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//----------------------------------------------------------------------------
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// Copyright (C) 2013 The IPython Development Team
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//
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// Distributed under the terms of the BSD License. The full license is in
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// the file COPYING, distributed as part of this software.
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//----------------------------------------------------------------------------
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//============================================================================
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// WidgetModel, WidgetView, and WidgetManager
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//============================================================================
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/**
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* Base Widget classes
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* @module IPython
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* @namespace IPython
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* @submodule widget
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*/
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"use strict";
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// Use require.js 'define' method so that require.js is intelligent enough to
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// syncronously load everything within this file when it is being 'required'
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// elsewhere.
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define(["components/underscore/underscore-min",
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"components/backbone/backbone-min",
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], function(){
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// Only run once on a notebook.
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if (IPython.notebook.widget_manager == undefined) {
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//--------------------------------------------------------------------
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// WidgetModel class
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//--------------------------------------------------------------------
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var WidgetModel = Backbone.Model.extend({
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constructor: function(comm_manager, comm, widget_view_types) {
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this.comm_manager = comm_manager;
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this.widget_view_types = widget_view_types;
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this.pending_msgs = 0;
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this.msg_throttle = 3;
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this.msg_buffer = {};
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this.views = {};
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// Remember comm associated with the model.
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this.comm = comm;
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comm.model = this;
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// Hook comm messages up to model.
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comm.on_close($.proxy(this.handle_comm_closed, this));
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comm.on_msg($.proxy(this.handle_comm_msg, this));
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return Backbone.Model.apply(this);
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},
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update_other_views: function(caller) {
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this.last_modified_view = caller;
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this.save(this.changedAttributes(), {patch: true});
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for (var cell_index in this.views) {
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var views = this.views[cell_index];
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for (var view_index in views) {
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var view = views[view_index];
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if (view !== caller) {
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view.update();
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}
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}
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}
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},
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handle_status: function (output_area, msg) {
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//execution_state : ('busy', 'idle', 'starting')
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if (msg.content.execution_state=='idle') {
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// Send buffer if this message caused another message to be
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// throttled.
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if (this.msg_throttle == this.pending_msgs &&
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this.msg_buffer.length > 0) {
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var output_area = this._get_msg_output_area(msg);
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var callbacks = this._make_callbacks(output_area);
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var data = {sync_method: 'patch', sync_data: this.msg_buffer};
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comm.send(data, callbacks);
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this.msg_buffer = {};
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} else {
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// Only decrease the pending message count if the buffer
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// doesn't get flushed (sent).
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--this.pending_msgs;
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}
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}
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},
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// Custom syncronization logic.
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handle_sync: function (method, options) {
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var model_json = this.toJSON();
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// Only send updated state if the state hasn't been changed
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// during an update.
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if (!this.updating) {
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if (this.pending_msgs >= this.msg_throttle) {
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// The throttle has been exceeded, buffer the current msg so
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// it can be sent once the kernel has finished processing
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// some of the existing messages.
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if (method=='patch') {
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for (var attr in options.attrs) {
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this.msg_buffer[attr] = options.attrs[attr];
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}
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} else {
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this.msg_buffer = $.extend({}, model_json); // Copy
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}
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} else {
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// We haven't exceeded the throttle, send the message like
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// normal. If this is a patch operation, just send the
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// changes.
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var send_json = model_json;
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if (method=='patch') {
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send_json = {};
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for (var attr in options.attrs) {
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send_json[attr] = options.attrs[attr];
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}
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}
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var data = {sync_method: method, sync_data: send_json};
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var output_area = this._get_view_output_area(this.last_modified_view);
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var callbacks = this._make_callbacks(output_area);
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this.comm.send(data, callbacks);
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this.pending_msgs++;
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}
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}
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// Since the comm is a one-way communication, assume the message
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// arrived.
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return model_json;
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},
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// Handle incomming comm msg.
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handle_comm_msg: function (msg) {
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var method = msg.content.data.method;
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switch (method){
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case 'display':
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var cell_index = this._get_cell_index(msg.parent_header.msg_id);
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this.display_view(msg.content.data.view_name,
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msg.content.data.parent,
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cell_index);
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break;
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case 'update':
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this.handle_update(msg.content.data.state);
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break;
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}
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},
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// Handle when a widget is updated via the python side.
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handle_update: function (state) {
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this.updating = true;
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try {
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for (var key in state) {
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if (state.hasOwnProperty(key)) {
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if (key == "_css"){
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this.css = state[key];
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} else {
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this.set(key, state[key]);
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}
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}
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}
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this.id = this.comm.comm_id;
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this.save();
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} finally {
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this.updating = false;
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}
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},
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// Handle when a widget is closed.
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handle_comm_closed: function (msg) {
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for (var cell_index in this.views) {
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var views = this.views[cell_index];
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for (var view_index in views) {
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var view = views[view_index];
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view.remove();
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}
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}
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},
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// Create view that represents the model.
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display_view: function (view_name, parent_comm_id, cell_index) {
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var new_views = [];
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var displayed = false;
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if (parent_comm_id != undefined) {
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var parent_comm = this.comm_manager.comms[parent_comm_id];
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var parent_model = parent_comm.model;
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var parent_views = parent_model.views[cell_index];
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for (var parent_view_index in parent_views) {
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var parent_view = parent_views[parent_view_index];
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if (parent_view.display_child != undefined) {
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var view = this._create_view(view_name, cell_index);
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new_views.push(view);
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parent_view.display_child(view);
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displayed = true;
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}
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}
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}
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if (!displayed) {
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// No parent view is defined or exists. Add the view's
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// element to cell's widget div.
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var view = this._create_view(view_name, cell_index);
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new_views.push(view);
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var cell = IPython.notebook.get_cell(cell_index);
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cell.element.find('.widget-area').find('.widget-subarea')
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.append(view.$el)
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.parent().show(); // Show the widget_area (parent of widget_subarea)
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}
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for (var view_index in new_views) {
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var view = new_views[view_index];
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view.update();
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}
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},
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// Create a view
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_create_view: function (view_name, cell_index) {
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var view = new this.widget_view_types[view_name]({model: this});
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view.render();
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if (this.views[cell_index]==undefined) {
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this.views[cell_index] = []
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}
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this.views[cell_index].push(view);
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view.cell_index = cell_index;
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// Handle when the view element is remove from the page.
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var that = this;
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view.$el.on("remove", function(){
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var index = that.views[cell_index].indexOf(view);
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if (index > -1) {
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that.views[cell_index].splice(index, 1);
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}
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view.remove(); // Clean-up view
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if (that.views[cell_index].length()==0) {
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delete that.views[cell_index];
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}
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// Close the comm if there are no views left.
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if (that.views.length()==0) {
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that.comm.close();
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}
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});
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return view;
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},
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// Build a callback dict.
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_make_callbacks: function (output_area) {
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var callbacks = {};
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if (output_area != null) {
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var that = this;
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callbacks = {
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iopub : {
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output : $.proxy(output_area.handle_output, output_area),
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clear_output : $.proxy(output_area.handle_clear_output, output_area),
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status : function(msg){
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that.handle_status(output_area, msg);
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},
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},
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};
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}
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return callbacks;
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},
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// Get the cell index corresponding to the msg_id.
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_get_cell_index: function (msg_id) {
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var cells = IPython.notebook.get_cells();
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for (var cell_index in cells) {
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if (cells[cell_index].last_msg_id == msg_id) {
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return cell_index;
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}
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}
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return -1;
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},
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// Get the cell output area corresponding to the view.
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_get_view_output_area: function (view) {
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return this._get_cell_output_area(view.cell_index);
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},
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// Get the cell output area corresponding to the cell index.
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_get_cell_output_area: function (cell_index) {
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var cell = IPython.notebook.get_cell(cell_index)
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return cell.output_area;
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},
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});
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//--------------------------------------------------------------------
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// WidgetView class
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//--------------------------------------------------------------------
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var WidgetView = Backbone.View.extend({
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initialize: function() {
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this.model.on('change',this.update,this);
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},
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update: function() {
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if (this.model.css != undefined) {
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for (var selector in this.model.css) {
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if (this.model.css.hasOwnProperty(selector)) {
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// Get the elements via the css selector. If the selector is
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// blank, apply the style to the $el_to_style element. If
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// the $el_to_style element is not defined, use apply the
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// style to the view's element.
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var elements = this.$el.find(selector);
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if (selector=='') {
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if (this.$el_to_style == undefined) {
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elements = this.$el;
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} else {
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elements = this.$el_to_style;
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}
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}
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// Apply the css traits to all elements that match the selector.
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if (elements.length>0){
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var css_traits = this.model.css[selector];
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for (var css_key in css_traits) {
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if (css_traits.hasOwnProperty(css_key)) {
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elements.css(css_key, css_traits[css_key]);
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}
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}
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}
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}
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}
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}
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},
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});
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//--------------------------------------------------------------------
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// WidgetManager class
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//--------------------------------------------------------------------
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var WidgetManager = function(comm_manager){
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this.comm_manager = comm_manager;
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this.widget_model_types = {};
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this.widget_view_types = {};
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var that = this;
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Backbone.sync = function(method, model, options, error) {
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var result = model.handle_sync(method, options);
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if (options.success) {
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options.success(result);
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}
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};
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}
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WidgetManager.prototype.register_widget_model = function (widget_model_name, widget_model_type) {
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// Register the widget with the comm manager. Make sure to pass this object's context
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// in so `this` works in the call back.
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this.comm_manager.register_target(widget_model_name, $.proxy(this.handle_com_open, this));
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this.widget_model_types[widget_model_name] = widget_model_type;
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}
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WidgetManager.prototype.register_widget_view = function (widget_view_name, widget_view_type) {
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this.widget_view_types[widget_view_name] = widget_view_type;
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}
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WidgetManager.prototype.handle_com_open = function (comm, msg) {
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var widget_type_name = msg.content.target_name;
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var widget_model = new this.widget_model_types[widget_type_name](this.comm_manager, comm, this.widget_view_types);
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}
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//--------------------------------------------------------------------
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// Init code
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//--------------------------------------------------------------------
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IPython.WidgetManager = WidgetManager;
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IPython.WidgetModel = WidgetModel;
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IPython.WidgetView = WidgetView;
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IPython.notebook.widget_manager = new WidgetManager(IPython.notebook.kernel.comm_manager);
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};
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});
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