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Merge pull request #117 from bigopon/templating-binding-let
feat(Let): support let element
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| import { | ||
| connectable, | ||
| enqueueBindingConnect, | ||
| sourceContext | ||
| } from 'aurelia-binding'; | ||
|
|
||
| export class LetExpression { | ||
| /** | ||
| * @param {ObserverLocator} observerLocator | ||
| * @param {string} targetProperty | ||
| * @param {Expression} sourceExpression | ||
| * @param {any} lookupFunctions | ||
| * @param {boolean} toBindingContext indicates let binding result should be assigned to binding context | ||
| */ | ||
| constructor(observerLocator, targetProperty, sourceExpression, lookupFunctions, toBindingContext) { | ||
| this.observerLocator = observerLocator; | ||
| this.sourceExpression = sourceExpression; | ||
| this.targetProperty = targetProperty; | ||
| this.lookupFunctions = lookupFunctions; | ||
| this.toBindingContext = toBindingContext; | ||
| } | ||
|
|
||
| createBinding() { | ||
| return new Let( | ||
| this.observerLocator, | ||
| this.sourceExpression, | ||
| this.targetProperty, | ||
| this.lookupFunctions, | ||
| this.toBindingContext | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| @connectable() | ||
| export class Let { | ||
| /** | ||
| * @param {ObserverLocator} observerLocator | ||
| * @param {Expression} sourceExpression | ||
| * @param {Function | Element} target | ||
| * @param {string} targetProperty | ||
| * @param {*} lookupFunctions | ||
| * @param {boolean} toBindingContext indicates let binding result should be assigned to binding context | ||
| */ | ||
| constructor(observerLocator, sourceExpression, targetProperty, lookupFunctions, toBindingContext) { | ||
| this.observerLocator = observerLocator; | ||
| this.sourceExpression = sourceExpression; | ||
| this.targetProperty = targetProperty; | ||
| this.lookupFunctions = lookupFunctions; | ||
| this.source = null; | ||
| this.target = null; | ||
| this.toBindingContext = toBindingContext; | ||
| } | ||
|
|
||
| updateTarget() { | ||
| const value = this.sourceExpression.evaluate(this.source, this.lookupFunctions); | ||
| this.target[this.targetProperty] = value; | ||
| } | ||
|
|
||
| call(context) { | ||
| if (!this.isBound) { | ||
| return; | ||
| } | ||
| if (context === sourceContext) { | ||
| this.updateTarget(); | ||
| return; | ||
| } | ||
| throw new Error(`Unexpected call context ${context}`); | ||
| } | ||
|
|
||
| /** | ||
| * @param {Scope} source Binding context | ||
| */ | ||
| bind(source) { | ||
| if (this.isBound) { | ||
| if (this.source === source) { | ||
| return; | ||
| } | ||
| this.unbind(); | ||
| } | ||
|
|
||
| this.isBound = true; | ||
| this.source = source; | ||
| this.target = this.toBindingContext ? source.bindingContext : source.overrideContext; | ||
|
|
||
| if (this.sourceExpression.bind) { | ||
| this.sourceExpression.bind(this, source, this.lookupFunctions); | ||
| } | ||
|
|
||
| enqueueBindingConnect(this); | ||
| } | ||
|
|
||
| unbind() { | ||
| if (!this.isBound) { | ||
| return; | ||
| } | ||
| this.isBound = false; | ||
| if (this.sourceExpression.unbind) { | ||
| this.sourceExpression.unbind(this, this.source); | ||
| } | ||
| this.source = null; | ||
| this.target = null; | ||
| this.unobserve(true); | ||
| } | ||
|
|
||
| connect() { | ||
| if (!this.isBound) { | ||
| return; | ||
| } | ||
| this.updateTarget(); | ||
| this.sourceExpression.connect(this, this.source); | ||
| } | ||
| } |
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