work-in-progress for custom js serializers

IPython/html/static/widgets/js/types.js

@@ -0,0 +1,50 b''
+// Copyright (c) IPython Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+define([
+    "base/js/utils"
+], function(utils){
+
+    return {
+        widget_serialization: {
+            deserialize: function deserialize_models(value, model) {
+                /**
+                 * Replace model ids with models recursively.
+                 */
+                var unpacked;
+                if ($.isArray(value)) {
+                    unpacked = [];
+                    _.each(value, function(sub_value, key) {
+                        unpacked.push(deserialize_models(sub_value, model));
+                    });
+                    return Promise.all(unpacked);
+                } else if (value instanceof Object) {
+                    unpacked = {};
+                    _.each(value, function(sub_value, key) {
+                        unpacked[key] = deserialize_models(sub_value, model);
+                    });
+                    return utils.resolve_promises_dict(unpacked);
+                } else if (typeof value === 'string' && value.slice(0,10) === "IPY_MODEL_") {
+                    // get_model returns a promise already
+                    return model.widget_manager.get_model(value.slice(10, value.length));
+                } else {
+                    return Promise.resolve(value);
+                }
+            },
+        },
+        
+        list_of_numbers: {
+            deserialize: function (value, model) {
+                /* value is a DataView */
+                /* create a float64 typed array */
+                return new Float64Array(value.buffer)
+            },
+            serialize: function (value, model) {
+                return value;
+            },
+        }
+    }
+
+    
+
+});

IPython/html/static/widgets/js/widget.js

@@ -1,763 +1,813 b''
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define(["widgets/js/manager",
         "underscore",
         "backbone",
         "jquery",
         "base/js/utils",
         "base/js/namespace",
 ], function(widgetmanager, _, Backbone, $, utils, IPython){
     "use strict";
 
     var WidgetModel = Backbone.Model.extend({
         constructor: function (widget_manager, model_id, comm) {
             /**
              * Constructor
              *
              * Creates a WidgetModel instance.
              *
              * Parameters
              * ----------
              * widget_manager : WidgetManager instance
              * model_id : string
              *      An ID unique to this model.
              * comm : Comm instance (optional)
              */
             this.widget_manager = widget_manager;
             this.state_change = Promise.resolve();
             this._buffered_state_diff = {};
             this.pending_msgs = 0;
             this.msg_buffer = null;
             this.state_lock = null;
             this.id = model_id;
             this.views = {};
+            this.serializers = {};
             this._resolve_received_state = {};
 
             if (comm !== undefined) {
                 // Remember comm associated with the model.
                 this.comm = comm;
                 comm.model = this;
 
                 // Hook comm messages up to model.
                 comm.on_close($.proxy(this._handle_comm_closed, this));
                 comm.on_msg($.proxy(this._handle_comm_msg, this));
 
                 // Assume the comm is alive.
                 this.set_comm_live(true);
             } else {
                 this.set_comm_live(false);
             }
 
             // Listen for the events that lead to the websocket being terminated.
             var that = this;
             var died = function() {
                 that.set_comm_live(false);
             };
             widget_manager.notebook.events.on('kernel_disconnected.Kernel', died);
             widget_manager.notebook.events.on('kernel_killed.Kernel', died);
             widget_manager.notebook.events.on('kernel_restarting.Kernel', died);
             widget_manager.notebook.events.on('kernel_dead.Kernel', died);
 
             return Backbone.Model.apply(this);
         },
 
-        send: function (content, callbacks) {
+        send: function (content, callbacks, buffers) {
             /**
              * Send a custom msg over the comm.
              */
             if (this.comm !== undefined) {
                 var data = {method: 'custom', content: content};
-                this.comm.send(data, callbacks);
+                this.comm.send(data, callbacks, {}, buffers);
                 this.pending_msgs++;
             }
         },
 
         request_state: function(callbacks) {
             /** 
              * Request a state push from the back-end.
              */
             if (!this.comm) {
                 console.error("Could not request_state because comm doesn't exist!");
                 return;
             }
 
             var msg_id = this.comm.send({method: 'request_state'}, callbacks || this.widget_manager.callbacks());
 
             // Promise that is resolved when a state is received
             // from the back-end.
             var that = this;
             var received_state = new Promise(function(resolve) {
                 that._resolve_received_state[msg_id] = resolve;
             });
             return received_state;
         },
 
         set_comm_live: function(live) {
             /** 
              * Change the comm_live state of the model.
              */
             if (this.comm_live === undefined || this.comm_live != live) {
                 this.comm_live = live;
                 this.trigger(live ? 'comm:live' : 'comm:dead', {model: this});
             }
         },
 
         close: function(comm_closed) {
             /**
              * Close model
              */
             if (this.comm && !comm_closed) {
                 this.comm.close();
             }
             this.stopListening();
             this.trigger('destroy', this);
             delete this.comm.model; // Delete ref so GC will collect widget model.
             delete this.comm;
             delete this.model_id; // Delete id from model so widget manager cleans up.
             _.each(this.views, function(v, id, views) {
                 v.then(function(view) {
                     view.remove();
                     delete views[id];
                 });
             });
         },
 
         _handle_comm_closed: function (msg) {
             /** 
              * Handle when a widget is closed.
              */
             this.trigger('comm:close');
             this.close(true);
         },
 
         _handle_comm_msg: function (msg) {
             /**
              * Handle incoming comm msg.
              */
             var method = msg.content.data.method;
+            
             var that = this;
             switch (method) {
                 case 'update':
                     this.state_change = this.state_change
                         .then(function() {
-                            return that.set_state(msg.content.data.state);
+                            var state = msg.content.data.state || {};
+                            var buffer_keys = msg.content.data.buffers || [];
+                            var buffers = msg.buffers || [];
+                            var metadata = msg.content.data.metadata || {};
+                            var i,k;
+                            for (var i=0; i<buffer_keys.length; i++) {
+                                k = buffer_keys[i];
+                                state[k] = buffers[i];
+                            }
+
+                            // for any metadata specifying a deserializer, set the
+                            // state to a promise that resolves to the deserialized version
+                            // also, store the serialization function for the attribute
+                            var keys = Object.keys(metadata);
+                            for (var i=0; i<keys.length; i++) {
+                                k = keys[i];
+                                if (metadata[k] && metadata[k].serialization) {
+                                    that.serializers[k] = utils.load_class.apply(that,
+                                                                                 metadata[k].serialization);
+                                    state[k] = that.deserialize(that.serializers[k], state[k]);
+                                }
+                            }
+                            return utils.resolve_promises_dict(state);
+                        }).then(function(state) {
+                            return that.set_state(state);
                         }).catch(utils.reject("Couldn't process update msg for model id '" + String(that.id) + "'", true))
                         .then(function() {
                             var parent_id = msg.parent_header.msg_id;
                             if (that._resolve_received_state[parent_id] !== undefined) {
                                 that._resolve_received_state[parent_id].call();
                                 delete that._resolve_received_state[parent_id];
                             }
                         }).catch(utils.reject("Couldn't resolve state request promise", true));
                     break;
                 case 'custom':
-                    this.trigger('msg:custom', msg.content.data.content);
+                    this.trigger('msg:custom', msg.content.data.content, msg.buffers);
                     break;
                 case 'display':
                     this.state_change = this.state_change.then(function() {
                         that.widget_manager.display_view(msg, that);
                     }).catch(utils.reject('Could not process display view msg', true));
                     break;
             }
         },
 
+        deserialize: function(serializer, value) {
+            // given a serializer dict and a value,
+            // return a promise for the deserialized value
+            var that = this;
+            return serializer.then(function(s) {
+                if (s.deserialize) {
+                    return s.deserialize(value, that);
+                } else {
+                    return value;
+                }
+            });
+        },
+
         set_state: function (state) {
             var that = this;
             // Handle when a widget is updated via the python side.
-            return this._unpack_models(state).then(function(state) {
+            return new Promise(function(resolve, reject) {
                 that.state_lock = state;
                 try {
                     WidgetModel.__super__.set.call(that, state);
                 } finally {
                     that.state_lock = null;
                 }
+                resolve();
             }).catch(utils.reject("Couldn't set model state", true));
         },
 
         get_state: function() {
             // Get the serializable state of the model.
-            var state = this.toJSON();
-            for (var key in state) {
-                if (state.hasOwnProperty(key)) {
-                    state[key] = this._pack_models(state[key]);
-                }
-            }
-            return state;
+            // Equivalent to Backbone.Model.toJSON()
+            return _.clone(this.attributes);
         },
-
+        
         _handle_status: function (msg, callbacks) {
             /**
              * Handle status msgs.
              *
              * execution_state : ('busy', 'idle', 'starting')
              */
             if (this.comm !== undefined) {
                 if (msg.content.execution_state ==='idle') {
                     // Send buffer if this message caused another message to be
                     // throttled.
                     if (this.msg_buffer !== null &&
                         (this.get('msg_throttle') || 3) === this.pending_msgs) {
                         var data = {method: 'backbone', sync_method: 'update', sync_data: this.msg_buffer};
                         this.comm.send(data, callbacks);
                         this.msg_buffer = null;
                     } else {
                         --this.pending_msgs;
                     }
                 }
             }
         },
 
         callbacks: function(view) {
             /**
              * Create msg callbacks for a comm msg.
              */
             var callbacks = this.widget_manager.callbacks(view);
 
             if (callbacks.iopub === undefined) {
                 callbacks.iopub = {};
             }
 
             var that = this;
             callbacks.iopub.status = function (msg) {
                 that._handle_status(msg, callbacks);
             };
             return callbacks;
         },
 
         set: function(key, val, options) {
             /**
              * Set a value.
              */
             var return_value = WidgetModel.__super__.set.apply(this, arguments);
 
             // Backbone only remembers the diff of the most recent set()
             // operation.  Calling set multiple times in a row results in a 
             // loss of diff information.  Here we keep our own running diff.
             this._buffered_state_diff = $.extend(this._buffered_state_diff, this.changedAttributes() || {});
             return return_value;
         },
 
         sync: function (method, model, options) {
             /**
              * Handle sync to the back-end.  Called when a model.save() is called.
              *
              * Make sure a comm exists.
+
+             * Parameters
+             * ----------
+             * method : create, update, patch, delete, read
+             *   create/update always send the full attribute set
+             *   patch - only send attributes listed in options.attrs, and if we are queuing
+             *     up messages, combine with previous messages that have not been sent yet
+             * model : the model we are syncing
+             *   will normally be the same as `this`
+             * options : dict
+             *   the `attrs` key, if it exists, gives an {attr: value} dict that should be synced,
+             *   otherwise, sync all attributes
+             * 
              */
             var error = options.error || function() {
                 console.error('Backbone sync error:', arguments);
             };
             if (this.comm === undefined) {
                 error();
                 return false;
             }
 
-            // Delete any key value pairs that the back-end already knows about.
-            var attrs = (method === 'patch') ? options.attrs : model.toJSON(options);
+            var attrs = (method === 'patch') ? options.attrs : model.get_state(options);
+
+            // the state_lock lists attributes that are currently be changed right now from a kernel message
+            // we don't want to send these non-changes back to the kernel, so we delete them out of attrs
+            // (but we only delete them if the value hasn't changed from the value stored in the state_lock
             if (this.state_lock !== null) {
                 var keys = Object.keys(this.state_lock);
                 for (var i=0; i<keys.length; i++) {
                     var key = keys[i];
                     if (attrs[key] === this.state_lock[key]) {
                         delete attrs[key];
                     }
                 }
             }
-
-            // Only sync if there are attributes to send to the back-end.
-            attrs = this._pack_models(attrs);
+            
             if (_.size(attrs) > 0) {
 
                 // If this message was sent via backbone itself, it will not
                 // have any callbacks.  It's important that we create callbacks
                 // so we can listen for status messages, etc...
                 var callbacks = options.callbacks || this.callbacks();
 
                 // Check throttle.
                 if (this.pending_msgs >= (this.get('msg_throttle') || 3)) {
                     // The throttle has been exceeded, buffer the current msg so
                     // it can be sent once the kernel has finished processing 
                     // some of the existing messages.
                     
                     // Combine updates if it is a 'patch' sync, otherwise replace updates
                     switch (method) {
                         case 'patch':
                             this.msg_buffer = $.extend(this.msg_buffer || {}, attrs);
                             break;
                         case 'update':
                         case 'create':
                             this.msg_buffer = attrs;
                             break;
                         default:
                             error();
                             return false;
                     }
                     this.msg_buffer_callbacks = callbacks;
 
                 } else {
                     // We haven't exceeded the throttle, send the message like 
                     // normal.
-                    var data = {method: 'backbone', sync_data: attrs};
-                    this.comm.send(data, callbacks);
-                    this.pending_msgs++;
+                    this.send_sync_message(attrs, callbacks);
                 }
             }
             // Since the comm is a one-way communication, assume the message 
             // arrived.  Don't call success since we don't have a model back from the server
             // this means we miss out on the 'sync' event.
             this._buffered_state_diff = {};
         },
 
-        save_changes: function(callbacks) {
-            /**
-             * Push this model's state to the back-end
-             *
-             * This invokes a Backbone.Sync.
-             */
-            this.save(this._buffered_state_diff, {patch: true, callbacks: callbacks});
-        },
 
-        _pack_models: function(value) {
-            /**
-             * Replace models with model ids recursively.
-             */
+        send_sync_message: function(attrs, callbacks) {
+            // prepare and send a comm message syncing attrs
             var that = this;
-            var packed;
-            if (value instanceof Backbone.Model) {
-                return "IPY_MODEL_" + value.id;
-
-            } else if ($.isArray(value)) {
-                packed = [];
-                _.each(value, function(sub_value, key) {
-                    packed.push(that._pack_models(sub_value));
-                });
-                return packed;
-            } else if (value instanceof Date || value instanceof String) {
-                return value;
-            } else if (value instanceof Object) {
-                packed = {};
-                _.each(value, function(sub_value, key) {
-                    packed[key] = that._pack_models(sub_value);
-                });
-                return packed;
-
-            } else {
-                return value;
+            // first, build a state dictionary with key=the attribute and the value
+            // being the value or the promise of the serialized value
+            var state_promise_dict = {};
+            var keys = Object.keys(attrs);
+            for (var i=0; i<keys.length; i++) {
+                // bind k and v locally; needed since we have an inner async function using v
+                (function(k,v) {
+                    if (that.serializers[k]) {
+                        state_promise_dict[k] = that.serializers[k].then(function(f) {
+                            if (f.serialize) {
+                                return f.serialize(v, that);
+                            } else {
+                                return v;
+                            }
+                        })
+                    } else {
+                        state_promise_dict[k] = v;
+                    }
+                })(keys[i], attrs[keys[i]])
+            }
+            utils.resolve_promises_dict(state_promise_dict).then(function(state) {
+                // get binary values, then send
+                var keys = Object.keys(state);
+                var buffers = [];
+                var buffer_keys = [];
+                for (var i=0; i<keys.length; i++) {
+                    var key = keys[i];
+                    var value = state[key];
+                    if (value.buffer instanceof ArrayBuffer
+                        || value instanceof ArrayBuffer) {
+                        buffers.push(value);
+                        buffer_keys.push(key);
+                        delete state[key];
+                    }
+                }
+                that.comm.send({method: 'backbone', sync_data: state, buffer_keys: buffer_keys}, callbacks, {}, buffers);
+                that.pending_msgs++;
+            })
+        },
+        
+        serialize: function(model, attrs) {
+            // Serialize the attributes into a sync message
+            var keys = Object.keys(attrs);            
+            var key, value;
+            var buffers, metadata, buffer_keys, serialize;
+            for (var i=0; i<keys.length; i++) {
+                key = keys[i];
+                serialize = model.serializers[key];
+                if (serialize && serialize.serialize) {
+                    attrs[key] = serialize.serialize(attrs[key]);
+                }
             }
         },
 
-        _unpack_models: function(value) {
+        save_changes: function(callbacks) {
             /**
-             * Replace model ids with models recursively.
+             * Push this model's state to the back-end
+             *
+             * This invokes a Backbone.Sync.
              */
-            var that = this;
-            var unpacked;
-            if ($.isArray(value)) {
-                unpacked = [];
-                _.each(value, function(sub_value, key) {
-                    unpacked.push(that._unpack_models(sub_value));
-                });
-                return Promise.all(unpacked);
-            } else if (value instanceof Object) {
-                unpacked = {};
-                _.each(value, function(sub_value, key) {
-                    unpacked[key] = that._unpack_models(sub_value);
-                });
-                return utils.resolve_promises_dict(unpacked);
-            } else if (typeof value === 'string' && value.slice(0,10) === "IPY_MODEL_") {
-                // get_model returns a promise already
-                return this.widget_manager.get_model(value.slice(10, value.length));
-            } else {
-                return Promise.resolve(value);
-            }
+            this.save(this._buffered_state_diff, {patch: true, callbacks: callbacks});
         },
 
         on_some_change: function(keys, callback, context) {
             /**
              * on_some_change(["key1", "key2"], foo, context) differs from
              * on("change:key1 change:key2", foo, context).
              * If the widget attributes key1 and key2 are both modified, 
              * the second form will result in foo being called twice
              * while the first will call foo only once.
              */
             this.on('change', function() {
                 if (keys.some(this.hasChanged, this)) {
                     callback.apply(context);
                 }
             }, this);
 
-       },
+        },
     });
     widgetmanager.WidgetManager.register_widget_model('WidgetModel', WidgetModel);
 
 
     var WidgetView = Backbone.View.extend({
         initialize: function(parameters) {
             /**
              * Public constructor.
              */
             this.model.on('change',this.update,this);
 
             // Bubble the comm live events.
             this.model.on('comm:live', function() {
                 this.trigger('comm:live', this);
             }, this);
             this.model.on('comm:dead', function() {
                 this.trigger('comm:dead', this);
             }, this);
 
             this.options = parameters.options;
             this.on('displayed', function() { 
                 this.is_displayed = true; 
             }, this);
         },
 
         update: function(){
             /**
              * Triggered on model change.
              *
              * Update view to be consistent with this.model
              */
         },
 
         create_child_view: function(child_model, options) {
             /**
              * Create and promise that resolves to a child view of a given model
              */
             var that = this;
             options = $.extend({ parent: this }, options || {});
             return this.model.widget_manager.create_view(child_model, options).catch(utils.reject("Couldn't create child view"), true);
         },
 
         callbacks: function(){
             /**
              * Create msg callbacks for a comm msg.
              */
             return this.model.callbacks(this);
         },
 
         render: function(){
             /**
              * Render the view.
              *
              * By default, this is only called the first time the view is created
              */
         },
 
-        send: function (content) {
+        send: function (content, buffers) {
             /**
              * Send a custom msg associated with this view.
              */
-            this.model.send(content, this.callbacks());
+            this.model.send(content, this.callbacks(), buffers);
         },
 
         touch: function () {
             this.model.save_changes(this.callbacks());
         },
 
         after_displayed: function (callback, context) {
             /**
              * Calls the callback right away is the view is already displayed
              * otherwise, register the callback to the 'displayed' event.
              */
             if (this.is_displayed) {
                 callback.apply(context);
             } else {
                 this.on('displayed', callback, context);
             }
         },
 
         remove: function () {
             // Raise a remove event when the view is removed.
             WidgetView.__super__.remove.apply(this, arguments);
             this.trigger('remove');
         }
     });
 
 
     var DOMWidgetView = WidgetView.extend({
         initialize: function (parameters) {
             /**
              * Public constructor
              */
             DOMWidgetView.__super__.initialize.apply(this, [parameters]);
             this.model.on('change:visible', this.update_visible, this);
             this.model.on('change:_css', this.update_css, this);
 
             this.model.on('change:_dom_classes', function(model, new_classes) {
                 var old_classes = model.previous('_dom_classes');
                 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._default_px(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._default_px(this.model.get('margin')));
                 this.update_attr('border-radius', this._default_px(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
              */
             switch(value) {
                 case null: // python None
                     this.$el.show().css('visibility', 'hidden'); break;
                 case false:
                     this.$el.hide(); break;
                 case true:
                     this.$el.show().css('visibility', ''); break;
             }
          },
 
         update_css: function (model, css) {
             /**
              * Update the css styling of this view.
              */
             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;
             }
             _.difference(old_classes, new_classes).map(function(c) {$el.removeClass(c);})
             _.difference(new_classes, old_classes).map(function(c) {$el.addClass(c);})
         },
 
         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;
         },
 
         typeset: function(element, text){
             utils.typeset.apply(null, arguments);
         },
     });
 
 
     var ViewList = function(create_view, remove_view, context) {
         /**
          * - create_view and remove_view are default functions called when adding or removing views
          * - create_view takes a model and returns a view or a promise for a view for that model
          * - remove_view takes a view and destroys it (including calling `view.remove()`)
          * - each time the update() function is called with a new list, the create and remove
          *   callbacks will be called in an order so that if you append the views created in the
          *   create callback and remove the views in the remove callback, you will duplicate 
          *   the order of the list.
          * - the remove callback defaults to just removing the view (e.g., pass in null for the second parameter)
          * - the context defaults to the created ViewList.  If you pass another context, the create and remove
          *   will be called in that context.
          */
 
         this.initialize.apply(this, arguments);
     };
 
     _.extend(ViewList.prototype, {
         initialize: function(create_view, remove_view, context) {
             this._handler_context = context || this;
             this._models = [];
             this.views = []; // list of promises for views
             this._create_view = create_view;
             this._remove_view = remove_view || function(view) {view.remove();};
         },
 
         update: function(new_models, create_view, remove_view, context) {
             /**
              * the create_view, remove_view, and context arguments override the defaults
              * specified when the list is created.
              * after this function, the .views attribute is a list of promises for views
              * if you want to perform some action on the list of views, do something like
              * `Promise.all(myviewlist.views).then(function(views) {...});`
              */
             var remove = remove_view || this._remove_view;
             var create = create_view || this._create_view;
             context = context || this._handler_context;
             var i = 0;
             // first, skip past the beginning of the lists if they are identical
             for (; i < new_models.length; i++) {
                 if (i >= this._models.length || new_models[i] !== this._models[i]) {
                     break;
                 }
             }
             
             var first_removed = i;
             // Remove the non-matching items from the old list.
             var removed = this.views.splice(first_removed, this.views.length-first_removed);
             for (var j = 0; j < removed.length; j++) {
                 removed[j].then(function(view) {
                     remove.call(context, view)
                 });
             }
 
             // Add the rest of the new list items.
             for (; i < new_models.length; i++) {
                 this.views.push(Promise.resolve(create.call(context, new_models[i])));
             }
             // make a copy of the input array
             this._models = new_models.slice();
         },
 
         remove: function() {
             /**
              * removes every view in the list; convenience function for `.update([])`
              * that should be faster
              * returns a promise that resolves after this removal is done
              */
             var that = this;
             return Promise.all(this.views).then(function(views) {
                 for (var i = 0; i < that.views.length; i++) {
                     that._remove_view.call(that._handler_context, views[i]);
                 }
                 that.views = [];
                 that._models = [];
             });
         },
     });
 
     var widget = {
         'WidgetModel': WidgetModel,
         'WidgetView': WidgetView,
         'DOMWidgetView': DOMWidgetView,
         'ViewList': ViewList,
     };
 
     // For backwards compatability.
     $.extend(IPython, widget);
 
     return widget;
 });

IPython/html/widgets/widget.py

@@ -1,490 +1,543 b''
 """Base Widget class.  Allows user to create widgets in the back-end that render
 in the IPython notebook front-end.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from contextlib import contextmanager
 import collections
 
 from IPython.core.getipython import get_ipython
 from IPython.kernel.comm import Comm
 from IPython.config import LoggingConfigurable
 from IPython.utils.importstring import import_item
 from IPython.utils.traitlets import Unicode, Dict, Instance, Bool, List, \
     CaselessStrEnum, Tuple, CUnicode, Int, Set
 from IPython.utils.py3compat import string_types
 from .trait_types import Color
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 class CallbackDispatcher(LoggingConfigurable):
     """A structure for registering and running callbacks"""
     callbacks = List()
     
     def __call__(self, *args, **kwargs):
         """Call all of the registered callbacks."""
         value = None
         for callback in self.callbacks:
             try:
                 local_value = callback(*args, **kwargs)
             except Exception as e:
                 ip = get_ipython()
                 if ip is None:
                     self.log.warn("Exception in callback %s: %s", callback, e, exc_info=True)
                 else:
                     ip.showtraceback()
             else:
                 value = local_value if local_value is not None else value
         return value
 
     def register_callback(self, callback, remove=False):
         """(Un)Register a callback
 
         Parameters
         ----------
         callback: method handle
             Method to be registered or unregistered.
         remove=False: bool
             Whether to unregister the callback."""
         
         # (Un)Register the callback.
         if remove and callback in self.callbacks:
             self.callbacks.remove(callback)
         elif not remove and callback not in self.callbacks:
             self.callbacks.append(callback)
 
 def _show_traceback(method):
     """decorator for showing tracebacks in IPython"""
     def m(self, *args, **kwargs):
         try:
             return(method(self, *args, **kwargs))
         except Exception as e:
             ip = get_ipython()
             if ip is None:
                 self.log.warn("Exception in widget method %s: %s", method, e, exc_info=True)
             else:
                 ip.showtraceback()
     return m
 
 
 def register(key=None):
     """Returns a decorator registering a widget class in the widget registry. 
     If no key is provided, the class name is used as a key. A key is
     provided for each core IPython widget so that the frontend can use
     this key regardless of the language of the kernel"""
     def wrap(widget):
         l = key if key is not None else widget.__module__ + widget.__name__
         Widget.widget_types[l] = widget
         return widget
     return wrap
 
 
+def _widget_to_json(x):
+    if isinstance(x, dict):
+        return {k: _widget_to_json(v) for k, v in x.items()}
+    elif isinstance(x, (list, tuple)):
+        return [_widget_to_json(v) for v in x]
+    elif isinstance(x, Widget):
+        return "IPY_MODEL_" + x.model_id
+    else:
+        return x
+
+def _json_to_widget(x):
+    if isinstance(x, dict):
+        return {k: _json_to_widget(v) for k, v in x.items()}
+    elif isinstance(x, (list, tuple)):
+        return [_json_to_widget(v) for v in x]
+    elif isinstance(x, string_types) and x.startswith('IPY_MODEL_') and x[10:] in Widget.widgets:
+        return Widget.widgets[x[10:]]
+    else:
+        return x
+
+widget_serialization = {
+    'from_json': _json_to_widget,
+    'to_json': lambda x: (_widget_to_json(x), {'serialization': ('widget_serialization', 'widgets/js/types')})
+}
+
+def _to_binary_list(x):
+    import numpy
+    return memoryview(numpy.array(x, dtype=float)), {'serialization': ('list_of_numbers', 'widgets/js/types')}
+
+def _from_binary_list(x):
+    import numpy
+    a = numpy.frombuffer(x.tobytes(), dtype=float)
+    return list(a)
+
+list_of_numbers = {
+    'from_json': _from_binary_list,
+    'to_json': _to_binary_list
+}
+
+
+
 class Widget(LoggingConfigurable):
     #-------------------------------------------------------------------------
     # Class attributes
     #-------------------------------------------------------------------------
     _widget_construction_callback = None
     widgets = {}
     widget_types = {}
 
     @staticmethod
     def on_widget_constructed(callback):
         """Registers a callback to be called when a widget is constructed.
 
         The callback must have the following signature:
         callback(widget)"""
         Widget._widget_construction_callback = callback
 
     @staticmethod
     def _call_widget_constructed(widget):
         """Static method, called when a widget is constructed."""
         if Widget._widget_construction_callback is not None and callable(Widget._widget_construction_callback):
             Widget._widget_construction_callback(widget)
 
     @staticmethod
     def handle_comm_opened(comm, msg):
         """Static method, called when a widget is constructed."""
         widget_class = import_item(msg['content']['data']['widget_class'])
         widget = widget_class(comm=comm)
 
 
     #-------------------------------------------------------------------------
     # Traits
     #-------------------------------------------------------------------------
     _model_module = Unicode(None, allow_none=True, help="""A requirejs module name
         in which to find _model_name. If empty, look in the global registry.""")
     _model_name = Unicode('WidgetModel', help="""Name of the backbone model 
         registered in the front-end to create and sync this widget with.""")
     _view_module = Unicode(help="""A requirejs module in which to find _view_name.
         If empty, look in the global registry.""", sync=True)
     _view_name = Unicode(None, allow_none=True, help="""Default view registered in the front-end
         to use to represent the widget.""", sync=True)
     comm = Instance('IPython.kernel.comm.Comm')
     
     msg_throttle = Int(3, sync=True, help="""Maximum number of msgs the 
         front-end can send before receiving an idle msg from the back-end.""")
     
     version = Int(0, sync=True, help="""Widget's version""")
     keys = List()
     def _keys_default(self):
         return [name for name in self.traits(sync=True)]
     
     _property_lock = Tuple((None, None))
     _send_state_lock = Int(0)
     _states_to_send = Set()
     _display_callbacks = Instance(CallbackDispatcher, ())
     _msg_callbacks = Instance(CallbackDispatcher, ())
     
     #-------------------------------------------------------------------------
     # (Con/de)structor
     #-------------------------------------------------------------------------
     def __init__(self, **kwargs):
         """Public constructor"""
         self._model_id = kwargs.pop('model_id', None)
         super(Widget, self).__init__(**kwargs)
 
         Widget._call_widget_constructed(self)
         self.open()
 
     def __del__(self):
         """Object disposal"""
         self.close()
 
     #-------------------------------------------------------------------------
     # Properties
     #-------------------------------------------------------------------------
 
     def open(self):
         """Open a comm to the frontend if one isn't already open."""
         if self.comm is None:
             args = dict(target_name='ipython.widget',
                         data={'model_name': self._model_name,
                               'model_module': self._model_module})
             if self._model_id is not None:
                 args['comm_id'] = self._model_id
             self.comm = Comm(**args)
 
     def _comm_changed(self, name, new):
         """Called when the comm is changed."""
         if new is None:
             return
         self._model_id = self.model_id
         
         self.comm.on_msg(self._handle_msg)
         Widget.widgets[self.model_id] = self
         
         # first update
         self.send_state()
 
     @property
     def model_id(self):
         """Gets the model id of this widget.
 
         If a Comm doesn't exist yet, a Comm will be created automagically."""
         return self.comm.comm_id
 
     #-------------------------------------------------------------------------
     # Methods
     #-------------------------------------------------------------------------
 
     def close(self):
         """Close method.
 
         Closes the underlying comm.
         When the comm is closed, all of the widget views are automatically
         removed from the front-end."""
         if self.comm is not None:
             Widget.widgets.pop(self.model_id, None)
             self.comm.close()
             self.comm = None
     
     def send_state(self, key=None):
         """Sends the widget state, or a piece of it, to the front-end.
 
         Parameters
         ----------
         key : unicode, or iterable (optional)
             A single property's name or iterable of property names to sync with the front-end.
         """
-        self._send({
-            "method" : "update",
-            "state"  : self.get_state(key=key)
-        })
+        state, buffer_keys, buffers, metadata = self.get_state(key=key)
+        msg = {"method": "update", "state": state}
+        if buffer_keys:
+            msg['buffers'] = buffer_keys
+        if metadata:
+            msg['metadata'] = metadata
+        self._send(msg, buffers=buffers)
 
     def get_state(self, key=None):
         """Gets the widget state, or a piece of it.
 
         Parameters
         ----------
         key : unicode or iterable (optional)
             A single property's name or iterable of property names to get.
+
+        Returns
+        -------
+        state : dict of states
+        buffer_keys : list of strings
+            the values that are stored in buffers
+        buffers : list of binary memoryviews
+            values to transmit in binary
+        metadata : dict
+            metadata for each field: {key: metadata}
         """
         if key is None:
             keys = self.keys
         elif isinstance(key, string_types):
             keys = [key]
         elif isinstance(key, collections.Iterable):
             keys = key
         else:
             raise ValueError("key must be a string, an iterable of keys, or None")
         state = {}
+        buffers = []
+        buffer_keys = []
+        metadata = {}
         for k in keys:
             f = self.trait_metadata(k, 'to_json', self._trait_to_json)
             value = getattr(self, k)
-            state[k] = f(value)
-        return state
+            serialized, md = f(value)
+            if isinstance(serialized, memoryview):
+                buffers.append(serialized)
+                buffer_keys.append(k)
+            else:
+                state[k] = serialized
+            if md is not None:
+                metadata[k] = md
+        return state, buffer_keys, buffers, metadata
 
     def set_state(self, sync_data):
         """Called when a state is received from the front-end."""
         for name in self.keys:
             if name in sync_data:
                 json_value = sync_data[name]
                 from_json = self.trait_metadata(name, 'from_json', self._trait_from_json)
                 with self._lock_property(name, json_value):
                     setattr(self, name, from_json(json_value))
     
-    def send(self, content):
+    def send(self, content, buffers=None):
         """Sends a custom msg to the widget model in the front-end.
 
         Parameters
         ----------
         content : dict
             Content of the message to send.
+        buffers : list of binary buffers
+            Binary buffers to send with message
         """
-        self._send({"method": "custom", "content": content})
+        self._send({"method": "custom", "content": content}, buffers=buffers)
 
     def on_msg(self, callback, remove=False):
         """(Un)Register a custom msg receive callback.
 
         Parameters
         ----------
         callback: callable
-            callback will be passed two arguments when a message arrives::
+            callback will be passed three arguments when a message arrives::
             
-                callback(widget, content)
+                callback(widget, content, buffers)
             
         remove: bool
             True if the callback should be unregistered."""
         self._msg_callbacks.register_callback(callback, remove=remove)
 
     def on_displayed(self, callback, remove=False):
         """(Un)Register a widget displayed callback.
 
         Parameters
         ----------
         callback: method handler
             Must have a signature of::
             
                 callback(widget, **kwargs)
             
             kwargs from display are passed through without modification.
         remove: bool
             True if the callback should be unregistered."""
         self._display_callbacks.register_callback(callback, remove=remove)
 
     #-------------------------------------------------------------------------
     # Support methods
     #-------------------------------------------------------------------------
     @contextmanager
     def _lock_property(self, key, value):
         """Lock a property-value pair.
 
         The value should be the JSON state of the property.
 
         NOTE: This, in addition to the single lock for all state changes, is 
         flawed.  In the future we may want to look into buffering state changes 
         back to the front-end."""
         self._property_lock = (key, value)
         try:
             yield
         finally:
             self._property_lock = (None, None)
 
     @contextmanager
     def hold_sync(self):
         """Hold syncing any state until the context manager is released"""
         # We increment a value so that this can be nested.  Syncing will happen when
         # all levels have been released.
         self._send_state_lock += 1
         try:
             yield
         finally:
             self._send_state_lock -=1
             if self._send_state_lock == 0:
                 self.send_state(self._states_to_send)
                 self._states_to_send.clear()
 
     def _should_send_property(self, key, value):
         """Check the property lock (property_lock)"""
         to_json = self.trait_metadata(key, 'to_json', self._trait_to_json)
         if (key == self._property_lock[0]
             and to_json(value) == self._property_lock[1]):
             return False
         elif self._send_state_lock > 0:
             self._states_to_send.add(key)
             return False
         else:
             return True
     
     # Event handlers
     @_show_traceback
     def _handle_msg(self, msg):
         """Called when a msg is received from the front-end"""
         data = msg['content']['data']
         method = data['method']
 
         # Handle backbone sync methods CREATE, PATCH, and UPDATE all in one.
         if method == 'backbone':
             if 'sync_data' in data:
+                # get binary buffers too
                 sync_data = data['sync_data']
+                for i,k in enumerate(data.get('buffer_keys', [])):
+                    sync_data[k] = msg['buffers'][i]
                 self.set_state(sync_data) # handles all methods
 
         # Handle a state request.
         elif method == 'request_state':
             self.send_state()
 
         # Handle a custom msg from the front-end.
         elif method == 'custom':
             if 'content' in data:
-                self._handle_custom_msg(data['content'])
+                self._handle_custom_msg(data['content'], msg['buffers'])
 
         # Catch remainder.
         else:
             self.log.error('Unknown front-end to back-end widget msg with method "%s"' % method)
 
-    def _handle_custom_msg(self, content):
+    def _handle_custom_msg(self, content, buffers):
         """Called when a custom msg is received."""
-        self._msg_callbacks(self, content)
+        self._msg_callbacks(self, content, buffers)
 
     def _notify_trait(self, name, old_value, new_value):
         """Called when a property has been changed."""
         # Trigger default traitlet callback machinery.  This allows any user
         # registered validation to be processed prior to allowing the widget
         # machinery to handle the state.
         LoggingConfigurable._notify_trait(self, name, old_value, new_value)
 
         # Send the state after the user registered callbacks for trait changes
         # have all fired (allows for user to validate values).
         if self.comm is not None and name in self.keys:
             # Make sure this isn't information that the front-end just sent us.
             if self._should_send_property(name, new_value):
                 # Send new state to front-end
                 self.send_state(key=name)
 
     def _handle_displayed(self, **kwargs):
         """Called when a view has been displayed for this widget instance"""
         self._display_callbacks(self, **kwargs)
 
     def _trait_to_json(self, x):
         """Convert a trait value to json
 
         Traverse lists/tuples and dicts and serialize their values as well.
         Replace any widgets with their model_id
         """
-        if isinstance(x, dict):
-            return {k: self._trait_to_json(v) for k, v in x.items()}
-        elif isinstance(x, (list, tuple)):
-            return [self._trait_to_json(v) for v in x]
-        elif isinstance(x, Widget):
-            return "IPY_MODEL_" + x.model_id
-        else:
-            return x # Value must be JSON-able
+        return x, None
 
     def _trait_from_json(self, x):
         """Convert json values to objects
 
         Replace any strings representing valid model id values to Widget references.
         """
-        if isinstance(x, dict):
-            return {k: self._trait_from_json(v) for k, v in x.items()}
-        elif isinstance(x, (list, tuple)):
-            return [self._trait_from_json(v) for v in x]
-        elif isinstance(x, string_types) and x.startswith('IPY_MODEL_') and x[10:] in Widget.widgets:
-            # we want to support having child widgets at any level in a hierarchy
-            # trusting that a widget UUID will not appear out in the wild
-            return Widget.widgets[x[10:]]
-        else:
-            return x
+        return x
 
     def _ipython_display_(self, **kwargs):
         """Called when `IPython.display.display` is called on the widget."""
         # Show view.
         if self._view_name is not None:
             self._send({"method": "display"})
             self._handle_displayed(**kwargs)
 
-    def _send(self, msg):
+    def _send(self, msg, buffers=None):
         """Sends a message to the model in the front-end."""
-        self.comm.send(msg)
+        self.comm.send(data=msg, buffers=buffers)
 
 
 class DOMWidget(Widget):
     visible = Bool(True, allow_none=True, help="Whether the widget is visible.  False collapses the empty space, while None preserves the empty space.", sync=True)
     _css = Tuple(sync=True, help="CSS property list: (selector, key, value)")
     _dom_classes = Tuple(sync=True, help="DOM classes applied to widget.$el.")
     
     width = CUnicode(sync=True)
     height = CUnicode(sync=True)
     # A default padding of 2.5 px makes the widgets look nice when displayed inline.
     padding = CUnicode(sync=True)
     margin = CUnicode(sync=True)
 
     color = Color(None, allow_none=True, sync=True)
     background_color = Color(None, allow_none=True, sync=True)
     border_color = Color(None, allow_none=True, sync=True)
 
     border_width = CUnicode(sync=True)
     border_radius = CUnicode(sync=True)
     border_style = CaselessStrEnum(values=[ # http://www.w3schools.com/cssref/pr_border-style.asp
         'none', 
         'hidden', 
         'dotted', 
         'dashed', 
         'solid', 
         'double', 
         'groove', 
         'ridge', 
         'inset', 
         'outset', 
         'initial', 
         'inherit', ''],
         default_value='', sync=True)
 
     font_style = CaselessStrEnum(values=[ # http://www.w3schools.com/cssref/pr_font_font-style.asp
         'normal', 
         'italic', 
         'oblique', 
         'initial', 
         'inherit', ''], 
         default_value='', sync=True)
     font_weight = CaselessStrEnum(values=[ # http://www.w3schools.com/cssref/pr_font_weight.asp
         'normal', 
         'bold', 
         'bolder', 
         'lighter',
         'initial', 
         'inherit', ''] + list(map(str, range(100,1000,100))),
         default_value='', sync=True)
     font_size = CUnicode(sync=True)
     font_family = Unicode(sync=True)
 
     def __init__(self, *pargs, **kwargs):
         super(DOMWidget, self).__init__(*pargs, **kwargs)
 
         def _validate_border(name, old, new):
             if new is not None and new != '':
                 if name != 'border_width' and not self.border_width:
                     self.border_width = 1
                 if name != 'border_style' and self.border_style == '':
                     self.border_style = 'solid'
         self.on_trait_change(_validate_border, ['border_width', 'border_style', 'border_color'])

IPython/html/widgets/widget_box.py

@@ -1,80 +1,82 b''
 """Box class.  
 
 Represents a container that can be used to group other widgets.
 """
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-from .widget import DOMWidget, register
+from .widget import DOMWidget, register, widget_serialization
 from IPython.utils.traitlets import Unicode, Tuple, TraitError, Int, CaselessStrEnum
 from IPython.utils.warn import DeprecatedClass
 
 @register('IPython.Box')
 class Box(DOMWidget):
     """Displays multiple widgets in a group."""
     _view_name = Unicode('BoxView', sync=True)
 
     # Child widgets in the container.
     # Using a tuple here to force reassignment to update the list.
     # When a proper notifying-list trait exists, that is what should be used here.
-    children = Tuple(sync=True)
+    # TODO: make this tuple serialize models
+    # TODO: enforce that tuples here have a single datatype
+    children = Tuple(sync=True, **widget_serialization)
     
     _overflow_values = ['visible', 'hidden', 'scroll', 'auto', 'initial', 'inherit', '']
     overflow_x = CaselessStrEnum(
         values=_overflow_values, 
         default_value='', sync=True, help="""Specifies what
         happens to content that is too large for the rendered region.""")
     overflow_y = CaselessStrEnum(
         values=_overflow_values, 
         default_value='', sync=True, help="""Specifies what
         happens to content that is too large for the rendered region.""")
 
     box_style = CaselessStrEnum(
         values=['success', 'info', 'warning', 'danger', ''], 
         default_value='', allow_none=True, sync=True, help="""Use a
         predefined styling for the box.""")
 
     def __init__(self, children = (), **kwargs):
         kwargs['children'] = children
         super(Box, self).__init__(**kwargs)
         self.on_displayed(Box._fire_children_displayed)
 
     def _fire_children_displayed(self):
         for child in self.children:
             child._handle_displayed()
 
 
 @register('IPython.FlexBox')
 class FlexBox(Box):
     """Displays multiple widgets using the flexible box model."""
     _view_name = Unicode('FlexBoxView', sync=True)
     orientation = CaselessStrEnum(values=['vertical', 'horizontal'], default_value='vertical', sync=True)
     flex = Int(0, sync=True, help="""Specify the flexible-ness of the model.""")
     def _flex_changed(self, name, old, new):
         new = min(max(0, new), 2)
         if self.flex != new:
             self.flex = new
 
     _locations = ['start', 'center', 'end', 'baseline', 'stretch']
     pack = CaselessStrEnum(
         values=_locations, 
         default_value='start', sync=True)
     align = CaselessStrEnum(
         values=_locations, 
         default_value='start', sync=True)
 
 
 def VBox(*pargs, **kwargs):
     """Displays multiple widgets vertically using the flexible box model."""
     kwargs['orientation'] = 'vertical'
     return FlexBox(*pargs, **kwargs)
 
 def HBox(*pargs, **kwargs):
     """Displays multiple widgets horizontally using the flexible box model."""
     kwargs['orientation'] = 'horizontal'
     return FlexBox(*pargs, **kwargs)
 
 
 # Remove in IPython 4.0
 ContainerWidget = DeprecatedClass(Box, 'ContainerWidget')

IPython/html/widgets/widget_button.py

@@ -1,82 +1,82 b''
 """Button class.  
 
 Represents a button in the frontend using a widget.  Allows user to listen for
 click events on the button and trigger backend code when the clicks are fired.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from .widget import DOMWidget, CallbackDispatcher, register
 from IPython.utils.traitlets import Unicode, Bool, CaselessStrEnum
 from IPython.utils.warn import DeprecatedClass
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 @register('IPython.Button')
 class Button(DOMWidget):
     """Button widget.
        This widget has an `on_click` method that allows you to listen for the 
        user clicking on the button.  The click event itself is stateless.
 
        Parameters
        ----------
        description : str
            description displayed next to the button
        tooltip: str
            tooltip caption of the toggle button
        icon: str
            font-awesome icon name
     """
     _view_name = Unicode('ButtonView', sync=True)
 
     # Keys
     description = Unicode('', help="Button label.", sync=True)
     tooltip = Unicode(help="Tooltip caption of the button.", sync=True)
     disabled = Bool(False, help="Enable or disable user changes.", sync=True)
     icon = Unicode('', help= "Font-awesome icon.", sync=True)
 
     button_style = CaselessStrEnum(
         values=['primary', 'success', 'info', 'warning', 'danger', ''], 
         default_value='', allow_none=True, sync=True, help="""Use a
         predefined styling for the button.""")
     
     def __init__(self, **kwargs):
         """Constructor"""
         super(Button, self).__init__(**kwargs)
         self._click_handlers = CallbackDispatcher()
         self.on_msg(self._handle_button_msg)
 
     def on_click(self, callback, remove=False):
         """Register a callback to execute when the button is clicked.
 
         The callback will be called with one argument,
         the clicked button widget instance.
 
         Parameters
         ----------
         remove : bool (optional)
             Set to true to remove the callback from the list of callbacks."""
         self._click_handlers.register_callback(callback, remove=remove)
 
-    def _handle_button_msg(self, _, content):
+    def _handle_button_msg(self, _, content, buffers):
         """Handle a msg from the front-end.
 
         Parameters
         ----------
         content: dict
             Content of the msg."""
         if content.get('event', '') == 'click':
             self._click_handlers(self)
 
 
 # Remove in IPython 4.0
 ButtonWidget = DeprecatedClass(Button, 'ButtonWidget')