How to set an .xml file as datasource to Listview

[Mathan]

Hi,

I am writing an rexlog.xml will be the data source to Listview in main.qml. But, The listview is not showing the value. In the xml the values are written and it is accessable.

Query: I suspect, there will be performance issue, reading from .xml file and loading to Listview, Instead of that Is it good to load the data initially to QList or any similiar, so the listview can easily fetch the data for many events like scroll up/down.

Which option will be better? The xml entry can be atleast 80-100 set of data.

Code snippets:


main.qml
-----------

property string strXMLPath: System.userHomePath + "/rexlog.xml"  //.xml file stored in the c:\user\proile\rexlog.xml
 
 
    XmlListModel {
    id: idXMLListModel
    source: strXMLPath 
    query: "/catalog/book"
    XmlRole {name: "title"; query: "title/string()"}
 
XmlRole { name: "first_author"; query: "author[1]/string()" }
XmlRole { name: "year"; query: "year/number()" }
    }
 
 
    //Note: Add the click event for ListView
    ListView {
        anchors {
            left: parent.left
            leftMargin: 10 * scaleFactor
            right: parent.right
            rightMargin: 10 * scaleFactor
            top: rectangleToolBar.bottom
            topMargin: 10 * scaleFactor
            bottom: rectangleStatusBar.top
            bottomMargin: 10 * scaleFactor
        }
 
        model: idXMLListModel
        delegate: Column {
            Layout.alignment: Qt.AlignCenter
            Text { text: title + " (" + type + ")"; font.bold: wanted }
            Text { text: first_author }
            Text { text: year }
        }
    }
 
    Component {
        id: comsearchDelegate
 
        Row {
            spacing: 10 * scaleFactor
 
            Image {
                id: imageItem
                width: 100 * scaleFactor
                height: 70 * scaleFactor
                source: thumbnailUrl
            }
 
            Column {
                Layout.alignment: Qt.AlignTop
                Text { text: Title; font { pixelSize: 14  * scaleFactor; bold: true } }
 
            }
        }
    }

property string strXMLPath: System.userHomePath + "/rexlog.xml"  //.xml file stored in the c:\user\proile\rexlog.xml


    XmlListModel {
    id: idXMLListModel
    source: strXMLPath 
    query: "/catalog/book"
    XmlRole {name: "title"; query: "title/string()"}

XmlRole { name: "first_author"; query: "author[1]/string()" }
XmlRole { name: "year"; query: "year/number()" }
    }


    //Note: Add the click event for ListView
    ListView {
        anchors {
            left: parent.left
            leftMargin: 10 * scaleFactor
            right: parent.right
            rightMargin: 10 * scaleFactor
            top: rectangleToolBar.bottom
            topMargin: 10 * scaleFactor
            bottom: rectangleStatusBar.top
            bottomMargin: 10 * scaleFactor
        }

        model: idXMLListModel
        delegate: Column {
            Layout.alignment: Qt.AlignCenter
            Text { text: title + " (" + type + ")"; font.bold: wanted }
            Text { text: first_author }
            Text { text: year }
        }
    }

    Component {
        id: comsearchDelegate

        Row {
            spacing: 10 * scaleFactor

            Image {
                id: imageItem
                width: 100 * scaleFactor
                height: 70 * scaleFactor
                source: thumbnailUrl
            }

            Column {
                Layout.alignment: Qt.AlignTop
                Text { text: Title; font { pixelSize: 14  * scaleFactor; bold: true } }

            }
        }
    }

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.xml
-----

<?xml version="1.0" encoding="ISO-8859-1"?>
 
-<catalog>
 
 
-<book wanted="true" type="Online">
 
<title>Qt 5 Cadaques</title>
 
<year>2014</year>
 
<author>Juergen Bocklage-Ryannel</author>
 
<author>Johan Thelin</author>
 
</book>
 
 
-<book type="Hardcover">
 
<title>C++ GUI Programming with Qt 4</title>
 
<year>2006</year>
 
<author>Jasmin Blanchette</author>
 
<author>Mark Summerfield</author>
 
</book>
 
 
-<book type="Paperback">
 
<title>Programming with Qt</title>
 
<year>2002</year>
 
<author>Matthias Kalle Dalheimer</author>
 
</book>
 
</catalog>

<?xml version="1.0" encoding="ISO-8859-1"?>

-<catalog>


-<book wanted="true" type="Online">

<title>Qt 5 Cadaques</title>

<year>2014</year>

<author>Juergen Bocklage-Ryannel</author>

<author>Johan Thelin</author>

</book>


-<book type="Hardcover">

<title>C++ GUI Programming with Qt 4</title>

<year>2006</year>

<author>Jasmin Blanchette</author>

<author>Mark Summerfield</author>

</book>


-<book type="Paperback">

<title>Programming with Qt</title>

<year>2002</year>

<author>Matthias Kalle Dalheimer</author>

</book>

</catalog>

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