@rxap/directives
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This package provides a set of Angular directives to simplify common tasks such as setting background images, confirming clicks, making elements contenteditable, and more. It includes directives for handling UI interactions, applying styles, and managing
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<div class="content interface">
<div class="content-data">
<ol class="breadcrumb">
<li class="breadcrumb-item">Interfaces</li>
<li class="breadcrumb-item"
>
IfTruthyDirectiveTemplateContext</li>
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<p class="comment">
<h3>File</h3>
</p>
<p class="comment">
<code>src/lib/if-truthy.directive.ts</code>
</p>
<section data-compodoc="block-index">
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
<tbody>
<tr>
<td class="col-md-4">
<h6><b>Properties</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<a href="#$implicit"
>
$implicit
</a>
</li>
</ul>
</td>
</tr>
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</table>
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<section data-compodoc="block-properties">
<h3 id="inputs">Properties</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="$implicit"></a>
<span class="name "><b>$implicit</b>
<a href="#$implicit">
<span class="icon ion-ios-link"></span>
</a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<code>$implicit: <code>Data</code>
</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Type : </i> <code>Data</code>
</td>
</tr>
</tbody>
</table>
</section>
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<div class="tab-pane fade tab-source-code" id="source">
<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import {
ChangeDetectorRef,
Directive,
Input,
OnChanges,
SimpleChanges,
TemplateRef,
ViewContainerRef,
} from '@angular/core';
import { Method } from '@rxap/pattern';
export interface IfTruthyDirectiveTemplateContext<Data> {
$implicit: Data;
}
// TODO : mv to rxap package
@Directive({
selector: '[rxapIfTruthy]',
standalone: true,
})
export class IfTruthyDirective<Data, Parameters = any> implements OnChanges {
@Input('rxapIfTruthy')
public method!: Method<Data, Parameters>;
@Input('rxapIfTruthyParameters')
public parameters!: Parameters;
@Input('rxapIfTruthyTrackBy')
public trackBy!: (data: Data) => any;
private _last?: Data;
constructor(
private readonly templateRef: TemplateRef<IfTruthyDirectiveTemplateContext<Data>>,
private readonly viewContainerRef: ViewContainerRef,
private readonly cdr: ChangeDetectorRef,
) {
}
/**
* Asserts the correct type of the context for the template that `NgForOf` will render.
*
* The presence of this method is a signal to the Ivy template type-check compiler that the
* `NgForOf` structural directive renders its template with a specific context type.
*/
static ngTemplateContextGuard<T>(
dir: IfTruthyDirective<T>,
ctx: any,
): ctx is IfTruthyDirectiveTemplateContext<T> {
return true;
}
public ngOnChanges(changes: SimpleChanges) {
if (this.method && this.parameters) {
this.execute();
}
}
protected async execute() {
const result = await this.method.call(this.parameters);
if (this.hasChanged(result)) {
this.viewContainerRef.clear();
if (result) {
this.viewContainerRef.createEmbeddedView(this.templateRef, { $implicit: result });
}
}
this.cdr.detectChanges();
}
protected hasChanged(current: Data) {
if (this._last !== undefined) {
const currentTrackBy = this.trackBy ? this.trackBy(current) : current;
const lastTrackBy = this.trackBy ? this.trackBy(this._last) : this._last;
return currentTrackBy !== lastTrackBy;
}
return true;
}
}
</code></pre>
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