show dom elements in value explorer

docs/examples/plot/index.js

@@ -0,0 +1,16 @@
+import _ from 'https://unpkg.com/lodash-es'
+
+const url = 'https://api.github.com/search/repositories?q=stars:%3E1&sort=stars'
+const resp = await fetch(url)
+const repos = await resp.json()
+const langs = _(repos.items)
+  .map(r => r.language)
+  .filter(l => l != null)
+  .countBy()
+  .toPairs()
+  .map(([language, count]) => ({language, count}))
+
+import {barY} from "https://cdn.jsdelivr.net/npm/@observablehq/plot@0.6/+esm";
+
+barY(langs, {x: "language", y: "count", sort: {x: "y", reverse: true}, fill: 'purple'})
+  .plot()

index.html

@@ -266,16 +266,23 @@
 
       /* value_explorer */
 
-      .embed_value_explorer_container {
+      .embed_value_explorer_container.is_not_dom_el {
         height: 0px;
       }
 
+      .embed_value_explorer_container.is_dom_el {
+        padding: 1em;
+      }
+
       .embed_value_explorer_wrapper {
-        margin-left: 1em;
         /* preserve wrapper from getting clicks for code line left to it */
         pointer-events: none; 
       }
 
+      .embed_value_explorer_container.is_not_dom_el .embed_value_explorer_wrapper {
+        margin-left: 1em;
+      }
+
       .embed_value_explorer_content {
         pointer-events: initial;
         white-space: pre;

src/editor/editor.js

@@ -169,10 +169,33 @@ export class Editor {
   }
 
   unembed_value_explorer() {
-    if(this.widget != null) {
+    if(this.widget == null) {
-      this.ace_editor.getSession().widgetManager.removeLineWidget(this.widget) 
+      return
-      this.widget = null
     }
+
+    const session = this.ace_editor.getSession()
+    const widget_bottom = this.widget.el.getBoundingClientRect().bottom
+    session.widgetManager.removeLineWidget(this.widget) 
+
+    if(this.widget.is_dom_el) {
+      /*
+        if cursor moves below widget, then ace editor first adjusts scroll,
+        and then widget gets remove, so scroll jerks. We have to set scroll
+        back
+      */
+      // distance travelled by cursor
+      const distance = session.selection.getCursor().row - this.widget.row
+      if(distance > 0) {
+        const line_height = this.ace_editor.renderer.lineHeight
+        const scroll = widget_bottom - this.editor_container.getBoundingClientRect().bottom
+        if(scroll > 0) {
+          const scrollTop = session.getScrollTop()
+          session.setScrollTop(session.getScrollTop() - scroll - line_height*distance)
+        }
+      }
+    }
+
+    this.widget = null
   }
 
   update_value_explorer_margin() {
@@ -203,10 +226,6 @@ export class Editor {
     this.unembed_value_explorer()
 
     const session = this.ace_editor.getSession()
-    const pos = session.doc.indexToPosition(index)
-    const row = pos.row
-
-    const line_height = this.ace_editor.renderer.lineHeight
 
     let content
     const container = el('div', {'class': 'embed_value_explorer_container'},
@@ -214,7 +233,6 @@ export class Editor {
         content = el('div', {
           // Ace editor cannot render widget before the first line. So we
           // render in on the next line and apply translate
-          'style': `transform: translate(0px, -${line_height}px)`,
           'class': 'embed_value_explorer_content', 
           tabindex: 0
         })
@@ -242,7 +260,14 @@ export class Editor {
       }
     })
 
+    let is_dom_el
+
     if(ok) {
+      if(value instanceof globalThis.app_window.Element && !value.isConnected) {
+        is_dom_el = true
+        content.appendChild(value)
+      } else {
+        is_dom_el = false
         const exp = new ValueExplorer({
           container: content,
           event_target: container,
@@ -264,15 +289,20 @@ export class Editor {
         })
 
         exp.render(value)
+      }
     } else {
+      is_dom_el = false
       content.appendChild(el('span', 'eval_error', stringify_for_header(error)))
     }
 
     const widget = this.widget = {
-       row,
+       row: is_dom_el
+        ? session.doc.indexToPosition(index + length).row
+        : session.doc.indexToPosition(index).row,
        fixedWidth: true,
        el: container,
        content,
+       is_dom_el,
      }
 
 
@@ -282,6 +312,13 @@ export class Editor {
       session.widgetManager.attach(this.ace_editor);
     }
 
+    if(is_dom_el) {
+      container.classList.add('is_dom_el')
+      session.widgetManager.addLineWidget(widget) 
+    } else {
+      container.classList.add('is_not_dom_el')
+      const line_height = this.ace_editor.renderer.lineHeight
+      content.style.transform = `translate(0px, -${line_height}px)`
       // update_value_explorer_margin relies on getLastVisibleRow which can be
       // incorrect because it may be executed right after set_cursor_position
       // which is async in ace_editor. Use setTimeout
@@ -291,6 +328,8 @@ export class Editor {
       }, 0)
     }
 
+  }
+
   focus_value_explorer(return_to) {
     if(this.widget != null) {
       this.widget.return_to = return_to

src/examples.js

@@ -27,6 +27,10 @@ export const examples = [
     path: 'ethers',
     entrypoint: 'ethers/block_by_timestamp.js',
   },
+  {
+    path: 'plot',
+    entrypoint: 'plot/index.js',
+  },
 ].map(e => ({...e, entrypoint: e.entrypoint ?? e.path}))
 
 const files_list = examples