Icard/angular-clarity-master(work.../node_modules/lit-html/node/development/directive.js

51 lines
1.3 KiB
JavaScript

/**
* @license
* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
const PartType = {
ATTRIBUTE: 1,
CHILD: 2,
PROPERTY: 3,
BOOLEAN_ATTRIBUTE: 4,
EVENT: 5,
ELEMENT: 6,
};
/**
* Creates a user-facing directive function from a Directive class. This
* function has the same parameters as the directive's render() method.
*/
const directive = (c) => (...values) => ({
// This property needs to remain unminified.
['_$litDirective$']: c,
values,
});
/**
* Base class for creating custom directives. Users should extend this class,
* implement `render` and/or `update`, and then pass their subclass to
* `directive`.
*/
class Directive {
constructor(_partInfo) { }
// See comment in Disconnectable interface for why this is a getter
get _$isConnected() {
return this._$parent._$isConnected;
}
/** @internal */
_$initialize(part, parent, attributeIndex) {
this.__part = part;
this._$parent = parent;
this.__attributeIndex = attributeIndex;
}
/** @internal */
_$resolve(part, props) {
return this.update(part, props);
}
update(_part, props) {
return this.render(...props);
}
}
export { Directive, PartType, directive };
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