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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(["widgets/js/manager", |
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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/namespace", |
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9 | 9 | ], function(widgetmanager, _, Backbone, $, IPython){ |
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10 | 10 | |
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11 | 11 | var WidgetModel = Backbone.Model.extend({ |
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12 | 12 | constructor: function (widget_manager, model_id, comm) { |
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13 | 13 | // Constructor |
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14 | 14 | // |
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15 | 15 | // Creates a WidgetModel instance. |
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16 | 16 | // |
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17 | 17 | // Parameters |
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18 | 18 | // ---------- |
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19 | 19 | // widget_manager : WidgetManager instance |
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20 | 20 | // model_id : string |
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21 | 21 | // An ID unique to this model. |
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22 | 22 | // comm : Comm instance (optional) |
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23 | 23 | this.widget_manager = widget_manager; |
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24 | 24 | this._buffered_state_diff = {}; |
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25 | 25 | this.pending_msgs = 0; |
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26 | 26 | this.msg_buffer = null; |
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27 |
this. |
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27 | this.state_lock = null; | |
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28 | 28 | this.id = model_id; |
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29 | 29 | this.views = []; |
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30 | 30 | |
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31 | 31 | if (comm !== undefined) { |
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32 | 32 | // Remember comm associated with the model. |
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33 | 33 | this.comm = comm; |
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34 | 34 | comm.model = this; |
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35 | 35 | |
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36 | 36 | // Hook comm messages up to model. |
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37 | 37 | comm.on_close($.proxy(this._handle_comm_closed, this)); |
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38 | 38 | comm.on_msg($.proxy(this._handle_comm_msg, this)); |
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39 | 39 | } |
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40 | 40 | return Backbone.Model.apply(this); |
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41 | 41 | }, |
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42 | 42 | |
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43 | 43 | send: function (content, callbacks) { |
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44 | 44 | // Send a custom msg over the comm. |
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45 | 45 | if (this.comm !== undefined) { |
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46 | 46 | var data = {method: 'custom', content: content}; |
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47 | 47 | this.comm.send(data, callbacks); |
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48 | 48 | this.pending_msgs++; |
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49 | 49 | } |
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50 | 50 | }, |
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51 | 51 | |
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52 | 52 | _handle_comm_closed: function (msg) { |
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53 | 53 | // Handle when a widget is closed. |
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54 | 54 | this.trigger('comm:close'); |
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55 | 55 | delete this.comm.model; // Delete ref so GC will collect widget model. |
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56 | 56 | delete this.comm; |
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57 | 57 | delete this.model_id; // Delete id from model so widget manager cleans up. |
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58 | 58 | _.each(this.views, function(view, i) { |
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59 | 59 | view.remove(); |
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60 | 60 | }); |
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61 | 61 | }, |
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62 | 62 | |
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63 | 63 | _handle_comm_msg: function (msg) { |
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64 | 64 | // Handle incoming comm msg. |
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65 | 65 | var method = msg.content.data.method; |
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66 | 66 | switch (method) { |
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67 | 67 | case 'update': |
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68 | 68 | this.apply_update(msg.content.data.state); |
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69 | 69 | break; |
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70 | 70 | case 'custom': |
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71 | 71 | this.trigger('msg:custom', msg.content.data.content); |
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72 | 72 | break; |
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73 | 73 | case 'display': |
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74 | 74 | this.widget_manager.display_view(msg, this); |
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75 | 75 | break; |
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76 | 76 | } |
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77 | 77 | }, |
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78 | 78 | |
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79 | 79 | apply_update: function (state) { |
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80 | 80 | // Handle when a widget is updated via the python side. |
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81 | var that = this; | |
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82 | _.each(state, function(value, key) { | |
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83 | that.key_value_lock = [key, value]; | |
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84 | try { | |
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85 |
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86 |
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87 | that.key_value_lock = null; | |
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88 |
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89 | }); | |
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81 | this.state_lock = state; | |
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82 | try { | |
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83 | var that = this; | |
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84 | WidgetModel.__super__.set.apply(this, [Object.keys(state).reduce(function(obj, key) { | |
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85 | obj[key] = that._unpack_models(state[key]); | |
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86 | return obj; | |
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87 | }, {})]); | |
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88 | } finally { | |
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89 | this.state_lock = null; | |
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90 | } | |
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90 | 91 | }, |
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91 | 92 | |
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92 | 93 | _handle_status: function (msg, callbacks) { |
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93 | 94 | // Handle status msgs. |
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94 | 95 | |
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95 | 96 | // execution_state : ('busy', 'idle', 'starting') |
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96 | 97 | if (this.comm !== undefined) { |
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97 | 98 | if (msg.content.execution_state ==='idle') { |
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98 | 99 | // Send buffer if this message caused another message to be |
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99 | 100 | // throttled. |
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100 | 101 | if (this.msg_buffer !== null && |
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101 | 102 | (this.get('msg_throttle') || 3) === this.pending_msgs) { |
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102 | 103 | var data = {method: 'backbone', sync_method: 'update', sync_data: this.msg_buffer}; |
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103 | 104 | this.comm.send(data, callbacks); |
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104 | 105 | this.msg_buffer = null; |
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105 | 106 | } else { |
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106 | 107 | --this.pending_msgs; |
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107 | 108 | } |
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108 | 109 | } |
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109 | 110 | } |
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110 | 111 | }, |
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111 | 112 | |
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112 | 113 | callbacks: function(view) { |
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113 | 114 | // Create msg callbacks for a comm msg. |
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114 | 115 | var callbacks = this.widget_manager.callbacks(view); |
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115 | 116 | |
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116 | 117 | if (callbacks.iopub === undefined) { |
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117 | 118 | callbacks.iopub = {}; |
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118 | 119 | } |
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119 | 120 | |
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120 | 121 | var that = this; |
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121 | 122 | callbacks.iopub.status = function (msg) { |
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122 | 123 | that._handle_status(msg, callbacks); |
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123 | 124 | }; |
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124 | 125 | return callbacks; |
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125 | 126 | }, |
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126 | 127 | |
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127 | 128 | set: function(key, val, options) { |
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128 | 129 | // Set a value. |
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129 | 130 | var return_value = WidgetModel.__super__.set.apply(this, arguments); |
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130 | 131 | |
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131 | 132 | // Backbone only remembers the diff of the most recent set() |
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132 | 133 | // operation. Calling set multiple times in a row results in a |
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133 | 134 | // loss of diff information. Here we keep our own running diff. |
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134 | 135 | this._buffered_state_diff = $.extend(this._buffered_state_diff, this.changedAttributes() || {}); |
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135 | 136 | return return_value; |
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136 | 137 | }, |
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137 | 138 | |
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138 | 139 | sync: function (method, model, options) { |
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139 | 140 | // Handle sync to the back-end. Called when a model.save() is called. |
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140 | 141 | |
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141 | 142 | // Make sure a comm exists. |
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142 | 143 | var error = options.error || function() { |
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143 | 144 | console.error('Backbone sync error:', arguments); |
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144 | 145 | }; |
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145 | 146 | if (this.comm === undefined) { |
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146 | 147 | error(); |
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147 | 148 | return false; |
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148 | 149 | } |
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149 | 150 | |
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150 | 151 | // Delete any key value pairs that the back-end already knows about. |
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151 | 152 | var attrs = (method === 'patch') ? options.attrs : model.toJSON(options); |
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152 |
if (this. |
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153 |
var key = this. |
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154 | var value = this.key_value_lock[1]; | |
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155 |
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156 |
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157 | } | |
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153 | if (this.state_lock !== null) { | |
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154 | var keys = Object.keys(this.state_lock); | |
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155 | for (var i=0; i<keys.length; i++) | |
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156 | var key = keys[i]; | |
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157 | if (attrs[key] === this.state_lock[key]) { | |
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158 | delete attrs[key]; | |
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159 | } | |
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158 | 160 | } |
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159 | 161 | |
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160 | 162 | // Only sync if there are attributes to send to the back-end. |
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161 | 163 | attrs = this._pack_models(attrs); |
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162 | 164 | if (_.size(attrs) > 0) { |
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163 | 165 | |
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164 | 166 | // If this message was sent via backbone itself, it will not |
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165 | 167 | // have any callbacks. It's important that we create callbacks |
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166 | 168 | // so we can listen for status messages, etc... |
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167 | 169 | var callbacks = options.callbacks || this.callbacks(); |
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168 | 170 | |
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169 | 171 | // Check throttle. |
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170 | 172 | if (this.pending_msgs >= (this.get('msg_throttle') || 3)) { |
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171 | 173 | // The throttle has been exceeded, buffer the current msg so |
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172 | 174 | // it can be sent once the kernel has finished processing |
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173 | 175 | // some of the existing messages. |
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174 | 176 | |
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175 | 177 | // Combine updates if it is a 'patch' sync, otherwise replace updates |
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176 | 178 | switch (method) { |
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177 | 179 | case 'patch': |
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178 | 180 | this.msg_buffer = $.extend(this.msg_buffer || {}, attrs); |
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179 | 181 | break; |
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180 | 182 | case 'update': |
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181 | 183 | case 'create': |
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182 | 184 | this.msg_buffer = attrs; |
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183 | 185 | break; |
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184 | 186 | default: |
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185 | 187 | error(); |
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186 | 188 | return false; |
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187 | 189 | } |
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188 | 190 | this.msg_buffer_callbacks = callbacks; |
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189 | 191 | |
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190 | 192 | } else { |
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191 | 193 | // We haven't exceeded the throttle, send the message like |
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192 | 194 | // normal. |
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193 | 195 | var data = {method: 'backbone', sync_data: attrs}; |
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194 | 196 | this.comm.send(data, callbacks); |
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195 | 197 | this.pending_msgs++; |
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196 | 198 | } |
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197 | 199 | } |
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198 | 200 | // Since the comm is a one-way communication, assume the message |
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199 | 201 | // arrived. Don't call success since we don't have a model back from the server |
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200 | 202 | // this means we miss out on the 'sync' event. |
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201 | 203 | this._buffered_state_diff = {}; |
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202 | 204 | }, |
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203 | 205 | |
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204 | 206 | save_changes: function(callbacks) { |
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205 | 207 | // Push this model's state to the back-end |
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206 | 208 | // |
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207 | 209 | // This invokes a Backbone.Sync. |
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208 | 210 | this.save(this._buffered_state_diff, {patch: true, callbacks: callbacks}); |
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209 | 211 | }, |
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210 | 212 | |
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211 | 213 | _pack_models: function(value) { |
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212 | 214 | // Replace models with model ids recursively. |
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213 | 215 | var that = this; |
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214 | 216 | var packed; |
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215 | 217 | if (value instanceof Backbone.Model) { |
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216 | 218 | return "IPY_MODEL_" + value.id; |
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217 | 219 | |
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218 | 220 | } else if ($.isArray(value)) { |
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219 | 221 | packed = []; |
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220 | 222 | _.each(value, function(sub_value, key) { |
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221 | 223 | packed.push(that._pack_models(sub_value)); |
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222 | 224 | }); |
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223 | 225 | return packed; |
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224 | 226 | |
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225 | 227 | } else if (value instanceof Object) { |
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226 | 228 | packed = {}; |
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227 | 229 | _.each(value, function(sub_value, key) { |
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228 | 230 | packed[key] = that._pack_models(sub_value); |
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229 | 231 | }); |
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230 | 232 | return packed; |
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231 | 233 | |
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232 | 234 | } else { |
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233 | 235 | return value; |
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234 | 236 | } |
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235 | 237 | }, |
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236 | 238 | |
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237 | 239 | _unpack_models: function(value) { |
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238 | 240 | // Replace model ids with models recursively. |
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239 | 241 | var that = this; |
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240 | 242 | var unpacked; |
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241 | 243 | if ($.isArray(value)) { |
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242 | 244 | unpacked = []; |
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243 | 245 | _.each(value, function(sub_value, key) { |
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244 | 246 | unpacked.push(that._unpack_models(sub_value)); |
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245 | 247 | }); |
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246 | 248 | return unpacked; |
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247 | 249 | |
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248 | 250 | } else if (value instanceof Object) { |
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249 | 251 | unpacked = {}; |
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250 | 252 | _.each(value, function(sub_value, key) { |
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251 | 253 | unpacked[key] = that._unpack_models(sub_value); |
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252 | 254 | }); |
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253 | 255 | return unpacked; |
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254 | 256 | |
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255 | 257 | } else if (typeof value === 'string' && value.slice(0,10) === "IPY_MODEL_") { |
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256 | 258 | var model = this.widget_manager.get_model(value.slice(10, value.length)); |
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257 | 259 | if (model) { |
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258 | 260 | return model; |
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259 | 261 | } else { |
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260 | 262 | return value; |
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261 | 263 | } |
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262 | 264 | } else { |
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263 | 265 | return value; |
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264 | 266 | } |
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265 | 267 | }, |
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266 | 268 | |
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267 | 269 | on_bulk_change: function(keys, callback, context) { |
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268 | 270 | this.on('change', function() { |
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269 | 271 | if (keys.some(this.hasChanged, this)) { |
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270 | 272 | callback.apply(context); |
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271 | 273 | } |
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272 | 274 | }, this); |
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273 | 275 | |
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274 | 276 | }, |
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275 | 277 | }); |
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276 | 278 | widgetmanager.WidgetManager.register_widget_model('WidgetModel', WidgetModel); |
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277 | 279 | |
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278 | 280 | |
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279 | 281 | var WidgetView = Backbone.View.extend({ |
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280 | 282 | initialize: function(parameters) { |
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281 | 283 | // Public constructor. |
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282 | 284 | this.model.on('change',this.update,this); |
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283 | 285 | this.options = parameters.options; |
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284 | 286 | this.child_model_views = {}; |
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285 | 287 | this.child_views = {}; |
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286 | 288 | this.model.views.push(this); |
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287 | 289 | this.id = this.id || IPython.utils.uuid(); |
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288 | 290 | this.on('displayed', function() { |
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289 | 291 | this.is_displayed = true; |
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290 | 292 | }, this); |
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291 | 293 | }, |
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292 | 294 | |
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293 | 295 | update: function(){ |
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294 | 296 | // Triggered on model change. |
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295 | 297 | // |
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296 | 298 | // Update view to be consistent with this.model |
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297 | 299 | }, |
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298 | 300 | |
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299 | 301 | create_child_view: function(child_model, options) { |
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300 | 302 | // Create and return a child view. |
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301 | 303 | // |
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302 | 304 | // -given a model and (optionally) a view name if the view name is |
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303 | 305 | // not given, it defaults to the model's default view attribute. |
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304 | 306 | |
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305 | 307 | // TODO: this is hacky, and makes the view depend on this cell attribute and widget manager behavior |
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306 | 308 | // it would be great to have the widget manager add the cell metadata |
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307 | 309 | // to the subview without having to add it here. |
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308 | 310 | options = $.extend({ parent: this }, options || {}); |
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309 | 311 | var child_view = this.model.widget_manager.create_view(child_model, options, this); |
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310 | 312 | |
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311 | 313 | // Associate the view id with the model id. |
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312 | 314 | if (this.child_model_views[child_model.id] === undefined) { |
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313 | 315 | this.child_model_views[child_model.id] = []; |
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314 | 316 | } |
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315 | 317 | this.child_model_views[child_model.id].push(child_view.id); |
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316 | 318 | |
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317 | 319 | // Remember the view by id. |
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318 | 320 | this.child_views[child_view.id] = child_view; |
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319 | 321 | return child_view; |
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320 | 322 | }, |
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321 | 323 | |
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322 | 324 | pop_child_view: function(child_model) { |
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323 | 325 | // Delete a child view that was previously created using create_child_view. |
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324 | 326 | var view_ids = this.child_model_views[child_model.id]; |
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325 | 327 | if (view_ids !== undefined) { |
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326 | 328 | |
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327 | 329 | // Only delete the first view in the list. |
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328 | 330 | var view_id = view_ids[0]; |
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329 | 331 | var view = this.child_views[view_id]; |
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330 | 332 | delete this.child_views[view_id]; |
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331 | 333 | view_ids.splice(0,1); |
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332 | 334 | child_model.views.pop(view); |
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333 | 335 | |
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334 | 336 | // Remove the view list specific to this model if it is empty. |
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335 | 337 | if (view_ids.length === 0) { |
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336 | 338 | delete this.child_model_views[child_model.id]; |
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337 | 339 | } |
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338 | 340 | return view; |
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339 | 341 | } |
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340 | 342 | return null; |
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341 | 343 | }, |
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342 | 344 | |
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343 | 345 | do_diff: function(old_list, new_list, removed_callback, added_callback) { |
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344 | 346 | // Difference a changed list and call remove and add callbacks for |
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345 | 347 | // each removed and added item in the new list. |
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346 | 348 | // |
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347 | 349 | // Parameters |
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348 | 350 | // ---------- |
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349 | 351 | // old_list : array |
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350 | 352 | // new_list : array |
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351 | 353 | // removed_callback : Callback(item) |
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352 | 354 | // Callback that is called for each item removed. |
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353 | 355 | // added_callback : Callback(item) |
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354 | 356 | // Callback that is called for each item added. |
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355 | 357 | |
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356 | 358 | // Walk the lists until an unequal entry is found. |
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357 | 359 | var i; |
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358 | 360 | for (i = 0; i < new_list.length; i++) { |
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359 | 361 | if (i >= old_list.length || new_list[i] !== old_list[i]) { |
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360 | 362 | break; |
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361 | 363 | } |
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362 | 364 | } |
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363 | 365 | |
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364 | 366 | // Remove the non-matching items from the old list. |
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365 | 367 | for (var j = i; j < old_list.length; j++) { |
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366 | 368 | removed_callback(old_list[j]); |
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367 | 369 | } |
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368 | 370 | |
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369 | 371 | // Add the rest of the new list items. |
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370 | 372 | for (; i < new_list.length; i++) { |
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371 | 373 | added_callback(new_list[i]); |
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372 | 374 | } |
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373 | 375 | }, |
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374 | 376 | |
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375 | 377 | callbacks: function(){ |
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376 | 378 | // Create msg callbacks for a comm msg. |
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377 | 379 | return this.model.callbacks(this); |
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378 | 380 | }, |
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379 | 381 | |
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380 | 382 | render: function(){ |
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381 | 383 | // Render the view. |
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382 | 384 | // |
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383 | 385 | // By default, this is only called the first time the view is created |
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384 | 386 | }, |
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385 | 387 | |
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386 | 388 | show: function(){ |
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387 | 389 | // Show the widget-area |
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388 | 390 | if (this.options && this.options.cell && |
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389 | 391 | this.options.cell.widget_area !== undefined) { |
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390 | 392 | this.options.cell.widget_area.show(); |
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391 | 393 | } |
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392 | 394 | }, |
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393 | 395 | |
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394 | 396 | send: function (content) { |
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395 | 397 | // Send a custom msg associated with this view. |
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396 | 398 | this.model.send(content, this.callbacks()); |
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397 | 399 | }, |
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398 | 400 | |
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399 | 401 | touch: function () { |
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400 | 402 | this.model.save_changes(this.callbacks()); |
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401 | 403 | }, |
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402 | 404 | |
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403 | 405 | after_displayed: function (callback, context) { |
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404 | 406 | // Calls the callback right away is the view is already displayed |
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405 | 407 | // otherwise, register the callback to the 'displayed' event. |
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406 | 408 | if (this.is_displayed) { |
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407 | 409 | callback.apply(context); |
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408 | 410 | } else { |
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409 | 411 | this.on('displayed', callback, context); |
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410 | 412 | } |
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411 | 413 | }, |
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412 | 414 | }); |
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413 | 415 | |
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414 | 416 | |
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415 | 417 | var DOMWidgetView = WidgetView.extend({ |
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416 | 418 | initialize: function (parameters) { |
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417 | 419 | // Public constructor |
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418 | 420 | DOMWidgetView.__super__.initialize.apply(this, [parameters]); |
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419 | 421 | this.on('displayed', this.show, this); |
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420 | 422 | this.after_displayed(function() { |
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421 | 423 | this.update_visible(this.model, this.model.get("visible")); |
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422 | 424 | this.update_css(this.model, this.model.get("_css")); |
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423 | 425 | }, this); |
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424 | 426 | this.model.on('msg:custom', this.on_msg, this); |
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425 | 427 | this.model.on('change:visible', this.update_visible, this); |
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426 | 428 | this.model.on('change:_css', this.update_css, this); |
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427 | 429 | }, |
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428 | 430 | |
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429 | 431 | on_msg: function(msg) { |
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430 | 432 | // Handle DOM specific msgs. |
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431 | 433 | switch(msg.msg_type) { |
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432 | 434 | case 'add_class': |
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433 | 435 | this.add_class(msg.selector, msg.class_list); |
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434 | 436 | break; |
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435 | 437 | case 'remove_class': |
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436 | 438 | this.remove_class(msg.selector, msg.class_list); |
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437 | 439 | break; |
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438 | 440 | } |
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439 | 441 | }, |
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440 | 442 | |
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441 | 443 | add_class: function (selector, class_list) { |
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442 | 444 | // Add a DOM class to an element. |
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443 | 445 | this._get_selector_element(selector).addClass(class_list); |
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444 | 446 | }, |
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445 | 447 | |
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446 | 448 | remove_class: function (selector, class_list) { |
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447 | 449 | // Remove a DOM class from an element. |
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448 | 450 | this._get_selector_element(selector).removeClass(class_list); |
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449 | 451 | }, |
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450 | 452 | |
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451 | 453 | update_visible: function(model, value) { |
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452 | 454 | // Update visibility |
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453 | 455 | this.$el.toggle(value); |
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454 | 456 | }, |
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455 | 457 | |
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456 | 458 | update_css: function (model, css) { |
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457 | 459 | // Update the css styling of this view. |
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458 | 460 | var e = this.$el; |
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459 | 461 | if (css === undefined) {return;} |
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460 | 462 | for (var i = 0; i < css.length; i++) { |
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461 | 463 | // Apply the css traits to all elements that match the selector. |
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462 | 464 | var selector = css[i][0]; |
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463 | 465 | var elements = this._get_selector_element(selector); |
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464 | 466 | if (elements.length > 0) { |
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465 | 467 | var trait_key = css[i][1]; |
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466 | 468 | var trait_value = css[i][2]; |
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467 | 469 | elements.css(trait_key ,trait_value); |
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468 | 470 | } |
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469 | 471 | } |
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470 | 472 | }, |
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471 | 473 | |
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472 | 474 | _get_selector_element: function (selector) { |
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473 | 475 | // Get the elements via the css selector. |
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474 | 476 | var elements; |
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475 | 477 | if (!selector) { |
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476 | 478 | elements = this.$el; |
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477 | 479 | } else { |
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478 | 480 | elements = this.$el.find(selector).addBack(selector); |
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479 | 481 | } |
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480 | 482 | return elements; |
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481 | 483 | }, |
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482 | 484 | }); |
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483 | 485 | |
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484 | 486 | var widget = { |
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485 | 487 | 'WidgetModel': WidgetModel, |
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486 | 488 | 'WidgetView': WidgetView, |
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487 | 489 | 'DOMWidgetView': DOMWidgetView, |
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488 | 490 | }; |
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489 | 491 | |
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490 | 492 | // For backwards compatability. |
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491 | 493 | $.extend(IPython, widget); |
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492 | 494 | |
|
493 | 495 | return widget; |
|
494 | 496 | }); |
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