/*!
 * (C) Ionic http://ionicframework.com - MIT License
 */
import { r as registerInstance, c as createEvent, w as writeTask, a as readTask, h, d as Host, g as getElement, e as config } from './index-C8IsBmNU.js';
import { f as findClosestIonContent, p as printIonContentErrorMsg, g as getScrollElement } from './index-BpFi2B8W.js';
import { c as getIonTheme } from './ionic-global-2lDD9k7y.js';
import { E as ENABLE_HTML_CONTENT_DEFAULT, a as sanitizeDOMString } from './config-mCdtaoPe.js';
import './helpers-Bsml3FcE.js';
import './focus-visible-vXpMhGrs.js';

const infiniteScrollCss = "ion-infinite-scroll{display:none;width:100%}.infinite-scroll-enabled{display:block}";

const InfiniteScroll = class {
    constructor(hostRef) {
        registerInstance(this, hostRef);
        this.ionInfinite = createEvent(this, "ionInfinite", 7);
        this.thrPx = 0;
        this.thrPc = 0;
        this.minHeightLocked = false;
        /**
         * didFire exists so that ionInfinite
         * does not fire multiple times if
         * users continue to scroll after
         * scrolling into the infinite
         * scroll threshold.
         */
        this.didFire = false;
        this.isBusy = false;
        this.isLoading = false;
        /**
         * The threshold distance from the bottom
         * of the content to call the `infinite` output event when scrolled.
         * The threshold value can be either a percent, or
         * in pixels. For example, use the value of `10%` for the `infinite`
         * output event to get called when the user has scrolled 10%
         * from the bottom of the page. Use the value `100px` when the
         * scroll is within 100 pixels from the bottom of the page.
         */
        this.threshold = '15%';
        /**
         * If `true`, the infinite scroll will be hidden and scroll event listeners
         * will be removed.
         *
         * Set this to true to disable the infinite scroll from actively
         * trying to receive new data while scrolling. This is useful
         * when it is known that there is no more data that can be added, and
         * the infinite scroll is no longer needed.
         */
        this.disabled = false;
        /**
         * The position of the infinite scroll element.
         * The value can be either `top` or `bottom`.
         */
        this.position = 'bottom';
        /**
         * If `true`, the infinite scroll will preserve the scroll position
         * when the content is re-rendered. This is useful when the content is
         * re-rendered with new keys, and the scroll position should be preserved.
         */
        this.preserveRerenderScrollPosition = false;
        this.onScroll = () => {
            const scrollEl = this.scrollEl;
            if (!scrollEl || !this.canStart()) {
                return 1;
            }
            const infiniteHeight = this.el.offsetHeight;
            if (infiniteHeight === 0) {
                // if there is no height of this element then do nothing
                return 2;
            }
            const scrollTop = scrollEl.scrollTop;
            const scrollHeight = scrollEl.scrollHeight;
            const height = scrollEl.offsetHeight;
            const threshold = this.thrPc !== 0 ? height * this.thrPc : this.thrPx;
            const distanceFromInfinite = this.position === 'bottom'
                ? scrollHeight - infiniteHeight - scrollTop - threshold - height
                : scrollTop - infiniteHeight - threshold;
            if (distanceFromInfinite < 0) {
                if (!this.didFire) {
                    this.isLoading = true;
                    this.didFire = true;
                    if (this.preserveRerenderScrollPosition) {
                        // Lock the min height of the siblings of the infinite scroll
                        // if we are preserving the rerender scroll position
                        this.lockSiblingMinHeight(true).then(() => {
                            this.ionInfinite.emit();
                        });
                    }
                    else {
                        this.ionInfinite.emit();
                    }
                    return 3;
                }
            }
            return 4;
        };
    }
    thresholdChanged() {
        const val = this.threshold;
        if (val.lastIndexOf('%') > -1) {
            this.thrPx = 0;
            this.thrPc = parseFloat(val) / 100;
        }
        else {
            this.thrPx = parseFloat(val);
            this.thrPc = 0;
        }
    }
    disabledChanged() {
        const disabled = this.disabled;
        if (disabled) {
            this.isLoading = false;
            this.isBusy = false;
        }
        this.enableScrollEvents(!disabled);
    }
    async connectedCallback() {
        const contentEl = findClosestIonContent(this.el);
        if (!contentEl) {
            printIonContentErrorMsg(this.el);
            return;
        }
        this.scrollEl = await getScrollElement(contentEl);
        this.thresholdChanged();
        this.disabledChanged();
        if (this.position === 'top') {
            writeTask(() => {
                if (this.scrollEl) {
                    this.scrollEl.scrollTop = this.scrollEl.scrollHeight - this.scrollEl.clientHeight;
                }
            });
        }
    }
    disconnectedCallback() {
        this.enableScrollEvents(false);
        this.scrollEl = undefined;
    }
    /**
     * Loop through our sibling elements and lock or unlock their min height.
     * This keeps our siblings, for example `ion-list`, the same height as their
     * content currently is, so when it loads new data and the DOM removes the old
     * data, the height of the container doesn't change and we don't lose our scroll position.
     *
     * We preserve existing min-height values, if they're set, so we don't erase what
     * has been previously set by the user when we restore after complete is called.
     */
    lockSiblingMinHeight(lock) {
        return new Promise((resolve) => {
            var _a;
            const siblings = ((_a = this.el.parentElement) === null || _a === void 0 ? void 0 : _a.children) || [];
            const writes = [];
            for (const sibling of siblings) {
                // Loop through all the siblings of the infinite scroll, but ignore ourself
                if (sibling !== this.el && sibling instanceof HTMLElement) {
                    if (lock) {
                        const elementHeight = sibling.getBoundingClientRect().height;
                        writes.push(() => {
                            if (this.minHeightLocked) {
                                // The previous min height is from us locking it before, so we can disregard it
                                // We still need to lock the min height if we're already locked, though, because
                                // the user could have triggered a new load before we've finished the previous one.
                                const previousMinHeight = sibling.style.minHeight;
                                if (previousMinHeight) {
                                    sibling.style.setProperty('--ion-previous-min-height', previousMinHeight);
                                }
                            }
                            sibling.style.minHeight = `${elementHeight}px`;
                        });
                    }
                    else {
                        writes.push(() => {
                            const previousMinHeight = sibling.style.getPropertyValue('--ion-previous-min-height');
                            sibling.style.minHeight = previousMinHeight || 'auto';
                            sibling.style.removeProperty('--ion-previous-min-height');
                        });
                    }
                }
            }
            writeTask(() => {
                writes.forEach((w) => w());
                this.minHeightLocked = lock;
                resolve();
            });
        });
    }
    /**
     * Call `complete()` within the `ionInfinite` output event handler when
     * your async operation has completed. For example, the `loading`
     * state is while the app is performing an asynchronous operation,
     * such as receiving more data from an AJAX request to add more items
     * to a data list. Once the data has been received and UI updated, you
     * then call this method to signify that the loading has completed.
     * This method will change the infinite scroll's state from `loading`
     * to `enabled`.
     */
    async complete() {
        const scrollEl = this.scrollEl;
        if (!this.isLoading || !scrollEl) {
            return;
        }
        this.isLoading = false;
        if (this.position === 'top') {
            /**
             * New content is being added at the top, but the scrollTop position stays the same,
             * which causes a scroll jump visually. This algorithm makes sure to prevent this.
             * (Frame 1)
             *    - complete() is called, but the UI hasn't had time to update yet.
             *    - Save the current content dimensions.
             *    - Wait for the next frame using _dom.read, so the UI will be updated.
             * (Frame 2)
             *    - Read the new content dimensions.
             *    - Calculate the height difference and the new scroll position.
             *    - Delay the scroll position change until other possible dom reads are done using _dom.write to be performant.
             * (Still frame 2, if I'm correct)
             *    - Change the scroll position (= visually maintain the scroll position).
             *    - Change the state to re-enable the InfiniteScroll.
             *    - This should be after changing the scroll position, or it could
             *    cause the InfiniteScroll to be triggered again immediately.
             * (Frame 3)
             *    Done.
             */
            this.isBusy = true;
            // ******** DOM READ ****************
            // Save the current content dimensions before the UI updates
            const prev = scrollEl.scrollHeight - scrollEl.scrollTop;
            // ******** DOM READ ****************
            requestAnimationFrame(() => {
                readTask(() => {
                    // UI has updated, save the new content dimensions
                    const scrollHeight = scrollEl.scrollHeight;
                    // New content was added on top, so the scroll position should be changed immediately to prevent it from jumping around
                    const newScrollTop = scrollHeight - prev;
                    // ******** DOM WRITE ****************
                    requestAnimationFrame(() => {
                        writeTask(() => {
                            scrollEl.scrollTop = newScrollTop;
                            this.isBusy = false;
                            this.didFire = false;
                        });
                    });
                });
            });
        }
        else {
            this.didFire = false;
        }
        // Unlock the min height of the siblings of the infinite scroll
        // if we are preserving the rerender scroll position
        if (this.preserveRerenderScrollPosition) {
            setTimeout(async () => {
                await this.lockSiblingMinHeight(false);
            }, 100);
        }
    }
    canStart() {
        return !this.disabled && !this.isBusy && !!this.scrollEl && !this.isLoading;
    }
    enableScrollEvents(shouldListen) {
        if (this.scrollEl) {
            if (shouldListen) {
                this.scrollEl.addEventListener('scroll', this.onScroll);
            }
            else {
                this.scrollEl.removeEventListener('scroll', this.onScroll);
            }
        }
    }
    render() {
        const theme = getIonTheme(this);
        const disabled = this.disabled;
        return (h(Host, { key: 'd2505798673c258aa017ecbe646b59105a62970d', class: {
                [theme]: true,
                'infinite-scroll-loading': this.isLoading,
                'infinite-scroll-enabled': !disabled,
            } }));
    }
    get el() { return getElement(this); }
    static get watchers() { return {
        "threshold": ["thresholdChanged"],
        "disabled": ["disabledChanged"]
    }; }
};
InfiniteScroll.style = infiniteScrollCss;

const ionicInfiniteScrollContentMdCss = "ion-infinite-scroll-content{display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;-ms-flex-pack:center;justify-content:center;min-height:84px;text-align:center;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.infinite-loading{margin-left:0;margin-right:0;margin-top:0;margin-bottom:32px;display:none;width:100%}.infinite-loading-text{-webkit-margin-start:32px;margin-inline-start:32px;-webkit-margin-end:32px;margin-inline-end:32px;margin-top:4px;margin-bottom:0}.infinite-scroll-loading ion-infinite-scroll-content>.infinite-loading{display:block}.infinite-scroll-content-md .infinite-loading-text{color:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-md .infinite-loading-spinner .spinner-lines-md line,.infinite-scroll-content-md .infinite-loading-spinner .spinner-lines-small-md line,.infinite-scroll-content-md .infinite-loading-spinner .spinner-crescent circle{stroke:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-md .infinite-loading-spinner .spinner-bubbles circle,.infinite-scroll-content-md .infinite-loading-spinner .spinner-circles circle,.infinite-scroll-content-md .infinite-loading-spinner .spinner-dots circle{fill:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}";

const infiniteScrollContentIosCss = "ion-infinite-scroll-content{display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;-ms-flex-pack:center;justify-content:center;min-height:84px;text-align:center;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.infinite-loading{margin-left:0;margin-right:0;margin-top:0;margin-bottom:32px;display:none;width:100%}.infinite-loading-text{-webkit-margin-start:32px;margin-inline-start:32px;-webkit-margin-end:32px;margin-inline-end:32px;margin-top:4px;margin-bottom:0}.infinite-scroll-loading ion-infinite-scroll-content>.infinite-loading{display:block}.infinite-scroll-content-ios .infinite-loading-text{color:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-ios .infinite-loading-spinner .spinner-lines-ios line,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-lines-small-ios line,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-crescent circle{stroke:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-ios .infinite-loading-spinner .spinner-bubbles circle,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-circles circle,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-dots circle{fill:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}";

const infiniteScrollContentMdCss = "ion-infinite-scroll-content{display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;-ms-flex-pack:center;justify-content:center;min-height:84px;text-align:center;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.infinite-loading{margin-left:0;margin-right:0;margin-top:0;margin-bottom:32px;display:none;width:100%}.infinite-loading-text{-webkit-margin-start:32px;margin-inline-start:32px;-webkit-margin-end:32px;margin-inline-end:32px;margin-top:4px;margin-bottom:0}.infinite-scroll-loading ion-infinite-scroll-content>.infinite-loading{display:block}.infinite-scroll-content-md .infinite-loading-text{color:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-md .infinite-loading-spinner .spinner-lines-md line,.infinite-scroll-content-md .infinite-loading-spinner .spinner-lines-small-md line,.infinite-scroll-content-md .infinite-loading-spinner .spinner-crescent circle{stroke:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}.infinite-scroll-content-md .infinite-loading-spinner .spinner-bubbles circle,.infinite-scroll-content-md .infinite-loading-spinner .spinner-circles circle,.infinite-scroll-content-md .infinite-loading-spinner .spinner-dots circle{fill:var(--ion-color-step-600, var(--ion-text-color-step-400, #666666))}";

const InfiniteScrollContent = class {
    constructor(hostRef) {
        registerInstance(this, hostRef);
        this.customHTMLEnabled = config.get('innerHTMLTemplatesEnabled', ENABLE_HTML_CONTENT_DEFAULT);
    }
    componentDidLoad() {
        if (this.loadingSpinner === undefined) {
            const theme = getIonTheme(this);
            this.loadingSpinner = config.get('infiniteLoadingSpinner', config.get('spinner', theme === 'ios' ? 'lines' : 'crescent'));
        }
    }
    renderLoadingText() {
        const { customHTMLEnabled, loadingText } = this;
        if (customHTMLEnabled) {
            return h("div", { class: "infinite-loading-text", innerHTML: sanitizeDOMString(loadingText) });
        }
        return h("div", { class: "infinite-loading-text" }, this.loadingText);
    }
    render() {
        const theme = getIonTheme(this);
        return (h(Host, { key: '51742937a374c43c290c20569857f617c99e1e7c', class: {
                [theme]: true,
                // Used internally for styling
                [`infinite-scroll-content-${theme}`]: true,
            } }, h("div", { key: '42c249b6df301004a834bb615766c38d5ab03d91', class: "infinite-loading" }, this.loadingSpinner && (h("div", { key: '7cc7aab81997ef58b914e084402f45dc3abf2ce4', class: "infinite-loading-spinner" }, h("ion-spinner", { key: '5c84df7096076580e0bb4926d377c2fac4f75c3d', name: this.loadingSpinner }))), this.loadingText !== undefined && this.renderLoadingText())));
    }
};
InfiniteScrollContent.style = {
    ionic: ionicInfiniteScrollContentMdCss,
    ios: infiniteScrollContentIosCss,
    md: infiniteScrollContentMdCss
};

export { InfiniteScroll as ion_infinite_scroll, InfiniteScrollContent as ion_infinite_scroll_content };
