From 2fb4b7474d0cf05654fc07e8072367dc7ef97cc5 Mon Sep 17 00:00:00 2001
From: saberzero1 <github@emilebangma.com>
Date: Sat, 1 Mar 2025 21:34:18 +0100
Subject: [PATCH] Canvas stub

---
 quartz/components/pages/CanvasContent.tsx   |  84 ++++++++++++++-
 quartz/components/renderCanvas.tsx          |   4 +-
 quartz/components/scripts/popover.inline.ts | 113 +++++++++++++++++++-
 3 files changed, 195 insertions(+), 6 deletions(-)

diff --git a/quartz/components/pages/CanvasContent.tsx b/quartz/components/pages/CanvasContent.tsx
index 35b0ace6f..dea91b39d 100644
--- a/quartz/components/pages/CanvasContent.tsx
+++ b/quartz/components/pages/CanvasContent.tsx
@@ -1,12 +1,19 @@
 import { ComponentChildren } from "preact"
 import { htmlToJsx } from "../../util/jsx"
+import d3 from "d3"
 import {
   QuartzComponent,
   QuartzComponentConstructor,
   QuartzComponentProps,
   QuartzCanvasComponent,
+  CanvasNode,
+  CanvasEdge,
+  CanvasTextNode,
+  CanvasFileNode,
+  CanvasLinkNode,
+  CanvasGroupNode,
 } from "../types"
-import { type FilePath } from "../../util/path"
+import { type FilePath, slugifyFilePath } from "../../util/path"
 import fs from "fs"
 
 function loadCanvas(file: FilePath): QuartzCanvasComponent {
@@ -15,13 +22,84 @@ function loadCanvas(file: FilePath): QuartzCanvasComponent {
   return JSON.parse(data) as QuartzCanvasComponent
 }
 
+function renderTextNodes(nodes: CanvasTextNode[]): ComponentChildren {
+  return nodes.map((node) => (
+    <div
+      class="canvas canvas-node canvas-text-node"
+      style={{
+        position: "fixed",
+        width: node.width,
+        height: node.height,
+        left: node.x,
+        top: node.y,
+      }}
+    >
+      {node["text"]}
+    </div>
+  ))
+}
+
+function renderFileNodes(nodes: CanvasFileNode[]): ComponentChildren {
+  return nodes.map((node) => (
+    <div
+      class="internal alias internal-canvas"
+      data-slug={slugifyFilePath(node.file as FilePath)}
+      data-x={node.x}
+      data-y={node.y}
+      style={{
+        position: "fixed",
+        width: node.width,
+        height: node.height,
+        left: node.x,
+        top: node.y,
+      }}
+    ></div>
+  ))
+}
+
+function renderLinkNodes(nodes: CanvasLinkNode[]): ComponentChildren {
+  return nodes.map((node) => (
+    <iframe
+      src={node["url"]}
+      style={{
+        position: "fixed",
+        width: node.width,
+        height: node.height,
+        left: node.x,
+        top: node.y,
+      }}
+    />
+  ))
+}
+
 const CanvasContent: QuartzComponent = ({ fileData, tree }: QuartzComponentProps) => {
   //const content = htmlToJsx(fileData.filePath!, tree) as ComponentChildren
-  const content = loadCanvas(fileData.filePath!)
+  const canvas = loadCanvas(fileData.filePath!)
+  const canvasNodes = (canvas["nodes"] ?? []) as CanvasNode[]
+  const canvasEdges = (canvas["edges"] ?? []) as CanvasEdge[]
   const classes: string[] = fileData.frontmatter?.cssclasses ?? []
   const classString = ["popover-hint", ...classes].join(" ")
+
+  // Canvas parts
+  const textNodes = (canvasNodes.filter((node) => node["type"] === "text") ??
+    []) as CanvasTextNode[]
+  const fileNodes = (canvasNodes.filter((node) => node["type"] === "file") ??
+    []) as CanvasFileNode[]
+  const linkNodes = (canvasNodes.filter((node) => node["type"] === "link") ??
+    []) as CanvasLinkNode[]
+  const groupNodes = (canvasNodes.filter((node) => node["type"] === "group") ??
+    []) as CanvasGroupNode[]
+
+  const result = (
+    <article class={classString}>
+      {renderTextNodes(textNodes)}
+      {renderFileNodes(fileNodes)}
+      {renderLinkNodes(linkNodes)}
+    </article>
+  )
+
   //TODO: Implement canvas rendering
-  return <article class={classString}>{content["nodes"]}</article>
+  return <article class={classString}>{result}</article>
 }
 
 export default (() => CanvasContent) satisfies QuartzComponentConstructor
diff --git a/quartz/components/renderCanvas.tsx b/quartz/components/renderCanvas.tsx
index 3a04ba5df..0eb077705 100644
--- a/quartz/components/renderCanvas.tsx
+++ b/quartz/components/renderCanvas.tsx
@@ -91,7 +91,7 @@ export function renderCanvas(
   console.log(root)
 
   // process transcludes in componentData
-  /*visit(root, "element", (node, _index, _parent) => {
+  visit(root, "element", (node, _index, _parent) => {
     if (node.tagName === "blockquote") {
       const classNames = (node.properties?.className ?? []) as string[]
       if (classNames.includes("transclude")) {
@@ -204,7 +204,7 @@ export function renderCanvas(
         }
       }
     }
-  })*/
+  })
 
   // set componentData.tree to the edited html that has transclusions rendered
   componentData.tree = root
diff --git a/quartz/components/scripts/popover.inline.ts b/quartz/components/scripts/popover.inline.ts
index b01af0e85..f586931ff 100644
--- a/quartz/components/scripts/popover.inline.ts
+++ b/quartz/components/scripts/popover.inline.ts
@@ -100,10 +100,121 @@ async function mouseEnterHandler(
   }
 }
 
+async function navigationHandler(this: HTMLAnchorElement) {
+  const link = this
+  if (link.dataset.noPopover === "true") {
+    return
+  }
+
+  const canvasX = Number(link.getAttribute("data-x") ?? "0")
+  const canvasY = Number(link.getAttribute("data-y") ?? "0")
+
+  async function setPosition(popoverElement: HTMLElement) {
+    const { x, y } = await computePosition(link, popoverElement, {
+      middleware: [inline({ x: canvasX, y: canvasY }), shift(), flip()],
+    })
+    Object.assign(popoverElement.style, {
+      left: `${x}px`,
+      top: `${y}px`,
+      width: "100%",
+      height: "100%",
+    })
+  }
+
+  const hasAlreadyBeenFetched = () =>
+    [...link.children].some((child) => child.classList.contains("popover"))
+
+  // dont refetch if there's already a popover
+  if (hasAlreadyBeenFetched()) {
+    return setPosition(link.lastChild as HTMLElement)
+  }
+
+  const thisUrl = new URL(document.location.href)
+  thisUrl.hash = ""
+  thisUrl.search = ""
+  const targetUrl = new URL(link.href)
+  const hash = decodeURIComponent(targetUrl.hash)
+  targetUrl.hash = ""
+  targetUrl.search = ""
+
+  const response = await fetchCanonical(targetUrl).catch((err) => {
+    console.error(err)
+  })
+
+  // bailout if another popover exists
+  if (hasAlreadyBeenFetched()) {
+    return
+  }
+
+  if (!response) return
+  const [contentType] = response.headers.get("Content-Type")!.split(";")
+  const [contentTypeCategory, typeInfo] = contentType.split("/")
+
+  const popoverElement = document.createElement("div")
+  popoverElement.classList.add("popover")
+  const popoverInner = document.createElement("div")
+  popoverInner.classList.add("popover-inner")
+  popoverElement.appendChild(popoverInner)
+
+  popoverInner.dataset.contentType = contentType ?? undefined
+
+  switch (contentTypeCategory) {
+    case "image":
+      const img = document.createElement("img")
+      img.src = targetUrl.toString()
+      img.alt = targetUrl.pathname
+
+      popoverInner.appendChild(img)
+      break
+    case "application":
+      switch (typeInfo) {
+        case "pdf":
+          const pdf = document.createElement("iframe")
+          pdf.src = targetUrl.toString()
+          popoverInner.appendChild(pdf)
+          break
+        default:
+          break
+      }
+      break
+    default:
+      const contents = await response.text()
+      const html = p.parseFromString(contents, "text/html")
+      normalizeRelativeURLs(html, targetUrl)
+      const elts = [...html.getElementsByClassName("popover-hint")]
+      if (elts.length === 0) return
+
+      elts.forEach((elt) => popoverInner.appendChild(elt))
+  }
+
+  setPosition(popoverElement)
+  link.appendChild(popoverElement)
+
+  if (hash !== "") {
+    const heading = popoverInner.querySelector(hash) as HTMLElement | null
+    if (heading) {
+      // leave ~12px of buffer when scrolling to a heading
+      popoverInner.scroll({ top: heading.offsetTop - 12, behavior: "instant" })
+    }
+  }
+}
+
 document.addEventListener("nav", () => {
   const links = [...document.getElementsByClassName("internal")] as HTMLAnchorElement[]
-  for (const link of links) {
+  console.log(links)
+  const pageLinks = links.filter((link) =>
+    link.classList.contains("internal-canvas"),
+  ) as HTMLAnchorElement[]
+  const canvasLinks = links.filter(
+    (link) => !link.classList.contains("internal-canvas"),
+  ) as HTMLAnchorElement[]
+  for (const link of pageLinks) {
     link.addEventListener("mouseenter", mouseEnterHandler)
     window.addCleanup(() => link.removeEventListener("mouseenter", mouseEnterHandler))
   }
+  //TODO: Fix canvas loading of popovers
+  for (const link of canvasLinks) {
+    link.addEventListener("load", navigationHandler)
+    window.addCleanup(() => link.removeEventListener("load", navigationHandler))
+  }
 })