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Copy pathbindable.ts
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345 lines (289 loc) · 12 KB
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import observable = require("data/observable");
import definition = require("ui/core/bindable");
import dependencyObservable = require("ui/core/dependency-observable");
import weakEventListener = require("ui/core/weak-event-listener");
import types = require("utils/types");
import trace = require("trace");
import polymerExpressions = require("js-libs/polymer-expressions");
var bindingContextProperty = new dependencyObservable.Property(
"bindingContext",
"Bindable",
new dependencyObservable.PropertyMetadata(undefined, dependencyObservable.PropertyMetadataSettings.Inheritable) // TODO: Metadata options?
);
export class Bindable extends dependencyObservable.DependencyObservable implements definition.Bindable {
public static bindingContextProperty = bindingContextProperty;
// TODO: Implement with WeakRef to prevent memory leaks.
private _bindings = {};
get bindingContext(): Object {
return this._getValue(Bindable.bindingContextProperty);
}
set bindingContext(value: Object) {
this._setValue(Bindable.bindingContextProperty, value);
}
public bind(options: definition.BindingOptions, source?: Object) {
var binding: Binding = this._bindings[options.targetProperty];
if (binding) {
binding.unbind();
}
binding = new Binding(this, options);
this._bindings[options.targetProperty] = binding;
var bindingSource = source;
if (!bindingSource) {
bindingSource = this.bindingContext;
}
if (bindingSource) {
binding.bind(bindingSource);
}
}
public unbind(property: string) {
var binding: Binding = this._bindings[property];
if (binding) {
binding.unbind();
delete this._bindings[property];
}
}
public _updateTwoWayBinding(propertyName: string, value: any) {
var binding: Binding = this._bindings[propertyName];
if (binding) {
binding.updateTwoWay(value);
}
}
public _setCore(data: observable.PropertyChangeData) {
super._setCore(data);
this._updateTwoWayBinding(data.propertyName, data.value);
}
public _onPropertyChanged(property: dependencyObservable.Property, oldValue: any, newValue: any) {
trace.write("Bindable._onPropertyChanged(" + this + ") " + property.name, trace.categories.Binding);
super._onPropertyChanged(property, oldValue, newValue);
if (property === Bindable.bindingContextProperty) {
this._onBindingContextChanged(oldValue, newValue);
}
var binding = this._bindings[property.name];
if (binding) {
// we should remove (unbind and delete) binding if binding is oneWay and update is not triggered
// by binding itself.
var shouldRemoveBinding = !binding.updating && !binding.options.twoWay;
if (shouldRemoveBinding) {
trace.write("_onPropertyChanged(" + this + ") removing binding for property: " + property.name, trace.categories.Binding);
this.unbind(property.name);
}
else {
trace.write("_updateTwoWayBinding(" + this + "): " + property.name, trace.categories.Binding);
this._updateTwoWayBinding(property.name, newValue);
}
}
}
public _onBindingContextChanged(oldValue: any, newValue: any) {
var binding: Binding;
for (var p in this._bindings) {
binding = this._bindings[p];
if (binding.options.targetProperty === Bindable.bindingContextProperty.name && binding.updating) {
// Updating binding context trough binding should not rebind the binding context.
continue;
}
if (binding.source && binding.source.get() !== oldValue) {
// Binding has its source set directly, not through binding context, do not bind/unbind in this case
continue;
}
trace.write(
"Binding target: " + binding.target.get() +
" targetProperty: " + binding.options.targetProperty +
" to the changed context: " + newValue, trace.categories.Binding);
binding.unbind();
if (newValue) {
binding.bind(newValue);
}
}
}
}
export class Binding {
options: definition.BindingOptions;
updating = false;
source: WeakRef<Object>;
target: WeakRef<Bindable>;
weakEventListenerOptions: weakEventListener.WeakEventListenerOptions;
weakEL = weakEventListener.WeakEventListener;
private sourceOptions: { instance: WeakRef<any>; property: any };
private targetOptions: { instance: WeakRef<any>; property: any };
constructor(target: Bindable, options: definition.BindingOptions) {
this.target = new WeakRef(target);
this.options = options;
}
public bind(obj: Object) {
if (!obj) {
throw new Error("Expected valid object reference as a source in the Binding.bind method.");
}
/* tslint:disable */
if (typeof (obj) === "number") {
obj = new Number(obj);
}
if (typeof (obj) === "boolean") {
obj = new Boolean(obj);
}
if (typeof (obj) === "string") {
obj = new String(obj);
}
/* tslint:enable */
this.source = new WeakRef(obj);
this.updateTarget(this.getSourceProperty());
if (!this.sourceOptions) {
this.sourceOptions = this.resolveOptions(this.source, this.options.sourceProperty);
}
var sourceOptionsInstance = this.sourceOptions.instance.get();
if (sourceOptionsInstance instanceof observable.Observable) {
this.weakEventListenerOptions = {
targetWeakRef: this.target,
sourceWeakRef: this.sourceOptions.instance,
eventName: observable.knownEvents.propertyChange,
handler: this.onSourcePropertyChanged,
handlerContext: this,
key: this.options.targetProperty
}
this.weakEL.addWeakEventListener(this.weakEventListenerOptions);
}
}
public unbind() {
if (!this.source) {
return;
}
this.weakEL.removeWeakEventListener(this.weakEventListenerOptions);
this.weakEventListenerOptions = undefined;
this.source.clear();
this.sourceOptions.instance.clear();
this.sourceOptions = undefined;
this.targetOptions = undefined;
}
public updateTwoWay(value: any) {
if (this.options.twoWay) {
if (this._isExpression(this.options.expression)) {
var changedModel = {};
changedModel[this.options.sourceProperty] = value;
var expressionValue = this._getExpressionValue(this.options.expression, true, changedModel);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
this.updateSource(expressionValue);
}
}
else {
this.updateSource(value);
}
}
}
private _isExpression(expression: string): boolean {
if (expression) {
var result = expression.indexOf(" ") !== -1;
return result;
}
else {
return false;
}
}
private _getExpressionValue(expression: string, isBackConvert: boolean, changedModel: any): any {
try {
var exp = polymerExpressions.PolymerExpressions.getExpression(expression);
if (exp) {
var context = this.source && this.source.get && this.source.get() || global;
return exp.getValue(context, isBackConvert, changedModel);
}
return new Error(expression + " is not a valid expression.");
}
catch (e) {
var errorMessage = "Run-time error occured in file: " + e.sourceURL + " at line: " + e.line + " and column: " + e.column;
return new Error(errorMessage);
}
}
public onSourcePropertyChanged(data: observable.PropertyChangeData) {
if (this._isExpression(this.options.expression)) {
var expressionValue = this._getExpressionValue(this.options.expression, false, undefined);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
this.updateTarget(expressionValue);
}
} else if (data.propertyName === this.options.sourceProperty) {
this.updateTarget(data.value);
}
}
private getSourceProperty() {
if (this._isExpression(this.options.expression)) {
var expressionValue = this._getExpressionValue(this.options.expression, false, undefined);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
return expressionValue;
}
}
if (!this.sourceOptions) {
this.sourceOptions = this.resolveOptions(this.source, this.options.sourceProperty);
}
var value;
var sourceOptionsInstance = this.sourceOptions.instance.get();
if (sourceOptionsInstance instanceof observable.Observable) {
value = sourceOptionsInstance.get(this.sourceOptions.property);
} else if (sourceOptionsInstance && this.sourceOptions.property &&
this.sourceOptions.property in sourceOptionsInstance) {
value = sourceOptionsInstance[this.sourceOptions.property];
}
return value;
}
private updateTarget(value: any) {
if (this.updating || (!this.target || !this.target.get())) {
return;
}
if (!this.targetOptions) {
this.targetOptions = this.resolveOptions(this.target, 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.options.sourceProperty);
}
this.updateOptions(this.sourceOptions, value);
}
private resolveOptions(obj: WeakRef<any>, property: string): { instance: any; property: any } {
var options;
if (!this._isExpression(property) && types.isString(property) && property.indexOf(".") !== -1) {
var properties = property.split(".");
var i: number;
var currentObject = obj.get();
for (i = 0; i < properties.length - 1; i++) {
currentObject = currentObject[properties[i]];
}
options = {
instance: new WeakRef(currentObject),
property: properties[properties.length - 1]
}
} else {
options = {
instance: obj,
property: property
}
}
return options;
}
private updateOptions(options: { instance: WeakRef<any>; property: any }, value: any) {
this.updating = true;
var optionsInstance = options.instance.get();
try {
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;
}
}