Qt 5.9 | Qt NFC | QML Poster Example | poster.qml Example File

Qt 5.9.9 Reference Documentation

# poster.qml Example File

poster/poster.qml

      /****************************************************************************
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      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the QtNfc module of the Qt Toolkit.
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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;
                  }
              }

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

              onMessageRecordsChanged: {
                  posterText.text = "";
                  posterImage.source = "";
                  posterUrl.text = "";

                  var currentLocaleMatch = NdefTextRecord.LocaleMatchedNone;
                  var i;
                  var found = false;
                  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.")
                  }

                  root.state = "show";
              }
          }

          Text {
              id: touchText
              anchors.horizontalCenter: parent.horizontalCenter
              anchors.verticalCenter: parent.verticalCenter
              text: "Touch an NFC tag with at least one Text and one URI record."
              font.bold: true
              font.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
              anchors.horizontalCenter: parent.right
              anchors.horizontalCenterOffset: - parent.width / 4
              y: -height
              font.bold: true
              font.pointSize: 18
          }

          Text {
              id: posterUrl
              anchors.horizontalCenter: parent.right
              anchors.horizontalCenterOffset: - parent.width / 4
              y: parent.height
              font.italic: true
              font.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
                  anchors.right: close.left
                  anchors.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
                  anchors.topMargin: 0
                  anchors.right: parent.right
                  anchors.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 }
              }
          ]
      }