- Qt 5.3
- Qt Quick
- Qt Quick Examples - Views
- highlightranges.qml Example File
- Qt 5.3.2 Reference Documentation

# highlightranges.qml Example File

views/listview/highlightranges.qml

    /****************************************************************************
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    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** 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
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    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    import QtQuick 2.0
    import "content"

    Rectangle {
        id: root
        property int current: 0
        property bool increasing: true
        // Example index automation for convenience, disabled on click or tap
        SequentialAnimation {
            id: anim
            loops: -1
            running: true
            ScriptAction {
                script: if (increasing) {
                            current++;
                            if (current >= aModel.count -1) {
                                current = aModel.count - 1;
                                increasing = !increasing;
                            }
                        } else {
                            current--;
                            if (current <= 0) {
                                current = 0;
                                increasing = !increasing;
                            }
                        }
            }

            PauseAnimation { duration: 500 }
        }
        MouseArea{
            id: ma
            z: 1
            anchors.fill: parent
            onClicked: { z = 1 - z; if (anim.running) anim.stop(); else anim.restart();}
        }

        width: 320; height: 480

        // This example shows the same model in three different ListView items,
        // with different highlight ranges. The highlight ranges are set by the
        // preferredHighlightBegin and preferredHighlightEnd properties in ListView.
        //
        // The first ListView does not set a highlight range, so its currentItem
        // can move freely within the visible area. If it moves outside the
        // visible area, the view is automatically scrolled to keep the current
        // item visible.
        //
        // The second ListView sets a highlight range which attempts to keep the
        // current item within the bounds of the range. However,
        // items will not scroll beyond the beginning or end of the view,
        // forcing the highlight to move outside the range at the ends.
        //
        // The third ListView sets the highlightRangeMode to StrictlyEnforceRange
        // and sets a range smaller than the height of an item.  This
        // forces the current item to change when the view is flicked,
        // since the highlight is unable to move.
        //
        // All ListViews bind their currentIndex to the root.current property.
        // The first ListView sets root.current whenever its currentIndex changes
        // due to keyboard interaction.
        // Flicking the third ListView with the mouse also changes root.current.
        ListView {
            id: list1
            height: 50; width: parent.width
            model: PetsModel {id: aModel}
            delegate: petDelegate
            orientation: ListView.Horizontal

            highlight: Rectangle { color: "lightsteelblue" }
            currentIndex: root.current
            onCurrentIndexChanged: root.current = currentIndex
            focus: true
        }

        ListView {
            id: list2
            y: 160
            height: 50; width: parent.width
            model: PetsModel {}
            delegate: petDelegate
            orientation: ListView.Horizontal

            highlight: Rectangle { color: "yellow" }
            currentIndex: root.current
            preferredHighlightBegin: 80; preferredHighlightEnd: 220
            highlightRangeMode: ListView.ApplyRange
        }

        ListView {
            id: list3
            y: 320
            height: 50; width: parent.width
            model: PetsModel {}
            delegate: petDelegate
            orientation: ListView.Horizontal

            highlight: Rectangle { color: "yellow" }
            currentIndex: root.current
            onCurrentIndexChanged: root.current = currentIndex
            preferredHighlightBegin: 125; preferredHighlightEnd: 125
            highlightRangeMode: ListView.StrictlyEnforceRange
        }
        // The delegate for each list
        Component {
            id: petDelegate
            Item {
                width: 160
                height: column.height
                Column {
                    id: column
                    Text { text: 'Name: ' + name }
                    Text { text: 'Type: ' + type }
                    Text { text: 'Age: ' + age }
                }

                MouseArea {
                    anchors.fill: parent
                    onClicked: root.current = index
                }
            }
        }
    }