[Plugins] Bring over timeline, clock plugins

WTD-1239

platform/features/timeline/src/controllers/swimlane/TimelineProxy.js

@@ -0,0 +1,58 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        /**
+         * Selection proxy for the Timeline view. Implements
+         * behavior associated with the Add button in the
+         * timeline's toolbar.
+         * @constructor
+         */
+        function TimelineProxy(domainObject, selection) {
+            var actionMap = {};
+
+            // Populate available Create actions for this domain object
+            function populateActionMap(domainObject) {
+                var actionCapability = domainObject.getCapability('action'),
+                    actions = actionCapability ?
+                            actionCapability.getActions('create') : [];
+                actions.forEach(function (action) {
+                    actionMap[action.getMetadata().type] = action;
+                });
+            }
+
+            // Populate available actions based on current selection
+            // (defaulting to object-in-view if there is none.)
+            function populateForSelection() {
+                var swimlane = selection && selection.get(),
+                    selectedObject = swimlane && swimlane.domainObject;
+                populateActionMap(selectedObject || domainObject);
+            }
+
+            populateActionMap(domainObject);
+
+            return {
+                /**
+                 * Add a domain object of the specified type.
+                 * @param {string} type the type of domain object to add
+                 */
+                add: function (type) {
+                    // Update list of create actions; this needs to reflect
+                    // the current selection so that Save in defaults
+                    // appropriately.
+                    populateForSelection();
+
+                    // Create an object of that type
+                    if (actionMap[type]) {
+                        return actionMap[type].perform();
+                    }
+                }
+            };
+        }
+
+        return TimelineProxy;
+    }
+);