I finally figured it out. It only started working after I got my data from a QAbstractTableModel. I guess otherwise the rows were not redrawn.

In any case, here is what I ended up with:
Qt Code: 
  1. import QtQuick 2.4
  2. import QtQuick.Window 2.2
  3. import QtQuick.Controls 1.2
  4. import QtQuick.Controls.Styles 1.2
  5. import MoeFileModel 1.0
  6.  
  7. Window {
  8. 	visible: true
  9. 	width: 800
  10. 	height:600
  11.  
  12.  
  13. 	FileModelHandler {
  14. 		id: fileModelHandler
  15. 	}
  16.  
  17. 	TableView {
  18. 		id: tv
  19. 		anchors.fill: parent
  20. 		model: fileModelHandler
  21.  
  22. 		rowDelegate: Rectangle {
  23. 			property int sizeOpen: 60
  24. 			property int sizeClosed: 20
  25.  
  26. 			id: rowDelegate
  27. 			color:  styleData.alternate ? "#666666" : "#555555"
  28. 			height: getSize() // styleData.selected? sizeOpen : sizeClosed
  29.  
  30. 			function getSize()
  31. 			{
  32. 				if(!tv.selection.contains(styleData.row))
  33. 				{
  34. 					doClose.start();
  35. 					return sizeClosed;
  36. 				}
  37.  
  38. 				return sizeOpen;
  39. 			}
  40.  
  41. 			MouseArea {
  42. 				anchors.top: parent.top
  43. 				anchors.left: parent.left
  44. 				anchors.right: parent.right
  45. 				height: sizeClosed
  46. 				propagateComposedEvents: true
  47. 				preventStealing: true
  48. 				acceptedButtons: Qt.LeftButton | Qt.RightButton
  49.  
  50. 				onClicked: {
  51. 					if(rowDelegate.sizeOpen == rowDelegate.height)
  52. 					{
  53. 						tv.selection.deselect(styleData.row);
  54. 						doClose.start()
  55. 					}
  56. 					else
  57. 					{
  58. 						tv.selection.clear();
  59. 						tv.selection.select(styleData.row);
  60. 						doOpen.start();
  61. 					}
  62. 				}
  63. 			}
  64.  
  65. 			ParallelAnimation {
  66. 				id: doOpen
  67. 				running: false
  68. 				NumberAnimation { target: rowDelegate; easing.type: Easing.OutSine; property: "height"; to: sizeOpen; duration: 100 }
  69. 			}
  70. 			ParallelAnimation {
  71. 				id: doClose
  72. 				running: false
  73. 				NumberAnimation { target: rowDelegate; easing.type: Easing.OutSine; property: "height"; to: sizeClosed; duration: 100; }
  74. 			}
  75. 		}
  76.  
  77. 		// columns go here...
  78.                 TableViewColumn {}
  79. 	}
  80. }
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