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77 lines
2.1 KiB
77 lines
2.1 KiB
using Connected.Enums;
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using Microsoft.AspNetCore.Components.Web;
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using System.Reflection.Metadata.Ecma335;
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namespace Connected.Utilities;
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public static class TouchGestures
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{
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public static TouchGesture GetTouchGesture(TouchPoint[] TouchPoints, DateTime GestureStart)
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{
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try
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{
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if (TouchPoints is not null)
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{
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/* handling tap
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* TouchPoints --> array with one point inside suggesting user tapped the screen
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*/
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if (TouchPoints.Length == 1)
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{
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var point = TouchPoints[0];
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return TouchGesture.Tap;
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}
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/* handling swipe with one finger
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* TouchPoints --> array of exactly two points start and end point, suggesting one finger was used and dragged across the screen
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*/
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if (TouchPoints.Length == 2)
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{
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var startPoint = TouchPoints[0];
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var endPoint = TouchPoints[1];
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const double swipeThreshold = 0.8;
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var diffX = startPoint.ClientX - endPoint.ClientX;
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var diffY = startPoint.ClientY - endPoint.ClientY;
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var diffTime = DateTime.Now - GestureStart;
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var velocityX = Math.Abs(diffX / diffTime.Milliseconds);
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var velocityY = Math.Abs(diffY / diffTime.Milliseconds);
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//dismiss touch gestures if user slowly touched the screen, preventing accidental or unwanted touches
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if (velocityX < swipeThreshold && velocityY < swipeThreshold)
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return TouchGesture.None;
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//preventing false gesture detection if the swipe is too diagonal
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if (Math.Abs(velocityX - velocityY) < 0.5)
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return TouchGesture.None;
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if (velocityX >= swipeThreshold)
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{
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if (diffX < 0)
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return TouchGesture.SwipeRight;
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else
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return TouchGesture.SwipeLeft;
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}
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if (velocityY >= swipeThreshold)
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{
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if (diffX < 0)
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return TouchGesture.SwipeUp;
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else
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return TouchGesture.SwipeDown;
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}
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}
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/* handling zoom, pinch, mutifinger swipe
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* TouchPoints --> array of more than 2 points, suggesting two or more fingers were used to make a gesture
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*/
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if (TouchPoints.Length > 2)
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{
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//TODO
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}
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}
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return TouchGesture.None;
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}
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catch
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{
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return TouchGesture.None;
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}
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}
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}
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