From 31bb3522c895e8c1e0aabecba0af34de6d13ff7f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Piotr=20Jamr=C3=B3z?= <pm.jamroz@gmail.com>
Date: Wed, 11 Aug 2021 09:13:55 +0200
Subject: [PATCH] Graphite: Migrate to React (part 3: migrate segments)
 (#37309)

* Add UMLs

* Add rendered diagrams

* Move QueryCtrl to flux

* Remove redundant param in the reducer

* Use named imports for lodash and fix typing for GraphiteTagOperator

* Add missing async/await

* Extract providers to a separate file

* Clean up async await

* Rename controller functions back to main

* Simplify creating actions

* Re-order controller functions

* Separate helpers from actions

* Rename vars

* Simplify helpers

* Move controller methods to state reducers

* Remove docs (they are added in design doc)

* Move actions.ts to state folder

* Add docs

* Add old methods stubs for easier review

* Check how state dependencies will be mapped

* Rename state to store

* Rename state to store

* Rewrite spec tests for Graphite Query Controller

* Update docs

* Update docs

* Add GraphiteTextEditor

* Add play button

* Add AddGraphiteFunction

* Use Segment to simplify AddGraphiteFunction

* Memoize function defs

* Fix useCallback deps

* Update public/app/plugins/datasource/graphite/state/helpers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/helpers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/helpers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Update public/app/plugins/datasource/graphite/state/providers.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Add more type definitions

* Remove submitOnClickAwayOption

This behavior is actually needed to remove parameters in functions

* Load function definitions before parsing the target on initial load

* Add button padding

* Fix loading function definitions

* Change targetChanged to updateQuery to avoid mutating state directly

It's also needed for extra refresh/runQuery execution as handleTargetChanged doesn't handle changing the raw query

* Fix updating query after adding a function

* Simplify updating function params

* Migrate function editor to react

* Simplify setting Segment Select min width

* Remove unnecessary changes to SegmentInput

* Extract view logic to a helper and update types definitions

* Clean up types

* Update FuncDef types and add tests

* Show red border for unknown functions

* Autofocus on new params

* Extract params mapping to a helper

* Split code between params and function editor

* Focus on the first param when a function is added even if it's an optional argument

* Add function editor tests

* Remove todo marker

* Fix adding new functions

* Allow empty value in selects for removing function params

* Add placeholders and fix styling

* Add more docs

* Create basic implementation for metrics and tags

* Post merge fixes

These files are not .ts

* Remove mapping to Angular dropdowns

* Simplify mapping tag names, values and operators

* Simplify mapping metrics

* Fix removing tags and autocomplete

* Simplify debouncing providers

* Ensure options are loaded twice and segment is opened

* Remove focusing new segments logic (not supported by React's segment)

* Clean up

* Move debouncing to components

* Simplify mapping to selectable options

* Add docs

* use getStyles

* remove redundant async/await

* Remove

* remove redundant async/await

* Remove console.log and silent test console output

* Do not display the name of the selected dropdown option

* Use block docs for better doc generation

* Handle undefined values provided for autocomplete

Co-authored-by: Giordano Ricci <me@giordanoricci.com>
---
 .../src/components/Segment/SegmentAsync.tsx   |  9 +-
 .../src/components/Segment/SegmentSelect.tsx  | 19 +++-
 public/app/core/angular_wrappers.ts           |  2 +
 .../graphite/components/MetricSegment.tsx     | 59 ++++++++++++
 .../graphite/components/MetricsSection.tsx    | 34 +++++++
 .../graphite/components/SeriesSection.tsx     | 23 +++++
 .../graphite/components/TagEditor.tsx         | 91 +++++++++++++++++++
 .../graphite/components/TagsSection.tsx       | 75 +++++++++++++++
 .../datasource/graphite/components/helpers.ts | 15 +++
 .../datasource/graphite/graphite_query.ts     |  8 +-
 .../graphite/partials/query.editor.html       | 41 +--------
 .../plugins/datasource/graphite/query_ctrl.ts | 38 ++++----
 .../graphite/specs/query_ctrl.test.ts         | 54 ++++++-----
 .../datasource/graphite/state/actions.ts      |  2 +-
 .../datasource/graphite/state/helpers.ts      | 17 +---
 .../datasource/graphite/state/providers.ts    | 69 +++++++++-----
 .../datasource/graphite/state/store.ts        | 25 ++++-
 .../app/plugins/datasource/graphite/types.ts  |  1 -
 18 files changed, 448 insertions(+), 134 deletions(-)
 create mode 100644 public/app/plugins/datasource/graphite/components/MetricSegment.tsx
 create mode 100644 public/app/plugins/datasource/graphite/components/MetricsSection.tsx
 create mode 100644 public/app/plugins/datasource/graphite/components/SeriesSection.tsx
 create mode 100644 public/app/plugins/datasource/graphite/components/TagEditor.tsx
 create mode 100644 public/app/plugins/datasource/graphite/components/TagsSection.tsx

diff --git a/packages/grafana-ui/src/components/Segment/SegmentAsync.tsx b/packages/grafana-ui/src/components/Segment/SegmentAsync.tsx
index ffe4a60d2d8..b952c38367e 100644
--- a/packages/grafana-ui/src/components/Segment/SegmentAsync.tsx
+++ b/packages/grafana-ui/src/components/Segment/SegmentAsync.tsx
@@ -13,6 +13,11 @@ import { useStyles } from '../../themes';
 export interface SegmentAsyncProps<T> extends SegmentProps<T>, Omit<HTMLProps<HTMLDivElement>, 'value' | 'onChange'> {
   value?: T | SelectableValue<T>;
   loadOptions: (query?: string) => Promise<Array<SelectableValue<T>>>;
+  /**
+   *  If true options will be reloaded when user changes the value in the input,
+   *  otherwise, options will be loaded when the segment is clicked
+   */
+  reloadOptionsOnChange?: boolean;
   onChange: (item: SelectableValue<T>) => void;
   noOptionMessageHandler?: (state: AsyncState<Array<SelectableValue<T>>>) => string;
   inputMinWidth?: number;
@@ -22,6 +27,7 @@ export function SegmentAsync<T>({
   value,
   onChange,
   loadOptions,
+  reloadOptionsOnChange = false,
   Component,
   className,
   allowCustomValue,
@@ -45,7 +51,7 @@ export function SegmentAsync<T>({
 
     return (
       <Label
-        onClick={fetchOptions}
+        onClick={reloadOptionsOnChange ? undefined : fetchOptions}
         disabled={disabled}
         Component={
           Component || (
@@ -73,6 +79,7 @@ export function SegmentAsync<T>({
       value={value && !isObject(value) ? { value } : value}
       placeholder={inputPlaceholder}
       options={state.value ?? []}
+      loadOptions={reloadOptionsOnChange ? fetchOptions : undefined}
       width={width}
       noOptionsMessage={noOptionMessageHandler(state)}
       allowCustomValue={allowCustomValue}
diff --git a/packages/grafana-ui/src/components/Segment/SegmentSelect.tsx b/packages/grafana-ui/src/components/Segment/SegmentSelect.tsx
index 07d053ca562..a50d59b4285 100644
--- a/packages/grafana-ui/src/components/Segment/SegmentSelect.tsx
+++ b/packages/grafana-ui/src/components/Segment/SegmentSelect.tsx
@@ -1,6 +1,6 @@
 import React, { HTMLProps, useRef } from 'react';
 import { SelectableValue } from '@grafana/data';
-import { Select } from '../Select/Select';
+import { AsyncSelect, Select } from '../Select/Select';
 import { useTheme2 } from '../../themes/ThemeContext';
 
 /** @internal
@@ -11,6 +11,10 @@ export interface Props<T> extends Omit<HTMLProps<HTMLDivElement>, 'value' | 'onC
   value?: SelectableValue<T>;
   options: Array<SelectableValue<T>>;
   onChange: (item: SelectableValue<T>) => void;
+  /**
+   * If provided - AsyncSelect will be used allowing to reload options when the value in the input changes
+   */
+  loadOptions?: (inputValue: string) => Promise<Array<SelectableValue<T>>>;
   onClickOutside: () => void;
   width: number;
   noOptionsMessage?: string;
@@ -30,6 +34,7 @@ export function SegmentSelect<T>({
   options = [],
   onChange,
   onClickOutside,
+  loadOptions = undefined,
   width: widthPixels,
   noOptionsMessage = '',
   allowCustomValue = false,
@@ -41,9 +46,18 @@ export function SegmentSelect<T>({
 
   let width = widthPixels > 0 ? widthPixels / theme.spacing.gridSize : undefined;
 
+  let Component;
+  let asyncOptions = {};
+  if (loadOptions) {
+    Component = AsyncSelect;
+    asyncOptions = { loadOptions, defaultOptions: true };
+  } else {
+    Component = Select;
+  }
+
   return (
     <div {...rest} ref={ref}>
-      <Select
+      <Component
         menuShouldPortal
         width={width}
         noOptionsMessage={noOptionsMessage}
@@ -70,6 +84,7 @@ export function SegmentSelect<T>({
           }
         }}
         allowCustomValue={allowCustomValue}
+        {...asyncOptions}
       />
     </div>
   );
diff --git a/public/app/core/angular_wrappers.ts b/public/app/core/angular_wrappers.ts
index 1be90b1dbdb..0b695b30911 100644
--- a/public/app/core/angular_wrappers.ts
+++ b/public/app/core/angular_wrappers.ts
@@ -29,6 +29,7 @@ import { GraphiteTextEditor } from '../plugins/datasource/graphite/components/Gr
 import { PlayButton } from '../plugins/datasource/graphite/components/PlayButton';
 import { AddGraphiteFunction } from '../plugins/datasource/graphite/components/AddGraphiteFunction';
 import { GraphiteFunctionEditor } from '../plugins/datasource/graphite/components/GraphiteFunctionEditor';
+import { SeriesSection } from '../plugins/datasource/graphite/components/SeriesSection';
 
 const { SecretFormField } = LegacyForms;
 
@@ -211,4 +212,5 @@ export function registerAngularDirectives() {
   react2AngularDirective('playButton', PlayButton, ['dispatch']);
   react2AngularDirective('addGraphiteFunction', AddGraphiteFunction, ['funcDefs', 'dispatch']);
   react2AngularDirective('graphiteFunctionEditor', GraphiteFunctionEditor, ['func', 'dispatch']);
+  react2AngularDirective('seriesSection', SeriesSection, ['state', 'dispatch']);
 }
diff --git a/public/app/plugins/datasource/graphite/components/MetricSegment.tsx b/public/app/plugins/datasource/graphite/components/MetricSegment.tsx
new file mode 100644
index 00000000000..4afcfe4a67c
--- /dev/null
+++ b/public/app/plugins/datasource/graphite/components/MetricSegment.tsx
@@ -0,0 +1,59 @@
+import React, { useCallback, useMemo } from 'react';
+import { SegmentAsync } from '@grafana/ui';
+import { actions } from '../state/actions';
+import { Dispatch } from 'redux';
+import { GraphiteSegment } from '../types';
+import { SelectableValue } from '@grafana/data';
+import { getAltSegmentsSelectables } from '../state/providers';
+import { debounce } from 'lodash';
+import { GraphiteQueryEditorState } from '../state/store';
+
+type Props = {
+  segment: GraphiteSegment;
+  metricIndex: number;
+  dispatch: Dispatch;
+  state: GraphiteQueryEditorState;
+};
+
+/**
+ * Represents a single metric node in the metric path at the given index. Allows to change the metric name to one of the
+ * provided options or a custom value.
+ *
+ * Options for tag names and metric names are reloaded while user is typing with backend taking care of auto-complete
+ * (auto-complete cannot be implemented in front-end because backend returns only limited number of entries)
+ *
+ * getAltSegmentsSelectables() also returns list of tags for segment with index=0. Once a tag is selected the editor
+ * enters tag-adding mode (see SeriesSection and GraphiteQueryModel.seriesByTagUsed).
+ */
+export function MetricSegment({ dispatch, metricIndex, segment, state }: Props) {
+  const loadOptions = useCallback(
+    (value: string | undefined) => {
+      return getAltSegmentsSelectables(state, metricIndex, value || '');
+    },
+    [state, metricIndex]
+  );
+  const debouncedLoadOptions = useMemo(() => debounce(loadOptions, 200, { leading: true }), [loadOptions]);
+
+  const onSegmentChanged = useCallback(
+    (selectableValue: SelectableValue<GraphiteSegment | string>) => {
+      // selectableValue.value is always defined because emptyValues are not allowed in SegmentAsync by default
+      dispatch(actions.segmentValueChanged({ segment: selectableValue.value!, index: metricIndex }));
+    },
+    [dispatch, metricIndex]
+  );
+
+  // segmentValueChanged action will destroy SegmentAsync immediately if a tag is selected. To give time
+  // for the clean up the action is debounced.
+  const onSegmentChangedDebounced = useMemo(() => debounce(onSegmentChanged, 100), [onSegmentChanged]);
+
+  return (
+    <SegmentAsync<GraphiteSegment | string>
+      value={segment.value}
+      inputMinWidth={150}
+      allowCustomValue={true}
+      loadOptions={debouncedLoadOptions}
+      reloadOptionsOnChange={true}
+      onChange={onSegmentChangedDebounced}
+    />
+  );
+}
diff --git a/public/app/plugins/datasource/graphite/components/MetricsSection.tsx b/public/app/plugins/datasource/graphite/components/MetricsSection.tsx
new file mode 100644
index 00000000000..6dd3e5fea62
--- /dev/null
+++ b/public/app/plugins/datasource/graphite/components/MetricsSection.tsx
@@ -0,0 +1,34 @@
+import React from 'react';
+import { Dispatch } from 'redux';
+import { GraphiteSegment } from '../types';
+import { GraphiteQueryEditorState } from '../state/store';
+import { MetricSegment } from './MetricSegment';
+import { css } from '@emotion/css';
+import { useStyles2 } from '@grafana/ui';
+
+type Props = {
+  segments: GraphiteSegment[];
+  dispatch: Dispatch;
+  state: GraphiteQueryEditorState;
+};
+
+export function MetricsSection({ dispatch, segments = [], state }: Props) {
+  const styles = useStyles2(getStyles);
+
+  return (
+    <div className={styles.container}>
+      {segments.map((segment, index) => {
+        return <MetricSegment segment={segment} metricIndex={index} key={index} dispatch={dispatch} state={state} />;
+      })}
+    </div>
+  );
+}
+
+function getStyles() {
+  return {
+    container: css`
+      display: flex;
+      flex-direction: row;
+    `,
+  };
+}
diff --git a/public/app/plugins/datasource/graphite/components/SeriesSection.tsx b/public/app/plugins/datasource/graphite/components/SeriesSection.tsx
new file mode 100644
index 00000000000..647a4232fc9
--- /dev/null
+++ b/public/app/plugins/datasource/graphite/components/SeriesSection.tsx
@@ -0,0 +1,23 @@
+import React from 'react';
+import { Dispatch } from 'redux';
+import { GraphiteQueryEditorState } from '../state/store';
+import { TagsSection } from './TagsSection';
+import { MetricsSection } from './MetricsSection';
+
+type Props = {
+  dispatch: Dispatch;
+  state: GraphiteQueryEditorState;
+};
+
+export function SeriesSection({ dispatch, state }: Props) {
+  return state.queryModel?.seriesByTagUsed ? (
+    <TagsSection
+      dispatch={dispatch}
+      tags={state.queryModel?.tags}
+      addTagSegments={state.addTagSegments}
+      state={state}
+    />
+  ) : (
+    <MetricsSection dispatch={dispatch} segments={state.segments} state={state} />
+  );
+}
diff --git a/public/app/plugins/datasource/graphite/components/TagEditor.tsx b/public/app/plugins/datasource/graphite/components/TagEditor.tsx
new file mode 100644
index 00000000000..d22b8f6d7bd
--- /dev/null
+++ b/public/app/plugins/datasource/graphite/components/TagEditor.tsx
@@ -0,0 +1,91 @@
+import React, { useCallback, useMemo } from 'react';
+import { Dispatch } from 'redux';
+import { Segment, SegmentAsync } from '@grafana/ui';
+import { actions } from '../state/actions';
+import { GraphiteTag, GraphiteTagOperator } from '../types';
+import { getTagOperatorsSelectables, getTagsSelectables, getTagValuesSelectables } from '../state/providers';
+import { GraphiteQueryEditorState } from '../state/store';
+import { debounce } from 'lodash';
+
+type Props = {
+  tag: GraphiteTag;
+  tagIndex: number;
+  dispatch: Dispatch;
+  state: GraphiteQueryEditorState;
+};
+
+/**
+ * Editor for a tag at given index. Allows changing the name of the tag, operator or value. Tag names are provided with
+ * getTagsSelectables and contain only valid tags (it may depend on currently used tags). The dropdown for tag names is
+ * also used for removing tag (with a special "--remove tag--" option provided by getTagsSelectables).
+ *
+ * Options for tag names and values are reloaded while user is typing with backend taking care of auto-complete
+ * (auto-complete cannot be implemented in front-end because backend returns only limited number of entries)
+ */
+export function TagEditor({ dispatch, tag, tagIndex, state }: Props) {
+  const getTagsOptions = useCallback(
+    (inputValue: string | undefined) => {
+      return getTagsSelectables(state, tagIndex, inputValue || '');
+    },
+    [state, tagIndex]
+  );
+  const debouncedGetTagsOptions = useMemo(() => debounce(getTagsOptions, 200, { leading: true }), [getTagsOptions]);
+
+  const getTagValueOptions = useCallback(
+    (inputValue: string | undefined) => {
+      return getTagValuesSelectables(state, tag, tagIndex, inputValue || '');
+    },
+    [state, tagIndex, tag]
+  );
+  const debouncedGetTagValueOptions = useMemo(() => debounce(getTagValueOptions, 200, { leading: true }), [
+    getTagValueOptions,
+  ]);
+
+  return (
+    <>
+      <SegmentAsync
+        inputMinWidth={150}
+        value={tag.key}
+        loadOptions={debouncedGetTagsOptions}
+        reloadOptionsOnChange={true}
+        onChange={(value) => {
+          dispatch(
+            actions.tagChanged({
+              tag: { ...tag, key: value.value! },
+              index: tagIndex,
+            })
+          );
+        }}
+        allowCustomValue={true}
+      />
+      <Segment<GraphiteTagOperator>
+        inputMinWidth={50}
+        value={tag.operator}
+        options={getTagOperatorsSelectables()}
+        onChange={(value) => {
+          dispatch(
+            actions.tagChanged({
+              tag: { ...tag, operator: value.value! },
+              index: tagIndex,
+            })
+          );
+        }}
+      />
+      <SegmentAsync
+        inputMinWidth={150}
+        value={tag.value}
+        loadOptions={debouncedGetTagValueOptions}
+        reloadOptionsOnChange={true}
+        onChange={(value) => {
+          dispatch(
+            actions.tagChanged({
+              tag: { ...tag, value: value.value! },
+              index: tagIndex,
+            })
+          );
+        }}
+        allowCustomValue={true}
+      />
+    </>
+  );
+}
diff --git a/public/app/plugins/datasource/graphite/components/TagsSection.tsx b/public/app/plugins/datasource/graphite/components/TagsSection.tsx
new file mode 100644
index 00000000000..2a59005268d
--- /dev/null
+++ b/public/app/plugins/datasource/graphite/components/TagsSection.tsx
@@ -0,0 +1,75 @@
+import React, { useCallback, useMemo } from 'react';
+import { Dispatch } from 'redux';
+import { GraphiteSegment } from '../types';
+import { GraphiteTag } from '../graphite_query';
+import { GraphiteQueryEditorState } from '../state/store';
+import { getTagsAsSegmentsSelectables } from '../state/providers';
+import { Button, SegmentAsync, useStyles2 } from '@grafana/ui';
+import { actions } from '../state/actions';
+import { GrafanaTheme2 } from '@grafana/data';
+import { css } from '@emotion/css';
+import { mapSegmentsToSelectables } from './helpers';
+import { TagEditor } from './TagEditor';
+import { debounce } from 'lodash';
+
+type Props = {
+  dispatch: Dispatch;
+  tags: GraphiteTag[];
+  addTagSegments: GraphiteSegment[];
+  state: GraphiteQueryEditorState;
+};
+
+/**
+ * Renders all tags and a button allowing to add more tags.
+ *
+ * Options for tag names are reloaded while user is typing with backend taking care of auto-complete
+ * (auto-complete cannot be implemented in front-end because backend returns only limited number of entries)
+ */
+export function TagsSection({ dispatch, tags, state, addTagSegments }: Props) {
+  const styles = useStyles2(getStyles);
+
+  const newTagsOptions = mapSegmentsToSelectables(addTagSegments || []);
+
+  // Options are reloaded while user is typing with backend taking care of auto-complete (auto-complete cannot be
+  // implemented in front-end because backend returns only limited number of entries)
+  const getTagsAsSegmentsOptions = useCallback(
+    (inputValue?: string) => {
+      return getTagsAsSegmentsSelectables(state, inputValue || '');
+    },
+    [state]
+  );
+  const debouncedGetTagsAsSegments = useMemo(() => debounce(getTagsAsSegmentsOptions, 200, { leading: true }), [
+    getTagsAsSegmentsOptions,
+  ]);
+
+  return (
+    <div className={styles.container}>
+      {tags.map((tag, index) => {
+        return <TagEditor key={index} tagIndex={index} tag={tag} dispatch={dispatch} state={state} />;
+      })}
+      {newTagsOptions.length && (
+        <SegmentAsync<GraphiteSegment>
+          inputMinWidth={150}
+          onChange={(value) => {
+            dispatch(actions.addNewTag({ segment: value.value! }));
+          }}
+          loadOptions={debouncedGetTagsAsSegments}
+          reloadOptionsOnChange={true}
+          Component={<Button icon="plus" variant="secondary" className={styles.button} />}
+        />
+      )}
+    </div>
+  );
+}
+
+function getStyles(theme: GrafanaTheme2) {
+  return {
+    container: css`
+      display: flex;
+      flex-direction: row;
+    `,
+    button: css`
+      margin-right: ${theme.spacing(0.5)};
+    `,
+  };
+}
diff --git a/public/app/plugins/datasource/graphite/components/helpers.ts b/public/app/plugins/datasource/graphite/components/helpers.ts
index 4f7d929c1eb..39578b7edd7 100644
--- a/public/app/plugins/datasource/graphite/components/helpers.ts
+++ b/public/app/plugins/datasource/graphite/components/helpers.ts
@@ -2,6 +2,21 @@ import { FuncDefs, FuncInstance, ParamDef } from '../gfunc';
 import { forEach, sortBy } from 'lodash';
 import { SelectableValue } from '@grafana/data';
 import { EditableParam } from './FunctionParamEditor';
+import { GraphiteSegment } from '../types';
+
+export function mapStringsToSelectables<T extends string>(values: T[]): Array<SelectableValue<T>> {
+  return values.map((value) => ({
+    value,
+    label: value,
+  }));
+}
+
+export function mapSegmentsToSelectables(segments: GraphiteSegment[]): Array<SelectableValue<GraphiteSegment>> {
+  return segments.map((segment) => ({
+    label: segment.value,
+    value: segment,
+  }));
+}
 
 export function mapFuncDefsToSelectables(funcDefs: FuncDefs): Array<SelectableValue<string>> {
   const categories: any = {};
diff --git a/public/app/plugins/datasource/graphite/graphite_query.ts b/public/app/plugins/datasource/graphite/graphite_query.ts
index b6099c8ce50..a4929c1659f 100644
--- a/public/app/plugins/datasource/graphite/graphite_query.ts
+++ b/public/app/plugins/datasource/graphite/graphite_query.ts
@@ -303,11 +303,15 @@ export default class GraphiteQuery {
 
     if (tag.key === this.removeTagValue) {
       this.removeTag(tagIndex);
+      if (this.tags.length === 0) {
+        this.removeFunction(this.getSeriesByTagFunc());
+        this.checkOtherSegmentsIndex = 0;
+        this.seriesByTagUsed = false;
+      }
       return;
     }
 
-    const newTagParam = renderTagString(tag);
-    this.getSeriesByTagFunc()!.params[tagIndex] = newTagParam;
+    this.getSeriesByTagFunc()!.params[tagIndex] = renderTagString(tag);
     this.tags[tagIndex] = tag;
   }
 
diff --git a/public/app/plugins/datasource/graphite/partials/query.editor.html b/public/app/plugins/datasource/graphite/partials/query.editor.html
index 45011ea7be2..4e5406798d0 100644
--- a/public/app/plugins/datasource/graphite/partials/query.editor.html
+++ b/public/app/plugins/datasource/graphite/partials/query.editor.html
@@ -10,46 +10,7 @@
         <label class="gf-form-label width-6 query-keyword">Series</label>
       </div>
 
-      <div ng-if="ctrl.state.queryModel.seriesByTagUsed" ng-repeat="tag in ctrl.state.queryModel.tags" class="gf-form">
-        <gf-form-dropdown
-          model="tag.key"
-          allow-custom="true"
-          label-mode="true"
-          debounce="true"
-          placeholder="Tag key"
-          css-class="query-segment-key"
-          get-options="ctrl.getTags($index, $query)"
-          on-change="ctrl.tagChanged(tag, $index)"
-        ></gf-form-dropdown>
-
-        <gf-form-dropdown
-          model="tag.operator"
-          label-mode="true"
-          css-class="query-segment-operator"
-          get-options="ctrl.getTagOperators()"
-          on-change="ctrl.tagChanged(tag, $index)"
-          min-input-width="30"
-        ></gf-form-dropdown>
-        <gf-form-dropdown
-          model="tag.value"
-          allow-custom="true"
-          label-mode="true"
-          debounce="true"
-          css-class="query-segment-value"
-          placeholder="Tag value"
-          get-options="ctrl.getTagValues(tag, $index, $query)"
-          on-change="ctrl.tagChanged(tag, $index)"
-        ></gf-form-dropdown>
-        <label class="gf-form-label query-keyword" ng-if="$index !== ctrl.state.queryModel.tags.length - 1">AND</label>
-      </div>
-
-      <div ng-if="ctrl.state.queryModel.seriesByTagUsed" ng-repeat="segment in ctrl.state.addTagSegments" role="menuitem" class="gf-form">
-        <metric-segment segment="segment" get-options="ctrl.getTagsAsSegments($query)" on-change="ctrl.addNewTag(segment)" debounce="true" />
-      </div>
-
-      <div ng-if="!ctrl.state.queryModel.seriesByTagUsed" ng-repeat="segment in ctrl.state.segments" role="menuitem" class="gf-form">
-        <metric-segment segment="segment" get-options="ctrl.getAltSegments($index, $query)" on-change="ctrl.segmentValueChanged(segment, $index)" />
-      </div>
+      <series-section dispatch="ctrl.dispatch" tags="ctrl.state.queryModel.tags" addTagSegments="ctrl.state.addTagSegments" state="ctrl.state"  segments="ctrl.state.segments" rawQuery="ctrl.state.target.target"></series-section>
 
       <div ng-if="ctrl.state.paused" class="gf-form">
         <play-button dispatch="ctrl.dispatch" />
diff --git a/public/app/plugins/datasource/graphite/query_ctrl.ts b/public/app/plugins/datasource/graphite/query_ctrl.ts
index 38c57e6dbe9..f662f3405d6 100644
--- a/public/app/plugins/datasource/graphite/query_ctrl.ts
+++ b/public/app/plugins/datasource/graphite/query_ctrl.ts
@@ -3,10 +3,8 @@ import { QueryCtrl } from 'app/plugins/sdk';
 import { auto } from 'angular';
 import { TemplateSrv } from '@grafana/runtime';
 import { actions } from './state/actions';
-import { getAltSegments, getTagOperators, getTags, getTagsAsSegments, getTagValues } from './state/providers';
 import { createStore, GraphiteQueryEditorState } from './state/store';
 import {
-  AngularDropdownOptions,
   GraphiteActionDispatcher,
   GraphiteQueryEditorAngularDependencies,
   GraphiteSegment,
@@ -30,8 +28,8 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   supportsTags = false;
   paused = false;
 
-  private state: GraphiteQueryEditorState;
-  private readonly dispatch: GraphiteActionDispatcher;
+  state: GraphiteQueryEditorState;
+  readonly dispatch: GraphiteActionDispatcher;
 
   /** @ngInject */
   constructor(
@@ -104,7 +102,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   }
 
   setSegmentFocus(segmentIndex: any) {
-    // WIP: moved to state/helpers (the same name)
+    // WIP: removed
   }
 
   /**
@@ -112,8 +110,8 @@ export class GraphiteQueryCtrl extends QueryCtrl {
    *
    * This is used for new segments and segments with metrics selected.
    */
-  async getAltSegments(index: number, text: string): Promise<GraphiteSegment[]> {
-    return await getAltSegments(this.state, index, text);
+  getAltSegments(index: number, text: string): void {
+    // WIP: moved to state/providers (the same name)
   }
 
   addAltTagSegments(prefix: string, altSegments: any[]) {
@@ -128,7 +126,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
    * Apply changes to a given metric segment
    */
   async segmentValueChanged(segment: GraphiteSegment, index: number) {
-    await this.dispatch(actions.segmentValueChanged({ segment, index }));
+    // WIP: moved to MetricsSegment
   }
 
   spliceSegments(index: any) {
@@ -148,7 +146,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   }
 
   async addFunction(name: string) {
-    await this.dispatch(actions.addFunction({ name }));
+    // WIP: removed, called from AddGraphiteFunction
   }
 
   removeFunction(func: any) {
@@ -177,22 +175,22 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   /**
    * Get list of tags for editing exiting tag with <gf-form-dropdown>
    */
-  async getTags(index: number, query: string): Promise<AngularDropdownOptions[]> {
-    return await getTags(this.state, index, query);
+  getTags(index: number, query: string): void {
+    // WIP: removed, called from TagsSection
   }
 
   /**
    * Get tag list when adding a new tag with <metric-segment>
    */
-  async getTagsAsSegments(query: string): Promise<GraphiteSegment[]> {
-    return await getTagsAsSegments(this.state, query);
+  getTagsAsSegments(query: string): void {
+    // WIP: removed, called from TagsSection
   }
 
   /**
    * Get list of available tag operators
    */
-  getTagOperators(): AngularDropdownOptions[] {
-    return getTagOperators();
+  getTagOperators(): void {
+    // WIP: removed, called from TagsSection
   }
 
   getAllTagValues(tag: { key: any }) {
@@ -202,19 +200,19 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   /**
    * Get list of available tag values
    */
-  async getTagValues(tag: GraphiteTag, index: number, query: string): Promise<AngularDropdownOptions[]> {
-    return await getTagValues(this.state, tag, index, query);
+  getTagValues(tag: GraphiteTag, index: number, query: string): void {
+    // WIP: removed, called from TagsSection
   }
 
   /**
    * Apply changes when a tag is changed
    */
   async tagChanged(tag: GraphiteTag, index: number) {
-    await this.dispatch(actions.tagChanged({ tag, index }));
+    // WIP: removed, called from TagsSection
   }
 
   async addNewTag(segment: GraphiteSegment) {
-    await this.dispatch(actions.addNewTag({ segment }));
+    // WIP: removed, called from TagsSection
   }
 
   removeTag(index: any) {
@@ -235,7 +233,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   }
 
   async unpause() {
-    await this.dispatch(actions.unpause());
+    // WIP: removed, called from PlayButton
   }
 
   getCollapsedText() {
diff --git a/public/app/plugins/datasource/graphite/specs/query_ctrl.test.ts b/public/app/plugins/datasource/graphite/specs/query_ctrl.test.ts
index a1643ec38c9..081ec4114c2 100644
--- a/public/app/plugins/datasource/graphite/specs/query_ctrl.test.ts
+++ b/public/app/plugins/datasource/graphite/specs/query_ctrl.test.ts
@@ -5,6 +5,8 @@ import { GraphiteQueryCtrl } from '../query_ctrl';
 import { TemplateSrvStub } from 'test/specs/helpers';
 import { silenceConsoleOutput } from 'test/core/utils/silenceConsoleOutput';
 import { actions } from '../state/actions';
+import { getAltSegmentsSelectables, getTagsSelectables, getTagsAsSegmentsSelectables } from '../state/providers';
+import { GraphiteSegment } from '../types';
 
 jest.mock('app/core/utils/promiseToDigest', () => ({
   promiseToDigest: (scope: any) => {
@@ -105,8 +107,8 @@ describe('GraphiteQueryCtrl', () => {
 
   describe('when middle segment value of test.prod.* is changed', () => {
     beforeEach(async () => {
-      const segment = { type: 'segment', value: 'test', expandable: true };
-      await ctx.ctrl.segmentValueChanged(segment, 1);
+      const segment: GraphiteSegment = { type: 'metric', value: 'test', expandable: true };
+      await ctx.ctrl.dispatch(actions.segmentValueChanged({ segment: segment, index: 1 }));
     });
 
     it('should validate metric key exists', () => {
@@ -129,7 +131,7 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: false }]);
       await changeTarget(ctx, 'test.prod.*.count');
-      await ctx.ctrl.addFunction(gfunc.getFuncDef('aliasByNode'));
+      await ctx.ctrl.dispatch(actions.addFunction({ name: 'aliasByNode' }));
     });
 
     it('should add function with correct node number', () => {
@@ -149,7 +151,7 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: true }]);
       await changeTarget(ctx, '');
-      await ctx.ctrl.addFunction(gfunc.getFuncDef('asPercent'));
+      await ctx.ctrl.dispatch(actions.addFunction({ name: 'asPercent' }));
     });
 
     it('should add function and remove select metric link', () => {
@@ -191,7 +193,7 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([]);
       await changeTarget(ctx, 'test.count');
-      ctx.altSegments = await ctx.ctrl.getAltSegments(1, '');
+      ctx.altSegments = await getAltSegmentsSelectables(ctx.ctrl.state, 1, '');
     });
 
     it('should have no segments', () => {
@@ -210,9 +212,9 @@ describe('GraphiteQueryCtrl', () => {
       );
     });
 
-    it('getAltSegments should handle autocomplete errors', async () => {
+    it('getAltSegmentsSelectables should handle autocomplete errors', async () => {
       await expect(async () => {
-        await ctx.ctrl.getAltSegments(0, 'any');
+        await getAltSegmentsSelectables(ctx.ctrl.state, 0, 'any');
         expect(mockDispatch).toBeCalledWith(
           expect.objectContaining({
             type: 'appNotifications/notifyApp',
@@ -221,11 +223,11 @@ describe('GraphiteQueryCtrl', () => {
       }).not.toThrow();
     });
 
-    it('getAltSegments should display the error message only once', async () => {
-      await ctx.ctrl.getAltSegments(0, 'any');
+    it('getAltSegmentsSelectables should display the error message only once', async () => {
+      await getAltSegmentsSelectables(ctx.ctrl.state, 0, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
 
-      await ctx.ctrl.getAltSegments(0, 'any');
+      await getAltSegmentsSelectables(ctx.ctrl.state, 0, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
     });
   });
@@ -241,9 +243,9 @@ describe('GraphiteQueryCtrl', () => {
       );
     });
 
-    it('getTags should handle autocomplete errors', async () => {
+    it('getTagsSelectables should handle autocomplete errors', async () => {
       await expect(async () => {
-        await ctx.ctrl.getTags(0, 'any');
+        await getTagsSelectables(ctx.ctrl.state, 0, 'any');
         expect(mockDispatch).toBeCalledWith(
           expect.objectContaining({
             type: 'appNotifications/notifyApp',
@@ -252,17 +254,17 @@ describe('GraphiteQueryCtrl', () => {
       }).not.toThrow();
     });
 
-    it('getTags should display the error message only once', async () => {
-      await ctx.ctrl.getTags(0, 'any');
+    it('getTagsSelectables should display the error message only once', async () => {
+      await getTagsSelectables(ctx.ctrl.state, 0, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
 
-      await ctx.ctrl.getTags(0, 'any');
+      await getTagsSelectables(ctx.ctrl.state, 0, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
     });
 
-    it('getTagsAsSegments should handle autocomplete errors', async () => {
+    it('getTagsAsSegmentsSelectables should handle autocomplete errors', async () => {
       await expect(async () => {
-        await ctx.ctrl.getTagsAsSegments('any');
+        await getTagsAsSegmentsSelectables(ctx.ctrl.state, 'any');
         expect(mockDispatch).toBeCalledWith(
           expect.objectContaining({
             type: 'appNotifications/notifyApp',
@@ -271,11 +273,11 @@ describe('GraphiteQueryCtrl', () => {
       }).not.toThrow();
     });
 
-    it('getTagsAsSegments should display the error message only once', async () => {
-      await ctx.ctrl.getTagsAsSegments('any');
+    it('getTagsAsSegmentsSelectables should display the error message only once', async () => {
+      await getTagsAsSegmentsSelectables(ctx.ctrl.state, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
 
-      await ctx.ctrl.getTagsAsSegments('any');
+      await getTagsAsSegmentsSelectables(ctx.ctrl.state, 'any');
       expect(mockDispatch.mock.calls.length).toBe(1);
     });
   });
@@ -350,7 +352,7 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: false }]);
       await changeTarget(ctx, '');
-      await ctx.ctrl.addFunction(gfunc.getFuncDef('seriesByTag'));
+      await ctx.ctrl.dispatch(actions.addFunction({ name: 'seriesByTag' }));
     });
 
     it('should update functions', () => {
@@ -393,7 +395,7 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: false }]);
       await changeTarget(ctx, 'seriesByTag()');
-      await ctx.ctrl.addNewTag({ value: 'tag1' });
+      await ctx.ctrl.dispatch(actions.addNewTag({ segment: { value: 'tag1' } }));
     });
 
     it('should update tags with default value', () => {
@@ -411,7 +413,9 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: false }]);
       await changeTarget(ctx, "seriesByTag('tag1=value1', 'tag2!=~value2')");
-      await ctx.ctrl.tagChanged({ key: 'tag1', operator: '=', value: 'new_value' }, 0);
+      await ctx.ctrl.dispatch(
+        actions.tagChanged({ tag: { key: 'tag1', operator: '=', value: 'new_value' }, index: 0 })
+      );
     });
 
     it('should update tags', () => {
@@ -432,7 +436,9 @@ describe('GraphiteQueryCtrl', () => {
     beforeEach(async () => {
       ctx.ctrl.state.datasource.metricFindQuery = () => Promise.resolve([{ expandable: false }]);
       await changeTarget(ctx, "seriesByTag('tag1=value1', 'tag2!=~value2')");
-      await ctx.ctrl.tagChanged({ key: ctx.ctrl.state.removeTagValue });
+      await ctx.ctrl.dispatch(
+        actions.tagChanged({ tag: { key: ctx.ctrl.state.removeTagValue, operator: '=', value: '' }, index: 0 })
+      );
     });
 
     it('should update tags', () => {
diff --git a/public/app/plugins/datasource/graphite/state/actions.ts b/public/app/plugins/datasource/graphite/state/actions.ts
index a6debe6e658..951cc086341 100644
--- a/public/app/plugins/datasource/graphite/state/actions.ts
+++ b/public/app/plugins/datasource/graphite/state/actions.ts
@@ -12,7 +12,7 @@ import { FuncInstance } from '../gfunc';
 const init = createAction<GraphiteQueryEditorAngularDependencies>('init');
 
 // Metrics & Tags
-const segmentValueChanged = createAction<{ segment: GraphiteSegment; index: number }>('segment-value-changed');
+const segmentValueChanged = createAction<{ segment: GraphiteSegment | string; index: number }>('segment-value-changed');
 
 // Tags
 const addNewTag = createAction<{ segment: GraphiteSegment }>('add-new-tag');
diff --git a/public/app/plugins/datasource/graphite/state/helpers.ts b/public/app/plugins/datasource/graphite/state/helpers.ts
index aab47cae561..589b9ea24d4 100644
--- a/public/app/plugins/datasource/graphite/state/helpers.ts
+++ b/public/app/plugins/datasource/graphite/state/helpers.ts
@@ -1,15 +1,16 @@
 import { GraphiteQueryEditorState } from './store';
-import { each, map } from 'lodash';
+import { map } from 'lodash';
 import { dispatch } from '../../../../store/store';
 import { notifyApp } from '../../../../core/reducers/appNotification';
 import { createErrorNotification } from '../../../../core/copy/appNotification';
 import { FuncInstance } from '../gfunc';
+import { GraphiteTagOperator } from '../types';
 
 /**
  * Helpers used by reducers and providers. They modify state object directly so should operate on a copy of the state.
  */
 
-export const GRAPHITE_TAG_OPERATORS = ['=', '!=', '=~', '!=~'];
+export const GRAPHITE_TAG_OPERATORS: GraphiteTagOperator[] = ['=', '!=', '=~', '!=~'];
 
 /**
  * Tag names and metric names are displayed in a single dropdown. This prefix is used to
@@ -96,18 +97,6 @@ export async function checkOtherSegments(
   }
 }
 
-/**
- * Changes segment being in focus. After changing the value, next segment gets focus.
- *
- * Note: It's a bit hidden feature. After selecting one metric, and pressing down arrow the dropdown can be expanded.
- * But there's nothing indicating what's in focus and how to expand the dropdown.
- */
-export function setSegmentFocus(state: GraphiteQueryEditorState, segmentIndex: number): void {
-  each(state.segments, (segment, index) => {
-    segment.focus = segmentIndex === index;
-  });
-}
-
 export function spliceSegments(state: GraphiteQueryEditorState, index: number): void {
   state.segments = state.segments.splice(0, index);
   state.queryModel.segments = state.queryModel.segments.splice(0, index);
diff --git a/public/app/plugins/datasource/graphite/state/providers.ts b/public/app/plugins/datasource/graphite/state/providers.ts
index e63490cb7f9..8def95bf3e8 100644
--- a/public/app/plugins/datasource/graphite/state/providers.ts
+++ b/public/app/plugins/datasource/graphite/state/providers.ts
@@ -6,7 +6,9 @@ import {
   handleMetricsAutoCompleteError,
   handleTagsAutoCompleteError,
 } from './helpers';
-import { AngularDropdownOptions, GraphiteSegment, GraphiteTag } from '../types';
+import { GraphiteSegment, GraphiteTag, GraphiteTagOperator } from '../types';
+import { mapSegmentsToSelectables, mapStringsToSelectables } from '../components/helpers';
+import { SelectableValue } from '@grafana/data';
 
 /**
  * Providers are hooks for views to provide temporal data for autocomplete. They don't modify the state.
@@ -19,7 +21,7 @@ import { AngularDropdownOptions, GraphiteSegment, GraphiteTag } from '../types';
  * - mixed list of metrics and tags (only when nothing was selected)
  * - list of metric names (if a metric name was selected for this segment)
  */
-export async function getAltSegments(
+async function getAltSegments(
   state: GraphiteQueryEditorState,
   index: number,
   prefix: string
@@ -90,25 +92,29 @@ export async function getAltSegments(
   return [];
 }
 
-export function getTagOperators(): AngularDropdownOptions[] {
-  return mapToDropdownOptions(GRAPHITE_TAG_OPERATORS);
+export async function getAltSegmentsSelectables(
+  state: GraphiteQueryEditorState,
+  index: number,
+  prefix: string
+): Promise<Array<SelectableValue<GraphiteSegment>>> {
+  return mapSegmentsToSelectables(await getAltSegments(state, index, prefix));
+}
+
+export function getTagOperatorsSelectables(): Array<SelectableValue<GraphiteTagOperator>> {
+  return mapStringsToSelectables(GRAPHITE_TAG_OPERATORS);
 }
 
 /**
  * Returns tags as dropdown options
  */
-export async function getTags(
-  state: GraphiteQueryEditorState,
-  index: number,
-  tagPrefix: string
-): Promise<AngularDropdownOptions[]> {
+async function getTags(state: GraphiteQueryEditorState, index: number, tagPrefix: string): Promise<string[]> {
   try {
     const tagExpressions = state.queryModel.renderTagExpressions(index);
     const values = await state.datasource.getTagsAutoComplete(tagExpressions, tagPrefix);
 
     const altTags = map(values, 'text');
     altTags.splice(0, 0, state.removeTagValue);
-    return mapToDropdownOptions(altTags);
+    return altTags;
   } catch (err) {
     handleTagsAutoCompleteError(state, err);
   }
@@ -116,15 +122,20 @@ export async function getTags(
   return [];
 }
 
+export async function getTagsSelectables(
+  state: GraphiteQueryEditorState,
+  index: number,
+  tagPrefix: string
+): Promise<Array<SelectableValue<string>>> {
+  return mapStringsToSelectables(await getTags(state, index, tagPrefix));
+}
+
 /**
  * List of tags when a tag is added. getTags is used for editing.
  * When adding - segment is used. When editing - dropdown is used.
  */
-export async function getTagsAsSegments(
-  state: GraphiteQueryEditorState,
-  tagPrefix: string
-): Promise<GraphiteSegment[]> {
-  let tagsAsSegments: GraphiteSegment[] = [];
+async function getTagsAsSegments(state: GraphiteQueryEditorState, tagPrefix: string): Promise<GraphiteSegment[]> {
+  let tagsAsSegments: GraphiteSegment[];
   try {
     const tagExpressions = state.queryModel.renderTagExpressions();
     const values = await state.datasource.getTagsAutoComplete(tagExpressions, tagPrefix);
@@ -143,12 +154,19 @@ export async function getTagsAsSegments(
   return tagsAsSegments;
 }
 
-export async function getTagValues(
+export async function getTagsAsSegmentsSelectables(
+  state: GraphiteQueryEditorState,
+  tagPrefix: string
+): Promise<Array<SelectableValue<GraphiteSegment>>> {
+  return mapSegmentsToSelectables(await getTagsAsSegments(state, tagPrefix));
+}
+
+async function getTagValues(
   state: GraphiteQueryEditorState,
   tag: GraphiteTag,
   index: number,
   valuePrefix: string
-): Promise<AngularDropdownOptions[]> {
+): Promise<string[]> {
   const tagExpressions = state.queryModel.renderTagExpressions(index);
   const tagKey = tag.key;
   const values = await state.datasource.getTagValuesAutoComplete(tagExpressions, tagKey, valuePrefix, {});
@@ -158,7 +176,16 @@ export async function getTagValues(
     altValues.push('${' + variable.name + ':regex}');
   });
 
-  return mapToDropdownOptions(altValues);
+  return altValues;
+}
+
+export async function getTagValuesSelectables(
+  state: GraphiteQueryEditorState,
+  tag: GraphiteTag,
+  index: number,
+  valuePrefix: string
+): Promise<Array<SelectableValue<string>>> {
+  return mapStringsToSelectables(await getTagValues(state, tag, index, valuePrefix));
 }
 
 /**
@@ -182,9 +209,3 @@ async function addAltTagSegments(
 function removeTaggedEntry(altSegments: GraphiteSegment[]) {
   remove(altSegments, (s) => s.value === '_tagged');
 }
-
-function mapToDropdownOptions(results: string[]) {
-  return map(results, (value) => {
-    return { text: value, value: value };
-  });
-}
diff --git a/public/app/plugins/datasource/graphite/state/store.ts b/public/app/plugins/datasource/graphite/state/store.ts
index 9c35df2082b..3a51bc77842 100644
--- a/public/app/plugins/datasource/graphite/state/store.ts
+++ b/public/app/plugins/datasource/graphite/state/store.ts
@@ -14,7 +14,6 @@ import {
   parseTarget,
   pause,
   removeTagPrefix,
-  setSegmentFocus,
   smartlyHandleNewAliasByNode,
   spliceSegments,
 } from './helpers';
@@ -72,9 +71,22 @@ const reducer = async (action: Action, state: GraphiteQueryEditorState): Promise
     await buildSegments(state, false);
   }
   if (actions.segmentValueChanged.match(action)) {
-    const { segment, index: segmentIndex } = action.payload;
+    const { segment: segmentOrString, index: segmentIndex } = action.payload;
+
+    let segment;
+    // is segment was changed to a string - create a new segment
+    if (typeof segmentOrString === 'string') {
+      segment = {
+        value: segmentOrString,
+        expandable: true,
+        fake: false,
+      };
+    } else {
+      segment = segmentOrString as GraphiteSegment;
+    }
 
     state.error = null;
+    state.segments[segmentIndex] = segment;
     state.queryModel.updateSegmentValue(segment, segmentIndex);
 
     if (state.queryModel.functions.length > 0 && state.queryModel.functions[0].def.fake) {
@@ -88,21 +100,24 @@ const reducer = async (action: Action, state: GraphiteQueryEditorState): Promise
       return state;
     }
 
+    // if newly selected segment can be expanded -> check if the path is correct
     if (segment.expandable) {
       await checkOtherSegments(state, segmentIndex + 1);
-      setSegmentFocus(state, segmentIndex + 1);
-      handleTargetChanged(state);
     } else {
+      // if not expandable -> remove all other segments
       spliceSegments(state, segmentIndex + 1);
     }
 
-    setSegmentFocus(state, segmentIndex + 1);
     handleTargetChanged(state);
   }
   if (actions.tagChanged.match(action)) {
     const { tag, index: tagIndex } = action.payload;
     state.queryModel.updateTag(tag, tagIndex);
     handleTargetChanged(state);
+    if (state.queryModel.tags.length === 0) {
+      await checkOtherSegments(state, 0);
+      state.paused = false;
+    }
   }
   if (actions.addNewTag.match(action)) {
     const segment = action.payload.segment;
diff --git a/public/app/plugins/datasource/graphite/types.ts b/public/app/plugins/datasource/graphite/types.ts
index 66774016e2e..a6a348de290 100644
--- a/public/app/plugins/datasource/graphite/types.ts
+++ b/public/app/plugins/datasource/graphite/types.ts
@@ -60,7 +60,6 @@ export type GraphiteSegment = {
   value: string;
   type?: 'tag' | 'metric' | 'series-ref';
   expandable?: boolean;
-  focus?: boolean;
   fake?: boolean;
 };