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//----------------------------------------------------------------------------
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// Copyright (C) 2013 The IPython Development Team
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//
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// Distributed under the terms of the BSD License. The full license is in
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// the file COPYING, distributed as part of this software.
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//----------------------------------------------------------------------------
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//============================================================================
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// WidgetModel, WidgetView, and WidgetManager
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//============================================================================
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/**
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* Base Widget classes
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* @module IPython
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* @namespace IPython
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* @submodule widget
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*/
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(function () {
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"use strict";
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// Use require.js 'define' method so that require.js is intelligent enough to
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// syncronously load everything within this file when it is being 'required'
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// elsewhere.
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define(["underscore",
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"backbone",
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], function (_, Backbone) {
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//--------------------------------------------------------------------
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// WidgetManager class
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//--------------------------------------------------------------------
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var WidgetManager = function (comm_manager) {
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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.comm_manager = comm_manager;
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this._models = {}; /* Dictionary of model ids and model instances */
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// Register already-registered widget model types with the comm manager.
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var that = this;
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_.each(WidgetManager._model_types, function(model_type, model_name) {
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that.comm_manager.register_target(model_name, $.proxy(that._handle_comm_open, that));
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});
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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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// Register the widget with the comm manager. Make sure to pass this object's context
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// in so `this` works in the call back.
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_.each(WidgetManager._managers, function(instance, i) {
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if (instance.comm_manager !== null) {
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instance.comm_manager.register_target(model_name, $.proxy(instance._handle_comm_open, instance));
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}
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});
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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 cell = this.get_msg_cell(msg.parent_header.msg_id);
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if (cell === null) {
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console.log("Could not determine where the display" +
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" message was from. Widget will not be displayed");
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} else {
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var view = this.create_view(model, {cell: cell});
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if (view === null) {
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console.error("View creation failed", model);
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}
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if (cell.widget_subarea) {
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cell.widget_area.show();
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this._handle_display_view(view);
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cell.widget_subarea.append(view.$el);
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}
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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 (view.elements) {
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for (var i = 0; i < view.elements.length; i++) {
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IPython.keyboard_manager.register_events(view.elements[i]);
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}
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} else {
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IPython.keyboard_manager.register_events(view.$el);
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}
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};
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WidgetManager.prototype.create_view = function(model, options, view) {
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// Creates a view for a particular model.
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var view_name = model.get('_view_name');
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var ViewType = WidgetManager._view_types[view_name];
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if (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 (view !== undefined) {
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options.cell = view.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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view = new ViewType(parameters);
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view.render();
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model.views.push(view);
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model.on('destroy', view.remove, view);
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return view;
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}
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return null;
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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 (IPython.notebook) {
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cell = IPython.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 dict 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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// Look-up a model instance by its id.
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var model = this._models[model_id];
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if (model !== undefined && model.id == model_id) {
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return model;
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}
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return null;
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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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var model_id = comm.comm_id;
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var widget_type_name = msg.content.target_name;
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var widget_model = new WidgetManager._model_types[widget_type_name](this, model_id, comm);
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this._models[model_id] = widget_model;
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};
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IPython.WidgetManager = WidgetManager;
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return IPython.WidgetManager;
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});
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}());
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