Ensure overlay plot styles work inside a stacked plot

src/plugins/plot/stackedPlot/StackedPlotItem.vue

@@ -26,8 +26,10 @@
 
 import MctPlot from '../MctPlot.vue';
 import Vue from "vue";
+import conditionalStylesMixin from "./mixins/objectStyles-mixin";
 
 export default {
+    mixins: [conditionalStylesMixin],
     inject: ['openmct', 'domainObject', 'path'],
     props: {
         object: {

src/plugins/plot/stackedPlot/mixins/objectStyles-mixin.js

@@ -0,0 +1,143 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2022, 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.
+ *****************************************************************************/
+
+import StyleRuleManager from "@/plugins/condition/StyleRuleManager";
+import {STYLE_CONSTANTS} from "@/plugins/condition/utils/constants";
+
+export default {
+    inject: ['openmct', 'domainObject', 'path'],
+    data() {
+        return {
+            objectStyle: undefined
+        };
+    },
+    mounted() {
+        this.objectStyles = this.getObjectStyleForItem(this.object.configuration);
+        this.initObjectStyles();
+    },
+    beforeDestroy() {
+        if (this.stopListeningStyles) {
+            this.stopListeningStyles();
+        }
+
+        if (this.styleRuleManager) {
+            this.styleRuleManager.destroy();
+        }
+    },
+    methods: {
+        getObjectStyleForItem(config) {
+            if (config && config.objectStyles) {
+                return config.objectStyles ? Object.assign({}, config.objectStyles) : undefined;
+            } else {
+                return undefined;
+            }
+        },
+        initObjectStyles() {
+            if (!this.styleRuleManager) {
+                this.styleRuleManager = new StyleRuleManager(this.objectStyles, this.openmct, this.updateStyle.bind(this), true);
+            } else {
+                this.styleRuleManager.updateObjectStyleConfig(this.objectStyles);
+            }
+
+            if (this.stopListeningStyles) {
+                this.stopListeningStyles();
+            }
+
+            this.stopListeningStyles = this.openmct.objects.observe(this.object, 'configuration.objectStyles', (newObjectStyle) => {
+                //Updating styles in the inspector view will trigger this so that the changes are reflected immediately
+                this.styleRuleManager.updateObjectStyleConfig(newObjectStyle);
+            });
+
+            if (this.object && this.object.configuration && this.object.configuration.fontStyle) {
+                const { fontSize, font } = this.object.configuration.fontStyle;
+                this.setFontSize(fontSize);
+                this.setFont(font);
+            }
+
+            this.stopListeningFontStyles = this.openmct.objects.observe(this.object, 'configuration.fontStyle', (newFontStyle) => {
+                this.setFontSize(newFontStyle.fontSize);
+                this.setFont(newFontStyle.font);
+            });
+        },
+        getStyleReceiver() {
+            let styleReceiver;
+
+            if (this.$el !== undefined) {
+                styleReceiver = this.$el.querySelector('.js-style-receiver')
+                    || this.$el.querySelector(':first-child');
+
+                if (styleReceiver === null) {
+                    styleReceiver = undefined;
+                }
+            }
+
+            return styleReceiver;
+        },
+        setFontSize(newSize) {
+            let elemToStyle = this.getStyleReceiver();
+
+            if (elemToStyle !== undefined) {
+                elemToStyle.dataset.fontSize = newSize;
+            }
+        },
+        setFont(newFont) {
+            let elemToStyle = this.getStyleReceiver();
+
+            if (elemToStyle !== undefined) {
+                elemToStyle.dataset.font = newFont;
+            }
+        },
+        updateStyle(styleObj) {
+            let elemToStyle = this.getStyleReceiver();
+
+            if (!styleObj || elemToStyle === undefined) {
+                return;
+            }
+
+            let keys = Object.keys(styleObj);
+
+            keys.forEach(key => {
+                if (elemToStyle) {
+                    if ((typeof styleObj[key] === 'string') && (styleObj[key].indexOf('__no_value') > -1)) {
+                        if (elemToStyle.style[key]) {
+                            elemToStyle.style[key] = '';
+                        }
+                    } else {
+                        if (!styleObj.isStyleInvisible && elemToStyle.classList.contains(STYLE_CONSTANTS.isStyleInvisible)) {
+                            elemToStyle.classList.remove(STYLE_CONSTANTS.isStyleInvisible);
+                        } else if (styleObj.isStyleInvisible && !elemToStyle.classList.contains(styleObj.isStyleInvisible)) {
+                            elemToStyle.classList.add(styleObj.isStyleInvisible);
+                        }
+
+                        elemToStyle.style[key] = styleObj[key];
+                    }
+                }
+            });
+
+            if (this.object && this.object.type === 'conditionWidget' && keys.includes('output')) {
+                this.openmct.objects.mutate(this.object, 'conditionalLabel', styleObj.output);
+            } else {
+                this.openmct.objects.mutate(this.object, 'conditionalLabel', '');
+            }
+        }
+    }
+};