.

node_modules/@mixmark-io/domino/EventTarget.js

@@ -0,0 +1,298 @@
+"use strict";
+var Event = require('./Event');
+var MouseEvent = require('./MouseEvent');
+var utils = require('./utils');
+
+module.exports = EventTarget;
+
+function EventTarget() {}
+
+EventTarget.prototype = {
+  // XXX
+  // See WebIDL §4.8 for details on object event handlers
+  // and how they should behave.  We actually have to accept
+  // any object to addEventListener... Can't type check it.
+  // on registration.
+
+  // XXX:
+  // Capturing event listeners are sort of rare.  I think I can optimize
+  // them so that dispatchEvent can skip the capturing phase (or much of
+  // it).  Each time a capturing listener is added, increment a flag on
+  // the target node and each of its ancestors.  Decrement when removed.
+  // And update the counter when nodes are added and removed from the
+  // tree as well.  Then, in dispatch event, the capturing phase can
+  // abort if it sees any node with a zero count.
+  addEventListener: function addEventListener(type, listener, capture) {
+    if (!listener) return;
+    if (capture === undefined) capture = false;
+    if (!this._listeners) this._listeners = Object.create(null);
+    if (!this._listeners[type]) this._listeners[type] = [];
+    var list = this._listeners[type];
+
+    // If this listener has already been registered, just return
+    for(var i = 0, n = list.length; i < n; i++) {
+      var l = list[i];
+      if (l.listener === listener && l.capture === capture)
+        return;
+    }
+
+    // Add an object to the list of listeners
+    var obj = { listener: listener, capture: capture };
+    if (typeof listener === 'function') obj.f = listener;
+    list.push(obj);
+  },
+
+  removeEventListener: function removeEventListener(type,
+                            listener,
+                            capture) {
+    if (capture === undefined) capture = false;
+    if (this._listeners) {
+      var list = this._listeners[type];
+      if (list) {
+        // Find the listener in the list and remove it
+        for(var i = 0, n = list.length; i < n; i++) {
+          var l = list[i];
+          if (l.listener === listener && l.capture === capture) {
+            if (list.length === 1) {
+              this._listeners[type] = undefined;
+            }
+            else {
+              list.splice(i, 1);
+            }
+            return;
+          }
+        }
+      }
+    }
+  },
+
+  // This is the public API for dispatching untrusted public events.
+  // See _dispatchEvent for the implementation
+  dispatchEvent: function dispatchEvent(event) {
+    // Dispatch an untrusted event
+    return this._dispatchEvent(event, false);
+  },
+
+  //
+  // See DOMCore §4.4
+  // XXX: I'll probably need another version of this method for
+  // internal use, one that does not set isTrusted to false.
+  // XXX: see Document._dispatchEvent: perhaps that and this could
+  // call a common internal function with different settings of
+  // a trusted boolean argument
+  //
+  // XXX:
+  // The spec has changed in how to deal with handlers registered
+  // on idl or content attributes rather than with addEventListener.
+  // Used to say that they always ran first.  That's how webkit does it
+  // Spec now says that they run in a position determined by
+  // when they were first set.  FF does it that way.  See:
+  // http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#event-handlers
+  //
+  _dispatchEvent: function _dispatchEvent(event, trusted) {
+    if (typeof trusted !== 'boolean') trusted = false;
+    function invoke(target, event) {
+      var type = event.type, phase = event.eventPhase;
+      event.currentTarget = target;
+
+      // If there was an individual handler defined, invoke it first
+      // XXX: see comment above: this shouldn't always be first.
+      if (phase !== Event.CAPTURING_PHASE &&
+        target._handlers && target._handlers[type])
+      {
+        var handler = target._handlers[type];
+        var rv;
+        if (typeof handler === 'function') {
+          rv=handler.call(event.currentTarget, event);
+        }
+        else {
+          var f = handler.handleEvent;
+          if (typeof f !== 'function')
+            throw new TypeError('handleEvent property of ' +
+                                'event handler object is' +
+                                'not a function.');
+          rv=f.call(handler, event);
+        }
+
+        switch(event.type) {
+        case 'mouseover':
+          if (rv === true)  // Historical baggage
+            event.preventDefault();
+          break;
+        case 'beforeunload':
+          // XXX: eventually we need a special case here
+          /* falls through */
+        default:
+          if (rv === false)
+            event.preventDefault();
+          break;
+        }
+      }
+
+      // Now invoke list list of listeners for this target and type
+      var list = target._listeners && target._listeners[type];
+      if (!list) return;
+      list = list.slice();
+      for(var i = 0, n = list.length; i < n; i++) {
+        if (event._immediatePropagationStopped) return;
+        var l = list[i];
+        if ((phase === Event.CAPTURING_PHASE && !l.capture) ||
+          (phase === Event.BUBBLING_PHASE && l.capture))
+          continue;
+        if (l.f) {
+          l.f.call(event.currentTarget, event);
+        }
+        else {
+          var fn = l.listener.handleEvent;
+          if (typeof fn !== 'function')
+            throw new TypeError('handleEvent property of event listener object is not a function.');
+          fn.call(l.listener, event);
+        }
+      }
+    }
+
+    if (!event._initialized || event._dispatching) utils.InvalidStateError();
+    event.isTrusted = trusted;
+
+    // Begin dispatching the event now
+    event._dispatching = true;
+    event.target = this;
+
+    // Build the list of targets for the capturing and bubbling phases
+    // XXX: we'll eventually have to add Window to this list.
+    var ancestors = [];
+    for(var n = this.parentNode; n; n = n.parentNode)
+      ancestors.push(n);
+
+    // Capturing phase
+    event.eventPhase = Event.CAPTURING_PHASE;
+    for(var i = ancestors.length-1; i >= 0; i--) {
+      invoke(ancestors[i], event);
+      if (event._propagationStopped) break;
+    }
+
+    // At target phase
+    if (!event._propagationStopped) {
+      event.eventPhase = Event.AT_TARGET;
+      invoke(this, event);
+    }
+
+    // Bubbling phase
+    if (event.bubbles && !event._propagationStopped) {
+      event.eventPhase = Event.BUBBLING_PHASE;
+      for(var ii = 0, nn = ancestors.length; ii < nn; ii++) {
+        invoke(ancestors[ii], event);
+        if (event._propagationStopped) break;
+      }
+    }
+
+    event._dispatching = false;
+    event.eventPhase = Event.AT_TARGET;
+    event.currentTarget = null;
+
+    // Deal with mouse events and figure out when
+    // a click has happened
+    if (trusted && !event.defaultPrevented && event instanceof MouseEvent) {
+      switch(event.type) {
+      case 'mousedown':
+        this._armed = {
+          x: event.clientX,
+          y: event.clientY,
+          t: event.timeStamp
+        };
+        break;
+      case 'mouseout':
+      case 'mouseover':
+        this._armed = null;
+        break;
+      case 'mouseup':
+        if (this._isClick(event)) this._doClick(event);
+        this._armed = null;
+        break;
+      }
+    }
+
+
+
+    return !event.defaultPrevented;
+  },
+
+  // Determine whether a click occurred
+  // XXX We don't support double clicks for now
+  _isClick: function(event) {
+    return (this._armed !== null &&
+        event.type === 'mouseup' &&
+        event.isTrusted &&
+        event.button === 0 &&
+        event.timeStamp - this._armed.t < 1000 &&
+        Math.abs(event.clientX - this._armed.x) < 10 &&
+        Math.abs(event.clientY - this._armed.Y) < 10);
+  },
+
+  // Clicks are handled like this:
+  // http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#interactive-content-0
+  //
+  // Note that this method is similar to the HTMLElement.click() method
+  // The event argument must be the trusted mouseup event
+  _doClick: function(event) {
+    if (this._click_in_progress) return;
+    this._click_in_progress = true;
+
+    // Find the nearest enclosing element that is activatable
+    // An element is activatable if it has a
+    // _post_click_activation_steps hook
+    var activated = this;
+    while(activated && !activated._post_click_activation_steps)
+      activated = activated.parentNode;
+
+    if (activated && activated._pre_click_activation_steps) {
+      activated._pre_click_activation_steps();
+    }
+
+    var click = this.ownerDocument.createEvent('MouseEvent');
+    click.initMouseEvent('click', true, true,
+      this.ownerDocument.defaultView, 1,
+      event.screenX, event.screenY,
+      event.clientX, event.clientY,
+      event.ctrlKey, event.altKey,
+      event.shiftKey, event.metaKey,
+      event.button, null);
+
+    var result = this._dispatchEvent(click, true);
+
+    if (activated) {
+      if (result) {
+        // This is where hyperlinks get followed, for example.
+        if (activated._post_click_activation_steps)
+          activated._post_click_activation_steps(click);
+      }
+      else {
+        if (activated._cancelled_activation_steps)
+          activated._cancelled_activation_steps();
+      }
+    }
+  },
+
+  //
+  // An event handler is like an event listener, but it registered
+  // by setting an IDL or content attribute like onload or onclick.
+  // There can only be one of these at a time for any event type.
+  // This is an internal method for the attribute accessors and
+  // content attribute handlers that need to register events handlers.
+  // The type argument is the same as in addEventListener().
+  // The handler argument is the same as listeners in addEventListener:
+  // it can be a function or an object. Pass null to remove any existing
+  // handler.  Handlers are always invoked before any listeners of
+  // the same type.  They are not invoked during the capturing phase
+  // of event dispatch.
+  //
+  _setEventHandler: function _setEventHandler(type, handler) {
+    if (!this._handlers) this._handlers = Object.create(null);
+    this._handlers[type] = handler;
+  },
+
+  _getEventHandler: function _getEventHandler(type) {
+    return (this._handlers && this._handlers[type]) || null;
+  }
+
+};