qt-everywhere-src-5.14.1/qtconnectivity/examples/nfc/poster/poster.qml

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import QtQuick 2.3
import QtNfc 5.5

Rectangle {
    id: root
    width: 640
    height: 360

    NearField {
        id: nearfield
        property bool requiresManualPolling: false

        onPollingChanged: {
            if (!polling && requiresManualPolling)
                polling = true; //restart polling
        }

        Component.onCompleted: {
            if (!polling) {
                requiresManualPolling = true;
                polling = true;
            }
        }

        //! [QML NDEF filtering]
        filter: [
            NdefFilter { type: "U"; typeNameFormat: NdefRecord.NfcRtd; maximum: 1 },
            NdefFilter { type: "T"; typeNameFormat: NdefRecord.NfcRtd },
            NdefFilter { typeNameFormat: NdefRecord.Mime; minimum: 0; maximum: 1 }
        ]

        //! [QML NDEF filtering]

        //! [messageRecordsChanged 1]
        onMessageRecordsChanged: {
        //! [messageRecordsChanged 1]
            posterText.text = "";
            posterImage.source = "";
            posterUrl.text = "";

            var currentLocaleMatch = NdefTextRecord.LocaleMatchedNone;
            var i;
            var found = false;
        //! [messageRecordsChanged 2]
            for (i = 0; i < messageRecords.length; ++i) {
                switch (messageRecords[i].typeNameFormat) {
                case NdefRecord.NfcRtd:
                    if (messageRecords[i].type === "T") {
                        if (messageRecords[i].localeMatch > currentLocaleMatch) {
                            currentLocaleMatch = messageRecords[i].localeMatch;
                            posterText.text = messageRecords[i].text;
                            found = true;
                        }

                    } else if (messageRecords[i].type === "U") {
                         posterUrl.text = messageRecords[i].uri;
                        found = true;
                    }
                    break;
                case NdefRecord.Mime:
                    if (messageRecords[i].type.indexOf("image/") === 0 ) {
                        posterImage.source = messageRecords[i].uri;
                        found = true;
                    }
                    break;
                }

                if (!found)
                    console.warn("Unknown NFC tag detected. Cannot display content.")
            }
             //! [messageRecordsChanged 2]

            root.state = "show";
        //! [messageRecordsChanged 3]
        }
        //! [messageRecordsChanged 3]
    }

    Text {
        id: touchText
        anchors { horizontalCenter: parent.horizontalCenter; horizontalCenterOffset: parent.verticalCenter }
        text: "Touch an NFC tag with at least one Text and one URI record."
        font { italic: true; pointSize: 18 }
        wrapMode: Text.WordWrap
        width: root.width*0.75
        horizontalAlignment: Text.AlignHCenter
    }

    Image {
        id: posterImage
        scale: Image.PreserveAspectFit
        height:  parent.height * 0.8
        width: height * sourceSize.width / sourceSize.height
        anchors.verticalCenter: parent.verticalCenter
        x: -width
        smooth: true
    }

    Text {
        id: posterText
        y: -height
        anchors { horizontalCenter: parent.right; horizontalCenterOffset: - parent.width / 4 }
        font { italic: true; pointSize: 18 }
    }

    Text {
        id: posterUrl
        y: parent.height
        anchors { horizontalCenter: parent.right; horizontalCenterOffset: - parent.width / 4 }
        font { italic: true; pointSize: 14 }
    }

    MouseArea {
        id: openMouseArea
        anchors.fill: parent
        enabled: root.state == "show"
        onClicked: Qt.openUrlExternally(posterUrl.text)

        Rectangle {
            id: testTouch
            width: 50
            height: 50
            color: "lightsteelblue"
            opacity: 0.3
            anchors { top:  parent.top; right: close.left; rightMargin: 10 }
            MouseArea {
                id: touchMouseArea
                anchors.fill: parent
                onClicked: {
                    if (root.state == "") {
                        root.state = "show";
                    } else {
                        root.state = "";
                    }
                }
            }
        }

        Rectangle {
            id: close
            width: 50
            height: 50
            color: "black"
            radius: 0
            opacity: 0.3
            anchors { top: parent.top; topMargin: 0; right: parent.right; rightMargin: 0 }
            MouseArea {
                id: closeMouseArea
                anchors.fill: parent
                onClicked: Qt.quit();
            }
        }
    }

    states: State {
        name: "show"
        PropertyChanges { target: posterText; y: root.height / 3 }
        PropertyChanges { target: posterUrl; y: 2 * root.height / 3 }
        PropertyChanges { target: posterImage; x: root.width / 20 }
        PropertyChanges { target: touchText; opacity: 0 }
    }


    transitions: Transition {
        PropertyAnimation { easing.type: Easing.OutQuad; properties: "x,y" }
        PropertyAnimation { property: "opacity"; duration: 125 }
    }
}