Files
NativeScript/ui/core/proxy.ts
2016-01-25 16:33:18 +02:00

106 lines
3.9 KiB
TypeScript

import bindable = require("ui/core/bindable");
import dependencyObservable = require("ui/core/dependency-observable");
import definition = require("ui/core/proxy");
import * as platform from "platform";
import * as types from "utils/types";
import * as observable from "data/observable";
export class PropertyMetadata extends dependencyObservable.PropertyMetadata implements definition.PropertyMetadata {
private _onSetNativeValue: dependencyObservable.PropertyChangedCallback;
constructor(
defaultValue: any,
options?: number,
onChanged?: dependencyObservable.PropertyChangedCallback,
onValidateValue?: dependencyObservable.PropertyValidationCallback,
onSetNativeValue?: dependencyObservable.PropertyChangedCallback) {
super(defaultValue, options, onChanged, onValidateValue);
this._onSetNativeValue = onSetNativeValue;
}
get onSetNativeValue(): dependencyObservable.PropertyChangedCallback {
return this._onSetNativeValue;
}
set onSetNativeValue(value: dependencyObservable.PropertyChangedCallback) {
this._onSetNativeValue = value;
}
}
export class ProxyObject extends bindable.Bindable implements definition.ProxyObject {
private _updatingJSPropertiesDict = {};
/**
* Gets the android-specific native instance that lies behind this proxy. Will be available if running on an Android platform.
*/
get android(): any {
return undefined;
}
/**
* Gets the ios-specific native instance that lies behind this proxy. Will be available if running on an iOS platform.
*/
get ios(): any {
return undefined;
}
public _onPropertyChanged(property: dependencyObservable.Property, oldValue: any, newValue: any) {
super._onPropertyChanged(property, oldValue, newValue);
this._trySetNativeValue(property, oldValue, newValue);
}
/**
* A property has changed on the native side directly - e.g. the user types in a TextField.
*/
public _onPropertyChangedFromNative(property: dependencyObservable.Property, newValue: any) {
if (this._updatingJSPropertiesDict[property.name]) {
return;
}
this._updatingJSPropertiesDict[property.name] = true;
this._setValue(property, newValue);
delete this._updatingJSPropertiesDict[property.name];
}
public _syncNativeProperties() {
var that = this;
var eachPropertyCallback = function (property: dependencyObservable.Property): boolean {
that._trySetNativeValue(property);
return true;
}
this._eachSetProperty(eachPropertyCallback);
}
private _trySetNativeValue(property: dependencyObservable.Property, oldValue?:any, newValue?: any) {
if (this._updatingJSPropertiesDict[property.name]) {
// This is the case when a property has changed from the native side directly and we have received the "_onPropertyChanged" event while synchronizing our local cache
return;
}
if (platform.device.os === platform.platformNames.android && !this.android) {
// in android we have lazy loading and we do not have a native widget created yet, do not call the onSetNativeValue callback
// properties will be synced when the widget is created
return;
}
var metadata = property.metadata;
if (!(metadata instanceof PropertyMetadata)) {
return;
}
var proxyMetadata = <PropertyMetadata>metadata;
if (proxyMetadata.onSetNativeValue) {
if (types.isUndefined(newValue)) {
newValue = this._getValue(property);
}
proxyMetadata.onSetNativeValue({
object: this,
property: property,
eventName: observable.Observable.propertyChangeEvent,
newValue: newValue,
oldValue: oldValue
});
}
}
}