1 files changed, 235 insertions, 0 deletions
diff --git a/Source/WebInspectorUI/UserInterface/Object.js b/Source/WebInspectorUI/UserInterface/Object.js
new file mode 100644
index 000000000..a68da9663
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Object.js
@@ -0,0 +1,235 @@
+/*
+ * Copyright (C) 2008, 2013 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @constructor
+ */
+WebInspector.Object = function() {
+}
+
+/**
+ * @param {function} constructor
+ */
+WebInspector.Object.addConstructorFunctions = function(subclassConstructor)
+{
+    // Copies the relevant functions the subclass constructor.
+    for (var property in WebInspector.Object) {
+        var value = WebInspector.Object[property];
+        if (typeof value !== "function")
+            continue;
+        if (value === arguments.callee)
+            continue;
+        subclassConstructor[property] = value;
+    }
+}
+
+/**
+ * @param {string} eventType
+ * @param {function(WebInspector.Event)} listener
+ * @param {Object=} thisObject
+ */
+WebInspector.Object.addEventListener = function(eventType, listener, thisObject)
+{
+    thisObject = thisObject || null;
+
+    console.assert(eventType);
+    if (!eventType)
+        return;
+
+    console.assert(listener);
+    if (!listener)
+        return;
+
+    if (!this._listeners)
+        this._listeners = {};
+
+    var listeners = this._listeners[eventType];
+    if (!listeners)
+        listeners = this._listeners[eventType] = [];
+
+    // Prevent registering multiple times.
+    for (var i = 0; i < listeners.length; ++i) {
+        if (listeners[i].listener === listener && listeners[i].thisObject === thisObject)
+            return;
+    }
+
+    listeners.push({thisObject: thisObject, listener: listener});
+};
+
+/**
+ * @param {string} eventType
+ * @param {function(WebInspector.Event)} listener
+ * @param {Object=} thisObject
+ */
+WebInspector.Object.removeEventListener = function(eventType, listener, thisObject)
+{
+    eventType = eventType || null;
+    listener = listener || null;
+    thisObject = thisObject || null;
+
+    if (!this._listeners)
+        return;
+
+    if (!eventType) {
+        for (eventType in this._listeners)
+            this.removeEventListener(eventType, listener, thisObject);
+        return;
+    }
+
+    var listeners = this._listeners[eventType];
+    if (!listeners)
+        return;
+
+    for (var i = listeners.length - 1; i >= 0; --i) {
+        if (listener && listeners[i].listener === listener && listeners[i].thisObject === thisObject)
+            listeners.splice(i, 1);
+        else if (!listener && thisObject && listeners[i].thisObject === thisObject)
+            listeners.splice(i, 1);
+    }
+
+    if (!listeners.length)
+        delete this._listeners[eventType];
+
+    if (!Object.keys(this._listeners).length)
+        delete this._listeners;
+};
+
+WebInspector.Object.removeAllListeners = function()
+{
+    delete this._listeners;
+};
+
+/**
+ * @param {string} eventType
+ * @return {boolean}
+ */
+WebInspector.Object.hasEventListeners = function(eventType)
+{
+    if (!this._listeners || !this._listeners[eventType])
+        return false;
+    return true;
+};
+
+WebInspector.Object.prototype = {
+    constructor: WebInspector.Object,
+
+    /**
+     * @param {string} eventType
+     * @param {function(WebInspector.Event)} listener
+     * @param {Object=} thisObject
+     */
+    addEventListener: WebInspector.Object.addEventListener,
+
+    /**
+     * @param {string} eventType
+     * @param {function(WebInspector.Event)} listener
+     * @param {Object=} thisObject
+     */
+    removeEventListener: WebInspector.Object.removeEventListener,
+
+    removeAllListeners: WebInspector.Object.removeAllListeners,
+
+    /**
+     * @param {string} eventType
+     * @return {boolean}
+     */
+    hasEventListeners: WebInspector.Object.hasEventListeners,
+
+    /**
+     * @param {string} eventType
+     * @param {*=} eventData
+     * @return {boolean}
+     */
+    dispatchEventToListeners: function(eventType, eventData)
+    {
+        var event = new WebInspector.Event(this, eventType, eventData);
+
+        function dispatch(object)
+        {
+            if (!object || !object._listeners || !object._listeners[eventType] || event._stoppedPropagation)
+                return;
+
+            // Make a copy with slice so mutations during the loop doesn't affect us.
+            var listenersForThisEvent = object._listeners[eventType].slice(0);
+
+            // Iterate over the listeners and call them. Stop if stopPropagation is called.
+            for (var i = 0; i < listenersForThisEvent.length; ++i) {
+                listenersForThisEvent[i].listener.call(listenersForThisEvent[i].thisObject, event);
+                if (event._stoppedPropagation)
+                    break;
+            }
+        }
+
+        // Dispatch to listeners of this specific object.
+        dispatch(this);
+
+        // Allow propagation again so listeners on the constructor always have a crack at the event.
+        event._stoppedPropagation = false;
+
+        // Dispatch to listeners on all constructors up the prototype chain, including the immediate constructor.
+        var constructor = this.constructor;
+        while (constructor) {
+            dispatch(constructor);
+
+            if (!constructor.prototype.__proto__)
+                break;
+
+            constructor = constructor.prototype.__proto__.constructor;
+        }
+
+        return event.defaultPrevented;
+    }
+}
+
+/**
+ * @constructor
+ * @param {WebInspector.Object} target
+ * @param {string} type
+ * @param {*=} data
+ */
+WebInspector.Event = function(target, type, data)
+{
+    this.target = target;
+    this.type = type;
+    this.data = data;
+    this.defaultPrevented = false;
+    this._stoppedPropagation = false;
+}
+
+WebInspector.Event.prototype = {
+    constructor: WebInspector.Event,
+
+    stopPropagation: function()
+    {
+        this._stoppedPropagation = true;
+    },
+
+    preventDefault: function()
+    {
+        this.defaultPrevented = true;
+    }
+}
+
+WebInspector.notifications = new WebInspector.Object;