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* Copyright (c) Siemens 2016 - 2026
* SPDX-License-Identifier: MIT
*/
import { isPlatformBrowser } from '@angular/common';
import {
ChangeDetectionStrategy,
afterNextRender,
Component,
computed,
DestroyRef,
ElementRef,
inject,
Injector,
input,
NgZone,
OnChanges,
OnInit,
output,
PLATFORM_ID,
SimpleChanges,
viewChildren
} from '@angular/core';
import { GridItemHTMLElement, GridStack, GridStackNode, GridStackOptions } from 'gridstack';
import { DEFAULT_GRIDSTACK_OPTIONS, GridConfig } from '../../model/gridstack.model';
import {
WidgetComponentFactory,
WidgetConfig,
WidgetPositionConfig
} from '../../model/widgets.model';
import { SiWidgetHostComponent } from '../widget-host/si-widget-host.component';
export interface GridWrapperEvent {
event: Event;
items?: GridStackNode[];
grid: GridStack;
el?: GridItemHTMLElement;
}
@Component({
selector: 'si-gridstack-wrapper',
imports: [SiWidgetHostComponent],
templateUrl: './si-gridstack-wrapper.component.html',
styleUrl: './si-gridstack-wrapper.component.scss',
changeDetection: ChangeDetectionStrategy.Eager
})
export class SiGridstackWrapperComponent implements OnInit, OnChanges {
/**
* Grid items to render inside the gridstack
*
* @defaultValue []
*/
readonly widgetConfigs = input<WidgetConfig[]>([]);
/**
* Whenever gridstack allows to drag, resize or delete the grid item
*
* @defaultValue false
*/
readonly editable = input(false);
/**
* Module configuration
*/
readonly gridConfig = input<GridConfig>();
/**
* Map of widget id to widget definition, passed through to widget hosts.
*
* @defaultValue new Map()
*/
readonly widgetCatalogMap = input<Map<string, { componentFactory: WidgetComponentFactory }>>(
new Map()
);
/**
* Emits dashboard grid events.
*/
readonly gridEvent = output<GridWrapperEvent>();
/**
* Emits the id of a widget instance that shall be removed.
*/
readonly widgetInstanceRemove = output<string>();
/**
* Emits the id of a widget instance that shall be edited.
*/
readonly widgetInstanceEdit = output<WidgetConfig>();
private readonly widgetHosts = viewChildren(SiWidgetHostComponent);
private readonly widgetHostsMap = computed(
() => new Map(this.widgetHosts().map(host => [host.widgetConfig().id, host]))
);
protected grid?: GridStack;
private readonly ngZone = inject(NgZone);
private readonly elementRef = inject(ElementRef);
private readonly injector = inject(Injector);
private readonly platformId = inject(PLATFORM_ID);
private readonly isBrowser = isPlatformBrowser(this.platformId);
private readonly destroyRef = inject(DestroyRef);
ngOnChanges(changes: SimpleChanges<this>): void {
if (changes.widgetConfigs && !changes.widgetConfigs.firstChange) {
const configs = changes.widgetConfigs.currentValue;
const newIds = new Set(configs.map(w => w.id));
const hostMap = this.widgetHostsMap();
const hasAdds = configs.some(w => !hostMap.has(w.id));
if (hasAdds) {
this.startBatch();
}
Eif (this.isBrowser) {
for (const [id, host] of hostMap) {
if (!newIds.has(id)) {
this.grid?.removeWidget(host.elementRef);
}
}
}
}
if (changes.editable && !changes.editable.firstChange) {
this.grid?.enableMove(changes.editable.currentValue);
this.grid?.enableResize(changes.editable.currentValue);
}
}
ngOnInit(): void {
const initialViewMode: GridStackOptions = {
disableDrag: !this.editable(),
disableResize: !this.editable()
};
const options: GridStackOptions = {
...DEFAULT_GRIDSTACK_OPTIONS,
...this.gridConfig()?.gridStackOptions,
...initialViewMode
};
this.grid = GridStack.init(options, this.elementRef.nativeElement.firstChild as HTMLElement);
this.startBatch();
this.hookEvents(this.grid);
this.destroyRef.onDestroy(() => this.grid?.destroy());
}
private startBatch(): void {
this.grid?.batchUpdate(true);
// this ensures that si-widget-host components are rendered before turning off batch mode.
afterNextRender(() => this.grid?.batchUpdate(false), { injector: this.injector });
}
/**
*
* Returns the position of a specific widget in the grid.
*/
getWidgetLayout(widgetId: string): WidgetPositionConfig | undefined {
const gridItem = this.widgetHostsMap().get(widgetId);
if (!gridItem) {
return undefined;
}
const element = gridItem.elementRef;
return {
id: widgetId,
x: Number(element.getAttribute('gs-x')) || 0,
y: Number(element.getAttribute('gs-y')) || 0,
width: Number(element.getAttribute('gs-w')) || 0,
height: Number(element.getAttribute('gs-h')) || 0
};
}
private hookEvents(grid: GridStack): void {
grid.on(
'added removed dragstop resizestop disable enable dropped resize resizestart drag dragstart change',
(event: Event) => {
this.ngZone.run(() => {
this.gridEvent.emit({
event,
grid
});
});
}
);
}
}
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