ui_migration fix(deps): Replace component instance event by external event bus from mitt package.

webapp/src/App.vue

@@ -28,6 +28,7 @@ import loadingContent from "./components/loadingContent.vue";
 import MouseTrap from "mousetrap";
 // vue3 migration
 import { markRaw } from "vue";
+import { eventBus } from "./eventBus.js";
 
 MouseTrap.prototype.stopCallback = function (e, element) {
   // if the element has the class "mousetrap" then no need to stop
@@ -153,10 +154,10 @@ export default {
 
     // Focus keys
     Mousetrap.bind("pageup", () => {
-      this.$root.$emit("globalMoveStepEvent", 0, 0, 1);
+      eventBus.emit("globalMoveStepEvent", 0, 0, 1);
     });
     Mousetrap.bind("pagedown", () => {
-      this.$root.$emit("globalMoveStepEvent", 0, 0, -1);
+      eventBus.emit("globalMoveStepEvent", 0, 0, -1);
     });
     this.keyboardManual.push({
       shortcut: "pgup / pgdn",
@@ -165,7 +166,7 @@ export default {
 
     // Capture
     Mousetrap.bind("c", () => {
-      this.$root.$emit("globalCaptureEvent");
+      eventBus.emit("globalCaptureEvent");
     });
     this.keyboardManual.push({
       shortcut: "c",
@@ -174,7 +175,7 @@ export default {
 
     // Autofocus
     Mousetrap.bind("a", () => {
-      this.$root.$emit("globalFastAutofocusEvent");
+      eventBus.emit("globalFastAutofocusEvent");
     });
     this.keyboardManual.push({
       shortcut: "a",
@@ -183,10 +184,10 @@ export default {
 
     // Increment/decrement tab
     Mousetrap.bind("shift+down", () => {
-      this.$root.$emit("globalIncrementTab");
+      eventBus.emit("globalIncrementTab");
     });
     Mousetrap.bind("shift+up", () => {
-      this.$root.$emit("globalDecrementTab");
+      eventBus.emit("globalDecrementTab");
     });
     this.keyboardManual.push({
       shortcut: "shift+↑ / shift+↓",
@@ -237,7 +238,7 @@ export default {
       }
     },
     handleExit: function () {
-      this.$root.$emit("globalTogglePreview", false);
+      eventBus.emit("globalTogglePreview", false);
     },
 
     // Handle global mouse wheel events to be associated with navigation
@@ -249,7 +250,7 @@ export default {
       ) {
         var z_rel = event.deltaY / 100;
         // Emit a signal to move, acted on by panelControl.vue
-        this.$root.$emit("globalMoveStepEvent", 0, 0, z_rel, false);
+        eventBus.emit("globalMoveStepEvent", 0, 0, z_rel, false);
       }
     },
 
@@ -276,7 +277,7 @@ export default {
       }
       // Make a position request
       // Emit a signal to move, acted on by panelControl.vue
-      this.$root.$emit("globalMoveStepEvent", x_rel, y_rel, z_rel);
+      eventBus.emit("globalMoveStepEvent", x_rel, y_rel, z_rel);
     },
   },
 };

webapp/src/components/appContent.vue

@@ -92,6 +92,7 @@ import slideScanContent from "./tabContentComponents/slideScanContent.vue";
 import viewContent from "./tabContentComponents/viewContent.vue";
 // vue3 migration
 import { shallowRef, markRaw, ref } from 'vue'
+import { eventBus } from "../eventBus.js";
 
 // Import modal components for device initialisation
 import calibrationWizard from "./modalComponents/calibrationWizard.vue";
@@ -207,15 +208,15 @@ export default {
 
   mounted() {
     // A global signal listener to switch tab
-    this.$root.$on("globalSwitchTab", (tabID) => {
+    eventBus.on("globalSwitchTab", (tabID) => {
       this.currentTab = tabID;
     });
     // A global signal listener to increment tab
-    this.$root.$on("globalIncrementTab", () => {
+    eventBus.on("globalIncrementTab", () => {
       this.incrementTabBy(1);
     });
     // A global signal listener to decrement tab
-    this.$root.$on("globalDecrementTab", () => {
+    eventBus.on("globalDecrementTab", () => {
       this.incrementTabBy(-1);
     });
     if (this.$store.getters.ready) {

webapp/src/components/labThingsComponents/actionButton.vue

@@ -29,6 +29,7 @@
 import ActionProgressBar from "./actionProgressBar.vue";
 import ActionStatusModal from "./actionStatusModal.vue";
 import { markRaw } from "vue";
+import { eventBus } from "../../eventBus.js";
 
 export default {
   name: "ActionButton",
@@ -134,19 +135,19 @@ export default {
 
   watch: {
     progress(newval) {
-      this.$emit("update:progress", newval);
+      eventBus.emit("update:progress", newval);
     },
     taskStarted(newval) {
-      this.$emit("update:taskStarted", newval);
+      eventBus.emit("update:taskStarted", newval);
     },
     taskRunning(newval) {
-      this.$emit("update:taskRunning", newval);
+      eventBus.emit("update:taskRunning", newval);
     },
     log(newval) {
-      this.$emit("update:log", newval);
+      eventBus.emit("update:log", newval);
     },
     taskStatus(newval) {
-      this.$emit("update:taskStatus", newval);
+      eventBus.emit("update:taskStatus", newval);
     },
   },
 
@@ -157,7 +158,7 @@ export default {
     }
     // A global signal listener to perform the action
     if (this.submitOnEvent) {
-      this.$root.$on(this.submitOnEvent, () => {
+      eventBus.on(this.submitOnEvent, () => {
         if (this.isDisabled) return;
         // Bootstrap task if button is not disabled.
         this.bootstrapTask();
@@ -167,7 +168,11 @@ export default {
 
   beforeUnmount() {
     if (this.submitOnEvent) {
-      this.$root.$off(this.submitOnEvent);
+      eventBus.off(this.submitOnEvent, () => {
+        if (this.isDisabled) return;
+        // Bootstrap task if button is not disabled.
+        this.bootstrapTask();
+      });
     }
   },
 
@@ -203,7 +208,7 @@ export default {
       if (ongoingTask) {
         // There is a started task
         this.taskStarted = true;
-        this.$emit("taskStarted");
+        eventBus.emit("taskStarted");
         // Find its URL
         const taskUrl = ongoingTask.links.find((t) => t.rel == "self").href;
         this.startPollingTask(ongoingTask.id, taskUrl);
@@ -226,10 +231,10 @@ export default {
 
     async startTask() {
       // Starts a new Action task
-      this.$emit("submit", this.submitData);
+      eventBus.emit("submit", this.submitData);
       // Send a request to start a task
       this.taskStarted = true;
-      this.$emit("taskStarted");
+      eventBus.emit("taskStarted");
       let response;
       try {
         response = await this.invokeAction(
@@ -239,7 +244,7 @@ export default {
           false, // Stop invokeAction handling the error.
         );
       } catch (error) {
-        this.$emit("error", error);
+        eventBus.emit("error", error);
         this.onTaskEnd();
         return;
       }
@@ -257,7 +262,7 @@ export default {
       this.taskUrl = taskUrl;
       // Start the store polling TaskId for success
       this.taskRunning = true;
-      this.$emit("taskRunning", taskId);
+      eventBus.emit("taskRunning", taskId);
       this.pollUntilComplete(
         taskUrl,
         this.onPollingResponse,
@@ -271,17 +276,17 @@ export default {
         this.taskStatus = response.data.status;
         this.log = response.data.log;
         if (response.data.status == "completed") {
-          this.$emit("response", response.data);
-          this.$emit("completed", response.data.output);
+          eventBus.emit("response", response.data);
+          eventBus.emit("completed", response.data.output);
         } else if (response.data.status == "cancelled") {
-          this.$emit("cancelled", response.data);
+          eventBus.emit("cancelled", response.data);
           this.modalNotify(`The action '${this.submitLabel}' was cancelled.`);
         }
       }
       this.taskUrl = null;
       this.taskRunning = false;
       this.taskStarted = false;
-      this.$emit("finished");
+      eventBus.emit("finished");
     },
 
     onPollingResponse(response) {

webapp/src/components/labThingsComponents/actionStatusModal.vue

@@ -75,7 +75,7 @@ export default {
     },
     hide() {
       UIkit.modal(this.$refs.modal).hide();
-      this.$root.$emit("modalClosed");
+      eventBus.emit("modalClosed");
     },
   },
 };

webapp/src/components/tabContentComponents/controlComponents/autofocusControl.vue

@@ -40,7 +40,7 @@ export default {
     },
     afterAutofocus() {
       this.isAutofocusing = false;
-      this.$root.$emit("globalUpdatePositionEvent");
+      eventBus.emit("globalUpdatePositionEvent");
     },
   },
 };

webapp/src/components/tabContentComponents/controlComponents/positionControl.vue

@@ -63,6 +63,7 @@ import syncPropertyButton from "../../labThingsComponents/syncPropertyButton.vue
 import stageControlButtons from "./stageControlButtons.vue";
 // vue3 migration
 import { markRaw } from "vue";
+import { eventBus } from "../../../eventBus.js";
 
 export default {
   name: "PaneControl",
@@ -89,20 +90,20 @@ export default {
   async mounted() {
     let self = this;
     // A global signal listener to perform a move action
-    this.$root.$on("globalMoveEvent", self.move);
-    this.$root.$on("globalUpdatePositionEvent", self.updatePosition);
+    eventBus.on("globalMoveEvent", self.move);
+    eventBus.on("globalUpdatePositionEvent", self.updatePosition);
     // A global signal listener to perform a move action in pixels
-    this.$root.$on("globalMoveInImageCoordinatesEvent", (x, y, absolute) => {
+    eventBus.on("globalMoveInImageCoordinatesEvent", (x, y, absolute) => {
       this.moveInImageCoordinatesRequest(x, y, absolute);
     });
     // A global signal listener to perform a move in multiples of a step size
-    this.$root.$on("globalMoveStepEvent", (x_steps, y_steps, z_steps) => {
+    eventBus.on("globalMoveStepEvent", (x_steps, y_steps, z_steps) => {
       const navigationStepSize = this.$store.state.navigationStepSize;
       const navigationInvert = this.$store.state.navigationInvert;
       const x = x_steps * navigationStepSize.x * (navigationInvert.x ? -1 : 1);
       const y = y_steps * navigationStepSize.y * (navigationInvert.y ? -1 : 1);
       const z = z_steps * navigationStepSize.z * (navigationInvert.z ? -1 : 1);
-      this.$root.$emit("globalMoveEvent", x, y, z, false);
+      eventBus.emit("globalMoveEvent", x, y, z, false);
     });
     // Update the current position in text boxes
     await this.updatePosition();
@@ -110,10 +111,10 @@ export default {
 
   beforeUnmount() {
     // Remove global signal listener to perform a move action
-    this.$root.$off("globalMoveEvent");
-    this.$root.$off("globalMoveInImageCoordinatesEvent");
-    this.$root.$off("globalMoveStepEvent");
-    this.$root.$off("globalUpdatePositionEvent");
+    eventBus.off("globalMoveEvent");
+    eventBus.off("globalMoveInImageCoordinatesEvent");
+    eventBus.off("globalMoveStepEvent");
+    eventBus.off("globalUpdatePositionEvent");
   },
 
   methods: {

webapp/src/components/tabContentComponents/controlComponents/stageControlButtons.vue

@@ -41,7 +41,7 @@ export default {
   name: "StageControlButtons",
   methods: {
     move(x, y, z) {
-      this.$root.$emit("globalMoveStepEvent", x, y, z);
+      eventBus.emit("globalMoveStepEvent", x, y, z);
     },
   },
 };

webapp/src/components/tabContentComponents/scanListContent.vue

@@ -102,6 +102,7 @@ import scanCard from "./scanListComponents/scanCard.vue";
 import ScanViewerModal from "./scanListComponents/scanViewer.vue";
 // vue3 migration
 import { markRaw } from "vue";
+import { eventBus } from "../../eventBus.js";
 
 // Export main app
 export default {
@@ -150,10 +151,10 @@ export default {
     // Update on mount (does nothing if not connected)
     await this.updateScans();
     // A global signal listener to perform a gallery refresh
-    this.$root.$on("globalUpdateScans", () => {
+    eventBus.on("globalUpdateScans", () => {
       this.updateScans();
     });
-    this.$root.$on("modalClosed", () => {
+    eventBus.on("modalClosed", () => {
       // Handle the modal closed event here
       this.updateScans();
     });
@@ -179,13 +180,13 @@ export default {
 
   beforeUnmount() {
     // Remove global signal listener to perform a gallery refresh
-    this.$root.$off("globalUpdateScans");
+    eventBus.off("globalUpdateScans");
     // Then we call that function here to unwatch
     if (this.unwatchStoreFunction) {
       this.unwatchStoreFunction();
       this.unwatchStoreFunction = null;
     }
-    this.$root.$off("modalClosed"); // Clean up event listener
+    eventBus.off("modalClosed"); // Clean up event listener
   },
 
   methods: {

webapp/src/components/tabContentComponents/streamContent.vue

@@ -35,6 +35,9 @@
 </template>
 
 <script>
+// vue3 migration
+import { eventBus } from "../../eventBus.js";
+
 // Export main app
 export default {
   name: "StreamDisplay",
@@ -63,7 +66,7 @@ export default {
 
   mounted() {
     // A global signal listener to flash the stream element
-    this.$root.$on("globalFlashStream", () => {
+    eventBus.on("globalFlashStream", () => {
       this.flashStream();
     });
 
@@ -83,9 +86,9 @@ export default {
 
   beforeUnmount: function () {
     // Remove global signal listener to change the GPU preview state
-    this.$root.$off("globalTogglePreview");
+    eventBus.off("globalTogglePreview");
     // Remove global signal listener to flash the stream element
-    this.$root.$off("globalFlashStream");
+    eventBus.off("globalFlashStream");
     // Disconnect the size observer
     this.sizeObserver.disconnect();
     // Remove from the array of active streams
@@ -126,7 +129,7 @@ export default {
       let yRelative = (0.5 * event.target.offsetHeight - yCoordinate) * scale;
 
       // Emit a signal to move, acted on by paneControl.vue
-      this.$root.$emit("globalMoveInImageCoordinatesEvent", -xRelative, -yRelative);
+      eventBus.emit("globalMoveInImageCoordinatesEvent", -xRelative, -yRelative);
     },
 
     handleResize: function () {

webapp/src/eventBus.js

@@ -0,0 +1,3 @@
+import mitt from "mitt";
+
+export const eventBus = mitt();