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1 | 1 | //---------------------------------------------------------------------------- |
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2 | 2 | // Copyright (C) 2013 The IPython Development Team |
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3 | 3 | // |
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4 | 4 | // Distributed under the terms of the BSD License. The full license is in |
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5 | 5 | // the file COPYING, distributed as part of this software. |
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6 | 6 | //---------------------------------------------------------------------------- |
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7 | 7 | |
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8 | 8 | //============================================================================ |
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9 | 9 | // WidgetModel, WidgetView, and WidgetManager |
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10 | 10 | //============================================================================ |
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11 | 11 | /** |
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12 | 12 | * Base Widget classes |
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13 | 13 | * @module IPython |
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14 | 14 | * @namespace IPython |
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15 | 15 | * @submodule widget |
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16 | 16 | */ |
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17 | 17 | |
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18 | 18 | (function () { |
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19 | 19 | "use strict"; |
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20 | 20 | |
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21 | 21 | // Use require.js 'define' method so that require.js is intelligent enough to |
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22 | 22 | // syncronously load everything within this file when it is being 'required' |
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23 | 23 | // elsewhere. |
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24 | 24 | define(["underscore", |
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25 | 25 | "backbone", |
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26 | 26 | ], function (Underscore, Backbone) { |
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27 | 27 | |
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28 | 28 | //-------------------------------------------------------------------- |
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29 | 29 | // WidgetManager class |
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30 | 30 | //-------------------------------------------------------------------- |
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31 | 31 | var WidgetManager = function (comm_manager) { |
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32 | 32 | // Public constructor |
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33 | 33 | WidgetManager._managers.push(this); |
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34 | 34 | |
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35 | 35 | // Attach a comm manager to the |
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36 | 36 | this.comm_manager = comm_manager; |
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37 | 37 | this._models = {}; /* Dictionary of model ids and model instances */ |
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38 | 38 | |
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39 | 39 | // Register already-registered widget model types with the comm manager. |
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40 | 40 | var that = this; |
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41 | 41 | _.each(WidgetManager._model_types, function(model_type, model_name) { |
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42 | 42 | that.comm_manager.register_target(model_name, $.proxy(that._handle_comm_open, that)); |
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43 | 43 | }); |
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44 | 44 | }; |
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45 | 45 | |
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46 | 46 | //-------------------------------------------------------------------- |
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47 | 47 | // Class level |
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48 | 48 | //-------------------------------------------------------------------- |
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49 | 49 | WidgetManager._model_types = {}; /* Dictionary of model type names (target_name) and model types. */ |
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50 | 50 | WidgetManager._view_types = {}; /* Dictionary of view names and view types. */ |
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51 | 51 | WidgetManager._managers = []; /* List of widget managers */ |
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52 | 52 | |
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53 | 53 | WidgetManager.register_widget_model = function (model_name, model_type) { |
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54 | 54 | // Registers a widget model by name. |
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55 | 55 | WidgetManager._model_types[model_name] = model_type; |
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56 | 56 | |
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57 | 57 | // Register the widget with the comm manager. Make sure to pass this object's context |
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58 | 58 | // in so `this` works in the call back. |
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59 | 59 | _.each(WidgetManager._managers, function(instance, i) { |
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60 | 60 | if (instance.comm_manager !== null) { |
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61 | 61 | instance.comm_manager.register_target(model_name, $.proxy(instance._handle_comm_open, instance)); |
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62 | 62 | } |
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63 | 63 | }); |
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64 | 64 | }; |
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65 | 65 | |
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66 | 66 | WidgetManager.register_widget_view = function (view_name, view_type) { |
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67 | 67 | // Registers a widget view by name. |
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68 | 68 | WidgetManager._view_types[view_name] = view_type; |
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69 | 69 | }; |
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70 | 70 | |
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71 | 71 | //-------------------------------------------------------------------- |
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72 | 72 | // Instance level |
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73 | 73 | //-------------------------------------------------------------------- |
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74 | 74 | WidgetManager.prototype.display_view = function(msg, model) { |
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75 | 75 | // Displays a view for a particular model. |
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76 | 76 | var cell = this.get_msg_cell(msg.parent_header.msg_id); |
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77 | 77 | if (cell === null) { |
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78 | 78 | console.log("Could not determine where the display" + |
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79 | 79 | " message was from. Widget will not be displayed"); |
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80 | 80 | } else { |
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81 | 81 | var view = this.create_view(model, {cell: cell}); |
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82 | 82 | if (view === null) { |
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83 | 83 | console.error("View creation failed", model); |
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84 | 84 | } |
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85 | 85 | if (cell.widget_subarea) { |
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86 | 86 | |
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87 | 87 | cell.widget_area.show(); |
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88 | // Have the IPython keyboard manager disable its event | |
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89 | // handling so the widget can capture keyboard input. | |
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90 | // Note, this is only done on the outer most widget. | |
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91 | IPython.keyboard_manager.register_events(view.$el); | |
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88 | 92 | cell.widget_subarea.append(view.$el); |
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89 | 93 | } |
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90 | 94 | } |
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91 | 95 | }; |
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92 | 96 | |
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93 | 97 | WidgetManager.prototype.create_view = function(model, options, view) { |
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94 | 98 | // Creates a view for a particular model. |
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95 | 99 | var view_name = model.get('_view_name'); |
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96 | 100 | var ViewType = WidgetManager._view_types[view_name]; |
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97 | 101 | if (ViewType) { |
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98 | 102 | |
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99 | 103 | // If a view is passed into the method, use that view's cell as |
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100 | 104 | // the cell for the view that is created. |
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101 | 105 | options = options || {}; |
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102 | 106 | if (view !== undefined) { |
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103 | 107 | options.cell = view.options.cell; |
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104 | 108 | } |
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105 | 109 | |
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106 | 110 | // Create and render the view... |
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107 | 111 | var parameters = {model: model, options: options}; |
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108 | 112 | view = new ViewType(parameters); |
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109 | 113 | view.render(); |
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110 | 114 | model.views.push(view); |
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111 | 115 | model.on('destroy', view.remove, view); |
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112 | 116 | |
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113 | 117 | this._handle_new_view(view); |
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114 | 118 | return view; |
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115 | 119 | } |
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116 | 120 | return null; |
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117 | 121 | }; |
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118 | 122 | |
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119 | 123 | WidgetManager.prototype._handle_new_view = function (view) { |
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120 | 124 | // Called when a view has been created and rendered. |
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121 | ||
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122 | // If the view has a well defined element, inform the keyboard | |
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123 | // manager about the view's element, so as the element can | |
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124 | // escape the dreaded command mode. | |
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125 | if (view.$el) { | |
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126 | IPython.keyboard_manager.register_events(view.$el); | |
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127 | } | |
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128 | 125 | }; |
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129 | 126 | |
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130 | 127 | WidgetManager.prototype.get_msg_cell = function (msg_id) { |
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131 | 128 | var cell = null; |
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132 | 129 | // First, check to see if the msg was triggered by cell execution. |
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133 | 130 | if (IPython.notebook) { |
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134 | 131 | cell = IPython.notebook.get_msg_cell(msg_id); |
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135 | 132 | } |
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136 | 133 | if (cell !== null) { |
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137 | 134 | return cell; |
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138 | 135 | } |
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139 | 136 | // Second, check to see if a get_cell callback was defined |
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140 | 137 | // for the message. get_cell callbacks are registered for |
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141 | 138 | // widget messages, so this block is actually checking to see if the |
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142 | 139 | // message was triggered by a widget. |
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143 | 140 | var kernel = this.comm_manager.kernel; |
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144 | 141 | if (kernel) { |
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145 | 142 | var callbacks = kernel.get_callbacks_for_msg(msg_id); |
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146 | 143 | if (callbacks && callbacks.iopub && |
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147 | 144 | callbacks.iopub.get_cell !== undefined) { |
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148 | 145 | return callbacks.iopub.get_cell(); |
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149 | 146 | } |
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150 | 147 | } |
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151 | 148 | |
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152 | 149 | // Not triggered by a cell or widget (no get_cell callback |
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153 | 150 | // exists). |
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154 | 151 | return null; |
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155 | 152 | }; |
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156 | 153 | |
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157 | 154 | WidgetManager.prototype.callbacks = function (view) { |
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158 | 155 | // callback handlers specific a view |
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159 | 156 | var callbacks = {}; |
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160 | 157 | if (view && view.options.cell) { |
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161 | 158 | |
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162 | 159 | // Try to get output handlers |
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163 | 160 | var cell = view.options.cell; |
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164 | 161 | var handle_output = null; |
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165 | 162 | var handle_clear_output = null; |
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166 | 163 | if (cell.output_area) { |
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167 | 164 | handle_output = $.proxy(cell.output_area.handle_output, cell.output_area); |
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168 | 165 | handle_clear_output = $.proxy(cell.output_area.handle_clear_output, cell.output_area); |
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169 | 166 | } |
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170 | 167 | |
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171 | 168 | // Create callback dict using what is known |
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172 | 169 | var that = this; |
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173 | 170 | callbacks = { |
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174 | 171 | iopub : { |
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175 | 172 | output : handle_output, |
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176 | 173 | clear_output : handle_clear_output, |
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177 | 174 | |
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178 | 175 | // Special function only registered by widget messages. |
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179 | 176 | // Allows us to get the cell for a message so we know |
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180 | 177 | // where to add widgets if the code requires it. |
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181 | 178 | get_cell : function () { |
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182 | 179 | return cell; |
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183 | 180 | }, |
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184 | 181 | }, |
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185 | 182 | }; |
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186 | 183 | } |
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187 | 184 | return callbacks; |
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188 | 185 | }; |
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189 | 186 | |
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190 | 187 | WidgetManager.prototype.get_model = function (model_id) { |
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191 | 188 | // Look-up a model instance by its id. |
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192 | 189 | var model = this._models[model_id]; |
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193 | 190 | if (model !== undefined && model.id == model_id) { |
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194 | 191 | return model; |
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195 | 192 | } |
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196 | 193 | return null; |
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197 | 194 | }; |
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198 | 195 | |
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199 | 196 | WidgetManager.prototype._handle_comm_open = function (comm, msg) { |
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200 | 197 | // Handle when a comm is opened. |
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201 | 198 | var model_id = comm.comm_id; |
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202 | 199 | var widget_type_name = msg.content.target_name; |
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203 | 200 | var widget_model = new WidgetManager._model_types[widget_type_name](this, model_id, comm); |
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204 | 201 | this._models[model_id] = widget_model; |
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205 | 202 | }; |
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206 | 203 | |
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207 | 204 | IPython.WidgetManager = WidgetManager; |
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208 | 205 | return IPython.WidgetManager; |
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209 | 206 | }); |
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210 | 207 | }()); |
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