StyleBlock in elements dir

src/app/common/elements/index.tsx

@@ -18,3 +18,4 @@ export { Toggle } from "./toggle";
 export { Tooltip } from "./tooltip";
 export { TabIcon } from "./tabicon";
 export { DatePicker } from "./datepicker";
+export { StyleBlock } from "./styleblock";

src/app/common/elements/styleblock.tsx

@@ -0,0 +1,66 @@
+// Copyright 2023, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+import * as React from "react";
+import * as mobxReact from "mobx-react";
+import * as mobx from "mobx";
+import { GlobalModel } from "@/models";
+import { isBlank } from "@/util/util";
+
+@mobxReact.observer
+class StyleBlock extends React.Component<
+    { themeSrcEl: HTMLElement; themeKey: string; className: string; termTheme: TermThemeType },
+    { styleRules: string }
+> {
+    styleRules: OV<string> = mobx.observable.box("", { name: "StyleBlock-styleRules" });
+    theme: string;
+
+    componentDidMount(): void {
+        GlobalModel.termThemeSrcEl.set(this.props.themeSrcEl);
+        this.loadThemeStyles();
+    }
+
+    componentDidUpdate(prevProps): void {
+        const { themeKey, termTheme } = this.props;
+        const currTheme = termTheme[themeKey];
+        if (themeKey !== prevProps.themeKey || currTheme !== this.theme) {
+            this.loadThemeStyles();
+        }
+        if (this.props.themeSrcEl !== prevProps.themeSrcEl) {
+            GlobalModel.termThemeSrcEl.set(this.props.themeSrcEl);
+        }
+    }
+
+    async loadThemeStyles() {
+        const { themeKey, className, termTheme } = this.props;
+        const currTheme = termTheme[themeKey];
+
+        if (currTheme !== this.theme && currTheme) {
+            const rtn = GlobalModel.getTermThemeJson(currTheme);
+            rtn.then((termThemeJson) => {
+                if (termThemeJson && typeof termThemeJson === "object") {
+                    const styleProperties = Object.entries(termThemeJson)
+                        .map(([key, value]) => `--term-${key}: ${value};`)
+                        .join(" ");
+
+                    this.styleRules.set(`.${className} { ${styleProperties} }`);
+                    GlobalModel.bumpTermRenderVersion();
+                    this.theme = currTheme;
+                } else {
+                    console.error("termThemeJson is not an object:", termThemeJson);
+                }
+            }).catch((error) => {
+                console.error("error loading theme styles:", error);
+            });
+        }
+    }
+
+    render() {
+        if (isBlank(this.styleRules.get())) {
+            return null;
+        }
+        return <style>{this.styleRules.get()}</style>;
+    }
+}
+
+export { StyleBlock };