- Qt 5.5
- Qt Quick
- Qt Quick Examples - Positioners
- positioners-attachedproperties.qml Example File
- Qt 5.5.1 Reference Documentation

# positioners-attachedproperties.qml Example File

positioners/positioners-attachedproperties.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    **
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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)
            }
        }
    }