|
|
//----------------------------------------------------------------------------
|
|
|
// 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){
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// WidgetModel class
|
|
|
//--------------------------------------------------------------------
|
|
|
var WidgetModel = Backbone.Model.extend({
|
|
|
constructor: function (widget_manager, widget_id, comm) {
|
|
|
this.widget_manager = widget_manager;
|
|
|
this.pending_msgs = 0;
|
|
|
this.msg_throttle = 3;
|
|
|
this.msg_buffer = null;
|
|
|
this.id = widget_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) {
|
|
|
if (this.comm !== undefined) {
|
|
|
var data = {method: 'custom', custom_content: content};
|
|
|
this.comm.send(data, callbacks);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
// Handle when a widget is closed.
|
|
|
_handle_comm_closed: function (msg) {
|
|
|
this.trigger('comm:close');
|
|
|
delete this.comm.model; // Delete ref so GC will collect widget model.
|
|
|
delete this.comm;
|
|
|
delete this.widget_id; // Delete id from model so widget manager cleans up.
|
|
|
// TODO: Handle deletion, like this.destroy(), and delete views, etc.
|
|
|
},
|
|
|
|
|
|
|
|
|
// Handle incoming comm msg.
|
|
|
_handle_comm_msg: function (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;
|
|
|
default:
|
|
|
// pass on to widget manager
|
|
|
this.widget_manager.handle_msg(msg, this);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
|
|
|
// Handle when a widget is updated via the python side.
|
|
|
apply_update: function (state) {
|
|
|
this.updating = true;
|
|
|
try {
|
|
|
for (var key in state) {
|
|
|
if (state.hasOwnProperty(key)) {
|
|
|
this.set(key, state[key]);
|
|
|
}
|
|
|
}
|
|
|
//TODO: are there callbacks that make sense in this case? If so, attach them here as an option
|
|
|
this.save();
|
|
|
} finally {
|
|
|
this.updating = false;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
|
|
|
_handle_status: function (msg, callbacks) {
|
|
|
//execution_state : ('busy', 'idle', 'starting')
|
|
|
if (this.comm !== undefined && 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 {
|
|
|
// Only decrease the pending message count if the buffer
|
|
|
// doesn't get flushed (sent).
|
|
|
--this.pending_msgs;
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
|
|
|
|
|
|
// Custom syncronization logic.
|
|
|
_handle_sync: function (method, options) {
|
|
|
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.updating) {
|
|
|
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 (method=='patch') {
|
|
|
if (this.msg_buffer === null) {
|
|
|
this.msg_buffer = $.extend({}, model_json); // Copy
|
|
|
}
|
|
|
for (attr in options.attrs) {
|
|
|
this.msg_buffer[attr] = options.attrs[attr];
|
|
|
}
|
|
|
} else {
|
|
|
this.msg_buffer = $.extend({}, model_json); // Copy
|
|
|
}
|
|
|
|
|
|
} 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;
|
|
|
if (method =='patch') {
|
|
|
send_json = {};
|
|
|
for (attr in options.attrs) {
|
|
|
send_json[attr] = options.attrs[attr];
|
|
|
}
|
|
|
}
|
|
|
|
|
|
var data = {method: 'backbone', sync_method: method, sync_data: send_json};
|
|
|
this.comm.send(data, options.callbacks);
|
|
|
this.pending_msgs++;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Since the comm is a one-way communication, assume the message
|
|
|
// arrived.
|
|
|
return model_json;
|
|
|
},
|
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// WidgetView class
|
|
|
//--------------------------------------------------------------------
|
|
|
var BaseWidgetView = Backbone.View.extend({
|
|
|
initialize: function(options) {
|
|
|
this.model.on('change',this.update,this);
|
|
|
this.widget_manager = options.widget_manager;
|
|
|
this.comm_manager = options.widget_manager.comm_manager;
|
|
|
this.cell = options.cell;
|
|
|
this.child_views = [];
|
|
|
},
|
|
|
|
|
|
update: function(){
|
|
|
// update view to be consistent with this.model
|
|
|
// triggered on model change
|
|
|
},
|
|
|
|
|
|
child_view: function(comm_id, view_name) {
|
|
|
// create and return a child view, given a comm id for a model and (optionally) a view name
|
|
|
// if the view name is not given, it defaults to the model's default view attribute
|
|
|
var child_model = this.comm_manager.comms[comm_id].model;
|
|
|
var child_view = this.widget_manager.create_view(child_model, view_name, this.cell);
|
|
|
this.child_views.push(child_view);
|
|
|
return child_view;
|
|
|
},
|
|
|
|
|
|
render: function(){
|
|
|
// render the view. By default, this is only called the first time the view is created
|
|
|
},
|
|
|
send: function (content) {
|
|
|
this.model.send(content, this._callbacks());
|
|
|
},
|
|
|
|
|
|
touch: function () {
|
|
|
this.model.save(this.model.changedAttributes(), {patch: true, callbacks: this._callbacks()});
|
|
|
},
|
|
|
|
|
|
_callbacks: function () {
|
|
|
// callback handlers specific to this view's cell
|
|
|
var callbacks = {};
|
|
|
var cell = this.cell;
|
|
|
if (cell !== null) {
|
|
|
// Try to get output handlers
|
|
|
var handle_output = null;
|
|
|
var handle_clear_output = null;
|
|
|
if (cell.output_area !== undefined && cell.output_area !== null) {
|
|
|
handle_output = $.proxy(cell.output_area.handle_output, cell.output_area);
|
|
|
handle_clear_output = $.proxy(cell.output_area.handle_clear_output, cell.output_area);
|
|
|
}
|
|
|
|
|
|
// Create callback dict using what is known
|
|
|
var that = this;
|
|
|
callbacks = {
|
|
|
iopub : {
|
|
|
output : handle_output,
|
|
|
clear_output : handle_clear_output,
|
|
|
|
|
|
status : function (msg) {
|
|
|
that.model._handle_status(msg, that._callbacks());
|
|
|
},
|
|
|
|
|
|
// Special function only registered by widget messages.
|
|
|
// Allows us to get the cell for a message so we know
|
|
|
// where to add widgets if the code requires it.
|
|
|
get_cell : function () {
|
|
|
return cell;
|
|
|
},
|
|
|
},
|
|
|
};
|
|
|
}
|
|
|
return callbacks;
|
|
|
},
|
|
|
|
|
|
});
|
|
|
|
|
|
var WidgetView = BaseWidgetView.extend({
|
|
|
initialize: function (options) {
|
|
|
// TODO: make changes more granular (e.g., trigger on visible:change)
|
|
|
this.model.on('change', this.update, this);
|
|
|
this.model.on('msg:custom', this.on_msg, this);
|
|
|
BaseWidgetView.prototype.initialize.apply(this, arguments);
|
|
|
},
|
|
|
|
|
|
on_msg: function(msg) {
|
|
|
switch(msg.msg_type) {
|
|
|
case 'add_class':
|
|
|
this.add_class(msg.selector, msg.class_list);
|
|
|
break;
|
|
|
case 'remove_class':
|
|
|
this.remove_class(msg.selector, msg.class_list);
|
|
|
break;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
add_class: function (selector, class_list) {
|
|
|
var elements = this._get_selector_element(selector);
|
|
|
if (elements.length > 0) {
|
|
|
elements.addClass(class_list);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
remove_class: function (selector, class_list) {
|
|
|
var elements = this._get_selector_element(selector);
|
|
|
if (elements.length > 0) {
|
|
|
elements.removeClass(class_list);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
update: function () {
|
|
|
// the very first update seems to happen before the element is finished rendering
|
|
|
// so we use setTimeout to give the element time to render
|
|
|
var e = this.$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.BaseWidgetView = BaseWidgetView;
|
|
|
|
|
|
return widget_manager;
|
|
|
});
|
|
|
|