused         = module.is.focused(),
                  caretAtStart      = (isFocusedOnSearch && module.get.caretPosition() === 0),
                  $nextLabel
                ;
                if(isSearch && !hasActiveLabel && !isFocusedOnSearch) {
                  return;
                }

                if(pressedKey == keys.leftArrow) {
                  // activate previous label
                  if((isFocused || caretAtStart) && !hasActiveLabel) {
                    module.verbose('Selecting previous label');
                    $label.last().addClass(className.active);
                  }
                  else if(hasActiveLabel) {
                    if(!event.shiftKey) {
                      module.verbose('Selecting previous label');
                      $label.removeClass(className.active);
                    }
                    else {
                      module.verbose('Adding previous label to selection');
                    }
                    if(isFirstLabel && !hasMultipleActive) {
                      $activeLabel.addClass(className.active);
                    }
                    else {
                      $activeLabel.prev(selector.siblingLabel)
                        .addClass(className.active)
                        .end()
                      ;
                    }
                    event.preventDefault();
                  }
                }
                else if(pressedKey == keys.rightArrow) {
                  // activate first label
                  if(isFocused && !hasActiveLabel) {
                    $label.first().addClass(className.active);
                  }
                  // activate next label
                  if(hasActiveLabel) {
                    if(!event.shiftKey) {
                      module.verbose('Selecting next label');
                      $label.removeClass(className.active);
                    }
                    else {
                      module.verbose('Adding next label to selection');
                    }
                    if(isLastLabel) {
                      if(isSearch) {
                        if(!isFocusedOnSearch) {
                          module.focusSearch();
                        }
                        else {
                          $label.removeClass(className.active);
                        }
                      }
                      else if(hasMultipleActive) {
                        $activeLabel.next(selector.siblingLabel).addClass(className.active);
                      }
                      else {
                        $activeLabel.addClass(className.active);
                      }
                    }
                    else {
                      $activeLabel.next(selector.siblingLabel).addClass(className.active);
                    }
                    event.preventDefault();
                  }
                }
                else if(pressedKey == keys.deleteKey || pressedKey == keys.backspace) {
                  if(hasActiveLabel) {
                    module.verbose('Removing active labels');
                    if(isLastLabel) {
                      if(isSearch && !isFocusedOnSearch) {
                        module.focusSearch();
                      }
                    }
                    $activeLabel.last().next(selector.siblingLabel).addClass(className.active);
                    module.remove.activeLabels($activeLabel);
                    event.preventDefault();
                  }
                  else if(caretAtStart && !hasActiveLabel && pressedKey == keys.backspace) {
                    module.verbose('Removing last label on input backspace');
                    $activeLabel = $label.last().addClass(className.active);
                    module.remove.activeLabels($activeLabel);
                  }
                }
                else {
                  $activeLabel.removeClass(className.active);
                }
              }
            }