positioners-attachedproperties.qml Example File

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 import QtQuick 2.0
 import QtQuick.Controls 1.1

 Rectangle {
     id: page

     property real ratio: width / 320 < height / 440 ? width / 320 : height / 440
     property int elementSpacing: 6.3 * ratio

     width: 320
     height: 440

     Button {
       anchors.top: parent.top
       anchors.right: parent.right
       anchors.margins: 10
       text: hidingRect.visible ? "Hide" : "Show"
       onClicked: hidingRect.visible = !hidingRect.visible
     }

     // Create column with four rectangles, the fourth one is hidden
     Column {
         id: column

         anchors.top: parent.top
         anchors.left: parent.left
         anchors.leftMargin: page.width / 32
         anchors.topMargin: page.height / 48
         spacing: page.elementSpacing

         Rectangle {
             id: green
             color: "#80c342"
             width: 100 * page.ratio
             height: 100 * page.ratio

             Text {
               anchors.left: parent.right
               anchors.leftMargin: 20
               anchors.verticalCenter: parent.verticalCenter
               text: "Index: " + parent.Positioner.index
               + (parent.Positioner.isFirstItem ? " (First)" : "")
               + (parent.Positioner.isLastItem ? " (Last)" : "")
             }

             // When mouse is clicked, display the values of the positioner
             MouseArea {
             anchors.fill: parent
             onClicked: column.showInfo(green.Positioner)
             }
         }

         Rectangle {
             id: blue
             color: "#14aaff"
             width: 100 * page.ratio
             height: 100 * page.ratio

             Text {
               anchors.left: parent.right
               anchors.leftMargin: 20
               anchors.verticalCenter: parent.verticalCenter
               text: "Index: " + parent.Positioner.index
               + (parent.Positioner.isFirstItem ? " (First)" : "")
               + (parent.Positioner.isLastItem ? " (Last)" : "")
             }

             // When mouse is clicked, display the values of the positioner
             MouseArea {
             anchors.fill: parent
             onClicked: column.showInfo(blue.Positioner)
             }
         }

         Rectangle {
             id: purple
             color: "#6400aa"
             width: 100 * page.ratio
             height: 100 * page.ratio

             Text {
               anchors.left: parent.right
               anchors.leftMargin: 20
               anchors.verticalCenter: parent.verticalCenter
               text: "Index: " + parent.Positioner.index
               + (parent.Positioner.isFirstItem ? " (First)" : "")
               + (parent.Positioner.isLastItem ? " (Last)" : "")
             }

             // When mouse is clicked, display the values of the positioner
             MouseArea {
             anchors.fill: parent
             onClicked: column.showInfo(purple.Positioner)
             }
         }

         // This rectangle is not visible, so it doesn't have a positioner value
         Rectangle {
             id: hidingRect
             color: "#006325"
             width: 100 * page.ratio
             height: 100 * page.ratio
             visible: false

             Text {
                 anchors.left: parent.right
                 anchors.leftMargin: 20
                 anchors.verticalCenter: parent.verticalCenter
                 text: "Index: " + parent.Positioner.index
                 + (parent.Positioner.isFirstItem ? " (First)" : "")
                 + (parent.Positioner.isLastItem ? " (Last)" : "")
             }
         }

         // Print the index of the child item in the positioner and convenience
         // properties showing if it's the first or last item.
         function showInfo(positioner) {
             console.log("Item Index = " + positioner.index)
             console.log("  isFirstItem = " + positioner.isFirstItem)
             console.log("  isLastItem = " + positioner.isLastItem)
         }
     }
 }