51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
//@ts-nocheck
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// Reasonable defaults
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var PIXEL_STEP = 10;
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var LINE_HEIGHT = 40;
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var PAGE_HEIGHT = 800;
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export default function normalizeWheel(/*object*/ event) /*object*/ {
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var sX = 0, sY = 0, // spinX, spinY
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pX = 0, pY = 0; // pixelX, pixelY
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// Legacy
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if ('detail' in event) { sY = event.detail; }
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if ('wheelDelta' in event) { sY = -event.wheelDelta / 120; }
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if ('wheelDeltaY' in event) { sY = -event.wheelDeltaY / 120; }
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if ('wheelDeltaX' in event) { sX = -event.wheelDeltaX / 120; }
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// side scrolling on FF with DOMMouseScroll
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if ('axis' in event && event.axis === event.HORIZONTAL_AXIS) {
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sX = sY;
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sY = 0;
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}
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pX = sX * PIXEL_STEP;
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pY = sY * PIXEL_STEP;
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if ('deltaY' in event) { pY = event.deltaY; }
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if ('deltaX' in event) { pX = event.deltaX; }
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if ((pX || pY) && event.deltaMode) {
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if (event.deltaMode == 1) { // delta in LINE units
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pX *= LINE_HEIGHT;
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pY *= LINE_HEIGHT;
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} else { // delta in PAGE units
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pX *= PAGE_HEIGHT;
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pY *= PAGE_HEIGHT;
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}
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}
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// Fall-back if spin cannot be determined
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if (pX && !sX) { sX = (pX < 1) ? -1 : 1; }
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if (pY && !sY) { sY = (pY < 1) ? -1 : 1; }
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return {
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spinX: sX,
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spinY: sY,
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pixelX: pX,
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pixelY: pY
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};
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}
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