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
     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: 300
         height: 200
         radius: 10
         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
     }
 }