[fix] Fixes off-center bugs (#101)

* moves center from window center to center of element

* Removes onMount in Renderer, adds onBoundsChange

* Fix centered-g css

* Fix zoom to fit

packages/core/src/components/page/page.tsx

@@ -34,7 +34,7 @@ export function Page<T extends TLShape, M extends Record<string, unknown>>({
     page,
     pageState,
     shapeUtils,
-    inputs.size,
+    [inputs.bounds.width, inputs.bounds.height],
     meta,
     callbacks.onRenderCountChange
   )
@@ -59,7 +59,7 @@ export function Page<T extends TLShape, M extends Record<string, unknown>>({
         <Bounds
           zoom={zoom}
           bounds={bounds}
-          viewportWidth={inputs.size[0]}
+          viewportWidth={inputs.bounds.width}
           isLocked={isLocked}
           rotation={rotation}
         />

packages/core/src/components/renderer/renderer.tsx

@@ -56,9 +56,13 @@ export interface RendererProps<T extends TLShape, E extends Element = any, M = a
    */
   meta?: M
   /**
-   * A callback that receives the renderer's inputs manager.
+   * (optional) A callback that receives the renderer's inputs manager.
    */
   onMount?: (inputs: Inputs) => void
+  /**
+   * (optional) A callback that is fired when the editor's client bounding box changes.
+   */
+  onBoundsChange?: (bounds: TLBounds) => void
 }
 
 /**
@@ -83,7 +87,7 @@ export function Renderer<T extends TLShape, E extends Element, M extends Record<
 }: RendererProps<T, E, M>): JSX.Element {
   useTLTheme(theme)
 
-  const rScreenBounds = React.useRef<TLBounds>(null)
+  const rSelectionBounds = React.useRef<TLBounds>(null)
 
   const rPageState = React.useRef<TLPageState>(pageState)
 
@@ -96,7 +100,7 @@ export function Renderer<T extends TLShape, E extends Element, M extends Record<
   const [context] = React.useState<TLContextType<T, E, M>>(() => ({
     callbacks: rest,
     shapeUtils,
-    rScreenBounds,
+    rSelectionBounds,
     rPageState,
     inputs: new Inputs(),
   }))

packages/core/src/hooks/useCameraCss.tsx

@@ -15,17 +15,5 @@ export function useCameraCss(ref: React.RefObject<HTMLDivElement>, pageState: TL
     ref.current!.style.setProperty('--tl-camera-y', pageState.camera.point[1] + 'px')
   }, [pageState.camera.point])
 
-  // Update the group's position when the camera moves or zooms
-  // React.useEffect(() => {
-  //   const {
-  //     zoom,
-  //     point: [x = 0, y = 0],
-  //   } = pageState.camera
-  //   rLayer.current?.style.setProperty(
-  //     'transform',
-  //     `scale(${zoom},${zoom}) translate(${x}px,${y}px)`
-  //   )
-  // }, [pageState.camera])
-
   return rLayer
 }

packages/core/src/hooks/usePosition.ts

@@ -5,11 +5,18 @@ import type { TLBounds } from '+types'
 export function usePosition(bounds: TLBounds, rotation = 0) {
   const rBounds = React.useRef<HTMLDivElement>(null)
 
+  // Update the transform
   React.useLayoutEffect(() => {
     const elm = rBounds.current!
+
     const transform = `
-    translate(calc(${bounds.minX}px - var(--tl-padding)),calc(${bounds.minY}px - var(--tl-padding)))
+    translate3d(
+      calc(${bounds.minX}px - var(--tl-padding)),
+      calc(${bounds.minY}px - var(--tl-padding)), 
+      0px
+    )
     rotate(${rotation + (bounds.rotation || 0)}rad)`
+
     elm.style.setProperty('transform', transform)
 
     elm.style.setProperty('width', `calc(${Math.floor(bounds.width)}px + (var(--tl-padding) * 2))`)

packages/core/src/hooks/useResizeObserver.ts

@@ -3,31 +3,48 @@ import * as React from 'react'
 import { Utils } from '+utils'
 
 export function useResizeObserver<T extends Element>(ref: React.RefObject<T>) {
-  const { inputs } = useTLContext()
+  const { inputs, callbacks } = useTLContext()
+
   const rIsMounted = React.useRef(false)
+
   const forceUpdate = React.useReducer((x) => x + 1, 0)[1]
 
-  const updateOffsets = React.useCallback(() => {
+  // When the element resizes, update the bounds (stored in inputs)
+  // and broadcast via the onBoundsChange callback prop.
+  const updateBounds = React.useCallback(() => {
     if (rIsMounted.current) {
       const rect = ref.current?.getBoundingClientRect()
+
       if (rect) {
-        inputs.offset = [rect.left, rect.top]
-        inputs.size = [rect.width, rect.height]
+        inputs.bounds = {
+          minX: rect.left,
+          maxX: rect.left + rect.width,
+          minY: rect.top,
+          maxY: rect.top + rect.height,
+          width: rect.width,
+          height: rect.height,
+        }
+
+        callbacks.onBoundsChange?.(inputs.bounds)
+
+        // Force an update for a second mount
         forceUpdate()
       }
+    } else {
+      // Skip the first mount
+      rIsMounted.current = true
     }
-    rIsMounted.current = true
-  }, [ref, forceUpdate])
+  }, [ref, forceUpdate, inputs, callbacks.onBoundsChange])
 
   React.useEffect(() => {
-    const debouncedUpdateOffsets = Utils.debounce(updateOffsets, 100)
-    window.addEventListener('scroll', debouncedUpdateOffsets)
-    window.addEventListener('resize', debouncedUpdateOffsets)
+    const debouncedupdateBounds = Utils.debounce(updateBounds, 100)
+    window.addEventListener('scroll', debouncedupdateBounds)
+    window.addEventListener('resize', debouncedupdateBounds)
     return () => {
-      window.removeEventListener('scroll', debouncedUpdateOffsets)
-      window.removeEventListener('resize', debouncedUpdateOffsets)
+      window.removeEventListener('scroll', debouncedupdateBounds)
+      window.removeEventListener('resize', debouncedupdateBounds)
     }
-  }, [inputs])
+  }, [])
 
   React.useEffect(() => {
     const resizeObserver = new ResizeObserver((entries) => {
@@ -36,7 +53,7 @@ export function useResizeObserver<T extends Element>(ref: React.RefObject<T>) {
       }
 
       if (entries[0].contentRect) {
-        updateOffsets()
+        updateBounds()
       }
     })
 
@@ -50,6 +67,6 @@ export function useResizeObserver<T extends Element>(ref: React.RefObject<T>) {
   }, [ref, inputs])
 
   React.useEffect(() => {
-    updateOffsets()
+    updateBounds()
   }, [ref])
 }

packages/core/src/hooks/useSelection.tsx

@@ -11,7 +11,7 @@ export function useSelection<T extends TLShape, E extends Element>(
   pageState: TLPageState,
   shapeUtils: TLShapeUtils<T, E>
 ) {
-  const { rScreenBounds } = useTLContext()
+  const { rSelectionBounds } = useTLContext()
   const { selectedIds } = pageState
 
   let bounds: TLBounds | undefined = undefined
@@ -50,7 +50,7 @@ export function useSelection<T extends TLShape, E extends Element>(
     const [minX, minY] = canvasToScreen([bounds.minX, bounds.minY], pageState.camera)
     const [maxX, maxY] = canvasToScreen([bounds.maxX, bounds.maxY], pageState.camera)
 
-    rScreenBounds.current = {
+    rSelectionBounds.current = {
       minX,
       minY,
       maxX,
@@ -59,7 +59,7 @@ export function useSelection<T extends TLShape, E extends Element>(
       height: maxY - minY,
     }
   } else {
-    rScreenBounds.current = null
+    rSelectionBounds.current = null
   }
 
   return { bounds, rotation, isLocked }

packages/core/src/hooks/useShapeEvents.tsx

@@ -3,7 +3,7 @@ import { Utils } from '+utils'
 import { TLContext } from '+hooks'
 
 export function useShapeEvents(id: string, disable = false) {
-  const { rPageState, rScreenBounds, callbacks, inputs } = React.useContext(TLContext)
+  const { rPageState, rSelectionBounds, callbacks, inputs } = React.useContext(TLContext)
 
   const onPointerDown = React.useCallback(
     (e: React.PointerEvent) => {
@@ -26,8 +26,8 @@ export function useShapeEvents(id: string, disable = false) {
       // treat the event as a bounding box click. Unfortunately there's no way I know to pipe
       // the event to the actual bounds background element.
       if (
-        rScreenBounds.current &&
-        Utils.pointInBounds(info.point, rScreenBounds.current) &&
+        rSelectionBounds.current &&
+        Utils.pointInBounds(info.point, rSelectionBounds.current) &&
         !rPageState.current.selectedIds.includes(id)
       ) {
         callbacks.onPointBounds?.(inputs.pointerDown(e, 'bounds'), e)

packages/core/src/hooks/useStyle.tsx

@@ -151,8 +151,7 @@ const tlcss = css`
     height: 0;
     width: 0;
     contain: layout size;
-    transform: scale(var(--tl-zoom), var(--tl-zoom))
-      translate(var(--tl-camera-x), var(--tl-camera-y));
+    transform: scale(var(--tl-zoom)) translate3d(var(--tl-camera-x), var(--tl-camera-y), 0px);
   }
 
   .tl-absolute {

packages/core/src/hooks/useTLContext.tsx

@@ -2,12 +2,13 @@ import * as React from 'react'
 import type { Inputs } from '+inputs'
 import type { TLCallbacks, TLShape, TLBounds, TLPageState, TLShapeUtils } from '+types'
 
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 export interface TLContextType<T extends TLShape, E extends Element, M = any> {
   id?: string
   callbacks: Partial<TLCallbacks<T>>
   shapeUtils: TLShapeUtils<T, E, M>
   rPageState: React.MutableRefObject<TLPageState>
-  rScreenBounds: React.MutableRefObject<TLBounds | null>
+  rSelectionBounds: React.MutableRefObject<TLBounds | null>
   inputs: Inputs
 }
 

packages/core/src/inputs.ts

@@ -2,17 +2,27 @@ import type React from 'react'
 import type { TLKeyboardInfo, TLPointerInfo } from './types'
 import { Utils } from './utils'
 import { Vec } from '@tldraw/vec'
+import type { TLBounds } from '+index'
 
 const DOUBLE_CLICK_DURATION = 250
 
 export class Inputs {
   pointer?: TLPointerInfo<string>
+
   keyboard?: TLKeyboardInfo
+
   keys: Record<string, boolean> = {}
+
   isPinching = false
 
-  offset = [0, 0]
-  size = [10, 10]
+  bounds: TLBounds = {
+    minX: 0,
+    maxX: 640,
+    minY: 0,
+    maxY: 480,
+    width: 640,
+    height: 480,
+  }
 
   pointerUpTime = 0
 
@@ -41,9 +51,9 @@ export class Inputs {
     const info: TLPointerInfo<T> = {
       target,
       pointerId: touch.identifier,
-      origin: Inputs.getPoint(touch),
+      origin: Inputs.getPoint(touch, this.bounds),
       delta: [0, 0],
-      point: Inputs.getPoint(touch),
+      point: Inputs.getPoint(touch, this.bounds),
       pressure: Inputs.getPressure(touch),
       shiftKey,
       ctrlKey,
@@ -64,9 +74,9 @@ export class Inputs {
     const info: TLPointerInfo<T> = {
       target,
       pointerId: touch.identifier,
-      origin: Inputs.getPoint(touch),
+      origin: Inputs.getPoint(touch, this.bounds),
       delta: [0, 0],
-      point: Inputs.getPoint(touch),
+      point: Inputs.getPoint(touch, this.bounds),
       pressure: Inputs.getPressure(touch),
       shiftKey,
       ctrlKey,
@@ -88,7 +98,7 @@ export class Inputs {
 
     const prev = this.pointer
 
-    const point = Inputs.getPoint(touch)
+    const point = Inputs.getPoint(touch, this.bounds)
 
     const delta = prev?.point ? Vec.sub(point, prev.point) : [0, 0]
 
@@ -114,7 +124,7 @@ export class Inputs {
   pointerDown<T extends string>(e: PointerEvent | React.PointerEvent, target: T): TLPointerInfo<T> {
     const { shiftKey, ctrlKey, metaKey, altKey } = e
 
-    const point = Inputs.getPoint(e, this.offset)
+    const point = Inputs.getPoint(e, this.bounds)
 
     this.activePointer = e.pointerId
 
@@ -142,7 +152,7 @@ export class Inputs {
   ): TLPointerInfo<T> {
     const { shiftKey, ctrlKey, metaKey, altKey } = e
 
-    const point = Inputs.getPoint(e, this.offset)
+    const point = Inputs.getPoint(e, this.bounds)
 
     const info: TLPointerInfo<T> = {
       target,
@@ -167,7 +177,7 @@ export class Inputs {
 
     const prev = this.pointer
 
-    const point = Inputs.getPoint(e, this.offset)
+    const point = Inputs.getPoint(e, this.bounds)
 
     const delta = prev?.point ? Vec.sub(point, prev.point) : [0, 0]
 
@@ -195,7 +205,7 @@ export class Inputs {
 
     const prev = this.pointer
 
-    const point = Inputs.getPoint(e, this.offset)
+    const point = Inputs.getPoint(e, this.bounds)
 
     const delta = prev?.point ? Vec.sub(point, prev.point) : [0, 0]
 
@@ -231,7 +241,7 @@ export class Inputs {
       origin: this.pointer?.origin || [0, 0],
       delta: [0, 0],
       pressure: 0.5,
-      point: Inputs.getPoint(e, this.offset),
+      point: Inputs.getPoint(e, this.bounds),
       shiftKey,
       ctrlKey,
       metaKey,
@@ -252,7 +262,7 @@ export class Inputs {
 
     const prev = this.pointer
 
-    const point = Inputs.getPoint(e, this.offset)
+    const point = Inputs.getPoint(e, this.bounds)
 
     const info: TLPointerInfo<'wheel'> = {
       ...prev,
@@ -330,7 +340,7 @@ export class Inputs {
       target: 'pinch',
       origin,
       delta: delta,
-      point: Vec.sub(Vec.round(point), this.offset),
+      point: Vec.sub(Vec.round(point), [this.bounds.minX, this.bounds.minY]),
       pressure: 0.5,
       shiftKey,
       ctrlKey,
@@ -353,9 +363,9 @@ export class Inputs {
 
   static getPoint(
     e: PointerEvent | React.PointerEvent | Touch | React.Touch | WheelEvent,
-    offset = [0, 0]
+    bounds: TLBounds
   ): number[] {
-    return [+e.clientX.toFixed(2) - offset[0], +e.clientY.toFixed(2) - offset[1]]
+    return [+e.clientX.toFixed(2) - bounds.minX, +e.clientY.toFixed(2) - bounds.minY]
   }
 
   static getPressure(e: PointerEvent | React.PointerEvent | Touch | React.Touch | WheelEvent) {

packages/core/src/test/context-wrapper.tsx

@@ -7,13 +7,13 @@ import { Inputs } from '+inputs'
 
 export const ContextWrapper: React.FC = ({ children }) => {
   useTLTheme()
-  const rScreenBounds = React.useRef<TLBounds>(null)
+  const rSelectionBounds = React.useRef<TLBounds>(null)
   const rPageState = React.useRef<TLPageState>(mockDocument.pageState)
 
   const [context] = React.useState(() => ({
     callbacks: {},
     shapeUtils: mockUtils,
-    rScreenBounds,
+    rSelectionBounds,
     rPageState,
     inputs: new Inputs(),
   }))

packages/core/src/types.ts

@@ -205,6 +205,7 @@ export interface TLCallbacks<T extends TLShape> {
   onShapeBlur: TLShapeBlurHandler<any>
   onRenderCountChange: (ids: string[]) => void
   onError: (error: Error) => void
+  onBoundsChange: (bounds: TLBounds) => void
 }
 
 export interface TLBounds {

packages/tldraw/src/components/tldraw/tldraw.tsx

@@ -220,7 +220,7 @@ function InnerTldraw({
           onRenderCountChange={tlstate.onRenderCountChange}
           onShapeChange={tlstate.onShapeChange}
           onShapeBlur={tlstate.onShapeBlur}
-          onMount={tlstate.handleMount}
+          onBoundsChange={tlstate.updateBounds}
         />
       </ContextMenu>
       <div className={menuButtons()}>

packages/tldraw/src/state/tldr.ts

@@ -33,20 +33,6 @@ export class TLDR {
     return Vec.sub(Vec.div(point, camera.zoom), camera.point)
   }
 
-  static getViewport(data: Data): TLBounds {
-    const [minX, minY] = TLDR.screenToWorld(data, [0, 0])
-    const [maxX, maxY] = TLDR.screenToWorld(data, [window.innerWidth, window.innerHeight])
-
-    return {
-      minX,
-      minY,
-      maxX,
-      maxY,
-      height: maxX - minX,
-      width: maxY - minY,
-    }
-  }
-
   static getCameraZoom(zoom: number) {
     return Utils.clamp(zoom, 0.1, 5)
   }

packages/tldraw/src/state/tlstate.ts

@@ -119,6 +119,16 @@ export class TLDrawState extends StateManager<Data> {
 
   selectedGroupId?: string
 
+  // The editor's bounding client rect
+  bounds: TLBounds = {
+    minX: 0,
+    minY: 0,
+    maxX: 640,
+    maxY: 480,
+    width: 640,
+    height: 480,
+  }
+
   private pasteInfo = {
     center: [0, 0],
     offset: [0, 0],
@@ -354,6 +364,14 @@ export class TLDrawState extends StateManager<Data> {
     this.inputs = inputs
   }
 
+  /**
+   * Update the bounding box when the renderer's bounds change.
+   * @param bounds
+   */
+  updateBounds = (bounds: TLBounds) => {
+    this.bounds = { ...bounds }
+  }
+
   /* -------------------------------------------------- */
   /*                    Settings & UI                   */
   /* -------------------------------------------------- */
@@ -861,14 +879,7 @@ export class TLDrawState extends StateManager<Data> {
 
       const commonBounds = Utils.getCommonBounds(shapesToPaste.map(TLDR.getBounds))
 
-      let center = Vec.round(
-        this.getPagePoint(
-          point ||
-            (this.inputs
-              ? [this.inputs.size[0] / 2, this.inputs.size[1] / 2]
-              : [window.innerWidth / 2, window.innerHeight / 2])
-        )
-      )
+      let center = Vec.round(this.getPagePoint(point || this.centerPoint))
 
       if (
         Vec.dist(center, this.pasteInfo.center) < 2 ||
@@ -914,10 +925,7 @@ export class TLDrawState extends StateManager<Data> {
             type: TLDrawShapeType.Text,
             parentId: this.appState.currentPageId,
             text: result,
-            point: this.getPagePoint(
-              [window.innerWidth / 2, window.innerHeight / 2],
-              this.currentPageId
-            ),
+            point: this.getPagePoint(this.centerPoint, this.currentPageId),
             style: { ...this.appState.currentStyle },
           })
 
@@ -1030,11 +1038,7 @@ export class TLDrawState extends StateManager<Data> {
    * Reset the camera to the default position
    */
   resetCamera = (): this => {
-    return this.setCamera(
-      Vec.round([window.innerWidth / 2, window.innerHeight / 2]),
-      1,
-      `reset_camera`
-    )
+    return this.setCamera(this.centerPoint, 1, `reset_camera`)
   }
 
   /**
@@ -1066,7 +1070,7 @@ export class TLDrawState extends StateManager<Data> {
    * @param next The new zoom level.
    * @param center The point to zoom towards (defaults to screen center).
    */
-  zoomTo = (next: number, center = [window.innerWidth / 2, window.innerHeight / 2]): this => {
+  zoomTo = (next: number, center = this.centerPoint): this => {
     const { zoom, point } = this.pageState.camera
     const p0 = Vec.sub(Vec.div(center, zoom), point)
     const p1 = Vec.sub(Vec.div(center, next), point)
@@ -1102,13 +1106,13 @@ export class TLDrawState extends StateManager<Data> {
     const bounds = Utils.getCommonBounds(Object.values(shapes).map(TLDR.getBounds))
 
     const zoom = TLDR.getCameraZoom(
-      window.innerWidth < window.innerHeight
-        ? (window.innerWidth - 128) / bounds.width
-        : (window.innerHeight - 128) / bounds.height
+      this.bounds.width < this.bounds.height
+        ? (this.bounds.width - 128) / bounds.width
+        : (this.bounds.height - 128) / bounds.height
     )
 
-    const mx = (window.innerWidth - bounds.width * zoom) / 2 / zoom
-    const my = (window.innerHeight - bounds.height * zoom) / 2 / zoom
+    const mx = (this.bounds.width - bounds.width * zoom) / 2 / zoom
+    const my = (this.bounds.height - bounds.height * zoom) / 2 / zoom
 
     return this.setCamera(
       Vec.round(Vec.add([-bounds.minX, -bounds.minY], [mx, my])),
@@ -1126,13 +1130,13 @@ export class TLDrawState extends StateManager<Data> {
     const bounds = TLDR.getSelectedBounds(this.state)
 
     const zoom = TLDR.getCameraZoom(
-      window.innerWidth < window.innerHeight
-        ? (window.innerWidth - 128) / bounds.width
-        : (window.innerHeight - 128) / bounds.height
+      this.bounds.width < this.bounds.height
+        ? (this.bounds.width - 128) / bounds.width
+        : (this.bounds.height - 128) / bounds.height
     )
 
-    const mx = (window.innerWidth - bounds.width * zoom) / 2 / zoom
-    const my = (window.innerHeight - bounds.height * zoom) / 2 / zoom
+    const mx = (this.bounds.width - bounds.width * zoom) / 2 / zoom
+    const my = (this.bounds.height - bounds.height * zoom) / 2 / zoom
 
     return this.setCamera(
       Vec.round(Vec.add([-bounds.minX, -bounds.minY], [mx, my])),
@@ -1153,8 +1157,8 @@ export class TLDrawState extends StateManager<Data> {
     const bounds = Utils.getCommonBounds(Object.values(shapes).map(TLDR.getBounds))
 
     const { zoom } = pageState.camera
-    const mx = (window.innerWidth - bounds.width * zoom) / 2 / zoom
-    const my = (window.innerHeight - bounds.height * zoom) / 2 / zoom
+    const mx = (this.bounds.width - bounds.width * zoom) / 2 / zoom
+    const my = (this.bounds.height - bounds.height * zoom) / 2 / zoom
 
     return this.setCamera(
       Vec.round(Vec.add([-bounds.minX, -bounds.minY], [mx, my])),
@@ -2813,4 +2817,8 @@ export class TLDrawState extends StateManager<Data> {
   onError = () => {
     // TODO
   }
+
+  get centerPoint() {
+    return Vec.round(Utils.getBoundsCenter(this.bounds))
+  }
 }