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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
/* eslint-disable @angular-eslint/prefer-output-emitter-ref */
import { NgTemplateOutlet } from '@angular/common';
import {
booleanAttribute,
Component,
computed,
ElementRef,
EventEmitter,
inject,
Input,
numberAttribute,
OnChanges,
Output,
signal,
SimpleChanges,
TemplateRef
} from '@angular/core';
import { SiIconComponent } from '@siemens/element-ng/icon';
import { SiTranslatePipe, TranslatableString } from '@siemens/element-translate-ng/translate';
import { Action, CollapseTo, PartState, Scale, SplitOrientation } from './si-split.interfaces';
@Component({
selector: 'si-split-part',
imports: [NgTemplateOutlet, SiIconComponent, SiTranslatePipe],
templateUrl: './si-split-part.component.html',
styleUrl: './si-split-part.component.scss',
// Signals cannot be used directly with @HostBinding. See: https://github.com/angular/angular/issues/53888#issuecomment-1888935225
// Having every binding here for consistency.
host: {
'[class.is-collapsed]': 'collapsedState()',
'[class.collapse-start]': 'collapseDirection === "start"',
'[style.grid-area]': '"p-" + this.index'
}
})
export class SiSplitPartComponent implements OnChanges {
/** @defaultValue [] */
@Input() actions: Action[] = [];
/**
* @defaultValue 'start'
*/
@Input() collapseDirection: CollapseTo = 'start';
/**
* Sets the icon class that is used in the buttons of split parts to
* collapse and uncollapse the parts.
*
* @defaultValue 'element-double-right'
*/
@Input() collapseIconClass = 'element-double-right';
/**
* Collapse only to the given min size.
*
* @defaultValue false
*/
@Input({ transform: booleanAttribute }) collapseToMinSize = false;
@Input() headerTemplate?: TemplateRef<any>;
/**
* Sets the title of the split part header.
*/
@Input() heading!: TranslatableString;
/**
* Minimum size in px.
*
* @defaultValue 0
*/
@Input({ transform: numberAttribute }) minSize = 0;
/**
* When a split part is collapsed, the content gets hidden but it will
* still remain within the DOM. If you want to remove and destroy the component
* in collapsed mode and recreate it on un-collapse, set this property to
* true.
*
* @defaultValue false
*/
@Input({ transform: booleanAttribute }) removeContentOnCollapse = false;
/**
* Defines the behavior of the split part during scaling.
* E.g. when set to `none`, the spit part will keep its current size even when the parent container grows or shrinks.
*
* @defaultValue 'auto'
*/
@Input() scale: Scale = 'auto';
/**
* Defines if the collapse button of a split part is displayed. Default value is true.
*
* @defaultValue true
*/
@Input({ transform: booleanAttribute }) showCollapseButton = true;
/**
* Defines if the header of the split part is visible. Default is true.
*
* @defaultValue true
*/
@Input({ transform: booleanAttribute }) showHeader = true;
/**
* Aria label for collapse button. Needed for a11y
*
* @defaultValue 'collapse'
*/
@Input() collapseLabel: TranslatableString = 'collapse';
/**
* An optional stateId to uniquely identify a component instance.
* Required for persistence of ui state.
*/
@Input() stateId?: string;
/**
* Expanded size in px.
*/
@Input({ transform: numberAttribute }) size?: number;
/**
* This toggles the behavior when collapsing this split part.
* If enabled, all split parts between this one and the end of the split in the respective direction will be collapsed if this part is collapsed.
* If disabled, only this split part will be collapsed.
*
* The default value will change to false in v48.
*
* @defaultValue true
*/
@Input({ transform: booleanAttribute }) collapseOthers = true;
@Output() readonly collapseChanged = new EventEmitter<boolean>();
@Output() readonly stateChange = new EventEmitter<PartState>();
/** @internal */
index = 0;
/** @internal */
before?: SiSplitPartComponent;
/** @internal */
after?: SiSplitPartComponent;
/** @internal */
readonly fractionalSize = signal<number | undefined>(undefined);
/** @internal */
readonly collapsedSize = signal(0);
/** @internal */
readonly collapsedState = signal(false);
/**
* Get collapsed state.
* @returns True if the split part is collapsed, false is expanded.
*/
get collapsed(): boolean {
return this.collapsedState();
}
/** @internal */
readonly expandedSize = signal<number | undefined>(undefined);
/** @internal */
readonly actualSize = computed(() => {
if (this.collapsedState()) {
return this.collapsedSize();
}
return this.expandedSize() ?? 0;
});
/** @internal */
saveUIState!: () => void;
/** @internal */
readonly nextExpandedAfter = computed(() => {
if (!this.collapsedState()) {
return this as SiSplitPartComponent;
}
const nextExpanded: SiSplitPartComponent = this.after ? this.after.nextExpandedAfter() : this;
return nextExpanded;
});
private elementRef = inject<ElementRef<HTMLElement>>(ElementRef);
protected headerContext: { $implicit: SiSplitPartComponent } = {
$implicit: this
};
/** @defaultValue true */
@Input({ transform: booleanAttribute }) set expanded(value: boolean) {
this.collapsedState.set(!value);
Iif (this.collapseOthers) {
this.before?.refreshCollapseToStart();
this.after?.refreshCollapsedToEnd();
}
}
get expanded(): boolean {
return !this.collapsedState();
}
ngOnChanges(changes: SimpleChanges): void {
if (changes.collapseToMinSize && this.collapseToMinSize) {
this.collapsedSize.set(this.minSize ?? 40);
} else {
this.collapsedSize.set(40); // 40px is default size of the header
}
Iif (changes.size) {
this.expandedSize.set(this.size);
}
}
/** @internal */
refreshSizePx(orientation: SplitOrientation): void {
if (!this.collapsedState()) {
const rect = this.elementRef.nativeElement.getBoundingClientRect();
if (orientation === 'vertical') {
this.expandedSize.set(rect.height);
} else {
this.expandedSize.set(rect.width);
}
}
}
/**
* Toggles the collapsed or expanded state.
*/
toggleCollapse(): void {
this.collapsedState.update(v => !v);
if (this.collapseOthers) {
this.before?.refreshCollapseToStart();
this.after?.refreshCollapsedToEnd();
}
this.collapseChanged.emit(this.collapsedState());
this.stateChange.emit({ expanded: this.expanded, size: this.actualSize() });
this.saveUIState();
}
private refreshCollapsedToEnd(): void {
if (this.before?.collapsedState() && this.before.collapseDirection === 'end') {
this.collapsedState.set(true);
this.collapseDirection = 'end';
this.after?.refreshCollapsedToEnd();
}
}
private refreshCollapseToStart(): void {
if (this.after?.collapsedState() && this.after.collapseDirection === 'start') {
this.collapsedState.set(true);
this.collapseDirection = 'start';
this.before?.refreshCollapseToStart();
}
}
}
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