pkg/polymer/lib/src/loader.dart - sdk.git - Git at Google

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 part of polymer;

 /// Annotation used to automatically register polymer elements.
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
 }

 /// Metadata used to label static or top-level methods that are called
 /// automatically when loading the library of a custom element.
 const initMethod = const InitMethodAnnotation();

 /// Implementation behind [initMethod]. Only exposed for internal implementation
 /// details
 class InitMethodAnnotation {
   const InitMethodAnnotation();
 }

 /// This method is deprecated. It used to be where polymer initialization
 /// happens, now this is done automatically from bootstrap.dart.
 @deprecated
 Zone initPolymer() {
   window.console.error(_ERROR);
   return Zone.current;
 }

 const _ERROR = '''
 initPolymer is now deprecated. To initialize a polymer app:
   * add to your page: <link rel="import" href="packages/polymer/polymer.html">
   * replace "application/dart" mime-types with "application/dart;component=1"
   * if you use "init.dart", remove it
   * if you have a main, change it into a method annotated with @initMethod
 ''';

 /// True if we're in deployment mode.
 bool _deployMode = false;

 /// Starts polymer by running all [initializers] and hooking the polymer.js
 /// code. **Note**: this function is not meant to be invoked directly by
 /// application developers. It is invoked by a bootstrap entry point that is
 /// automatically generated. During development, this entry point is generated
 /// dynamically in `boot.js`. Similarly, pub-build generates this entry point
 /// for deployment.
 void startPolymer(List<Function> initializers, [bool deployMode = true]) {
   _hookJsPolymer();
   _deployMode = deployMode;

   for (var initializer in initializers) {
     initializer();
   }
 }

 /// To ensure Dart can interoperate with polymer-element registered by
 /// polymer.js, we need to be able to execute Dart code if we are registering
 /// a Dart class for that element. We trigger Dart logic by patching
 /// polymer-element's register function and:
 ///
 /// * if it has a Dart class, run PolymerDeclaration's register.
 /// * otherwise it is a JS prototype, run polymer-element's normal register.
 void _hookJsPolymer() {
   var polymerJs = js.context['Polymer'];
   if (polymerJs == null) {
     throw new StateError('polymer.js must be loaded before polymer.dart, please'
         ' add <link rel="import" href="packages/polymer/polymer.html"> to your'
         ' <head> before any Dart scripts. Alternatively you can get a different'
         ' version of polymer.js by following the instructions at'
         ' http://www.polymer-project.org; if you do that be sure to include'
         ' the platform polyfills.');
   }

   // TODO(jmesserly): dart:js appears to not callback in the correct zone:
   // https://code.google.com/p/dart/issues/detail?id=17301
   var zone = Zone.current;

   polymerJs.callMethod('whenPolymerReady',
       [zone.bindCallback(() => Polymer._ready.complete())]);

   var polyElem = document.createElement('polymer-element');
   var proto = new JsObject.fromBrowserObject(polyElem)['__proto__'];
   if (proto is Node) proto = new JsObject.fromBrowserObject(proto);

   JsFunction originalRegister = proto['register'];
   if (originalRegister == null) {
     throw new StateError('polymer.js must expose "register" function on '
         'polymer-element to enable polymer.dart to interoperate.');
   }

   registerDart(jsElem, String name, String extendee) {
     // By the time we get here, we'll know for sure if it is a Dart object
     // or not, because polymer-element will wait for us to notify that
     // the @CustomTag was found.
     final type = _getRegisteredType(name);
     if (type != null) {
       final extendsDecl = _getDeclaration(extendee);
       return zone.run(() =>
           new PolymerDeclaration(jsElem, name, type, extendsDecl).register());
     }
     // It's a JavaScript polymer element, fall back to the original register.
     return originalRegister.apply([name, extendee], thisArg: jsElem);
   }

   proto['register'] = new JsFunction.withThis(registerDart);
 }
	// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	part of polymer;

	/// Annotation used to automatically register polymer elements.
	class CustomTag {
	final String tagName;
	const CustomTag(this.tagName);
	}

	/// Metadata used to label static or top-level methods that are called
	/// automatically when loading the library of a custom element.
	const initMethod = const InitMethodAnnotation();

	/// Implementation behind [initMethod]. Only exposed for internal implementation
	/// details
	class InitMethodAnnotation {
	const InitMethodAnnotation();
	}

	/// This method is deprecated. It used to be where polymer initialization
	/// happens, now this is done automatically from bootstrap.dart.
	@deprecated
	Zone initPolymer() {
	window.console.error(_ERROR);
	return Zone.current;
	}

	const _ERROR = '''
	initPolymer is now deprecated. To initialize a polymer app:
	* add to your page: <link rel="import" href="packages/polymer/polymer.html">
	* replace "application/dart" mime-types with "application/dart;component=1"
	* if you use "init.dart", remove it
	* if you have a main, change it into a method annotated with @initMethod
	''';

	/// True if we're in deployment mode.
	bool _deployMode = false;

	/// Starts polymer by running all [initializers] and hooking the polymer.js
	/// code. Note: this function is not meant to be invoked directly by
	/// application developers. It is invoked by a bootstrap entry point that is
	/// automatically generated. During development, this entry point is generated
	/// dynamically in `boot.js`. Similarly, pub-build generates this entry point
	/// for deployment.
	void startPolymer(List<Function> initializers, [bool deployMode = true]) {
	_hookJsPolymer();
	_deployMode = deployMode;

	for (var initializer in initializers) {
	initializer();
	}
	}

	/// To ensure Dart can interoperate with polymer-element registered by
	/// polymer.js, we need to be able to execute Dart code if we are registering
	/// a Dart class for that element. We trigger Dart logic by patching
	/// polymer-element's register function and:
	///
	/// * if it has a Dart class, run PolymerDeclaration's register.
	/// * otherwise it is a JS prototype, run polymer-element's normal register.
	void _hookJsPolymer() {
	var polymerJs = js.context['Polymer'];
	if (polymerJs == null) {
	throw new StateError('polymer.js must be loaded before polymer.dart, please'
	' add <link rel="import" href="packages/polymer/polymer.html"> to your'
	' <head> before any Dart scripts. Alternatively you can get a different'
	' version of polymer.js by following the instructions at'
	' http://www.polymer-project.org; if you do that be sure to include'
	' the platform polyfills.');
	}

	// TODO(jmesserly): dart:js appears to not callback in the correct zone:
	// https://code.google.com/p/dart/issues/detail?id=17301
	var zone = Zone.current;

	polymerJs.callMethod('whenPolymerReady',
	[zone.bindCallback(() => Polymer._ready.complete())]);

	var polyElem = document.createElement('polymer-element');
	var proto = new JsObject.fromBrowserObject(polyElem)['__proto__'];
	if (proto is Node) proto = new JsObject.fromBrowserObject(proto);

	JsFunction originalRegister = proto['register'];
	if (originalRegister == null) {
	throw new StateError('polymer.js must expose "register" function on '
	'polymer-element to enable polymer.dart to interoperate.');
	}

	registerDart(jsElem, String name, String extendee) {
	// By the time we get here, we'll know for sure if it is a Dart object
	// or not, because polymer-element will wait for us to notify that
	// the @CustomTag was found.
	final type = _getRegisteredType(name);
	if (type != null) {
	final extendsDecl = _getDeclaration(extendee);
	return zone.run(() =>
	new PolymerDeclaration(jsElem, name, type, extendsDecl).register());
	}
	// It's a JavaScript polymer element, fall back to the original register.
	return originalRegister.apply([name, extendee], thisArg: jsElem);
	}

	proto['register'] = new JsFunction.withThis(registerDart);
	}