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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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// Base Widget Model and View classes
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//============================================================================
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/**
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* @module IPython
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* @namespace IPython
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**/
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define(["notebook/js/widgetmanager",
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"underscore",
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"backbone"],
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function(widget_manager, underscore, backbone){
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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 (widget_manager, widget_id, comm) {
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this.widget_manager = widget_manager;
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this.pending_msgs = 0;
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this.msg_throttle = 3;
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this.msg_buffer = null;
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this.views = [];
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this.id = widget_id;
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this._custom_msg_callbacks = [];
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if (comm !== undefined) {
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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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}
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return Backbone.Model.apply(this);
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},
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send: function (content, cell) {
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if (this._has_comm()) {
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// Used the last modified view as the sender of the message. This
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// will insure that any python code triggered by the sent message
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// can create and display widgets and output.
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if (cell === undefined) {
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if (this.last_modified_view !== undefined &&
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this.last_modified_view.cell !== undefined) {
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cell = this.last_modified_view.cell;
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}
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}
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var callbacks = this._make_callbacks(cell);
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var data = {method: 'custom', custom_content: content};
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this.comm.send(data, callbacks);
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}
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},
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on_view_created: function (callback) {
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this._view_created_callback = callback;
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},
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on_close: function (callback) {
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this._close_callback = callback;
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},
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on_msg: function (callback, remove) {
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if (remove) {
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var found_index = -1;
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for (var index in this._custom_msg_callbacks) {
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if (callback === this._custom_msg_callbacks[index]) {
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found_index = index;
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break;
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}
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}
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if (found_index >= 0) {
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this._custom_msg_callbacks.splice(found_index, 1);
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}
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} else {
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this._custom_msg_callbacks.push(callback);
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}
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},
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_handle_custom_msg: function (content) {
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for (var index in this._custom_msg_callbacks) {
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try {
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this._custom_msg_callbacks[index](content);
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} catch (e) {
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console.log("Exception in widget model msg callback", e, content);
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}
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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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this._execute_views_method('remove');
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if (this._has_comm()) {
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delete this.comm.model; // Delete ref so GC will collect widget model.
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delete this.comm;
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}
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delete this.widget_id; // Delete id from model so widget manager cleans up.
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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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// Try to get the cell.
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var cell = this._get_msg_cell(msg.parent_header.msg_id);
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if (cell === null) {
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console.log("Could not determine where the display" +
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" message was from. Widget will not be displayed");
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} else {
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this.create_views(msg.content.data.view_name,
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msg.content.data.parent,
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cell);
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}
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break;
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case 'update':
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this.apply_update(msg.content.data.state);
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break;
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case 'add_class':
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case 'remove_class':
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var selector = msg.content.data.selector;
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if (selector === undefined) {
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selector = '';
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}
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var class_list = msg.content.data.class_list;
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this._execute_views_method(method, selector, class_list);
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break;
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case 'set_snapshot':
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var cell = this._get_msg_cell(msg.parent_header.msg_id);
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cell.metadata.snapshot = msg.content.data.snapshot;
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break;
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case 'custom':
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this._handle_custom_msg(msg.content.data.custom_content);
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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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apply_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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// Set the css value of the model as an attribute
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// instead of a backbone trait because we are only
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// interested in backend css -> frontend css. In
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// other words, if the css dict changes in the
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// frontend, we don't need to push the changes to
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// the backend.
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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.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_status: function (cell, msg) {
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//execution_state : ('busy', 'idle', 'starting')
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if (this._has_comm()) {
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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_buffer !== null &&
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this.msg_throttle == this.pending_msgs) {
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var callbacks = this._make_callbacks(cell);
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var data = {method: 'backbone', sync_method: 'update', sync_data: this.msg_buffer};
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this.comm.send(data, callbacks);
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this.msg_buffer = null;
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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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},
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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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var attr;
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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._has_comm()) {
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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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if (this.msg_buffer === null) {
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this.msg_buffer = $.extend({}, model_json); // Copy
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}
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for (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 (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 = {method: 'backbone', sync_method: method, sync_data: send_json};
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var cell = null;
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if (this.last_modified_view !== undefined && this.last_modified_view !== null) {
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cell = this.last_modified_view.cell;
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}
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var callbacks = this._make_callbacks(cell);
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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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}
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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_view_created: function (view) {
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if (this._view_created_callback) {
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try {
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this._view_created_callback(view);
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} catch (e) {
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console.log("Exception in widget model view displayed callback", e, view, this);
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}
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}
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},
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_execute_views_method: function (/* method_name, [argument0], [argument1], [...] */) {
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var method_name = arguments[0];
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var args = null;
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if (arguments.length > 1) {
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args = [].splice.call(arguments,1);
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}
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for (var view_index in this.views) {
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var view = this.views[view_index];
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var method = view[method_name];
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if (args === null) {
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method.apply(view);
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} else {
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method.apply(view, args);
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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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create_views: function (view_name, parent_id, cell) {
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var new_views = [];
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var view;
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// Try creating and adding the view to it's parent.
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var displayed = false;
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if (parent_id !== undefined) {
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var parent_model = this.widget_manager.get_model(parent_id);
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if (parent_model !== null) {
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var parent_views = parent_model.views;
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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.cell === cell) {
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if (parent_view.display_child !== undefined) {
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view = this._create_view(view_name, cell);
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if (view !== null) {
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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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this._handle_view_created(view);
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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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// If 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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if (!displayed) {
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view = this._create_view(view_name, cell);
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if (view !== null) {
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new_views.push(view);
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if (cell.widget_subarea !== undefined && cell.widget_subarea !== null) {
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cell.widget_area.show();
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cell.widget_subarea.append(view.$el);
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this._handle_view_created(view);
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}
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}
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}
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// Force the new view(s) to update their selves
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for (var view_index in new_views) {
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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) {
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var ViewType = this.widget_manager.widget_view_types[view_name];
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if (ViewType !== undefined && ViewType !== null) {
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var view = new ViewType({model: this});
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view.render();
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this.views.push(view);
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view.cell = cell;
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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.indexOf(view);
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if (index > -1) {
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that.views.splice(index, 1);
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}
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view.remove(); // Clean-up view
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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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if (that._close_callback) {
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try {
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that._close_callback(that);
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} catch (e) {
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console.log("Exception in widget model close callback", e, that);
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}
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}
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if (that._has_comm()) {
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that.comm.close();
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delete that.comm.model; // Delete ref so GC will collect widget model.
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delete that.comm;
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}
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delete that.widget_id; // Delete id from model so widget manager cleans up.
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}
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});
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return view;
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}
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return null;
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},
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// Build a callback dict.
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_make_callbacks: function (cell) {
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var callbacks = {};
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if (cell !== null) {
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// Try to get output handlers
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var handle_output = null;
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var handle_clear_output = null;
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if (cell.output_area !== undefined && cell.output_area !== null) {
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handle_output = $.proxy(cell.output_area.handle_output, cell.output_area);
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handle_clear_output = $.proxy(cell.output_area.handle_clear_output, cell.output_area);
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}
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// Create callback dict usign what is known
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var that = this;
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callbacks = {
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iopub : {
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output : handle_output,
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clear_output : handle_clear_output,
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status : function (msg) {
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that._handle_status(cell, msg);
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},
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// Special function only registered by widget messages.
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// Allows us to get the cell for a message so we know
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// where to add widgets if the code requires it.
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get_cell : function () {
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return cell;
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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 output area corresponding to the msg_id.
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// cell is an instance of IPython.Cell
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_get_msg_cell: function (msg_id) {
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// First, check to see if the msg was triggered by cell execution.
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var cell = this.widget_manager.get_msg_cell(msg_id);
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if (cell !== null) {
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return cell;
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}
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// Second, check to see if a get_cell callback was defined
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// for the message. get_cell callbacks are registered for
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// widget messages, so this block is actually checking to see if the
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// message was triggered by a widget.
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var kernel = this.widget_manager.get_kernel();
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if (kernel !== undefined && kernel !== null) {
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var callbacks = kernel.get_callbacks_for_msg(msg_id);
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if (callbacks !== undefined &&
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callbacks.iopub !== undefined &&
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callbacks.iopub.get_cell !== undefined) {
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return callbacks.iopub.get_cell();
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}
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}
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// Not triggered by a cell or widget (no get_cell callback
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// exists).
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return null;
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},
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// Function that checks if a comm has been attached to this widget
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// model. Returns True if a valid comm is attached.
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_has_comm: function() {
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return this.comm !== undefined && this.comm !== null;
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},
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});
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//--------------------------------------------------------------------
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|
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// WidgetView class
|
|
|
//--------------------------------------------------------------------
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|
|
var WidgetView = Backbone.View.extend({
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initialize: function () {
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this.visible = true;
|
|
|
this.model.on('sync',this.update,this);
|
|
|
},
|
|
|
|
|
|
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);
|
|
|
}
|
|
|
},
|
|
|
|
|
|
|
|
|
send: function (content) {
|
|
|
this.model.send(content, this.cell);
|
|
|
},
|
|
|
|
|
|
|
|
|
touch: function () {
|
|
|
this.model.last_modified_view = this;
|
|
|
this.model.save(this.model.changedAttributes(), {patch: true});
|
|
|
},
|
|
|
|
|
|
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();
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
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]);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
},
|
|
|
|
|
|
_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 === undefined || selector === null || selector === '') {
|
|
|
if (this.$el_to_style === undefined) {
|
|
|
elements = this.$el;
|
|
|
} else {
|
|
|
elements = this.$el_to_style;
|
|
|
}
|
|
|
}
|
|
|
return elements;
|
|
|
},
|
|
|
});
|
|
|
|
|
|
IPython.WidgetModel = WidgetModel;
|
|
|
IPython.WidgetView = WidgetView;
|
|
|
|
|
|
return widget_manager;
|
|
|
});
|
