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1 /////////////////////////////////////////////////////////////////////////////// |
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2 // RSS Reader from WRTKit examples, modified for Wikipedia widget |
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3 |
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4 // RSS reader class |
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5 |
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6 function RssReader(aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser){ |
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7 this.responseParser = aResponseParser; |
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8 this.feedUpdateBroker = null; |
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9 this.feedUpdateBrokerActive = false; |
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10 this.feedName = aFeedName; |
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11 this.feedURL = aFeedUrl; |
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12 this.feedUpdateForced = false; |
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13 this.feedItemControls = []; |
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14 this.feedLastModified = 0; |
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15 this.feedPresenter = aFeedPresenter; |
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16 this.ignoreContent = false; |
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17 this.hasData = false; |
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18 this.startFromItem = 0; |
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19 this.maxItems = 0; |
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20 this.feedPresenter = 0; |
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21 if ( aFeedName != undefined ) { |
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22 this.init(aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser); |
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23 } |
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24 } |
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25 |
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26 RssReader.prototype = new ListView(null, null); |
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27 |
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28 RssReader.prototype.init = function (aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser){ |
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29 this.previousView = aParent; |
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30 this.feedPresenter = aFeedPresenter; |
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31 this.responseParser = aResponseParser; |
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32 this.feedName = aFeedName; |
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33 this.feedURL = aFeedUrl; |
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34 if (aFeedPresenter != null) { |
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35 this.feedPresenter = aFeedPresenter; |
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36 this.feedPresenter.init(this); |
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37 } else { |
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38 this.feedPresenter = new HtmlFeedPresenter(this); |
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39 } |
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40 ListView.prototype.init.call(this, null, null); |
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41 |
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42 var caption = new NavigationButton(1, "titlebar.png", aFeedName, true); |
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43 caption.addEventListener("ActionPerformed", function(){wikiHomeView.show();}); |
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44 this.addControl(caption); |
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45 // add pre-amble items (latest posts, new thread, reply etc) |
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46 this.feedPresenter.addPreambleItems(); |
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47 } |
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48 |
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49 |
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50 // Callback function that gets called when a feed update has completed. |
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51 RssReader.prototype.feedUpdateCompleted = function(event){ |
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52 // remove cancel button |
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53 this.setupSoftKeys(); |
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54 if (event.status == "ok") { |
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55 // if there aren't any feed items yet, we'll hide the progress dialog |
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56 |
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57 // check if the feed has updated |
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58 if (event.lastModified != this.feedLastModified) { |
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59 // remember the last modified timestamp |
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60 this.feedLastModified = event.lastModified; |
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61 |
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62 // feed fetched and parsed successfully |
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63 this.setFeedItems(event.items); |
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64 this.feedPresenter.addFooterItems(); |
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65 this.focusFirst(); |
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66 } |
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67 uiManager.hideNotification(); |
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68 } |
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69 else if (event.status != "cancelled") { |
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70 // show error message |
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71 uiManager.showNotification(3000, "warning", "Error loading page!"); |
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72 } |
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73 |
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74 // reset the broker |
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75 this.feedUpdateBroker = null; |
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76 this.feedUpdateBrokerActive = false; |
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77 |
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78 // reset commanded feed update flag |
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79 this.feedUpdateForced = false; |
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80 } |
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81 |
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82 RssReader.prototype.focusFirst = function(){ |
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83 // focus the first feed item control |
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84 // (but only if we are in the main view) |
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85 if (this.feedItemControls.length > 0) { |
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86 this.feedItemControls[0].setFocused(true); |
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87 } |
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88 } |
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89 |
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90 // Removes feed items. |
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91 RssReader.prototype.removeFeedItems = function (){ |
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92 // remove all current feed items from the main view |
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93 for (var i = 0; i < this.feedItemControls.length; i++) { |
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94 this.removeControl(this.feedItemControls[i]); |
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95 } |
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96 |
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97 // reset feed item control array |
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98 this.feedItemControls = []; |
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99 } |
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100 |
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101 // Sets feed items. |
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102 RssReader.prototype.addFeedItemControl = function(c){ |
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103 this.feedItemControls.push(c); |
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104 this.addControl(c); |
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105 } |
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106 |
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107 // Sets feed items. |
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108 RssReader.prototype.setFeedItems = function (items){ |
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109 // start by removing all current feed items |
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110 this.removeFeedItems(); |
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111 |
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112 if (items.length == 0) { |
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113 this.feedPresenter.showNoItems(); |
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114 } |
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115 else { |
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116 // create new feed items and add them to the main view |
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117 // use feed item pool to recycle controls |
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118 for (var i = 0; i < items.length; i++) { |
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119 var item = items[i]; |
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120 this.feedPresenter.show(item); |
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121 } |
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122 |
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123 } |
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124 this.hasData = true; |
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125 } |
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126 |
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127 |
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128 // Update feed |
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129 RssReader.prototype.update = function(forceFeedUpdate, notification){ |
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130 if ( this.hasData && !forceFeedUpdate ) { |
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131 return; |
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132 } |
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133 this.feedUpdateForced = forceFeedUpdate; |
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134 |
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135 if ( notification == undefined ) { |
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136 notification = true; |
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137 } |
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138 |
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139 // check if a feed update has been scheduled, if it's time to update now, |
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140 // and if there's no update currently in progress and if we're in the main view |
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141 if ((this.feedURL != null) && (!this.feedUpdateBrokerActive) ) { //&& (uiManager.getView() == this) ) { |
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142 // fetch the feed from the specified URL |
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143 this.feedUpdateBrokerActive = true; |
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144 this.feedUpdateBroker = new FeedUpdateBroker(); |
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145 this.feedUpdateBroker.startFromItem = this.startFromItem; |
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146 this.feedUpdateBroker.maxItems = this.maxItems; |
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147 |
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148 if ( this.responseParser != null ) { |
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149 this.feedUpdateBroker.responseParser = this.responseParser; |
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150 } |
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151 this.feedUpdateBroker.ignoreContent = this.ignoreContent; |
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152 this.feedUpdateBroker.fetchFeed(this.feedURL, this); |
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153 // allow cancelling |
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154 if (window.widget) { |
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155 var self = this; |
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156 menu.setRightSoftkeyLabel("Cancel", function(){ |
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157 self.feedUpdateBroker.cancel(); self.setupSoftKeys(); |
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158 uiManager.hideNotification(); |
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159 }); |
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160 } |
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161 if (notification) { |
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162 uiManager.showNotification(-1, "wait", "Loading...", -1); |
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163 } |
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164 } |
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165 } |