|
|
// Copyright (c) IPython Development Team.
|
|
|
// Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
define([
|
|
|
"underscore",
|
|
|
"backbone",
|
|
|
"jquery",
|
|
|
"base/js/utils",
|
|
|
"base/js/namespace",
|
|
|
"services/kernels/comm"
|
|
|
], function (_, Backbone, $, utils, IPython, comm) {
|
|
|
"use strict";
|
|
|
//--------------------------------------------------------------------
|
|
|
// WidgetManager class
|
|
|
//--------------------------------------------------------------------
|
|
|
var WidgetManager = function (comm_manager, notebook) {
|
|
|
/**
|
|
|
* Public constructor
|
|
|
*/
|
|
|
WidgetManager._managers.push(this);
|
|
|
|
|
|
// Attach a comm manager to the
|
|
|
this.keyboard_manager = notebook.keyboard_manager;
|
|
|
this.notebook = notebook;
|
|
|
this.comm_manager = comm_manager;
|
|
|
this.comm_target_name = 'ipython.widget';
|
|
|
this._models = {}; /* Dictionary of model ids and model instance promises */
|
|
|
|
|
|
// Register with the comm manager.
|
|
|
this.comm_manager.register_target(this.comm_target_name, $.proxy(this._handle_comm_open, this));
|
|
|
|
|
|
// Load the initial state of the widget manager if a load callback was
|
|
|
// registered.
|
|
|
var that = this;
|
|
|
if (WidgetManager._load_callback) {
|
|
|
Promise.resolve().then(function () {
|
|
|
return WidgetManager._load_callback.call(that);
|
|
|
}).then(function(state) {
|
|
|
that.set_state(state);
|
|
|
}).catch(utils.reject('Error loading widget manager state', true));
|
|
|
}
|
|
|
|
|
|
// Setup state saving code.
|
|
|
this.notebook.events.on('before_save.Notebook', function() {
|
|
|
var save_callback = WidgetManager._save_callback;
|
|
|
var options = WidgetManager._get_state_options;
|
|
|
if (save_callback) {
|
|
|
that.get_state(options).then(function(state) {
|
|
|
save_callback.call(that, state);
|
|
|
}).catch(utils.reject('Could not call widget save state callback.', true));
|
|
|
}
|
|
|
});
|
|
|
};
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// Class level
|
|
|
//--------------------------------------------------------------------
|
|
|
WidgetManager._model_types = {}; /* Dictionary of model type names (target_name) and model types. */
|
|
|
WidgetManager._view_types = {}; /* Dictionary of view names and view types. */
|
|
|
WidgetManager._managers = []; /* List of widget managers */
|
|
|
WidgetManager._load_callback = null;
|
|
|
WidgetManager._save_callback = null;
|
|
|
|
|
|
WidgetManager.register_widget_model = function (model_name, model_type) {
|
|
|
/**
|
|
|
* Registers a widget model by name.
|
|
|
*/
|
|
|
WidgetManager._model_types[model_name] = model_type;
|
|
|
};
|
|
|
|
|
|
WidgetManager.register_widget_view = function (view_name, view_type) {
|
|
|
/**
|
|
|
* Registers a widget view by name.
|
|
|
*/
|
|
|
WidgetManager._view_types[view_name] = view_type;
|
|
|
};
|
|
|
|
|
|
WidgetManager.set_state_callbacks = function (load_callback, save_callback, options) {
|
|
|
/**
|
|
|
* Registers callbacks for widget state persistence.
|
|
|
*
|
|
|
* Parameters
|
|
|
* ----------
|
|
|
* load_callback: function()
|
|
|
* function that is called when the widget manager state should be
|
|
|
* loaded. This function should return a promise for the widget
|
|
|
* manager state. An empty state is an empty dictionary `{}`.
|
|
|
* save_callback: function(state as dictionary)
|
|
|
* function that is called when the notebook is saved or autosaved.
|
|
|
* The current state of the widget manager is passed in as the first
|
|
|
* argument.
|
|
|
*/
|
|
|
WidgetManager._load_callback = load_callback;
|
|
|
WidgetManager._save_callback = save_callback;
|
|
|
WidgetManager._get_state_options = options;
|
|
|
|
|
|
// Use the load callback to immediately load widget states.
|
|
|
WidgetManager._managers.forEach(function(manager) {
|
|
|
if (load_callback) {
|
|
|
Promise.resolve().then(function () {
|
|
|
return load_callback.call(manager);
|
|
|
}).then(function(state) {
|
|
|
manager.set_state(state);
|
|
|
}).catch(utils.reject('Error loading widget manager state', true));
|
|
|
}
|
|
|
});
|
|
|
};
|
|
|
|
|
|
// Use local storage to persist widgets across page refresh by default.
|
|
|
// LocalStorage is per domain, so we need to explicitly set the URL
|
|
|
// that the widgets are associated with so they don't show on other
|
|
|
// pages hosted by the noteboook server.
|
|
|
var url = [window.location.protocol, '//', window.location.host, window.location.pathname].join('');
|
|
|
var key = 'widgets:' + url;
|
|
|
WidgetManager.set_state_callbacks(function() {
|
|
|
if (localStorage[key]) {
|
|
|
return JSON.parse(localStorage[key]);
|
|
|
}
|
|
|
return {};
|
|
|
}, function(state) {
|
|
|
localStorage[key] = JSON.stringify(state);
|
|
|
});
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// Instance level
|
|
|
//--------------------------------------------------------------------
|
|
|
WidgetManager.prototype.display_view = function(msg, model) {
|
|
|
/**
|
|
|
* Displays a view for a particular model.
|
|
|
*/
|
|
|
var cell = this.get_msg_cell(msg.parent_header.msg_id);
|
|
|
if (cell === null) {
|
|
|
return Promise.reject(new Error("Could not determine where the display" +
|
|
|
" message was from. Widget will not be displayed"));
|
|
|
} else {
|
|
|
return this.display_view_in_cell(cell, model)
|
|
|
.catch(utils.reject('Could not display view', true));
|
|
|
}
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.display_view_in_cell = function(cell, model) {
|
|
|
// Displays a view in a cell.
|
|
|
if (cell.display_widget_view) {
|
|
|
var that = this;
|
|
|
return cell.display_widget_view(this.create_view(model, {
|
|
|
cell: cell,
|
|
|
// Only set cell_index when view is displayed as directly.
|
|
|
cell_index: that.notebook.find_cell_index(cell),
|
|
|
})).then(function(view) {
|
|
|
that._handle_display_view(view);
|
|
|
view.trigger('displayed');
|
|
|
return view;
|
|
|
}).catch(utils.reject('Could not create or display view', true));
|
|
|
} else {
|
|
|
return Promise.reject(new Error('Cell does not have a `display_widget_view` method'));
|
|
|
}
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype._handle_display_view = function (view) {
|
|
|
/**
|
|
|
* Have the IPython keyboard manager disable its event
|
|
|
* handling so the widget can capture keyboard input.
|
|
|
* Note, this is only done on the outer most widgets.
|
|
|
*/
|
|
|
if (this.keyboard_manager) {
|
|
|
this.keyboard_manager.register_events(view.$el);
|
|
|
|
|
|
if (view.additional_elements) {
|
|
|
for (var i = 0; i < view.additional_elements.length; i++) {
|
|
|
this.keyboard_manager.register_events(view.additional_elements[i]);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.create_view = function(model, options) {
|
|
|
/**
|
|
|
* Creates a promise for a view of a given model
|
|
|
*
|
|
|
* Make sure the view creation is not out of order with
|
|
|
* any state updates.
|
|
|
*/
|
|
|
model.state_change = model.state_change.then(function() {
|
|
|
|
|
|
return utils.load_class(model.get('_view_name'), model.get('_view_module'),
|
|
|
WidgetManager._view_types).then(function(ViewType) {
|
|
|
|
|
|
// If a view is passed into the method, use that view's cell as
|
|
|
// the cell for the view that is created.
|
|
|
options = options || {};
|
|
|
if (options.parent !== undefined) {
|
|
|
options.cell = options.parent.options.cell;
|
|
|
}
|
|
|
// Create and render the view...
|
|
|
var parameters = {model: model, options: options};
|
|
|
var view = new ViewType(parameters);
|
|
|
view.listenTo(model, 'destroy', view.remove);
|
|
|
return Promise.resolve(view.render()).then(function() {return view;});
|
|
|
}).catch(utils.reject("Couldn't create a view for model id '" + String(model.id) + "'", true));
|
|
|
});
|
|
|
var id = utils.uuid();
|
|
|
model.views[id] = model.state_change;
|
|
|
model.state_change.then(function(view) {
|
|
|
view.once('remove', function() {
|
|
|
delete view.model.views[id];
|
|
|
}, this);
|
|
|
});
|
|
|
return model.state_change;
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.get_msg_cell = function (msg_id) {
|
|
|
var cell = null;
|
|
|
// First, check to see if the msg was triggered by cell execution.
|
|
|
if (this.notebook) {
|
|
|
cell = this.notebook.get_msg_cell(msg_id);
|
|
|
}
|
|
|
if (cell !== null) {
|
|
|
return cell;
|
|
|
}
|
|
|
// Second, check to see if a get_cell callback was defined
|
|
|
// for the message. get_cell 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;
|
|
|
if (kernel) {
|
|
|
var callbacks = kernel.get_callbacks_for_msg(msg_id);
|
|
|
if (callbacks && callbacks.iopub &&
|
|
|
callbacks.iopub.get_cell !== undefined) {
|
|
|
return callbacks.iopub.get_cell();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Not triggered by a cell or widget (no get_cell callback
|
|
|
// exists).
|
|
|
return null;
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.callbacks = function (view) {
|
|
|
/**
|
|
|
* callback handlers specific a view
|
|
|
*/
|
|
|
var callbacks = {};
|
|
|
if (view && view.options.cell) {
|
|
|
|
|
|
// Try to get output handlers
|
|
|
var cell = view.options.cell;
|
|
|
var handle_output = null;
|
|
|
var handle_clear_output = null;
|
|
|
if (cell.output_area) {
|
|
|
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 dictionary using what is known
|
|
|
var that = this;
|
|
|
callbacks = {
|
|
|
iopub : {
|
|
|
output : handle_output,
|
|
|
clear_output : handle_clear_output,
|
|
|
|
|
|
// 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;
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.get_model = function (model_id) {
|
|
|
/**
|
|
|
* Get a promise for a model by model id.
|
|
|
*/
|
|
|
return this._models[model_id];
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype._handle_comm_open = function (comm, msg) {
|
|
|
/**
|
|
|
* Handle when a comm is opened.
|
|
|
*/
|
|
|
return this.create_model({
|
|
|
model_name: msg.content.data.model_name,
|
|
|
model_module: msg.content.data.model_module,
|
|
|
comm: comm}).catch(utils.reject("Couldn't create a model.", true));
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.create_model = function (options) {
|
|
|
/**
|
|
|
* Create and return a promise for a new widget model
|
|
|
*
|
|
|
* Minimally, one must provide the model_name and widget_class
|
|
|
* parameters to create a model from Javascript.
|
|
|
*
|
|
|
* Example
|
|
|
* --------
|
|
|
* JS:
|
|
|
* IPython.notebook.kernel.widget_manager.create_model({
|
|
|
* model_name: 'WidgetModel',
|
|
|
* widget_class: 'IPython.html.widgets.widget_int.IntSlider'})
|
|
|
* .then(function(model) { console.log('Create success!', model); },
|
|
|
* $.proxy(console.error, console));
|
|
|
*
|
|
|
* Parameters
|
|
|
* ----------
|
|
|
* options: dictionary
|
|
|
* Dictionary of options with the following contents:
|
|
|
* model_name: string
|
|
|
* Target name of the widget model to create.
|
|
|
* model_module: (optional) string
|
|
|
* Module name of the widget model to create.
|
|
|
* widget_class: (optional) string
|
|
|
* Target name of the widget in the back-end.
|
|
|
* comm: (optional) Comm
|
|
|
*
|
|
|
* Create a comm if it wasn't provided.
|
|
|
*/
|
|
|
var comm = options.comm;
|
|
|
if (!comm) {
|
|
|
comm = this.comm_manager.new_comm('ipython.widget', {'widget_class': options.widget_class});
|
|
|
}
|
|
|
|
|
|
var that = this;
|
|
|
var model_id = comm.comm_id;
|
|
|
var model_promise = utils.load_class(options.model_name, options.model_module, WidgetManager._model_types)
|
|
|
.then(function(ModelType) {
|
|
|
var widget_model = new ModelType(that, model_id, comm);
|
|
|
widget_model.once('comm:close', function () {
|
|
|
delete that._models[model_id];
|
|
|
});
|
|
|
widget_model.name = options.model_name;
|
|
|
widget_model.module = options.model_module;
|
|
|
return widget_model;
|
|
|
|
|
|
}, function(error) {
|
|
|
delete that._models[model_id];
|
|
|
var wrapped_error = new utils.WrappedError("Couldn't create model", error);
|
|
|
return Promise.reject(wrapped_error);
|
|
|
});
|
|
|
this._models[model_id] = model_promise;
|
|
|
return model_promise;
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.get_state = function(options) {
|
|
|
/**
|
|
|
* Asynchronously get the state of the widget manager.
|
|
|
*
|
|
|
* This includes all of the widget models and the cells that they are
|
|
|
* displayed in.
|
|
|
*
|
|
|
* Parameters
|
|
|
* ----------
|
|
|
* options: dictionary
|
|
|
* Dictionary of options with the following contents:
|
|
|
* only_displayed: (optional) boolean=false
|
|
|
* Only return models with one or more displayed views.
|
|
|
* not_live: (optional) boolean=false
|
|
|
* Include models that have comms with severed connections.
|
|
|
*
|
|
|
* Returns
|
|
|
* -------
|
|
|
* Promise for a state dictionary
|
|
|
*/
|
|
|
var that = this;
|
|
|
return utils.resolve_promises_dict(this._models).then(function(models) {
|
|
|
var state = {};
|
|
|
|
|
|
var model_promises = [];
|
|
|
for (var model_id in models) {
|
|
|
if (models.hasOwnProperty(model_id)) {
|
|
|
var model = models[model_id];
|
|
|
|
|
|
// If the model has one or more views defined for it,
|
|
|
// consider it displayed.
|
|
|
var displayed_flag = !(options && options.only_displayed) || Object.keys(model.views).length > 0;
|
|
|
var live_flag = (options && options.not_live) || model.comm_live;
|
|
|
if (displayed_flag && live_flag) {
|
|
|
state[model_id] = {
|
|
|
model_name: model.name,
|
|
|
model_module: model.module,
|
|
|
state: model.get_state(),
|
|
|
views: [],
|
|
|
};
|
|
|
|
|
|
// Get the views that are displayed *now*.
|
|
|
(function(local_state) {
|
|
|
model_promises.push(utils.resolve_promises_dict(model.views).then(function(model_views) {
|
|
|
for (var id in model_views) {
|
|
|
if (model_views.hasOwnProperty(id)) {
|
|
|
var view = model_views[id];
|
|
|
if (view.options.cell_index) {
|
|
|
local_state.views.push(view.options.cell_index);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}));
|
|
|
})(state[model_id]);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
return Promise.all(model_promises).then(function() { return state; });
|
|
|
}).catch(utils.reject('Could not get state of widget manager', true));
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype.set_state = function(state) {
|
|
|
/**
|
|
|
* Set the notebook's state.
|
|
|
*
|
|
|
* Reconstructs all of the widget models and attempts to redisplay the
|
|
|
* widgets in the appropriate cells by cell index.
|
|
|
*/
|
|
|
|
|
|
// Get the kernel when it's available.
|
|
|
var that = this;
|
|
|
return this._get_connected_kernel().then(function(kernel) {
|
|
|
|
|
|
// Recreate all the widget models for the given state and
|
|
|
// display the views.
|
|
|
that.all_views = [];
|
|
|
var model_ids = Object.keys(state);
|
|
|
for (var i = 0; i < model_ids.length; i++) {
|
|
|
var model_id = model_ids[i];
|
|
|
|
|
|
// Recreate a comm using the widget's model id (model_id == comm_id).
|
|
|
var new_comm = new comm.Comm(kernel.widget_manager.comm_target_name, model_id);
|
|
|
kernel.comm_manager.register_comm(new_comm);
|
|
|
|
|
|
// Create the model using the recreated comm. When the model is
|
|
|
// created we don't know yet if the comm is valid so set_comm_live
|
|
|
// false. Once we receive the first state push from the back-end
|
|
|
// we know the comm is alive.
|
|
|
var views = kernel.widget_manager.create_model({
|
|
|
comm: new_comm,
|
|
|
model_name: state[model_id].model_name,
|
|
|
model_module: state[model_id].model_module})
|
|
|
.then(function(model) {
|
|
|
|
|
|
model.set_comm_live(false);
|
|
|
var view_promise = Promise.resolve().then(function() {
|
|
|
return model.set_state(state[model.id].state);
|
|
|
}).then(function() {
|
|
|
model.request_state().then(function() {
|
|
|
model.set_comm_live(true);
|
|
|
});
|
|
|
|
|
|
// Display the views of the model.
|
|
|
var views = [];
|
|
|
var model_views = state[model.id].views;
|
|
|
for (var j=0; j<model_views.length; j++) {
|
|
|
var cell_index = model_views[j];
|
|
|
var cell = that.notebook.get_cell(cell_index);
|
|
|
views.push(that.display_view_in_cell(cell, model));
|
|
|
}
|
|
|
return Promise.all(views);
|
|
|
});
|
|
|
return view_promise;
|
|
|
});
|
|
|
that.all_views.push(views);
|
|
|
}
|
|
|
return Promise.all(that.all_views);
|
|
|
}).catch(utils.reject('Could not set widget manager state.', true));
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype._get_connected_kernel = function() {
|
|
|
/**
|
|
|
* Gets a promise for a connected kernel
|
|
|
*/
|
|
|
var that = this;
|
|
|
return new Promise(function(resolve, reject) {
|
|
|
if (that.comm_manager &&
|
|
|
that.comm_manager.kernel &&
|
|
|
that.comm_manager.kernel.is_connected()) {
|
|
|
|
|
|
resolve(that.comm_manager.kernel);
|
|
|
} else {
|
|
|
that.notebook.events.on('kernel_connected.Kernel', function(event, data) {
|
|
|
resolve(data.kernel);
|
|
|
});
|
|
|
}
|
|
|
});
|
|
|
};
|
|
|
|
|
|
// Backwards compatibility.
|
|
|
IPython.WidgetManager = WidgetManager;
|
|
|
|
|
|
return {'WidgetManager': WidgetManager};
|
|
|
});
|
|
|
|
