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Custom Layout manager updateDisplayList() method - non virtual

/ Published in: ActionScript 3
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  1. private function updateNonVirtual(containerWidth:Number, containerHeight:Number):void {
  2. 	var layoutTarget:GroupBase = target;
  3. 	if (!(layoutTarget as DataGroup).dataProvider || (layoutTarget as DataGroup).dataProvider.length == 0)
  4. 		return;
  5.  
  6. 	if (!_containerWidth)
  7. 		_containerWidth = containerWidth;
  8. 	if (!_containerHeight)
  9. 		_containerHeight = containerHeight;
  10.  
  11. 	var x:Number = 0;
  12. 	var y:Number = 0;
  13. 	var maxWidth:Number = 0;
  14. 	var maxHeight:Number = 0;
  15. 	var elementWidth:Number, elementHeight:Number, prevElementHeight:Number;
  16.  
  17. 	//add some extra rows after the current view
  18. 	y = 0;
  19. 	var count:int = layoutTarget.numElements;
  20. 	var element:ILayoutElement;
  21.  
  22. 	for (var i:int = 0; i < count; i++) {
  23. 		// get the current element, we're going to work with the
  24. 		// ILayoutElement interface
  25. 		element = layoutTarget.getElementAt(i);
  26. 		// Resize the element to its preferred size by passing
  27. 		// NaN for the width and height constraints
  28. 		element.setLayoutBoundsSize(NaN, NaN);
  29. 		if (element["data"] && _sectionLabel in element["data"]) {
  30. 			elementWidth = containerWidth;
  31. 			elementHeight = _sectionHeight;
  32. 		} else {
  33. 			elementWidth = _columnWidth;
  34. 			elementHeight = _tileHeight;
  35. 		}				
  36. 		element.setLayoutBoundsSize(elementWidth, elementHeight);
  37.  
  38. 		// Would the element fit on this line, or should we move
  39. 		// to the next line?
  40. 		if (x + elementWidth > containerWidth) {
  41. 			x = 0;
  42. 			//move to the next row
  43. 			y += prevElementHeight + _verticalGap;
  44. 		}
  45. 		// Position the element
  46. 		element.setLayoutBoundsPosition(x, y);
  47. 		prevElementHeight = elementHeight;
  48. 		// Update the current position, add the gap
  49. 		x += elementWidth + _horizontalGap;
  50. 	}
  51. 	// Scrolling support - update the content size
  52. 	layoutTarget.setContentSize(containerWidth, y);
  53. }

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

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