Serraniel / AniwatchPlus

export var isShiftPressed: boolean = false;

export var isCtrlPressed: boolean = false;

export function isHtmlElement(object: any) {

    return object instanceof HTMLElement;

}

export function initHelpers(): void {

    document.addEventListener('keydown', event => handleKeyDown(event));

    document.addEventListener('keyup', event => handleKeyUp(event));

}

export function onReady(fn: () => void) {

    if (document.readyState != 'loading') {

        fn();

    } else {

        document.addEventListener('DOMContentLoaded', fn);

    }

}

export function assigned(obj: any): boolean {

    return !(typeof obj === 'undefined' || obj === null);

}

function handleKeyDown(event: KeyboardEvent) {

    handleKeyToggle(event, true);

}

function handleKeyUp(event: KeyboardEvent) {

    handleKeyToggle(event, false);

}

function handleKeyToggle(event: KeyboardEvent, isPressed: boolean) {

    if (event.key === 'Shift') {

        isShiftPressed = isPressed;

    } else if (event.key === 'Control') {

        isCtrlPressed = isPressed;

    }

}

export function findTextNodes(baseNode: Node): Array<Node> {

    if (!assigned(baseNode)) {

        baseNode = document.documentElement;

    }

    let walker = document.createTreeWalker(baseNode, NodeFilter.SHOW_TEXT, null);

    let node;

    let results = [];

    while (node = walker.nextNode()) {

        results.push(node);

    }

    return results;

}