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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(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(comm_manager, comm, widget_manager) {
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this.comm_manager = comm_manager;
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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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// 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 in this.views) {
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var views = this.views[cell];
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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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on_view_displayed: function (callback) {
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this._view_displayed_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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// Handle when a widget is closed.
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_handle_comm_closed: function (msg) {
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for (var cell in this.views) {
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var views = this.views[cell];
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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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delete this.comm.model; // Delete ref so GC will collect widget model.
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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._display_view(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._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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// 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.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_status: function (cell, 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_buffer != null &&
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this.msg_throttle == this.pending_msgs) {
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var cell = this._get_msg_cell(msg.parent_header.msg_id);
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var callbacks = this._make_callbacks(cell);
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var data = {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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// 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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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 (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 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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// 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_displayed: function(view) {
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if (this._view_displayed_callback) {
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try {
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this._view_displayed_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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// Create view that represents the model.
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_display_view: function (view_name, parent_comm_id, cell) {
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var new_views = [];
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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_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];
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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);
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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_displayed(view);
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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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var 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_displayed(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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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) {
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var view_type = this.widget_manager.widget_view_types[view_name];
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if (view_type != undefined && view_type != null) {
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var view = new view_type({model: this});
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view.render();
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if (this.views[cell]==undefined) {
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this.views[cell] = []
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}
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this.views[cell].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[cell].indexOf(view);
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if (index > -1) {
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that.views[cell].splice(index, 1);
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}
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view.remove(); // Clean-up view
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if (that.views[cell].length()==0) {
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delete that.views[cell];
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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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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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that.comm.close();
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delete that.comm.model; // Delete ref so GC will collect widget model.
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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 && cell.output_area != undefined && cell.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(cell.output_area.handle_output, cell.output_area),
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clear_output : $.proxy(cell.output_area.handle_clear_output, cell.output_area),
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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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if (that.last_modified_view != undefined &&
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that.last_modified_view.cell != undefined) {
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return that.last_modified_view.cell;
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} else {
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return null
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}
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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.comm_manager.kernel;
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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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// 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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});
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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.visible = true;
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this.model.on('change',this.update,this);
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this._add_class_calls = this.model.get('_add_class')[0];
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this._remove_class_calls = this.model.get('_remove_class')[0];
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},
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update: function() {
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if (this.model.get('visible') != undefined) {
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if (this.visible != this.model.get('visible')) {
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this.visible = this.model.get('visible');
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if (this.visible) {
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this.$el.show();
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} else {
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this.$el.hide();
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}
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}
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}
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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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// Apply the css traits to all elements that match the selector.
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var elements = this._get_selector_element(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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var add_class = this.model.get('_add_class');
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if (add_class != undefined){
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var add_class_calls = add_class[0];
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if (add_class_calls > this._add_class_calls) {
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this._add_class_calls = add_class_calls;
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var elements = this._get_selector_element(add_class[1]);
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if (elements.length > 0) {
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elements.addClass(add_class[2]);
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}
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}
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}
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var remove_class = this.model.get('_remove_class');
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if (remove_class != undefined){
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var remove_class_calls = remove_class[0];
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if (remove_class_calls > this._remove_class_calls) {
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this._remove_class_calls = remove_class_calls;
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var elements = this._get_selector_element(remove_class[1]);
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if (elements.length > 0) {
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elements.removeClass(remove_class[2]);
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}
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}
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}
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},
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_get_selector_element: function(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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return elements;
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},
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});
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|
|
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|
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//--------------------------------------------------------------------
|
|
|
// 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));
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
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) {
|
|
|
this.comm_manager.register_target(widget_model_name, $.proxy(this._handle_com_open, this));
|
|
|
}
|
|
|
this.widget_model_types[widget_model_name] = widget_model_type;
|
|
|
}
|
|
|
|
|
|
|
|
|
WidgetManager.prototype.register_widget_view = function (widget_view_name, widget_view_type) {
|
|
|
this.widget_view_types[widget_view_name] = widget_view_type;
|
|
|
}
|
|
|
|
|
|
|
|
|
WidgetManager.prototype.get_msg_cell = function (msg_id) {
|
|
|
if (IPython.notebook != undefined && IPython.notebook != null) {
|
|
|
return IPython.notebook.get_msg_cell(msg_id);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
WidgetManager.prototype.on_create_widget = function (callback) {
|
|
|
this._create_widget_callback = callback;
|
|
|
}
|
|
|
|
|
|
|
|
|
WidgetManager.prototype._handle_create_widget = function (widget_model) {
|
|
|
if (this._create_widget_callback) {
|
|
|
try {
|
|
|
this._create_widget_callback(widget_model);
|
|
|
} catch (e) {
|
|
|
console.log("Exception in WidgetManager callback", e, widget_model);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
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);
|
|
|
this._handle_create_widget(widget_model);
|
|
|
}
|
|
|
|
|
|
|
|
|
//--------------------------------------------------------------------
|
|
|
// Init code
|
|
|
//--------------------------------------------------------------------
|
|
|
IPython.WidgetManager = WidgetManager;
|
|
|
IPython.WidgetModel = WidgetModel;
|
|
|
IPython.WidgetView = WidgetView;
|
|
|
|
|
|
if (IPython.widget_manager==undefined || IPython.widget_manager==null) {
|
|
|
IPython.widget_manager = new WidgetManager();
|
|
|
}
|
|
|
|
|
|
return IPython.widget_manager;
|
|
|
});
|
|
|
|
