Use React Context API

src/components/App.js

@@ -21,6 +21,7 @@ import ControlMap from "components/ControlMap";
 import TopBar from "components/TopBar";
 import UiItemList from "components/UiItemList";
 
+import MqttContext from "mqtt/context";
 import connectMqtt from "../connectMqtt";
 
 export type AppProps = {
@@ -119,7 +120,6 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
       const val =
         transformValue == null ? value : transformValue(Buffer.from(value));
       this.state.mqttSend(rawTopic, Buffer.from(val));
-      throw new Error("test");
     } catch (err) {
       this.setState({ error: err.toString() });
     }
@@ -127,9 +127,12 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
 
   render() {
     return (
-      <div>
+      <MqttContext.Provider value={{
+        state: this.state.mqttState,
+        changeState: this.changeState.bind(this)
+      }}>
         <MuiThemeProvider theme={this.theme}>
-          <div>
+          <React.Fragment>
             <TopBar title={`${this.props.config.space.name} Map`}
               connected={this.state.mqttConnected} />
             <SideBar open={this.state.drawerOpened}
@@ -139,18 +142,14 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
                 this.state.selectedControl.icon(this.state.mqttState)}
             >
               {this.state.selectedControl == null
-                || <UiItemList state={this.state.mqttState}
-                  controls={this.state.selectedControl.ui}
-                  onChangeState={this.changeState.bind(this)}
-                />}
+                || <UiItemList controls={this.state.selectedControl.ui} />}
             </SideBar>
-          </div>
+          </React.Fragment>
         </MuiThemeProvider>
         <ControlMap width={1000} height={700} zoom={0}
           layers={this.props.config.layers}
           controls={this.props.config.controls}
           onChangeControl={this.changeControl.bind(this)}
-          state={this.state.mqttState}
         />
         <Snackbar
           anchorOrigin={{
@@ -176,7 +175,7 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
               <i className="mdi mdi-close" />
             </IconButton>
           } />
-      </div>
+      </MqttContext.Provider>
     );
   }
 }

src/components/ControlMap.js

@@ -3,7 +3,7 @@ import React from "react";
 import { Map, ImageOverlay, Marker, LayersControl } from "react-leaflet";
 import { CRS, point, divIcon } from "leaflet";
 import map from "lodash/map";
-
+import MqttContext from "mqtt/context";
 import type { Controls, Control } from "config/flowtypes";
 
 export type Point = [number, number];
@@ -16,8 +16,7 @@ export type ControlMapProps = {
   zoom: number,
   layers: Array<Layer>,
   controls: Controls,
-  onChangeControl: (control: Control) => void,
-  state: State
+  onChangeControl: (control: Control) => void
 };
 
 export default class ControlMap extends React.PureComponent<ControlMapProps> {
@@ -48,32 +47,36 @@ export default class ControlMap extends React.PureComponent<ControlMapProps> {
     return map(this.props.controls, this.renderMarker.bind(this));
   }
 
-  createLeafletIcon(control: Control) {
-    const icon = control.icon(this.props.state);
+  createLeafletIcon(control: Control, state: State) {
+    const icon = control.icon(state);
     const iconClass = `${icon} mdi-36px`;
     return divIcon({
       iconSize: point(36, 36),
       iconAnchor: point(18, 18),
       html: `<i class="${iconClass}"
-          style="line-height: 1; color: ${this.iconColor(control)}"></i>`
+          style="line-height: 1; color: ${this.iconColor(control, state)}"></i>`
     });
   }
 
-  iconColor(control: Control): string {
+  iconColor(control: Control, state: State): string {
     if (control.iconColor != null) {
-      return control.iconColor(this.props.state);
+      return control.iconColor(state);
     }
     return "#000";
   }
 
   renderMarker(control: Control, key: string) {
     return (
+      <MqttContext.Consumer>
+        {({ state }) => (
           <Marker position={convertPoint(control.position)}
             key={key}
-        icon={this.createLeafletIcon(control)}
+            icon={this.createLeafletIcon(control, state)}
             onClick={() => this.props.onChangeControl(control)}
           >
           </Marker>
+        )}
+      </MqttContext.Consumer>
     );
   }
 

src/components/SideBar.js

@@ -8,7 +8,7 @@ import IconButton from "@material-ui/core/IconButton";
 import AppBar from "@material-ui/core/AppBar";
 import Toolbar from "@material-ui/core/Toolbar";
 import List from "@material-ui/core/List";
-import { renderIcon } from "config/icon";
+import { renderRawIcon } from "config/icon";
 
 import type { RawIcon } from "config/icon";
 import type { Control } from "config/flowtypes";
@@ -57,7 +57,7 @@ class SideBar extends React.PureComponent<Props, SideBarState> {
         <AppBar position="static">
           <Toolbar>
             <span>{this.props.icon == null
-              || renderIcon(this.props.icon, "mdi-36px")}</span>
+              || renderRawIcon(this.props.icon, "mdi-36px")}</span>
             <Typography variant="title" className={this.props.classes.flex}>
               {this.props.control == null ? "" : this.props.control.name}
             </Typography>

src/components/UiItemList/UiItem.js

@@ -3,7 +3,7 @@ import React from "react";
 import keys from "lodash/keys";
 import map from "lodash/map";
 import debounce from "lodash/debounce";
-import { renderIcon } from "config/icon";
+import { renderRawIcon } from "config/icon";
 import ListItemSecondaryAction from "@material-ui/core/ListItemSecondaryAction";
 import ListItemText from "@material-ui/core/ListItemText";
 import ListSubheader from "@material-ui/core/ListSubheader";
@@ -218,7 +218,7 @@ export class Link extends UiItem<UILink> {
         disabled={!this.isEnabled()}
       >
         {this.props.item.icon == null ? ""
-          : renderIcon(this.props.item.icon(this.props.state), "mdi-24px")}
+          : renderRawIcon(this.props.item.icon(this.props.state), "mdi-24px")}
         {this.props.item.text}
       </Button>
     );

src/components/UiItemList/index.js

@@ -2,17 +2,17 @@
 import React from "react";
 import ListItem from "@material-ui/core/ListItem";
 import ListItemIcon from "@material-ui/core/ListItemIcon";
-import { renderIcon } from "config/icon";
+import { renderRawIcon } from "config/icon";
 
 import type { ControlUI } from "config/flowtypes";
 
 import { Toggle, DropDown, Link,
   Section, Text, Progress, Slider } from "./UiItem";
+import MqttContext from "mqtt/context";
+import type { MqttContextValue } from "mqtt/context";
 
 export type UiItemListProps = {
-  controls: Array<ControlUI>,
-  state: State,
-  onChangeState: (topic: string, nextState: string) => void
+  controls: Array<ControlUI>
 };
 
 export default class UiItemList extends React.PureComponent<UiItemListProps> {
@@ -27,66 +27,60 @@ export default class UiItemList extends React.PureComponent<UiItemListProps> {
           "A control is missing the \"type\" parameter"
         );
       }
-      if (control.type === "section") {
-        return this.renderControl(control, key.toString());
-      }
       return (
         <ListItem key={key}>
-          <React.Fragment>
-            {control.icon == null || control.type === "link" ||
-              <ListItemIcon key={`${key.toString()}-liicon`}>
-                {renderIcon(control.icon(this.props.state), "mdi-24px")}
-              </ListItemIcon>}
-            {this.renderControl(control, key.toString())}
-          </React.Fragment>
+          <MqttContext.Consumer>
+            {this.renderListItem(control, key)}
+          </MqttContext.Consumer>
         </ListItem>
       );
     });
   }
 
-  renderControl(control: ControlUI, key: string) {
+  renderListItem(control: ControlUI, key: number) {
+    return (mqtt: MqttContextValue) => {
+      const node = this.renderControl(control, key.toString(), mqtt);
+      if (control.icon == null || control.type === "link"
+        || control.type === "section") {
+        return node;
+      } else {
+        const listIconNode = (
+          <ListItemIcon key={`${key.toString()}-liicon`}>
+            {renderRawIcon(control.icon(mqtt.state), "mdi-24px")}
+          </ListItemIcon>
+        );
+        return [listIconNode, node];
+      }
+    };
+  }
+
+  renderControl(control: ControlUI, key: string, mqtt: MqttContextValue) {
+    const props = {
+      state: mqtt.state,
+      onChangeState: mqtt.changeState,
+      key: `${key}-licontrol`
+    };
     switch (control.type) {
     case "toggle": {
-      return <Toggle item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Toggle item={control} {...props} />;
     }
     case "dropDown": {
-      return <DropDown item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <DropDown item={control} {...props} />;
     }
     case "section": {
-      return <Section item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Section item={control} {...props} />;
     }
     case "link": {
-      return <Link item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Link item={control} {...props} />;
     }
     case "slider": {
-      return <Slider item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Slider item={control} {...props} />;
     }
     case "text": {
-      return <Text item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Text item={control} {...props} />;
     }
     case "progress": {
-      return <Progress item={control}
-        state={this.props.state}
-        onChangeState={this.props.onChangeState}
-        key={`${key}-licontrol`} />;
+      return <Progress item={control} {...props} />;
     }
     default: {
       throw new Error(

src/config/icon.js

@@ -1,5 +1,6 @@
 // @flow
 import * as React from "react";
+import ReactContext from "mqtt/context";
 
 export opaque type RawIcon: string = string;
 
@@ -39,7 +40,16 @@ export const mdiBattery = (topic: string) => (state: State) => {
   }
 };
 
-export const renderIcon =
+export const renderRawIcon =
   (icon: RawIcon, extraClass?: string): React.Node => {
     return <i className={`${extraClass || ""} ${icon}`}></i>;
   };
+
+export const renderIcon =
+  (icon: Icon, extraClass?: string): React.Node => {
+    return (
+      <ReactContext.Consumer>
+        {({state}) => renderRawIcon(icon(state), extraClass)}
+      </ReactContext.Consumer>
+    );
+  };

src/mqtt/context.js

@@ -0,0 +1,12 @@
+// @flow
+import React from "react";
+
+export type MqttContextValue = {
+  state: State,
+  changeState: (topic: string, value: string) => void
+};
+
+export default React.createContext({
+  state: {},
+  changeState: (_topic, _val) => {}
+});