kopia lustrzana https://github.com/Tldraw/Tldraw
70 wiersze
2.2 KiB
TypeScript
70 wiersze
2.2 KiB
TypeScript
import { COARSE_POINTER_WIDTH, EDGE_SCROLL_DISTANCE, EDGE_SCROLL_SPEED } from '../constants'
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import { Editor } from '../editor/Editor'
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import { Vec } from '../primitives/Vec'
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/**
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* Helper function to get the scroll proximity factor for a given position.
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* @param position - The mouse position on the axis.
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* @param dimension - The component dimension on the axis.
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* @internal
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*/
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function getEdgeProximityFactor(
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position: number,
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dimension: number,
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isCoarse: boolean,
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insetStart: boolean,
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insetEnd: boolean
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) {
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const dist = EDGE_SCROLL_DISTANCE
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const pw = isCoarse ? COARSE_POINTER_WIDTH : 0 // pointer width
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const pMin = position - pw
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const pMax = position + pw
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const min = insetStart ? 0 : dist
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const max = insetEnd ? dimension : dimension - dist
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if (pMin < min) {
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return Math.min(1, (min - pMin) / dist)
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} else if (pMax > max) {
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return -Math.min(1, (pMax - max) / dist)
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}
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return 0
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}
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/**
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* Moves the camera when the mouse is close to the edge of the screen.
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* @public
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*/
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export function moveCameraWhenCloseToEdge(editor: Editor) {
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if (!editor.inputs.isDragging || editor.inputs.isPanning || editor.getCameraOptions().isLocked)
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return
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const {
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inputs: {
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currentScreenPoint: { x, y },
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},
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} = editor
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const zoomLevel = editor.getZoomLevel()
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const screenBounds = editor.getViewportScreenBounds()
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// Determines how much the speed is affected by the screen size
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const screenSizeFactorX = screenBounds.w < 1000 ? 0.612 : 1
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const screenSizeFactorY = screenBounds.h < 1000 ? 0.612 : 1
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const {
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isCoarsePointer,
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insets: [t, r, b, l],
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} = editor.getInstanceState()
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const proximityFactorX = getEdgeProximityFactor(x, screenBounds.w, isCoarsePointer, l, r)
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const proximityFactorY = getEdgeProximityFactor(y, screenBounds.h, isCoarsePointer, t, b)
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if (proximityFactorX === 0 && proximityFactorY === 0) return
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// Determines the base speed of the scroll
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const pxSpeed = editor.user.getEdgeScrollSpeed() * EDGE_SCROLL_SPEED
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const scrollDeltaX = (pxSpeed * proximityFactorX * screenSizeFactorX) / zoomLevel
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const scrollDeltaY = (pxSpeed * proximityFactorY * screenSizeFactorY) / zoomLevel
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const camera = editor.getCamera()
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editor.setCamera(new Vec(camera.x + scrollDeltaX, camera.y + scrollDeltaY, camera.z))
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}
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