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// Copyright (c) IPython Development Team.
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// Distributed under the terms of the Modified BSD License.
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define([
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"underscore",
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"backbone",
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"jquery",
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"base/js/utils",
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"base/js/namespace",
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], function (_, Backbone, $, utils, IPython) {
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"use strict";
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//--------------------------------------------------------------------
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// WidgetManager class
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//--------------------------------------------------------------------
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var WidgetManager = function (comm_manager, notebook) {
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// Public constructor
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WidgetManager._managers.push(this);
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// Attach a comm manager to the
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this.keyboard_manager = notebook.keyboard_manager;
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this.notebook = notebook;
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this.comm_manager = comm_manager;
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this._models = {}; /* Dictionary of model ids and model instances */
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// Register with the comm manager.
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this.comm_manager.register_target('ipython.widget', $.proxy(this._handle_comm_open, this));
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};
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//--------------------------------------------------------------------
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// Class level
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//--------------------------------------------------------------------
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WidgetManager._model_types = {}; /* Dictionary of model type names (target_name) and model types. */
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WidgetManager._view_types = {}; /* Dictionary of view names and view types. */
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WidgetManager._managers = []; /* List of widget managers */
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WidgetManager.register_widget_model = function (model_name, model_type) {
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// Registers a widget model by name.
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WidgetManager._model_types[model_name] = model_type;
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};
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WidgetManager.register_widget_view = function (view_name, view_type) {
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// Registers a widget view by name.
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WidgetManager._view_types[view_name] = view_type;
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};
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//--------------------------------------------------------------------
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// Instance level
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//--------------------------------------------------------------------
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WidgetManager.prototype.display_view = function(msg, model) {
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// Displays a view for a particular model.
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var that = this;
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var cell = this.get_msg_cell(msg.parent_header.msg_id);
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if (cell === null) {
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return Promise.reject(new Error("Could not determine where the display" +
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" message was from. Widget will not be displayed"));
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} else if (cell.widget_subarea) {
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var dummy = $('<div />');
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cell.widget_subarea.append(dummy);
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return this.create_view(model, {cell: cell}).then(
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function(view) {
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that._handle_display_view(view);
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dummy.replaceWith(view.$el);
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view.trigger('displayed');
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return view;
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}).catch(utils.reject('Could not display view', true));
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}
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};
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WidgetManager.prototype._handle_display_view = function (view) {
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// Have the IPython keyboard manager disable its event
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// handling so the widget can capture keyboard input.
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// Note, this is only done on the outer most widgets.
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if (this.keyboard_manager) {
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this.keyboard_manager.register_events(view.$el);
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if (view.additional_elements) {
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for (var i = 0; i < view.additional_elements.length; i++) {
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this.keyboard_manager.register_events(view.additional_elements[i]);
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}
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}
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}
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};
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WidgetManager.prototype.create_view = function(model, options) {
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// Creates a promise for a view of a given model
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// Make sure the view creation is not out of order with
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// any state updates.
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model.state_change = model.state_change.then(function() {
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return utils.load_class(model.get('_view_name'), model.get('_view_module'),
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WidgetManager._view_types).then(function(ViewType) {
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// If a view is passed into the method, use that view's cell as
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// the cell for the view that is created.
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options = options || {};
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if (options.parent !== undefined) {
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options.cell = options.parent.options.cell;
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}
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// Create and render the view...
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var parameters = {model: model, options: options};
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var view = new ViewType(parameters);
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view.listenTo(model, 'destroy', view.remove);
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view.render();
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return view;
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}).catch(utils.reject("Couldn't create a view for model id '" + String(model.id) + "'", true));
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});
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return model.state_change;
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};
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WidgetManager.prototype.get_msg_cell = function (msg_id) {
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var cell = null;
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// First, check to see if the msg was triggered by cell execution.
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if (this.notebook) {
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cell = this.notebook.get_msg_cell(msg_id);
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}
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if (cell !== null) {
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return cell;
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}
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// Second, check to see if a get_cell callback was defined
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// for the message. get_cell callbacks are registered for
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// widget messages, so this block is actually checking to see if the
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// message was triggered by a widget.
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var kernel = this.comm_manager.kernel;
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if (kernel) {
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var callbacks = kernel.get_callbacks_for_msg(msg_id);
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if (callbacks && callbacks.iopub &&
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callbacks.iopub.get_cell !== undefined) {
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return callbacks.iopub.get_cell();
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}
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}
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// Not triggered by a cell or widget (no get_cell callback
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// exists).
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return null;
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};
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WidgetManager.prototype.callbacks = function (view) {
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// callback handlers specific a view
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var callbacks = {};
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if (view && view.options.cell) {
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// Try to get output handlers
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var cell = view.options.cell;
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var handle_output = null;
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var handle_clear_output = null;
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if (cell.output_area) {
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handle_output = $.proxy(cell.output_area.handle_output, cell.output_area);
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handle_clear_output = $.proxy(cell.output_area.handle_clear_output, cell.output_area);
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}
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// Create callback dictionary using what is known
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var that = this;
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callbacks = {
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iopub : {
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output : handle_output,
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clear_output : handle_clear_output,
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// Special function only registered by widget messages.
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// Allows us to get the cell for a message so we know
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// where to add widgets if the code requires it.
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get_cell : function () {
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return cell;
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},
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},
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};
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}
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return callbacks;
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};
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WidgetManager.prototype.get_model = function (model_id) {
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// Get a promise for a model by model id.
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return this._models[model_id];
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};
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WidgetManager.prototype._handle_comm_open = function (comm, msg) {
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// Handle when a comm is opened.
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return this.create_model({
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model_name: msg.content.data.model_name,
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model_module: msg.content.data.model_module,
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comm: comm}).catch(utils.reject("Couldn't create a model.", true));
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};
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WidgetManager.prototype.create_model = function (options) {
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// Create and return a promise for a new widget model
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//
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// Minimally, one must provide the model_name and widget_class
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// parameters to create a model from Javascript.
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//
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// Example
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// --------
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// JS:
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// IPython.notebook.kernel.widget_manager.create_model({
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// model_name: 'WidgetModel',
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// widget_class: 'IPython.html.widgets.widget_int.IntSlider'})
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// .then(function(model) { console.log('Create success!', model); },
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// $.proxy(console.error, console));
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//
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// Parameters
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// ----------
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// options: dictionary
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// Dictionary of options with the following contents:
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// model_name: string
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// Target name of the widget model to create.
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// model_module: (optional) string
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// Module name of the widget model to create.
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// widget_class: (optional) string
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// Target name of the widget in the back-end.
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// comm: (optional) Comm
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// Create a comm if it wasn't provided.
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var comm = options.comm;
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if (!comm) {
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comm = this.comm_manager.new_comm('ipython.widget', {'widget_class': options.widget_class});
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}
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var that = this;
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var model_id = comm.comm_id;
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var model_promise = utils.load_class(options.model_name, options.model_module, WidgetManager._model_types)
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.then(function(ModelType) {
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var widget_model = new ModelType(that, model_id, comm);
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widget_model.once('comm:close', function () {
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delete that._models[model_id];
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});
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return widget_model;
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}, function(error) {
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delete that._models[model_id];
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var wrapped_error = new utils.WrappedError("Couldn't create model", error);
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return Promise.reject(wrapped_error);
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});
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this._models[model_id] = model_promise;
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return model_promise;
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};
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// Backwards compatibility.
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IPython.WidgetManager = WidgetManager;
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return {'WidgetManager': WidgetManager};
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});
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