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| /*
* @license
* Copyright Hôpitaux Universitaires de Genève. All Rights Reserved.
*
* Use of this source code is governed by an Apache-2.0 license that can be
* found in the LICENSE file at https://github.com/DSI-HUG/dejajs-components/blob/master/LICENSE
*/
import { FocusMonitor } from '@angular/cdk/a11y';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, DoCheck, ElementRef, EventEmitter, HostBinding, Input, OnChanges, OnDestroy, Optional, Output, Self, ViewChild } from '@angular/core';
import { ControlValueAccessor, FormControl, FormGroupDirective, NgControl, NgForm, ValidationErrors, Validator, ValidatorFn } from '@angular/forms';
import { _MatInputMixinBase, CanUpdateErrorState, ErrorStateMatcher, MatFormFieldControl } from '@angular/material';
import { Subject } from 'rxjs';
import { DejaTextMetricsService } from '../../common/core/text-metrics/text-metrics.service';
import { DejaChildValidatorDirective } from '../../common/core/validation/child-validator.directive';
export const createCounterRangeValidator = (maxValue: number, minValue: number) => {
return (c: FormControl) => {
const err = {
rangeError: {
given: c.value,
max: maxValue,
min: minValue
}
};
return ((maxValue && c.value > maxValue) || (minValue && c.value < minValue)) ? err : null;
};
};
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
providers: [{ provide: MatFormFieldControl, useExisting: DejaNumericStepperComponent }],
selector: 'deja-numeric-stepper',
styles: [require('./numeric-stepper.component.scss')],
template: require('./numeric-stepper.component.html')
})
export class DejaNumericStepperComponent extends _MatInputMixinBase implements CanUpdateErrorState, DoCheck, OnChanges, OnDestroy, ControlValueAccessor, MatFormFieldControl<number>, Validator {
public static nextId = 0;
@HostBinding() public id = `deja-numeric-stepper-${DejaNumericStepperComponent.nextId++}`;
@HostBinding('class.floating') public get shouldLabelFloat() {
return this.focused || !this.empty || this.alwaysDisplayUnit;
}
@HostBinding('attr.aria-describedby') public describedBy = '';
public controlType = 'deja-numeric-stepper';
public errorState = false;
public size = 0;
public stateChanges = new Subject<void>();
public focused = false;
/** Max value of stepper */
@Input() public max: number;
/** Min value of stepper */
@Input() public min: number;
/** Step for stepper : default 1 */
@Input() public step = 1;
/** Unit of stepper */
@Input() public unit: string;
@ViewChild(DejaChildValidatorDirective)
public set inputValidatorDirective(value: DejaChildValidatorDirective) {
Iif (value) {
value.parentControl = this.ngControl;
}
}
/**
* Placeholder of the input
*/
@Input() public get placeholder() {
return this._placeholder;
}
public set placeholder(plh) {
this._placeholder = plh;
this.stateChanges.next();
}
private _placeholder: string;
/** unit always visible */
@Input() public get alwaysDisplayUnit() {
return this._alwaysDisplayUnit;
}
public set alwaysDisplayUnit(value) {
this._alwaysDisplayUnit = coerceBooleanProperty(value);
}
private _alwaysDisplayUnit: boolean;
public get empty(): boolean {
return !this._value && this._value !== 0;
}
private _value: number;
/** Function for min / max validation */
public validateFn: ValidatorFn;
/** Output to get the event when the value is modified (no validation) */
@Output()
public textChange: EventEmitter<number> = new EventEmitter<number>();
/** Allow to disabled the component */
@Input()
public set disabled(value) {
const disabled = coerceBooleanProperty(value);
this._disabled = disabled || null;
this.changeDetectorRef.markForCheck();
}
@Input() public get required() {
return this._required;
}
public set required(req) {
this._required = coerceBooleanProperty(req);
this.stateChanges.next();
}
private _required = false;
/**
* Get disable value
*/
public get disabled() {
return this.ngControl ? this.ngControl.disabled : this._disabled;
}
@HostBinding('attr.disabled') private _disabled: boolean = null;
// NgModel implementation
protected onTouchedCallback: () => void = () => { };
protected onChangeCallback: (_: any) => void = () => { };
protected onValidatorChangeCallback: () => void = () => { };
constructor(
public dejaTextMetricsService: DejaTextMetricsService,
private elementRef: ElementRef,
private changeDetectorRef: ChangeDetectorRef,
@Self() @Optional() public ngControl: NgControl,
private fm: FocusMonitor,
@Optional() _parentForm: NgForm,
@Optional() _parentFormGroup: FormGroupDirective,
_defaultErrorStateMatcher: ErrorStateMatcher,
) {
super(_defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl);
Iif (this.ngControl) {
this.ngControl.valueAccessor = this;
}
this.fm.monitor(elementRef.nativeElement, true).subscribe((origin) => {
this.focused = !!origin;
if (!this.focused) {
this.onTouchedCallback();
}
this.stateChanges.next();
});
}
public ngOnChanges(changes: any) {
if (changes.min || changes.max) {
this.validateFn = createCounterRangeValidator(this.max, this.min);
if (this.ngControl && this.ngControl.control) {
this.ngControl.control.setValidators(this.validateFn);
}
}
}
public ngDoCheck() {
Iif (this.ngControl) {
// We need to re-evaluate this on every change detection cycle, because there are some
// error triggers that we can't subscribe to (e.g. parent form submissions). This means
// that whatever logic is in here has to be super lean or we risk destroying the performance.
this.updateErrorState();
}
}
public validate(c: FormControl): ValidationErrors {
return this.validateFn(c);
}
public ngOnDestroy() {
this.stateChanges.complete();
this.fm.stopMonitoring(this.elementRef.nativeElement);
}
public setDescribedByIds(ids: string[]) {
this.describedBy = ids.join(' ');
}
public onContainerClick(event: MouseEvent) {
if ((event.target as Element).tagName.toLowerCase() !== 'input') {
this.elementRef.nativeElement.querySelector('input').focus();
}
}
// ************* ControlValueAccessor Implementation **************
public get value() {
return this._value;
}
public set value(val: number) {
this.writeValue(val);
this.onChangeCallback(val);
this.onTouchedCallback();
this.stateChanges.next();
}
public writeValue(value: number) {
this._value = isNaN(value) ? null : +value;
this.checkSize(value);
this.changeDetectorRef.markForCheck();
this.textChange.emit(value);
}
public registerOnChange(fn: any) {
this.onChangeCallback = fn;
}
public registerOnTouched(fn: any) {
this.onTouchedCallback = fn;
}
public setDisabledState(isDisabled: boolean) {
this.disabled = isDisabled;
}
// ************* End of ControlValueAccessor Implementation **************
public checkSize(value?: number) {
this.size = this.dejaTextMetricsService.getTextWidth((value || this.value || 0).toString(), this.elementRef.nativeElement);
}
}
|