feat(dashboard): add ability to change order of variable dropdowns

CHANGELOG.md

@@ -7,7 +7,7 @@
 1. [12655](https://github.com/influxdata/influxdb/pull/12655): Add a variable control bar to dashboards to select values for variables.
 1. [12706](https://github.com/influxdata/influxdb/pull/12706): Add ability to add variable to script from the side menu.
 1. [12791](https://github.com/influxdata/influxdb/pull/12791): Use time range for metaqueries in Data Explorer and Cell Editor Overlay
-1. [12827](https://github.com/influxdata/influxdb/pull/12827): Fix screen tearing bug in Raw Data View
+1. [12821](https://github.com/influxdata/influxdb/pull/12821): Allow variables to be re-ordered within control bar on a dashboard.
 
 ### Bug Fixes
 
@@ -17,6 +17,7 @@
 1. [12790](https://github.com/influxdata/influxdb/pull/12790): Fix bucket creation error when changing rentention rules types.
 1. [12793](https://github.com/influxdata/influxdb/pull/12793): Fix task creation error when switching schedule types.
 1. [12805](https://github.com/influxdata/influxdb/pull/12805): Fix hidden horizonal scrollbars in flux raw data view
+1. [12827](https://github.com/influxdata/influxdb/pull/12827): Fix screen tearing bug in Raw Data View
 
 ### UI Improvements
 

ui/src/dashboards/components/variablesControlBar/DraggableDropdown.tsx

@@ -0,0 +1,118 @@
+// Libraries
+import * as React from 'react'
+import {
+  DragSource,
+  DropTarget,
+  ConnectDropTarget,
+  ConnectDragSource,
+  DropTargetConnector,
+  DragSourceConnector,
+  DragSourceMonitor,
+} from 'react-dnd'
+import classnames from 'classnames'
+
+// Components
+import VariableDropdown from './VariableDropdown'
+
+// Constants
+const dropdownType = 'dropdown'
+
+const dropdownSource = {
+  beginDrag(props: Props) {
+    return {
+      id: props.id,
+      index: props.index,
+    }
+  },
+}
+
+interface Props {
+  id: string
+  index: number
+  name: string
+  moveDropdown: (dragIndex: number, hoverIndex: number) => void
+  dashboardID: string
+}
+
+interface DropdownSourceCollectedProps {
+  isDragging: boolean
+  connectDragSource: ConnectDragSource
+}
+
+interface DropdownTargetCollectedProps {
+  connectDropTarget?: ConnectDropTarget
+}
+
+const dropdownTarget = {
+  hover(props, monitor, component) {
+    if (!component) {
+      return null
+    }
+    const dragIndex = monitor.getItem().index
+    const hoverIndex = props.index
+
+    // Don't replace items with themselves
+    if (dragIndex === hoverIndex) {
+      return
+    }
+
+    // Time to actually perform the action
+    props.moveDropdown(dragIndex, hoverIndex)
+
+    monitor.getItem().index = hoverIndex
+  },
+}
+
+class Dropdown extends React.Component<
+  Props & DropdownSourceCollectedProps & DropdownTargetCollectedProps
+> {
+  public render() {
+    const {
+      name,
+      id,
+      dashboardID,
+      isDragging,
+      connectDragSource,
+      connectDropTarget,
+    } = this.props
+
+    const className = classnames('variable-dropdown', {
+      'variable-dropdown__dragging': isDragging,
+    })
+
+    return connectDragSource(
+      connectDropTarget(
+        <div style={{display: 'inline-block'}}>
+          <div className={className}>
+            {/* TODO: Add variable description to title attribute when it is ready */}
+            <div className="variable-dropdown--label">
+              <div className="customizable-field--drag">
+                <span className="hamburger" />
+              </div>
+              <span>{name}</span>
+            </div>
+            <div className="variable-dropdown--placeholder" />
+            <VariableDropdown variableID={id} dashboardID={dashboardID} />
+          </div>
+        </div>
+      )
+    )
+  }
+}
+
+export default DropTarget<Props & DropdownTargetCollectedProps>(
+  dropdownType,
+  dropdownTarget,
+  (connect: DropTargetConnector) => ({
+    connectDropTarget: connect.dropTarget(),
+  })
+)(
+  DragSource<Props & DropdownSourceCollectedProps>(
+    dropdownType,
+    dropdownSource,
+    (connect: DragSourceConnector, monitor: DragSourceMonitor) => ({
+      connectDragSource: connect.dragSource(),
+      isDragging: monitor.isDragging(),
+    })
+  )(Dropdown)
+)

ui/src/dashboards/components/variablesControlBar/VariableDropdown.scss

@@ -4,6 +4,8 @@
   display: flex;
   flex-direction: row;
   height: $form-sm-height;
+  position: relative;
+  border-radius: $radius;
 }
 
 .variable-dropdown--dropdown {
@@ -21,14 +23,33 @@
   color: $c-comet;
   white-space: nowrap;
   overflow: hidden;
-  padding: 0 $form-sm-padding;
+  padding: 0 $form-sm-padding 0 0;
   border-radius: $radius 0 0 $radius;
   background-color: $g3-castle;
   background-attachment: fixed;
+  display: flex;
 
   > span {
     @include gradient-h($c-comet, $c-laser);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
   }
 }
+
+.variable-dropdown--placeholder {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  border-radius: $radius;
+  @include gradient-h($c-comet, $c-pool);
+  opacity: 0;
+  pointer-events: none;
+  z-index: 2;
+  transition: opacity 0.25s ease;
+
+  .variable-dropdown__dragging & {
+    opacity: 1;
+  }
+}

ui/src/dashboards/components/variablesControlBar/VariableDropdown.tsx

@@ -29,7 +29,6 @@ interface DispatchProps {
 }
 
 interface OwnProps {
-  name: string
   variableID: string
   dashboardID: string
 }
@@ -38,15 +37,12 @@ type Props = StateProps & DispatchProps & OwnProps
 
 class VariableDropdown extends PureComponent<Props> {
   render() {
-    const {name, selectedValue} = this.props
+    const {selectedValue} = this.props
     const dropdownValues = this.props.values || []
 
     return (
       <div className="variable-dropdown">
         {/* TODO: Add variable description to title attribute when it is ready */}
-        <div className="variable-dropdown--label">
-          <span>{name}</span>
-        </div>
         <Dropdown
           selectedID={selectedValue}
           onChange={this.handleSelect}

ui/src/dashboards/components/variablesControlBar/VariablesControlBar.tsx

@@ -1,10 +1,12 @@
 // Libraries
 import React, {PureComponent} from 'react'
 import {connect} from 'react-redux'
-import _ from 'lodash'
+import {isEmpty} from 'lodash'
+import {DragDropContext} from 'react-dnd'
+import HTML5Backend from 'react-dnd-html5-backend'
 
 // Components
-import VariableDropdown from 'src/dashboards/components/variablesControlBar/VariableDropdown'
+// import VariableDropdown from 'src/dashboards/components/variablesControlBar/VariableDropdown'
 import {EmptyState, ComponentSize} from 'src/clockface'
 import {TechnoSpinner} from '@influxdata/clockface'
 
@@ -14,13 +16,20 @@ import {
   getDashboardValuesStatus,
 } from 'src/variables/selectors'
 
+// Styles
+import 'src/dashboards/components/variablesControlBar/VariablesControlBar.scss'
+
+// Actions
+import {moveVariable} from 'src/variables/actions'
+
 // Types
 import {AppState} from 'src/types/v2'
 import {Variable} from '@influxdata/influx'
 
 // Decorators
 import {ErrorHandling} from 'src/shared/decorators/errors'
 import {RemoteDataState} from 'src/types'
+import DraggableDropdown from 'src/dashboards/components/variablesControlBar/DraggableDropdown'
 
 interface OwnProps {
   dashboardID: string
@@ -31,14 +40,18 @@ interface StateProps {
   valuesStatus: RemoteDataState
 }
 
-type Props = StateProps & OwnProps
+interface DispatchProps {
+  moveVariable: typeof moveVariable
+}
+
+type Props = StateProps & DispatchProps & OwnProps
 
 @ErrorHandling
 class VariablesControlBar extends PureComponent<Props> {
   render() {
     const {dashboardID, variables, valuesStatus} = this.props
 
-    if (_.isEmpty(variables)) {
+    if (isEmpty(variables)) {
       return (
         <div className="variables-control-bar">
           <EmptyState
@@ -53,12 +66,14 @@ class VariablesControlBar extends PureComponent<Props> {
 
     return (
       <div className="variables-control-bar">
-        {variables.map(v => (
-          <VariableDropdown
+        {variables.map((v, i) => (
+          <DraggableDropdown
             key={v.id}
             name={v.name}
-            variableID={v.id}
+            id={v.id}
+            index={i}
             dashboardID={dashboardID}
+            moveDropdown={this.handleMoveDropdown}
           />
         ))}
         {valuesStatus === RemoteDataState.Loading && (
@@ -67,6 +82,18 @@ class VariablesControlBar extends PureComponent<Props> {
       </div>
     )
   }
+
+  private handleMoveDropdown = (
+    originalIndex: number,
+    newIndex: number
+  ): void => {
+    const {dashboardID, moveVariable} = this.props
+    moveVariable(originalIndex, newIndex, dashboardID)
+  }
+}
+
+const mdtp = {
+  moveVariable,
 }
 
 const mstp = (state: AppState, props: OwnProps): StateProps => {
@@ -76,4 +103,9 @@ const mstp = (state: AppState, props: OwnProps): StateProps => {
   return {variables, valuesStatus}
 }
 
-export default connect<StateProps, {}, OwnProps>(mstp)(VariablesControlBar)
+export default DragDropContext(HTML5Backend)(
+  connect<StateProps, DispatchProps, OwnProps>(
+    mstp,
+    mdtp
+  )(VariablesControlBar)
+)

ui/src/localStorage.ts

@@ -30,6 +30,7 @@ export const loadLocalStorage = (): LocalStorage => {
 export const saveToLocalStorage = ({
   app: {persisted},
   ranges,
+  variables,
 }: LocalStorage): void => {
   try {
     const appPersisted = {app: {persisted}}
@@ -39,6 +40,7 @@ export const saveToLocalStorage = ({
         ...appPersisted,
         VERSION,
         ranges: normalizer(ranges),
+        variables,
       })
     )
   } catch (err) {

ui/src/mockState.tsx

@@ -3,6 +3,7 @@ import {Provider} from 'react-redux'
 import {Router, createMemoryHistory} from 'react-router'
 
 import {render} from 'react-testing-library'
+import {initialState} from 'src/variables/reducers'
 import configureStore from 'src/store/configureStore'
 
 const localState = {
@@ -24,6 +25,7 @@ const localState = {
       duration: '15m',
     },
   ],
+  variables: initialState(),
 }
 
 const history = createMemoryHistory({entries: ['/']})

ui/src/types/localStorage.ts

@@ -1,7 +1,9 @@
 import {AppState} from 'src/shared/reducers/app'
+import {VariablesState} from 'src/variables/reducers'
 
 export interface LocalStorage {
   VERSION: string
   app: AppState
   ranges: any[]
+  variables: VariablesState
 }

ui/src/variables/actions/index.ts

@@ -28,6 +28,7 @@ export type Action =
   | SetVariables
   | SetVariable
   | RemoveVariable
+  | MoveVariable
   | SetValues
   | SelectValue
 
@@ -75,6 +76,20 @@ const removeVariable = (id: string): RemoveVariable => ({
   payload: {id},
 })
 
+interface MoveVariable {
+  type: 'MOVE_VARIABLE'
+  payload: {originalIndex: number; newIndex: number; contextID: string}
+}
+
+export const moveVariable = (
+  originalIndex: number,
+  newIndex: number,
+  contextID: string
+): MoveVariable => ({
+  type: 'MOVE_VARIABLE',
+  payload: {originalIndex, newIndex, contextID},
+})
+
 interface SetValues {
   type: 'SET_VARIABLE_VALUES'
   payload: {