ErrorDialog.qml Example File

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  import QtQuick 2.0

  Rectangle {
      id: root
      color: "transparent"
      opacity: 0.0
      property alias enabled: mouseArea.enabled
      property int dialogWidth: 300
      property int dialogHeight: 200
      state: enabled ? "on" : "baseState"

      states: [
          State {
              name: "on"
              PropertyChanges {
                  target: root
                  opacity: 1.0
              }
          }
      ]

      transitions: [
          Transition {
              from: "*"
              to: "*"
              NumberAnimation {
                  properties: "opacity"
                  easing.type: Easing.OutQuart
                  duration: 500
              }
          }
      ]

      Rectangle {
          anchors.fill: parent
          color: "black"
          opacity: 0.75
      }

      Rectangle {
          anchors.centerIn: parent
          width: dialogWidth
          height: dialogHeight
          radius: 5
          color: "white"

          Text {
              id: text
              anchors.fill: parent
              anchors.margins: 10
              horizontalAlignment: Text.AlignHCenter
              verticalAlignment: Text.AlignVCenter
              color: "black"
              wrapMode: Text.WordWrap
          }
      }

      MouseArea {
          id: mouseArea
          anchors.fill: parent
          onClicked: root.enabled = false
      }

      function show(msg) {
          text.text = "<b>Error</b><br><br>" + msg
          root.enabled = true
      }
  }