import * as i1 from '@angular/cdk/platform';
import { normalizePassiveListenerOptions, Platform, PlatformModule } from '@angular/cdk/platform';
import * as i0 from '@angular/core';
import { Injectable, NgZone, EventEmitter, Directive, ElementRef, Output, Optional, Inject, Input, HostListener, NgModule } from '@angular/core';
import { coerceElement, coerceNumberProperty, coerceBooleanProperty } from '@angular/cdk/coercion';
import { EMPTY, Subject, fromEvent } from 'rxjs';
import { auditTime, takeUntil } from 'rxjs/operators';
import { DOCUMENT } from '@angular/common';

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** Options to pass to the animationstart listener. */
const listenerOptions = normalizePassiveListenerOptions({ passive: true });
/**
 * An injectable service that can be used to monitor the autofill state of an input.
 * Based on the following blog post:
 * https://medium.com/@brunn/detecting-autofilled-fields-in-javascript-aed598d25da7
 */
class AutofillMonitor {
    constructor(_platform, _ngZone) {
        this._platform = _platform;
        this._ngZone = _ngZone;
        this._monitoredElements = new Map();
    }
    monitor(elementOrRef) {
        if (!this._platform.isBrowser) {
            return EMPTY;
        }
        const element = coerceElement(elementOrRef);
        const info = this._monitoredElements.get(element);
        if (info) {
            return info.subject;
        }
        const result = new Subject();
        const cssClass = 'cdk-text-field-autofilled';
        const listener = ((event) => {
            // Animation events fire on initial element render, we check for the presence of the autofill
            // CSS class to make sure this is a real change in state, not just the initial render before
            // we fire off events.
            if (event.animationName === 'cdk-text-field-autofill-start' &&
                !element.classList.contains(cssClass)) {
                element.classList.add(cssClass);
                this._ngZone.run(() => result.next({ target: event.target, isAutofilled: true }));
            }
            else if (event.animationName === 'cdk-text-field-autofill-end' &&
                element.classList.contains(cssClass)) {
                element.classList.remove(cssClass);
                this._ngZone.run(() => result.next({ target: event.target, isAutofilled: false }));
            }
        });
        this._ngZone.runOutsideAngular(() => {
            element.addEventListener('animationstart', listener, listenerOptions);
            element.classList.add('cdk-text-field-autofill-monitored');
        });
        this._monitoredElements.set(element, {
            subject: result,
            unlisten: () => {
                element.removeEventListener('animationstart', listener, listenerOptions);
            }
        });
        return result;
    }
    stopMonitoring(elementOrRef) {
        const element = coerceElement(elementOrRef);
        const info = this._monitoredElements.get(element);
        if (info) {
            info.unlisten();
            info.subject.complete();
            element.classList.remove('cdk-text-field-autofill-monitored');
            element.classList.remove('cdk-text-field-autofilled');
            this._monitoredElements.delete(element);
        }
    }
    ngOnDestroy() {
        this._monitoredElements.forEach((_info, element) => this.stopMonitoring(element));
    }
}
AutofillMonitor.ɵprov = i0.ɵɵdefineInjectable({ factory: function AutofillMonitor_Factory() { return new AutofillMonitor(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i0.NgZone)); }, token: AutofillMonitor, providedIn: "root" });
AutofillMonitor.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
AutofillMonitor.ctorParameters = () => [
    { type: Platform },
    { type: NgZone }
];
/** A directive that can be used to monitor the autofill state of an input. */
class CdkAutofill {
    constructor(_elementRef, _autofillMonitor) {
        this._elementRef = _elementRef;
        this._autofillMonitor = _autofillMonitor;
        /** Emits when the autofill state of the element changes. */
        this.cdkAutofill = new EventEmitter();
    }
    ngOnInit() {
        this._autofillMonitor
            .monitor(this._elementRef)
            .subscribe(event => this.cdkAutofill.emit(event));
    }
    ngOnDestroy() {
        this._autofillMonitor.stopMonitoring(this._elementRef);
    }
}
CdkAutofill.decorators = [
    { type: Directive, args: [{
                selector: '[cdkAutofill]',
            },] }
];
CdkAutofill.ctorParameters = () => [
    { type: ElementRef },
    { type: AutofillMonitor }
];
CdkAutofill.propDecorators = {
    cdkAutofill: [{ type: Output }]
};

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** Directive to automatically resize a textarea to fit its content. */
class CdkTextareaAutosize {
    constructor(_elementRef, _platform, _ngZone, 
    /** @breaking-change 11.0.0 make document required */
    document) {
        this._elementRef = _elementRef;
        this._platform = _platform;
        this._ngZone = _ngZone;
        this._destroyed = new Subject();
        this._enabled = true;
        /**
         * Value of minRows as of last resize. If the minRows has decreased, the
         * height of the textarea needs to be recomputed to reflect the new minimum. The maxHeight
         * does not have the same problem because it does not affect the textarea's scrollHeight.
         */
        this._previousMinRows = -1;
        this._isViewInited = false;
        /** Handles `focus` and `blur` events. */
        this._handleFocusEvent = (event) => {
            this._hasFocus = event.type === 'focus';
        };
        this._document = document;
        this._textareaElement = this._elementRef.nativeElement;
    }
    /** Minimum amount of rows in the textarea. */
    get minRows() { return this._minRows; }
    set minRows(value) {
        this._minRows = coerceNumberProperty(value);
        this._setMinHeight();
    }
    /** Maximum amount of rows in the textarea. */
    get maxRows() { return this._maxRows; }
    set maxRows(value) {
        this._maxRows = coerceNumberProperty(value);
        this._setMaxHeight();
    }
    /** Whether autosizing is enabled or not */
    get enabled() { return this._enabled; }
    set enabled(value) {
        value = coerceBooleanProperty(value);
        // Only act if the actual value changed. This specifically helps to not run
        // resizeToFitContent too early (i.e. before ngAfterViewInit)
        if (this._enabled !== value) {
            (this._enabled = value) ? this.resizeToFitContent(true) : this.reset();
        }
    }
    get placeholder() { return this._textareaElement.placeholder; }
    set placeholder(value) {
        this._cachedPlaceholderHeight = undefined;
        this._textareaElement.placeholder = value;
        this._cacheTextareaPlaceholderHeight();
    }
    /** Sets the minimum height of the textarea as determined by minRows. */
    _setMinHeight() {
        const minHeight = this.minRows && this._cachedLineHeight ?
            `${this.minRows * this._cachedLineHeight}px` : null;
        if (minHeight) {
            this._textareaElement.style.minHeight = minHeight;
        }
    }
    /** Sets the maximum height of the textarea as determined by maxRows. */
    _setMaxHeight() {
        const maxHeight = this.maxRows && this._cachedLineHeight ?
            `${this.maxRows * this._cachedLineHeight}px` : null;
        if (maxHeight) {
            this._textareaElement.style.maxHeight = maxHeight;
        }
    }
    ngAfterViewInit() {
        if (this._platform.isBrowser) {
            // Remember the height which we started with in case autosizing is disabled
            this._initialHeight = this._textareaElement.style.height;
            this.resizeToFitContent();
            this._ngZone.runOutsideAngular(() => {
                const window = this._getWindow();
                fromEvent(window, 'resize')
                    .pipe(auditTime(16), takeUntil(this._destroyed))
                    .subscribe(() => this.resizeToFitContent(true));
                this._textareaElement.addEventListener('focus', this._handleFocusEvent);
                this._textareaElement.addEventListener('blur', this._handleFocusEvent);
            });
            this._isViewInited = true;
            this.resizeToFitContent(true);
        }
    }
    ngOnDestroy() {
        this._textareaElement.removeEventListener('focus', this._handleFocusEvent);
        this._textareaElement.removeEventListener('blur', this._handleFocusEvent);
        this._destroyed.next();
        this._destroyed.complete();
    }
    /**
     * Cache the height of a single-row textarea if it has not already been cached.
     *
     * We need to know how large a single "row" of a textarea is in order to apply minRows and
     * maxRows. For the initial version, we will assume that the height of a single line in the
     * textarea does not ever change.
     */
    _cacheTextareaLineHeight() {
        if (this._cachedLineHeight) {
            return;
        }
        // Use a clone element because we have to override some styles.
        let textareaClone = this._textareaElement.cloneNode(false);
        textareaClone.rows = 1;
        // Use `position: absolute` so that this doesn't cause a browser layout and use
        // `visibility: hidden` so that nothing is rendered. Clear any other styles that
        // would affect the height.
        textareaClone.style.position = 'absolute';
        textareaClone.style.visibility = 'hidden';
        textareaClone.style.border = 'none';
        textareaClone.style.padding = '0';
        textareaClone.style.height = '';
        textareaClone.style.minHeight = '';
        textareaClone.style.maxHeight = '';
        // In Firefox it happens that textarea elements are always bigger than the specified amount
        // of rows. This is because Firefox tries to add extra space for the horizontal scrollbar.
        // As a workaround that removes the extra space for the scrollbar, we can just set overflow
        // to hidden. This ensures that there is no invalid calculation of the line height.
        // See Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=33654
        textareaClone.style.overflow = 'hidden';
        this._textareaElement.parentNode.appendChild(textareaClone);
        this._cachedLineHeight = textareaClone.clientHeight;
        this._textareaElement.parentNode.removeChild(textareaClone);
        // Min and max heights have to be re-calculated if the cached line height changes
        this._setMinHeight();
        this._setMaxHeight();
    }
    _measureScrollHeight() {
        const element = this._textareaElement;
        const previousMargin = element.style.marginBottom || '';
        const isFirefox = this._platform.FIREFOX;
        const needsMarginFiller = isFirefox && this._hasFocus;
        const measuringClass = isFirefox ?
            'cdk-textarea-autosize-measuring-firefox' :
            'cdk-textarea-autosize-measuring';
        // In some cases the page might move around while we're measuring the `textarea` on Firefox. We
        // work around it by assigning a temporary margin with the same height as the `textarea` so that
        // it occupies the same amount of space. See #23233.
        if (needsMarginFiller) {
            element.style.marginBottom = `${element.clientHeight}px`;
        }
        // Reset the textarea height to auto in order to shrink back to its default size.
        // Also temporarily force overflow:hidden, so scroll bars do not interfere with calculations.
        element.classList.add(measuringClass);
        // The measuring class includes a 2px padding to workaround an issue with Chrome,
        // so we account for that extra space here by subtracting 4 (2px top + 2px bottom).
        const scrollHeight = element.scrollHeight - 4;
        element.classList.remove(measuringClass);
        if (needsMarginFiller) {
            element.style.marginBottom = previousMargin;
        }
        return scrollHeight;
    }
    _cacheTextareaPlaceholderHeight() {
        if (!this._isViewInited || this._cachedPlaceholderHeight != undefined) {
            return;
        }
        if (!this.placeholder) {
            this._cachedPlaceholderHeight = 0;
            return;
        }
        const value = this._textareaElement.value;
        this._textareaElement.value = this._textareaElement.placeholder;
        this._cachedPlaceholderHeight = this._measureScrollHeight();
        this._textareaElement.value = value;
    }
    ngDoCheck() {
        if (this._platform.isBrowser) {
            this.resizeToFitContent();
        }
    }
    /**
     * Resize the textarea to fit its content.
     * @param force Whether to force a height recalculation. By default the height will be
     *    recalculated only if the value changed since the last call.
     */
    resizeToFitContent(force = false) {
        // If autosizing is disabled, just skip everything else
        if (!this._enabled) {
            return;
        }
        this._cacheTextareaLineHeight();
        this._cacheTextareaPlaceholderHeight();
        // If we haven't determined the line-height yet, we know we're still hidden and there's no point
        // in checking the height of the textarea.
        if (!this._cachedLineHeight) {
            return;
        }
        const textarea = this._elementRef.nativeElement;
        const value = textarea.value;
        // Only resize if the value or minRows have changed since these calculations can be expensive.
        if (!force && this._minRows === this._previousMinRows && value === this._previousValue) {
            return;
        }
        const scrollHeight = this._measureScrollHeight();
        const height = Math.max(scrollHeight, this._cachedPlaceholderHeight || 0);
        // Use the scrollHeight to know how large the textarea *would* be if fit its entire value.
        textarea.style.height = `${height}px`;
        this._ngZone.runOutsideAngular(() => {
            if (typeof requestAnimationFrame !== 'undefined') {
                requestAnimationFrame(() => this._scrollToCaretPosition(textarea));
            }
            else {
                setTimeout(() => this._scrollToCaretPosition(textarea));
            }
        });
        this._previousValue = value;
        this._previousMinRows = this._minRows;
    }
    /**
     * Resets the textarea to its original size
     */
    reset() {
        // Do not try to change the textarea, if the initialHeight has not been determined yet
        // This might potentially remove styles when reset() is called before ngAfterViewInit
        if (this._initialHeight !== undefined) {
            this._textareaElement.style.height = this._initialHeight;
        }
    }
    // In Ivy the `host` metadata will be merged, whereas in ViewEngine it is overridden. In order
    // to avoid double event listeners, we need to use `HostListener`. Once Ivy is the default, we
    // can move this back into `host`.
    // tslint:disable:no-host-decorator-in-concrete
    _noopInputHandler() {
        // no-op handler that ensures we're running change detection on input events.
    }
    /** Access injected document if available or fallback to global document reference */
    _getDocument() {
        return this._document || document;
    }
    /** Use defaultView of injected document if available or fallback to global window reference */
    _getWindow() {
        const doc = this._getDocument();
        return doc.defaultView || window;
    }
    /**
     * Scrolls a textarea to the caret position. On Firefox resizing the textarea will
     * prevent it from scrolling to the caret position. We need to re-set the selection
     * in order for it to scroll to the proper position.
     */
    _scrollToCaretPosition(textarea) {
        const { selectionStart, selectionEnd } = textarea;
        // IE will throw an "Unspecified error" if we try to set the selection range after the
        // element has been removed from the DOM. Assert that the directive hasn't been destroyed
        // between the time we requested the animation frame and when it was executed.
        // Also note that we have to assert that the textarea is focused before we set the
        // selection range. Setting the selection range on a non-focused textarea will cause
        // it to receive focus on IE and Edge.
        if (!this._destroyed.isStopped && this._hasFocus) {
            textarea.setSelectionRange(selectionStart, selectionEnd);
        }
    }
}
CdkTextareaAutosize.decorators = [
    { type: Directive, args: [{
                selector: 'textarea[cdkTextareaAutosize]',
                exportAs: 'cdkTextareaAutosize',
                host: {
                    'class': 'cdk-textarea-autosize',
                    // Textarea elements that have the directive applied should have a single row by default.
                    // Browsers normally show two rows by default and therefore this limits the minRows binding.
                    'rows': '1',
                },
            },] }
];
CdkTextareaAutosize.ctorParameters = () => [
    { type: ElementRef },
    { type: Platform },
    { type: NgZone },
    { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }
];
CdkTextareaAutosize.propDecorators = {
    minRows: [{ type: Input, args: ['cdkAutosizeMinRows',] }],
    maxRows: [{ type: Input, args: ['cdkAutosizeMaxRows',] }],
    enabled: [{ type: Input, args: ['cdkTextareaAutosize',] }],
    placeholder: [{ type: Input }],
    _noopInputHandler: [{ type: HostListener, args: ['input',] }]
};

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
class TextFieldModule {
}
TextFieldModule.decorators = [
    { type: NgModule, args: [{
                declarations: [CdkAutofill, CdkTextareaAutosize],
                imports: [PlatformModule],
                exports: [CdkAutofill, CdkTextareaAutosize],
            },] }
];

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

/**
 * Generated bundle index. Do not edit.
 */

export { AutofillMonitor, CdkAutofill, CdkTextareaAutosize, TextFieldModule };
//# sourceMappingURL=text-field.js.map