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1 | 1 | // Copyright (c) IPython Development Team. |
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2 | 2 | // Distributed under the terms of the Modified BSD License. |
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3 | 3 | |
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4 | 4 | define([ |
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5 | 5 | "underscore", |
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6 | 6 | "backbone", |
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7 | 7 | "jquery", |
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8 | 8 | "base/js/utils", |
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9 | 9 | "base/js/namespace", |
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10 | 10 | "services/kernels/comm" |
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11 | 11 | ], function (_, Backbone, $, utils, IPython, comm) { |
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12 | 12 | "use strict"; |
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13 | 13 | //-------------------------------------------------------------------- |
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14 | 14 | // WidgetManager class |
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15 | 15 | //-------------------------------------------------------------------- |
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16 | 16 | var WidgetManager = function (comm_manager, notebook) { |
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17 | 17 | /** |
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18 | 18 | * Public constructor |
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19 | 19 | */ |
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20 | 20 | WidgetManager._managers.push(this); |
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21 | 21 | |
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22 | 22 | // Attach a comm manager to the |
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23 | 23 | this.keyboard_manager = notebook.keyboard_manager; |
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24 | 24 | this.notebook = notebook; |
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25 | 25 | this.comm_manager = comm_manager; |
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26 | 26 | this.comm_target_name = 'ipython.widget'; |
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27 | 27 | this._models = {}; /* Dictionary of model ids and model instance promises */ |
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28 | 28 | |
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29 | 29 | // Register with the comm manager. |
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30 | 30 | this.comm_manager.register_target(this.comm_target_name, $.proxy(this._handle_comm_open, this)); |
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31 | 31 | |
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32 | 32 | // Load the initial state of the widget manager if a load callback was |
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33 | 33 | // registered. |
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34 | 34 | var that = this; |
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35 | 35 | if (WidgetManager._load_callback) { |
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36 | 36 | Promise.resolve().then(function () { |
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37 | 37 | return WidgetManager._load_callback.call(that); |
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38 | 38 | }).then(function(state) { |
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39 | 39 | that.set_state(state); |
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40 | 40 | }).catch(utils.reject('Error loading widget manager state', true)); |
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41 | 41 | } |
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42 | 42 | |
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43 | 43 | // Setup state saving code. |
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44 | 44 | this.notebook.events.on('before_save.Notebook', function() { |
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45 | 45 | var save_callback = WidgetManager._save_callback; |
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46 | 46 | var options = WidgetManager._get_state_options; |
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47 | 47 | if (save_callback) { |
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48 | 48 | that.get_state(options).then(function(state) { |
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49 | 49 | save_callback.call(that, state); |
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50 | 50 | }).catch(utils.reject('Could not call widget save state callback.', true)); |
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51 | 51 | } |
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52 | 52 | }); |
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53 | 53 | }; |
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54 | 54 | |
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55 | 55 | //-------------------------------------------------------------------- |
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56 | 56 | // Class level |
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57 | 57 | //-------------------------------------------------------------------- |
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58 | 58 | WidgetManager._model_types = {}; /* Dictionary of model type names (target_name) and model types. */ |
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59 | 59 | WidgetManager._view_types = {}; /* Dictionary of view names and view types. */ |
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60 | 60 | WidgetManager._managers = []; /* List of widget managers */ |
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61 | 61 | WidgetManager._load_callback = null; |
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62 | 62 | WidgetManager._save_callback = null; |
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63 | 63 | |
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64 | 64 | WidgetManager.register_widget_model = function (model_name, model_type) { |
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65 | 65 | /** |
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66 | 66 | * Registers a widget model by name. |
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67 | 67 | */ |
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68 | 68 | WidgetManager._model_types[model_name] = model_type; |
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69 | 69 | }; |
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70 | 70 | |
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71 | 71 | WidgetManager.register_widget_view = function (view_name, view_type) { |
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72 | 72 | /** |
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73 | 73 | * Registers a widget view by name. |
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74 | 74 | */ |
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75 | 75 | WidgetManager._view_types[view_name] = view_type; |
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76 | 76 | }; |
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77 | 77 | |
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78 | 78 | WidgetManager.set_state_callbacks = function (load_callback, save_callback, options) { |
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79 | 79 | /** |
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80 | 80 | * Registers callbacks for widget state persistence. |
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81 | 81 | * |
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82 | 82 | * Parameters |
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83 | 83 | * ---------- |
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84 | 84 | * load_callback: function() |
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85 | 85 | * function that is called when the widget manager state should be |
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86 | 86 | * loaded. This function should return a promise for the widget |
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87 | 87 | * manager state. An empty state is an empty dictionary `{}`. |
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88 | 88 | * save_callback: function(state as dictionary) |
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89 | 89 | * function that is called when the notebook is saved or autosaved. |
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90 | 90 | * The current state of the widget manager is passed in as the first |
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91 | 91 | * argument. |
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92 | 92 | */ |
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93 | 93 | WidgetManager._load_callback = load_callback; |
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94 | 94 | WidgetManager._save_callback = save_callback; |
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95 | 95 | WidgetManager._get_state_options = options; |
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96 | 96 | |
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97 | 97 | // Use the load callback to immediately load widget states. |
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98 | 98 | WidgetManager._managers.forEach(function(manager) { |
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99 | 99 | if (load_callback) { |
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100 | 100 | Promise.resolve().then(function () { |
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101 | 101 | return load_callback.call(manager); |
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102 | 102 | }).then(function(state) { |
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103 | 103 | manager.set_state(state); |
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104 | 104 | }).catch(utils.reject('Error loading widget manager state', true)); |
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105 | 105 | } |
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106 | 106 | }); |
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107 | 107 | }; |
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108 | 108 | |
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109 | 109 | // Use local storage to persist widgets across page refresh by default. |
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110 | 110 | // LocalStorage is per domain, so we need to explicitly set the URL |
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111 | 111 | // that the widgets are associated with so they don't show on other |
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112 | 112 | // pages hosted by the noteboook server. |
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113 | 113 | var url = [window.location.protocol, '//', window.location.host, window.location.pathname].join(''); |
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114 | 114 | var key = 'widgets:' + url; |
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115 | 115 | WidgetManager.set_state_callbacks(function() { |
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116 | 116 | if (localStorage[key]) { |
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117 | 117 | return JSON.parse(localStorage[key]); |
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118 | 118 | } |
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119 | 119 | return {}; |
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120 | 120 | }, function(state) { |
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121 | 121 | localStorage[key] = JSON.stringify(state); |
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122 | 122 | }); |
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123 | 123 | |
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124 | 124 | //-------------------------------------------------------------------- |
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125 | 125 | // Instance level |
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126 | 126 | //-------------------------------------------------------------------- |
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127 | 127 | WidgetManager.prototype.display_view = function(msg, model) { |
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128 | 128 | /** |
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129 | 129 | * Displays a view for a particular model. |
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130 | 130 | */ |
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131 | 131 | var cell = this.get_msg_cell(msg.parent_header.msg_id); |
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132 | 132 | if (cell === null) { |
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133 | 133 | return Promise.reject(new Error("Could not determine where the display" + |
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134 | 134 | " message was from. Widget will not be displayed")); |
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135 | 135 | } else { |
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136 | 136 | return this.display_view_in_cell(cell, model) |
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137 | 137 | .catch(utils.reject('Could not display view', true)); |
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138 | 138 | } |
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139 | 139 | }; |
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140 | 140 | |
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141 | 141 | WidgetManager.prototype.display_view_in_cell = function(cell, model) { |
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142 | 142 | // Displays a view in a cell. |
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143 | 143 | if (cell.display_widget_view) { |
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144 | 144 | var that = this; |
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145 | 145 | return cell.display_widget_view(this.create_view(model, { |
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146 | 146 | cell: cell, |
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147 | 147 | // Only set cell_index when view is displayed as directly. |
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148 | 148 | cell_index: that.notebook.find_cell_index(cell), |
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149 | 149 | })).then(function(view) { |
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150 | 150 | that._handle_display_view(view); |
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151 | 151 | view.trigger('displayed'); |
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152 | 152 | return view; |
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153 | 153 | }).catch(utils.reject('Could not create or display view', true)); |
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154 | 154 | } else { |
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155 | 155 | return Promise.reject(new Error('Cell does not have a `display_widget_view` method')); |
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156 | 156 | } |
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157 | 157 | }; |
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158 | 158 | |
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159 | 159 | WidgetManager.prototype._handle_display_view = function (view) { |
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160 | 160 | /** |
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161 | 161 | * Have the IPython keyboard manager disable its event |
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162 | 162 | * handling so the widget can capture keyboard input. |
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163 | 163 | * Note, this is only done on the outer most widgets. |
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164 | 164 | */ |
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165 | 165 | if (this.keyboard_manager) { |
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166 | 166 | this.keyboard_manager.register_events(view.$el); |
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167 | 167 | |
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168 | 168 | if (view.additional_elements) { |
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169 | 169 | for (var i = 0; i < view.additional_elements.length; i++) { |
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170 | 170 | this.keyboard_manager.register_events(view.additional_elements[i]); |
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171 | 171 | } |
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172 | 172 | } |
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173 | 173 | } |
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174 | 174 | }; |
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175 | 175 | |
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176 | 176 | WidgetManager.prototype.create_view = function(model, options) { |
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177 | 177 | /** |
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178 | 178 | * Creates a promise for a view of a given model |
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179 | 179 | * |
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180 | 180 | * Make sure the view creation is not out of order with |
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181 | 181 | * any state updates. |
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182 | 182 | */ |
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183 | 183 | model.state_change = model.state_change.then(function() { |
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184 | 184 | |
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185 | 185 | return utils.load_class(model.get('_view_name'), model.get('_view_module'), |
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186 | 186 | WidgetManager._view_types).then(function(ViewType) { |
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187 | 187 | |
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188 | 188 | // If a view is passed into the method, use that view's cell as |
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189 | 189 | // the cell for the view that is created. |
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190 | 190 | options = options || {}; |
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191 | 191 | if (options.parent !== undefined) { |
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192 | 192 | options.cell = options.parent.options.cell; |
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193 | 193 | } |
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194 | 194 | // Create and render the view... |
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195 | 195 | var parameters = {model: model, options: options}; |
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196 | 196 | var view = new ViewType(parameters); |
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197 | 197 | view.listenTo(model, 'destroy', view.remove); |
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198 | 198 | return Promise.resolve(view.render()).then(function() {return view;}); |
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199 | 199 | }).catch(utils.reject("Couldn't create a view for model id '" + String(model.id) + "'", true)); |
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200 | 200 | }); |
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201 | 201 | var id = utils.uuid(); |
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202 | 202 | model.views[id] = model.state_change; |
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203 | 203 | model.state_change.then(function(view) { |
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204 | 204 | view.once('remove', function() { |
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205 | 205 | delete view.model.views[id]; |
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206 | 206 | }, this); |
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207 | 207 | }); |
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208 | 208 | return model.state_change; |
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209 | 209 | }; |
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210 | 210 | |
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211 | 211 | WidgetManager.prototype.get_msg_cell = function (msg_id) { |
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212 | 212 | var cell = null; |
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213 | 213 | // First, check to see if the msg was triggered by cell execution. |
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214 | 214 | if (this.notebook) { |
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215 | 215 | cell = this.notebook.get_msg_cell(msg_id); |
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216 | 216 | } |
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217 | 217 | if (cell !== null) { |
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218 | 218 | return cell; |
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219 | 219 | } |
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220 | 220 | // Second, check to see if a get_cell callback was defined |
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221 | 221 | // for the message. get_cell callbacks are registered for |
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222 | 222 | // widget messages, so this block is actually checking to see if the |
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223 | 223 | // message was triggered by a widget. |
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224 | 224 | var kernel = this.comm_manager.kernel; |
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225 | 225 | if (kernel) { |
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226 | 226 | var callbacks = kernel.get_callbacks_for_msg(msg_id); |
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227 | 227 | if (callbacks && callbacks.iopub && |
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228 | 228 | callbacks.iopub.get_cell !== undefined) { |
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229 | 229 | return callbacks.iopub.get_cell(); |
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230 | 230 | } |
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231 | 231 | } |
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232 | 232 | |
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233 | 233 | // Not triggered by a cell or widget (no get_cell callback |
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234 | 234 | // exists). |
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235 | 235 | return null; |
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236 | 236 | }; |
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237 | 237 | |
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238 | 238 | WidgetManager.prototype.callbacks = function (view) { |
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239 | 239 | /** |
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240 | 240 | * callback handlers specific a view |
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241 | 241 | */ |
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242 | 242 | var callbacks = {}; |
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243 | 243 | if (view && view.options.cell) { |
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244 | 244 | |
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245 | 245 | // Try to get output handlers |
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246 | 246 | var cell = view.options.cell; |
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247 | 247 | var handle_output = null; |
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248 | 248 | var handle_clear_output = null; |
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249 | 249 | if (cell.output_area) { |
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250 | 250 | handle_output = $.proxy(cell.output_area.handle_output, cell.output_area); |
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251 | 251 | handle_clear_output = $.proxy(cell.output_area.handle_clear_output, cell.output_area); |
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252 | 252 | } |
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253 | 253 | |
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254 | 254 | // Create callback dictionary using what is known |
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255 | 255 | var that = this; |
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256 | 256 | callbacks = { |
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257 | 257 | iopub : { |
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258 | 258 | output : handle_output, |
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259 | 259 | clear_output : handle_clear_output, |
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260 | 260 | |
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261 | 261 | // Special function only registered by widget messages. |
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262 | 262 | // Allows us to get the cell for a message so we know |
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263 | 263 | // where to add widgets if the code requires it. |
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264 | 264 | get_cell : function () { |
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265 | 265 | return cell; |
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266 | 266 | }, |
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267 | 267 | }, |
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268 | 268 | }; |
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269 | 269 | } |
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270 | 270 | return callbacks; |
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271 | 271 | }; |
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272 | 272 | |
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273 | 273 | WidgetManager.prototype.get_model = function (model_id) { |
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274 | 274 | /** |
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275 | 275 | * Get a promise for a model by model id. |
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276 | 276 | */ |
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277 | 277 | return this._models[model_id]; |
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278 | 278 | }; |
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279 | 279 | |
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280 | 280 | WidgetManager.prototype._handle_comm_open = function (comm, msg) { |
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281 | 281 | /** |
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282 | 282 | * Handle when a comm is opened. |
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283 | 283 | */ |
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284 | 284 | return this.create_model({ |
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285 | 285 |
model_name: msg.content.data.model_name, |
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286 | 286 |
model_module: msg.content.data.model_module, |
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287 | comm: comm}).catch(utils.reject("Couldn't create a model.", true)); | |
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287 | comm: comm, | |
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288 | }).catch(utils.reject("Couldn't create a model.", true)); | |
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288 | 289 | }; |
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289 | 290 | |
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290 | 291 | WidgetManager.prototype.create_model = function (options) { |
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291 | 292 | /** |
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292 | 293 | * Create and return a promise for a new widget model |
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293 | 294 | * |
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294 | 295 | * Minimally, one must provide the model_name and widget_class |
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295 | 296 | * parameters to create a model from Javascript. |
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296 | 297 | * |
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297 | 298 | * Example |
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298 | 299 | * -------- |
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299 | 300 | * JS: |
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300 | 301 | * IPython.notebook.kernel.widget_manager.create_model({ |
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301 | 302 |
* model_name: 'WidgetModel', |
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302 |
* widget_class: 'IPython.html.widgets.widget_int.IntSlider' |
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303 | * widget_class: 'IPython.html.widgets.widget_int.IntSlider' | |
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304 | * }) | |
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303 | 305 |
* |
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304 | 306 |
* |
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305 | 307 | * |
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306 | 308 | * Parameters |
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307 | 309 | * ---------- |
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308 | 310 | * options: dictionary |
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309 | 311 | * Dictionary of options with the following contents: |
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310 | 312 | * model_name: string |
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311 | 313 | * Target name of the widget model to create. |
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312 | 314 | * model_module: (optional) string |
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313 | 315 | * Module name of the widget model to create. |
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314 | 316 | * widget_class: (optional) string |
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315 | 317 | * Target name of the widget in the back-end. |
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316 | 318 | * comm: (optional) Comm |
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317 | 319 | * |
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318 | 320 | * Create a comm if it wasn't provided. |
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319 | 321 | */ |
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320 | 322 | var comm = options.comm; |
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321 | 323 | if (!comm) { |
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322 | 324 | comm = this.comm_manager.new_comm('ipython.widget', {'widget_class': options.widget_class}); |
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323 | 325 | } |
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324 | 326 | |
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325 | 327 | var that = this; |
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326 | 328 | var model_id = comm.comm_id; |
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327 | 329 | var model_promise = utils.load_class(options.model_name, options.model_module, WidgetManager._model_types) |
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328 | 330 | .then(function(ModelType) { |
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329 | 331 | var widget_model = new ModelType(that, model_id, comm); |
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330 | 332 | widget_model.once('comm:close', function () { |
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331 | 333 | delete that._models[model_id]; |
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332 | 334 | }); |
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333 | 335 | widget_model.name = options.model_name; |
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334 | 336 | widget_model.module = options.model_module; |
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335 | 337 | return widget_model; |
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336 | 338 | |
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337 | 339 | }, function(error) { |
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338 | 340 | delete that._models[model_id]; |
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339 | 341 | var wrapped_error = new utils.WrappedError("Couldn't create model", error); |
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340 | 342 | return Promise.reject(wrapped_error); |
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341 | 343 | }); |
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342 | 344 | this._models[model_id] = model_promise; |
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343 | 345 | return model_promise; |
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344 | 346 | }; |
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345 | 347 | |
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346 | 348 | WidgetManager.prototype.get_state = function(options) { |
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347 | 349 | /** |
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348 | 350 | * Asynchronously get the state of the widget manager. |
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349 | 351 | * |
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350 | 352 | * This includes all of the widget models and the cells that they are |
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351 | 353 | * displayed in. |
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352 | 354 | * |
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353 | 355 | * Parameters |
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354 | 356 | * ---------- |
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355 | 357 | * options: dictionary |
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356 | 358 | * Dictionary of options with the following contents: |
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357 | 359 | * only_displayed: (optional) boolean=false |
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358 | 360 | * Only return models with one or more displayed views. |
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359 | 361 | * not_live: (optional) boolean=false |
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360 | 362 | * Include models that have comms with severed connections. |
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361 | 363 | * |
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362 | 364 | * Returns |
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363 | 365 | * ------- |
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364 | 366 | * Promise for a state dictionary |
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365 | 367 | */ |
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366 | 368 | var that = this; |
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367 | 369 | return utils.resolve_promises_dict(this._models).then(function(models) { |
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368 | 370 | var state = {}; |
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369 | 371 | |
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370 | 372 | var model_promises = []; |
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371 | 373 | for (var model_id in models) { |
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372 | 374 | if (models.hasOwnProperty(model_id)) { |
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373 | 375 | var model = models[model_id]; |
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374 | 376 | |
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375 | 377 | // If the model has one or more views defined for it, |
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376 | 378 | // consider it displayed. |
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377 | 379 | var displayed_flag = !(options && options.only_displayed) || Object.keys(model.views).length > 0; |
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378 | 380 | var live_flag = (options && options.not_live) || model.comm_live; |
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379 | 381 | if (displayed_flag && live_flag) { |
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380 | 382 | state[model_id] = { |
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381 | 383 | model_name: model.name, |
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382 | 384 | model_module: model.module, |
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383 | 385 | state: model.get_state(), |
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384 | 386 | views: [], |
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385 | 387 | }; |
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386 | 388 | |
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387 | 389 | // Get the views that are displayed *now*. |
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388 | 390 | (function(local_state) { |
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389 | 391 | model_promises.push(utils.resolve_promises_dict(model.views).then(function(model_views) { |
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390 | 392 | for (var id in model_views) { |
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391 | 393 | if (model_views.hasOwnProperty(id)) { |
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392 | 394 | var view = model_views[id]; |
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393 | 395 | if (view.options.cell_index) { |
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394 | 396 | local_state.views.push(view.options.cell_index); |
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395 | 397 | } |
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396 | 398 | } |
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397 | 399 | } |
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398 | 400 | })); |
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399 | 401 | })(state[model_id]); |
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400 | 402 | } |
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401 | 403 | } |
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402 | 404 | } |
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403 | 405 | return Promise.all(model_promises).then(function() { return state; }); |
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404 | 406 | }).catch(utils.reject('Could not get state of widget manager', true)); |
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405 | 407 | }; |
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406 | 408 | |
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407 | 409 | WidgetManager.prototype.set_state = function(state) { |
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408 | 410 | /** |
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409 | 411 | * Set the notebook's state. |
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410 | 412 | * |
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411 | 413 | * Reconstructs all of the widget models and attempts to redisplay the |
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412 | 414 | * widgets in the appropriate cells by cell index. |
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413 | 415 | */ |
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414 | 416 | |
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415 | 417 | // Get the kernel when it's available. |
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416 | 418 | var that = this; |
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417 | 419 | return this._get_connected_kernel().then(function(kernel) { |
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418 | 420 | |
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419 |
// Recreate all the widget models for the given |
|
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420 | // display the views. | |
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421 | that.all_views = []; | |
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422 | var model_ids = Object.keys(state); | |
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423 | for (var i = 0; i < model_ids.length; i++) { | |
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424 | var model_id = model_ids[i]; | |
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425 | ||
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421 | // Recreate all the widget models for the given notebook state. | |
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422 | var all_models = Promise.all(_.map(Object.keys(state), function (model_id) { | |
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426 | 423 | // Recreate a comm using the widget's model id (model_id == comm_id). |
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427 | 424 | var new_comm = new comm.Comm(kernel.widget_manager.comm_target_name, model_id); |
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428 | 425 | kernel.comm_manager.register_comm(new_comm); |
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429 | 426 | |
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430 | 427 | // Create the model using the recreated comm. When the model is |
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431 | 428 | // created we don't know yet if the comm is valid so set_comm_live |
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432 | 429 | // false. Once we receive the first state push from the back-end |
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433 | 430 | // we know the comm is alive. |
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434 |
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431 | return kernel.widget_manager.create_model({ | |
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435 | 432 |
comm: new_comm, |
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436 | 433 |
model_name: state[model_id].model_name, |
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437 |
model_module: state[model_id].model_module |
|
|
438 | .then(function(model) { | |
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439 | ||
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434 | model_module: state[model_id].model_module, | |
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435 | }).then(function(model) { | |
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440 | 436 | model.set_comm_live(false); |
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441 | var view_promise = Promise.resolve().then(function() { | |
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442 |
|
|
|
443 | }).then(function() { | |
|
444 | model.request_state().then(function() { | |
|
437 | model.set_state(state[model.id].state); | |
|
438 | return model.request_state().then(function() { | |
|
445 | 439 |
|
|
440 | return model; | |
|
446 | 441 |
|
|
442 | }); | |
|
443 | }, this)); | |
|
447 | 444 | |
|
445 | // Display all the views | |
|
446 | return all_models.then(function(models) { | |
|
447 | return Promise.all(_.map(models, function(model) { | |
|
448 | 448 |
|
|
449 | var views = []; | |
|
450 | var model_views = state[model.id].views; | |
|
451 | for (var j=0; j<model_views.length; j++) { | |
|
452 | var cell_index = model_views[j]; | |
|
449 | return Promise.all(_.map(state[model.id].views, function(cell_index) { | |
|
453 | 450 |
|
|
454 |
|
|
|
455 |
|
|
|
456 | return Promise.all(views); | |
|
457 | }); | |
|
458 | return view_promise; | |
|
451 | return that.display_view_in_cell(cell, model); | |
|
452 | })); | |
|
453 | })); | |
|
459 | 454 |
|
|
460 | that.all_views.push(views); | |
|
461 | } | |
|
462 | return Promise.all(that.all_views); | |
|
463 | 455 |
}).catch(utils.reject('Could not set widget manager state.', true)); |
|
464 | 456 | }; |
|
465 | 457 | |
|
466 | 458 | WidgetManager.prototype._get_connected_kernel = function() { |
|
467 | 459 | /** |
|
468 | 460 | * Gets a promise for a connected kernel |
|
469 | 461 | */ |
|
470 | 462 | var that = this; |
|
471 | 463 | return new Promise(function(resolve, reject) { |
|
472 | 464 |
if (that.comm_manager && |
|
473 | 465 |
that.comm_manager.kernel && |
|
474 | 466 | that.comm_manager.kernel.is_connected()) { |
|
475 | 467 | |
|
476 | 468 | resolve(that.comm_manager.kernel); |
|
477 | 469 | } else { |
|
478 | 470 | that.notebook.events.on('kernel_connected.Kernel', function(event, data) { |
|
479 | 471 | resolve(data.kernel); |
|
480 | 472 | }); |
|
481 | 473 |
} |
|
482 | 474 | }); |
|
483 | 475 | }; |
|
484 | 476 | |
|
485 | 477 | // Backwards compatibility. |
|
486 | 478 | IPython.WidgetManager = WidgetManager; |
|
487 | 479 | |
|
488 | 480 | return {'WidgetManager': WidgetManager}; |
|
489 | 481 | }); |
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