Delete polymer from the Dart repo

pkg/polymer/lib/src/events.dart

-// 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.
-
-/// Code from declaration/events.js
-part of polymer;
-
-/// An extension of [polymer_expressions.PolymerExpressions] that adds support
-/// for binding events using `on-eventName` using [PolymerEventBindings].
-// TODO(jmesserly): the JS layering is a bit odd, with polymer-dev implementing
-// events and polymer-expressions implementing everything else. I don't think
-// this separation is right in the long term, so we're using the same class name
-// until we can sort it out.
-class PolymerExpressions extends BindingDelegate with PolymerEventBindings {
-
-  /// A wrapper around polymer_expressions used to implement forwarding.
-  /// Ideally we would inherit from it, but mixins can't be applied to a type
-  /// that forwards to a superclass with a constructor that has optional or
-  /// named arguments.
-  final polymer_expressions.PolymerExpressions _delegate;
-
-  Map<String, Object> get globals => _delegate.globals;
-
-  PolymerExpressions({Map<String, Object> globals})
-      : _delegate = new polymer_expressions.PolymerExpressions(
-          globals: globals);
-
-  prepareBinding(String path, name, node) {
-    if (_hasEventPrefix(name)) {
-      return prepareEventBinding(path, name, node);
-    }
-    return _delegate.prepareBinding(path, name, node);
-  }
-
-  prepareInstanceModel(Element template) =>
-      _delegate.prepareInstanceModel(template);
-
-  prepareInstancePositionChanged(Element template) =>
-      _delegate.prepareInstancePositionChanged(template);
-
-  static final getExpression =
-      polymer_expressions.PolymerExpressions.getExpression;
-  static final getBinding = polymer_expressions.PolymerExpressions.getBinding;
-
-}
-
-/// A mixin for a [BindingDelegate] to add Polymer event support.
-/// This is included in [PolymerExpressions].
-abstract class PolymerEventBindings {
-  /// Finds the event controller for this node.
-  Element findController(Node node) {
-    while (node.parentNode != null) {
-      if (node is Polymer && node.eventController != null) {
-        return node.eventController;
-      } else if (node is Element) {
-        // If it is a normal element, js polymer element, or dart wrapper to a
-        // js polymer element, then we try js interop.
-        var eventController =
-            new JsObject.fromBrowserObject(node)['eventController'];
-        if (eventController != null) return eventController;
-      }
-      node = node.parentNode;
-    }
-    return node is ShadowRoot ? node.host : null;
-  }
-
-  EventListener getEventHandler(controller, target, String method) => (e) {
-    if (controller == null || controller is! Polymer) {
-      controller = findController(target);
-    }
-
-    if (controller is Polymer) {
-      var detail = null;
-      if (e is CustomEvent) {
-        detail = e.detail;
-        // TODO(sigmund): this shouldn't be necessary. See issue 19315.
-        if (detail == null) {
-          detail = new JsObject.fromBrowserObject(e)['detail'];
-        }
-      }
-      var args = [e, detail, e.currentTarget];
-      controller.dispatchMethod(controller, method, args);
-    } else {
-      throw new StateError('controller $controller is not a '
-          'Dart polymer-element.');
-    }
-  };
-
-  prepareEventBinding(String path, String name, Node node) {
-    if (!_hasEventPrefix(name)) return null;
-
-    var eventType = _removeEventPrefix(name);
-    var translated = _eventTranslations[eventType];
-    eventType = translated != null ? translated : eventType;
-
-    return (model, node, oneTime) {
-      var eventHandler =
-          Zone.current.bindUnaryCallback(getEventHandler(null, node, path));
-      // TODO(jakemac): Remove this indirection if/when JsFunction gets a
-      // simpler constructor that doesn't pass this, http://dartbug.com/20545.
-      var handler = new JsFunction.withThis((_, e) => eventHandler(e));
-      _PolymerGestures.callMethod(
-          'addEventListener', [node, eventType, handler]);
-
-      if (oneTime) return null;
-      return new _EventBindable(path, node, eventType, handler);
-    };
-  }
-}
-
-
-class _EventBindable extends Bindable {
-  final String _path;
-  final Node _node;
-  final String _eventType;
-  final JsFunction _handler;
-
-  _EventBindable(this._path, this._node, this._eventType, this._handler);
-
-  // TODO(rafaelw): This is really pointless work. Aside from the cost
-  // of these allocations, NodeBind is going to setAttribute back to its
-  // current value. Fixing this would mean changing the TemplateBinding
-  // binding delegate API.
-  get value => '{{ $_path }}';
-
-  open(callback) => value;
-
-  void close() {
-    _PolymerGestures.callMethod(
-        'removeEventListener', [_node, _eventType, _handler]);
-  }
-}
-
-
-/// Attribute prefix used for declarative event handlers.
-const _EVENT_PREFIX = 'on-';
-
-/// Whether an attribute declares an event.
-bool _hasEventPrefix(String attr) => attr.startsWith(_EVENT_PREFIX);
-
-String _removeEventPrefix(String name) => name.substring(_EVENT_PREFIX.length);
-
-// Dart note: polymer.js calls this mixedCaseEventTypes. But we have additional
-// things that need translation due to renames.
-final _eventTranslations = const {
-  'domfocusout': 'DOMFocusOut',
-  'domfocusin': 'DOMFocusIn',
-  'dommousescroll': 'DOMMouseScroll',
-
-  // Dart note: handle Dart-specific event names.
-  'animationend': 'webkitAnimationEnd',
-  'animationiteration': 'webkitAnimationIteration',
-  'animationstart': 'webkitAnimationStart',
-  'doubleclick': 'dblclick',
-  'fullscreenchange': 'webkitfullscreenchange',
-  'fullscreenerror': 'webkitfullscreenerror',
-  'keyadded': 'webkitkeyadded',
-  'keyerror': 'webkitkeyerror',
-  'keymessage': 'webkitkeymessage',
-  'needkey': 'webkitneedkey',
-  'speechchange': 'webkitSpeechChange',
-};
-
-final _reverseEventTranslations = () {
-  final map = new Map<String, String>();
-  _eventTranslations.forEach((onName, eventType) {
-    map[eventType] = onName;
-  });
-  return map;
-}();
-
-// Dart note: we need this function because we have additional renames JS does
-// not have. The JS renames are simply case differences, whereas we have ones
-// like doubleclick -> dblclick and stripping the webkit prefix.
-String _eventNameFromType(String eventType) {
-  final result = _reverseEventTranslations[eventType];
-  return result != null ? result : eventType;
-}