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Posted by psichron on Wed 2 Jul 23:57
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  1. // import Nevow.Athena
  2.  
  3. MyModule = {};
  4.  
  5. MyModule.MyWidget = Nevow.Athena.Widget.subclass('MyModule.MyWidget');
  6.  
  7. MyModule.MyWidget.methods(
  8.     function __init__(self,node) {
  9.         MyModule.MyWidget.upcall(self, '__init__', node);
  10.         self.fadeInItems = [];
  11.         self.fadeTimer = null;
  12.         self.fadeSteps = 50;
  13.         self.timeStep = 50;
  14.     },
  15.  
  16.     function serviceFadeInItems(self) {      
  17.         var newColorValue;
  18.  
  19.         if (self.fadeInItems.length == 0) {
  20.             clearInterval(self.fadeTimer); //Stop the fadeIn timer.
  21.             return;
  22.         }
  23.         for (var i=self.fadeInItems.length-1; i >= 0; i--) {
  24.             var item = self.fadeInItems[i][0];
  25.             var targetRGBvals = self.fadeInItems[i][1];      
  26.             var currentRGBvals = self.fadeInItems[i][2];
  27.             var RGBSteps = self.fadeInItems[i][3];
  28.        
  29.             for (var c=0; c < 3; c++) {            
  30.                 newColorValue = currentRGBvals[c] - RGBSteps[c];
  31.            
  32.                 if (newColorValue <= targetRGBvals[c]) {                
  33.                     currentRGBvals[c] = targetRGBvals[c];
  34.                 } else {              
  35.                     currentRGBvals[c] = Math.floor(newColorValue);
  36.                 }
  37.             }
  38.             if (currentRGBvals[0] == targetRGBvals[0]
  39.                     && currentRGBvals[1] == targetRGBvals[1]
  40.                     && currentRGBvals[2] == targetRGBvals[2])
  41.             {
  42.                 self.fadeInItems.splice(i,1);
  43.             }
  44.             item.style.backgroundColor = "rgb("+currentRGBvals.join(",")+")";
  45.         }    
  46.     },
  47.  
  48.     function fadeIn(self, item, targetRGBVals) {
  49.         var RGBSteps = [(255-targetRGBVals[0])/self.fadeSteps,(255-targetRGBVals[1])/self.fadeSteps,(255-targetRGBVals[2])/self.fadeSteps];
  50.         var newFadeItem = [item,targetRGBVals,[255,255,255],RGBSteps];
  51.         self.fadeInItems.push(newFadeItem); //item, targetColor, currentColor
  52.         if (self.fadeInItems.length == 1) //If this is the only item, start the timer.
  53.         {
  54.             self.fadeTimer = setInterval(function () {self.serviceFadeInItems()}, self.timeStep)            
  55.         }
  56.     },
  57.  
  58.        
  59.     function addRow(self, eventID) {
  60.         var table = self.nodeById('colorTableId');
  61.         var newRow = table.insertRow(-1);
  62.         newRow.insertCell(0).innerHTML = eventID;
  63.         self.fadeIn(newRow, [194,228,177]);
  64.         return eventID;
  65.     },
  66.  
  67.     function echo(self, argument) {
  68.         alert("Echoing " + argument);
  69.         return argument;
  70.     }
  71.  
  72.     );

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