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Custom Layout manager measure() method

/ Published in: ActionScript 3
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  1. override public function measure():void {	
  2. 	if (!useVirtualLayout)
  3. 		return;
  4. 	var layoutTarget:GroupBase = target;
  5. 	if (!layoutTarget)
  6. 		return;
  7. 	var dataGroupTarget:DataGroup = layoutTarget as DataGroup;
  8. 	if (dataGroupTarget.width == 0 || dataGroupTarget.height == 0) {
  9. 		_containerWidth = _containerHeight = -1;
  10. 		return;
  11. 	}
  12.  
  13. 	var totalWidth:Number = 0;
  14. 	var totalHeight:Number = 0;
  15. 	var dataProvider:IList = dataGroupTarget.dataProvider;
  16. 	if (!dataProvider || !dataProvider.length)
  17. 		return;
  18. 	var count:int = dataProvider.length;
  19. 	var rowWidth:Number = dataGroupTarget.width;
  20. 	var sectionHeight:Number = _sectionHeight;
  21. 	var tileHeight:Number = _tileHeight;
  22. 	var tileWidth:Number = _columnWidth;
  23.  
  24. 	totalWidth = rowWidth;
  25.  
  26. 	var elementWidth:Number, elementHeight:Number;
  27. 	var x:Number = 0;
  28. 	yToIndex = new Vector.<int>();
  29. 	indexToY = new Vector.<int>();
  30. 	var d:Object = d = dataProvider.getItemAt(0);
  31. 	if (_sectionLabel in d) {
  32. 		addToVectorY(0, 0, sectionHeight);
  33. 		totalHeight = sectionHeight + _verticalGap;
  34. 	} else {
  35. 		addToVectorY(0, 0, tileHeight);
  36. 		totalHeight = tileHeight + _verticalGap;
  37. 	}
  38. 	//loop though all the elements elements
  39. 	for (var i:int = 0; i < count; i++) {
  40. 		d = dataProvider.getItemAt(i);
  41. 		if (!d) {
  42. 			elementWidth = tileWidth;
  43. 			elementHeight = tileHeight;
  44. 		} else if (_sectionLabel in d) {
  45. 			elementWidth = rowWidth;
  46. 			elementHeight = sectionHeight;
  47. 		} else {
  48. 			elementWidth = tileWidth;
  49. 			elementHeight = tileHeight;
  50. 		}
  51. 		// Would this element fit on this line, or should we move it
  52. 		// to the next line?
  53. 		if (x + elementWidth > rowWidth) {
  54. 			x = 0;
  55. 			//add the index to vector
  56. 			addToVectorY(i, totalHeight + 1, elementHeight);
  57. 			totalHeight += elementHeight + _verticalGap;
  58. 		}
  59. 		addToVectorIndex(i, totalHeight - elementHeight - _verticalGap);
  60. 		// Update the current position, add the gap
  61. 		x += elementWidth + _horizontalGap;
  62. 	}
  63. 	layoutTarget.measuredWidth = totalWidth;
  64. 	layoutTarget.measuredHeight = totalHeight;
  65. 	layoutTarget.measuredMinWidth = totalWidth;
  66. 	layoutTarget.measuredMinHeight = totalHeight; 
  67. 	layoutTarget.setContentSize(totalWidth, totalHeight);
  68. }

URL: http://corlan.org/?p=2987

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