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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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// Base Widget Model and View classes
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//============================================================================
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/**
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* @module IPython
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* @namespace IPython
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**/
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define(["widgets/js/manager",
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"underscore",
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"backbone"],
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function(WidgetManager, _, Backbone){
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var WidgetModel = Backbone.Model.extend({
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constructor: function (widget_manager, model_id, comm) {
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// Constructor
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//
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// Creates a WidgetModel instance.
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//
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// Parameters
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// ----------
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// widget_manager : WidgetManager instance
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// model_id : string
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// An ID unique to this model.
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// comm : Comm instance (optional)
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this.widget_manager = widget_manager;
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this._buffered_state_diff = {};
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this.pending_msgs = 0;
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this.msg_buffer = null;
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this.key_value_lock = null;
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this.id = model_id;
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this.views = [];
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if (comm !== undefined) {
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// Remember comm associated with the model.
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this.comm = comm;
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comm.model = this;
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// Hook comm messages up to model.
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comm.on_close($.proxy(this._handle_comm_closed, this));
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comm.on_msg($.proxy(this._handle_comm_msg, this));
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}
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return Backbone.Model.apply(this);
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},
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send: function (content, callbacks) {
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// Send a custom msg over the comm.
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if (this.comm !== undefined) {
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var data = {method: 'custom', content: content};
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this.comm.send(data, callbacks);
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this.pending_msgs++;
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}
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},
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_handle_comm_closed: function (msg) {
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// Handle when a widget is closed.
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this.trigger('comm:close');
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delete this.comm.model; // Delete ref so GC will collect widget model.
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delete this.comm;
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delete this.model_id; // Delete id from model so widget manager cleans up.
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_.each(this.views, function(view, i) {
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view.remove();
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});
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},
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_handle_comm_msg: function (msg) {
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// Handle incoming comm msg.
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var method = msg.content.data.method;
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switch (method) {
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case 'update':
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this.apply_update(msg.content.data.state);
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break;
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case 'custom':
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this.trigger('msg:custom', msg.content.data.content);
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break;
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case 'display':
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this.widget_manager.display_view(msg, this);
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break;
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}
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},
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apply_update: function (state) {
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// Handle when a widget is updated via the python side.
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var that = this;
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_.each(state, function(value, key) {
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that.key_value_lock = [key, value];
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try {
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WidgetModel.__super__.set.apply(that, [key, that._unpack_models(value)]);
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} finally {
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that.key_value_lock = null;
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}
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});
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},
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_handle_status: function (msg, callbacks) {
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// Handle status msgs.
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// execution_state : ('busy', 'idle', 'starting')
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if (this.comm !== undefined) {
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if (msg.content.execution_state ==='idle') {
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// Send buffer if this message caused another message to be
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// throttled.
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if (this.msg_buffer !== null &&
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(this.get('msg_throttle') || 3) === this.pending_msgs) {
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var data = {method: 'backbone', sync_method: 'update', sync_data: this.msg_buffer};
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this.comm.send(data, callbacks);
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this.msg_buffer = null;
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} else {
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--this.pending_msgs;
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}
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}
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}
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},
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callbacks: function(view) {
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// Create msg callbacks for a comm msg.
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var callbacks = this.widget_manager.callbacks(view);
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if (callbacks.iopub === undefined) {
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callbacks.iopub = {};
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}
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var that = this;
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callbacks.iopub.status = function (msg) {
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that._handle_status(msg, callbacks);
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};
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return callbacks;
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},
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set: function(key, val, options) {
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// Set a value.
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var return_value = WidgetModel.__super__.set.apply(this, arguments);
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// Backbone only remembers the diff of the most recent set()
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// operation. Calling set multiple times in a row results in a
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// loss of diff information. Here we keep our own running diff.
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this._buffered_state_diff = $.extend(this._buffered_state_diff, this.changedAttributes() || {});
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return return_value;
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},
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sync: function (method, model, options) {
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// Handle sync to the back-end. Called when a model.save() is called.
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// Make sure a comm exists.
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var error = options.error || function() {
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console.error('Backbone sync error:', arguments);
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};
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if (this.comm === undefined) {
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error();
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return false;
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}
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// Delete any key value pairs that the back-end already knows about.
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var attrs = (method === 'patch') ? options.attrs : model.toJSON(options);
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if (this.key_value_lock !== null) {
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var key = this.key_value_lock[0];
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var value = this.key_value_lock[1];
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if (attrs[key] === value) {
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delete attrs[key];
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}
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}
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// Only sync if there are attributes to send to the back-end.
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attrs = this._pack_models(attrs);
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if (_.size(attrs) > 0) {
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// If this message was sent via backbone itself, it will not
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// have any callbacks. It's important that we create callbacks
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// so we can listen for status messages, etc...
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var callbacks = options.callbacks || this.callbacks();
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// Check throttle.
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if (this.pending_msgs >= (this.get('msg_throttle') || 3)) {
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// The throttle has been exceeded, buffer the current msg so
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// it can be sent once the kernel has finished processing
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// some of the existing messages.
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// Combine updates if it is a 'patch' sync, otherwise replace updates
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switch (method) {
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case 'patch':
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this.msg_buffer = $.extend(this.msg_buffer || {}, attrs);
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break;
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case 'update':
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case 'create':
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this.msg_buffer = attrs;
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break;
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default:
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error();
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return false;
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}
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this.msg_buffer_callbacks = callbacks;
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} else {
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// We haven't exceeded the throttle, send the message like
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// normal.
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var data = {method: 'backbone', sync_data: attrs};
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this.comm.send(data, callbacks);
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this.pending_msgs++;
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}
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}
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// Since the comm is a one-way communication, assume the message
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// arrived. Don't call success since we don't have a model back from the server
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// this means we miss out on the 'sync' event.
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this._buffered_state_diff = {};
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},
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save_changes: function(callbacks) {
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// Push this model's state to the back-end
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//
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// This invokes a Backbone.Sync.
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this.save(this._buffered_state_diff, {patch: true, callbacks: callbacks});
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},
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_pack_models: function(value) {
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// Replace models with model ids recursively.
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if (value instanceof Backbone.Model) {
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return value.id;
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} else if ($.isArray(value)) {
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var packed = [];
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var that = this;
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_.each(value, function(sub_value, key) {
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packed.push(that._pack_models(sub_value));
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});
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return packed;
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} else if (value instanceof Object) {
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var packed = {};
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var that = this;
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_.each(value, function(sub_value, key) {
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packed[key] = that._pack_models(sub_value);
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});
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return packed;
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} else {
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return value;
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}
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},
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_unpack_models: function(value) {
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// Replace model ids with models recursively.
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if ($.isArray(value)) {
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var unpacked = [];
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var that = this;
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_.each(value, function(sub_value, key) {
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unpacked.push(that._unpack_models(sub_value));
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});
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return unpacked;
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} else if (value instanceof Object) {
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var unpacked = {};
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var that = this;
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_.each(value, function(sub_value, key) {
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unpacked[key] = that._unpack_models(sub_value);
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});
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return unpacked;
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} else {
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var model = this.widget_manager.get_model(value);
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if (model) {
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return model;
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} else {
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return value;
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}
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}
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},
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});
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WidgetManager.register_widget_model('WidgetModel', WidgetModel);
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var WidgetView = Backbone.View.extend({
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initialize: function(parameters) {
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// Public constructor.
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this.model.on('change',this.update,this);
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this.options = parameters.options;
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this.child_views = [];
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this.model.views.push(this);
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},
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update: function(){
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// Triggered on model change.
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//
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// Update view to be consistent with this.model
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},
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create_child_view: function(child_model, options) {
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// Create and return a child view.
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//
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// -given a model and (optionally) a view name if the view name is
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// not given, it defaults to the model's default view attribute.
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// TODO: this is hacky, and makes the view depend on this cell attribute and widget manager behavior
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// it would be great to have the widget manager add the cell metadata
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// to the subview without having to add it here.
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var child_view = this.model.widget_manager.create_view(child_model, options || {}, this);
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this.child_views[child_model.id] = child_view;
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return child_view;
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},
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delete_child_view: function(child_model, options) {
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// Delete a child view that was previously created using create_child_view.
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var view = this.child_views[child_model.id];
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if (view !== undefined) {
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delete this.child_views[child_model.id];
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view.remove();
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}
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},
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do_diff: function(old_list, new_list, removed_callback, added_callback) {
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// Difference a changed list and call remove and add callbacks for
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// each removed and added item in the new list.
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//
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// Parameters
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// ----------
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// old_list : array
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// new_list : array
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// removed_callback : Callback(item)
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// Callback that is called for each item removed.
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// added_callback : Callback(item)
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// Callback that is called for each item added.
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// removed items
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_.each(_.difference(old_list, new_list), function(item, index, list) {
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removed_callback(item);
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}, this);
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// added items
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_.each(_.difference(new_list, old_list), function(item, index, list) {
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added_callback(item);
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}, this);
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},
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callbacks: function(){
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// Create msg callbacks for a comm msg.
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return this.model.callbacks(this);
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},
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render: function(){
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// Render the view.
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//
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// By default, this is only called the first time the view is created
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},
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send: function (content) {
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// Send a custom msg associated with this view.
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this.model.send(content, this.callbacks());
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},
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touch: function () {
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this.model.save_changes(this.callbacks());
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},
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});
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var DOMWidgetView = WidgetView.extend({
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initialize: function (options) {
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// Public constructor
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// In the future we may want to make changes more granular
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// (e.g., trigger on visible:change).
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this.model.on('change', this.update, this);
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this.model.on('msg:custom', this.on_msg, this);
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DOMWidgetView.__super__.initialize.apply(this, arguments);
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},
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on_msg: function(msg) {
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// Handle DOM specific msgs.
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switch(msg.msg_type) {
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case 'add_class':
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this.add_class(msg.selector, msg.class_list);
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break;
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case 'remove_class':
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this.remove_class(msg.selector, msg.class_list);
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break;
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}
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},
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add_class: function (selector, class_list) {
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// Add a DOM class to an element.
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this._get_selector_element(selector).addClass(class_list);
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},
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remove_class: function (selector, class_list) {
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// Remove a DOM class from an element.
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this._get_selector_element(selector).removeClass(class_list);
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},
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update: function () {
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// Update the contents of this view
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//
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// Called when the model is changed. The model may have been
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// changed by another view or by a state update from the back-end.
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// The very first update seems to happen before the element is
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// finished rendering so we use setTimeout to give the element time
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// to render
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var e = this.$el;
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var visible = this.model.get('visible');
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setTimeout(function() {e.toggle(visible);},0);
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var css = this.model.get('_css');
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if (css === undefined) {return;}
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var that = this;
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_.each(css, function(css_traits, selector){
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// Apply the css traits to all elements that match the selector.
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var elements = that._get_selector_element(selector);
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if (elements.length > 0) {
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_.each(css_traits, function(css_value, css_key){
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elements.css(css_key, css_value);
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});
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}
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});
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},
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_get_selector_element: function (selector) {
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// Get the elements via the css selector.
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// If the selector is blank, apply the style to the $el_to_style
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// element. If the $el_to_style element is not defined, use apply
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// the style to the view's element.
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var elements;
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if (!selector) {
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if (this.$el_to_style === undefined) {
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elements = this.$el;
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} else {
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elements = this.$el_to_style;
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}
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} else {
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elements = this.$el.find(selector);
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}
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return elements;
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},
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});
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IPython.WidgetModel = WidgetModel;
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IPython.WidgetView = WidgetView;
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IPython.DOMWidgetView = DOMWidgetView;
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// Pass through WidgetManager namespace.
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return WidgetManager;
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});
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