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AfterViewInit,
ChangeDetectorRef,
Component,
ContentChildren,
Directive,
ElementRef,
HostBinding,
Input,
NgZone,
OnChanges,
OnDestroy,
QueryList,
SimpleChanges,
TemplateRef,
ViewChild,
} from '@angular/core';
import { observeElementSize } from '../../utils/internal-utils';
import { Callback, RangeInputSlots } from '../../utils/util.types';
/**
* Used for marking elements that should be renderes as error messages.
*/
@Directive({
selector: 'ng-template[data-gc-error]',
})
export class LabelContainerErrorMessageDirective {
constructor(public template: TemplateRef<unknown>) {}
}
/**
* Component with two slots used for combining two input elements/components.
*/
@Component({
selector: 'gc-two-slot-label-container',
templateUrl: './two-slot-label-container.component.html',
styleUrls: [
'../../utils/styles/reset-form.css',
'./two-slot-label-container.component.css',
],
})
export class TwoSlotLabelContainerComponent
implements OnChanges, OnDestroy, AfterViewInit
{
/**
* Manual required state.
*/
@Input()
public required?: boolean;
/**
* Manual readonly state.
*/
@Input()
public readonly: boolean | Record<RangeInputSlots, boolean> = false;
/**
* Manual disabled state.
*/
@Input()
public disabled?: boolean;
/**
* Manual active state.
*/
@Input()
public active?: boolean;
/**
* Decides which slots contain errors. Undefined === none
*/
@Input()
public errorSlots?: 'start' | 'end' | 'both';
/** @ignore */
@ViewChild('startSlot')
public startSlotEl!: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('endSlot')
public endSlotEl!: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('infoContainer')
public infoContainerEl!: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('lastCharacterPositionEl')
public lastCharacterPositionEl!: ElementRef<HTMLSpanElement>;
/** @ignore */
@ContentChildren(LabelContainerErrorMessageDirective)
protected errorMessageElements?: QueryList<LabelContainerErrorMessageDirective>;
/** @ignore */
@HostBinding('style.padding-bottom.px')
protected paddingBottom = 0;
/** @ignore */
@HostBinding('style.--gc-label-position-offset.px')
private labelPositionOffset = 0;
/** @ignore */
@HostBinding('style.--gc-label-top-border-left-pos.px')
private labelTopBorderLeftPos = 0;
/** @ignore */
@HostBinding('style.--gc-label-max-width.px')
private labelMaxWidth = 0;
/** @ignore */
@ViewChild('labelEl')
private labelEl!: ElementRef<HTMLElement>;
/**
* Decides which slot has focus. Undefined === none
*/
@Input()
public get focusedSlot() {
return this._focusedSlot;
}
public set focusedSlot(value: 'start' | 'end' | undefined) {
if (value && this._focusedSlot === undefined) {
this.el.nativeElement.scrollIntoView({
block: 'nearest',
inline: 'nearest',
});
}
this._focusedSlot = value;
}
/** @ignore */
protected verticalMode = false;
private _focusedSlot?: 'start' | 'end';
/** @ignore */
private resizeObserver: Callback;
/** @ignore */
private infoContainerResizeObserver?: Callback;
/** @ignore */
private legendResizeObserver?: ResizeObserver;
constructor(
private el: ElementRef<HTMLElement>,
private zone: NgZone,
private cdr: ChangeDetectorRef,
) {
this.resizeObserver = observeElementSize(
el.nativeElement,
this.zone,
this.resizeObserverCallback.bind(this),
);
}
/** @ignore */
ngAfterViewInit(): void {
this.infoContainerResizeObserver = observeElementSize(
this.infoContainerEl.nativeElement,
this.zone,
() => {
this.paddingBottom = this.infoContainerEl.nativeElement.clientHeight;
},
);
this.zone.runOutsideAngular(() => {
this.legendResizeObserver = new ResizeObserver(() =>
this.computeLabelPositioning(),
);
this.legendResizeObserver.observe(this.startSlotEl.nativeElement);
this.legendResizeObserver.observe(this.labelEl.nativeElement);
});
}
/** @ignore */
ngOnChanges(changes: SimpleChanges): void {
if ('required' in changes && !changes.required.firstChange) {
this.computeLabelPositioning();
}
}
/** @ignore */
ngOnDestroy(): void {
this.resizeObserver();
if (this.infoContainerResizeObserver) {
this.infoContainerResizeObserver();
}
if (this.legendResizeObserver) {
this.legendResizeObserver.disconnect();
}
}
/** @ignore */
protected isActive(): boolean {
return !this.disabled && (this.active ?? false);
}
/** @ignore */
protected isReadonly(slot: RangeInputSlots): boolean {
if (typeof this.readonly === 'object') {
switch (slot) {
case 'start':
return this.readonly.start;
case 'end':
return this.readonly.end;
}
} else {
return this.readonly;
}
}
/** @ignore */
protected isDisabled(): boolean {
return this.disabled ?? false;
}
/** @ignore */
protected isRequired(): boolean {
return this.required ?? false;
}
/** @ignore */
private resizeObserverCallback(): void {
this.verticalMode = this.el.nativeElement.clientWidth < 380;
this.paddingBottom = this.infoContainerEl.nativeElement.clientHeight;
}
/** @ignore */
private computeLabelPositioning() {
const lineHeight = Number.parseFloat(
getComputedStyle(this.labelEl.nativeElement).lineHeight,
);
const labelVerticalOffset =
Math.ceil(
(this.labelEl.nativeElement.getBoundingClientRect().height -
lineHeight) /
10,
) * 10;
const lastCharacterOffsetLeft =
this.lastCharacterPositionEl.nativeElement.offsetLeft;
const maxLabelWidth = this.startSlotEl.nativeElement.clientWidth;
if (
this.labelPositionOffset !== labelVerticalOffset ||
this.labelTopBorderLeftPos !== lastCharacterOffsetLeft ||
this.labelMaxWidth !== maxLabelWidth
) {
this.zone.run(() => {
this.labelPositionOffset = labelVerticalOffset;
this.labelTopBorderLeftPos = lastCharacterOffsetLeft;
this.labelMaxWidth = maxLabelWidth;
});
}
}
}
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