mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-08-15 19:26:42 +08:00
635 lines
24 KiB
TypeScript
635 lines
24 KiB
TypeScript
import observable = require("data/observable");
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import definition = require("ui/core/bindable");
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import dependencyObservable = require("ui/core/dependency-observable");
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import weakEvents = require("ui/core/weak-event-listener");
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import types = require("utils/types");
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import trace = require("trace");
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import bindingBuilder = require("../builder/binding-builder");
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import viewModule = require("ui/core/view");
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import * as applicationModule from "application";
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import * as polymerExpressionsModule from "js-libs/polymer-expressions";
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import * as specialPropertiesModule from "ui/builder/special-properties";
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import * as utils from "utils/utils";
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//late import
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var application: typeof applicationModule;
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function ensureApplication() {
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if (!application) {
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application = require("application");
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}
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}
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var expressions: typeof polymerExpressionsModule;
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function ensureExpressions() {
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if (!expressions) {
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expressions = require("js-libs/polymer-expressions");
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}
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}
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var specialProperties: typeof specialPropertiesModule;
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function ensureSpecialProperties() {
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if (!specialProperties) {
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specialProperties = require("ui/builder/special-properties");
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}
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}
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var bindingContextProperty = new dependencyObservable.Property(
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"bindingContext",
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"Bindable",
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new dependencyObservable.PropertyMetadata(undefined, dependencyObservable.PropertyMetadataSettings.Inheritable, onBindingContextChanged)
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);
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function onBindingContextChanged(data: dependencyObservable.PropertyChangeData) {
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var bindable = <Bindable>data.object;
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bindable._onBindingContextChanged(data.oldValue, data.newValue);
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}
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var contextKey = "context";
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// this regex is used to get parameters inside [] for example:
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// from $parents['ListView'] will return 'ListView'
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// from $parents[1] will return 1
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var paramsRegex = /\[\s*(['"])*(\w*)\1\s*\]/;
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var bc = bindingBuilder.bindingConstants;
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export class Bindable extends dependencyObservable.DependencyObservable implements definition.Bindable {
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public static bindingContextProperty = bindingContextProperty;
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// TODO: Implement with WeakRef to prevent memory leaks.
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private _bindings: Object;
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private get bindings(): Object {
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if (!this._bindings) {
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this._bindings = {};
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}
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return this._bindings;
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}
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get bindingContext(): Object {
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return this._getValue(Bindable.bindingContextProperty);
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}
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set bindingContext(value: Object) {
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this._setValue(Bindable.bindingContextProperty, value);
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}
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public bind(options: definition.BindingOptions, source?: Object) {
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var binding: Binding = this.bindings[options.targetProperty];
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if (binding) {
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binding.unbind();
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}
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binding = new Binding(this, options);
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this.bindings[options.targetProperty] = binding;
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var bindingSource = source;
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if (!bindingSource) {
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bindingSource = this.bindingContext;
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binding.sourceIsBindingContext = true;
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}
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if (!types.isNullOrUndefined(bindingSource)) {
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binding.bind(bindingSource);
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}
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}
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public unbind(property: string) {
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var binding: Binding = this.bindings[property];
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if (binding) {
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binding.unbind();
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delete this.bindings[property];
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}
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}
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public _updateTwoWayBinding(propertyName: string, value: any) {
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var binding: Binding = this.bindings[propertyName];
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if (binding) {
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binding.updateTwoWay(value);
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}
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}
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public _setCore(data: observable.PropertyChangeData) {
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super._setCore(data);
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this._updateTwoWayBinding(data.propertyName, data.value);
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}
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public _onPropertyChanged(property: dependencyObservable.Property, oldValue: any, newValue: any) {
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trace.write(`${this}._onPropertyChanged(${property.name}, ${oldValue}, ${newValue})`, trace.categories.Binding);
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super._onPropertyChanged(property, oldValue, newValue);
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if (this instanceof viewModule.View) {
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if (property.metadata.inheritable && (<viewModule.View>(<any>this))._isInheritedChange() === true) {
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return;
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}
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}
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var binding = this.bindings[property.name];
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if (binding && !binding.updating) {
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if (binding.options.twoWay) {
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trace.write(`${this}._updateTwoWayBinding(${property.name}, ${newValue});` + property.name, trace.categories.Binding);
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this._updateTwoWayBinding(property.name, newValue);
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}
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else {
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trace.write(`${this}.unbind(${property.name});`, trace.categories.Binding);
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this.unbind(property.name);
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}
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}
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}
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public _onBindingContextChanged(oldValue: any, newValue: any) {
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var binding: Binding;
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for (var p in this.bindings) {
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binding = this.bindings[p];
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if (binding.updating || !binding.sourceIsBindingContext) {
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continue;
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}
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trace.write(`Binding ${binding.target.get()}.${binding.options.targetProperty} to new context ${newValue}`, trace.categories.Binding);
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binding.unbind();
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if (!types.isNullOrUndefined(newValue)) {
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binding.bind(newValue);
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}
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}
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}
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}
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export class Binding {
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options: definition.BindingOptions;
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updating = false;
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sourceIsBindingContext: boolean;
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source: WeakRef<Object>;
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target: WeakRef<Bindable>;
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public loadedHandlerVisualTreeBinding(args) {
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var targetInstance = args.object;
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targetInstance.off(viewModule.View.loadedEvent, this.loadedHandlerVisualTreeBinding, this);
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this.unbind();
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if (!types.isNullOrUndefined(targetInstance.bindingContext)) {
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this.bind(targetInstance.bindingContext);
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}
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};
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private propertyChangeListeners = {};
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private sourceOptions: { instance: WeakRef<any>; property: any };
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private targetOptions: { instance: WeakRef<any>; property: any };
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private sourcePropertiesArray: Array<string>;
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constructor(target: Bindable, options: definition.BindingOptions) {
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this.target = new WeakRef(target);
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this.options = options;
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}
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public bind(obj: Object) {
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if (types.isNullOrUndefined(obj)) {
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throw new Error("Expected valid object reference as a source in the Binding.bind method.");
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}
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/* tslint:disable */
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if (typeof (obj) === "number") {
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obj = new Number(obj);
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}
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if (typeof (obj) === "boolean") {
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obj = new Boolean(obj);
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}
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if (typeof (obj) === "string") {
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obj = new String(obj);
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}
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/* tslint:enable */
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this.source = new WeakRef(obj);
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this.updateTarget(this.getSourcePropertyValue());
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if (!this.sourceOptions) {
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this.sourceOptions = this.resolveOptions(this.source, this.getSourceProperties());
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}
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this.addPropertyChangeListeners(this.source, this.getSourceProperties());
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}
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private getSourceProperties(): Array<string> {
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if (!this.sourcePropertiesArray) {
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this.sourcePropertiesArray = Binding.getProperties(this.options.sourceProperty);
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}
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return this.sourcePropertiesArray;
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}
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private static getProperties(property: string): Array<string> {
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var result: Array<string>;
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if (property) {
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// first replace all '$parents[..]' with a safe string
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// second removes all ] since they are not important for property access and not needed
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// then split properties either on '.' or '['
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var parentsMatches = property.match(bindingBuilder.parentsRegex);
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result = property.replace(bindingBuilder.parentsRegex, "parentsMatch")
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.replace(/\]/g, "")
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.split(/\.|\[/);
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var i;
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var resultLength = result.length;
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var parentsMatchesCounter = 0;
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for (i = 0; i < resultLength; i++) {
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if (result[i] === "parentsMatch") {
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result[i] = parentsMatches[parentsMatchesCounter];
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parentsMatchesCounter++;
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}
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}
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return result;
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}
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else {
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return [];
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}
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}
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private resolveObjectsAndProperties(source: Object, propsArray: Array<string>) {
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var result = [];
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var i;
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var propsArrayLength = propsArray.length;
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var currentObject = source;
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var objProp = "";
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var currentObjectChanged = false;
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for (i = 0; i < propsArrayLength; i++) {
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objProp = propsArray[i];
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if (propsArray[i] === bc.bindingValueKey) {
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currentObjectChanged = true;
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}
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if (propsArray[i] === bc.parentValueKey || propsArray[i].indexOf(bc.parentsValueKey) === 0) {
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var parentView = this.getParentView(this.target.get(), propsArray[i]).view;
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if (parentView) {
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currentObject = parentView.bindingContext;
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}
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else {
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var targetInstance = this.target.get();
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targetInstance.off(viewModule.View.loadedEvent, this.loadedHandlerVisualTreeBinding, this);
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targetInstance.on(viewModule.View.loadedEvent, this.loadedHandlerVisualTreeBinding, this);
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}
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currentObjectChanged = true;
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}
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result.push({ instance: currentObject, property: objProp });
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// do not need to dive into last object property getter on binding stage will handle it
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if (!currentObjectChanged && (i < propsArrayLength - 1)) {
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currentObject = currentObject ? currentObject[propsArray[i]] : null;
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}
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currentObjectChanged = false;
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}
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return result;
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}
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private addPropertyChangeListeners(source: WeakRef<Object>, sourceProperty: Array<string>) {
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var objectsAndProperties = this.resolveObjectsAndProperties(source.get(), sourceProperty)
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var objectsAndPropertiesLength = objectsAndProperties.length;
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if (objectsAndPropertiesLength > 0) {
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var i;
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for (i = 0; i < objectsAndPropertiesLength; i++) {
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var prop = objectsAndProperties[i].property;
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var currentObject = objectsAndProperties[i].instance;
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if (currentObject && !this.propertyChangeListeners[prop] && currentObject instanceof observable.Observable) {
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weakEvents.addWeakEventListener(
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currentObject,
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observable.Observable.propertyChangeEvent,
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this.onSourcePropertyChanged,
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this);
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this.propertyChangeListeners[prop] = currentObject;
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}
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}
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}
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}
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public unbind() {
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if (!this.source) {
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return;
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}
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var i;
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var propertyChangeListenersKeys = Object.keys(this.propertyChangeListeners);
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for (i = 0; i < propertyChangeListenersKeys.length; i++) {
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weakEvents.removeWeakEventListener(
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this.propertyChangeListeners[propertyChangeListenersKeys[i]],
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observable.Observable.propertyChangeEvent,
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this.onSourcePropertyChanged,
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this);
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delete this.propertyChangeListeners[propertyChangeListenersKeys[i]];
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}
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if (this.source) {
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this.source.clear();
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}
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if (this.sourceOptions) {
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this.sourceOptions.instance.clear();
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this.sourceOptions = undefined;
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}
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if (this.targetOptions) {
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this.targetOptions = undefined;
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}
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this.sourcePropertiesArray = undefined;
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}
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private prepareExpressionForUpdate(): string {
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// this regex is used to create a valid RegExp object from a string that has some special regex symbols like [,(,$ and so on.
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// Basically this method replaces all matches of 'source property' in expression with '$newPropertyValue'.
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// For example: with an expression similar to:
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// text="{{ sourceProperty = $parents['ListView'].test, expression = $parents['ListView'].test + 2}}"
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// update expression will be '$newPropertyValue + 2'
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// then on expression execution the new value will be taken and target property will be updated with the value of the expression.
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var escapedSourceProperty = utils.escapeRegexSymbols(this.options.sourceProperty);
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var expRegex = new RegExp(escapedSourceProperty, 'g');
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var resultExp = this.options.expression.replace(expRegex, bc.newPropertyValueKey);
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return resultExp;
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}
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public updateTwoWay(value: any) {
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if (this.updating) {
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return;
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}
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if (this.options.twoWay) {
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if (this.options.expression) {
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var changedModel = {};
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changedModel[bc.bindingValueKey] = value;
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changedModel[bc.newPropertyValueKey] = value;
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var sourcePropertyName = "";
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if (this.sourceOptions) {
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sourcePropertyName = this.sourceOptions.property;
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}
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else if (typeof this.options.sourceProperty === "string" && this.options.sourceProperty.indexOf(".") === -1) {
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sourcePropertyName = this.options.sourceProperty;
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}
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if (sourcePropertyName !== "") {
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changedModel[sourcePropertyName] = value;
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}
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var updateExpression = this.prepareExpressionForUpdate();
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this.prepareContextForExpression(changedModel, updateExpression);
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var expressionValue = this._getExpressionValue(updateExpression, true, changedModel);
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if (expressionValue instanceof Error) {
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trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
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}
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else {
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this.updateSource(expressionValue);
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}
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}
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else {
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this.updateSource(value);
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}
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}
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}
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private _getExpressionValue(expression: string, isBackConvert: boolean, changedModel: any): any {
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try {
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ensureExpressions();
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var exp = expressions.PolymerExpressions.getExpression(expression);
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if (exp) {
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var context = this.source && this.source.get && this.source.get() || global;
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var model = {};
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ensureApplication();
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for (var prop in application.resources) {
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if (application.resources.hasOwnProperty(prop) && !context.hasOwnProperty(prop)) {
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context[prop] = application.resources[prop];
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}
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}
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this.prepareContextForExpression(context, expression);
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model[contextKey] = context;
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return exp.getValue(model, isBackConvert, changedModel ? changedModel : model);
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}
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return new Error(expression + " is not a valid expression.");
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}
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catch (e) {
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var errorMessage = "Run-time error occured in file: " + e.sourceURL + " at line: " + e.line + " and column: " + e.column;
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return new Error(errorMessage);
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}
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}
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public onSourcePropertyChanged(data: observable.PropertyChangeData) {
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if (this.options.expression) {
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var expressionValue = this._getExpressionValue(this.options.expression, false, undefined);
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if (expressionValue instanceof Error) {
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trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
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}
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else {
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this.updateTarget(expressionValue);
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}
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} else {
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var propIndex = this.getSourceProperties().indexOf(data.propertyName);
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if (propIndex > -1) {
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var props = this.getSourceProperties().slice(propIndex + 1);
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var propsLength = props.length;
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if (propsLength > 0) {
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var value = data.value;
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var i;
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for (i = 0; i < propsLength; i++) {
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value = value[props[i]];
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}
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this.updateTarget(value);
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}
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else if (data.propertyName === this.sourceOptions.property) {
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this.updateTarget(data.value);
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}
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}
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}
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var sourceProps = Binding.getProperties(this.options.sourceProperty);
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var sourcePropsLength = sourceProps.length;
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var changedPropertyIndex = sourceProps.indexOf(data.propertyName);
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if (changedPropertyIndex > -1) {
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var probablyChangedObject = this.propertyChangeListeners[sourceProps[changedPropertyIndex + 1]];
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if (probablyChangedObject &&
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probablyChangedObject !== data.object[sourceProps[changedPropertyIndex]]) {
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// remove all weakevent listeners after change, because changed object replaces object that is hooked for
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// propertyChange event
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for (i = sourcePropsLength - 1; i > changedPropertyIndex; i--) {
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weakEvents.removeWeakEventListener(
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this.propertyChangeListeners[sourceProps[i]],
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observable.Observable.propertyChangeEvent,
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this.onSourcePropertyChanged,
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this);
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delete this.propertyChangeListeners[sourceProps[i]];
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}
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//var newProps = this.options.sourceProperty.substr(this.options.sourceProperty.indexOf(data.propertyName) + data.propertyName.length + 1);
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var newProps = sourceProps.slice(changedPropertyIndex + 1);
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// add new weakevent listeners
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this.addPropertyChangeListeners(new WeakRef(data.object[sourceProps[changedPropertyIndex]]), newProps);
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}
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}
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}
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private prepareContextForExpression(model, expression) {
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var parentViewAndIndex;
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var parentView;
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if (expression.indexOf(bc.bindingValueKey) > -1) {
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model[bc.bindingValueKey] = model;
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}
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if (expression.indexOf(bc.parentValueKey) > -1) {
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parentView = this.getParentView(this.target.get(), bc.parentValueKey).view;
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if (parentView) {
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model[bc.parentValueKey] = parentView.bindingContext;
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}
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}
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var parentsArray = expression.match(bindingBuilder.parentsRegex);
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if (parentsArray) {
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var i;
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for (i = 0; i < parentsArray.length; i++) {
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parentViewAndIndex = this.getParentView(this.target.get(), parentsArray[i]);
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if (parentViewAndIndex.view) {
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model[bc.parentsValueKey] = model[bc.parentsValueKey] || {};
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model[bc.parentsValueKey][parentViewAndIndex.index] = parentViewAndIndex.view.bindingContext;
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}
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}
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}
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}
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private getSourcePropertyValue() {
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if (this.options.expression) {
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var changedModel = {};
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changedModel[bc.bindingValueKey] = this.source.get();
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var expressionValue = this._getExpressionValue(this.options.expression, false, changedModel);
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if (expressionValue instanceof Error) {
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trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
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}
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else {
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return expressionValue;
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}
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}
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if (!this.sourceOptions) {
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this.sourceOptions = this.resolveOptions(this.source, this.getSourceProperties());
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}
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var value;
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if (this.sourceOptions) {
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var sourceOptionsInstance = this.sourceOptions.instance.get();
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if (this.sourceOptions.property === bc.bindingValueKey) {
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value = sourceOptionsInstance;
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}
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else if (sourceOptionsInstance instanceof observable.Observable) {
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value = sourceOptionsInstance.get(this.sourceOptions.property);
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}
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else if (sourceOptionsInstance && this.sourceOptions.property &&
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this.sourceOptions.property in sourceOptionsInstance) {
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value = sourceOptionsInstance[this.sourceOptions.property];
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}
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}
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return value;
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}
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private updateTarget(value: any) {
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|
if (this.updating || (!this.target || !this.target.get())) {
|
|
return;
|
|
}
|
|
|
|
if (!this.targetOptions) {
|
|
this.targetOptions = this.resolveOptions(this.target, Binding.getProperties(this.options.targetProperty));
|
|
}
|
|
|
|
this.updateOptions(this.targetOptions, value);
|
|
}
|
|
|
|
private updateSource(value: any) {
|
|
if (this.updating || (!this.source || !this.source.get())) {
|
|
return;
|
|
}
|
|
|
|
if (!this.sourceOptions) {
|
|
this.sourceOptions = this.resolveOptions(this.source, this.getSourceProperties());
|
|
}
|
|
|
|
this.updateOptions(this.sourceOptions, value);
|
|
}
|
|
|
|
private getParentView(target, property) {
|
|
if (!target || !(target instanceof viewModule.View)) {
|
|
return { view: null, index: null };
|
|
}
|
|
|
|
var result;
|
|
if (property === bc.parentValueKey) {
|
|
result = target.parent;
|
|
}
|
|
|
|
if (property.indexOf(bc.parentsValueKey) === 0) {
|
|
result = target.parent;
|
|
var indexParams = paramsRegex.exec(property);
|
|
var index;
|
|
if (indexParams && indexParams.length > 1) {
|
|
index = indexParams[2];
|
|
}
|
|
|
|
if (!isNaN(index)) {
|
|
var indexAsInt = parseInt(index);
|
|
while (indexAsInt > 0) {
|
|
result = result.parent;
|
|
indexAsInt--;
|
|
}
|
|
}
|
|
else if (types.isString(index)) {
|
|
while (result && result.typeName !== index) {
|
|
result = result.parent;
|
|
}
|
|
}
|
|
}
|
|
|
|
return { view: result, index: index };
|
|
}
|
|
|
|
private resolveOptions(obj: WeakRef<any>, properties: Array<string>): { instance: any; property: any } {
|
|
var objectsAndProperties = this.resolveObjectsAndProperties(obj.get(), properties);
|
|
if (objectsAndProperties.length > 0) {
|
|
var resolvedObj = objectsAndProperties[objectsAndProperties.length - 1].instance;
|
|
var prop = objectsAndProperties[objectsAndProperties.length - 1].property;
|
|
if (resolvedObj) {
|
|
return {
|
|
instance: new WeakRef(resolvedObj),
|
|
property: prop
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private updateOptions(options: { instance: WeakRef<any>; property: any }, value: any) {
|
|
var optionsInstance;
|
|
if (options && options.instance) {
|
|
optionsInstance = options.instance.get();
|
|
}
|
|
if (!optionsInstance) {
|
|
return;
|
|
}
|
|
|
|
this.updating = true;
|
|
|
|
try {
|
|
if (optionsInstance instanceof Bindable &&
|
|
viewModule.isEventOrGesture(options.property, optionsInstance) &&
|
|
types.isFunction(value)) {
|
|
// calling off method with null as handler will remove all handlers for options.property event
|
|
optionsInstance.off(options.property, null, optionsInstance.bindingContext);
|
|
optionsInstance.on(options.property, value, optionsInstance.bindingContext);
|
|
} else {
|
|
ensureSpecialProperties();
|
|
|
|
let specialSetter = specialProperties.getSpecialPropertySetter(options.property);
|
|
if (specialSetter) {
|
|
specialSetter(optionsInstance, value);
|
|
} else {
|
|
if (optionsInstance instanceof observable.Observable) {
|
|
optionsInstance.set(options.property, value);
|
|
} else {
|
|
optionsInstance[options.property] = value;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch (ex) {
|
|
trace.write("Binding error while setting property " + options.property + " of " + optionsInstance + ": " + ex,
|
|
trace.categories.Binding,
|
|
trace.messageType.error);
|
|
}
|
|
|
|
this.updating = false;
|
|
}
|
|
}
|