ngx-mat-lib
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A bunch of utilities and components to use in your Angular 7+ apps!
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JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
// tslint:disable:naming-convention member-ordering triple-equals
import { ChangeDetectorRef, ElementRef, NgZone, Optional, EventEmitter, Inject, Input, } from "@angular/core";
import { Directionality } from "@angular/cdk/bidi";
import { coerceNumberProperty } from "@angular/cdk/coercion";
import { ViewportRuler } from "@angular/cdk/scrolling";
import { FocusKeyManager } from "@angular/cdk/a11y";
import { END, ENTER, HOME, SPACE, hasModifierKey } from "@angular/cdk/keycodes";
import { Platform, normalizePassiveListenerOptions } from "@angular/cdk/platform";
import { ANIMATION_MODULE_TYPE } from "@angular/platform-browser/animations";
import { merge, of as observableOf, Subject, timer, fromEvent } from "rxjs";
import { takeUntil } from "rxjs/operators";
/** *
* Config used to bind passive event listeners
@type {?} */
var passiveEventListenerOptions = /** @type {?} */ (normalizePassiveListenerOptions({ passive: true }));
/** @typedef {?} */
var ScrollDirection;
export { ScrollDirection };
/** *
* The distance in pixels that will be overshot when scrolling a tab label into view. This helps
* provide a small affordance to the label next to it.
@type {?} */
var EXAGGERATED_OVERSCROLL = 60;
/** *
* Amount of milliseconds to wait before starting to scroll the header automatically.
* Set a little conservatively in order to handle fake events dispatched on touch devices.
@type {?} */
var HEADER_SCROLL_DELAY = 650;
/** *
* Interval in milliseconds at which to scroll the header
* while the user is holding their pointer.
@type {?} */
var HEADER_SCROLL_INTERVAL = 100;
/** @typedef {?} */
var XmatPaginatedTabHeaderItem;
export { XmatPaginatedTabHeaderItem };
/**
* Base class for a tab header that supported pagination.
* \@docs-private
* @abstract
*/
var XmatPaginatedTabHeaderDirective = /** @class */ (function () {
function XmatPaginatedTabHeaderDirective(_elementRef, _changeDetectorRef, _viewportRuler, _dir, _ngZone, _platform, _animationMode) {
var _this = this;
this._elementRef = _elementRef;
this._changeDetectorRef = _changeDetectorRef;
this._viewportRuler = _viewportRuler;
this._dir = _dir;
this._ngZone = _ngZone;
this._platform = _platform;
this._animationMode = _animationMode;
/**
* The distance in pixels that the tab labels should be translated to the left.
*/
this._scrollDistance = 0;
/**
* Whether the header should scroll to the selected index after the view has been checked.
*/
this._selectedIndexChanged = false;
/**
* Emits when the component is destroyed.
*/
this._destroyed = new Subject();
/**
* Whether the controls for pagination should be displayed
*/
this._showPaginationControls = false;
/**
* Whether the tab list can be scrolled more towards the end of the tab label list.
*/
this._disableScrollAfter = true;
/**
* Whether the tab list can be scrolled more towards the beginning of the tab label list.
*/
this._disableScrollBefore = true;
/**
* Stream that will stop the automated scrolling.
*/
this._stopScrolling = new Subject();
/**
* Whether pagination should be disabled. This can be used to avoid unnecessary
* layout recalculations if it"s known that pagination won"t be required.
*/
this.disablePagination = false;
this._selectedIndex = 0;
/**
* Event emitted when the option is selected.
*/
this.selectFocusedIndex = new EventEmitter();
/**
* Event emitted when a label is focused.
*/
this.indexFocused = new EventEmitter();
// Bind the `mouseleave` event on the outside since it doesn"t change anything in the view.
_ngZone.runOutsideAngular(function () {
fromEvent(_elementRef.nativeElement, "mouseleave")
.pipe(takeUntil(_this._destroyed))
.subscribe(function () {
_this._stopInterval();
});
});
}
Object.defineProperty(XmatPaginatedTabHeaderDirective.prototype, "selectedIndex", {
/** The index of the active tab. */
get: /**
* The index of the active tab.
* @return {?}
*/
function () {
return this._selectedIndex;
},
set: /**
* @param {?} value
* @return {?}
*/
function (value) {
value = coerceNumberProperty(value);
if (this._selectedIndex != value) {
this._selectedIndexChanged = true;
this._selectedIndex = value;
if (this._keyManager) {
this._keyManager.updateActiveItem(value);
}
}
},
enumerable: true,
configurable: true
});
/**
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype.ngAfterViewInit = /**
* @return {?}
*/
function () {
var _this = this;
// We need to handle these events manually, because we want to bind passive event listeners.
fromEvent(this._previousPaginator.nativeElement, "touchstart", passiveEventListenerOptions)
.pipe(takeUntil(this._destroyed))
.subscribe(function () {
_this._handlePaginatorPress("before");
});
fromEvent(this._nextPaginator.nativeElement, "touchstart", passiveEventListenerOptions)
.pipe(takeUntil(this._destroyed))
.subscribe(function () {
_this._handlePaginatorPress("after");
});
};
/**
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype.ngAfterContentInit = /**
* @return {?}
*/
function () {
var _this = this;
/** @type {?} */
var dirChange = this._dir ? this._dir.change : observableOf(null);
/** @type {?} */
var resize = this._viewportRuler.change(150);
/** @type {?} */
var realign = function () {
_this.updatePagination();
_this._alignInkBarToSelectedTab();
};
this._keyManager = new FocusKeyManager(this._items)
.withHorizontalOrientation(this._getLayoutDirection())
.withWrap();
this._keyManager.updateActiveItem(0);
// Defer the first call in order to allow for slower browsers to lay out the elements.
// This helps in cases where the user lands directly on a page with paginated tabs.
typeof requestAnimationFrame !== "undefined" ? requestAnimationFrame(realign) : realign();
// On dir change or window resize, realign the ink bar and update the orientation of
// the key manager if the direction has changed.
merge(dirChange, resize, this._items.changes).pipe(takeUntil(this._destroyed)).subscribe(function () {
realign();
_this._keyManager.withHorizontalOrientation(_this._getLayoutDirection());
});
// If there is a change in the focus key manager we need to emit the `indexFocused`
// event in order to provide a public event that notifies about focus changes. Also we realign
// the tabs container by scrolling the new focused tab into the visible section.
this._keyManager.change.pipe(takeUntil(this._destroyed)).subscribe(function (newFocusIndex) {
_this.indexFocused.emit(newFocusIndex);
_this._setTabFocus(newFocusIndex);
});
};
/**
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype.ngAfterContentChecked = /**
* @return {?}
*/
function () {
// If the number of tab labels have changed, check if scrolling should be enabled
if (this._tabLabelCount != this._items.length) {
this.updatePagination();
this._tabLabelCount = this._items.length;
this._changeDetectorRef.markForCheck();
}
// If the selected index has changed, scroll to the label and check if the scrolling controls
// should be disabled.
if (this._selectedIndexChanged) {
this._scrollToLabel(this._selectedIndex);
this._checkScrollingControls();
this._alignInkBarToSelectedTab();
this._selectedIndexChanged = false;
this._changeDetectorRef.markForCheck();
}
// If the scroll distance has been changed (tab selected, focused, scroll controls activated),
// then translate the header to reflect this.
if (this._scrollDistanceChanged) {
this._updateTabScrollPosition();
this._scrollDistanceChanged = false;
this._changeDetectorRef.markForCheck();
}
};
/**
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype.ngOnDestroy = /**
* @return {?}
*/
function () {
this._destroyed.next();
this._destroyed.complete();
this._stopScrolling.complete();
};
/** Handles keyboard events on the header. */
/**
* Handles keyboard events on the header.
* @param {?} event
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._handleKeydown = /**
* Handles keyboard events on the header.
* @param {?} event
* @return {?}
*/
function (event) {
// We don"t handle any key bindings with a modifier key.
if (hasModifierKey(event)) {
return;
}
switch (event.keyCode) {
case HOME:
this._keyManager.setFirstItemActive();
event.preventDefault();
break;
case END:
this._keyManager.setLastItemActive();
event.preventDefault();
break;
case ENTER:
case SPACE:
this.selectFocusedIndex.emit(this.focusIndex);
this._itemSelected(event);
break;
default:
this._keyManager.onKeydown(event);
}
};
/**
* Callback for when the MutationObserver detects that the content has changed.
*/
/**
* Callback for when the MutationObserver detects that the content has changed.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._onContentChanges = /**
* Callback for when the MutationObserver detects that the content has changed.
* @return {?}
*/
function () {
var _this = this;
/** @type {?} */
var textContent = this._elementRef.nativeElement.textContent;
// We need to diff the text content of the header, because the MutationObserver callback
// will fire even if the text content didn"t change which is inefficient and is prone
// to infinite loops if a poorly constructed expression is passed in (see #14249).
if (textContent !== this._currentTextContent) {
this._currentTextContent = textContent || "";
// The content observer runs outside the `NgZone` by default, which
// means that we need to bring the callback back in ourselves.
this._ngZone.run(function () {
_this.updatePagination();
_this._alignInkBarToSelectedTab();
_this._changeDetectorRef.markForCheck();
});
}
};
/**
* Updates the view whether pagination should be enabled or not.
*
* WARNING: Calling this method can be very costly in terms of performance. It should be called
* as infrequently as possible from outside of the Tabs component as it causes a reflow of the
* page.
*/
/**
* Updates the view whether pagination should be enabled or not.
*
* WARNING: Calling this method can be very costly in terms of performance. It should be called
* as infrequently as possible from outside of the Tabs component as it causes a reflow of the
* page.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype.updatePagination = /**
* Updates the view whether pagination should be enabled or not.
*
* WARNING: Calling this method can be very costly in terms of performance. It should be called
* as infrequently as possible from outside of the Tabs component as it causes a reflow of the
* page.
* @return {?}
*/
function () {
this._checkPaginationEnabled();
this._checkScrollingControls();
this._updateTabScrollPosition();
};
Object.defineProperty(XmatPaginatedTabHeaderDirective.prototype, "focusIndex", {
/** Tracks which element has focus; used for keyboard navigation */
get: /**
* Tracks which element has focus; used for keyboard navigation
* @return {?}
*/
function () {
// tslint:disable-next-line:no-non-null-assertion
return this._keyManager ? /** @type {?} */ ((this._keyManager.activeItemIndex)) : 0;
},
/** When the focus index is set, we must manually send focus to the correct label */
set: /**
* When the focus index is set, we must manually send focus to the correct label
* @param {?} value
* @return {?}
*/
function (value) {
if (!this._isValidIndex(value) || this.focusIndex === value || !this._keyManager) {
return;
}
this._keyManager.setActiveItem(value);
},
enumerable: true,
configurable: true
});
/**
* Determines if an index is valid. If the tabs are not ready yet, we assume that the user is
* providing a valid index and return true.
*/
/**
* Determines if an index is valid. If the tabs are not ready yet, we assume that the user is
* providing a valid index and return true.
* @param {?} index
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._isValidIndex = /**
* Determines if an index is valid. If the tabs are not ready yet, we assume that the user is
* providing a valid index and return true.
* @param {?} index
* @return {?}
*/
function (index) {
if (!this._items) {
return true;
}
/** @type {?} */
var tab = this._items ? this._items.toArray()[index] : null;
return !!tab && !tab.disabled;
};
/**
* Sets focus on the HTML element for the label wrapper and scrolls it into the view if
* scrolling is enabled.
*/
/**
* Sets focus on the HTML element for the label wrapper and scrolls it into the view if
* scrolling is enabled.
* @param {?} tabIndex
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._setTabFocus = /**
* Sets focus on the HTML element for the label wrapper and scrolls it into the view if
* scrolling is enabled.
* @param {?} tabIndex
* @return {?}
*/
function (tabIndex) {
if (this._showPaginationControls) {
this._scrollToLabel(tabIndex);
}
if (this._items && this._items.length) {
this._items.toArray()[tabIndex].focus();
/** @type {?} */
var containerEl = this._tabListContainer.nativeElement;
/** @type {?} */
var dir = this._getLayoutDirection();
if (dir == "ltr") {
containerEl.scrollLeft = 0;
}
else {
containerEl.scrollLeft = containerEl.scrollWidth - containerEl.offsetWidth;
}
}
};
/** The layout direction of the containing app. */
/**
* The layout direction of the containing app.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._getLayoutDirection = /**
* The layout direction of the containing app.
* @return {?}
*/
function () {
return this._dir && this._dir.value === "rtl" ? "rtl" : "ltr";
};
/** Performs the CSS transformation on the tab list that will cause the list to scroll. */
/**
* Performs the CSS transformation on the tab list that will cause the list to scroll.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._updateTabScrollPosition = /**
* Performs the CSS transformation on the tab list that will cause the list to scroll.
* @return {?}
*/
function () {
if (this.disablePagination) {
return;
}
/** @type {?} */
var scrollDistance = this.scrollDistance;
/** @type {?} */
var platform = this._platform;
/** @type {?} */
var translateX = this._getLayoutDirection() === "ltr" ? -scrollDistance : scrollDistance;
// Don"t use `translate3d` here because we don"t want to create a new layer. A new layer
// seems to cause flickering and overflow in Internet Explorer. For example, the ink bar
// and ripples will exceed the boundaries of the visible tab bar.
// See: https://github.com/angular/components/issues/10276
// We round the `transform` here, because transforms with sub-pixel precision cause some
// browsers to blur the content of the element.
this._tabList.nativeElement.style.transform = "translateX(" + Math.round(translateX) + "px)";
// Setting the `transform` on IE will change the scroll offset of the parent, causing the
// position to be thrown off in some cases. We have to reset it ourselves to ensure that
// it doesn"t get thrown off. Note that we scope it only to IE and Edge, because messing
// with the scroll position throws off Chrome 71+ in RTL mode (see #14689).
// @breaking-change 9.0.0 Remove null check for `platform` after it can no longer be undefined.
if (platform && (platform.TRIDENT || platform.EDGE)) {
this._tabListContainer.nativeElement.scrollLeft = 0;
}
};
Object.defineProperty(XmatPaginatedTabHeaderDirective.prototype, "scrollDistance", {
/** Sets the distance in pixels that the tab header should be transformed in the X-axis. */
get: /**
* Sets the distance in pixels that the tab header should be transformed in the X-axis.
* @return {?}
*/
function () {
return this._scrollDistance;
},
set: /**
* @param {?} value
* @return {?}
*/
function (value) {
this._scrollTo(value);
},
enumerable: true,
configurable: true
});
/**
* Moves the tab list in the "before" or "after" direction (towards the beginning of the list or
* the end of the list, respectively). The distance to scroll is computed to be a third of the
* length of the tab list view window.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
*/
/**
* Moves the tab list in the "before" or "after" direction (towards the beginning of the list or
* the end of the list, respectively). The distance to scroll is computed to be a third of the
* length of the tab list view window.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @param {?} direction
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._scrollHeader = /**
* Moves the tab list in the "before" or "after" direction (towards the beginning of the list or
* the end of the list, respectively). The distance to scroll is computed to be a third of the
* length of the tab list view window.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @param {?} direction
* @return {?}
*/
function (direction) {
/** @type {?} */
var viewLength = this._tabListContainer.nativeElement.offsetWidth;
/** @type {?} */
var scrollAmount = (direction == "before" ? -1 : 1) * viewLength / 3;
return this._scrollTo(this._scrollDistance + scrollAmount);
};
/** Handles click events on the pagination arrows. */
/**
* Handles click events on the pagination arrows.
* @param {?} direction
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._handlePaginatorClick = /**
* Handles click events on the pagination arrows.
* @param {?} direction
* @return {?}
*/
function (direction) {
this._stopInterval();
this._scrollHeader(direction);
};
/**
* Moves the tab list such that the desired tab label (marked by index) is moved into view.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
*/
/**
* Moves the tab list such that the desired tab label (marked by index) is moved into view.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @param {?} labelIndex
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._scrollToLabel = /**
* Moves the tab list such that the desired tab label (marked by index) is moved into view.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @param {?} labelIndex
* @return {?}
*/
function (labelIndex) {
if (this.disablePagination) {
return;
}
/** @type {?} */
var selectedLabel = this._items ? this._items.toArray()[labelIndex] : null;
if (!selectedLabel) {
return;
}
/** @type {?} */
var viewLength = this._tabListContainer.nativeElement.offsetWidth;
var _a = selectedLabel.elementRef.nativeElement, offsetLeft = _a.offsetLeft, offsetWidth = _a.offsetWidth;
/** @type {?} */
var labelBeforePos;
/** @type {?} */
var labelAfterPos;
if (this._getLayoutDirection() == "ltr") {
labelBeforePos = offsetLeft;
labelAfterPos = labelBeforePos + offsetWidth;
}
else {
labelAfterPos = this._tabList.nativeElement.offsetWidth - offsetLeft;
labelBeforePos = labelAfterPos - offsetWidth;
}
/** @type {?} */
var beforeVisiblePos = this.scrollDistance;
/** @type {?} */
var afterVisiblePos = this.scrollDistance + viewLength;
if (labelBeforePos < beforeVisiblePos) {
// Scroll header to move label to the before direction
this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL;
}
else if (labelAfterPos > afterVisiblePos) {
// Scroll header to move label to the after direction
this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL;
}
};
/**
* Evaluate whether the pagination controls should be displayed. If the scroll width of the
* tab list is wider than the size of the header container, then the pagination controls should
* be shown.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
*/
/**
* Evaluate whether the pagination controls should be displayed. If the scroll width of the
* tab list is wider than the size of the header container, then the pagination controls should
* be shown.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._checkPaginationEnabled = /**
* Evaluate whether the pagination controls should be displayed. If the scroll width of the
* tab list is wider than the size of the header container, then the pagination controls should
* be shown.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
function () {
if (this.disablePagination) {
this._showPaginationControls = false;
}
else {
/** @type {?} */
var isEnabled = this._tabList.nativeElement.scrollWidth > this._elementRef.nativeElement.offsetWidth;
if (!isEnabled) {
this.scrollDistance = 0;
}
if (isEnabled !== this._showPaginationControls) {
this._changeDetectorRef.markForCheck();
}
this._showPaginationControls = isEnabled;
}
};
/**
* Evaluate whether the before and after controls should be enabled or disabled.
* If the header is at the beginning of the list (scroll distance is equal to 0) then disable the
* before button. If the header is at the end of the list (scroll distance is equal to the
* maximum distance we can scroll), then disable the after button.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
*/
/**
* Evaluate whether the before and after controls should be enabled or disabled.
* If the header is at the beginning of the list (scroll distance is equal to 0) then disable the
* before button. If the header is at the end of the list (scroll distance is equal to the
* maximum distance we can scroll), then disable the after button.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._checkScrollingControls = /**
* Evaluate whether the before and after controls should be enabled or disabled.
* If the header is at the beginning of the list (scroll distance is equal to 0) then disable the
* before button. If the header is at the end of the list (scroll distance is equal to the
* maximum distance we can scroll), then disable the after button.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
function () {
if (this.disablePagination) {
this._disableScrollAfter = this._disableScrollBefore = true;
}
else {
// Check if the pagination arrows should be activated.
this._disableScrollBefore = this.scrollDistance == 0;
this._disableScrollAfter = this.scrollDistance == this._getMaxScrollDistance();
this._changeDetectorRef.markForCheck();
}
};
/**
* Determines what is the maximum length in pixels that can be set for the scroll distance. This
* is equal to the difference in width between the tab list container and tab header container.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
*/
/**
* Determines what is the maximum length in pixels that can be set for the scroll distance. This
* is equal to the difference in width between the tab list container and tab header container.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._getMaxScrollDistance = /**
* Determines what is the maximum length in pixels that can be set for the scroll distance. This
* is equal to the difference in width between the tab list container and tab header container.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
function () {
/** @type {?} */
var lengthOfTabList = this._tabList.nativeElement.scrollWidth;
/** @type {?} */
var viewLength = this._tabListContainer.nativeElement.offsetWidth;
return (lengthOfTabList - viewLength) || 0;
};
/** Tells the ink-bar to align itself to the current label wrapper */
/**
* Tells the ink-bar to align itself to the current label wrapper
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._alignInkBarToSelectedTab = /**
* Tells the ink-bar to align itself to the current label wrapper
* @return {?}
*/
function () {
/** @type {?} */
var selectedItem = this._items && this._items.length ?
this._items.toArray()[this.selectedIndex] : null;
/** @type {?} */
var selectedLabelWrapper = selectedItem ? selectedItem.elementRef.nativeElement : null;
if (selectedLabelWrapper) {
this._inkBar.alignToElement(selectedLabelWrapper);
}
else {
this._inkBar.hide();
}
};
/** Stops the currently-running paginator interval. */
/**
* Stops the currently-running paginator interval.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._stopInterval = /**
* Stops the currently-running paginator interval.
* @return {?}
*/
function () {
this._stopScrolling.next();
};
/**
* Handles the user pressing down on one of the paginators.
* Starts scrolling the header after a certain amount of time.
* @param direction In which direction the paginator should be scrolled.
*/
/**
* Handles the user pressing down on one of the paginators.
* Starts scrolling the header after a certain amount of time.
* @param {?} direction In which direction the paginator should be scrolled.
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._handlePaginatorPress = /**
* Handles the user pressing down on one of the paginators.
* Starts scrolling the header after a certain amount of time.
* @param {?} direction In which direction the paginator should be scrolled.
* @return {?}
*/
function (direction) {
var _this = this;
// Avoid overlapping timers.
this._stopInterval();
// Start a timer after the delay and keep firing based on the interval.
timer(HEADER_SCROLL_DELAY, HEADER_SCROLL_INTERVAL)
// Keep the timer going until something tells it to stop or the component is destroyed.
.pipe(takeUntil(merge(this._stopScrolling, this._destroyed)))
.subscribe(function () {
var _a = _this._scrollHeader(direction), maxScrollDistance = _a.maxScrollDistance, distance = _a.distance;
// Stop the timer if we"ve reached the start or the end.
if (distance === 0 || distance >= maxScrollDistance) {
_this._stopInterval();
}
});
};
/**
* Scrolls the header to a given position.
* @param {?} position Position to which to scroll.
* @return {?} Information on the current scroll distance and the maximum.
*/
XmatPaginatedTabHeaderDirective.prototype._scrollTo = /**
* Scrolls the header to a given position.
* @param {?} position Position to which to scroll.
* @return {?} Information on the current scroll distance and the maximum.
*/
function (position) {
if (this.disablePagination) {
return { maxScrollDistance: 0, distance: 0 };
}
/** @type {?} */
var maxScrollDistance = this._getMaxScrollDistance();
this._scrollDistance = Math.max(0, Math.min(maxScrollDistance, position));
// Mark that the scroll distance has changed so that after the view is checked, the CSS
// transformation can move the header.
this._scrollDistanceChanged = true;
this._checkScrollingControls();
return { maxScrollDistance: maxScrollDistance, distance: this._scrollDistance };
};
/** @nocollapse */
XmatPaginatedTabHeaderDirective.ctorParameters = function () { return [
{ type: ElementRef },
{ type: ChangeDetectorRef },
{ type: ViewportRuler },
{ type: Directionality, decorators: [{ type: Optional }] },
{ type: NgZone },
{ type: Platform },
{ type: String, decorators: [{ type: Optional }, { type: Inject, args: [ANIMATION_MODULE_TYPE,] }] }
]; };
XmatPaginatedTabHeaderDirective.propDecorators = {
disablePagination: [{ type: Input }]
};
return XmatPaginatedTabHeaderDirective;
}());
export { XmatPaginatedTabHeaderDirective };
if (false) {
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._items;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._inkBar;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._tabListContainer;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._tabList;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._nextPaginator;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._previousPaginator;
/**
* The distance in pixels that the tab labels should be translated to the left.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._scrollDistance;
/**
* Whether the header should scroll to the selected index after the view has been checked.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._selectedIndexChanged;
/**
* Emits when the component is destroyed.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._destroyed;
/**
* Whether the controls for pagination should be displayed
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._showPaginationControls;
/**
* Whether the tab list can be scrolled more towards the end of the tab label list.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._disableScrollAfter;
/**
* Whether the tab list can be scrolled more towards the beginning of the tab label list.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._disableScrollBefore;
/**
* The number of tab labels that are displayed on the header. When this changes, the header
* should re-evaluate the scroll position.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._tabLabelCount;
/**
* Whether the scroll distance has changed and should be applied after the view is checked.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._scrollDistanceChanged;
/**
* Used to manage focus between the tabs.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._keyManager;
/**
* Cached text content of the header.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._currentTextContent;
/**
* Stream that will stop the automated scrolling.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._stopScrolling;
/**
* Whether pagination should be disabled. This can be used to avoid unnecessary
* layout recalculations if it"s known that pagination won"t be required.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype.disablePagination;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._selectedIndex;
/**
* Event emitted when the option is selected.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype.selectFocusedIndex;
/**
* Event emitted when a label is focused.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype.indexFocused;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._elementRef;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._changeDetectorRef;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._viewportRuler;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._dir;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._ngZone;
/**
* @deprecated \@breaking-change 9.0.0 `_platform` and `_animationMode`
* parameters to become required.
* @type {?}
*/
XmatPaginatedTabHeaderDirective.prototype._platform;
/** @type {?} */
XmatPaginatedTabHeaderDirective.prototype._animationMode;
/**
* Called when the user has selected an item via the keyboard.
* @abstract
* @param {?} event
* @return {?}
*/
XmatPaginatedTabHeaderDirective.prototype._itemSelected = function (event) { };
}
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tslint:disable:naming-convention member-ordering triple-equals\n\nimport {\n    ChangeDetectorRef,\n    ElementRef,\n    NgZone,\n    Optional,\n    QueryList,\n    EventEmitter,\n    AfterContentChecked,\n    AfterContentInit,\n    AfterViewInit,\n    OnDestroy,\n    Directive,\n    Inject,\n    Input,\n} from \"@angular/core\";\nimport {Direction, Directionality} from \"@angular/cdk/bidi\";\nimport {coerceNumberProperty} from \"@angular/cdk/coercion\";\nimport {ViewportRuler} from \"@angular/cdk/scrolling\";\nimport {FocusKeyManager, FocusableOption} from \"@angular/cdk/a11y\";\nimport {END, ENTER, HOME, SPACE, hasModifierKey} from \"@angular/cdk/keycodes\";\nimport {Platform, normalizePassiveListenerOptions} from \"@angular/cdk/platform\";\nimport {ANIMATION_MODULE_TYPE} from \"@angular/platform-browser/animations\";\n//\nimport {merge, of as observableOf, Subject, timer, fromEvent} from \"rxjs\";\nimport {takeUntil} from \"rxjs/operators\";\n\n\n/** Config used to bind passive 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This helps\n * provide a small affordance to the label next to it.\n */\nconst EXAGGERATED_OVERSCROLL = 60;\n\n/**\n * Amount of milliseconds to wait before starting to scroll the header automatically.\n * Set a little conservatively in order to handle fake events dispatched on touch devices.\n */\nconst HEADER_SCROLL_DELAY = 650;\n\n/**\n * Interval in milliseconds at which to scroll the header\n * while the user is holding their pointer.\n */\nconst HEADER_SCROLL_INTERVAL = 100;\n\n/** Item inside a paginated tab header. */\nexport type XmatPaginatedTabHeaderItem = FocusableOption & { elementRef: ElementRef };\n\n/**\n * Base class for a tab header that supported pagination.\n * @docs-private\n */\nexport abstract class XmatPaginatedTabHeaderDirective implements AfterContentChecked, AfterContentInit,\n    AfterViewInit, OnDestroy {\n    abstract _items: QueryList<XmatPaginatedTabHeaderItem>;\n    abstract _inkBar: { hide: () => void, alignToElement: (element: HTMLElement) => void };\n    abstract _tabListContainer: ElementRef<HTMLElement>;\n    abstract _tabList: ElementRef<HTMLElement>;\n    abstract _nextPaginator: ElementRef<HTMLElement>;\n    abstract _previousPaginator: ElementRef<HTMLElement>;\n\n    /** The distance in pixels that the tab labels should be translated to the left. */\n    private _scrollDistance = 0;\n\n    /** Whether the header should scroll to the selected index after the view has been checked. */\n    private _selectedIndexChanged = false;\n\n    /** Emits when the component is destroyed. */\n    protected readonly _destroyed = new Subject<void>();\n\n    /** Whether the controls for pagination should be displayed */\n    _showPaginationControls = false;\n\n    /** Whether the tab list can be scrolled more towards the end of the tab label list. */\n    _disableScrollAfter = true;\n\n    /** Whether the tab list can be scrolled more towards the beginning of the tab label list. */\n    _disableScrollBefore = true;\n\n    /**\n     * The number of tab labels that are displayed on the header. When this changes, the header\n     * should re-evaluate the scroll position.\n     */\n    private _tabLabelCount: number;\n\n    /** Whether the scroll distance has changed and should be applied after the view is checked. */\n    private _scrollDistanceChanged: boolean;\n\n    /** Used to manage focus between the tabs. */\n    private _keyManager: FocusKeyManager<XmatPaginatedTabHeaderItem>;\n\n    /** Cached text content of the header. */\n    private _currentTextContent: string;\n\n    /** Stream that will stop the automated scrolling. */\n    private _stopScrolling = new Subject<void>();\n\n    /**\n     * Whether pagination should be disabled. This can be used to avoid unnecessary\n     * layout recalculations if it\"s known that pagination won\"t be required.\n     */\n    @Input()\n    disablePagination: boolean = false;\n\n    /** The index of the active tab. */\n    get selectedIndex(): number {\n        return this._selectedIndex;\n    }\n\n    set selectedIndex(value: number) {\n        value = coerceNumberProperty(value);\n\n        if (this._selectedIndex != value) {\n            this._selectedIndexChanged = true;\n            this._selectedIndex = value;\n\n            if (this._keyManager) {\n                this._keyManager.updateActiveItem(value);\n            }\n        }\n    }\n\n    private _selectedIndex: number = 0;\n\n    /** Event emitted when the option is selected. */\n    readonly selectFocusedIndex: EventEmitter<number> = new EventEmitter<number>();\n\n    /** Event emitted when a label is focused. */\n    readonly indexFocused: EventEmitter<number> = new EventEmitter<number>();\n\n    constructor(protected _elementRef: ElementRef<HTMLElement>,\n                protected _changeDetectorRef: ChangeDetectorRef,\n                private _viewportRuler: ViewportRuler,\n                @Optional() private _dir: Directionality,\n                private _ngZone: NgZone,\n                /**\n                 * @deprecated @breaking-change 9.0.0 `_platform` and `_animationMode`\n                 * parameters to become required.\n                 */\n                private _platform?: Platform,\n                @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) {\n\n        // Bind the `mouseleave` event on the outside since it doesn\"t change anything in the view.\n        _ngZone.runOutsideAngular(() => {\n            fromEvent(_elementRef.nativeElement, \"mouseleave\")\n            .pipe(takeUntil(this._destroyed))\n            .subscribe(() => {\n                this._stopInterval();\n            });\n        });\n    }\n\n    /** Called when the user has selected an item via the keyboard. */\n    protected abstract _itemSelected(event: KeyboardEvent): void;\n\n    ngAfterViewInit() {\n        // We need to handle these events manually, because we want to bind passive event listeners.\n        fromEvent(this._previousPaginator.nativeElement, \"touchstart\", passiveEventListenerOptions)\n        .pipe(takeUntil(this._destroyed))\n        .subscribe(() => {\n            this._handlePaginatorPress(\"before\");\n        });\n\n        fromEvent(this._nextPaginator.nativeElement, \"touchstart\", passiveEventListenerOptions)\n        .pipe(takeUntil(this._destroyed))\n        .subscribe(() => {\n            this._handlePaginatorPress(\"after\");\n        });\n    }\n\n    ngAfterContentInit() {\n        const dirChange = this._dir ? this._dir.change : observableOf(null);\n        const resize = this._viewportRuler.change(150);\n        const realign = () => {\n            this.updatePagination();\n            this._alignInkBarToSelectedTab();\n        };\n\n        this._keyManager = new FocusKeyManager<XmatPaginatedTabHeaderItem>(this._items)\n        .withHorizontalOrientation(this._getLayoutDirection())\n        .withWrap();\n\n        this._keyManager.updateActiveItem(0);\n\n        // Defer the first call in order to allow for slower browsers to lay out the elements.\n        // This helps in cases where the user lands directly on a page with paginated tabs.\n        typeof requestAnimationFrame !== \"undefined\" ? requestAnimationFrame(realign) : realign();\n\n        // On dir change or window resize, realign the ink bar and update the orientation of\n        // the key manager if the direction has changed.\n        merge(dirChange, resize, this._items.changes).pipe(takeUntil(this._destroyed)).subscribe(() => {\n            realign();\n            this._keyManager.withHorizontalOrientation(this._getLayoutDirection());\n        });\n\n        // If there is a change in the focus key manager we need to emit the `indexFocused`\n        // event in order to provide a public event that notifies about focus changes. Also we realign\n        // the tabs container by scrolling the new focused tab into the visible section.\n        this._keyManager.change.pipe(takeUntil(this._destroyed)).subscribe(newFocusIndex => {\n            this.indexFocused.emit(newFocusIndex);\n            this._setTabFocus(newFocusIndex);\n        });\n    }\n\n    ngAfterContentChecked(): void {\n        // If the number of tab labels have changed, check if scrolling should be enabled\n        if (this._tabLabelCount != this._items.length) {\n            this.updatePagination();\n            this._tabLabelCount = this._items.length;\n            this._changeDetectorRef.markForCheck();\n        }\n\n        // If the selected index has changed, scroll to the label and check if the scrolling controls\n        // should be disabled.\n        if (this._selectedIndexChanged) {\n            this._scrollToLabel(this._selectedIndex);\n            this._checkScrollingControls();\n            this._alignInkBarToSelectedTab();\n            this._selectedIndexChanged = false;\n            this._changeDetectorRef.markForCheck();\n        }\n\n        // If the scroll distance has been changed (tab selected, focused, scroll controls activated),\n        // then translate the header to reflect this.\n        if (this._scrollDistanceChanged) {\n            this._updateTabScrollPosition();\n            this._scrollDistanceChanged = false;\n            this._changeDetectorRef.markForCheck();\n        }\n    }\n\n    ngOnDestroy() {\n        this._destroyed.next();\n        this._destroyed.complete();\n        this._stopScrolling.complete();\n    }\n\n    /** Handles keyboard events on the header. */\n    _handleKeydown(event: KeyboardEvent) {\n        // We don\"t handle any key bindings with a modifier key.\n        if (hasModifierKey(event)) {\n            return;\n        }\n\n        switch (event.keyCode) {\n            case HOME:\n                this._keyManager.setFirstItemActive();\n                event.preventDefault();\n                break;\n            case END:\n                this._keyManager.setLastItemActive();\n                event.preventDefault();\n                break;\n            case ENTER:\n            case SPACE:\n                this.selectFocusedIndex.emit(this.focusIndex);\n                this._itemSelected(event);\n                break;\n            default:\n                this._keyManager.onKeydown(event);\n        }\n    }\n\n    /**\n     * Callback for when the MutationObserver detects that the content has changed.\n     */\n    _onContentChanges() {\n        const textContent = this._elementRef.nativeElement.textContent;\n\n        // We need to diff the text content of the header, because the MutationObserver callback\n        // will fire even if the text content didn\"t change which is inefficient and is prone\n        // to infinite loops if a poorly constructed expression is passed in (see #14249).\n        if (textContent !== this._currentTextContent) {\n            this._currentTextContent = textContent || \"\";\n\n            // The content observer runs outside the `NgZone` by default, which\n            // means that we need to bring the callback back in ourselves.\n            this._ngZone.run(() => {\n                this.updatePagination();\n                this._alignInkBarToSelectedTab();\n                this._changeDetectorRef.markForCheck();\n            });\n        }\n    }\n\n    /**\n     * Updates the view whether pagination should be enabled or not.\n     *\n     * WARNING: Calling this method can be very costly in terms of performance. It should be called\n     * as infrequently as possible from outside of the Tabs component as it causes a reflow of the\n     * page.\n     */\n    updatePagination() {\n        this._checkPaginationEnabled();\n        this._checkScrollingControls();\n        this._updateTabScrollPosition();\n    }\n\n    /** Tracks which element has focus; used for keyboard navigation */\n    get focusIndex(): number {\n        // tslint:disable-next-line:no-non-null-assertion\n        return this._keyManager ? this._keyManager.activeItemIndex! : 0;\n    }\n\n    /** When the focus index is set, we must manually send focus to the correct label */\n    set focusIndex(value: number) {\n        if (!this._isValidIndex(value) || this.focusIndex === value || !this._keyManager) {\n            return;\n        }\n\n        this._keyManager.setActiveItem(value);\n    }\n\n    /**\n     * Determines if an index is valid.  If the tabs are not ready yet, we assume that the user is\n     * providing a valid index and return true.\n     */\n    _isValidIndex(index: number): boolean {\n        if (!this._items) {\n            return true;\n        }\n\n        const tab = this._items ? this._items.toArray()[index] : null;\n        return !!tab && !tab.disabled;\n    }\n\n    /**\n     * Sets focus on the HTML element for the label wrapper and scrolls it into the view if\n     * scrolling is enabled.\n     */\n    _setTabFocus(tabIndex: number) {\n        if (this._showPaginationControls) {\n            this._scrollToLabel(tabIndex);\n        }\n\n        if (this._items && this._items.length) {\n            this._items.toArray()[tabIndex].focus();\n\n            // Do not let the browser manage scrolling to focus the element, this will be handled\n            // by using translation. In LTR, the scroll left should be 0. In RTL, the scroll width\n            // should be the full width minus the offset width.\n            const containerEl = this._tabListContainer.nativeElement;\n            const dir = this._getLayoutDirection();\n\n            if (dir == \"ltr\") {\n                containerEl.scrollLeft = 0;\n            }\n            else {\n                containerEl.scrollLeft = containerEl.scrollWidth - containerEl.offsetWidth;\n            }\n        }\n    }\n\n    /** The layout direction of the containing app. */\n    _getLayoutDirection(): Direction {\n        return this._dir && this._dir.value === \"rtl\" ? \"rtl\" : \"ltr\";\n    }\n\n    /** Performs the CSS transformation on the tab list that will cause the list to scroll. */\n    _updateTabScrollPosition() {\n        if (this.disablePagination) {\n            return;\n        }\n\n        const scrollDistance = this.scrollDistance;\n        const platform = this._platform;\n        const translateX = this._getLayoutDirection() === \"ltr\" ? -scrollDistance : scrollDistance;\n\n        // Don\"t use `translate3d` here because we don\"t want to create a new layer. A new layer\n        // seems to cause flickering and overflow in Internet Explorer. For example, the ink bar\n        // and ripples will exceed the boundaries of the visible tab bar.\n        // See: https://github.com/angular/components/issues/10276\n        // We round the `transform` here, because transforms with sub-pixel precision cause some\n        // browsers to blur the content of the element.\n        this._tabList.nativeElement.style.transform = `translateX(${Math.round(translateX)}px)`;\n\n        // Setting the `transform` on IE will change the scroll offset of the parent, causing the\n        // position to be thrown off in some cases. We have to reset it ourselves to ensure that\n        // it doesn\"t get thrown off. Note that we scope it only to IE and Edge, because messing\n        // with the scroll position throws off Chrome 71+ in RTL mode (see #14689).\n        // @breaking-change 9.0.0 Remove null check for `platform` after it can no longer be undefined.\n        if (platform && (platform.TRIDENT || platform.EDGE)) {\n            this._tabListContainer.nativeElement.scrollLeft = 0;\n        }\n    }\n\n    /** Sets the distance in pixels that the tab header should be transformed in the X-axis. */\n    get scrollDistance(): number {\n        return this._scrollDistance;\n    }\n\n    set scrollDistance(value: number) {\n        this._scrollTo(value);\n    }\n\n    /**\n     * Moves the tab list in the \"before\" or \"after\" direction (towards the beginning of the list or\n     * the end of the list, respectively). The distance to scroll is computed to be a third of the\n     * length of the tab list view window.\n     *\n     * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n     * should be called sparingly.\n     */\n    _scrollHeader(direction: ScrollDirection) {\n        const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n\n        // Move the scroll distance one-third the length of the tab list\"s viewport.\n        const scrollAmount = (direction == \"before\" ? -1 : 1) * viewLength / 3;\n\n        return this._scrollTo(this._scrollDistance + scrollAmount);\n    }\n\n    /** Handles click events on the pagination arrows. */\n    _handlePaginatorClick(direction: ScrollDirection) {\n        this._stopInterval();\n        this._scrollHeader(direction);\n    }\n\n    /**\n     * Moves the tab list such that the desired tab label (marked by index) is moved into view.\n     *\n     * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n     * should be called sparingly.\n     */\n    _scrollToLabel(labelIndex: number) {\n        if (this.disablePagination) {\n            return;\n        }\n\n        const selectedLabel = this._items ? this._items.toArray()[labelIndex] : null;\n\n        if (!selectedLabel) {\n            return;\n        }\n\n        // The view length is the visible width of the tab labels.\n        const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n        const {offsetLeft, offsetWidth} = selectedLabel.elementRef.nativeElement;\n\n        let labelBeforePos: number, labelAfterPos: number;\n        if (this._getLayoutDirection() == \"ltr\") {\n            labelBeforePos = offsetLeft;\n            labelAfterPos = labelBeforePos + offsetWidth;\n        }\n        else {\n            labelAfterPos = this._tabList.nativeElement.offsetWidth - offsetLeft;\n            labelBeforePos = labelAfterPos - offsetWidth;\n        }\n\n        const beforeVisiblePos = this.scrollDistance;\n        const afterVisiblePos = this.scrollDistance + viewLength;\n\n        if (labelBeforePos < beforeVisiblePos) {\n            // Scroll header to move label to the before direction\n            this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL;\n        }\n        else if (labelAfterPos > afterVisiblePos) {\n            // Scroll header to move label to the after direction\n            this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL;\n        }\n    }\n\n    /**\n     * Evaluate whether the pagination controls should be displayed. If the scroll width of the\n     * tab list is wider than the size of the header container, then the pagination controls should\n     * be shown.\n     *\n     * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n     * should be called sparingly.\n     */\n    _checkPaginationEnabled() {\n        if (this.disablePagination) {\n            this._showPaginationControls = false;\n        }\n        else {\n            const isEnabled =\n                this._tabList.nativeElement.scrollWidth > this._elementRef.nativeElement.offsetWidth;\n\n            if (!isEnabled) {\n                this.scrollDistance = 0;\n            }\n\n            if (isEnabled !== this._showPaginationControls) {\n                this._changeDetectorRef.markForCheck();\n            }\n\n            this._showPaginationControls = isEnabled;\n        }\n    }\n\n    /**\n     * Evaluate whether the before and after controls should be enabled or disabled.\n     * If the header is at the beginning of the list (scroll distance is equal to 0) then disable the\n     * before button. If the header is at the end of the list (scroll distance is equal to the\n     * maximum distance we can scroll), then disable the after button.\n     *\n     * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n     * should be called sparingly.\n     */\n    _checkScrollingControls() {\n        if (this.disablePagination) {\n            this._disableScrollAfter = this._disableScrollBefore = true;\n        }\n        else {\n            // Check if the pagination arrows should be activated.\n            this._disableScrollBefore = this.scrollDistance == 0;\n            this._disableScrollAfter = this.scrollDistance == this._getMaxScrollDistance();\n            this._changeDetectorRef.markForCheck();\n        }\n    }\n\n    /**\n     * Determines what is the maximum length in pixels that can be set for the scroll distance. This\n     * is equal to the difference in width between the tab list container and tab header container.\n     *\n     * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n     * should be called sparingly.\n     */\n    _getMaxScrollDistance(): number {\n        const lengthOfTabList = this._tabList.nativeElement.scrollWidth;\n        const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n        return (lengthOfTabList - viewLength) || 0;\n    }\n\n    /** Tells the ink-bar to align itself to the current label wrapper */\n    _alignInkBarToSelectedTab(): void {\n        const selectedItem = this._items && this._items.length ?\n            this._items.toArray()[this.selectedIndex] : null;\n        const selectedLabelWrapper = selectedItem ? selectedItem.elementRef.nativeElement : null;\n\n        if (selectedLabelWrapper) {\n            this._inkBar.alignToElement(selectedLabelWrapper);\n        }\n        else {\n            this._inkBar.hide();\n        }\n    }\n\n    /** Stops the currently-running paginator interval.  */\n    _stopInterval() {\n        this._stopScrolling.next();\n    }\n\n    /**\n     * Handles the user pressing down on one of the paginators.\n     * Starts scrolling the header after a certain amount of time.\n     * @param direction In which direction the paginator should be scrolled.\n     */\n    _handlePaginatorPress(direction: ScrollDirection) {\n        // Avoid overlapping timers.\n        this._stopInterval();\n\n        // Start a timer after the delay and keep firing based on the interval.\n        timer(HEADER_SCROLL_DELAY, HEADER_SCROLL_INTERVAL)\n        // Keep the timer going until something tells it to stop or the component is destroyed.\n        .pipe(takeUntil(merge(this._stopScrolling, this._destroyed)))\n        .subscribe(() => {\n            const {maxScrollDistance, distance} = this._scrollHeader(direction);\n\n            // Stop the timer if we\"ve reached the start or the end.\n            if (distance === 0 || distance >= maxScrollDistance) {\n                this._stopInterval();\n            }\n        });\n    }\n\n    /**\n     * Scrolls the header to a given position.\n     * @param position Position to which to scroll.\n     * @returns Information on the current scroll distance and the maximum.\n     */\n    private _scrollTo(position: number) {\n        if (this.disablePagination) {\n            return {maxScrollDistance: 0, distance: 0};\n        }\n\n        const maxScrollDistance = this._getMaxScrollDistance();\n        this._scrollDistance = Math.max(0, Math.min(maxScrollDistance, position));\n\n        // Mark that the scroll distance has changed so that after the view is checked, the CSS\n        // transformation can move the header.\n        this._scrollDistanceChanged = true;\n        this._checkScrollingControls();\n\n        return {maxScrollDistance, distance: this._scrollDistance};\n    }\n}\n"]}