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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| import memoize from 'lodash/function/memoize'; | ||
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| export const isFirefox = memoize(() => | ||
| /firefox/i.test(navigator.userAgent) | ||
| ); | ||
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| export const isSafari = memoize(() => | ||
| Boolean(window.safari) | ||
| ); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| export function isUrlDataTransfer(dataTransfer) { | ||
| var types = Array.prototype.slice.call(dataTransfer.types); | ||
| return types.indexOf('Url') > -1 || types.indexOf('text/uri-list') > -1; | ||
| } | ||
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| export function isFileDataTransfer(dataTransfer) { | ||
| var types = Array.prototype.slice.call(dataTransfer.types); | ||
| return types.indexOf('Files') > -1; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| import { isSafari, isFirefox } from './BrowserDetector'; | ||
| import createMonotonicInterpolant from './createMonotonicInterpolant'; | ||
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| const ELEMENT_NODE = 1; | ||
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| export function getElementRect(el) { | ||
| if (el.nodeType !== ELEMENT_NODE) { | ||
| el = el.parentElement; | ||
| } | ||
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| if (!el) { | ||
| return null; | ||
| } | ||
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| const { top, left, width, height } = el.getBoundingClientRect(); | ||
| return { top, left, width, height }; | ||
| } | ||
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| export function getMouseEventOffsets(e, sourceNode, dragPreview) { | ||
| const dragPreviewNode = dragPreview instanceof Image ? | ||
| sourceNode : | ||
| dragPreview; | ||
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| const sourceNodeRect = sourceNode.getBoundingClientRect(); | ||
| const dragPreviewNodeRect = dragPreviewNode.getBoundingClientRect(); | ||
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| const offsetFromClient = { | ||
| x: e.clientX, | ||
| y: e.clientY | ||
| }; | ||
| const offsetFromDragPreview = { | ||
| x: e.clientX - dragPreviewNodeRect.left, | ||
| y: e.clientY - dragPreviewNodeRect.top | ||
| }; | ||
| const offsetFromSource = { | ||
| x: e.clientX - sourceNodeRect.left, | ||
| y: e.clientY - sourceNodeRect.top | ||
| }; | ||
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| return { offsetFromClient, offsetFromSource, offsetFromDragPreview }; | ||
| } | ||
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| export function getDragPreviewOffset(sourceNode, dragPreview, offsetFromDragPreview, anchorPoint) { | ||
| const { offsetWidth: sourceWidth, offsetHeight: sourceHeight } = sourceNode; | ||
| const { anchorX, anchorY } = anchorPoint; | ||
| const isImage = dragPreview instanceof Image; | ||
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| let dragPreviewWidth = isImage ? dragPreview.width : sourceWidth; | ||
| let dragPreviewHeight = isImage ? dragPreview.height : sourceHeight; | ||
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| // Work around @2x coordinate discrepancies in browsers | ||
| if (isSafari() && isImage) { | ||
| dragPreviewHeight /= window.devicePixelRatio; | ||
| dragPreviewWidth /= window.devicePixelRatio; | ||
| } else if (isFirefox() && !isImage) { | ||
| dragPreviewHeight *= window.devicePixelRatio; | ||
| dragPreviewWidth *= window.devicePixelRatio; | ||
| } | ||
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| // Interpolate coordinates depending on anchor point | ||
| // If you know a simpler way to do this, let me know | ||
| var interpolateX = createMonotonicInterpolant([0, 0.5, 1], [ | ||
| // Dock to the left | ||
| offsetFromDragPreview.x, | ||
| // Align at the center | ||
| (offsetFromDragPreview.x / sourceWidth) * dragPreviewWidth, | ||
| // Dock to the right | ||
| offsetFromDragPreview.x + dragPreviewWidth - sourceWidth | ||
| ]); | ||
| var interpolateY = createMonotonicInterpolant([0, 0.5, 1], [ | ||
| // Dock to the top | ||
| offsetFromDragPreview.y, | ||
| // Align at the center | ||
| (offsetFromDragPreview.y / sourceHeight) * dragPreviewHeight, | ||
| // Dock to the right | ||
| offsetFromDragPreview.y + dragPreviewHeight - sourceHeight | ||
| ]); | ||
| let x = interpolateX(anchorX); | ||
| let y = interpolateY(anchorY); | ||
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| // Work around Safari 8 positioning bug | ||
| if (isSafari() && isImage) { | ||
| // We'll have to wait for @3x to see if this is entirely correct | ||
| y += (window.devicePixelRatio - 1) * dragPreviewHeight; | ||
| } | ||
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| return { x, y }; | ||
| } |