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: elementSpacing

          Rectangle {
              id: green
              color: "#80c342"
              width: 100 * ratio
              height: 100 * 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 * ratio
              height: 100 * 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 * ratio
              height: 100 * 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 * ratio
              height: 100 * 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)
          }
      }
  }