[ENG-869] Key figure

apps/obsidian/src/components/NodeTypeSettings.tsx

@@ -32,7 +32,7 @@ type BaseFieldConfig = {
   label: string;
   description: string;
   required?: boolean;
-  type: "text" | "select" | "color";
+  type: "text" | "select" | "color" | "boolean";
   placeholder?: string;
   validate?: (
     value: string,
@@ -116,10 +116,32 @@ const FIELD_CONFIGS: Record<EditableFieldKey, BaseFieldConfig> = {
       return { isValid: true };
     },
   },
+  keyImage: {
+    key: "keyImage",
+    label: "Key image (first image from file)",
+    description:
+      "When enabled, canvas nodes of this type will show the first image from the linked file",
+    type: "boolean",
+    required: false,
+  },
 };
 
 const FIELD_CONFIG_ARRAY = Object.values(FIELD_CONFIGS);
 
+const BooleanField = ({
+  value,
+  onChange,
+}: {
+  value: boolean;
+  onChange: (value: boolean) => void;
+}) => (
+  <input
+    type="checkbox"
+    checked={!!value}
+    onChange={(e) => onChange((e.target as HTMLInputElement).checked)}
+  />
+);
+
 const TextField = ({
   fieldConfig,
   value,
@@ -297,12 +319,14 @@ const NodeTypeSettings = () => {
 
   const handleNodeTypeChange = (
     field: EditableFieldKey,
-    value: string,
+    value: string | boolean,
   ): void => {
     if (!editingNodeType) return;
 
     const updatedNodeType = { ...editingNodeType, [field]: value };
-    validateField(field, value, updatedNodeType);
+    if (typeof value === "string") {
+      validateField(field, value, updatedNodeType);
+    }
     setEditingNodeType(updatedNodeType);
     setHasUnsavedChanges(true);
   };
@@ -434,9 +458,9 @@ const NodeTypeSettings = () => {
   const renderField = (fieldConfig: BaseFieldConfig) => {
     if (!editingNodeType) return null;
 
-    const value = editingNodeType[fieldConfig.key] as string;
+    const value = editingNodeType[fieldConfig.key] as string | boolean;
     const error = errors[fieldConfig.key];
-    const handleChange = (newValue: string) =>
+    const handleChange = (newValue: string | boolean) =>
       handleNodeTypeChange(fieldConfig.key, newValue);
 
     return (
@@ -447,18 +471,24 @@ const NodeTypeSettings = () => {
       >
         {fieldConfig.key === "template" ? (
           <TemplateField
-            value={value}
+            value={value as string}
             error={error}
             onChange={handleChange}
             templateConfig={templateConfig}
             templateFiles={templateFiles}
           />
         ) : fieldConfig.type === "color" ? (
-          <ColorField value={value} error={error} onChange={handleChange} />
+          <ColorField
+            value={value as string}
+            error={error}
+            onChange={handleChange}
+          />
+        ) : fieldConfig.type === "boolean" ? (
+          <BooleanField value={value as boolean} onChange={handleChange} />
         ) : (
           <TextField
             fieldConfig={fieldConfig}
-            value={value}
+            value={value as string}
             error={error}
             onChange={handleChange}
             nodeType={editingNodeType}

apps/obsidian/src/components/canvas/ExistingNodeSearch.tsx

@@ -5,7 +5,12 @@ import DiscourseGraphPlugin from "~/index";
 import { QueryEngine } from "~/services/QueryEngine";
 import SearchBar from "~/components/SearchBar";
 import { addWikilinkBlockrefForFile } from "./stores/assetStore";
-import { getFrontmatterForFile } from "./shapes/discourseNodeShapeUtils";
+import {
+  getFirstImageSrcForFile,
+  getFrontmatterForFile,
+} from "./shapes/discourseNodeShapeUtils";
+import { DiscourseNode } from "~/types";
+import { calcDiscourseNodeSize } from "~/utils/calcDiscourseNodeSize";
 
 export const ExistingNodeSearch = ({
   plugin,
@@ -50,18 +55,45 @@ export const ExistingNodeSearch = ({
             canvasFile,
             linkedFile: file,
           });
+          const fmNodeTypeId = getFrontmatterForFile(plugin.app, file)
+            ?.nodeTypeId as string | undefined;
+          const nodeType: DiscourseNode | undefined = fmNodeTypeId
+            ? plugin.settings.nodeTypes.find((n) => n.id === fmNodeTypeId)
+            : undefined;
+          let preloadedImageSrc: string | undefined = undefined;
+          if (nodeType?.keyImage) {
+            try {
+              const found = await getFirstImageSrcForFile(plugin.app, file);
+              if (found) preloadedImageSrc = found;
+            } catch (e) {
+              console.warn(
+                "ExistingNodeSearch: failed to preload key image",
+                e,
+              );
+            }
+          }
+
+          // Calculate optimal dimensions using dynamic measurement
+          const { w, h } = await calcDiscourseNodeSize({
+            title: file.basename,
+            nodeTypeId: fmNodeTypeId ?? "",
+            imageSrc: preloadedImageSrc,
+            plugin,
+          });
+
           const id = createShapeId();
           editor.createShape({
             id,
             type: "discourse-node",
             x: pagePoint.x - Math.random() * 100,
             y: pagePoint.y - Math.random() * 100,
             props: {
-              w: 200,
-              h: 100,
+              w,
+              h,
               src,
               title: file.basename,
-              nodeTypeId: getFrontmatterForFile(plugin.app, file)?.nodeTypeId,
+              nodeTypeId: fmNodeTypeId ?? "",
+              imageSrc: preloadedImageSrc,
             },
           });
           editor.markHistoryStoppingPoint("add existing discourse node");
@@ -71,7 +103,7 @@ export const ExistingNodeSearch = ({
         }
       })();
     },
-    [canvasFile, getEditor, plugin.app],
+    [canvasFile, getEditor, plugin],
   );
 
   return (

apps/obsidian/src/components/canvas/shapes/DiscourseNodeShape.tsx

@@ -1,8 +1,10 @@
 import {
   BaseBoxShapeUtil,
   HTMLContainer,
+  resizeBox,
   T,
   TLBaseShape,
+  TLResizeInfo,
   useEditor,
 } from "tldraw";
 import type { App, TFile } from "obsidian";
@@ -11,9 +13,11 @@ import DiscourseGraphPlugin from "~/index";
 import {
   getFrontmatterForFile,
   FrontmatterRecord,
+  getFirstImageSrcForFile,
 } from "./discourseNodeShapeUtils";
 import { resolveLinkedFileFromSrc } from "~/components/canvas/stores/assetStore";
 import { getNodeTypeById } from "~/utils/typeUtils";
+import { calcDiscourseNodeSize } from "~/utils/calcDiscourseNodeSize";
 
 export type DiscourseNodeShape = TLBaseShape<
   "discourse-node",
@@ -25,6 +29,7 @@ export type DiscourseNodeShape = TLBaseShape<
     // Cached display data
     title: string;
     nodeTypeId: string;
+    imageSrc?: string;
   }
 >;
 
@@ -44,6 +49,7 @@ export class DiscourseNodeUtil extends BaseBoxShapeUtil<DiscourseNodeShape> {
     src: T.string.nullable(),
     title: T.string.optional(),
     nodeTypeId: T.string.nullable().optional(),
+    imageSrc: T.string.optional(),
   };
 
   getDefaultProps(): DiscourseNodeShape["props"] {
@@ -53,9 +59,20 @@ export class DiscourseNodeUtil extends BaseBoxShapeUtil<DiscourseNodeShape> {
       src: null,
       title: "",
       nodeTypeId: "",
+      imageSrc: undefined,
     };
   }
 
+  override isAspectRatioLocked = () => false;
+  override canResize = () => true;
+
+  override onResize(
+    shape: DiscourseNodeShape,
+    info: TLResizeInfo<DiscourseNodeShape>,
+  ) {
+    return resizeBox(shape, info);
+  }
+
   component(shape: DiscourseNodeShape) {
     return (
       <HTMLContainer>
@@ -158,6 +175,60 @@ const discourseNodeContent = memo(
               },
             });
           }
+
+          let didImageChange = false;
+          let currentImageSrc = shape.props.imageSrc;
+          if (nodeType?.keyImage) {
+            const imageSrc = await getFirstImageSrcForFile(app, linkedFile);
+
+            if (imageSrc && imageSrc !== shape.props.imageSrc) {
+              didImageChange = true;
+              currentImageSrc = imageSrc;
+              editor.updateShape<DiscourseNodeShape>({
+                id: shape.id,
+                type: "discourse-node",
+                props: {
+                  ...shape.props,
+                  imageSrc,
+                },
+              });
+            }
+          } else if (shape.props.imageSrc) {
+            didImageChange = true;
+            currentImageSrc = undefined;
+            editor.updateShape<DiscourseNodeShape>({
+              id: shape.id,
+              type: "discourse-node",
+              props: {
+                ...shape.props,
+                imageSrc: undefined,
+              },
+            });
+          }
+
+          if (didImageChange) {
+            const { w, h } = await calcDiscourseNodeSize({
+              title: linkedFile.basename,
+              nodeTypeId: shape.props.nodeTypeId,
+              imageSrc: currentImageSrc,
+              plugin,
+            });
+            // Only update dimensions if they differ significantly (>1px)
+            if (
+              Math.abs((shape.props.w || 0) - w) > 1 ||
+              Math.abs((shape.props.h || 0) - h) > 1
+            ) {
+              editor.updateShape<DiscourseNodeShape>({
+                id: shape.id,
+                type: "discourse-node",
+                props: {
+                  ...shape.props,
+                  w,
+                  h,
+                },
+              });
+            }
+          }
         } catch (error) {
           console.error("Error loading node data", error);
           return;
@@ -169,17 +240,44 @@ const discourseNodeContent = memo(
       return () => {
         return;
       };
-    }, [src, shape.id, shape.props, editor, app, canvasFile, plugin]);
+      // Only trigger when content changes, not when dimensions change (to avoid fighting manual resizing)
+      // eslint-disable-next-line react-hooks/exhaustive-deps
+    }, [
+      src,
+      shape.id,
+      shape.props.title,
+      shape.props.nodeTypeId,
+      shape.props.imageSrc,
+      editor,
+      app,
+      canvasFile,
+      plugin,
+      nodeType?.keyImage,
+    ]);
 
     return (
       <div
         style={{
           backgroundColor: nodeType?.color ?? "",
         }}
-        className="box-border flex h-full w-full flex-col items-start justify-center rounded-md border-2 p-2"
+        // NOTE: These Tailwind classes (p-2, border-2, rounded-md, m-1, text-base, m-0, text-sm)
+        // correspond to constants in nodeConstants.ts. If you change these classes, update the
+        // constants and the measureNodeText function to keep measurements accurate.
+        className="box-border flex h-full w-full flex-col items-start justify-start rounded-md border-2 p-2"
       >
-        <h1 className="m-0 text-base">{title || "..."}</h1>
+        <h1 className="m-1 text-base">{title || "..."}</h1>
         <p className="m-0 text-sm opacity-80">{nodeType?.name || ""}</p>
+        {shape.props.imageSrc ? (
+          <div className="mt-2 flex min-h-0 w-full flex-1 items-center justify-center overflow-hidden">
+            <img
+              src={shape.props.imageSrc}
+              loading="lazy"
+              decoding="async"
+              draggable="false"
+              className="max-h-full max-w-full object-contain"
+            />
+          </div>
+        ) : null}
       </div>
     );
   },