From 458b2822c35ae1039dff74a41adc119e743dd26d Mon Sep 17 00:00:00 2001
From: "Mazzella, Jesse D. (ARC-TI)[KBR Wyle Services, LLC]"
 <jesse.d.mazzella@nasa.gov>
Date: Thu, 25 Jan 2024 17:14:24 -0800
Subject: [PATCH] feat(WIP): add composables and dynamically calculate popup
 position

---
 .../components/UserIndicator.vue              | 50 +++++++-----
 src/ui/composables/event.js                   | 77 +++++++++++++++++++
 src/ui/composables/resize.js                  | 68 ++++++++++++++++
 3 files changed, 176 insertions(+), 19 deletions(-)
 create mode 100644 src/ui/composables/event.js
 create mode 100644 src/ui/composables/resize.js

diff --git a/src/plugins/userIndicator/components/UserIndicator.vue b/src/plugins/userIndicator/components/UserIndicator.vue
index 9ed8254133..9c113e98be 100644
--- a/src/plugins/userIndicator/components/UserIndicator.vue
+++ b/src/plugins/userIndicator/components/UserIndicator.vue
@@ -36,14 +36,15 @@
     </span>
   </div>
   <Teleport to="body">
-    <div v-if="isPopupVisible" class="c-user-control-panel">
-      <MissionStatusPopup v-if="canSetMissionStatus" />
+    <div v-show="isPopupVisible" ref="popup" class="c-user-control-panel" :style="popupStyle">
+      <MissionStatusPopup v-show="canSetMissionStatus" />
     </div>
   </Teleport>
 </template>
 
 <script>
 import ActiveRoleSynchronizer from '../../../api/user/ActiveRoleSynchronizer.js';
+import { useWindowResize } from '../../../ui/composables/resize.js';
 import MissionStatusPopup from './MissionStatusPopup.vue';
 
 export default {
@@ -53,6 +54,11 @@ export default {
   },
   inject: ['openmct'],
   inheritAttrs: false,
+  setup() {
+    const { windowSize } = useWindowResize();
+
+    return { windowSize };
+  },
   data() {
     return {
       userName: undefined,
@@ -66,35 +72,41 @@ export default {
     };
   },
   computed: {
+    popupStyle() {
+      return {
+        top: `${this.position.top}px`,
+        left: `${this.position.left}px`
+      };
+    },
     position() {
-      const indicator = this.$refs.userIndicator;
-      if (!indicator) {
-        return {
-          top: 0,
-          left: 0
-        };
+      if (!this.isPopupVisible) {
+        return { top: 0, left: 0 };
       }
+      const indicator = this.$refs.userIndicator;
       const indicatorRect = indicator.getBoundingClientRect();
-      const popup = this.$refs.popup;
       let top = indicatorRect.bottom;
       let left = indicatorRect.left;
-      if (popup) {
-        const popupRect = popup.getBoundingClientRect();
-        top += popupRect.height;
-        left += indicatorRect.width + popupRect.width;
+
+      const popupRect = this.$refs.popup.getBoundingClientRect();
+      const popupWidth = popupRect.width;
+      const popupHeight = popupRect.height;
+
+      // Check if the popup goes beyond the right edge of the window
+      if (left + popupWidth > this.windowSize.width) {
+        left = this.windowSize.width - popupWidth; // Adjust left to fit within the window
       }
 
-      return {
-        top,
-        left
-      };
+      // Check if the popup goes beyond the bottom edge of the window
+      if (top + popupHeight > this.windowSize.height) {
+        top = indicatorRect.top - popupHeight; // Place popup above the indicator
+      }
+
+      return { top, left };
     }
   },
-
   async created() {
     await this.getUserInfo();
   },
-
   mounted() {
     // need to wait for openmct to be loaded before using openmct.overlays.selection
     // as document.body could be null
diff --git a/src/ui/composables/event.js b/src/ui/composables/event.js
new file mode 100644
index 0000000000..771505c741
--- /dev/null
+++ b/src/ui/composables/event.js
@@ -0,0 +1,77 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+/* eslint-disable func-style */
+
+import { isRef, onBeforeMount, onBeforeUnmount, onMounted, watch } from 'vue';
+
+/**
+ * Registers an event listener on the specified target and automatically removes it when the
+ * component is unmounted.
+ * This is a Vue composition API utility function.
+ * @param {EventTarget} target - The target to attach the event listener to.
+ * @param {string} event - The name of the event to listen for.
+ * @param {Function} callback - The callback function to execute when the event is triggered.
+ */
+export function useEventListener(target, event, handler) {
+  const addListener = (el) => {
+    if (el) {
+      el.addEventListener(event, handler);
+    }
+  };
+
+  const removeListener = (el) => {
+    if (el) {
+      el.removeEventListener(event, handler);
+    }
+  };
+
+  // If target is a reactive ref, watch it for changes
+  if (isRef(target)) {
+    watch(
+      target,
+      (newTarget, oldTarget) => {
+        if (newTarget !== oldTarget) {
+          removeListener(oldTarget);
+          addListener(newTarget);
+        }
+      },
+      { immediate: true }
+    );
+  } else {
+    // Otherwise use lifecycle hooks to add/remove listener
+    onMounted(() => addListener(target));
+    onBeforeUnmount(() => removeListener(target));
+  }
+}
+
+/**
+ * Registers an event listener on the specified EventEmitter instance and automatically removes it
+ * when the component is unmounted.
+ * This is a Vue composition API utility function.
+ * @param {import('eventemitter3').EventEmitter} emitter - The EventEmitter instance to attach the event listener to.
+ * @param {string} event - The name of the event to listen for.
+ * @param {Function} callback - The callback function to execute when the event is triggered.
+ */
+export function useEventEmitter(emitter, event, callback) {
+  onBeforeMount(() => emitter.on(event, callback));
+  onBeforeUnmount(() => emitter.off(event, callback));
+}
diff --git a/src/ui/composables/resize.js b/src/ui/composables/resize.js
new file mode 100644
index 0000000000..0e744cdcfc
--- /dev/null
+++ b/src/ui/composables/resize.js
@@ -0,0 +1,68 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+/* eslint-disable func-style */
+import { onBeforeUnmount, reactive } from 'vue';
+
+import throttle from '../../utils/throttle.js';
+import { useEventListener } from './event.js';
+
+export function useResizeObserver() {
+  const size = reactive({ width: 0, height: 0 });
+  let observer;
+
+  const startObserving = (element) => {
+    if (!element) {
+      return;
+    }
+
+    observer = new ResizeObserver((entries) => {
+      if (entries[0]) {
+        const { width, height } = entries[0].contentRect;
+        size.width = width;
+        size.height = height;
+      }
+    });
+
+    observer.observe(element);
+  };
+
+  onBeforeUnmount(() => {
+    if (observer) {
+      observer.disconnect();
+    }
+  });
+
+  return { size, startObserving };
+}
+
+export function useWindowResize() {
+  const windowSize = reactive({ width: window.innerWidth, height: window.innerHeight });
+
+  const handleResize = throttle(() => {
+    windowSize.width = window.innerWidth;
+    windowSize.height = window.innerHeight;
+  }, 100);
+
+  useEventListener(window, 'resize', handleResize);
+
+  return { windowSize };
+}