mirror of
https://github.com/NativeScript/NativeScript.git
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644 lines
22 KiB
TypeScript
644 lines
22 KiB
TypeScript
// Types
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import { ViewBase } from '../view-base';
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// Requires
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import { unsetValue } from '../properties';
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import { Observable, WrappedValue, PropertyChangeData, EventData } from '../../../data/observable';
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import { addWeakEventListener, removeWeakEventListener } from '../weak-event-listener';
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import { bindingConstants, parentsRegex } from '../../builder/binding-builder';
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import { escapeRegexSymbols } from '../../../utils';
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import { Trace } from '../../../trace';
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import * as types from '../../../utils/types';
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import * as bindableResources from './bindable-resources';
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import * as polymerExpressions from '../../../js-libs/polymer-expressions';
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const 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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const paramsRegex = /\[\s*(['"])*(\w*)\1\s*\]/;
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const bc = bindingConstants;
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const emptyArray = [];
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const propertiesCache = {};
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function getProperties(property: string): Array<string> {
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if (!property) {
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return emptyArray;
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}
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let result: Array<string> = propertiesCache[property];
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if (result) {
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return result;
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}
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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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const parentsMatches = property.match(parentsRegex);
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result = property.replace(parentsRegex, 'parentsMatch').replace(/\]/g, '').split(/\.|\[/);
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let parentsMatchesCounter = 0;
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for (let i = 0, resultLength = result.length; i < resultLength; i++) {
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if (result[i] === 'parentsMatch') {
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result[i] = parentsMatches[parentsMatchesCounter++];
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}
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}
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propertiesCache[property] = result;
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return result;
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}
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/**
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* The options object used in the Bindable.bind method.
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*/
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export interface BindingOptions {
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/**
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* The property name of the source object (typically the ViewModel) to bind to.
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*/
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sourceProperty: string;
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/**
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* The property name of the target object (that is the Bindable instance) to bind the source property to.
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*/
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targetProperty: string;
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/**
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* True to establish a two-way binding, false otherwise. A two-way binding will synchronize both the source and the target property values regardless of which one initiated the change.
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*/
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twoWay?: boolean;
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/**
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* An expression used for calculations (convertions) based on the value of the property.
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*/
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expression?: string;
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}
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/**
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* An interface which defines methods need to create binding value converter.
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*/
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export interface ValueConverter {
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/**
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* A method that will be executed when a value (of the binding property) should be converted to the observable model.
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* For example: user types in a text field, but our business logic requires to store data in a different manner (e.g. in lower case).
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* @param params - An array of parameters where first element is the value of the property and next elements are parameters send to converter.
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*/
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toModel: (...params: any[]) => any;
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/**
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* A method that will be executed when a value should be converted to the UI view. For example we have a date object which should be displayed to the end user in a specific date format.
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* @param params - An array of parameters where first element is the value of the property and next elements are parameters send to converter.
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*/
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toView: (...params: any[]) => any;
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}
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export function getEventOrGestureName(name: string): string {
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return name.indexOf('on') === 0 ? name.substr(2, name.length - 2) : name;
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}
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// NOTE: method fromString from "ui/gestures";
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export function isGesture(eventOrGestureName: string): boolean {
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let t = eventOrGestureName.trim().toLowerCase();
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return t === 'tap' || t === 'doubletap' || t === 'pinch' || t === 'pan' || t === 'swipe' || t === 'rotation' || t === 'longpress' || t === 'touch';
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}
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// TODO: Make this instance function so that we dont need public statc tapEvent = "tap"
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// in controls. They will just override this one and provide their own event support.
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export function isEventOrGesture(name: string, view: ViewBase): boolean {
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if (typeof name === 'string') {
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let eventOrGestureName = getEventOrGestureName(name);
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let evt = `${eventOrGestureName}Event`;
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return (view.constructor && evt in view.constructor) || isGesture(eventOrGestureName.toLowerCase());
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}
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return false;
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}
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export class Binding {
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private source: WeakRef<Object>;
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// TODO: target should be hard reference!
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public target: WeakRef<ViewBase>;
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private sourceOptions: { instance: WeakRef<any>; property: string };
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private targetOptions: { instance: WeakRef<Object>; property: string };
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private sourceProperties: Array<string>;
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private propertyChangeListeners: Map<string, Observable> = new Map<string, Observable>();
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public updating: boolean;
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public sourceIsBindingContext: boolean;
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public options: BindingOptions;
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constructor(target: ViewBase, options: BindingOptions) {
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this.target = new WeakRef(target);
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this.options = options;
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this.sourceProperties = getProperties(options.sourceProperty);
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this.targetOptions = this.resolveOptions(target, getProperties(options.targetProperty));
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if (!this.targetOptions) {
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throw new Error(`Invalid property: ${options.targetProperty} for target: ${target}`);
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}
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if (options.twoWay) {
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const target = this.targetOptions.instance.get();
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if (target instanceof Observable) {
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target.on(`${this.targetOptions.property}Change`, this.onTargetPropertyChanged, this);
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}
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}
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}
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private onTargetPropertyChanged(data: PropertyChangeData): void {
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this.updateTwoWay(data.value);
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}
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public loadedHandlerVisualTreeBinding(args) {
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let target = args.object;
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target.off('loaded', this.loadedHandlerVisualTreeBinding, this);
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const context = target.bindingContext;
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if (context !== undefined && context !== null) {
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this.update(context);
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}
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}
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public clearSource(): void {
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this.propertyChangeListeners.forEach((observable, index, map) => {
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removeWeakEventListener(observable, Observable.propertyChangeEvent, this.onSourcePropertyChanged, this);
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});
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this.propertyChangeListeners.clear();
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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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}
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private sourceAsObject(source: any): any {
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/* tslint:disable */
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let objectType = typeof source;
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if (objectType === 'number') {
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source = new Number(source);
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} else if (objectType === 'boolean') {
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source = new Boolean(source);
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} else if (objectType === 'string') {
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source = new String(source);
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}
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/* tslint:enable */
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return source;
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}
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private bindingContextChanged(data: PropertyChangeData): void {
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const target = this.targetOptions.instance.get();
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if (!target) {
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this.unbind();
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return;
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}
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const value = data.value;
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if (value !== null && value !== undefined) {
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this.update(value);
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} else {
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// TODO: Is this correct?
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// What should happen when bindingContext is null/undefined?
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this.clearBinding();
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}
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// TODO: if oneWay - call target.unbind();
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}
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public bind(source: any): void {
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const target = this.targetOptions.instance.get();
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if (this.sourceIsBindingContext && target instanceof Observable && this.targetOptions.property !== 'bindingContext') {
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target.on('bindingContextChange', this.bindingContextChanged, this);
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}
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this.update(source);
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}
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private update(source: any): void {
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this.clearSource();
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source = this.sourceAsObject(source);
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if (!types.isNullOrUndefined(source)) {
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// TODO: if oneWay - call target.unbind();
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this.source = new WeakRef(source);
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this.sourceOptions = this.resolveOptions(source, this.sourceProperties);
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let sourceValue = this.getSourcePropertyValue();
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this.updateTarget(sourceValue);
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this.addPropertyChangeListeners(this.source, this.sourceProperties);
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} else if (!this.sourceIsBindingContext) {
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// TODO: if oneWay - call target.unbind();
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let sourceValue = this.getSourcePropertyValue();
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this.updateTarget(sourceValue ? sourceValue : source);
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}
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}
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public unbind() {
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const target = this.targetOptions.instance.get();
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if (target instanceof Observable) {
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if (this.options.twoWay) {
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target.off(`${this.targetOptions.property}Change`, this.onTargetPropertyChanged, this);
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}
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if (this.sourceIsBindingContext && this.targetOptions.property !== 'bindingContext') {
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target.off('bindingContextChange', this.bindingContextChanged, this);
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}
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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.sourceProperties = undefined;
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if (!this.source) {
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return;
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}
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this.clearSource();
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}
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// Consider returning single {} instead of array for performance.
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private resolveObjectsAndProperties(source: Object, properties: Array<string>): Array<{ instance: Object; property: string }> {
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let result = [];
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let currentObject = source;
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let currentObjectChanged = false;
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for (let i = 0, propsArrayLength = properties.length; i < propsArrayLength; i++) {
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let property = properties[i];
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if (property === bc.bindingValueKey) {
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currentObjectChanged = true;
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}
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if (property === bc.parentValueKey || property.indexOf(bc.parentsValueKey) === 0) {
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let parentView = this.getParentView(this.target.get(), property).view;
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if (parentView) {
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currentObject = parentView.bindingContext;
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} else {
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let targetInstance = this.target.get();
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targetInstance.off('loaded', this.loadedHandlerVisualTreeBinding, this);
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targetInstance.on('loaded', this.loadedHandlerVisualTreeBinding, this);
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}
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currentObjectChanged = true;
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}
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if (currentObject) {
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result.push({ instance: currentObject, property: property });
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} else {
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break;
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}
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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[properties[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>, parentProperies?: string) {
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let objectsAndProperties = this.resolveObjectsAndProperties(source.get(), sourceProperty);
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let prop = parentProperies || '';
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for (let i = 0, length = objectsAndProperties.length; i < length; i++) {
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const propName = objectsAndProperties[i].property;
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prop += '$' + propName;
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let currentObject = objectsAndProperties[i].instance;
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if (!this.propertyChangeListeners.has(prop) && currentObject instanceof Observable && currentObject._isViewBase) {
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// Add listener for properties created with after 3.0 version
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addWeakEventListener(currentObject, `${propName}Change`, this.onSourcePropertyChanged, this);
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addWeakEventListener(currentObject, Observable.propertyChangeEvent, this.onSourcePropertyChanged, this);
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this.propertyChangeListeners.set(prop, currentObject);
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} else if (!this.propertyChangeListeners.has(prop) && currentObject instanceof Observable) {
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addWeakEventListener(currentObject, Observable.propertyChangeEvent, this.onSourcePropertyChanged, this);
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this.propertyChangeListeners.set(prop, currentObject);
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}
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}
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}
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private prepareExpressionForUpdate(): string {
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// this regex is used to create a valid RegExp object from a string that has some special regex symbols like [,(,$ 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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let escapedSourceProperty = escapeRegexSymbols(this.options.sourceProperty);
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let expRegex = new RegExp(escapedSourceProperty, 'g');
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let resultExp = this.options.expression.replace(expRegex, bc.newPropertyValueKey);
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return resultExp;
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}
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private updateTwoWay(value: any) {
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if (this.updating || !this.options.twoWay) {
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return;
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}
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let newValue = value;
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if (this.options.expression) {
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let changedModel = {};
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changedModel[bc.bindingValueKey] = value;
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changedModel[bc.newPropertyValueKey] = value;
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let sourcePropertyName = '';
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if (this.sourceOptions) {
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sourcePropertyName = this.sourceOptions.property;
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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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let updateExpression = this.prepareExpressionForUpdate();
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this.prepareContextForExpression(changedModel, updateExpression, undefined);
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let 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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newValue = expressionValue;
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}
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this.updateSource(newValue);
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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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let exp = polymerExpressions.PolymerExpressions.getExpression(expression);
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if (exp) {
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let context = (this.source && this.source.get && this.source.get()) || global;
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let model = {};
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let addedProps = [];
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const resources = bindableResources.get();
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for (let prop in resources) {
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if (resources.hasOwnProperty(prop) && !context.hasOwnProperty(prop)) {
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context[prop] = resources[prop];
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addedProps.push(prop);
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}
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}
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this.prepareContextForExpression(context, expression, addedProps);
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model[contextKey] = context;
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let result = exp.getValue(model, isBackConvert, changedModel ? changedModel : model);
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// clear added props
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let addedPropsLength = addedProps.length;
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for (let i = 0; i < addedPropsLength; i++) {
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delete context[addedProps[i]];
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}
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addedProps.length = 0;
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return result;
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}
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return new Error(expression + ' is not a valid expression.');
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} catch (e) {
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let 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: PropertyChangeData) {
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const sourceProps = this.sourceProperties;
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const sourcePropsLength = sourceProps.length;
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let changedPropertyIndex = sourceProps.indexOf(data.propertyName);
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let parentProps = '';
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if (changedPropertyIndex > -1) {
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parentProps = '$' + sourceProps.slice(0, changedPropertyIndex + 1).join('$');
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while (this.propertyChangeListeners.get(parentProps) !== data.object) {
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changedPropertyIndex += sourceProps.slice(changedPropertyIndex + 1).indexOf(data.propertyName) + 1;
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parentProps = '$' + sourceProps.slice(0, changedPropertyIndex + 1).join('$');
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}
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}
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if (this.options.expression) {
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const expressionValue = this._getExpressionValue(this.options.expression, false, undefined);
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if (expressionValue instanceof Error) {
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Trace.write(expressionValue.message, Trace.categories.Binding, Trace.messageType.error);
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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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if (changedPropertyIndex > -1) {
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const props = sourceProps.slice(changedPropertyIndex + 1);
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const propsLength = props.length;
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if (propsLength > 0) {
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let value = data.value;
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for (let 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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} 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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// we need to do this only if nested objects are used as source and some middle object has changed.
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if (changedPropertyIndex > -1 && changedPropertyIndex < sourcePropsLength - 1) {
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const probablyChangedObject = this.propertyChangeListeners.get(parentProps);
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if (probablyChangedObject && 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 (let i = sourcePropsLength - 1; i > changedPropertyIndex; i--) {
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const prop = '$' + sourceProps.slice(0, i + 1).join('$');
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if (this.propertyChangeListeners.has(prop)) {
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removeWeakEventListener(this.propertyChangeListeners.get(prop), Observable.propertyChangeEvent, this.onSourcePropertyChanged, this);
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this.propertyChangeListeners.delete(prop);
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}
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}
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const newProps = sourceProps.slice(changedPropertyIndex + 1);
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// add new weak event listeners
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const newObject = data.object[sourceProps[changedPropertyIndex]];
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if (!types.isNullOrUndefined(newObject) && typeof newObject === 'object') {
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this.addPropertyChangeListeners(new WeakRef(newObject), newProps, parentProps);
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}
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}
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}
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}
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private prepareContextForExpression(model: Object, expression: string, newProps: Array<string>) {
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let parentViewAndIndex: { view: ViewBase; index: number };
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let parentView;
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let addedProps = newProps || [];
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let expressionCP = expression;
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if (expressionCP.indexOf(bc.bindingValueKey) > -1) {
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model[bc.bindingValueKey] = model;
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addedProps.push(bc.bindingValueKey);
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}
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let success: boolean = true;
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let parentsArray = expressionCP.match(parentsRegex);
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if (parentsArray) {
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for (let i = 0; i < parentsArray.length; i++) {
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// This prevents later checks to mistake $parents[] for $parent
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expressionCP = expressionCP.replace(parentsArray[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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addedProps.push(bc.parentsValueKey);
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} else {
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success = false;
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}
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}
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}
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if (expressionCP.indexOf(bc.parentValueKey) > -1) {
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parentView = this.getParentView(this.target.get(), bc.parentValueKey).view;
|
|
if (parentView) {
|
|
model[bc.parentValueKey] = parentView.bindingContext;
|
|
addedProps.push(bc.parentValueKey);
|
|
} else {
|
|
success = false;
|
|
}
|
|
}
|
|
|
|
// For expressions, there are also cases when binding must be updated after component is loaded (e.g. ListView)
|
|
if (!success) {
|
|
let targetInstance = this.target.get();
|
|
targetInstance.off('loaded', this.loadedHandlerVisualTreeBinding, this);
|
|
targetInstance.on('loaded', this.loadedHandlerVisualTreeBinding, this);
|
|
}
|
|
}
|
|
|
|
private getSourcePropertyValue() {
|
|
if (this.options.expression) {
|
|
let changedModel = {};
|
|
changedModel[bc.bindingValueKey] = this.source ? this.source.get() : undefined;
|
|
let expressionValue = this._getExpressionValue(this.options.expression, false, changedModel);
|
|
if (expressionValue instanceof Error) {
|
|
Trace.write((<Error>expressionValue).message, Trace.categories.Binding, Trace.messageType.error);
|
|
} else {
|
|
return expressionValue;
|
|
}
|
|
}
|
|
|
|
if (this.sourceOptions) {
|
|
let sourceOptionsInstance = this.sourceOptions.instance.get();
|
|
if (this.sourceOptions.property === bc.bindingValueKey) {
|
|
return sourceOptionsInstance;
|
|
} else if (sourceOptionsInstance instanceof Observable && this.sourceOptions.property && this.sourceOptions.property !== '') {
|
|
return sourceOptionsInstance.get(this.sourceOptions.property);
|
|
} else if (sourceOptionsInstance && this.sourceOptions.property && this.sourceOptions.property !== '' && this.sourceOptions.property in sourceOptionsInstance) {
|
|
return sourceOptionsInstance[this.sourceOptions.property];
|
|
} else {
|
|
Trace.write("Property: '" + this.sourceOptions.property + "' is invalid or does not exist. SourceProperty: '" + this.options.sourceProperty + "'", Trace.categories.Binding, Trace.messageType.error);
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
public clearBinding() {
|
|
this.clearSource();
|
|
this.updateTarget(unsetValue);
|
|
}
|
|
|
|
private updateTarget(value: any) {
|
|
if (this.updating) {
|
|
return;
|
|
}
|
|
|
|
this.updateOptions(this.targetOptions, types.isNullOrUndefined(value) ? unsetValue : value);
|
|
}
|
|
|
|
private updateSource(value: any) {
|
|
if (this.updating || !this.source || !this.source.get()) {
|
|
return;
|
|
}
|
|
|
|
this.updateOptions(this.sourceOptions, value);
|
|
}
|
|
|
|
private getParentView(target: any, property: string): { view: ViewBase; index: number } {
|
|
if (!target) {
|
|
return { view: null, index: null };
|
|
}
|
|
|
|
let result: ViewBase;
|
|
if (property === bc.parentValueKey) {
|
|
result = target.parent;
|
|
}
|
|
|
|
let index = null;
|
|
if (property.indexOf(bc.parentsValueKey) === 0) {
|
|
result = target.parent;
|
|
let indexParams = paramsRegex.exec(property);
|
|
if (indexParams && indexParams.length > 1) {
|
|
index = indexParams[2];
|
|
}
|
|
|
|
if (!isNaN(index)) {
|
|
let 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: Object, properties: Array<string>): { instance: WeakRef<Object>; property: any } {
|
|
let objectsAndProperties = this.resolveObjectsAndProperties(obj, properties);
|
|
if (objectsAndProperties.length > 0) {
|
|
let resolvedObj = objectsAndProperties[objectsAndProperties.length - 1].instance;
|
|
let prop = objectsAndProperties[objectsAndProperties.length - 1].property;
|
|
|
|
return {
|
|
instance: new WeakRef(this.sourceAsObject(resolvedObj)),
|
|
property: prop,
|
|
};
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
private updateOptions(options: { instance: WeakRef<any>; property: string }, value: any) {
|
|
let optionsInstance;
|
|
if (options && options.instance) {
|
|
optionsInstance = options.instance.get();
|
|
}
|
|
|
|
if (!optionsInstance) {
|
|
return;
|
|
}
|
|
|
|
this.updating = true;
|
|
|
|
try {
|
|
if (isEventOrGesture(options.property, <any>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 if (optionsInstance instanceof 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;
|
|
}
|
|
}
|