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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const { fetchProperties } = require("./actions/grips");
+const { Property } = require("./reducers/grips");
+
+// Implementation
+function GripProvider(grips, dispatch) {
+ this.grips = grips;
+ this.dispatch = dispatch;
+}
+
+/**
+ * This object provides data for the tree displayed in the tooltip
+ * content.
+ */
+GripProvider.prototype = {
+ /**
+ * Fetches properties from the backend. These properties might be
+ * displayed as child objects in e.g. a tree UI widget.
+ */
+ getChildren: function (object) {
+ let grip = object;
+ if (object instanceof Property) {
+ grip = this.getValue(object);
+ }
+
+ if (!grip || !grip.actor) {
+ return [];
+ }
+
+ let props = this.grips.get(grip.actor);
+ if (!props) {
+ // Fetch missing data from the backend. Returning a promise
+ // from data provider causes the tree to show a spinner.
+ return this.dispatch(fetchProperties(grip));
+ }
+
+ return props;
+ },
+
+ hasChildren: function (object) {
+ if (object instanceof Property) {
+ let value = this.getValue(object);
+ if (!value) {
+ return false;
+ }
+
+ let hasChildren = value.ownPropertyLength > 0;
+
+ if (value.preview) {
+ hasChildren = hasChildren || value.preview.ownPropertiesLength > 0;
+ }
+
+ if (value.preview) {
+ let preview = value.preview;
+ let k = preview.kind;
+ let objectsWithProps = ["DOMNode", "ObjectWithURL"];
+ hasChildren = hasChildren || (objectsWithProps.indexOf(k) != -1);
+ hasChildren = hasChildren || (k == "ArrayLike" && preview.length > 0);
+ }
+
+ return (value.type == "object" && hasChildren);
+ }
+
+ return null;
+ },
+
+ getValue: function (object) {
+ if (object instanceof Property) {
+ let value = object.value;
+ return (typeof value.value != "undefined") ? value.value :
+ value.getterValue;
+ }
+
+ return object;
+ },
+
+ getLabel: function (object) {
+ return (object instanceof Property) ? object.name : null;
+ },
+
+ getKey: function (object) {
+ return (object instanceof Property) ? object.key : null;
+ },
+
+ getType: function (object) {
+ return object.class ? object.class : "";
+ },
+};
+
+// Exports from this module
+exports.GripProvider = GripProvider;