daniel-c-harvey
3835d9f9c4
Switch initiator to @onpointerdown; capture the pointer on the knob element through a new knob.ts helper so pointermove/up/cancel reach the knob even when the cursor leaves the window. Accurate comment; IAsyncDisposable cleanup.
21 lines
891 B
TypeScript
21 lines
891 B
TypeScript
/**
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* knob - pointer capture helpers for RadialKnob.
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*
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* setPointerCapture / releasePointerCapture are not exposed via Blazor's
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* ElementReference, so the component delegates here via JS interop.
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* Both functions are no-ops when the element reference is stale (e.g. the
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* component was disposed between the JS call and the microtask).
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*/
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/** Capture the pointer on the given element so pointermove/pointerup are
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* delivered even when the cursor leaves the browser window. */
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export function capturePointer(el: Element, pointerId: number): void {
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(el as HTMLElement).setPointerCapture(pointerId);
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}
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/** Release a previously captured pointer. Called on pointercancel.
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* pointerup releases capture implicitly, but we call this on cancel too. */
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export function releasePointer(el: Element, pointerId: number): void {
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(el as HTMLElement).releasePointerCapture(pointerId);
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}
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