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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 | "use strict"; |
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19 | 19 | |
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20 | 20 | // Use require.js 'define' method so that require.js is intelligent enough to |
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21 | 21 | // syncronously load everything within this file when it is being 'required' |
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22 | 22 | // elsewhere. |
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23 | 23 | define(["components/underscore/underscore-min", |
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24 | 24 | "components/backbone/backbone-min", |
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25 | 25 | ], function(underscore, backbone){ |
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26 | 26 | |
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27 | 27 | |
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28 | 28 | //-------------------------------------------------------------------- |
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29 | 29 | // WidgetModel class |
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30 | 30 | //-------------------------------------------------------------------- |
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31 | 31 | var WidgetModel = Backbone.Model.extend({ |
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32 | 32 | constructor: function(comm_manager, comm, widget_manager) { |
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33 | 33 | this.comm_manager = comm_manager; |
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34 | 34 | this.widget_manager = widget_manager; |
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35 | 35 | this.pending_msgs = 0; |
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36 | 36 | this.msg_throttle = 3; |
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37 | 37 | this.msg_buffer = null; |
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38 | 38 | this.views = {}; |
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39 | 39 | |
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40 | 40 | // Remember comm associated with the model. |
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41 | 41 | this.comm = comm; |
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42 | 42 | comm.model = this; |
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43 | 43 | |
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44 | 44 | // Hook comm messages up to model. |
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45 | 45 | comm.on_close($.proxy(this._handle_comm_closed, this)); |
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46 | 46 | comm.on_msg($.proxy(this._handle_comm_msg, this)); |
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47 | 47 | |
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48 | 48 | return Backbone.Model.apply(this); |
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49 | 49 | }, |
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50 | 50 | |
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51 | 51 | |
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52 | 52 | update_other_views: function(caller) { |
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53 | 53 | this.last_modified_view = caller; |
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54 | 54 | this.save(this.changedAttributes(), {patch: true}); |
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55 | 55 | |
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56 | 56 | for (var cell in this.views) { |
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57 | 57 | var views = this.views[cell]; |
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58 | 58 | for (var view_index in views) { |
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59 | 59 | var view = views[view_index]; |
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60 | 60 | if (view !== caller) { |
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61 | 61 | view.update(); |
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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 | |
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67 | 67 | |
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68 | on_view_displayed: function (callback) { | |
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69 | this._view_displayed_callback = callback; | |
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70 | } | |
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71 | ||
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72 | ||
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73 | on_close: function (callback) { | |
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74 | this._close_callback = callback; | |
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75 | } | |
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76 | ||
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77 | ||
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68 | 78 | // Handle when a widget is closed. |
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69 | 79 | _handle_comm_closed: function (msg) { |
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70 | 80 | for (var cell in this.views) { |
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71 | 81 | var views = this.views[cell]; |
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72 | 82 | for (var view_index in views) { |
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73 | 83 | var view = views[view_index]; |
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74 | 84 | view.remove(); |
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75 | 85 | } |
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76 | 86 | } |
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77 | 87 | }, |
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78 | 88 | |
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79 | 89 | |
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80 | 90 | // Handle incomming comm msg. |
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81 | 91 | _handle_comm_msg: function (msg) { |
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82 | 92 | var method = msg.content.data.method; |
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83 | 93 | switch (method){ |
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84 | 94 | case 'display': |
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85 | 95 | |
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86 |
// Try to get the cell |
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96 | // Try to get the cell. | |
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87 | 97 | var cell = this._get_msg_cell(msg.parent_header.msg_id); |
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88 | 98 | if (cell == null) { |
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89 | 99 | console.log("Could not determine where the display" + |
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90 | 100 | " message was from. Widget will not be displayed") |
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91 | 101 | } else { |
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92 | 102 | this._display_view(msg.content.data.view_name, |
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93 | 103 | msg.content.data.parent, |
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94 | 104 | cell); |
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95 | 105 | } |
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96 | 106 | break; |
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97 | 107 | case 'update': |
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98 | 108 | this._handle_update(msg.content.data.state); |
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99 | 109 | break; |
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100 | 110 | } |
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101 | 111 | }, |
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102 | 112 | |
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103 | 113 | |
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104 | 114 | // Handle when a widget is updated via the python side. |
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105 | 115 | _handle_update: function (state) { |
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106 | 116 | this.updating = true; |
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107 | 117 | try { |
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108 | 118 | for (var key in state) { |
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109 | 119 | if (state.hasOwnProperty(key)) { |
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110 | 120 | if (key == "_css"){ |
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111 | 121 | |
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112 | 122 | // Set the css value of the model as an attribute |
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113 | 123 | // instead of a backbone trait because we are only |
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114 | 124 | // interested in backend css -> frontend css. In |
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115 | 125 | // other words, if the css dict changes in the |
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116 | 126 | // frontend, we don't need to push the changes to |
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117 | 127 | // the backend. |
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118 | 128 | this.css = state[key]; |
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119 | 129 | } else { |
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120 | 130 | this.set(key, state[key]); |
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121 | 131 | } |
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122 | 132 | } |
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123 | 133 | } |
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124 | 134 | this.id = this.comm.comm_id; |
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125 | 135 | this.save(); |
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126 | 136 | } finally { |
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127 | 137 | this.updating = false; |
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128 | 138 | } |
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129 | 139 | }, |
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130 | 140 | |
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131 | 141 | |
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132 | 142 | _handle_status: function (cell, msg) { |
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133 | 143 | //execution_state : ('busy', 'idle', 'starting') |
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134 | 144 | if (msg.content.execution_state=='idle') { |
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135 | 145 | |
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136 | 146 | // Send buffer if this message caused another message to be |
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137 | 147 | // throttled. |
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138 | 148 | if (this.msg_buffer != null && |
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139 | 149 | this.msg_throttle == this.pending_msgs) { |
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140 | 150 | |
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141 | 151 | var cell = this._get_msg_cell(msg.parent_header.msg_id); |
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142 | 152 | var callbacks = this._make_callbacks(cell); |
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143 | 153 | var data = {sync_method: 'update', sync_data: this.msg_buffer}; |
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144 | 154 | this.comm.send(data, callbacks); |
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145 | 155 | this.msg_buffer = null; |
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146 | 156 | } else { |
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147 | 157 | |
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148 | 158 | // Only decrease the pending message count if the buffer |
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149 | 159 | // doesn't get flushed (sent). |
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150 | 160 | --this.pending_msgs; |
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151 | 161 | } |
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152 | 162 | } |
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153 | 163 | }, |
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154 | 164 | |
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155 | 165 | |
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156 | 166 | // Custom syncronization logic. |
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157 | 167 | _handle_sync: function (method, options) { |
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158 | 168 | var model_json = this.toJSON(); |
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159 | 169 | |
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160 | 170 | // Only send updated state if the state hasn't been changed |
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161 | 171 | // during an update. |
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162 | 172 | if (!this.updating) { |
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163 | 173 | if (this.pending_msgs >= this.msg_throttle) { |
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164 | 174 | // The throttle has been exceeded, buffer the current msg so |
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165 | 175 | // it can be sent once the kernel has finished processing |
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166 | 176 | // some of the existing messages. |
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167 | 177 | if (method=='patch') { |
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168 | 178 | if (this.msg_buffer == null) { |
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169 | 179 | this.msg_buffer = $.extend({}, model_json); // Copy |
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170 | 180 | } |
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171 | 181 | for (var attr in options.attrs) { |
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172 | 182 | this.msg_buffer[attr] = options.attrs[attr]; |
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173 | 183 | } |
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174 | 184 | } else { |
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175 | 185 | this.msg_buffer = $.extend({}, model_json); // Copy |
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176 | 186 | } |
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177 | 187 | |
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178 | 188 | } else { |
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179 | 189 | // We haven't exceeded the throttle, send the message like |
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180 | 190 | // normal. If this is a patch operation, just send the |
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181 | 191 | // changes. |
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182 | 192 | var send_json = model_json; |
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183 | 193 | if (method=='patch') { |
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184 | 194 | send_json = {}; |
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185 | 195 | for (var attr in options.attrs) { |
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186 | 196 | send_json[attr] = options.attrs[attr]; |
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187 | 197 | } |
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188 | 198 | } |
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189 | 199 | |
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190 | 200 | var data = {sync_method: method, sync_data: send_json}; |
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191 | 201 | |
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192 | 202 | var cell = null; |
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193 | 203 | if (this.last_modified_view != undefined && this.last_modified_view != null) { |
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194 | 204 | cell = this.last_modified_view.cell; |
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195 | 205 | } |
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196 | 206 | |
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197 | 207 | var callbacks = this._make_callbacks(cell); |
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198 | 208 | this.comm.send(data, callbacks); |
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199 | 209 | this.pending_msgs++; |
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200 | 210 | } |
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201 | 211 | } |
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202 | 212 | |
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203 | 213 | // Since the comm is a one-way communication, assume the message |
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204 | 214 | // arrived. |
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205 | 215 | return model_json; |
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206 | 216 | }, |
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207 | 217 | |
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208 | 218 | |
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219 | _handle_view_displayed: function(view) { | |
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220 | if (this._view_displayed_callback) { | |
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221 | try { | |
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222 | this._view_displayed_callback(view) | |
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223 | } catch (e) { | |
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224 | console.log("Exception in widget model view displayed callback", e, view, this); | |
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225 | } | |
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226 | } | |
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227 | } | |
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228 | ||
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229 | ||
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209 | 230 | // Create view that represents the model. |
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210 | 231 | _display_view: function (view_name, parent_comm_id, cell) { |
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211 | 232 | var new_views = []; |
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212 | 233 | |
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213 | 234 | // Try creating and adding the view to it's parent. |
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214 | 235 | var displayed = false; |
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215 | 236 | if (parent_comm_id != undefined) { |
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216 | 237 | var parent_comm = this.comm_manager.comms[parent_comm_id]; |
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217 | 238 | var parent_model = parent_comm.model; |
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218 | 239 | var parent_views = parent_model.views[cell]; |
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219 | 240 | for (var parent_view_index in parent_views) { |
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220 | 241 | var parent_view = parent_views[parent_view_index]; |
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221 | 242 | if (parent_view.display_child != undefined) { |
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222 | 243 | var view = this._create_view(view_name, cell); |
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223 | 244 | if (view != null) { |
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224 | 245 | new_views.push(view); |
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225 | 246 | parent_view.display_child(view); |
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226 | 247 | displayed = true; |
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248 | this._handle_view_displayed(view); | |
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227 | 249 | } |
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228 | 250 | } |
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229 | 251 | } |
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230 | 252 | } |
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231 | 253 | |
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232 | 254 | // If no parent view is defined or exists. Add the view's |
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233 | 255 | // element to cell's widget div. |
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234 | 256 | if (!displayed) { |
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235 | 257 | var view = this._create_view(view_name, cell); |
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236 | 258 | if (view != null) { |
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237 | 259 | new_views.push(view); |
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238 | 260 | |
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239 | 261 | if (cell.widget_subarea != undefined && cell.widget_subarea != null) { |
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240 | 262 | cell.widget_area.show(); |
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241 | 263 | cell.widget_subarea.append(view.$el); |
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264 | this._handle_view_displayed(view); | |
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242 | 265 | } |
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243 | 266 | } |
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244 | 267 | } |
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245 | 268 | |
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246 | 269 | // Force the new view(s) to update their selves |
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247 | 270 | for (var view_index in new_views) { |
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248 | 271 | var view = new_views[view_index]; |
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249 | 272 | view.update(); |
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250 | 273 | } |
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251 | 274 | }, |
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252 | 275 | |
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253 | 276 | |
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254 | 277 | // Create a view |
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255 | 278 | _create_view: function (view_name, cell) { |
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256 | 279 | var view_type = this.widget_manager.widget_view_types[view_name]; |
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257 | 280 | if (view_type != undefined && view_type != null) { |
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258 | 281 | var view = new view_type({model: this}); |
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259 | 282 | view.render(); |
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260 | 283 | if (this.views[cell]==undefined) { |
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261 | 284 | this.views[cell] = [] |
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262 | 285 | } |
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263 | 286 | this.views[cell].push(view); |
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264 | 287 | view.cell = cell; |
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265 | 288 | |
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266 | 289 | // Handle when the view element is remove from the page. |
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267 | 290 | var that = this; |
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268 | 291 | view.$el.on("remove", function(){ |
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269 | 292 | var index = that.views[cell].indexOf(view); |
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270 | 293 | if (index > -1) { |
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271 | 294 | that.views[cell].splice(index, 1); |
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272 | 295 | } |
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273 | 296 | view.remove(); // Clean-up view |
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274 | 297 | if (that.views[cell].length()==0) { |
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275 | 298 | delete that.views[cell]; |
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276 | 299 | } |
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277 | 300 | |
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278 | 301 | // Close the comm if there are no views left. |
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279 | 302 | if (that.views.length()==0) { |
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303 | if (that._close_callback) { | |
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304 | try { | |
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305 | that._close_callback(that) | |
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306 | } catch (e) { | |
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307 | console.log("Exception in widget model close callback", e, that); | |
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308 | } | |
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309 | } | |
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280 | 310 | that.comm.close(); |
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281 | 311 | } |
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282 | 312 | }); |
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283 | 313 | return view; |
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284 | 314 | } |
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285 | 315 | return null; |
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286 | 316 | }, |
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287 | 317 | |
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288 | 318 | |
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289 | 319 | // Build a callback dict. |
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290 | 320 | _make_callbacks: function (cell) { |
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291 | 321 | var callbacks = {}; |
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292 | 322 | if (cell != null && cell.output_area != undefined && cell.output_area != null) { |
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293 | 323 | var that = this; |
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294 | 324 | callbacks = { |
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295 | 325 | iopub : { |
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296 | 326 | output : $.proxy(cell.output_area.handle_output, cell.output_area), |
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297 | 327 | clear_output : $.proxy(cell.output_area.handle_clear_output, cell.output_area), |
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298 | 328 | status : function(msg){ |
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299 | 329 | that._handle_status(cell, msg); |
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300 | 330 | }, |
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301 | 331 | |
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302 | 332 | // Special function only registered by widget messages. |
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303 | 333 | // Allows us to get the cell for a message so we know |
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304 | 334 | // where to add widgets if the code requires it. |
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305 | 335 | get_cell : function() { |
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306 | 336 | if (that.last_modified_view != undefined && |
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307 | 337 | that.last_modified_view.cell != undefined) { |
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308 | 338 | return that.last_modified_view.cell; |
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309 | 339 | } else { |
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310 | 340 | return null |
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311 | 341 | } |
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312 | 342 | }, |
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313 | 343 | }, |
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314 | 344 | }; |
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315 | 345 | } |
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316 | 346 | return callbacks; |
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317 | 347 | }, |
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318 | 348 | |
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319 | 349 | |
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320 | 350 | // Get the output area corresponding to the msg_id. |
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321 | 351 | // cell is an instance of IPython.Cell |
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322 | 352 | _get_msg_cell: function (msg_id) { |
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323 | 353 | |
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324 | 354 | // First, check to see if the msg was triggered by cell execution. |
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325 | 355 | var cell = this.widget_manager.get_msg_cell(msg_id); |
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326 | 356 | if (cell != null) { |
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327 | 357 | return cell; |
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328 | 358 | } |
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329 | 359 | |
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330 | 360 | // Second, check to see if a get_cell callback was defined |
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331 | 361 | // for the message. get_cell callbacks are registered for |
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332 | 362 | // widget messages, so this block is actually checking to see if the |
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333 | 363 | // message was triggered by a widget. |
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334 | 364 | var kernel = this.comm_manager.kernel; |
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335 | 365 | var callbacks = kernel.get_callbacks_for_msg(msg_id); |
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336 | 366 | if (callbacks != undefined && |
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337 | 367 | callbacks.iopub != undefined && |
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338 | 368 | callbacks.iopub.get_cell != undefined) { |
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339 | 369 | |
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340 | 370 | return callbacks.iopub.get_cell(); |
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341 | 371 | } |
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342 | 372 | |
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343 | 373 | // Not triggered by a cell or widget (no get_cell callback |
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344 | 374 | // exists). |
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345 | 375 | return null; |
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346 | 376 | }, |
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347 | 377 | |
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348 | 378 | }); |
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349 | 379 | |
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350 | 380 | |
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351 | 381 | //-------------------------------------------------------------------- |
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352 | 382 | // WidgetView class |
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353 | 383 | //-------------------------------------------------------------------- |
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354 | 384 | var WidgetView = Backbone.View.extend({ |
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355 | 385 | |
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356 | 386 | initialize: function() { |
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357 | 387 | this.visible = true; |
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358 | 388 | this.model.on('change',this.update,this); |
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359 | 389 | this._add_class_calls = this.model.get('_add_class')[0]; |
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360 | 390 | this._remove_class_calls = this.model.get('_remove_class')[0]; |
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361 | 391 | }, |
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362 | 392 | |
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363 | 393 | update: function() { |
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364 | 394 | if (this.model.get('visible') != undefined) { |
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365 | 395 | if (this.visible != this.model.get('visible')) { |
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366 | 396 | this.visible = this.model.get('visible'); |
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367 | 397 | if (this.visible) { |
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368 | 398 | this.$el.show(); |
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369 | 399 | } else { |
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370 | 400 | this.$el.hide(); |
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371 | 401 | } |
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372 | 402 | } |
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373 | 403 | } |
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374 | 404 | |
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375 | 405 | if (this.model.css != undefined) { |
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376 | 406 | for (var selector in this.model.css) { |
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377 | 407 | if (this.model.css.hasOwnProperty(selector)) { |
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378 | 408 | |
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379 | 409 | // Apply the css traits to all elements that match the selector. |
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380 | 410 | var elements = this._get_selector_element(selector); |
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381 | 411 | if (elements.length > 0) { |
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382 | 412 | var css_traits = this.model.css[selector]; |
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383 | 413 | for (var css_key in css_traits) { |
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384 | 414 | if (css_traits.hasOwnProperty(css_key)) { |
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385 | 415 | elements.css(css_key, css_traits[css_key]); |
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386 | 416 | } |
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387 | 417 | } |
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388 | 418 | } |
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389 | 419 | } |
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390 | 420 | } |
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391 | 421 | } |
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392 | 422 | |
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393 | 423 | var add_class = this.model.get('_add_class'); |
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394 | 424 | if (add_class != undefined){ |
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395 | 425 | var add_class_calls = add_class[0]; |
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396 | 426 | if (add_class_calls > this._add_class_calls) { |
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397 | 427 | this._add_class_calls = add_class_calls; |
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398 | 428 | var elements = this._get_selector_element(add_class[1]); |
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399 | 429 | if (elements.length > 0) { |
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400 | 430 | elements.addClass(add_class[2]); |
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401 | 431 | } |
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402 | 432 | } |
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403 | 433 | } |
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404 | 434 | |
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405 | 435 | var remove_class = this.model.get('_remove_class'); |
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406 | 436 | if (remove_class != undefined){ |
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407 | 437 | var remove_class_calls = remove_class[0]; |
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408 | 438 | if (remove_class_calls > this._remove_class_calls) { |
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409 | 439 | this._remove_class_calls = remove_class_calls; |
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410 | 440 | var elements = this._get_selector_element(remove_class[1]); |
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411 | 441 | if (elements.length > 0) { |
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412 | 442 | elements.removeClass(remove_class[2]); |
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413 | 443 | } |
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414 | 444 | } |
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415 | 445 | } |
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416 | 446 | }, |
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417 | 447 | |
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418 | 448 | _get_selector_element: function(selector) { |
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419 | 449 | // Get the elements via the css selector. If the selector is |
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420 | 450 | // blank, apply the style to the $el_to_style element. If |
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421 | 451 | // the $el_to_style element is not defined, use apply the |
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422 | 452 | // style to the view's element. |
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423 | 453 | var elements = this.$el.find(selector); |
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424 | 454 | if (selector=='') { |
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425 | 455 | if (this.$el_to_style == undefined) { |
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426 | 456 | elements = this.$el; |
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427 | 457 | } else { |
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428 | 458 | elements = this.$el_to_style; |
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429 | 459 | } |
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430 | 460 | } |
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431 | 461 | return elements; |
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432 | 462 | }, |
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433 | 463 | }); |
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434 | 464 | |
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435 | 465 | |
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436 | 466 | //-------------------------------------------------------------------- |
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437 | 467 | // WidgetManager class |
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438 | 468 | //-------------------------------------------------------------------- |
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439 | 469 | var WidgetManager = function(){ |
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440 | 470 | this.comm_manager = null; |
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441 | 471 | this.widget_model_types = {}; |
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442 | 472 | this.widget_view_types = {}; |
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443 | 473 | |
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444 | 474 | var that = this; |
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445 | 475 | Backbone.sync = function(method, model, options, error) { |
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446 | 476 | var result = model._handle_sync(method, options); |
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447 | 477 | if (options.success) { |
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448 | 478 | options.success(result); |
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449 | 479 | } |
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450 | 480 | }; |
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451 | 481 | } |
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452 | 482 | |
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453 | 483 | |
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454 | 484 | WidgetManager.prototype.attach_comm_manager = function (comm_manager) { |
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455 | 485 | this.comm_manager = comm_manager; |
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456 | 486 | |
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457 | 487 | // Register already register widget model types with the comm manager. |
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458 | 488 | for (var widget_model_name in this.widget_model_types) { |
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459 | 489 | this.comm_manager.register_target(widget_model_name, $.proxy(this._handle_com_open, this)); |
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460 | 490 | } |
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461 | 491 | } |
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462 | 492 | |
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463 | 493 | |
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464 | 494 | WidgetManager.prototype.register_widget_model = function (widget_model_name, widget_model_type) { |
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465 | 495 | // Register the widget with the comm manager. Make sure to pass this object's context |
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466 | 496 | // in so `this` works in the call back. |
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467 | 497 | if (this.comm_manager!=null) { |
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468 | 498 | this.comm_manager.register_target(widget_model_name, $.proxy(this._handle_com_open, this)); |
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469 | 499 | } |
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470 | 500 | this.widget_model_types[widget_model_name] = widget_model_type; |
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471 | 501 | } |
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472 | 502 | |
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473 | 503 | |
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474 | 504 | WidgetManager.prototype.register_widget_view = function (widget_view_name, widget_view_type) { |
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475 | 505 | this.widget_view_types[widget_view_name] = widget_view_type; |
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476 | 506 | } |
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477 | 507 | |
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478 | 508 | |
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479 | 509 | WidgetManager.prototype.get_msg_cell = function (msg_id) { |
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480 | 510 | if (IPython.notebook != undefined && IPython.notebook != null) { |
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481 | 511 | return IPython.notebook.get_msg_cell(msg_id); |
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482 | 512 | } |
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483 | 513 | } |
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484 | 514 | |
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485 | 515 | |
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486 | 516 | WidgetManager.prototype.on_create_widget = function (callback) { |
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487 | 517 | this._create_widget_callback = callback; |
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488 | 518 | } |
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489 | 519 | |
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490 | 520 | |
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491 | 521 | WidgetManager.prototype._handle_create_widget = function (widget_model) { |
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492 | 522 | if (this._create_widget_callback) { |
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493 | 523 | try { |
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494 | 524 | this._create_widget_callback(widget_model); |
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495 | 525 | } catch (e) { |
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496 | 526 | console.log("Exception in WidgetManager callback", e, widget_model); |
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497 | 527 | } |
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498 | 528 | } |
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499 | 529 | } |
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500 | 530 | |
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501 | 531 | |
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502 | 532 | WidgetManager.prototype._handle_com_open = function (comm, msg) { |
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503 | 533 | var widget_type_name = msg.content.target_name; |
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504 | 534 | var widget_model = new this.widget_model_types[widget_type_name](this.comm_manager, comm, this); |
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505 | 535 | this._handle_create_widget(widget_model); |
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506 | 536 | } |
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507 | 537 | |
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508 | 538 | |
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509 | 539 | //-------------------------------------------------------------------- |
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510 | 540 | // Init code |
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511 | 541 | //-------------------------------------------------------------------- |
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512 | 542 | IPython.WidgetManager = WidgetManager; |
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513 | 543 | IPython.WidgetModel = WidgetModel; |
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514 | 544 | IPython.WidgetView = WidgetView; |
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515 | 545 | |
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516 | 546 | if (IPython.widget_manager==undefined || IPython.widget_manager==null) { |
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517 | 547 | IPython.widget_manager = new WidgetManager(); |
|
518 | 548 | } |
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519 | 549 | |
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520 | 550 | return IPython.widget_manager; |
|
521 | 551 | }); |
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