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126 lines
4.0 KiB
Plaintext
126 lines
4.0 KiB
Plaintext
/**
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* gridstack-item.component.ts 12.6.0
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* Copyright (c) 2022-2024 Alain Dumesny - see GridStack root license
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*/
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import { Component, ElementRef, Input, ViewChild, ViewContainerRef, OnDestroy, ComponentRef } from '@angular/core';
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import { GridItemHTMLElement, GridStackNode } from 'gridstack';
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import { BaseWidget } from './base-widget';
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/**
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* Extended HTMLElement interface for grid items.
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* Stores a back-reference to the Angular component for integration.
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*/
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export interface GridItemCompHTMLElement extends GridItemHTMLElement {
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/** Back-reference to the Angular GridStackItem component */
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_gridItemComp?: GridstackItemComponent;
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}
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/**
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* Angular component wrapper for individual GridStack items.
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*
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* This component represents a single grid item and handles:
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* - Dynamic content creation and management
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* - Integration with parent GridStack component
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* - Component lifecycle and cleanup
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* - Widget options and configuration
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*
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* Use in combination with GridstackComponent for the parent grid.
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*
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* @example
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* ```html
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* <gridstack>
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* <gridstack-item [options]="{x: 0, y: 0, w: 2, h: 1}">
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* <my-widget-component></my-widget-component>
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* </gridstack-item>
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* </gridstack>
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* ```
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*/
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@Component({
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selector: 'gridstack-item',
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template: `
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<div class="grid-stack-item-content">
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<!-- where dynamic items go based on component selector (recommended way), or sub-grids, etc...) -->
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<ng-template #container></ng-template>
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<!-- any static (defined in DOM - not recommended) content goes here -->
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<ng-content></ng-content>
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<!-- fallback HTML content from GridStackWidget.content if used instead (not recommended) -->
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{{options.content}}
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</div>`,
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styles: [`
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:host { display: block; }
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`],
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standalone: true,
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// changeDetection: ChangeDetectionStrategy.OnPush, // IFF you want to optimize and control when ChangeDetection needs to happen...
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})
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export class GridstackItemComponent implements OnDestroy {
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/**
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* Container for dynamic component creation within this grid item.
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* Used to append child components programmatically.
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*/
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@ViewChild('container', { read: ViewContainerRef, static: true}) public container?: ViewContainerRef;
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/**
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* Component reference for dynamic component removal.
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* Used internally when this component is created dynamically.
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*/
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public ref: ComponentRef<GridstackItemComponent> | undefined;
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/**
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* Reference to child widget component for serialization.
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* Used to save/restore additional data along with grid position.
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*/
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public childWidget: BaseWidget | undefined;
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/**
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* Grid item configuration options.
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* Defines position, size, and behavior of this grid item.
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*
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* @example
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* ```typescript
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* itemOptions: GridStackNode = {
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* x: 0, y: 0, w: 2, h: 1,
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* noResize: true,
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* content: 'Item content'
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* };
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* ```
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*/
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@Input() public set options(val: GridStackNode) {
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const grid = this.el.gridstackNode?.grid;
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if (grid) {
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// already built, do an update...
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grid.update(this.el, val);
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} else {
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// store our custom element in options so we can update it and not re-create a generic div!
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this._options = {...val, el: this.el};
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}
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}
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/** return the latest grid options (from GS once built, otherwise initial values) */
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public get options(): GridStackNode {
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return this.el.gridstackNode || this._options || {el: this.el};
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}
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protected _options?: GridStackNode;
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/** return the native element that contains grid specific fields as well */
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public get el(): GridItemCompHTMLElement { return this.elementRef.nativeElement; }
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/** clears the initial options now that we've built */
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public clearOptions() {
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delete this._options;
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}
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constructor(protected readonly elementRef: ElementRef<GridItemCompHTMLElement>) {
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this.el._gridItemComp = this;
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}
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public ngOnDestroy(): void {
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this.clearOptions();
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delete this.childWidget
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delete this.el._gridItemComp;
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delete this.container;
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delete this.ref;
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}
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}
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