widget.js
485 lines
| 18.3 KiB
| application/javascript
|
JavascriptLexer
|
r14224 | //---------------------------------------------------------------------------- | ||
// 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. | ||||
//---------------------------------------------------------------------------- | ||||
//============================================================================ | ||||
// WidgetModel, WidgetView, and WidgetManager | ||||
//============================================================================ | ||||
/** | ||||
* Base Widget classes | ||||
* @module IPython | ||||
* @namespace IPython | ||||
* @submodule widget | ||||
*/ | ||||
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r14237 | "use strict"; | ||
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r14263 | // Use require.js 'define' method so that require.js is intelligent enough to | ||
// syncronously load everything within this file when it is being 'required' | ||||
// elsewhere. | ||||
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r14285 | define(["components/underscore/underscore-min", | ||
"components/backbone/backbone-min", | ||||
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r14263 | ], function(){ | ||
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r14342 | |||
//-------------------------------------------------------------------- | ||||
// WidgetModel class | ||||
//-------------------------------------------------------------------- | ||||
var WidgetModel = Backbone.Model.extend({ | ||||
constructor: function(comm_manager, comm, widget_view_types) { | ||||
this.comm_manager = comm_manager; | ||||
this.widget_view_types = widget_view_types; | ||||
this.pending_msgs = 0; | ||||
this.msg_throttle = 3; | ||||
this.msg_buffer = null; | ||||
this.views = {}; | ||||
// 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); | ||||
}, | ||||
update_other_views: function(caller) { | ||||
this.last_modified_view = caller; | ||||
this.save(this.changedAttributes(), {patch: true}); | ||||
for (var output_area in this.views) { | ||||
var views = this.views[output_area]; | ||||
for (var view_index in views) { | ||||
var view = views[view_index]; | ||||
if (view !== caller) { | ||||
view.update(); | ||||
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r14263 | } | ||
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r14227 | } | ||
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r14342 | } | ||
}, | ||||
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r14278 | |||
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r14342 | |||
handle_status: function (output_area, msg) { | ||||
//execution_state : ('busy', 'idle', 'starting') | ||||
if (msg.content.execution_state=='idle') { | ||||
// Send buffer if this message caused another message to be | ||||
// throttled. | ||||
if (this.msg_buffer != null && | ||||
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r14346 | this.msg_throttle == this.pending_msgs) { | ||
var output_area = this._get_output_area(msg.parent_header.msg_id); | ||||
var callbacks = this._make_callbacks(output_area); | ||||
var data = {sync_method: 'update', sync_data: this.msg_buffer}; | ||||
this.comm.send(data, callbacks); | ||||
this.msg_buffer = null; | ||||
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r14342 | } else { | ||
// Only decrease the pending message count if the buffer | ||||
// doesn't get flushed (sent). | ||||
--this.pending_msgs; | ||||
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r14278 | } | ||
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r14342 | } | ||
}, | ||||
// Custom syncronization logic. | ||||
handle_sync: function (method, options) { | ||||
var model_json = this.toJSON(); | ||||
// Only send updated state if the state hasn't been changed | ||||
// during an update. | ||||
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) { | ||||
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r14278 | this.msg_buffer = $.extend({}, model_json); // Copy | ||
} | ||||
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r14342 | for (var attr in options.attrs) { | ||
this.msg_buffer[attr] = options.attrs[attr]; | ||||
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r14278 | } | ||
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r14342 | } else { | ||
this.msg_buffer = $.extend({}, model_json); // Copy | ||||
} | ||||
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r14278 | |||
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r14342 | } 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 (var attr in options.attrs) { | ||||
send_json[attr] = options.attrs[attr]; | ||||
} | ||||
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r14278 | } | ||
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r14342 | |||
var data = {sync_method: method, sync_data: send_json}; | ||||
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r14353 | |||
var output_area = null; | ||||
if (this.last_modified_view != undefined && this.last_modified_view != null) { | ||||
output_area = this.last_modified_view.output_area; | ||||
} | ||||
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r14342 | var callbacks = this._make_callbacks(output_area); | ||
this.comm.send(data, callbacks); | ||||
this.pending_msgs++; | ||||
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r14278 | } | ||
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r14342 | } | ||
// Since the comm is a one-way communication, assume the message | ||||
// arrived. | ||||
return model_json; | ||||
}, | ||||
// Handle incomming comm msg. | ||||
handle_comm_msg: function (msg) { | ||||
var method = msg.content.data.method; | ||||
switch (method){ | ||||
case 'display': | ||||
// Try to get the cell index. | ||||
var output_area = this._get_output_area(msg.parent_header.msg_id); | ||||
if (output_area == null) { | ||||
console.log("Could not determine where the display" + | ||||
" message was from. Widget will not be displayed") | ||||
} else { | ||||
this.display_view(msg.content.data.view_name, | ||||
msg.content.data.parent, | ||||
output_area); | ||||
} | ||||
break; | ||||
case 'update': | ||||
this.handle_update(msg.content.data.state); | ||||
break; | ||||
} | ||||
}, | ||||
// Handle when a widget is updated via the python side. | ||||
handle_update: function (state) { | ||||
this.updating = true; | ||||
try { | ||||
for (var key in state) { | ||||
if (state.hasOwnProperty(key)) { | ||||
if (key == "_css"){ | ||||
this.css = state[key]; | ||||
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r14316 | } else { | ||
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r14342 | this.set(key, state[key]); | ||
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r14278 | } | ||
} | ||||
} | ||||
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r14342 | this.id = this.comm.comm_id; | ||
this.save(); | ||||
} finally { | ||||
this.updating = false; | ||||
} | ||||
}, | ||||
// Handle when a widget is closed. | ||||
handle_comm_closed: function (msg) { | ||||
for (var output_area in this.views) { | ||||
var views = this.views[output_area]; | ||||
for (var view_index in views) { | ||||
var view = views[view_index]; | ||||
view.remove(); | ||||
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r14278 | } | ||
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r14342 | } | ||
}, | ||||
// Create view that represents the model. | ||||
display_view: function (view_name, parent_comm_id, output_area) { | ||||
var new_views = []; | ||||
var displayed = false; | ||||
if (parent_comm_id != undefined) { | ||||
var parent_comm = this.comm_manager.comms[parent_comm_id]; | ||||
var parent_model = parent_comm.model; | ||||
var parent_views = parent_model.views[output_area]; | ||||
for (var parent_view_index in parent_views) { | ||||
var parent_view = parent_views[parent_view_index]; | ||||
if (parent_view.display_child != undefined) { | ||||
var view = this._create_view(view_name, output_area); | ||||
new_views.push(view); | ||||
parent_view.display_child(view); | ||||
displayed = true; | ||||
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r14285 | } | ||
} | ||||
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r14342 | } | ||
if (!displayed) { | ||||
// No parent view is defined or exists. Add the view's | ||||
// element to cell's widget div. | ||||
var view = this._create_view(view_name, output_area); | ||||
new_views.push(view); | ||||
this._get_widget_area_element(output_area, true) | ||||
.append(view.$el); | ||||
} | ||||
for (var view_index in new_views) { | ||||
var view = new_views[view_index]; | ||||
view.update(); | ||||
} | ||||
}, | ||||
// Create a view | ||||
_create_view: function (view_name, output_area) { | ||||
var view = new this.widget_view_types[view_name]({model: this}); | ||||
view.render(); | ||||
if (this.views[output_area]==undefined) { | ||||
this.views[output_area] = [] | ||||
} | ||||
this.views[output_area].push(view); | ||||
view.output_area = output_area; | ||||
// Handle when the view element is remove from the page. | ||||
var that = this; | ||||
view.$el.on("remove", function(){ | ||||
var index = that.views[output_area].indexOf(view); | ||||
if (index > -1) { | ||||
that.views[output_area].splice(index, 1); | ||||
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r14285 | } | ||
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r14342 | view.remove(); // Clean-up view | ||
if (that.views[output_area].length()==0) { | ||||
delete that.views[output_area]; | ||||
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r14285 | } | ||
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r14342 | // Close the comm if there are no views left. | ||
if (that.views.length()==0) { | ||||
that.comm.close(); | ||||
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r14281 | } | ||
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r14342 | }); | ||
return view; | ||||
}, | ||||
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r14278 | |||
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r14342 | // Build a callback dict. | ||
_make_callbacks: function (output_area) { | ||||
var callbacks = {}; | ||||
if (output_area != null) { | ||||
var that = this; | ||||
callbacks = { | ||||
iopub : { | ||||
output : $.proxy(output_area.handle_output, output_area), | ||||
clear_output : $.proxy(output_area.handle_clear_output, output_area), | ||||
status : function(msg){ | ||||
that.handle_status(output_area, msg); | ||||
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r14278 | }, | ||
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r14342 | get_output_area : function() { | ||
if (that.last_modified_view != undefined && | ||||
that.last_modified_view.output_area != undefined) { | ||||
return that.last_modified_view.output_area; | ||||
} else { | ||||
return null | ||||
} | ||||
}, | ||||
}, | ||||
}; | ||||
} | ||||
return callbacks; | ||||
}, | ||||
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r14278 | |||
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r14342 | // Get the output area corresponding to the msg_id. | ||
// output_area is an instance of Ipython.OutputArea | ||||
_get_output_area: function (msg_id) { | ||||
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r14346 | |||
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r14371 | // First, check to see if the msg was triggered by cell execution. | ||
var cell = IPython.notebook.get_msg_cell(); | ||||
if (cell != null) { | ||||
return cell.output_area; | ||||
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r14342 | } | ||
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r14316 | |||
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r14371 | // Second, check to see if a get_output_area callback was defined | ||
// for the message. get_output_area callbacks are registered for | ||||
// widget messages, so this block is actually checking to see if the | ||||
// message was triggered by a widget. | ||||
var kernel = this.comm_manager.kernel; | ||||
var callbacks = kernel.get_callbacks_for_msg(msg_id); | ||||
if (callbacks != undefined && | ||||
callbacks.iopub != undefined && | ||||
callbacks.iopub.get_output_area != undefined) { | ||||
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r14342 | var output_area = callbacks.iopub.get_output_area(); | ||
if (output_area != null) { | ||||
return output_area; | ||||
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r14316 | } | ||
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r14342 | } | ||
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r14263 | |||
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r14371 | // Not triggered by a cell or widget (no get_output_area callback | ||
// exists). | ||||
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r14342 | return null; | ||
}, | ||||
// Gets widget output area (as a JQuery element) from the | ||||
// output_area (Ipython.OutputArea instance) | ||||
_get_widget_area_element: function (output_area, show) { | ||||
var widget_area = output_area.element | ||||
.parent() // output_wrapper | ||||
.parent() // cell | ||||
.find('.widget-area'); | ||||
if (show) { widget_area.show(); } | ||||
return widget_area.find('.widget-subarea'); | ||||
}, | ||||
}); | ||||
//-------------------------------------------------------------------- | ||||
// WidgetView class | ||||
//-------------------------------------------------------------------- | ||||
var WidgetView = Backbone.View.extend({ | ||||
initialize: function() { | ||||
this.visible = true; | ||||
this.model.on('change',this.update,this); | ||||
this._add_class_calls = this.model.get('_add_class')[0]; | ||||
this._remove_class_calls = this.model.get('_remove_class')[0]; | ||||
}, | ||||
update: function() { | ||||
if (this.model.get('visible') != undefined) { | ||||
if (this.visible != this.model.get('visible')) { | ||||
this.visible = this.model.get('visible'); | ||||
if (this.visible) { | ||||
this.$el.show(); | ||||
} else { | ||||
this.$el.hide(); | ||||
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r14311 | } | ||
} | ||||
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r14342 | } | ||
if (this.model.css != undefined) { | ||||
for (var selector in this.model.css) { | ||||
if (this.model.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 = this.model.css[selector]; | ||||
for (var css_key in css_traits) { | ||||
if (css_traits.hasOwnProperty(css_key)) { | ||||
elements.css(css_key, css_traits[css_key]); | ||||
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r14224 | } | ||
} | ||||
} | ||||
} | ||||
} | ||||
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r14342 | } | ||
var add_class = this.model.get('_add_class'); | ||||
if (add_class != undefined){ | ||||
var add_class_calls = add_class[0]; | ||||
if (add_class_calls > this._add_class_calls) { | ||||
this._add_class_calls = add_class_calls; | ||||
var elements = this.get_selector_element(add_class[1]); | ||||
if (elements.length > 0) { | ||||
elements.addClass(add_class[2]); | ||||
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r14313 | } | ||
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r14342 | } | ||
} | ||||
var remove_class = this.model.get('_remove_class'); | ||||
if (remove_class != undefined){ | ||||
var remove_class_calls = remove_class[0]; | ||||
if (remove_class_calls > this._remove_class_calls) { | ||||
this._remove_class_calls = remove_class_calls; | ||||
var elements = this.get_selector_element(remove_class[1]); | ||||
if (elements.length > 0) { | ||||
elements.removeClass(remove_class[2]); | ||||
} | ||||
} | ||||
} | ||||
}, | ||||
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 $el_to_style element is not defined, use apply the | ||||
// style to the view's element. | ||||
var elements = this.$el.find(selector); | ||||
if (selector=='') { | ||||
if (this.$el_to_style == undefined) { | ||||
elements = this.$el; | ||||
} else { | ||||
elements = this.$el_to_style; | ||||
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r14313 | } | ||
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r14342 | } | ||
return elements; | ||||
}, | ||||
}); | ||||
//-------------------------------------------------------------------- | ||||
// WidgetManager class | ||||
//-------------------------------------------------------------------- | ||||
var WidgetManager = function(){ | ||||
this.comm_manager = null; | ||||
this.widget_model_types = {}; | ||||
this.widget_view_types = {}; | ||||
var that = this; | ||||
Backbone.sync = function(method, model, options, error) { | ||||
var result = model.handle_sync(method, options); | ||||
if (options.success) { | ||||
options.success(result); | ||||
} | ||||
}; | ||||
} | ||||
WidgetManager.prototype.attach_comm_manager = function (comm_manager) { | ||||
this.comm_manager = comm_manager; | ||||
// Register already register widget model types with the comm manager. | ||||
for (var widget_model_name in this.widget_model_types) { | ||||
this.comm_manager.register_target(widget_model_name, $.proxy(this.handle_com_open, this)); | ||||
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r14257 | } | ||
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r14342 | } | ||
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r14237 | |||
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r14278 | |||
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r14342 | WidgetManager.prototype.register_widget_model = function (widget_model_name, widget_model_type) { | ||
// Register the widget with the comm manager. Make sure to pass this object's context | ||||
// in so `this` works in the call back. | ||||
if (this.comm_manager!=null) { | ||||
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r14263 | this.comm_manager.register_target(widget_model_name, $.proxy(this.handle_com_open, this)); | ||
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r14257 | } | ||
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r14342 | this.widget_model_types[widget_model_name] = widget_model_type; | ||
} | ||||
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r14263 | |||
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r14278 | |||
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r14342 | WidgetManager.prototype.register_widget_view = function (widget_view_name, widget_view_type) { | ||
this.widget_view_types[widget_view_name] = widget_view_type; | ||||
} | ||||
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r14263 | |||
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r14278 | |||
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r14342 | WidgetManager.prototype.handle_com_open = function (comm, msg) { | ||
var widget_type_name = msg.content.target_name; | ||||
var widget_model = new this.widget_model_types[widget_type_name](this.comm_manager, comm, this.widget_view_types); | ||||
} | ||||
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r14255 | |||
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r14224 | |||
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r14342 | //-------------------------------------------------------------------- | ||
// Init code | ||||
//-------------------------------------------------------------------- | ||||
IPython.WidgetManager = WidgetManager; | ||||
IPython.WidgetModel = WidgetModel; | ||||
IPython.WidgetView = WidgetView; | ||||
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r14224 | |||
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r14342 | IPython.widget_manager = new WidgetManager(); | ||
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r14224 | |||
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r14263 | }); | ||