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@tldraw/editor

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tldraw infinite canvas SDK (editor).

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{ "version": 3, "sources": ["../../../src/lib/hooks/useGestureEvents.ts"], "sourcesContent": ["import type { AnyHandlerEventTypes, EventTypes, GestureKey, Handler } from '@use-gesture/core/types'\nimport { createUseGesture, pinchAction, wheelAction } from '@use-gesture/react'\nimport * as React from 'react'\nimport { TLWheelEventInfo } from '../editor/types/event-types'\nimport { Vec } from '../primitives/Vec'\nimport { preventDefault, stopEventPropagation } from '../utils/dom'\nimport { isAccelKey } from '../utils/keyboard'\nimport { normalizeWheel } from '../utils/normalizeWheel'\nimport { useEditor } from './useEditor'\n\n/*\n\n# How does pinching work?\n\nThe pinching handler is fired under two circumstances: \n- when a user is on a MacBook trackpad and is ZOOMING with a two-finger pinch\n- when a user is on a touch device and is ZOOMING with a two-finger pinch\n- when a user is on a touch device and is PANNING with two fingers\n\nZooming is much more expensive than panning (because it causes shapes to render), \nso we want to be sure that we don't zoom while two-finger panning. \n\nIn order to do this, we keep track of a \"pinchState\", which is either:\n- \"zooming\"\n- \"panning\"\n- \"not sure\"\n\nIf a user is on a trackpad, the pinchState will be set to \"zooming\". \n\nIf the user is on a touch screen, then we start in the \"not sure\" state and switch back and forth\nbetween \"zooming\", \"panning\", and \"not sure\" based on what the user is doing with their fingers.\n\nIn the \"not sure\" state, we examine whether the user has moved the center of the gesture far enough\nto suggest that they're panning; or else that they've moved their fingers further apart or closer\ntogether enough to suggest that they're zooming. \n\nIn the \"panning\" state, we check whether the user's fingers have moved far enough apart to suggest\nthat they're zooming. If they have, we switch to the \"zooming\" state.\n\nIn the \"zooming\" state, we just stay zooming\u2014it's not YET possible to switch back to panning.\n\ntodo: compare velocities of change in order to determine whether the user has switched back to panning\n*/\n\ntype check<T extends AnyHandlerEventTypes, Key extends GestureKey> = undefined extends T[Key]\n\t? EventTypes[Key]\n\t: T[Key]\ntype PinchHandler = Handler<'pinch', check<EventTypes, 'pinch'>>\n\nconst useGesture = createUseGesture([wheelAction, pinchAction])\n\n/**\n * GOTCHA\n *\n * UseGesture fires a wheel event 140ms after the gesture actually ends, with a momentum-adjusted\n * delta. This creates a messed up interaction where after you stop scrolling suddenly the dang page\n * jumps a tick. why do they do this? you are asking the wrong person. it seems intentional though.\n * anyway we want to ignore that last event, but there's no way to directly detect it so we need to\n * keep track of timestamps. Yes this is awful, I am sorry.\n */\nlet lastWheelTime = undefined as undefined | number\n\nconst isWheelEndEvent = (time: number) => {\n\tif (lastWheelTime === undefined) {\n\t\tlastWheelTime = time\n\t\treturn false\n\t}\n\n\tif (time - lastWheelTime > 120 && time - lastWheelTime < 160) {\n\t\tlastWheelTime = time\n\t\treturn true\n\t}\n\n\tlastWheelTime = time\n\treturn false\n}\n\nexport function useGestureEvents(ref: React.RefObject<HTMLDivElement>) {\n\tconst editor = useEditor()\n\n\tconst events = React.useMemo(() => {\n\t\tlet pinchState = 'not sure' as 'not sure' | 'zooming' | 'panning'\n\n\t\tconst onWheel: Handler<'wheel', WheelEvent> = ({ event }) => {\n\t\t\tif (!editor.getInstanceState().isFocused) {\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\tpinchState = 'not sure'\n\n\t\t\tif (isWheelEndEvent(Date.now())) {\n\t\t\t\t// ignore wheelEnd events\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\t// Awful tht we need to put this logic here, but basically\n\t\t\t// we don't want to handle the the wheel event (or call prevent\n\t\t\t// default on the evnet) if the user is wheeling over an a shape\n\t\t\t// that is scrollable which they're currently editing.\n\n\t\t\tconst editingShapeId = editor.getEditingShapeId()\n\t\t\tif (editingShapeId) {\n\t\t\t\tconst shape = editor.getShape(editingShapeId)\n\t\t\t\tif (shape) {\n\t\t\t\t\tconst util = editor.getShapeUtil(shape)\n\t\t\t\t\tif (util.canScroll(shape)) {\n\t\t\t\t\t\tconst bounds = editor.getShapePageBounds(editingShapeId)\n\t\t\t\t\t\tif (bounds?.containsPoint(editor.inputs.currentPagePoint)) {\n\t\t\t\t\t\t\treturn\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tpreventDefault(event)\n\t\t\tstopEventPropagation(event)\n\t\t\tconst delta = normalizeWheel(event)\n\n\t\t\tif (delta.x === 0 && delta.y === 0) return\n\n\t\t\tconst info: TLWheelEventInfo = {\n\t\t\t\ttype: 'wheel',\n\t\t\t\tname: 'wheel',\n\t\t\t\tdelta,\n\t\t\t\tpoint: new Vec(event.clientX, event.clientY),\n\t\t\t\tshiftKey: event.shiftKey,\n\t\t\t\taltKey: event.altKey,\n\t\t\t\tctrlKey: event.metaKey || event.ctrlKey,\n\t\t\t\tmetaKey: event.metaKey,\n\t\t\t\taccelKey: isAccelKey(event),\n\t\t\t}\n\n\t\t\teditor.dispatch(info)\n\t\t}\n\n\t\tlet initDistanceBetweenFingers = 1 // the distance between the two fingers when the pinch starts\n\t\tlet initZoom = 1 // the browser's zoom level when the pinch starts\n\t\tlet currDistanceBetweenFingers = 0\n\t\tconst initPointBetweenFingers = new Vec()\n\t\tconst prevPointBetweenFingers = new Vec()\n\n\t\tconst onPinchStart: PinchHandler = (gesture) => {\n\t\t\tconst elm = ref.current\n\t\t\tpinchState = 'not sure'\n\n\t\t\tconst { event, origin, da } = gesture\n\n\t\t\tif (event instanceof WheelEvent) return\n\t\t\tif (!(event.target === elm || elm?.contains(event.target as Node))) return\n\n\t\t\tprevPointBetweenFingers.x = origin[0]\n\t\t\tprevPointBetweenFingers.y = origin[1]\n\t\t\tinitPointBetweenFingers.x = origin[0]\n\t\t\tinitPointBetweenFingers.y = origin[1]\n\t\t\tinitDistanceBetweenFingers = da[0]\n\t\t\tinitZoom = editor.getZoomLevel()\n\n\t\t\teditor.dispatch({\n\t\t\t\ttype: 'pinch',\n\t\t\t\tname: 'pinch_start',\n\t\t\t\tpoint: { x: origin[0], y: origin[1], z: editor.getZoomLevel() },\n\t\t\t\tdelta: { x: 0, y: 0 },\n\t\t\t\tshiftKey: event.shiftKey,\n\t\t\t\taltKey: event.altKey,\n\t\t\t\tctrlKey: event.metaKey || event.ctrlKey,\n\t\t\t\tmetaKey: event.metaKey,\n\t\t\t\taccelKey: isAccelKey(event),\n\t\t\t})\n\t\t}\n\n\t\t// let timeout: any\n\t\tconst updatePinchState = (isSafariTrackpadPinch: boolean) => {\n\t\t\tif (isSafariTrackpadPinch) {\n\t\t\t\tpinchState = 'zooming'\n\t\t\t}\n\n\t\t\tif (pinchState === 'zooming') {\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\t// Initial: [touch]-------origin-------[touch]\n\t\t\t// Current: [touch]-----------origin----------[touch]\n\t\t\t// |----| |------------|\n\t\t\t// originDistance ^ ^ touchDistance\n\n\t\t\t// How far have the two touch points moved towards or away from eachother?\n\t\t\tconst touchDistance = Math.abs(currDistanceBetweenFingers - initDistanceBetweenFingers)\n\t\t\t// How far has the point between the touches moved?\n\t\t\tconst originDistance = Vec.Dist(initPointBetweenFingers, prevPointBetweenFingers)\n\n\t\t\tswitch (pinchState) {\n\t\t\t\tcase 'not sure': {\n\t\t\t\t\tif (touchDistance > 24) {\n\t\t\t\t\t\tpinchState = 'zooming'\n\t\t\t\t\t} else if (originDistance > 16) {\n\t\t\t\t\t\tpinchState = 'panning'\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t\tcase 'panning': {\n\t\t\t\t\t// Slightly more touch distance needed to go from panning to zooming\n\t\t\t\t\tif (touchDistance > 64) {\n\t\t\t\t\t\tpinchState = 'zooming'\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst onPinch: PinchHandler = (gesture) => {\n\t\t\tconst elm = ref.current\n\t\t\tconst { event, origin, offset, da } = gesture\n\n\t\t\tif (event instanceof WheelEvent) return\n\t\t\tif (!(event.target === elm || elm?.contains(event.target as Node))) return\n\n\t\t\t// In (desktop) Safari, a two finger trackpad pinch will be a \"gesturechange\" event\n\t\t\t// and will have 0 touches; on iOS, a two-finger pinch will be a \"pointermove\" event\n\t\t\t// with two touches.\n\t\t\tconst isSafariTrackpadPinch =\n\t\t\t\tgesture.type === 'gesturechange' || gesture.type === 'gestureend'\n\n\t\t\t// The distance between the two touch points\n\t\t\tcurrDistanceBetweenFingers = da[0]\n\n\t\t\t// Only update the zoom if the pointers are far enough apart;\n\t\t\t// a very small touchDistance means that the user has probably\n\t\t\t// pinched out and their fingers are touching; this produces\n\t\t\t// very unstable zooming behavior.\n\n\t\t\tconst dx = origin[0] - prevPointBetweenFingers.x\n\t\t\tconst dy = origin[1] - prevPointBetweenFingers.y\n\n\t\t\tprevPointBetweenFingers.x = origin[0]\n\t\t\tprevPointBetweenFingers.y = origin[1]\n\n\t\t\tupdatePinchState(isSafariTrackpadPinch)\n\n\t\t\tswitch (pinchState) {\n\t\t\t\tcase 'zooming': {\n\t\t\t\t\tconst currZoom = offset[0] ** editor.getCameraOptions().zoomSpeed\n\n\t\t\t\t\teditor.dispatch({\n\t\t\t\t\t\ttype: 'pinch',\n\t\t\t\t\t\tname: 'pinch',\n\t\t\t\t\t\tpoint: { x: origin[0], y: origin[1], z: currZoom },\n\t\t\t\t\t\tdelta: { x: dx, y: dy },\n\t\t\t\t\t\tshiftKey: event.shiftKey,\n\t\t\t\t\t\taltKey: event.altKey,\n\t\t\t\t\t\tctrlKey: event.metaKey || event.ctrlKey,\n\t\t\t\t\t\tmetaKey: event.metaKey,\n\t\t\t\t\t\taccelKey: isAccelKey(event),\n\t\t\t\t\t})\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t\tcase 'panning': {\n\t\t\t\t\teditor.dispatch({\n\t\t\t\t\t\ttype: 'pinch',\n\t\t\t\t\t\tname: 'pinch',\n\t\t\t\t\t\tpoint: { x: origin[0], y: origin[1], z: initZoom },\n\t\t\t\t\t\tdelta: { x: dx, y: dy },\n\t\t\t\t\t\tshiftKey: event.shiftKey,\n\t\t\t\t\t\taltKey: event.altKey,\n\t\t\t\t\t\tctrlKey: event.metaKey || event.ctrlKey,\n\t\t\t\t\t\tmetaKey: event.metaKey,\n\t\t\t\t\t\taccelKey: isAccelKey(event),\n\t\t\t\t\t})\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst onPinchEnd: PinchHandler = (gesture) => {\n\t\t\tconst elm = ref.current\n\t\t\tconst { event, origin, offset } = gesture\n\n\t\t\tif (event instanceof WheelEvent) return\n\t\t\tif (!(event.target === elm || elm?.contains(event.target as Node))) return\n\n\t\t\tconst scale = offset[0] ** editor.getCameraOptions().zoomSpeed\n\n\t\t\tpinchState = 'not sure'\n\n\t\t\teditor.timers.requestAnimationFrame(() => {\n\t\t\t\teditor.dispatch({\n\t\t\t\t\ttype: 'pinch',\n\t\t\t\t\tname: 'pinch_end',\n\t\t\t\t\tpoint: { x: origin[0], y: origin[1], z: scale },\n\t\t\t\t\tdelta: { x: origin[0], y: origin[1] },\n\t\t\t\t\tshiftKey: event.shiftKey,\n\t\t\t\t\taltKey: event.altKey,\n\t\t\t\t\tctrlKey: event.metaKey || event.ctrlKey,\n\t\t\t\t\tmetaKey: event.metaKey,\n\t\t\t\t\taccelKey: isAccelKey(event),\n\t\t\t\t})\n\t\t\t})\n\t\t}\n\n\t\treturn {\n\t\t\tonWheel,\n\t\t\tonPinchStart,\n\t\t\tonPinchEnd,\n\t\t\tonPinch,\n\t\t}\n\t}, [editor, ref])\n\n\tuseGesture(events, {\n\t\ttarget: ref,\n\t\teventOptions: { passive: false },\n\t\tpinch: {\n\t\t\tfrom: () => {\n\t\t\t\tconst { zoomSpeed } = editor.getCameraOptions()\n\t\t\t\tconst level = editor.getZoomLevel() ** (1 / zoomSpeed)\n\t\t\t\treturn [level, 0]\n\t\t\t}, // Return the camera z to use when pinch starts\n\t\t\tscaleBounds: () => {\n\t\t\t\tconst baseZoom = editor.getBaseZoom()\n\t\t\t\tconst { zoomSteps, zoomSpeed } = editor.getCameraOptions()\n\t\t\t\tconst zoomMin = zoomSteps[0] * baseZoom\n\t\t\t\tconst zoomMax = zoomSteps[zoomSteps.length - 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