| {"version":3,"file":"slider.js","sources":["../../../src/material/slider/slider-module.ts","../../../src/material/slider/slider.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {CommonModule} from '@angular/common';\nimport {NgModule} from '@angular/core';\nimport {GestureConfig, MatCommonModule} from '@angular/material/core';\nimport {HAMMER_GESTURE_CONFIG} from '@angular/platform-browser';\nimport {MatSlider} from './slider';\n\n\n@NgModule({\n imports: [CommonModule, MatCommonModule],\n exports: [MatSlider, MatCommonModule],\n declarations: [MatSlider],\n providers: [{provide: HAMMER_GESTURE_CONFIG, useClass: GestureConfig}]\n})\nexport class MatSliderModule {}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {FocusMonitor, FocusOrigin} from '@angular/cdk/a11y';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {coerceBooleanProperty, coerceNumberProperty} from '@angular/cdk/coercion';\nimport {\n DOWN_ARROW,\n END,\n HOME,\n LEFT_ARROW,\n PAGE_DOWN,\n PAGE_UP,\n RIGHT_ARROW,\n UP_ARROW,\n hasModifierKey,\n} from '@angular/cdk/keycodes';\nimport {\n Attribute,\n ChangeDetectionStrategy,\n ChangeDetectorRef,\n Component,\n ElementRef,\n EventEmitter,\n forwardRef,\n Inject,\n Input,\n OnDestroy,\n OnInit,\n Optional,\n Output,\n ViewChild,\n ViewEncapsulation,\n} from '@angular/core';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';\nimport {\n CanColor,\n CanColorCtor,\n CanDisable,\n CanDisableCtor,\n HammerInput,\n HasTabIndex,\n HasTabIndexCtor,\n mixinColor,\n mixinDisabled,\n mixinTabIndex,\n} from '@angular/material/core';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\nimport {Subscription} from 'rxjs';\n\n/**\n * Visually, a 30px separation between tick marks looks best. This is very subjective but it is\n * the default separation we chose.\n */\nconst MIN_AUTO_TICK_SEPARATION = 30;\n\n/** The thumb gap size for a disabled slider. */\nconst DISABLED_THUMB_GAP = 7;\n\n/** The thumb gap size for a non-active slider at its minimum value. */\nconst MIN_VALUE_NONACTIVE_THUMB_GAP = 7;\n\n/** The thumb gap size for an active slider at its minimum value. */\nconst MIN_VALUE_ACTIVE_THUMB_GAP = 10;\n\n/**\n * Provider Expression that allows mat-slider to register as a ControlValueAccessor.\n * This allows it to support [(ngModel)] and [formControl].\n * @docs-private\n */\nexport const MAT_SLIDER_VALUE_ACCESSOR: any = {\n provide: NG_VALUE_ACCESSOR,\n useExisting: forwardRef(() => MatSlider),\n multi: true\n};\n\n/** A simple change event emitted by the MatSlider component. */\nexport class MatSliderChange {\n /** The MatSlider that changed. */\n source: MatSlider;\n\n /** The new value of the source slider. */\n value: number | null;\n}\n\n\n// Boilerplate for applying mixins to MatSlider.\n/** @docs-private */\nclass MatSliderBase {\n constructor(public _elementRef: ElementRef) {}\n}\nconst _MatSliderMixinBase:\n HasTabIndexCtor &\n CanColorCtor &\n CanDisableCtor &\n typeof MatSliderBase =\n mixinTabIndex(mixinColor(mixinDisabled(MatSliderBase), 'accent'));\n\n/**\n * Allows users to select from a range of values by moving the slider thumb. It is similar in\n * behavior to the native `<input type=\"range\">` element.\n */\n@Component({\n moduleId: module.id,\n selector: 'mat-slider',\n exportAs: 'matSlider',\n providers: [MAT_SLIDER_VALUE_ACCESSOR],\n host: {\n '(focus)': '_onFocus()',\n '(blur)': '_onBlur()',\n '(mousedown)': '_onMousedown($event)',\n '(keydown)': '_onKeydown($event)',\n '(keyup)': '_onKeyup()',\n '(mouseenter)': '_onMouseenter()',\n '(slide)': '_onSlide($event)',\n '(slideend)': '_onSlideEnd()',\n '(slidestart)': '_onSlideStart($event)',\n 'class': 'mat-slider',\n 'role': 'slider',\n '[tabIndex]': 'tabIndex',\n '[attr.aria-disabled]': 'disabled',\n '[attr.aria-valuemax]': 'max',\n '[attr.aria-valuemin]': 'min',\n '[attr.aria-valuenow]': 'value',\n '[attr.aria-orientation]': 'vertical ? \"vertical\" : \"horizontal\"',\n '[class.mat-slider-disabled]': 'disabled',\n '[class.mat-slider-has-ticks]': 'tickInterval',\n '[class.mat-slider-horizontal]': '!vertical',\n '[class.mat-slider-axis-inverted]': '_invertAxis',\n '[class.mat-slider-sliding]': '_isSliding',\n '[class.mat-slider-thumb-label-showing]': 'thumbLabel',\n '[class.mat-slider-vertical]': 'vertical',\n '[class.mat-slider-min-value]': '_isMinValue',\n '[class.mat-slider-hide-last-tick]': 'disabled || _isMinValue && _thumbGap && _invertAxis',\n '[class._mat-animation-noopable]': '_animationMode === \"NoopAnimations\"',\n },\n templateUrl: 'slider.html',\n styleUrls: ['slider.css'],\n inputs: ['disabled', 'color', 'tabIndex'],\n encapsulation: ViewEncapsulation.None,\n changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class MatSlider extends _MatSliderMixinBase\n implements ControlValueAccessor, OnDestroy, CanDisable, CanColor, OnInit, HasTabIndex {\n /** Whether the slider is inverted. */\n @Input()\n get invert(): boolean { return this._invert; }\n set invert(value: boolean) {\n this._invert = coerceBooleanProperty(value);\n }\n private _invert = false;\n\n /** The maximum value that the slider can have. */\n @Input()\n get max(): number { return this._max; }\n set max(v: number) {\n this._max = coerceNumberProperty(v, this._max);\n this._percent = this._calculatePercentage(this._value);\n\n // Since this also modifies the percentage, we need to let the change detection know.\n this._changeDetectorRef.markForCheck();\n }\n private _max: number = 100;\n\n /** The minimum value that the slider can have. */\n @Input()\n get min(): number { return this._min; }\n set min(v: number) {\n this._min = coerceNumberProperty(v, this._min);\n\n // If the value wasn't explicitly set by the user, set it to the min.\n if (this._value === null) {\n this.value = this._min;\n }\n this._percent = this._calculatePercentage(this._value);\n\n // Since this also modifies the percentage, we need to let the change detection know.\n this._changeDetectorRef.markForCheck();\n }\n private _min: number = 0;\n\n /** The values at which the thumb will snap. */\n @Input()\n get step(): number { return this._step; }\n set step(v: number) {\n this._step = coerceNumberProperty(v, this._step);\n\n if (this._step % 1 !== 0) {\n this._roundToDecimal = this._step.toString().split('.').pop()!.length;\n }\n\n // Since this could modify the label, we need to notify the change detection.\n this._changeDetectorRef.markForCheck();\n }\n private _step: number = 1;\n\n /** Whether or not to show the thumb label. */\n @Input()\n get thumbLabel(): boolean { return this._thumbLabel; }\n set thumbLabel(value: boolean) { this._thumbLabel = coerceBooleanProperty(value); }\n private _thumbLabel: boolean = false;\n\n /**\n * How often to show ticks. Relative to the step so that a tick always appears on a step.\n * Ex: Tick interval of 4 with a step of 3 will draw a tick every 4 steps (every 12 values).\n */\n @Input()\n get tickInterval() { return this._tickInterval; }\n set tickInterval(value: 'auto' | number) {\n if (value === 'auto') {\n this._tickInterval = 'auto';\n } else if (typeof value === 'number' || typeof value === 'string') {\n this._tickInterval = coerceNumberProperty(value, this._tickInterval as number);\n } else {\n this._tickInterval = 0;\n }\n }\n private _tickInterval: 'auto' | number = 0;\n\n /** Value of the slider. */\n @Input()\n get value(): number | null {\n // If the value needs to be read and it is still uninitialized, initialize it to the min.\n if (this._value === null) {\n this.value = this._min;\n }\n return this._value;\n }\n set value(v: number | null) {\n if (v !== this._value) {\n let value = coerceNumberProperty(v);\n\n // While incrementing by a decimal we can end up with values like 33.300000000000004.\n // Truncate it to ensure that it matches the label and to make it easier to work with.\n if (this._roundToDecimal) {\n value = parseFloat(value.toFixed(this._roundToDecimal));\n }\n\n this._value = value;\n this._percent = this._calculatePercentage(this._value);\n\n // Since this also modifies the percentage, we need to let the change detection know.\n this._changeDetectorRef.markForCheck();\n }\n }\n private _value: number | null = null;\n\n /**\n * Function that will be used to format the value before it is displayed\n * in the thumb label. Can be used to format very large number in order\n * for them to fit into the slider thumb.\n */\n @Input() displayWith: (value: number | null) => string | number;\n\n /** Whether the slider is vertical. */\n @Input()\n get vertical(): boolean { return this._vertical; }\n set vertical(value: boolean) {\n this._vertical = coerceBooleanProperty(value);\n }\n private _vertical = false;\n\n /** Event emitted when the slider value has changed. */\n @Output() readonly change: EventEmitter<MatSliderChange> = new EventEmitter<MatSliderChange>();\n\n /** Event emitted when the slider thumb moves. */\n @Output() readonly input: EventEmitter<MatSliderChange> = new EventEmitter<MatSliderChange>();\n\n /**\n * Emits when the raw value of the slider changes. This is here primarily\n * to facilitate the two-way binding for the `value` input.\n * @docs-private\n */\n @Output() readonly valueChange: EventEmitter<number | null> = new EventEmitter<number | null>();\n\n /** The value to be used for display purposes. */\n get displayValue(): string | number {\n if (this.displayWith) {\n return this.displayWith(this.value);\n }\n\n // Note that this could be improved further by rounding something like 0.999 to 1 or\n // 0.899 to 0.9, however it is very performance sensitive, because it gets called on\n // every change detection cycle.\n if (this._roundToDecimal && this.value && this.value % 1 !== 0) {\n return this.value.toFixed(this._roundToDecimal);\n }\n\n return this.value || 0;\n }\n\n /** set focus to the host element */\n focus() {\n this._focusHostElement();\n }\n\n /** blur the host element */\n blur() {\n this._blurHostElement();\n }\n\n /** onTouch function registered via registerOnTouch (ControlValueAccessor). */\n onTouched: () => any = () => {};\n\n /** The percentage of the slider that coincides with the value. */\n get percent(): number { return this._clamp(this._percent); }\n private _percent: number = 0;\n\n /**\n * Whether or not the thumb is sliding.\n * Used to determine if there should be a transition for the thumb and fill track.\n */\n _isSliding: boolean = false;\n\n /**\n * Whether or not the slider is active (clicked or sliding).\n * Used to shrink and grow the thumb as according to the Material Design spec.\n */\n _isActive: boolean = false;\n\n /**\n * Whether the axis of the slider is inverted.\n * (i.e. whether moving the thumb in the positive x or y direction decreases the slider's value).\n */\n get _invertAxis() {\n // Standard non-inverted mode for a vertical slider should be dragging the thumb from bottom to\n // top. However from a y-axis standpoint this is inverted.\n return this.vertical ? !this.invert : this.invert;\n }\n\n\n /** Whether the slider is at its minimum value. */\n get _isMinValue() {\n return this.percent === 0;\n }\n\n /**\n * The amount of space to leave between the slider thumb and the track fill & track background\n * elements.\n */\n get _thumbGap() {\n if (this.disabled) {\n return DISABLED_THUMB_GAP;\n }\n if (this._isMinValue && !this.thumbLabel) {\n return this._isActive ? MIN_VALUE_ACTIVE_THUMB_GAP : MIN_VALUE_NONACTIVE_THUMB_GAP;\n }\n return 0;\n }\n\n /** CSS styles for the track background element. */\n get _trackBackgroundStyles(): { [key: string]: string } {\n const axis = this.vertical ? 'Y' : 'X';\n const scale = this.vertical ? `1, ${1 - this.percent}, 1` : `${1 - this.percent}, 1, 1`;\n const sign = this._shouldInvertMouseCoords() ? '-' : '';\n\n return {\n // scale3d avoids some rendering issues in Chrome. See #12071.\n transform: `translate${axis}(${sign}${this._thumbGap}px) scale3d(${scale})`\n };\n }\n\n /** CSS styles for the track fill element. */\n get _trackFillStyles(): { [key: string]: string } {\n const axis = this.vertical ? 'Y' : 'X';\n const scale = this.vertical ? `1, ${this.percent}, 1` : `${this.percent}, 1, 1`;\n const sign = this._shouldInvertMouseCoords() ? '' : '-';\n\n return {\n // scale3d avoids some rendering issues in Chrome. See #12071.\n transform: `translate${axis}(${sign}${this._thumbGap}px) scale3d(${scale})`\n };\n }\n\n /** CSS styles for the ticks container element. */\n get _ticksContainerStyles(): { [key: string]: string } {\n let axis = this.vertical ? 'Y' : 'X';\n // For a horizontal slider in RTL languages we push the ticks container off the left edge\n // instead of the right edge to avoid causing a horizontal scrollbar to appear.\n let sign = !this.vertical && this._getDirection() == 'rtl' ? '' : '-';\n let offset = this._tickIntervalPercent / 2 * 100;\n return {\n 'transform': `translate${axis}(${sign}${offset}%)`\n };\n }\n\n /** CSS styles for the ticks element. */\n get _ticksStyles(): { [key: string]: string } {\n let tickSize = this._tickIntervalPercent * 100;\n let backgroundSize = this.vertical ? `2px ${tickSize}%` : `${tickSize}% 2px`;\n let axis = this.vertical ? 'Y' : 'X';\n // Depending on the direction we pushed the ticks container, push the ticks the opposite\n // direction to re-center them but clip off the end edge. In RTL languages we need to flip the\n // ticks 180 degrees so we're really cutting off the end edge abd not the start.\n let sign = !this.vertical && this._getDirection() == 'rtl' ? '-' : '';\n let rotate = !this.vertical && this._getDirection() == 'rtl' ? ' rotate(180deg)' : '';\n let styles: { [key: string]: string } = {\n 'backgroundSize': backgroundSize,\n // Without translateZ ticks sometimes jitter as the slider moves on Chrome & Firefox.\n 'transform': `translateZ(0) translate${axis}(${sign}${tickSize / 2}%)${rotate}`\n };\n\n if (this._isMinValue && this._thumbGap) {\n let side = this.vertical ?\n (this._invertAxis ? 'Bottom' : 'Top') :\n (this._invertAxis ? 'Right' : 'Left');\n styles[`padding${side}`] = `${this._thumbGap}px`;\n }\n\n return styles;\n }\n\n get _thumbContainerStyles(): { [key: string]: string } {\n let axis = this.vertical ? 'Y' : 'X';\n // For a horizontal slider in RTL languages we push the thumb container off the left edge\n // instead of the right edge to avoid causing a horizontal scrollbar to appear.\n let invertOffset =\n (this._getDirection() == 'rtl' && !this.vertical) ? !this._invertAxis : this._invertAxis;\n let offset = (invertOffset ? this.percent : 1 - this.percent) * 100;\n return {\n 'transform': `translate${axis}(-${offset}%)`\n };\n }\n\n /** The size of a tick interval as a percentage of the size of the track. */\n private _tickIntervalPercent: number = 0;\n\n /** The dimensions of the slider. */\n private _sliderDimensions: ClientRect | null = null;\n\n private _controlValueAccessorChangeFn: (value: any) => void = () => {};\n\n /** Decimal places to round to, based on the step amount. */\n private _roundToDecimal: number;\n\n /** Subscription to the Directionality change EventEmitter. */\n private _dirChangeSubscription = Subscription.EMPTY;\n\n /** The value of the slider when the slide start event fires. */\n private _valueOnSlideStart: number | null;\n\n /** Reference to the inner slider wrapper element. */\n @ViewChild('sliderWrapper', {static: false}) private _sliderWrapper: ElementRef;\n\n /**\n * Whether mouse events should be converted to a slider position by calculating their distance\n * from the right or bottom edge of the slider as opposed to the top or left.\n */\n private _shouldInvertMouseCoords() {\n return (this._getDirection() == 'rtl' && !this.vertical) ? !this._invertAxis : this._invertAxis;\n }\n\n /** The language direction for this slider element. */\n private _getDirection() {\n return (this._dir && this._dir.value == 'rtl') ? 'rtl' : 'ltr';\n }\n\n constructor(elementRef: ElementRef,\n private _focusMonitor: FocusMonitor,\n private _changeDetectorRef: ChangeDetectorRef,\n @Optional() private _dir: Directionality,\n @Attribute('tabindex') tabIndex: string,\n // @breaking-change 8.0.0 `_animationMode` parameter to be made required.\n @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) {\n super(elementRef);\n\n this.tabIndex = parseInt(tabIndex) || 0;\n }\n\n ngOnInit() {\n this._focusMonitor\n .monitor(this._elementRef, true)\n .subscribe((origin: FocusOrigin) => {\n this._isActive = !!origin && origin !== 'keyboard';\n this._changeDetectorRef.detectChanges();\n });\n if (this._dir) {\n this._dirChangeSubscription = this._dir.change.subscribe(() => {\n this._changeDetectorRef.markForCheck();\n });\n }\n }\n\n ngOnDestroy() {\n this._focusMonitor.stopMonitoring(this._elementRef);\n this._dirChangeSubscription.unsubscribe();\n }\n\n _onMouseenter() {\n if (this.disabled) {\n return;\n }\n\n // We save the dimensions of the slider here so we can use them to update the spacing of the\n // ticks and determine where on the slider click and slide events happen.\n this._sliderDimensions = this._getSliderDimensions();\n this._updateTickIntervalPercent();\n }\n\n _onMousedown(event: MouseEvent) {\n // Don't do anything if the slider is disabled or the\n // user is using anything other than the main mouse button.\n if (this.disabled || event.button !== 0) {\n return;\n }\n\n const oldValue = this.value;\n this._isSliding = false;\n this._focusHostElement();\n this._updateValueFromPosition({x: event.clientX, y: event.clientY});\n\n // Emit a change and input event if the value changed.\n if (oldValue != this.value) {\n this._emitInputEvent();\n this._emitChangeEvent();\n }\n }\n\n _onSlide(event: HammerInput) {\n if (this.disabled) {\n return;\n }\n\n // The slide start event sometimes fails to fire on iOS, so if we're not already in the sliding\n // state, call the slide start handler manually.\n if (!this._isSliding) {\n this._onSlideStart(null);\n }\n\n // Prevent the slide from selecting anything else.\n event.preventDefault();\n\n let oldValue = this.value;\n this._updateValueFromPosition({x: event.center.x, y: event.center.y});\n\n // Native range elements always emit `input` events when the value changed while sliding.\n if (oldValue != this.value) {\n this._emitInputEvent();\n }\n }\n\n _onSlideStart(event: HammerInput | null) {\n if (this.disabled || this._isSliding) {\n return;\n }\n\n // Simulate mouseenter in case this is a mobile device.\n this._onMouseenter();\n\n this._isSliding = true;\n this._focusHostElement();\n this._valueOnSlideStart = this.value;\n\n if (event) {\n this._updateValueFromPosition({x: event.center.x, y: event.center.y});\n event.preventDefault();\n }\n }\n\n _onSlideEnd() {\n this._isSliding = false;\n\n if (this._valueOnSlideStart != this.value && !this.disabled) {\n this._emitChangeEvent();\n }\n this._valueOnSlideStart = null;\n }\n\n _onFocus() {\n // We save the dimensions of the slider here so we can use them to update the spacing of the\n // ticks and determine where on the slider click and slide events happen.\n this._sliderDimensions = this._getSliderDimensions();\n this._updateTickIntervalPercent();\n }\n\n _onBlur() {\n this.onTouched();\n }\n\n _onKeydown(event: KeyboardEvent) {\n if (this.disabled || hasModifierKey(event)) {\n return;\n }\n\n const oldValue = this.value;\n\n switch (event.keyCode) {\n case PAGE_UP:\n this._increment(10);\n break;\n case PAGE_DOWN:\n this._increment(-10);\n break;\n case END:\n this.value = this.max;\n break;\n case HOME:\n this.value = this.min;\n break;\n case LEFT_ARROW:\n // NOTE: For a sighted user it would make more sense that when they press an arrow key on an\n // inverted slider the thumb moves in that direction. However for a blind user, nothing\n // about the slider indicates that it is inverted. They will expect left to be decrement,\n // regardless of how it appears on the screen. For speakers ofRTL languages, they probably\n // expect left to mean increment. Therefore we flip the meaning of the side arrow keys for\n // RTL. For inverted sliders we prefer a good a11y experience to having it \"look right\" for\n // sighted users, therefore we do not swap the meaning.\n this._increment(this._getDirection() == 'rtl' ? 1 : -1);\n break;\n case UP_ARROW:\n this._increment(1);\n break;\n case RIGHT_ARROW:\n // See comment on LEFT_ARROW about the conditions under which we flip the meaning.\n this._increment(this._getDirection() == 'rtl' ? -1 : 1);\n break;\n case DOWN_ARROW:\n this._increment(-1);\n break;\n default:\n // Return if the key is not one that we explicitly handle to avoid calling preventDefault on\n // it.\n return;\n }\n\n if (oldValue != this.value) {\n this._emitInputEvent();\n this._emitChangeEvent();\n }\n\n this._isSliding = true;\n event.preventDefault();\n }\n\n _onKeyup() {\n this._isSliding = false;\n }\n\n /** Increments the slider by the given number of steps (negative number decrements). */\n private _increment(numSteps: number) {\n this.value = this._clamp((this.value || 0) + this.step * numSteps, this.min, this.max);\n }\n\n /** Calculate the new value from the new physical location. The value will always be snapped. */\n private _updateValueFromPosition(pos: {x: number, y: number}) {\n if (!this._sliderDimensions) {\n return;\n }\n\n let offset = this.vertical ? this._sliderDimensions.top : this._sliderDimensions.left;\n let size = this.vertical ? this._sliderDimensions.height : this._sliderDimensions.width;\n let posComponent = this.vertical ? pos.y : pos.x;\n\n // The exact value is calculated from the event and used to find the closest snap value.\n let percent = this._clamp((posComponent - offset) / size);\n\n if (this._shouldInvertMouseCoords()) {\n percent = 1 - percent;\n }\n\n // Since the steps may not divide cleanly into the max value, if the user\n // slid to 0 or 100 percent, we jump to the min/max value. This approach\n // is slightly more intuitive than using `Math.ceil` below, because it\n // follows the user's pointer closer.\n if (percent === 0) {\n this.value = this.min;\n } else if (percent === 1) {\n this.value = this.max;\n } else {\n const exactValue = this._calculateValue(percent);\n\n // This calculation finds the closest step by finding the closest\n // whole number divisible by the step relative to the min.\n const closestValue = Math.round((exactValue - this.min) / this.step) * this.step + this.min;\n\n // The value needs to snap to the min and max.\n this.value = this._clamp(closestValue, this.min, this.max);\n }\n }\n\n /** Emits a change event if the current value is different from the last emitted value. */\n private _emitChangeEvent() {\n this._controlValueAccessorChangeFn(this.value);\n this.valueChange.emit(this.value);\n this.change.emit(this._createChangeEvent());\n }\n\n /** Emits an input event when the current value is different from the last emitted value. */\n private _emitInputEvent() {\n this.input.emit(this._createChangeEvent());\n }\n\n /** Updates the amount of space between ticks as a percentage of the width of the slider. */\n private _updateTickIntervalPercent() {\n if (!this.tickInterval || !this._sliderDimensions) {\n return;\n }\n\n if (this.tickInterval == 'auto') {\n let trackSize = this.vertical ? this._sliderDimensions.height : this._sliderDimensions.width;\n let pixelsPerStep = trackSize * this.step / (this.max - this.min);\n let stepsPerTick = Math.ceil(MIN_AUTO_TICK_SEPARATION / pixelsPerStep);\n let pixelsPerTick = stepsPerTick * this.step;\n this._tickIntervalPercent = pixelsPerTick / trackSize;\n } else {\n this._tickIntervalPercent = this.tickInterval * this.step / (this.max - this.min);\n }\n }\n\n /** Creates a slider change object from the specified value. */\n private _createChangeEvent(value = this.value): MatSliderChange {\n let event = new MatSliderChange();\n\n event.source = this;\n event.value = value;\n\n return event;\n }\n\n /** Calculates the percentage of the slider that a value is. */\n private _calculatePercentage(value: number | null) {\n return ((value || 0) - this.min) / (this.max - this.min);\n }\n\n /** Calculates the value a percentage of the slider corresponds to. */\n private _calculateValue(percentage: number) {\n return this.min + percentage * (this.max - this.min);\n }\n\n /** Return a number between two numbers. */\n private _clamp(value: number, min = 0, max = 1) {\n return Math.max(min, Math.min(value, max));\n }\n\n /**\n * Get the bounding client rect of the slider track element.\n * The track is used rather than the native element to ignore the extra space that the thumb can\n * take up.\n */\n private _getSliderDimensions() {\n return this._sliderWrapper ? this._sliderWrapper.nativeElement.getBoundingClientRect() : null;\n }\n\n /**\n * Focuses the native element.\n * Currently only used to allow a blur event to fire but will be used with keyboard input later.\n */\n private _focusHostElement() {\n this._elementRef.nativeElement.focus();\n }\n\n /** Blurs the native element. */\n private _blurHostElement() {\n this._elementRef.nativeElement.blur();\n }\n\n /**\n * Sets the model value. Implemented as part of ControlValueAccessor.\n * @param value\n */\n writeValue(value: any) {\n this.value = value;\n }\n\n /**\n * Registers a callback to be triggered when the value has changed.\n * Implemented as part of ControlValueAccessor.\n * @param fn Callback to be registered.\n */\n registerOnChange(fn: (value: any) => void) {\n this._controlValueAccessorChangeFn = fn;\n }\n\n /**\n * Registers a callback to be triggered when the component is touched.\n * Implemented as part of ControlValueAccessor.\n * @param fn Callback to be registered.\n */\n registerOnTouched(fn: any) {\n this.onTouched = fn;\n }\n\n /**\n * Sets whether the component should be disabled.\n * Implemented as part of ControlValueAccessor.\n * @param isDisabled\n */\n setDisabledState(isDisabled: boolean) {\n this.disabled = isDisabled;\n 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