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Edit File: metric_segment.ts

import $ from 'jquery';
import { debounce, find, indexOf, map, escape, unescape } from 'lodash';

import { TemplateSrv } from 'app/features/templating/template_srv';

import coreModule from './core_module';

export function metricSegment($compile: any, $sce: any, templateSrv: TemplateSrv) {
  const inputTemplate =
    '<input type="text" data-provide="typeahead" ' +
    ' class="gf-form-input input-medium"' +
    ' spellcheck="false" style="display:none"></input>';

const linkTemplate =
    '<a class="gf-form-label" ng-class="segment.cssClass" ' +
    'tabindex="1" give-focus="segment.focus" ng-bind-html="segment.html"></a>';

const selectTemplate =
    '<a class="gf-form-input gf-form-input--dropdown" ng-class="segment.cssClass" ' +
    'tabindex="1" give-focus="segment.focus" ng-bind-html="segment.html"></a>';

return {
    scope: {
      segment: '=',
      getOptions: '&',
      onChange: '&',
      debounce: '@',
    },
    link: ($scope: any, elem: any) => {
      const $input = $(inputTemplate);
      const segment = $scope.segment;
      const $button = $(segment.selectMode ? selectTemplate : linkTemplate);
      let options = null;
      let cancelBlur: any = null;
      let linkMode = true;
      const debounceLookup = $scope.debounce;

$input.appendTo(elem);
      $button.appendTo(elem);

$scope.updateVariableValue = (value: string) => {
        if (value === '' || segment.value === value) {
          return;
        }

$scope.$apply(() => {
          const selected: any = find($scope.altSegments, { value: value });
          if (selected) {
            segment.value = selected.value;
            segment.html = selected.html || $sce.trustAsHtml(templateSrv.highlightVariablesAsHtml(selected.value));
            segment.fake = false;
            segment.expandable = selected.expandable;

if (selected.type) {
              segment.type = selected.type;
            }
          } else if (segment.custom !== 'false') {
            segment.value = value;
            segment.html = $sce.trustAsHtml(templateSrv.highlightVariablesAsHtml(value));
            segment.expandable = true;
            segment.fake = false;
          }

$scope.onChange();
        });
      };

$scope.switchToLink = (fromClick: boolean) => {
        if (linkMode && !fromClick) {
          return;
        }

clearTimeout(cancelBlur);
        cancelBlur = null;
        linkMode = true;
        $input.hide();
        $button.show();
        $scope.updateVariableValue($input.val());
      };

$scope.inputBlur = () => {
        // happens long before the click event on the typeahead options
        // need to have long delay because the blur
        cancelBlur = setTimeout($scope.switchToLink, 200);
      };

$scope.source = (query: string, callback: any) => {
        $scope.$apply(() => {
          $scope.getOptions({ $query: query }).then((altSegments: any) => {
            $scope.altSegments = altSegments;
            options = map($scope.altSegments, (alt) => {
              return escape(alt.value);
            });

// add custom values
            if (segment.custom !== 'false') {
              if (!segment.fake && indexOf(options, segment.value) === -1) {
                options.unshift(escape(segment.value));
              }
            }

callback(options);
          });
        });
      };

$scope.updater = (value: string) => {
        value = unescape(value);
        if (value === segment.value) {
          clearTimeout(cancelBlur);
          $input.focus();
          return value;
        }

$input.val(value);
        $scope.switchToLink(true);

return value;
      };

$scope.matcher = function (item: string) {
        if (linkMode) {
          return false;
        }
        let str = this.query;
        if (str[0] === '/') {
          str = str.substring(1);
        }
        if (str[str.length - 1] === '/') {
          str = str.substring(0, str.length - 1);
        }
        try {
          return item.toLowerCase().match(str.toLowerCase());
        } catch (e) {
          return false;
        }
      };

$input.attr('data-provide', 'typeahead');
      $input.typeahead({
        source: $scope.source,
        minLength: 0,
        items: 10000,
        updater: $scope.updater,
        matcher: $scope.matcher,
      });

const typeahead = $input.data('typeahead');
      typeahead.lookup = function () {
        this.query = this.$element.val() || '';
        const items = this.source(this.query, $.proxy(this.process, this));
        return items ? this.process(items) : items;
      };

if (debounceLookup) {
        typeahead.lookup = debounce(typeahead.lookup, 500, { leading: true });
      }

$button.keydown((evt) => {
        // trigger typeahead on down arrow or enter key
        if (evt.keyCode === 40 || evt.keyCode === 13) {
          $button.click();
        }
      });

$button.click(() => {
        options = null;
        $input.css('width', Math.max($button.width()!, 80) + 16 + 'px');

$button.hide();
        $input.show();
        $input.focus();

linkMode = false;

const typeahead = $input.data('typeahead');
        if (typeahead) {
          $input.val('');
          typeahead.lookup();
        }
      });

$input.blur($scope.inputBlur);

$compile(elem.contents())($scope);
    },
  };
}

export function metricSegmentModel(uiSegmentSrv: any) {
  return {
    template:
      '<metric-segment segment="segment" get-options="getOptionsInternal()" on-change="onSegmentChange()"></metric-segment>',
    restrict: 'E',
    scope: {
      property: '=',
      options: '=',
      getOptions: '&',
      onChange: '&',
    },
    link: {
      pre: function postLink($scope: any, elem: any, attrs: any) {
        let cachedOptions: any;

$scope.valueToSegment = (value: any) => {
          const option: any = find($scope.options, { value: value });
          const segment = {
            cssClass: attrs.cssClass,
            custom: attrs.custom,
            value: option ? option.text : value,
            selectMode: attrs.selectMode,
          };

return uiSegmentSrv.newSegment(segment);
        };

$scope.getOptionsInternal = () => {
          if ($scope.options) {
            cachedOptions = $scope.options;
            return Promise.resolve(
              map($scope.options, (option) => {
                return { value: option.text };
              })
            );
          } else {
            return $scope.getOptions().then((options: any) => {
              cachedOptions = options;
              return map(options, (option) => {
                if (option.html) {
                  return option;
                }
                return { value: option.text };
              });
            });
          }
        };

$scope.onSegmentChange = () => {
          if (cachedOptions) {
            const option: any = find(cachedOptions, { text: $scope.segment.value });
            if (option && option.value !== $scope.property) {
              $scope.property = option.value;
            } else if (attrs.custom !== 'false') {
              $scope.property = $scope.segment.value;
            }
          } else {
            $scope.property = $scope.segment.value;
          }

// needs to call this after digest so
          // property is synced with outerscope
          $scope.$$postDigest(() => {
            $scope.$apply(() => {
              $scope.onChange();
            });
          });
        };

$scope.segment = $scope.valueToSegment($scope.property);
      },
    },
  };
}

coreModule.directive('metricSegment', ['$compile', '$sce', 'templateSrv', metricSegment]);
coreModule.directive('metricSegmentModel', ['uiSegmentSrv', metricSegmentModel]);