mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-08-15 19:26:42 +08:00
106 lines
3.9 KiB
TypeScript
106 lines
3.9 KiB
TypeScript
import bindable = require("ui/core/bindable");
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import dependencyObservable = require("ui/core/dependency-observable");
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import definition = require("ui/core/proxy");
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import * as platform from "platform";
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import * as types from "utils/types";
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import * as observable from "data/observable";
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export class PropertyMetadata extends dependencyObservable.PropertyMetadata implements definition.PropertyMetadata {
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private _onSetNativeValue: dependencyObservable.PropertyChangedCallback;
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constructor(
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defaultValue: any,
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options?: number,
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onChanged?: dependencyObservable.PropertyChangedCallback,
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onValidateValue?: dependencyObservable.PropertyValidationCallback,
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onSetNativeValue?: dependencyObservable.PropertyChangedCallback) {
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super(defaultValue, options, onChanged, onValidateValue);
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this._onSetNativeValue = onSetNativeValue;
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}
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get onSetNativeValue(): dependencyObservable.PropertyChangedCallback {
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return this._onSetNativeValue;
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}
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set onSetNativeValue(value: dependencyObservable.PropertyChangedCallback) {
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this._onSetNativeValue = value;
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}
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}
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export class ProxyObject extends bindable.Bindable implements definition.ProxyObject {
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private _updatingJSPropertiesDict = {};
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/**
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* Gets the android-specific native instance that lies behind this proxy. Will be available if running on an Android platform.
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*/
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get android(): any {
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return undefined;
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}
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/**
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* Gets the ios-specific native instance that lies behind this proxy. Will be available if running on an iOS platform.
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*/
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get ios(): any {
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return undefined;
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}
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public _onPropertyChanged(property: dependencyObservable.Property, oldValue: any, newValue: any) {
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super._onPropertyChanged(property, oldValue, newValue);
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this._trySetNativeValue(property, oldValue, newValue);
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}
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/**
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* A property has changed on the native side directly - e.g. the user types in a TextField.
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*/
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public _onPropertyChangedFromNative(property: dependencyObservable.Property, newValue: any) {
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if (this._updatingJSPropertiesDict[property.name]) {
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return;
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}
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this._updatingJSPropertiesDict[property.name] = true;
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this._setValue(property, newValue);
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delete this._updatingJSPropertiesDict[property.name];
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}
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public _syncNativeProperties() {
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var that = this;
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var eachPropertyCallback = function (property: dependencyObservable.Property): boolean {
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that._trySetNativeValue(property);
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return true;
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}
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this._eachSetProperty(eachPropertyCallback);
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}
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private _trySetNativeValue(property: dependencyObservable.Property, oldValue?:any, newValue?: any) {
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if (this._updatingJSPropertiesDict[property.name]) {
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// 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
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return;
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}
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if (platform.device.os === platform.platformNames.android && !this.android) {
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// in android we have lazy loading and we do not have a native widget created yet, do not call the onSetNativeValue callback
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// properties will be synced when the widget is created
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return;
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}
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var metadata = property.metadata;
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if (!(metadata instanceof PropertyMetadata)) {
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return;
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}
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var proxyMetadata = <PropertyMetadata>metadata;
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if (proxyMetadata.onSetNativeValue) {
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if (types.isUndefined(newValue)) {
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newValue = this._getValue(property);
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}
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proxyMetadata.onSetNativeValue({
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object: this,
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property: property,
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eventName: observable.Observable.propertyChangeEvent,
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newValue: newValue,
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oldValue: oldValue
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});
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}
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}
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} |