Crippled version of task display

frontend/src/App.svelte

@@ -2,10 +2,19 @@
   import Graph from "./Graph.svelte";
   import GraphNode from "./GraphNode.svelte";
   import { loadTasks } from "./task-loader";
-  import type { TasksFile } from "./task-loader";
+  import type { TasksFile, TaskDescriptor } from "./task-loader";
   import TasksLoader from "./TasksLoader.svelte";
+  import TaskPanel from "./TaskPanel.svelte";
 
   const tasksPromise: Promise<TasksFile> = loadTasks();
+
+  let selectedTask: string | null = null
+  let finalSelect: boolean = false
+
+  function clickTask(e: CustomEvent<TaskDescriptor>) {
+    finalSelect = true
+  }
+
 </script>
 
 <style>
@@ -37,6 +46,7 @@
 </svg>
 -->
   <TasksLoader promise={tasksPromise} let:data={t}>
-    <Graph tasks={t} />
+    <TaskPanel bind:finalSelect={finalSelect} selectedTask={selectedTask} />
+    <Graph tasks={t} bind:selectedTask={selectedTask} on:selectTask={clickTask} />
   </TasksLoader>
 </main>

frontend/src/Graph.svelte

@@ -1,15 +1,32 @@
 <script type="ts">
   import GraphNode from "./GraphNode.svelte";
   import GraphEdge from "./GraphEdge.svelte";
-  import { onMount } from "svelte";
+  import { createEventDispatcher, onMount } from "svelte";
   import * as d3 from "d3";
   import { createLinksFromTaskMap } from "./task-loader";
-  import type { TasksFile } from "./task-loader";
+  import type { TasksFile, TaskDescriptor } from "./task-loader";
+
+  const eventDispatcher = createEventDispatcher()
 
   export let tasks: TasksFile;
   let nodes = tasks.tasks;
   let edges = createLinksFromTaskMap(tasks);
 
+  export let selectedTask: null | string = null
+  const nodeClick = (task: TaskDescriptor) => (e: CustomEvent<MouseEvent>) => {
+    selectedTask = task.id
+    eventDispatcher("selectTask", task)
+  }
+
+  const nodeHover = (task: TaskDescriptor) => (hovering: CustomEvent<boolean>) => {
+    if (hovering.detail) {
+      selectedTask = task.id
+    } else {
+      if (selectedTask == task.id)
+        selectedTask = null
+    }
+  }
+
   // Svelte automatically fills this with a reference
   let container: HTMLElement;
 
@@ -69,7 +86,7 @@
          <GraphEdge {edge} />
       {/each}
       {#each nodes as task}
-        <GraphNode {task} />
+        <GraphNode {task} on:click={nodeClick(task)} on:hoveringChange={nodeHover(task)} />
       {/each}
     </g>
   </svg>

frontend/src/GraphNode.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { onMount } from "svelte";
+  import { createEventDispatcher, onMount } from "svelte";
 
   import type { TaskDescriptor } from "./task-loader";
 
@@ -7,15 +7,23 @@
   let hovering: boolean = false;
   let text_element: SVGTextElement;
 
+  const eventDispatcher = createEventDispatcher()
+
   $: cx = task === undefined || task.x === undefined ? 0 : task.x;
   $: cy = task === undefined || task.y === undefined ? 0 : task.y;
 
   function enter() {
     hovering = true;
+    eventDispatcher("hoveringChange", hovering)
   }
 
   function leave() {
     hovering = false;
+    eventDispatcher("hoveringChange", hovering)
+  }
+
+  function click(e: MouseEvent) {
+    eventDispatcher("click", e)
   }
 
   let ellipse_rx = 20;
@@ -36,7 +44,7 @@
   }
 </style>
 
-<g on:mouseenter={enter} on:mouseleave={leave}>
+<g on:mouseenter={enter} on:mouseleave={leave} on:click={click}>
   <ellipse rx={ellipse_rx} ry={ellipse_ry} {cx} {cy} />
   <text
     bind:this={text_element}

frontend/src/TaskPanel.svelte

@@ -0,0 +1,42 @@
+<script lang="ts">
+    import { grabAssignment } from "./ksp-task-grabber";
+    import type { TasksFile, TaskDescriptor } from "./task-loader";
+
+    // export let tasks: TasksFile;
+    export let selectedTask: string | null = null
+    export let finalSelect: boolean = false
+    let mouse: boolean = false
+
+    let height: string;
+    $: height = selectedTask == null && !mouse ? "0" :
+                finalSelect ? "100%" :
+                "100px"
+
+    let taskPromise: Promise<string | null>
+    $: {
+        if (selectedTask != null)
+            taskPromise = grabAssignment(selectedTask)
+    }
+</script>
+
+<style>
+    .panel {
+        position: absolute;
+        width: 100%;
+        background-color: #222;
+        overflow: hidden;
+    }
+</style>
+
+<div class="panel" style="height: {height}" on:mouseover={() => mouse = false} on:mouseout={() => mouse = false}>
+    {#if selectedTask != null}
+    {#await taskPromise}
+        Načítám úložku {selectedTask} ;)
+    {:then task}
+        {@html task}
+    {/await}
+    <button type=button on:click={() => finalSelect = false}>
+        Zavřít
+    </button>
+    {/if}
+</div>

frontend/src/ksp-task-grabber.ts

@@ -12,28 +12,28 @@ type TaskLocation = {
     startElement: string
 }
 
-function getLocation(id: string, solution: boolean): TaskLocation {
+function getLocation(id: string, solution: boolean): TaskLocation | null {
     const m = /^(\d+)-(Z?)(\d)-(\d)$/.exec(id)
-    if (!m) throw new Error(`Invalid task id: ${m}`)
-    const [_, rocnik, z, serie, uloha] = m[1]
+    if (!m) return null
+    const [_, rocnik, z, serie, uloha] = m
     if (z == 'Z') {
         const urlX = solution ? "reseni" : "zadani"
         return {
             url: `z/ulohy/${rocnik}/${urlX}${serie}.html`,
-            startElement: `task${uloha}`
+            startElement: `task-${id}`
         }
     } else {
         const urlX = solution ? "solution" : "tasks"
         return {
             url: `tasks/${rocnik}/${urlX}${serie}.html`,
-            startElement: `task${uloha}`
+            startElement: `task-${id}`
         }
     }
 }
 
-function parseTask(startElementId: string, html: string, contentType: string): string {
+function parseTask(startElementId: string, html: string): string {
     const parser = new DOMParser()
-    const doc = parser.parseFromString(html, contentType as any)
+    const doc = parser.parseFromString(html, "text/html")
 
     const titleElement = doc.getElementById(startElementId)
     if (!titleElement)
@@ -69,14 +69,17 @@ async function loadTask({ url, startElement }: TaskLocation) {
         throw Error("Bad request")
     }
     const rText = await r.text()
-    const contentType = r.headers.get("Content-Type") || "text/html"
-    return parseTask(startElement, rText, contentType)
+    return parseTask(startElement, rText)
 }
 
-export function loadAssignment(id: string) {
-    return loadTask(getLocation(id, false))
+export async function grabAssignment(id: string) {
+    const l = getLocation(id, false)
+    if (!l) return "úloha je virtuální a neexistuje"
+    return await loadTask(l)
 }
 
-export function loadSolution(id: string) {
-    return loadTask(getLocation(id, true))
+export async function grabSolution(id: string) {
+    const l = getLocation(id, true)
+    if (!l) return "úloha je virtuální a neexistuje"
+    return await loadTask(l)
 }