diff options
Diffstat (limited to 'src/client/util/InteractionUtils.ts')
| -rw-r--r-- | src/client/util/InteractionUtils.ts | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/src/client/util/InteractionUtils.ts b/src/client/util/InteractionUtils.ts index 0c3de66ed..2e4e8c7ca 100644 --- a/src/client/util/InteractionUtils.ts +++ b/src/client/util/InteractionUtils.ts @@ -8,6 +8,17 @@ export namespace InteractionUtils { const REACT_POINTER_PEN_BUTTON = 0; const ERASER_BUTTON = 5; + export function GetMyTargetTouches(e: TouchEvent | React.TouchEvent, prevPoints: Map<number, React.Touch>): React.Touch[] { + const myTouches = new Array<React.Touch>(); + for (let i = 0; i < e.targetTouches.length; i++) { + const pt = e.targetTouches.item(i); + if (pt && prevPoints.has(pt.identifier)) { + myTouches.push(pt); + } + } + return myTouches; + } + export function IsType(e: PointerEvent | React.PointerEvent, type: string): boolean { switch (type) { // pen and eraser are both pointer type 'pen', but pen is button 0 and eraser is button 5. -syip2 @@ -79,6 +90,20 @@ export namespace InteractionUtils { return 0; } + export function IsDragging(oldTouches: Map<number, React.Touch>, newTouches: React.Touch[], leniency: number): boolean { + for (const touch of newTouches) { + if (touch) { + const oldTouch = oldTouches.get(touch.identifier); + if (oldTouch) { + if (TwoPointEuclidist(touch, oldTouch) >= leniency) { + return true; + } + } + } + } + return false; + } + // These might not be very useful anymore, but I'll leave them here for now -syip2 { @@ -134,20 +159,5 @@ export namespace InteractionUtils { // return { type: undefined }; // } // } - - // export function IsDragging(oldTouches: Map<number, React.Touch>, newTouches: TouchList, leniency: number): boolean { - // for (let i = 0; i < newTouches.length; i++) { - // let touch = newTouches.item(i); - // if (touch) { - // let oldTouch = oldTouches.get(touch.identifier); - // if (oldTouch) { - // if (TwoPointEuclidist(touch, oldTouch) >= leniency) { - // return true; - // } - // } - // } - // } - // return false; - // } } }
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