Several documents

A viewer can hold several documents at once, like tabs in a browser. One of them is the active document, and every component talks to it unless you say otherwise:

tabs.svelte

<script lang="ts">
  import { useDocuments, useDocumentsState } from '@embedpdf/svelte/runtime';

  const documents = useDocuments();
  const state = useDocumentsState();
</script>

<div role="tablist">
  {#each state.documents as document (document.id)}
    <div>
      <button
        role="tab"
        aria-selected={document.id === state.activeId}
        onclick={() => documents.setActive(document.id)}
      >
        {document.name}
      </button>
      <button aria-label="Close {document.name}" onclick={() => documents.close(document.id)}>×</button>
    </div>
  {/each}
</div>

Each document keeps its own state: its zoom and scroll position, its selection, its search and its active tool. Switch tabs and back, and everything is where you left it.

Loading live preview…

<script lang="ts" module>
  import { DocumentGate, Viewer, type OpenInput } from '@embedpdf/svelte/runtime';
  import { RenderLayer, renderPlugin } from '@embedpdf/svelte/render';
  import { Stage, stagePlugin } from '@embedpdf/svelte/stage';
  import { localEngine } from '@embedpdf/engine';
  import TabTools from './TabTools.svelte';
  import Tabs from './Tabs.svelte';

  import '../tabs.css';

  const engine = localEngine();
  const plugins = [stagePlugin(), renderPlugin()];

  const ebook = async (): Promise<OpenInput> => {
    const response = await fetch('https://snippet.embedpdf.com/ebook.pdf');
    return { kind: 'bytes', bytes: new Uint8Array(await response.arrayBuffer()) };
  };
</script>

<Viewer
  {engine}
  {plugins}
  initialDocuments={[
    { source: ebook, name: 'Contract' },
    { source: ebook, name: 'Report' },
  ]}
>
  <Tabs {ebook} />
  <DocumentGate>
    {#snippet fallback()}
      <p class="loading">Opening…</p>
    {/snippet}
    <TabTools />
    <Stage class="stage">
      <RenderLayer />
    </Stage>
  </DocumentGate>
</Viewer>

Manage the tabs#

documents.setActive(id);
documents.rename(id, 'Signed contract');
documents.move(id, 0); // to the front
await documents.close(id);

Each entry in documents, from useDocumentsState(), has the document’s id, its name, and its status: 'loading', 'locked', 'ready' or 'error', so a tab can show a spinner or a lock. Every field is listed under State.

Talk to a specific document#

A component talks to the active document. Inside <DocumentScope>, it talks to the one you name, whatever is active:

document-scope.svelte

<script lang="ts">
  import { DocumentScope } from '@embedpdf/svelte/runtime';
  import { RenderLayer } from '@embedpdf/svelte/render';
  import { Stage } from '@embedpdf/svelte/stage';
  import ZoomControls from './ZoomControls.svelte';

  let { documentId }: { documentId: string } = $props();
</script>

<DocumentScope id={documentId}>
  <Stage>
    <RenderLayer />
  </Stage>
  <ZoomControls />
</DocumentScope>

Everything inside, such as the Stage, useSearch() and useSelection(), uses that document. That’s how you show two documents at once, or a preview of one while another is active.

Loading live preview…

<script lang="ts" module>
  import { Viewer, type OpenInput } from '@embedpdf/svelte/runtime';
  import { renderPlugin } from '@embedpdf/svelte/render';
  import { stagePlugin } from '@embedpdf/svelte/stage';
  import { localEngine } from '@embedpdf/engine';
  import SideBySide from './SideBySide.svelte';

  import '../scope.css';

  const engine = localEngine();
  const plugins = [stagePlugin(), renderPlugin()];

  const ebook = async (): Promise<OpenInput> => {
    const response = await fetch('https://snippet.embedpdf.com/ebook.pdf');
    return { kind: 'bytes', bytes: new Uint8Array(await response.arrayBuffer()) };
  };
</script>

<Viewer
  {engine}
  {plugins}
  initialDocuments={[
    { source: ebook, name: 'Original' },
    { source: ebook, name: 'Revised' },
  ]}
>
  <SideBySide />
</Viewer>

Side by side#

The view manager arranges documents into panes, each with its own tabs, like split editors in a code editor. Register viewManagerPlugin(), then render one Stage per pane:

panes.svelte

<script lang="ts">
  import { DocumentScope } from '@embedpdf/svelte/runtime';
  import { RenderLayer } from '@embedpdf/svelte/render';
  import { Stage } from '@embedpdf/svelte/stage';
  import { useViewManager, useViewManagerState } from '@embedpdf/svelte/view-manager';
  import PaneTabs from './PaneTabs.svelte';

  const views = useViewManager();
  const state = useViewManagerState();
</script>

<div class="panes">
  {#each state.panes as pane (pane.id)}
    <section data-focused={pane.id === state.focusedPaneId} onfocusin={() => views.setFocusedPane(pane.id)}>
      <PaneTabs {pane} />
      {#if pane.activeDocumentId}
        <DocumentScope id={pane.activeDocumentId}>
          <Stage>
            <RenderLayer />
          </Stage>
        </DocumentScope>
      {/if}
    </section>
  {/each}
</div>

views.splitPane(documentId); // the document in a new pane, beside the focused one
views.setActiveDocument(paneId, documentId); // show another of the pane's tabs
views.moveDocumentBetween(fromPaneId, toPaneId, documentId); // drag a tab to another pane
views.removePane(paneId); // its documents move to another pane

A document opened with documents.open() lands in the focused pane. Every call is listed under Methods.

Loading live preview…

<script lang="ts" module>
  import { Viewer, type OpenInput } from '@embedpdf/svelte/runtime';
  import { renderPlugin } from '@embedpdf/svelte/render';
  import { stagePlugin } from '@embedpdf/svelte/stage';
  import { viewManagerPlugin } from '@embedpdf/svelte/view-manager';
  import { localEngine } from '@embedpdf/engine';
  import Panes from './Panes.svelte';

  import '../panes.css';

  const engine = localEngine();
  const plugins = [stagePlugin(), renderPlugin(), viewManagerPlugin()];

  const ebook = async (): Promise<OpenInput> => {
    const response = await fetch('https://snippet.embedpdf.com/ebook.pdf');
    return { kind: 'bytes', bytes: new Uint8Array(await response.arrayBuffer()) };
  };
</script>

<Viewer
  {engine}
  {plugins}
  initialDocuments={[
    { source: ebook, name: 'Contract' },
    { source: ebook, name: 'Report' },
  ]}
>
  <Panes />
</Viewer>

Methods#

What useDocuments() gives you for several documents. Opening and closing are on Opening documents, downloading and printing on Saving & downloading.

Method	What it does
`setActive(id)`	Makes a document the active one: the one every component talks to outside `<DocumentScope>`. Manage the tabs
`rename(id, name)`	Changes the name its tab shows. The file doesn’t change.
`move(id, index)`	Moves a document to another place in the tab order
`swap(id, otherId)`	Swaps two documents in the tab order
`setOrder(ids)`	Puts every document in a new order at once. `ids` holds the id of every open document.

Everything useViewManager() gives you.

Method	What it does
`splitPane(documentId, { from? })`	Moves an open document into a new pane beside the focused one, or beside `from`, and focuses it. Returns the new pane’s id. Side by side
`createPane({ documentIds? })`	Adds a pane, empty or with these documents moved into it, and focuses it. Returns its id.
`removePane(paneId, { moveDocumentsTo? })`	Closes a pane. Its documents move to `moveDocumentsTo`, or else to the focused or the last pane.
`movePane(paneId, index)`	Moves a pane to another place in the order, for reordering panes by dragging
`setFocusedPane(paneId)`	Makes a pane the focused one, where new documents open. `null` focuses none.
`setActiveDocument(paneId, documentId)`	Shows another of the pane’s documents
`addDocument(paneId, documentId, index?)`	Adds a document to a pane’s tabs. A document is in one pane at a time, so it leaves the pane it was in.
`removeDocument(paneId, documentId)`	Takes a document out of a pane, without closing it
`moveDocumentWithin(paneId, documentId, index)`	Moves a tab to another place inside its pane
`moveDocumentBetween(fromPaneId, toPaneId, documentId, index?)`	Moves a tab from one pane to another, for dragging tabs between panes

State#

Everything useDocumentsState() gives you, as one reactive object: read its fields, and your markup updates when they change. The method in the last column reads the same value once.

Field	What it is	Read once
`documents`	Every open document, in tab order, including ones that are loading, locked or failed. Each has the fields `useDocument()` gives you.	`list()`, `has(id)`, `getCount()`, `getOrder()`
`activeId`	The active document’s id, or `null` with no document open	`getActiveId()`, or `getActive()` for its fields

has(id) says whether a document is open, getCount() how many are, and getOrder() gives just their ids. One document’s fields come from get(id), on Opening documents.

Everything useViewManagerState() gives you, as one reactive object: read its fields, and your markup updates when they change. The method in the last column reads the same value once.

Field	What it is	Read once
`panes`	Every pane, in order. Each has its `id`, its `documentIds` (its tabs, in order) and the `activeDocumentId` it shows.	`listPanes()`, `getPane(paneId)`, `getPaneOrder()`, `getPaneOfDocument(documentId)`
`focusedPaneId`	The pane new documents open in, or `null`	`getFocusedPaneId()`

getPane(paneId) reads one pane, getPaneOrder() gives just their ids, and getPaneOfDocument(documentId) says which pane holds a document.

Events#

active-route.svelte

<script lang="ts">
  import { goto } from '$app/navigation';
  import { useDocumentsEvent } from '@embedpdf/svelte/runtime';

  useDocumentsEvent(
    (documents) => documents.onActiveChanged,
    ({ documentId }) => goto(`/documents/${documentId}`, { replaceState: true }),
  );
</script>

Event	Fires when	Carries
`onActiveChanged`	Another document became the active one	`documentId`, `previousDocumentId`
View manager `onPaneCreated`	A pane was added	`paneId`
View manager `onPaneRemoved`	A pane was closed	`paneId`
View manager `onFocusChanged`	Another pane got the focus	`paneId`, or `null` when none has it
View manager `onDocumentMoved`	A document moved between panes	`documentId`, `fromPaneId`, `toPaneId`

The view manager’s events come from useViewManagerEvent(). Opening and closing documents are on Opening documents.

Good to know#

Memory#

Each open document holds its file in the engine’s memory. Close documents the user is done with, especially large ones.

One Stage per view#

A Stage shows one document. For two documents at once, render two Stages, each in its own <DocumentScope>. For two views of one document, see Two views of one document.

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