|
|
// Copyright (c) IPython Development Team.
|
|
|
// Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
define([
|
|
|
"underscore",
|
|
|
"backbone",
|
|
|
"jquery",
|
|
|
"base/js/namespace"
|
|
|
], function (_, Backbone, $, IPython) {
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// 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._models = {}; /* Dictionary of model ids and model instances */
|
|
|
|
|
|
// Register already-registered widget model types with the comm manager.
|
|
|
var that = this;
|
|
|
_.each(WidgetManager._model_types, function(model_type, model_name) {
|
|
|
that.comm_manager.register_target(model_name, $.proxy(that._handle_comm_open, that));
|
|
|
});
|
|
|
};
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// 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.register_widget_model = function (model_name, model_type) {
|
|
|
// Registers a widget model by name.
|
|
|
WidgetManager._model_types[model_name] = 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.
|
|
|
_.each(WidgetManager._managers, function(instance, i) {
|
|
|
if (instance.comm_manager !== null) {
|
|
|
instance.comm_manager.register_target(model_name, $.proxy(instance._handle_comm_open, instance));
|
|
|
}
|
|
|
});
|
|
|
};
|
|
|
|
|
|
WidgetManager.register_widget_view = function (view_name, view_type) {
|
|
|
// Registers a widget view by name.
|
|
|
WidgetManager._view_types[view_name] = view_type;
|
|
|
};
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// Instance level
|
|
|
//--------------------------------------------------------------------
|
|
|
WidgetManager.prototype.display_view = function(msg, model) {
|
|
|
// Displays a view for a particular model.
|
|
|
var cell = this.get_msg_cell(msg.parent_header.msg_id);
|
|
|
if (cell === null) {
|
|
|
console.log("Could not determine where the display" +
|
|
|
" message was from. Widget will not be displayed");
|
|
|
} else {
|
|
|
var that = this;
|
|
|
this.create_view(model, {cell: cell, callback: function(view) {
|
|
|
if (view === null) {
|
|
|
console.error("View creation failed", model);
|
|
|
}
|
|
|
that._handle_display_view(view);
|
|
|
if (cell.widget_subarea) {
|
|
|
cell.widget_subarea.append(view.$el);
|
|
|
}
|
|
|
view.trigger('displayed');
|
|
|
}});
|
|
|
}
|
|
|
};
|
|
|
|
|
|
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, view) {
|
|
|
// Creates a view for a particular model.
|
|
|
|
|
|
var view_name = model.get('_view_name');
|
|
|
var view_mod = model.get('_view_module');
|
|
|
errback = options.errback || function(err) {console.log(err)};
|
|
|
|
|
|
var instantiate_view = function(ViewType) {
|
|
|
if (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 (view !== undefined) {
|
|
|
options.cell = view.options.cell;
|
|
|
}
|
|
|
|
|
|
// Create and render the view...
|
|
|
var parameters = {model: model, options: options};
|
|
|
view = new ViewType(parameters);
|
|
|
view.render();
|
|
|
model.on('destroy', view.remove, view);
|
|
|
options.callback(view);
|
|
|
} else {
|
|
|
errback({unknown_view: true, view_name: view_name,
|
|
|
view_module: view_mod})
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (view_mod) {
|
|
|
require([view_mod], function(module) {
|
|
|
instantiate_view(module[view_name])
|
|
|
}, errback);
|
|
|
} else {
|
|
|
instantiate_view(WidgetManager._view_types[view_name]);
|
|
|
}
|
|
|
};
|
|
|
|
|
|
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 dict 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) {
|
|
|
// Look-up a model instance by its id.
|
|
|
var model = this._models[model_id];
|
|
|
if (model !== undefined && model.id == model_id) {
|
|
|
return model;
|
|
|
}
|
|
|
return null;
|
|
|
};
|
|
|
|
|
|
WidgetManager.prototype._handle_comm_open = function (comm, msg) {
|
|
|
// Handle when a comm is opened.
|
|
|
var that = this;
|
|
|
var model_id = comm.comm_id;
|
|
|
var widget_type_name = msg.content.target_name;
|
|
|
var widget_model = new WidgetManager._model_types[widget_type_name](this, model_id, comm);
|
|
|
widget_model.on('comm:close', function () {
|
|
|
delete that._models[model_id];
|
|
|
});
|
|
|
this._models[model_id] = widget_model;
|
|
|
};
|
|
|
|
|
|
// Backwards compatability.
|
|
|
IPython.WidgetManager = WidgetManager;
|
|
|
|
|
|
return {'WidgetManager': WidgetManager};
|
|
|
});
|
|
|
|
