From 548355e7d3578a86c9f365e9bf177278c9b3d59f Mon Sep 17 00:00:00 2001
From: megatron0000 <vitor_pimenta97@hotmail.com>
Date: Mon, 30 Oct 2023 14:33:17 -0400
Subject: [PATCH] Feat: shadow dom, fixes issue #889 (#890)

* feat: add `shadowRoot` option for grids inside a shadow DOM tree

* add shadow DOM example
---
 examples/example1a-shadow-dom.html | 111 +++++++++++++++++++++++++++++
 examples/index.html                |   1 +
 src/models/gridOption.interface.ts |   3 +
 src/slick.grid.ts                  |   8 +--
 4 files changed, 119 insertions(+), 4 deletions(-)
 create mode 100644 examples/example1a-shadow-dom.html
diff --git a/examples/example1a-shadow-dom.html b/examples/example1a-shadow-dom.html
new file mode 100644
index 00000000..0f35a870
--- /dev/null
+++ b/examples/example1a-shadow-dom.html
@@ -0,0 +1,111 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+  <link rel="shortcut icon" type="image/ico" href="favicon.ico" />
+  <title>SlickGrid example 1a: Basic grid inside a shadow DOM</title>
+  <link rel="stylesheet" href="../dist/styles/css/example-demo.css" type="text/css"/>
+</head>
+<body>
+<table width="100%">
+  <tr>
+    <td valign="top" width="50%">
+      <div id="host"></div>
+    </td>
+    <td valign="top">
+      <div>
+        <h2>
+          <a href="/examples/index.html" style="text-decoration: none; font-size: 22px">&#x2302;</a>
+          Demonstrates:
+        </h2>
+      </div>
+      <ul>
+        <li>how to load a grid inside a shadow DOM tree</li>
+      </ul>
+        <h2>View Source:</h2>
+        <ul>
+            <li><A href="https://github.com/6pac/SlickGrid/blob/master/examples/example1a-shadow-dom.html" target="_sourcewindow"> View the source for this example on Github</a></li>
+        </ul>
+    </td>
+  </tr>
+</table>
+
+<script src="https://cdn.jsdelivr.net/npm/sortablejs/Sortable.min.js"></script>
+<script src="sortable-cdn-fallback.js"></script>
+
+<script src="../dist/browser/slick.core.js"></script>
+<script src="../dist/browser/slick.interactions.js"></script>
+<script src="../dist/browser/slick.grid.js"></script>
+
+<script>
+  var grid;
+  var columns = [
+    {id: "title", name: "Title", field: "title"},
+    {id: "duration", name: "Duration", field: "duration"},
+    {id: "%", name: "% Complete", field: "percentComplete", width: 90 },
+    {id: "start", name: "Start", field: "start"},
+    {id: "finish", name: "Finish", field: "finish"},
+    {id: "effort-driven", name: "Effort Driven", field: "effortDriven", width: 90 }
+  ];
+
+  var data = [];
+  for (var i = 0; i < 500; i++) {
+    data[i] = {
+      title: "Task " + i,
+      duration: "5 days",
+      percentComplete: Math.round(Math.random() * 100),
+      start: "01/01/2009",
+      finish: "01/05/2009",
+      effortDriven: (i % 5 == 0)
+    };
+  }
+
+  /**
+   * Build the shadow DOM. In this example, it will
+   * have just a div for the grid, and a <link>
+   * for the Alpine style.
+   * 
+   * Notice that the <link> tag must be placed inside
+   * the shadow DOM tree, it cannot be placed on the <head>
+   * tag because the shadow DOM is unaffected by external
+   * styles
+   */
+
+  var host = document.querySelector("#host");
+  var shadow = host.attachShadow({ mode: "open" });
+  var gridContainer = document.createElement("div");
+  gridContainer.style.width = "600px";
+  gridContainer.style.height = "500px";
+  gridContainer.classList.add("slick-container");
+  shadow.appendChild(gridContainer);
+
+  var linkElement = document.createElement("link");
+  linkElement.type = "text/css";
+  linkElement.rel = "stylesheet";
+  linkElement.href = "../dist/styles/css/slick-alpine-theme.css";
+  shadow.appendChild(linkElement);
+
+  /**
+   * Since the grid is inside a shadow DOM tree, we have
+   * to pass the root of this tree to the option `shadowRoot`
+   */
+
+  var options = {
+    enableCellNavigation: true,
+    enableColumnReorder: false,
+    shadowRoot: shadow
+  };
+
+  /**
+   * Since the <link> tag was loaded dynamically, it will take
+   * some time to download the referenced css file. We must
+   * wait for the style to finish loading, otherwise Slick.Grid
+   * will break
+   */
+
+  linkElement.addEventListener("load", () => {
+    grid = new Slick.Grid(gridContainer, data, columns, options);
+  })
+</script>
+</body>
+</html>
diff --git a/examples/index.html b/examples/index.html
index 049e75d9..393a1a7b 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -52,6 +52,7 @@ <h2>Basic Use</h2>
   <div>
     <ul>
       <li><a href="./example1-simple.html">Basic use with minimal configuration</a></li>
+      <li><a href="./example1a-shadow-dom.html">Basic use within a shadow DOM tree</a></li>
       <li><a href="./example2-formatters.html">Adding some formatting</a></li>
       <li><a href="./example7-events.html">Handling events and context menu</a></li>
       <li><a href="./example14-highlighting.html">Highlighting and flashing cells</a></li>
diff --git a/src/models/gridOption.interface.ts b/src/models/gridOption.interface.ts
index 345471cb..da9bfa6e 100644
--- a/src/models/gridOption.interface.ts
+++ b/src/models/gridOption.interface.ts
@@ -269,6 +269,9 @@ export interface GridOption<C extends BaseColumn = BaseColumn> {
   /** Defaults to true, which leads to render a separate span for the number and styles it with css class <i>slick-sort-indicator-numbered</i> */
   sortColNumberInSeparateSpan?: boolean;
 
+  /** Defaults to undefined. If we are inside a shadow DOM tree, this must be the shadow root of the tree */
+  shadowRoot?: ShadowRoot
+
   /**
    * Defaults to false, which leads to suppress the cell from becoming active when cell as an editor and is clicked.
    * This flag was originally enabled to work properly with (Row Selections & Inline Editors) features but it caused problem when also used with CellExternalCopyManager,
diff --git a/src/slick.grid.ts b/src/slick.grid.ts
index 3de91da2..b291f408 100644
--- a/src/slick.grid.ts
+++ b/src/slick.grid.ts
@@ -278,7 +278,8 @@ export class SlickGrid<TData = any, C extends Column<TData> = Column<TData>, O e
     maxSupportedCssHeight: 1000000000,
     sanitizer: undefined,  // sanitize function, built in basic sanitizer is: Slick.RegexSanitizer(dirtyHtml)
     logSanitizedHtml: false, // log to console when sanitised - recommend true for testing of dev and production
-    mixinDefaults: true
+    mixinDefaults: true,
+    shadowRoot: undefined
   };
 
   protected _columnDefaults = {
@@ -2303,8 +2304,7 @@ export class SlickGrid<TData = any, C extends Column<TData> = Column<TData>, O e
   protected createCssRules() {
     this._style = document.createElement('style');
     this._style.nonce = 'random-string';
-    document.head.appendChild(this._style);
-
+    (this._options.shadowRoot || document.head).appendChild(this._style);
     const sheet = this._style.sheet;
     if (sheet) {
       const rowHeight = (this._options.rowHeight! - this.cellHeightDiff);
@@ -2329,7 +2329,7 @@ export class SlickGrid<TData = any, C extends Column<TData> = Column<TData>, O e
   protected getColumnCssRules(idx: number) {
     let i: number;
     if (!this.stylesheet) {
-      const sheets: any = document.styleSheets;
+      const sheets: any = (this._options.shadowRoot || document).styleSheets;
       for (i = 0; i < sheets.length; i++) {
         if ((sheets[i].ownerNode || sheets[i].owningElement) === this._style) {
           this.stylesheet = sheets[i];
