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bindable-property.js
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bindable-property.js
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import 'core-js';
import {_hyphenate} from './util';
import {BehaviorPropertyObserver} from './behavior-property-observer';
import {bindingMode} from 'aurelia-binding';
import {Container} from 'aurelia-dependency-injection';
function getObserver(behavior, instance, name) {
let lookup = instance.__observers__;
if (lookup === undefined) {
if(!behavior.isInitialized) {
behavior.initialize(Container.instance || new Container(), instance.constructor);
}
lookup = behavior.observerLocator.getOrCreateObserversLookup(instance);
behavior._ensurePropertiesDefined(instance, lookup);
}
return lookup[name];
}
/**
* Represents a bindable property on a behavior.
*/
export class BindableProperty {
/**
* Creates an instance of BindableProperty.
* @param nameOrConfig The name of the property or a cofiguration object.
*/
constructor(nameOrConfig: string | Object) {
if (typeof nameOrConfig === 'string') {
this.name = nameOrConfig;
} else {
Object.assign(this, nameOrConfig);
}
this.attribute = this.attribute || _hyphenate(this.name);
this.defaultBindingMode = this.defaultBindingMode || bindingMode.oneWay;
this.changeHandler = this.changeHandler || null;
this.owner = null;
this.descriptor = null;
}
/**
* Registers this bindable property with particular Class and Behavior instance.
* @param target The class to register this behavior with.
* @param behavior The behavior instance to register this property with.
* @param descriptor The property descriptor for this property.
*/
registerWith(target: Function, behavior: HtmlBehaviorResource, descriptor?: Object): void {
behavior.properties.push(this);
behavior.attributes[this.attribute] = this;
this.owner = behavior;
if (descriptor) {
this.descriptor = descriptor;
return this._configureDescriptor(behavior, descriptor);
}
}
_configureDescriptor(behavior: HtmlBehaviorResource, descriptor: Object): Object {
let name = this.name;
descriptor.configurable = true;
descriptor.enumerable = true;
if ('initializer' in descriptor) {
this.defaultValue = descriptor.initializer;
delete descriptor.initializer;
delete descriptor.writable;
}
if ('value' in descriptor) {
this.defaultValue = descriptor.value;
delete descriptor.value;
delete descriptor.writable;
}
descriptor.get = function() {
return getObserver(behavior, this, name).getValue();
};
descriptor.set = function(value) {
getObserver(behavior, this, name).setValue(value);
};
descriptor.get.getObserver = function(obj) {
return getObserver(behavior, obj, name);
};
return descriptor;
}
/**
* Defines this property on the specified class and behavior.
* @param target The class to define the property on.
* @param behavior The behavior to define the property on.
*/
defineOn(target: Function, behavior: HtmlBehaviorResource): void {
let name = this.name;
let handlerName;
if (this.changeHandler === null) {
handlerName = name + 'Changed';
if (handlerName in target.prototype) {
this.changeHandler = handlerName;
}
}
if (this.descriptor === null) {
Object.defineProperty(target.prototype, name, this._configureDescriptor(behavior, {}));
}
}
/**
* Creates an observer for this property.
* @param viewModel The view model instance on which to create the observer.
* @return The property observer.
*/
createObserver(viewModel: Object): BehaviorPropertyObserver {
let selfSubscriber = null;
let defaultValue = this.defaultValue;
let changeHandlerName = this.changeHandler;
let name = this.name;
let initialValue;
if (this.hasOptions) {
return undefined;
}
if (changeHandlerName in viewModel) {
if ('propertyChanged' in viewModel) {
selfSubscriber = (newValue, oldValue) => {
viewModel[changeHandlerName](newValue, oldValue);
viewModel.propertyChanged(name, newValue, oldValue);
};
} else {
selfSubscriber = (newValue, oldValue) => viewModel[changeHandlerName](newValue, oldValue);
}
} else if ('propertyChanged' in viewModel) {
selfSubscriber = (newValue, oldValue) => viewModel.propertyChanged(name, newValue, oldValue);
} else if (changeHandlerName !== null) {
throw new Error(`Change handler ${changeHandlerName} was specified but not delcared on the class.`);
}
if (defaultValue !== undefined) {
initialValue = typeof defaultValue === 'function' ? defaultValue.call(viewModel) : defaultValue;
}
return new BehaviorPropertyObserver(this.owner.taskQueue, viewModel, this.name, selfSubscriber, initialValue);
}
_initialize(viewModel, observerLookup, attributes, behaviorHandlesBind, boundProperties): void {
let selfSubscriber;
let observer;
let attribute;
let defaultValue = this.defaultValue;
if (this.isDynamic) {
for (let key in attributes) {
this._createDynamicProperty(viewModel, observerLookup, behaviorHandlesBind, key, attributes[key], boundProperties);
}
} else if (!this.hasOptions) {
observer = observerLookup[this.name];
if (attributes !== null) {
selfSubscriber = observer.selfSubscriber;
attribute = attributes[this.attribute];
if (behaviorHandlesBind) {
observer.selfSubscriber = null;
}
if (typeof attribute === 'string') {
viewModel[this.name] = attribute;
observer.call();
} else if (attribute) {
boundProperties.push({observer: observer, binding: attribute.createBinding(viewModel)});
} else if (defaultValue !== undefined) {
observer.call();
}
observer.selfSubscriber = selfSubscriber;
}
observer.publishing = true;
}
}
_createDynamicProperty(viewModel, observerLookup, behaviorHandlesBind, name, attribute, boundProperties) {
let changeHandlerName = name + 'Changed';
let selfSubscriber = null;
let observer;
let info;
if (changeHandlerName in viewModel) {
if ('propertyChanged' in viewModel) {
selfSubscriber = (newValue, oldValue) => {
viewModel[changeHandlerName](newValue, oldValue);
viewModel.propertyChanged(name, newValue, oldValue);
};
} else {
selfSubscriber = (newValue, oldValue) => viewModel[changeHandlerName](newValue, oldValue);
}
} else if ('propertyChanged' in viewModel) {
selfSubscriber = (newValue, oldValue) => viewModel.propertyChanged(name, newValue, oldValue);
}
observer = observerLookup[name] = new BehaviorPropertyObserver(
this.owner.taskQueue,
viewModel,
name,
selfSubscriber
);
Object.defineProperty(viewModel, name, {
configurable: true,
enumerable: true,
get: observer.getValue.bind(observer),
set: observer.setValue.bind(observer)
});
if (behaviorHandlesBind) {
observer.selfSubscriber = null;
}
if (typeof attribute === 'string') {
viewModel[name] = attribute;
observer.call();
} else if (attribute) {
info = {observer: observer, binding: attribute.createBinding(viewModel)};
boundProperties.push(info);
}
observer.publishing = true;
observer.selfSubscriber = selfSubscriber;
}
}