|
|
//----------------------------------------------------------------------------
|
|
|
// 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(["widgets/js/manager",
|
|
|
"underscore",
|
|
|
"backbone"],
|
|
|
function(WidgetManager, _, Backbone){
|
|
|
|
|
|
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._buffered_state_diff = {};
|
|
|
this.pending_msgs = 0;
|
|
|
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', content: content};
|
|
|
this.comm.send(data, callbacks);
|
|
|
this.pending_msgs++;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
_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.
|
|
|
_.each(this.views, function(view, i) {
|
|
|
view.remove();
|
|
|
});
|
|
|
},
|
|
|
|
|
|
_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.content);
|
|
|
break;
|
|
|
case 'display':
|
|
|
this.widget_manager.display_view(msg, this);
|
|
|
this.trigger('displayed');
|
|
|
break;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
apply_update: function (state) {
|
|
|
// Handle when a widget is updated via the python side.
|
|
|
var that = this;
|
|
|
_.each(state, function(value, key) {
|
|
|
that.key_value_lock = [key, value];
|
|
|
try {
|
|
|
WidgetModel.__super__.set.apply(that, [key, that._unpack_models(value)]);
|
|
|
} finally {
|
|
|
that.key_value_lock = null;
|
|
|
}
|
|
|
});
|
|
|
},
|
|
|
|
|
|
_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.
|
|
|
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);
|
|
|
if (this.key_value_lock !== null) {
|
|
|
var key = this.key_value_lock[0];
|
|
|
var value = this.key_value_lock[1];
|
|
|
if (attrs[key] === value) {
|
|
|
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 = $.extend(this.msg_buffer || {}, attrs);
|
|
|
break;
|
|
|
case 'update':
|
|
|
case 'create':
|
|
|
this.msg_buffer = attrs;
|
|
|
break;
|
|
|
default:
|
|
|
error();
|
|
|
return false;
|
|
|
}
|
|
|
this.msg_buffer_callbacks = callbacks;
|
|
|
|
|
|
} else {
|
|
|
// We haven't exceeded the throttle, send the message like
|
|
|
// normal.
|
|
|
var data = {method: 'backbone', sync_data: attrs};
|
|
|
this.comm.send(data, callbacks);
|
|
|
this.pending_msgs++;
|
|
|
}
|
|
|
}
|
|
|
// Since the comm is a one-way communication, assume the message
|
|
|
// arrived. Don't call success since we don't have a model back from the server
|
|
|
// this means we miss out on the 'sync' event.
|
|
|
this._buffered_state_diff = {};
|
|
|
},
|
|
|
|
|
|
save_changes: function(callbacks) {
|
|
|
// Push this model's state to the back-end
|
|
|
//
|
|
|
// This invokes a Backbone.Sync.
|
|
|
this.save(this._buffered_state_diff, {patch: true, callbacks: callbacks});
|
|
|
},
|
|
|
|
|
|
_pack_models: function(value) {
|
|
|
// Replace models with model ids recursively.
|
|
|
if (value instanceof Backbone.Model) {
|
|
|
return value.id;
|
|
|
|
|
|
} else if ($.isArray(value)) {
|
|
|
var packed = [];
|
|
|
var that = this;
|
|
|
_.each(value, function(sub_value, key) {
|
|
|
packed.push(that._pack_models(sub_value));
|
|
|
});
|
|
|
return packed;
|
|
|
|
|
|
} else if (value instanceof Object) {
|
|
|
var packed = {};
|
|
|
var that = this;
|
|
|
_.each(value, function(sub_value, key) {
|
|
|
packed[key] = that._pack_models(sub_value);
|
|
|
});
|
|
|
return packed;
|
|
|
|
|
|
} else {
|
|
|
return value;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
_unpack_models: function(value) {
|
|
|
// Replace model ids with models recursively.
|
|
|
if ($.isArray(value)) {
|
|
|
var unpacked = [];
|
|
|
var that = this;
|
|
|
_.each(value, function(sub_value, key) {
|
|
|
unpacked.push(that._unpack_models(sub_value));
|
|
|
});
|
|
|
return unpacked;
|
|
|
|
|
|
} else if (value instanceof Object) {
|
|
|
var unpacked = {};
|
|
|
var that = this;
|
|
|
_.each(value, function(sub_value, key) {
|
|
|
unpacked[key] = that._unpack_models(sub_value);
|
|
|
});
|
|
|
return unpacked;
|
|
|
|
|
|
} else {
|
|
|
var model = this.widget_manager.get_model(value);
|
|
|
if (model) {
|
|
|
return model;
|
|
|
} else {
|
|
|
return value;
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
|
|
|
});
|
|
|
WidgetManager.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.
|
|
|
var child_view = this.model.widget_manager.create_view(child_model, options || {}, this);
|
|
|
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];
|
|
|
if (view !== undefined) {
|
|
|
delete this.child_views[child_model.id];
|
|
|
view.remove();
|
|
|
child_model.views.pop(view);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
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.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.save_changes(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 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);
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
|
|
|
_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 $el_to_style element is not defined, use apply
|
|
|
// the style to the view's element.
|
|
|
var elements;
|
|
|
if (!selector) {
|
|
|
if (this.$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 WidgetManager namespace.
|
|
|
return WidgetManager;
|
|
|
});
|
|
|
|
