Merge pull request #957 from mermaid-js/sidv/panzoom

Add PanZoom

.github/workflows/tests.yml

@@ -9,6 +9,11 @@ on:
 jobs:
   cypress-run:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # run 3 copies of the current job in parallel
+        containers: [1, 2, 3]
 
     steps:
       - name: Checkout
@@ -30,12 +35,6 @@ jobs:
           node-version: 16
           cache: 'yarn'
 
-      - name: Lint & Test
-        run: |
-          yarn install
-          yarn lint
-          yarn test:unit
-
       # Install NPM dependencies, cache them correctly
       # and run all Cypress tests
       - name: Cypress run
@@ -46,5 +45,6 @@ jobs:
           wait-on: 'http://localhost:3000'
           record: true
           headless: true
+          parallel: true
         env:
           CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}

.github/workflows/unit-tests.yml

@@ -0,0 +1,36 @@
+name: Unit Tests
+
+on:
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - uses: actions/cache@v3
+        id: yarn-and-build-cache
+        with:
+          path: |
+            build
+            node_modules
+          key: ${{ runner.os }}-node_modules-build-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-node_modules-build-
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          cache: 'yarn'
+
+      - name: Lint & Test
+        run: |
+          yarn install
+          yarn lint
+          yarn test:unit

cypress.config.js

@@ -8,6 +8,10 @@ export default defineConfig({
 	snapshotFileName: './cypress/snapshots.js',
 	defaultCommandTimeout: 16000,
 	requestTimeout: 16000,
+	retries: {
+		runMode: 2,
+		openMode: 0
+	},
 	e2e: {
 		setupNodeEvents(on, config) {
 			on('task', {
@@ -26,6 +30,6 @@ export default defineConfig({
 			});
 		},
 		baseUrl: 'http://localhost:3000',
-		specPattern: 'cypress/e2e/**/*.{js,jsx,ts,tsx}'
+		specPattern: 'cypress/e2e/**/*.spec.ts'
 	}
 });

cypress/e2e/actions.spec.ts

@@ -1,7 +1,9 @@
+import { disableDebounce } from './util';
 describe('Check actions', () => {
 	beforeEach(() => {
 		cy.clearLocalStorage();
 		cy.visit('/edit');
+		disableDebounce();
 	});
 
 	it('should update markdown code', () => {
@@ -24,8 +26,7 @@ describe('Check actions', () => {
 	});
 
 	it('should download png and svg', () => {
-		const now = new Date(2022, 0, 1).getTime();
-		cy.clock(now);
+		cy.clock(new Date(2022, 0, 1).getTime());
 		const downloadsFolder = Cypress.config('downloadsFolder');
 
 		const verifyFileSize = (fileType: string, size: number) => {

cypress/e2e/diagramUpdate.spec.ts

@@ -1,16 +1,10 @@
-describe('Auto sync tests', () => {
-	const cmd = Cypress.platform === 'darwin' ? 'meta' : 'ctrl';
-	const getEditor = ({ bottom = true, newline = false } = {}) =>
-		cy
-			.get('#editor textarea:first')
-			.click()
-			.focused()
-			.type(`${bottom ? '{pageDown}' : `{${cmd}}`}`)
-			.type(`${newline ? '{enter}' : `{${cmd}}`}`);
+import { getEditor, cmd, disableDebounce } from './util';
 
+describe('Auto sync tests', () => {
 	beforeEach(() => {
 		cy.clearLocalStorage();
 		cy.visit('/');
+		disableDebounce();
 	});
 
 	it('should dim diagram when code is edited', () => {
@@ -26,7 +20,7 @@ describe('Auto sync tests', () => {
 		cy.get('#view').should('not.have.class', 'outOfSync');
 		getEditor().type('  C --> Test');
 		cy.get('#view').should('have.class', 'outOfSync');
-		getEditor().type(`{${cmd}}{enter}`);
+		getEditor().type(`${cmd}{enter}`);
 		cy.get('#view').should('not.have.class', 'outOfSync');
 	});
 
@@ -52,10 +46,10 @@ describe('Auto sync tests', () => {
 	});
 
 	it('supports commenting code out/in', () => {
-		getEditor().type(`{uparrow}{${cmd}}/`);
+		getEditor().type(`{uparrow}${cmd}/`);
 		cy.get('#view').contains('Car').should('not.exist');
 
-		getEditor().type(`{uparrow}{${cmd}}/`);
+		getEditor().type(`{uparrow}${cmd}/`);
 		cy.get('#view').contains('Car').should('exist');
 	});
 
@@ -73,3 +67,18 @@ describe('Auto sync tests', () => {
 			.should('exist');
 	});
 });
+
+describe.only('Pan and Zoom', () => {
+	beforeEach(() => {
+		cy.clearLocalStorage();
+		cy.visit('/');
+		disableDebounce();
+	});
+	it('should toggle pan and zoom', () => {
+		cy.get('#svg-pan-zoom-reset-pan-zoom').should('not.exist');
+		cy.contains('Pan & Zoom').click();
+		cy.get('#svg-pan-zoom-reset-pan-zoom').should('exist');
+		cy.contains('Pan & Zoom').click();
+		cy.get('#svg-pan-zoom-reset-pan-zoom').should('not.exist');
+	});
+});

cypress/e2e/history.spec.ts

@@ -1,8 +1,11 @@
+import { getEditor, disableDebounce } from './util';
+
 describe('Save History', () => {
 	beforeEach(() => {
 		cy.clock();
 		cy.clearLocalStorage();
 		cy.visit('/edit');
+		disableDebounce();
 		cy.contains('Actions').click();
 		cy.contains('History').click();
 	});
@@ -18,14 +21,14 @@ describe('Save History', () => {
 			expect(str).to.equal('State already saved.');
 		});
 		cy.on('window:confirm', () => true);
-		cy.get('#editor').type('  C --> HistoryTest');
+		getEditor().type('  C --> HistoryTest');
 		cy.get('#saveHistory').click();
 		cy.get('#historyList').find('li').should('have.length', 2);
 	});
 
 	it('should be able to restore and delete', () => {
 		cy.get('#saveHistory').click();
-		cy.get('#editor').type('  C --> HistoryTest');
+		getEditor().type('  C --> HistoryTest');
 		cy.get('#historyList').find('No items in History').should('not.exist');
 		cy.get('#historyList').find('li').should('have.length', 1);
 		cy.contains('HistoryTest');
@@ -35,7 +38,7 @@ describe('Save History', () => {
 		cy.get('#historyList').find('li').should('have.length', 0);
 		cy.get('#historyList').contains('No items in History');
 		cy.get('#saveHistory').click();
-		cy.get('#editor').type('  C --> HistoryTest');
+		getEditor().type('  C --> HistoryTest');
 		cy.get('#saveHistory').click();
 		cy.get('#editor').type('ing');
 		cy.get('#clearHistory').click();
@@ -48,7 +51,7 @@ describe('Save History', () => {
 
 	// TODO: Fix #639
 	xit('should auto save history', () => {
-		cy.get('#editor').type('  C --> HistoryTest');
+		getEditor().type('  C --> HistoryTest');
 		cy.tick(70000);
 		cy.contains('Timeline').click();
 		cy.get('#historyList').find('li').should('have.length', 1);

cypress/e2e/loadSite.spec.ts

@@ -1,11 +1,13 @@
 import { toBase64 } from 'js-base64';
+import { disableDebounce } from './util';
 
 describe('Site Loads', () => {
 	beforeEach(() => {
 		cy.clearLocalStorage();
+		cy.visit('/');
+		disableDebounce();
 	});
 	it('Check Home page load', () => {
-		cy.visit('/');
 		cy.url().should('include', '/edit');
 		cy.contains('History').click();
 		cy.getLocalStorage('codeStore').snapshot();
@@ -15,12 +17,7 @@ describe('Site Loads', () => {
 		cy.visit(
 			'/#/edit/eyJjb2RlIjoiZ3JhcGggVERcbiAgICBBW0NocmlzdG1hc10gLS0-fEdldCBtb25leXwgQihHbyBzaG9wcGluZylcbiAgICBCIC0tPiBDe0xldCBtZSB0aGlua31cbiAgICBDIC0tPnxPbmV8IERbTGFwdG9wXVxuICAgIEMgLS0-fFR3b3wgRVtpUGhvbmVdXG4gICAgQyAtLT58VGhyZWV8IEZbZmE6ZmEtY2FyIENhcl0iLCJtZXJtYWlkIjp7InRoZW1lIjoiZGVmYXVsdCJ9LCJ1cGRhdGVFZGl0b3IiOmZhbHNlfQ'
 		);
-		cy.url().should(
-			'include',
-			'/edit#pako:eNpVkM1qw0AMhF9F6NRC_AI-FBo7zSXQQHLz-iC8cnZJ9oe1TAm2373rmkKrk9B8MwyasAuascRbomjgWisPed6byiQ7iKOhhaJ4m48s4ILn5wz7l2OAwYQYrb-9bvx-haCaTivGIMb6-7JJ1Y__0_MMdXOiKCG2f5XrV5jh0NizyfH_FZM4uz6ansqeio4SVJRa3KHj5MjqXHtaDQrFsGOFZV419zQ-RKHyS0bHqEn4oK2EhDnmMfAOaZRwefoOS0kj_0K1pfwFtx2XbzAdW4g'
-		);
-		cy.contains('History').click();
-		cy.getLocalStorage('codeStore').snapshot();
+		cy.url().should('include', '/edit#pako:eNp');
 	});
 
 	it('should load sample diagrams when clicked', () => {
@@ -91,6 +88,7 @@ describe('Site Loads', () => {
 
 	it('should show troubleshooting steps if loading fails', () => {
 		cy.visit('/#/edit/eyJjb2RlIjoiZ3JhcGggVERcbiAg');
+		cy.reload(true);
 		cy.contains('Please Click here to Raise an issue in github.');
 	});
 
@@ -117,7 +115,6 @@ describe('Site Loads', () => {
 		cy.visit(
 			'/edit#pako:eNptkU1PwzAMhv9K5BOI9Q9EXBDbJA477YYqITcxndV8QD40weh_Jy1rGR0-OY_tV2_sEyivCSQogzGuGduAtnaixINji0bcf1WVWGfVXdMtx8M1faYm4B8sxR27JLClJd6nwK4VLTlN4bI4jMQd2pLe3C4KFhNNcLQ92jv9ADGLNoTdozc-zIV4ZDsNlud7RtVN7_5Sb_jYrFcN3iN_0pPbEqUZK3QbTP_Ojyv4NdR4bwTHlyMbPcOQ3WJ2CliBpWCRdbnLqFJDOpClGmRJNYauhtr1pS-_6bKMjebkA8hXNJFWgDn5_YdTIFPINDWdb3vu6r8BaWOZRQ'
 		);
-		cy.reload();
 		cy.contains('Animal');
 	});
 });

cypress/e2e/util.ts

@@ -0,0 +1,11 @@
+export const cmd = `{${Cypress.platform === 'darwin' ? 'meta' : 'ctrl'}}`;
+
+export const getEditor = ({ bottom = true, newline = false } = {}) =>
+	cy
+		.get('#editor textarea:first')
+		.click()
+		.focused()
+		.type(`${bottom ? '{pageDown}' : cmd}`)
+		.type(`${newline ? '{enter}' : cmd}`);
+
+export const disableDebounce = () => cy.setLocalStorage('noDebounce', 'true');

package.json

@@ -73,7 +73,8 @@
 		"monaco-editor": "0.34.0",
 		"monaco-mermaid": "1.0.6",
 		"pako": "2.0.4",
-		"random-word-slugs": "0.1.6"
+		"random-word-slugs": "0.1.6",
+		"svg-pan-zoom": "^3.6.1"
 	},
 	"lint-staged": {
 		"*.{ts,svelte,js,css,md,json}": [

src/lib/components/editor.svelte

@@ -24,15 +24,18 @@
 	};
 	let oldText = text;
 	$: editor && Monaco?.editor.setModelLanguage(editor.getModel(), language);
-	$: {
-		if (text !== oldText) {
+
+	const handleTextUpdate = (newText: string) => {
+		if (newText !== oldText) {
 			if ($stateStore.updateEditor) {
-				editor?.setValue(text);
+				editor?.setValue(newText);
 			}
-			oldText = text;
+			oldText = newText;
 		}
 		editor && Monaco?.editor.setModelMarkers(editor.getModel(), 'test', $stateStore.errorMarkers);
-	}
+	};
+
+	$: handleTextUpdate(text);
 
 	themeStore.subscribe(({ isDark }) => {
 		editor && Monaco?.editor.setTheme(isDark ? 'mermaid-dark' : 'mermaid');
@@ -62,9 +65,9 @@
 		initEditor(Monaco);
 		editor = Monaco.editor.create(divEl, editorOptions);
 		editor.onDidChangeModelContent(() => {
-			text = editor.getValue();
+			oldText = editor.getValue();
 			dispatch('update', {
-				text
+				text: oldText
 			});
 		});
 		editor.addAction({

src/lib/components/preset.svelte

@@ -97,7 +97,8 @@
 	const loadSampleDiagram = (diagramType: string): void => {
 		updateCode(samples[diagramType], {
 			updateDiagram: true,
-			updateEditor: true
+			updateEditor: true,
+			resetPanZoom: true
 		});
 	};
 </script>

src/lib/components/view.svelte

@@ -1,7 +1,9 @@
 <script lang="ts">
-	import { inputStateStore, stateStore } from '$lib/util/state';
+	import { inputStateStore, stateStore, updateCodeStore } from '$lib/util/state';
 	import { onMount } from 'svelte';
 	import mermaid from 'mermaid';
+	import panzoom from 'svg-pan-zoom';
+	import type { State } from '$lib/types';
 
 	let code = '';
 	let config = '';
@@ -9,7 +11,46 @@
 	let view: HTMLDivElement;
 	let error = false;
 	let outOfSync = false;
+	let hide = false;
 	let manualUpdate = true;
+	let panZoomEnabled = $stateStore.panZoom;
+	let pzoom: SvgPanZoom.Instance;
+	let debounce: number;
+
+	const handlePanZoomChange = () => {
+		const pan = pzoom.getPan();
+		const zoom = pzoom.getZoom();
+		clearTimeout(debounce);
+		debounce = window.setTimeout(() => {
+			updateCodeStore({ pan, zoom });
+		}, 200);
+	};
+
+	const handlePanZoom = (state: State) => {
+		if (!state.panZoom) {
+			return;
+		}
+		hide = true;
+		pzoom?.destroy();
+		pzoom = undefined;
+		Promise.resolve().then(() => {
+			const graphDiv = document.getElementById('graph-div');
+			pzoom = panzoom(graphDiv, {
+				onPan: handlePanZoomChange,
+				onZoom: handlePanZoomChange,
+				controlIconsEnabled: true,
+				fit: true,
+				center: true
+			});
+			const { pan, zoom } = state;
+			if (pan !== undefined && zoom !== undefined && Number.isFinite(zoom)) {
+				pzoom.zoom(zoom);
+				pzoom.pan(pan);
+			}
+			hide = false;
+		});
+	};
+
 	onMount(() => {
 		stateStore.subscribe((state) => {
 			if (state.error !== undefined) {
@@ -24,19 +65,23 @@
 					}
 					outOfSync = false;
 					manualUpdate = true;
-					if (code === state.code && config === state.mermaid) {
-						// Do not render if there is no change in Code/Config
+					if (code === state.code && config === state.mermaid && panZoomEnabled === state.panZoom) {
+						// Do not render if there is no change in Code/Config/PanZoom
 						return;
 					}
 					code = state.code;
 					config = state.mermaid;
+					panZoomEnabled = state.panZoom;
 					const scroll = view.parentElement.scrollTop;
 					delete container.dataset.processed;
 					mermaid.initialize(Object.assign({}, JSON.parse(state.mermaid)));
 					mermaid.render('graph-div', code, (svgCode) => {
 						if (svgCode.length > 0) {
-							console.log(svgCode);
+							handlePanZoom(state);
 							container.innerHTML = svgCode;
+							const graphDiv = document.getElementById('graph-div');
+							graphDiv.setAttribute('height', '100%');
+							graphDiv.style.maxWidth = '100%';
 						}
 					});
 					view.parentElement.scrollTop = scroll;
@@ -51,6 +96,11 @@
 				error = true;
 			}
 		});
+		window.addEventListener('resize', () => {
+			if ($stateStore.panZoom && pzoom) {
+				pzoom.resize();
+			}
+		});
 	});
 </script>
 
@@ -58,16 +108,25 @@
 	<div class="p-2 text-red-600" id="errorContainer">{$stateStore.error}</div>
 {/if}
 
-<div id="view" bind:this={view} class="p-2" class:error class:outOfSync>
-	<div id="container" bind:this={container} class="flex-1 overflow-auto" />
+<div id="view" bind:this={view} class="p-2 h-full" class:error class:outOfSync>
+	<div id="container" bind:this={container} class="h-full overflow-auto" class:hide />
 </div>
 
 <style>
 	#view {
 		flex: 1;
 	}
+
+	#container {
+		transition: visibility 0.3s;
+	}
+
 	.error,
 	.outOfSync {
 		opacity: 0.5;
 	}
+
+	.hide {
+		visibility: hidden;
+	}
 </style>

src/lib/types.d.ts

@@ -39,6 +39,9 @@ export interface State {
 	updateEditor: boolean;
 	updateDiagram: boolean;
 	autoSync: boolean;
+	panZoom?: boolean;
+	pan?: { x: number; y: number };
+	zoom?: number;
 	loader?: LoaderConfig;
 }
 

src/lib/util/state.ts

@@ -79,7 +79,7 @@ export const stateStore: Readable<ValidatedState> = derived([inputStateStore], (
 
 export const loadState = (data: string): void => {
 	let state: State;
-	console.log('Loading', data);
+	console.log(`Loading '${data}'`);
 	try {
 		state = deserializeState(data);
 		const mermaidConfig: { [key: string]: string } =
@@ -114,7 +114,11 @@ export const updateCodeStore = (newState: Partial<State>): void => {
 let prompted = false;
 export const updateCode = (
 	code: string,
-	{ updateEditor, updateDiagram = false }: { updateEditor: boolean; updateDiagram?: boolean }
+	{
+		updateEditor,
+		updateDiagram = false,
+		resetPanZoom = false
+	}: { updateEditor: boolean; updateDiagram?: boolean; resetPanZoom?: boolean }
 ): void => {
 	saveStatistics(code);
 	const lines = (code.match(/\n/g) || '').length + 1;
@@ -132,6 +136,10 @@ export const updateCode = (
 	}
 
 	inputStateStore.update((state) => {
+		if (resetPanZoom) {
+			state.pan = undefined;
+			state.zoom = undefined;
+		}
 		return { ...state, code, updateEditor, updateDiagram };
 	});
 };

src/lib/util/util.ts

@@ -24,3 +24,5 @@ export const initHandler = async (): Promise<void> => {
 
 export const isMac = navigator.platform.toUpperCase().indexOf('MAC') >= 0;
 export const cmdKey = isMac ? 'Cmd' : 'Ctrl';
+
+export const debounceEnabled = window.localStorage.getItem('noDebounce') !== 'true';

src/routes/__layout.svelte

@@ -5,10 +5,14 @@
 	import { loadingStateStore } from '$lib/util/loading';
 	import { setTheme, themeStore } from '$lib/util/theme';
 	import { toggleDarkTheme } from '$lib/util/state';
+	import { initHandler } from '$lib/util/util';
 
 	// This can be removed once https://github.com/sveltejs/kit/issues/1612 is fixed.
 	// Then move it into src and vite will bundle it automatically.
 	onMount(() => {
+		window.addEventListener('hashchange', async (ev) => {
+			await initHandler();
+		});
 		if ('serviceWorker' in navigator) {
 			navigator.serviceWorker
 				.register(`${base}/service-worker.js`, {

src/routes/edit.svelte

@@ -7,7 +7,7 @@
 	import Card from '$lib/components/card/card.svelte';
 	import History from '$lib/components/history/history.svelte';
 	import { updateCode, updateConfig, inputStateStore, stateStore } from '$lib/util/state';
-	import { cmdKey, initHandler, syncDiagram } from '$lib/util/util';
+	import { cmdKey, debounceEnabled, initHandler, syncDiagram } from '$lib/util/util';
 	import { onMount } from 'svelte';
 	import type { EditorUpdateEvent, State, Tab, DocConfig } from '$lib/types';
 	import { base } from '$app/paths';
@@ -63,14 +63,15 @@
 	let text = '';
 	let docURL = docURLBase;
 	let language: Languages = 'mermaid';
-	$: language = languageMap[selectedMode];
-	$: {
-		if (selectedMode === 'code') {
+	const handleModeUpdate = (mode: Modes) => {
+		if (mode === 'code') {
 			text = $stateStore.code;
 		} else {
 			text = $stateStore.mermaid;
 		}
-	}
+	};
+	$: language = languageMap[selectedMode];
+	$: handleModeUpdate(selectedMode);
 
 	stateStore.subscribe((state: State) => {
 		if (state.updateEditor) {
@@ -100,14 +101,26 @@
 		}
 	];
 
-	const updateHandler = (message: CustomEvent<EditorUpdateEvent>) => {
-		const code = message.detail.text;
+	const handleUpdate = (text: string) => {
 		if (selectedMode === 'code') {
-			updateCode(code, {
+			updateCode(text, {
 				updateEditor: false
 			});
 		} else {
-			updateConfig(code, false);
+			updateConfig(text, false);
+		}
+	};
+
+	let debounce: { [key: string]: number } = {};
+	const updateHandler = ({ detail: { text } }: CustomEvent<EditorUpdateEvent>) => {
+		console.log({ debounceEnabled });
+		if (debounceEnabled) {
+			clearTimeout(debounce[selectedMode]);
+			debounce[selectedMode] = window.setTimeout(() => {
+				handleUpdate(text);
+			}, 300);
+		} else {
+			handleUpdate(text);
 		}
 	};
 
@@ -138,34 +151,32 @@
 	<div class="flex-1 flex overflow-hidden">
 		<div class="hidden md:flex flex-col" id="editorPane" style="width: 40%">
 			<Card on:select={tabSelectHandler} {tabs} isCloseable={false} title="Mermaid">
-				<div slot="actions">
-					<div class="flex flex-row items-center">
-						<div class="form-control flex-row items-center">
-							<label class="cursor-pointer label" for="autoSync">
-								<span> Auto sync</span>
-								<input
-									type="checkbox"
-									class="toggle {$stateStore.autoSync ? 'btn-secondary' : 'toggle-primary'} ml-1"
-									id="autoSync"
-									bind:checked={$inputStateStore.autoSync} />
-							</label>
-						</div>
-
-						{#if !$stateStore.autoSync}
-							<button
-								class="btn btn-secondary btn-xs mr-1"
-								title="Sync Diagram ({cmdKey} + Enter)"
-								data-cy="sync"
-								on:click={syncDiagram}><i class="fas fa-sync" /></button>
-						{/if}
-
-						<button class="btn btn-secondary btn-xs" title="View documentation">
-							<a target="_blank" href={docURL} data-cy="docs"><i class="fas fa-book mr-1" />Docs</a>
-						</button>
+				<div slot="actions" class="flex flex-row items-center">
+					<div class="form-control flex-row items-center">
+						<label class="cursor-pointer label" for="autoSync">
+							<span> Auto sync</span>
+							<input
+								type="checkbox"
+								class="toggle {$stateStore.autoSync ? 'btn-secondary' : 'toggle-primary'} ml-1"
+								id="autoSync"
+								bind:checked={$inputStateStore.autoSync} />
+						</label>
 					</div>
+
+					{#if !$stateStore.autoSync}
+						<button
+							class="btn btn-secondary btn-xs mr-1"
+							title="Sync Diagram ({cmdKey} + Enter)"
+							data-cy="sync"
+							on:click={syncDiagram}><i class="fas fa-sync" /></button>
+					{/if}
+
+					<button class="btn btn-secondary btn-xs" title="View documentation">
+						<a target="_blank" href={docURL} data-cy="docs"><i class="fas fa-book mr-1" />Docs</a>
+					</button>
 				</div>
 
-				<Editor on:update={updateHandler} {language} bind:text />
+				<Editor on:update={updateHandler} {language} {text} />
 			</Card>
 
 			<div class="-mt-2">
@@ -177,13 +188,22 @@
 		<div id="resizeHandler" class="hidden md:block" />
 		<div class="flex-1 flex flex-col overflow-hidden">
 			<Card title="Diagram" isCloseable={false}>
-				<a
-					href={`${base}/view#${$stateStore.serialized}`}
-					target="_blank"
-					slot="actions"
-					class="btn btn-secondary btn-xs"
-					title="View diagram in new page"
-					><i class="fas fa-external-link-alt mr-1" />Full screen</a>
+				<div slot="actions" class="flex flex-row items-center">
+					<label class="cursor-pointer label py-0" for="panZoom">
+						<span>Pan & Zoom</span>
+						<input
+							type="checkbox"
+							class="toggle {$stateStore.panZoom ? 'btn-secondary' : 'toggle-primary'} ml-1"
+							id="panZoom"
+							bind:checked={$inputStateStore.panZoom} />
+					</label>
+					<a
+						href={`${base}/view#${$stateStore.serialized}`}
+						target="_blank"
+						class="btn btn-secondary btn-xs"
+						title="View diagram in new page"
+						><i class="fas fa-external-link-alt mr-1" />Full screen</a>
+				</div>
 
 				<div class="flex-1 overflow-auto">
 					<View />

yarn.lock

@@ -4807,6 +4807,11 @@ svelte@3.49.0:
   resolved "https://registry.yarnpkg.com/svelte/-/svelte-3.49.0.tgz#5baee3c672306de1070c3b7888fc2204e36a4029"
   integrity sha512-+lmjic1pApJWDfPCpUUTc1m8azDqYCG1JN9YEngrx/hUyIcFJo6VZhj0A1Ai0wqoHcEIuQy+e9tk+4uDgdtsFA==
 
+svg-pan-zoom@^3.6.1:
+  version "3.6.1"
+  resolved "https://registry.yarnpkg.com/svg-pan-zoom/-/svg-pan-zoom-3.6.1.tgz#f880a1bb32d18e9c625d7715350bebc269b450cf"
+  integrity sha512-JaKkGHHfGvRrcMPdJWkssLBeWqM+Isg/a09H7kgNNajT1cX5AztDTNs+C8UzpCxjCTRrG34WbquwaovZbmSk9g==
+
 svgo@^2.7.0:
   version "2.8.0"
   resolved "https://registry.yarnpkg.com/svgo/-/svgo-2.8.0.tgz#4ff80cce6710dc2795f0c7c74101e6764cfccd24"