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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(["widgets/js/manager",
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"underscore",
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"backbone",
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"jquery",
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"base/js/namespace",
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], function(widgetmanager, _, Backbone, $, IPython){
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var WidgetModel = Backbone.Model.extend({
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constructor: function (widget_manager, model_id, comm, init_state_callback) {
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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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// init_state_callback : callback (optional)
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// Called once when the first state message is recieved from
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// the back-end.
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this.widget_manager = widget_manager;
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this.init_state_callback = init_state_callback;
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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.state_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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this.stopListening();
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this.trigger('destroy', this);
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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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for (var id in this.views) {
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if (this.views.hasOwnProperty(id)) {
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this.views[id].remove();
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}
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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.set_state(msg.content.data.state);
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if (this.init_state_callback) {
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this.init_state_callback.apply(this, [this]);
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delete this.init_state_callback;
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}
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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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set_state: function (state) {
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// Handle when a widget is updated via the python side.
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this.state_lock = state;
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try {
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var that = this;
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WidgetModel.__super__.set.apply(this, [Object.keys(state).reduce(function(obj, key) {
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obj[key] = that._unpack_models(state[key]);
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return obj;
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}, {})]);
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} finally {
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this.state_lock = null;
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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.state_lock !== null) {
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var keys = Object.keys(this.state_lock);
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for (var i=0; i<keys.length; i++) {
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var key = keys[i];
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if (attrs[key] === this.state_lock[key]) {
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delete attrs[key];
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}
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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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var that = this;
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var packed;
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if (value instanceof Backbone.Model) {
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return "IPY_MODEL_" + value.id;
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} else if ($.isArray(value)) {
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packed = [];
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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 Date) {
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return value;
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} else if (value instanceof Object) {
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packed = {};
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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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var that = this;
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var unpacked;
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if ($.isArray(value)) {
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unpacked = [];
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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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unpacked = {};
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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 if (typeof value === 'string' && value.slice(0,10) === "IPY_MODEL_") {
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var model = this.widget_manager.get_model(value.slice(10, value.length));
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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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} else {
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return value;
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}
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},
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on_some_change: function(keys, callback, context) {
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// on_some_change(["key1", "key2"], foo, context) differs from
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// on("change:key1 change:key2", foo, context).
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// If the widget attributes key1 and key2 are both modified,
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// the second form will result in foo being called twice
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// while the first will call foo only once.
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this.on('change', function() {
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if (keys.some(this.hasChanged, this)) {
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callback.apply(context);
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}
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}, this);
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},
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});
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widgetmanager.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_model_views = {};
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this.child_views = {};
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this.id = this.id || IPython.utils.uuid();
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this.model.views[this.id] = this;
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this.on('displayed', function() {
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this.is_displayed = true;
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}, 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 that = this;
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var old_callback = options.callback || function(view) {};
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options = $.extend({ parent: this, success: function(child_view) {
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// Associate the view id with the model id.
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if (that.child_model_views[child_model.id] === undefined) {
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that.child_model_views[child_model.id] = [];
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}
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that.child_model_views[child_model.id].push(child_view.id);
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// Remember the view by id.
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that.child_views[child_view.id] = child_view;
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old_callback(child_view);
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}}, options || {});
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this.model.widget_manager.create_view(child_model, options);
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},
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pop_child_view: function(child_model) {
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// Delete a child view that was previously created using create_child_view.
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var view_ids = this.child_model_views[child_model.id];
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if (view_ids !== undefined) {
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// Only delete the first view in the list.
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var view_id = view_ids[0];
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var view = this.child_views[view_id];
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delete this.child_views[view_id];
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view_ids.splice(0,1);
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delete child_model.views[view_id];
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// Remove the view list specific to this model if it is empty.
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if (view_ids.length === 0) {
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delete this.child_model_views[child_model.id];
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}
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return view;
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}
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return null;
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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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// Walk the lists until an unequal entry is found.
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var i;
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for (i = 0; i < new_list.length; i++) {
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if (i >= old_list.length || new_list[i] !== old_list[i]) {
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break;
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}
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}
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// Remove the non-matching items from the old list.
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for (var j = i; j < old_list.length; j++) {
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removed_callback(old_list[j]);
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}
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// Add the rest of the new list items.
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for (; i < new_list.length; i++) {
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added_callback(new_list[i]);
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}
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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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show: function(){
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// Show the widget-area
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if (this.options && this.options.cell &&
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this.options.cell.widget_area !== undefined) {
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this.options.cell.widget_area.show();
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}
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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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after_displayed: function (callback, context) {
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// Calls the callback right away is the view is already displayed
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// otherwise, register the callback to the 'displayed' event.
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if (this.is_displayed) {
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callback.apply(context);
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} else {
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this.on('displayed', callback, context);
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}
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},
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});
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var DOMWidgetView = WidgetView.extend({
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initialize: function (parameters) {
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// Public constructor
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DOMWidgetView.__super__.initialize.apply(this, [parameters]);
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this.on('displayed', this.show, this);
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this.model.on('change:visible', this.update_visible, this);
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this.model.on('change:_css', this.update_css, this);
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this.model.on('change:_dom_classes', function(model, new_classes) {
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var old_classes = model.previous('_dom_classes');
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this.update_classes(old_classes, new_classes);
|
|
|
}, this);
|
|
|
|
|
|
this.model.on('change:color', function (model, value) {
|
|
|
this.update_attr('color', value); }, this);
|
|
|
|
|
|
this.model.on('change:background_color', function (model, value) {
|
|
|
this.update_attr('background', value); }, this);
|
|
|
|
|
|
this.model.on('change:width', function (model, value) {
|
|
|
this.update_attr('width', value); }, this);
|
|
|
|
|
|
this.model.on('change:height', function (model, value) {
|
|
|
this.update_attr('height', value); }, this);
|
|
|
|
|
|
this.model.on('change:border_color', function (model, value) {
|
|
|
this.update_attr('border-color', value); }, this);
|
|
|
|
|
|
this.model.on('change:border_width', function (model, value) {
|
|
|
this.update_attr('border-width', value); }, this);
|
|
|
|
|
|
this.model.on('change:border_style', function (model, value) {
|
|
|
this.update_attr('border-style', value); }, this);
|
|
|
|
|
|
this.model.on('change:font_style', function (model, value) {
|
|
|
this.update_attr('font-style', value); }, this);
|
|
|
|
|
|
this.model.on('change:font_weight', function (model, value) {
|
|
|
this.update_attr('font-weight', value); }, this);
|
|
|
|
|
|
this.model.on('change:font_size', function (model, value) {
|
|
|
this.update_attr('font-size', this._default_px(value)); }, this);
|
|
|
|
|
|
this.model.on('change:font_family', function (model, value) {
|
|
|
this.update_attr('font-family', value); }, this);
|
|
|
|
|
|
this.model.on('change:padding', function (model, value) {
|
|
|
this.update_attr('padding', value); }, this);
|
|
|
|
|
|
this.model.on('change:margin', function (model, value) {
|
|
|
this.update_attr('margin', this._default_px(value)); }, this);
|
|
|
|
|
|
this.model.on('change:border_radius', function (model, value) {
|
|
|
this.update_attr('border-radius', this._default_px(value)); }, this);
|
|
|
|
|
|
this.after_displayed(function() {
|
|
|
this.update_visible(this.model, this.model.get("visible"));
|
|
|
this.update_classes([], this.model.get('_dom_classes'));
|
|
|
|
|
|
this.update_attr('color', this.model.get('color'));
|
|
|
this.update_attr('background', this.model.get('background_color'));
|
|
|
this.update_attr('width', this.model.get('width'));
|
|
|
this.update_attr('height', this.model.get('height'));
|
|
|
this.update_attr('border-color', this.model.get('border_color'));
|
|
|
this.update_attr('border-width', this.model.get('border_width'));
|
|
|
this.update_attr('border-style', this.model.get('border_style'));
|
|
|
this.update_attr('font-style', this.model.get('font_style'));
|
|
|
this.update_attr('font-weight', this.model.get('font_weight'));
|
|
|
this.update_attr('font-size', this.model.get('font_size'));
|
|
|
this.update_attr('font-family', this.model.get('font_family'));
|
|
|
this.update_attr('padding', this.model.get('padding'));
|
|
|
this.update_attr('margin', this.model.get('margin'));
|
|
|
this.update_attr('border-radius', this.model.get('border_radius'));
|
|
|
|
|
|
this.update_css(this.model, this.model.get("_css"));
|
|
|
}, this);
|
|
|
},
|
|
|
|
|
|
_default_px: function(value) {
|
|
|
// Makes browser interpret a numerical string as a pixel value.
|
|
|
if (/^\d+\.?(\d+)?$/.test(value.trim())) {
|
|
|
return value.trim() + 'px';
|
|
|
}
|
|
|
return value;
|
|
|
},
|
|
|
|
|
|
update_attr: function(name, value) {
|
|
|
// Set a css attr of the widget view.
|
|
|
this.$el.css(name, value);
|
|
|
},
|
|
|
|
|
|
update_visible: function(model, value) {
|
|
|
// Update visibility
|
|
|
this.$el.toggle(value);
|
|
|
},
|
|
|
|
|
|
update_css: function (model, css) {
|
|
|
// Update the css styling of this view.
|
|
|
var e = this.$el;
|
|
|
if (css === undefined) {return;}
|
|
|
for (var i = 0; i < css.length; i++) {
|
|
|
// Apply the css traits to all elements that match the selector.
|
|
|
var selector = css[i][0];
|
|
|
var elements = this._get_selector_element(selector);
|
|
|
if (elements.length > 0) {
|
|
|
var trait_key = css[i][1];
|
|
|
var trait_value = css[i][2];
|
|
|
elements.css(trait_key ,trait_value);
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
|
|
|
update_classes: function (old_classes, new_classes, $el) {
|
|
|
// Update the DOM classes applied to an element, default to this.$el.
|
|
|
if ($el===undefined) {
|
|
|
$el = this.$el;
|
|
|
}
|
|
|
this.do_diff(old_classes, new_classes, function(removed) {
|
|
|
$el.removeClass(removed);
|
|
|
}, function(added) {
|
|
|
$el.addClass(added);
|
|
|
});
|
|
|
},
|
|
|
|
|
|
update_mapped_classes: function(class_map, trait_name, previous_trait_value, $el) {
|
|
|
// Update the DOM classes applied to the widget based on a single
|
|
|
// trait's value.
|
|
|
//
|
|
|
// Given a trait value classes map, this function automatically
|
|
|
// handles applying the appropriate classes to the widget element
|
|
|
// and removing classes that are no longer valid.
|
|
|
//
|
|
|
// Parameters
|
|
|
// ----------
|
|
|
// class_map: dictionary
|
|
|
// Dictionary of trait values to class lists.
|
|
|
// Example:
|
|
|
// {
|
|
|
// success: ['alert', 'alert-success'],
|
|
|
// info: ['alert', 'alert-info'],
|
|
|
// warning: ['alert', 'alert-warning'],
|
|
|
// danger: ['alert', 'alert-danger']
|
|
|
// };
|
|
|
// trait_name: string
|
|
|
// Name of the trait to check the value of.
|
|
|
// previous_trait_value: optional string, default ''
|
|
|
// Last trait value
|
|
|
// $el: optional jQuery element handle, defaults to this.$el
|
|
|
// Element that the classes are applied to.
|
|
|
var key = previous_trait_value;
|
|
|
if (key === undefined) {
|
|
|
key = this.model.previous(trait_name);
|
|
|
}
|
|
|
var old_classes = class_map[key] ? class_map[key] : [];
|
|
|
key = this.model.get(trait_name);
|
|
|
var new_classes = class_map[key] ? class_map[key] : [];
|
|
|
|
|
|
this.update_classes(old_classes, new_classes, $el || this.$el);
|
|
|
},
|
|
|
|
|
|
_get_selector_element: function (selector) {
|
|
|
// Get the elements via the css selector.
|
|
|
var elements;
|
|
|
if (!selector) {
|
|
|
elements = this.$el;
|
|
|
} else {
|
|
|
elements = this.$el.find(selector).addBack(selector);
|
|
|
}
|
|
|
return elements;
|
|
|
},
|
|
|
});
|
|
|
|
|
|
|
|
|
var widget = {
|
|
|
'WidgetModel': WidgetModel,
|
|
|
'WidgetView': WidgetView,
|
|
|
'DOMWidgetView': DOMWidgetView,
|
|
|
};
|
|
|
|
|
|
// For backwards compatability.
|
|
|
$.extend(IPython, widget);
|
|
|
|
|
|
return widget;
|
|
|
});
|
|
|
|
