Delete unnecessary save

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

@@ -1,393 +1,392
 //----------------------------------------------------------------------------
 //  Copyright (C) 2013 The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // Base Widget Model and View classes
 //============================================================================
 
 /**
  * @module IPython
  * @namespace IPython
  **/
 
 define(["notebook/js/widgetmanager",
         "underscore",
         "backbone"], 
 function(widget_manager, underscore, backbone){
 
     var WidgetModel = Backbone.Model.extend({
         constructor: function (widget_manager, model_id, comm) {
             // Construcctor
             //
             // 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.pending_msgs = 0;
             this.msg_throttle = 2;
             this.msg_buffer = null;
             this.key_value_lock = null;
             this.id = model_id;
             this.views = [];
 
             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));
             }
             return Backbone.Model.apply(this);
         },
 
         send: function (content, callbacks) {
             // Send a custom msg over the comm.
             if (this.comm !== undefined) {
                 var data = {method: 'custom', custom_content: content};
                 this.comm.send(data, callbacks);
             }
         },
 
         _handle_comm_closed: function (msg) {
             // Handle when a widget is closed.
             this.trigger('comm:close');
             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.
             // TODO: Handle deletion, like this.destroy(), and delete views, etc.
         },
 
         _handle_comm_msg: function (msg) {
             // Handle incoming comm msg.
             var method = msg.content.data.method;
             switch (method) {
                 case 'update':
                     this.apply_update(msg.content.data.state);
                     break;
                 case 'custom':
                     this.trigger('msg:custom', msg.content.data.custom_content);
                     break;
                 case 'display':
                     this.widget_manager.display_view(msg, this);
                     break;
             }
         },
 
         apply_update: function (state) {
             // Handle when a widget is updated via the python side.
             for (var key in state) {
                 if (state.hasOwnProperty(key)) {
                     var value = state[key];
                     this.key_value_lock = [key, value];
                     try {
                         this.set(key, this._unpack_models(value));
                     } finally {
                         this.key_value_lock = null;
                     }
                 }
             }
-            //TODO: are there callbacks that make sense in this case?  If so, attach them here as an option
-            this.save();
+            //TODO: are there callbacks that make sense in this case?  If so, attach them here as an option 
         },
 
         _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.msg_throttle === 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;
                     }
                 }
             }
         },
 
         _handle_sync: function (method, options) {
             // Custom syncronization logic.
             var model_json = this.toJSON();
             var attr;
 
             // Only send updated state if the state hasn't been changed 
             // during an update.
             if (this.comm !== undefined) {    
                 if (this.pending_msgs >= this.msg_throttle) {
                     // 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.
                     if (this.msg_buffer === null) {
                         this.msg_buffer = $.extend({}, model_json); // Copy
                     }
                     for (attr in options.attrs) {
                         var value = this._pack_models(options.attrs[attr]);
                         if (this.key_value_lock === null || attr !== this.key_value_lock[0] || value !== this.key_value_lock[1]) {
                             this.msg_buffer[attr] = value;
                         }
                     }
 
                 } else {
                     // We haven't exceeded the throttle, send the message like 
                     // normal.  If this is a patch operation, just send the 
                     // changes.
                     var send_json = model_json;
                     send_json = {};
                     for (attr in options.attrs) {
                         var value = this._pack_models(options.attrs[attr]);
                         if (this.key_value_lock === null || attr !== this.key_value_lock[0] || value !== this.key_value_lock[1]) {
                             send_json[attr] = value;
                         }
                     }
                     
                     var is_empty = true;
                     for (var prop in send_json) if (send_json.hasOwnProperty(prop)) is_empty = false;
                     if (!is_empty) {
                         ++this.pending_msgs;
                         var data = {method: 'backbone', sync_data: send_json};
                         this.comm.send(data, options.callbacks);
                     }
                 }
             }
             
             // Since the comm is a one-way communication, assume the message 
             // arrived.
             return model_json;
         },
 
         push: function(callbacks) {
 			// Push this model's state to the back-end
 			//
 			// This invokes a Backbone.Sync.
             this.save(this.changedAttributes(), {patch: true, callbacks: callbacks});
         },
 
         _pack_models: function(value) {
             // Replace models with model ids recursively.
             if (value instanceof Backbone.Model) {
                 return value.id;
             } else if (value instanceof Object) {
                 var packed = {};
                 for (var key in value) {
                     packed[key] = this._pack_models(value[key]);
                 }
                 return packed;
             } else {
                 return value;
             }
         },
 
         _unpack_models: function(value) {
             // Replace model ids with models recursively.
             if (value instanceof Object) {
                 var unpacked = {};
                 for (var key in value) {
                     unpacked[key] = this._unpack_models(value[key]);
                 }
                 return unpacked;
             } else {
                 var model = this.widget_manager.get_model(value);
                 if (model !== null) {
                     return model;
                 } else {
                     return value;
                 }
             }
         },
 
     });
     widget_manager.register_widget_model('WidgetModel', WidgetModel);
 
 
     var WidgetView = Backbone.View.extend({
         initialize: function(parameters) {
             // Public constructor.
             this.model.on('change',this.update,this);
             this.options = parameters.options;
             this.child_views = [];
             this.model.views.push(this);
         },
 
         update: function(){
             // Triggered on model change.
             //
             // Update view to be consistent with this.model
         },
 
         create_child_view: function(child_model, options) {
             // Create and return a child view.
             //
             // -given a model and (optionally) a view name if the view name is 
             // not given, it defaults to the model's default view attribute.
 	    
             // TODO: this is hacky, and makes the view depend on this cell attribute and widget manager behavior
 	        // it would be great to have the widget manager add the cell metadata
 	        // to the subview without having to add it here.
 	        options = options || {};
             options.cell = this.options.cell;
             var child_view = this.model.widget_manager.create_view(child_model, options);
             this.child_views[child_model.id] = child_view;
             return child_view;
         },
 
         delete_child_view: function(child_model, options) {
             // Delete a child view that was previously created using create_child_view.
             var view = this.child_views[child_model.id];
             delete this.child_views[child_model.id];
             view.remove();
         },
 
         do_diff: function(old_list, new_list, removed_callback, added_callback) {
             // Difference a changed list and call remove and add callbacks for 
             // each removed and added item in the new list.
             //
             // Parameters
             // ----------
             // old_list : array
             // new_list : array
             // removed_callback : Callback(item)
             //      Callback that is called for each item removed.
             // added_callback : Callback(item)
             //      Callback that is called for each item added.
 
 
             // removed items
             _.each(_.difference(old_list, new_list), function(item, index, list) {
                 removed_callback(item);
             }, this);
 
             // added items
             _.each(_.difference(new_list, old_list), function(item, index, list) {
                 added_callback(item);
             }, this);
         },
 
         callbacks: function(){
             // Create msg callbacks for a comm msg.
             return this.model.widget_manager.callbacks(this);
         },
 
         render: function(){
             // Render the view.
             //
             // By default, this is only called the first time the view is created
         },
 
         send: function (content) {
             // Send a custom msg associated with this view.
             this.model.send(content, this.callbacks());
         },
 
         touch: function () {
             this.model.push(this.callbacks());
         },
 
     });
 
 
     var DOMWidgetView = WidgetView.extend({
         initialize: function (options) {
             // Public constructor
 
             // In the future we may want to make changes more granular 
             // (e.g., trigger on visible:change).
             this.model.on('change', this.update, this);
             this.model.on('msg:custom', this.on_msg, this);
             DOMWidgetView.__super__.initialize.apply(this, arguments);
         },
         
         on_msg: function(msg) {
             // Handle DOM specific msgs.
             switch(msg.msg_type) {
                 case 'add_class':
                     this.add_class(msg.selector, msg.class_list);
                     break;
                 case 'remove_class':
                     this.remove_class(msg.selector, msg.class_list);
                     break;
             }
         },
 
         add_class: function (selector, class_list) {
             // Add a DOM class to an element.
             this._get_selector_element(selector).addClass(class_list);
         },
         
         remove_class: function (selector, class_list) {
             // Remove a DOM class from an element.
             this._get_selector_element(selector).removeClass(class_list);
         },
     
         update: function () {
             // Update the contents of this view
             //
             // Called when the model is changed.  The model may have been 
             // changed by another view or by a state update from the back-end.
             //      The very first update seems to happen before the element is 
             // finished rendering so we use setTimeout to give the element time 
             // to render
             var e = this.$el;
             var visible = this.model.get('visible');
             setTimeout(function() {e.toggle(visible)},0);
      
             var css = this.model.get('_css');
             if (css === undefined) {return;}
             for (var selector in css) {
                 if (css.hasOwnProperty(selector)) {
                     // Apply the css traits to all elements that match the selector.
                     var elements = this._get_selector_element(selector);
                     if (elements.length > 0) {
                         var css_traits = css[selector];    
                         for (var css_key in css_traits) {
                             if (css_traits.hasOwnProperty(css_key)) {
                                 elements.css(css_key, css_traits[css_key]);
                             }
                         }
                     }
                 }
             }
         },
 
         _get_selector_element: function (selector) {
             // Get the elements via the css selector.  
 
             // If the selector is blank, apply the style to the $el_to_style 
             // element.  If the $el_to_style element is not defined, use apply 
             // the style to the view's element.
             var elements;
             if (selector === undefined || selector === null || selector === '') {
                 if (this.$el_to_style === undefined) {
                     elements = this.$el;
                 } else {
                     elements = this.$el_to_style;
                 }
             } else {
                 elements = this.$el.find(selector);
             }
             return elements;
         },
     });
 
     IPython.WidgetModel = WidgetModel;
     IPython.WidgetView = WidgetView;
     IPython.DOMWidgetView = DOMWidgetView;
 
     // Pass through widget_manager instance (probably not a good practice).
     return widget_manager;
 });