84 lines
2.1 KiB
TypeScript
84 lines
2.1 KiB
TypeScript
/**
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* An overlay displayed in HTML.
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*/
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export class Overlay {
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private readonly overlay: HTMLDivElement;
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private readonly submitForm: HTMLFormElement | undefined;
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private readonly cancelForm: HTMLFormElement | undefined;
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/**
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* Constructs a new overlay.
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*
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* @param overlay the overlay element to show and hide
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* @param submitForm the form that invokes `onSubmit` and closes the overlay when submitted
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* @param cancelForm the form that closes the overlay when submitted
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* @param onSubmit the callback to invoke when the form is submit
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*/
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constructor(
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overlay: HTMLDivElement,
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submitForm: HTMLFormElement | undefined,
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cancelForm: HTMLFormElement | undefined,
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onSubmit: (() => void) | undefined = undefined
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) {
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this.overlay = overlay;
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overlay.addEventListener(
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"mousedown",
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event => {
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if (event.target === overlay)
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this.hide();
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}
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);
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document.addEventListener(
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"keydown",
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event => {
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if (event.key === "Escape" && this.isVisible())
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this.hide();
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}
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);
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this.submitForm = submitForm;
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submitForm?.addEventListener(
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"submit",
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event => {
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event.preventDefault();
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this.hide();
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onSubmit?.();
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}
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);
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this.cancelForm = cancelForm;
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cancelForm?.addEventListener(
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"submit",
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event => {
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event.preventDefault();
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this.hide();
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}
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);
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}
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/**
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* Shows the overlay.
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*/
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show(): void {
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this.overlay.style.visibility = "unset";
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}
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/**
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* Hides the overlay.
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*/
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hide(): void {
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this.overlay.style.visibility = "hidden";
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}
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/**
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* Returns `true` if and only if this overlay is currently visible.
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*/
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isVisible(): boolean {
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return this.overlay.style.visibility !== "hidden";
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}
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}
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